JPH082518B2 - Powder pressure molding method and molding apparatus - Google Patents

Description

Detailed Description of the Invention [Industrial applications]

The present invention relates to a powder pressure molding method and molding in which a powder packed in a powder packing space having a long axial length is pressure molded by a dry method from one longitudinal side of the powder filling space or both longitudinal sides opposite to each other. The present invention relates to an improvement of an apparatus, which relates to a technique of squeezing air in a powder to a place that does not adversely affect a molded product in the process of pressure molding. In addition, the powder is a concept including not only a completely dried state but also a wet state in which an appropriate amount of a liquid material such as a binder is contained.

[Prior art]

Conventionally, the powder filled in the powder filling space with a long axial length,
As shown in FIG. 31 and FIG. 32, the powder pressure molding device for pressure molding by the dry method from the opposite longitudinal sides of the powder filling space is made of a flexible material (for example, neoprene rubber, urethane resin). Etc.), and a mold 2 in which a powder filling space 1 having a long axial length is formed inside, lids 3 and 4 for covering the upper and lower open ends 1a, 1b of the powder filling space 1, and a mold 2 Flexible pressing strips 5 and 5 arranged so as to sandwich the opposing outer surfaces 2a and 2a of the mold, and the other outer surface 2b of the mold 2 while holding the pressing strips 5 and 5. A holding case 6 that holds 2b (see FIG. 32) is formed, and annular pressure chambers 8 and 8 are formed between the pressing strips 5 and 5 and the holding case 6. Holding case 6
The fluid supply / discharge ports 6c, 6d facing the respective pressure chambers 8 are opened at the respective positions. The holding case 6 is formed with a through hole 6a having a quadrangular cross section and penetrating in the vertical direction, and the pressing strips 5, 5 are arranged on the inner wall surface forming the through hole 6a.
Between the upper and lower lids 3 and 4, a cored bar 9 which vertically penetrates the center of the powder filling space 1 is detachably stretched. The core metal 9 has bolt portions 9a and 9b extending vertically, and the bolt portions 9a and 9b are inserted into the insertion holes 3a and 4a of the lids 3 and 4, and the nuts 10 are attached to the bolt portions 9a and 9b. , 11 are tightened. The mold 2 is inserted into the pressurizing strip 5 from the through hole 6a of the holding case 6 while being covered with the upper and lower lids 3 and 4, and is screwed into the upper and lower openings 6e and 6f of the holding case 6. It is held by the tightened fasteners 12 and 13. Next, the usage of the conventional powder pressure molding apparatus configured as described above will be described according to the work procedure. First, the upper fastener 12 screwed to the holding case 6 is removed, and the mold 2 is pulled out from the holding case 6. The upper nut 10 and the lid 3 arranged above the mold 2 are removed, and the powder 14 is filled in the powder filling space 1. The upper end of the powder filling space 1 filled with the powder 14 is covered with the lid 3, and the core metal 9
Tighten the nut 10 to the bolt portion 9a of. The mold 2 is inserted from the through hole 6a of the holding case 6 into the inside of the pressing strips 5, 5 and the fastener 12 is tightened in the opening 6e of the holding case 6 to complete the preparation before pressing. Next, the holding case 6 and the pressing strip 5,
In the pressure chambers 8 and 8 formed between the pressure chamber 7 and the pressure chamber 5, the pressurized fluid 7 (e.g.
Supply a liquid consisting of oil, glycerin, boric acid water, or a gas such as air). Although not shown, the flexible pressing strips 5, 5 press the substantially entire outer surfaces 2a, 2a of the mold 2 inward simultaneously with the supply of the pressurized fluid 7. The flexible mold 2 receives the pressing force from the pressing strips 5, 5 to reduce the outer dimension D of the mold and simultaneously apply the entire powder 14 in the powder filling space 1 at substantially the same time. Press. Powder 14
Since the air pressure inside the air increases as the pressure of the pressurized fluid 7 rises, it passes through the fine air passages formed by the particle gaps of the powder 14 toward the lids 3 and 4. , Core metal 9
It is discharged to the outside from the screwing gap between the bolt portions 9a, 9b and the nuts 10, 11. After pressurization for a predetermined time, the pressurized fluid 7 in the pressure chamber 8 is discharged from the fluid supply / discharge ports 6c, 6d. The flexible mold 2 and the pressing strips 5, 5 naturally return to the original mold outer diameter dimension D by their own elastic force as the pressurized fluid 7 is depressurized. Subsequently, the upper fastener 12 screwed to the holding case 6 is removed, and the mold 2 is pulled out from the holding case 6. Finally, the molded product (not shown) obtained inside the mold 2, the mold 2 and the cored bar 9 are separated.

[Problems to be Solved by the Invention]

As described above, the air present in the powder 14 is the pressurized fluid 7
As the air pressure increases as the pressure rises,
The powder passes through the continuous fine air passages in the powder 14 toward the lids 3 and 4, and is discharged to the outside from the gap between the bolts 9a and 9b of the cored bar 9 and the nuts 10 and 11. By the way, in order to quickly discharge the air intervening in the powder 14, it is necessary that the air pressure is high and the air passage formed by connecting the particle gaps of the powder 14 is large. In order to increase the air pressure, it is necessary to increase the pressure of the pressurized fluid 7. But,
The air passage formed by the continuous particle gaps of the powder 14 is in an extremely narrowed state or in a closed state as the powder 14 is pressurized. Thus, increasing the air pressure and enlarging the air passage are contradictory matters. The conventional powder pressure molding method and molding apparatus use the pressurized fluid 7
As a result, the entire molding pressure region of the mold 2 is pressed at substantially the same time, and the in-mold dimension D is reduced. As a result, in the conventional molding method and molding apparatus, the pressure increase of the air in the powder 14 and the decrease or clogging of the particle gap of the powder 14 simultaneously proceed over the entire powder filling space 1. Therefore, the above-mentioned trade-offs cannot be solved at all, and the following problems are brought about. That is, when the lengthwise dimension H of the powder filling space 1 is increased, the powder 14 filled in the central portion of the powder filling space 1 is formed by the bolt portions 9a and 9b of the core metal 9 and the nuts 10 and 11. Since the distance to the compressed air discharge gap becomes long, the compressed air in the high pressure state cannot be completely degassed, and the compressed air remains in the molded product.
The compressed air remaining in the molded product expands and damages the molded product when the pressurized fluid 7 is depressurized. Therefore, in the conventional molding method and molding apparatus, it is necessary to shorten the lengthwise dimension H of the powder filling space 1 to 500 mm or less in order to prevent compressed air from remaining, and it is possible to obtain a long molded product. could not.

[Purpose of the present invention]

In view of the above problems, an object of the present invention is to provide a powder pressure molding method and a molding apparatus capable of obtaining a long and high quality molded product without containing compressed air in the molded product.

[Means for solving problems]

In the powder pressure molding method according to the first aspect of the present invention, a powder is filled in a powder filling space having a long axial length formed on the pressure surface side of a flexible pressure band, In a method of press-molding powder by pressurizing the pressure-receiving surface of the body with a pressurizing fluid,
Time is applied to the pressure region of the pressure strip from the wall portion of the pressure strip corresponding to one part of the powder filling space to the wall portion of the pressure strip corresponding to the end of the powder filling space. The pressure is applied until the entire pressure receiving surface of the pressure band becomes a pressure region by sequentially increasing the pressure. The powder pressure molding apparatus according to the second aspect of the present invention includes a flexible pressure strip having a powder filling space having a long axial length formed on the pressure surface side, and a holding case for holding the pressure strip. In the powder pressure molding apparatus, the pressure receiving surface of the pressing strip is formed by a plurality of grooves formed by a plurality of recessed grooves which are provided at appropriate intervals in the axial direction of the pressing strip. One of the pressure areas is defined as a pressure area, and one pressure area selected from these pressure areas is used as an initial pressure area. An elastic sealing material is fitted in each of the concave grooves, and the holding case is attached to the holding case. A single pressurized fluid guide surface is formed in close contact with all of the elastic sealing material, and a pressurized fluid supply port is opened in a portion of the pressurized fluid guide surface facing the initial pressurized region. That is. The powder pressure molding apparatus according to the third aspect of the present invention includes a flexible pressure strip having a powder filling space having a long axial length formed on the pressure surface side, and a holding case for holding the pressure strip. In the powder pressure molding apparatus, the pressure band has an appropriate local portion located between both ends of the pressure band as an initial pressure region, and a wall structure of the pressure band. The elastic modulus of the material is made to increase continuously or stepwise from the initial pressure region toward the end of the pressure band, and the holding case has a pressure receiving surface of the pressure band and Opposed pressurized fluid guide surfaces are formed, and a pressurized fluid supply port is opened in a portion of the pressurized fluid guide surface facing the initial pressurized region of the pressurized strip. The powder pressure molding apparatus according to the fourth aspect of the present invention includes a flexible pressing strip having a powder filling space having a long axial length formed on the pressing surface side, and a holding case for holding the pressing strip. In the powder pressure molding apparatus, the pressure receiving surface of the pressing strip is defined by a plurality of recessed grooves which are recessed from each other at appropriate intervals in the axial direction of the pressing strip. A plurality of pressure areas are formed,
One pressurizing area selected from these pressurizing areas is set as an initial pressurizing area, an elastic sealing material is fitted in the husband of the groove, and the holding case is provided with the elastic sealing material. One pressurizing fluid guide surface is formed that is in close contact with all
A pressurizing fluid supply port is opened at a portion of the pressurizing fluid guide surface facing the initial pressurizing region, and a flexible back-up strip is disposed on the pressurizing surface side of the pressurizing strip. , The elastic coefficient of the wall constituting material of the back-up strip is increased from the region corresponding to the initial pressurizing region formed in the pressurizing strip toward the wall portion corresponding to the end of the powder filling space. ,
That is, the size is increased stepwise or continuously.

[Work]

(First First Invention) The operation of the powder pressure molding method according to the first invention will be described with reference to FIGS. 1 to 5 showing an embodiment thereof. Third
As shown in FIG. (A), the pressurized fluid 7 flows from the pressurized fluid supply port 33c of the holding case 36 between the pressure receiving surface 25a of the pressing band 25 and the pressurized fluid guide surface 36f of the holding case 36. Supplied. The pressurized fluid 7 is initially applied to a portion of the pressure receiving surface 25a of the pressure belt 25 that faces the pressurized fluid supply port 33c, and the initial pressurized region 25a-
1 is formed, and the initial pressing area 25a-1 of the pressing strip 25 is expanded and deformed inward. The powder 14 in the powder filling space 1 is pressurized only in a region corresponding to the initial pressure region 25a-1 of the pressure belt 25. Air in pressurized powder 14 (not shown)
Since the air pressure increases as the powder 14 is pressed, it rapidly flows into the air passage formed by the particle gap in the unpressurized powder, and It does not remain in the compressed state. As the supply amount increases, the pressurized fluid 7 flows out to a sequential pressurizing region adjacent to the initial pressurizing region 25a-1 of the pressurizing strip 25, as shown in FIG. The expansion and deformation of the next pressurization region will be gradually expanded. The powder 14 filled in the powder filling space 1 faces the initial pressure region 25a- of the pressure band 25 and the powder filling space 1
Initial pressure is gradually applied from the inner region toward the ends 1a and 1b (see FIG. 1). The air present in the powder 14 filled in the powder filling space 1 is a powder that faces the initial pressurizing region 25a-1 of the pressurizing band 25 as the powder 14 is sequentially pressed. It is squeezed from the region in the filling space 1 toward the ends 1a, 1b. As a result, in the initially pressed powder 14,
There is no residual compressed air that could damage 34 (see Figure 5). (Second Present Invention) The operation of the powder pressure molding apparatus according to the second invention will be described with reference to FIGS. 7 to 12 showing the embodiment. 10th
As shown in FIG. 3A, the pressurized fluid 7 is applied from the pressurized fluid supply port 33c of the holding case 36 to the initial pressure area 225a-1 on the pressure receiving surface 225a of the pressure strip 225 and the holding case 36. It is supplied between the fluid guide surface 36f. Pressurizing areas 225a-2 and 225a-3 adjacent to the initial pressurizing area 225a-1 and the initial pressurizing area 225a-
1 is partitioned by the elastic sealants 235, 235, the pressurized fluid 7 first presses only the initial pressurization region 225a-1, so that the initial pressurization region 225a-1 of the pressurizing strip 225 is directed inward. Inflate and deform. The powder 14 in the powder filling space 1 is the pressure strip 22.
Only the area facing the initial pressure area 225a-1 of 5 is pressurized. The air (not shown) in the pressurized powder 14 rapidly flows out into the air passage formed by the particle gap in the unpressurized powder because the air pressure rises, and the pressure is increased. It does not remain in the compressed powder 14 in a compressed state. Pressurized strip as the total supply of pressurized fluid 7 increases
When the amount of bending of 225 becomes large, in the pressing strip 225, the portions of the concave grooves 225b, 225b formed in the upper and lower sides of the initial pressing region 225a-1 are deformed inward. The elastic sealing materials 235, 235 fitted in the grooves 225b, 225b are, as shown in FIG.
Along with the inward deformation of 225b, a gap is formed between the holding case 36 and the pressurized fluid guide surface 36f to release the sealing function. With the release of the sealing function of the elastic sealing materials 225 and 235, the pressurized fluid 7 is applied to the initial pressure region 225a of the pressure belt 225.
-1 flows out into the pressure areas 225a-2 and 225a-3 adjacent to -1, and presses the pressure areas 225a-2 and 225a-3. The powder 14 in the powder filling space 1 is the pressure area 225a-2,225a of the pressure band 225.
The area opposite -3 is pressurized. The air (not shown) in the pressurized powder 14 rapidly flows out into the air passage in the unpressurized powder because the air pressure rises, and It does not remain in the compressed state. When the total supply amount of the pressurized fluid 7 further increases, the pressurized fluid 7 becomes
As shown in FIG. 11, the pressurizing regions 225a-4, 225a-5 and the pressurizing regions 225a-6, 225a- on the pressure receiving surface 225a of the pressurizing band 225 are shown.
7 is sequentially pressurized as described above. The powder 14 filled in the powder filling space 1 as the pressure strip 225 is sequentially pressed.
Are sequentially pressurized from the region in the powder filling space 1 facing the initial pressure region 225a-1 of the pressure band 225 toward the ends 1a, 1b. The air present in the powder 14 filled in the powder filling space 1 is compressed by the pressure of the powder 14 in sequence.
Powder filling space 1 facing the initial pressure area 225a-1 of 225
The area is narrowed toward the ends 1a and 1b. As a result, compressed air that would damage the molded product 234 (see FIG. 12) does not remain in the pressed powder 14. (Third Invention of the Present Invention) The operation of the powder pressure molding apparatus according to the third invention of the present invention will be described based on FIGS. 13 to 17 showing an embodiment thereof. 15th
As shown in FIG. 3A, the pressurized fluid 7 is applied from the pressurized fluid supply port 33c of the holding case 36 to the initial pressure area 325-1 of the pressure receiving surface 325a of the pressing strip 325 and the holding case 36. It is supplied between the fluid guide surface 36f. The pressurizing fluid 7 first presses only the initial pressurizing region 325-1 and expands and deforms only the initial pressurizing region 325-1 of the pressurizing strip 325 inward. The reason is that the elastic modulus of the initial pressing area 325-1 is equal to the pressing area 325-2,
This is because the initial pressure area 325-1 is easily deformed because it is smaller than the elastic modulus of 325-3. The powder 14 in the powder filling space 1 is the initial pressing area 325-1 of the pressing strip 325.
Only the area opposite to is pressurized. The air (not shown) in the pressurized powder 14 rapidly flows out into the air passage formed by the particle gap in the unpressurized powder because the air pressure rises, and the pressure is increased. It does not remain in the compressed powder 14 in a compressed state. The pressurizing fluid 7 increases in pressure as the supply pressure increases.
It flows out between 5-3 and the pressurized fluid guide surface 36f of the holding case 36, and the pressurized regions 325-2 and 325-3 are inflated and deformed inward. The powder 14 in the powder filling space 1 is pressed in a region of the pressure strip 325 that faces the pressure regions 325-2 and 325-3. The air (not shown) in the pressurized powder 14 rapidly flows out into the air passage in the unpressurized powder because the air pressure rises, and It does not remain in the compressed state. It should be noted that the pressure of the pressurized fluid 7 is the pressure band 325.
In the case of pressurizing only the initial pressurizing area 325-1, the case of pressurizing the pressurizing areas 325-2 and 325-3 is increased. Due to the phenomenon of increase in pressing force, the initial pressing area 325 of the pressing strip 325
The powder 14 initially pressurized in the area inside the powder filling space 1 facing -1 is further pressurized. This phenomenon of increasing the pressing force also discharges a small amount of compressed air remaining in the powder 14 that has been initially pressurized, and completes the degassing of the compressed air. When the supply pressure of the pressurized fluid 7 is further increased, the pressurized fluid 7 is, as shown in FIG.
pressure area 325-4, 325-5 and pressure area 325-6 in a
325-7 is sequentially pressurized as above. The powder filled in the powder filling space 1 as the pressing band 325 is sequentially pressed.
14 is sequentially pressed from the area in the powder filling space 1 facing the initial pressing area 325-1 of the pressing strip 325 toward the ends 1a, 1b. The air present in the powder 14 filled in the powder filling space 1 is compressed by the pressure of the powder 14 in sequence.
From the region in the powder filling space 1 facing the initial pressurizing region 325-1 of 325, the powder is squeezed toward the ends 1a and 1b. As a result, compressed air that would damage the molded product 339 (see FIG. 17) does not remain in the pressed powder 14. (Fourth Invention) The operation of the powder pressure molding apparatus according to the fourth invention will be described with reference to FIGS. 18 to 23 showing the embodiment. 21st
As shown in FIG. 3A, the pressurized fluid 7 is applied from the pressurized fluid supply port 33c of the holding case 36 to the initial pressure area 225a-1 on the pressure receiving surface 225a of the pressure strip 225 and the holding case 36. It is supplied between the fluid guide surface 36f. Pressurizing areas 225a-2 and 225a-3 adjacent to the initial pressurizing area 225a-1 and the initial pressurizing area 225a-
1 is partitioned by the elastic sealants 235, 235, the pressurized fluid 7 first presses only the initial pressurization region 225a-1, so that the initial pressurization region 225a-1 of the pressurizing strip 225 is directed inward. Inflate and deform. The powder 14 in the powder filling space 1 is the pressure strip 22.
Only the area facing the initial pressure area 225a-1 of 5 is pressurized. The air (not shown) in the pressurized powder 14 rapidly flows out into the air passage formed by the particle gap in the unpressurized powder because the air pressure rises, and the air is pressurized. It does not remain in the powder 14 in a compressed state. When the amount of deflection of the pressurizing strip 225 and the back-up strip 457 increases as the total supply amount of the pressurizing fluid 7 increases, the pressurizing strip 2
In the case of 25, the annular recessed grooves 225b, 225b recessed on both sides of the initial pressure area 225a-1 are deformed inward. The elastic sealing members 235, 235 fitted in the recessed grooves 225b, 225b are, as shown in FIG. 6B, the pressurized fluid guide surfaces of the holding case 36 as the recessed grooves 225b, 225b are deformed inward. A seal is formed by forming a gap with 36f. With the release of the sealing function of the elastic sealing materials 235, 235, the pressurized fluid 7 is applied to the pressurized regions 225a-2, 225a adjacent to the initial pressurized region 225a-1 of the pressurized strip 225.
-3, and presses the pressure areas 225a-2, 225a-3. The powder 14 in the powder filling space 1 is pressed in a region of the pressing strip 225 that faces the pressing regions 225a-2 and 225a-3. The air (not shown) in the pressurized powder 14 rapidly flows out into the air passage in the unpressurized powder because the air pressure rises, and It does not remain in the compressed state. The pressure of the pressurized fluid 7 is the pressure band 22.
The case where the pressure areas 225a-2 and 225a-3 are pressurized is larger than the case where only the initial pressure area 225a-1 of 5 is pressurized. The reason is that the elastic coefficient of the back-up strip 457 is
This is because the pressure band 225 becomes larger as it goes from the region facing the initial pressure region 225a-1 toward the ends 1a, 1b (see FIG. 18) of the powder filling space 1. Due to the phenomenon of increase in the pressing force, the powder 14 pressed in the area in the powder filling space 1 facing the initial pressing area 225a-1 of the pressing strip 225 is
Further pressure is applied. This phenomenon of increasing the pressing force also discharges a small amount of compressed air remaining in the powder 14 that has been initially pressurized, and completes the degassing of the compressed air. When the supply pressure of the pressurized fluid 7 is further increased, the pressurized fluid 7 is
As shown in the figure, the pressure areas 225a-4, 225a-5 and the pressure areas 225a-6, 225a-7 on the pressure receiving surface 225a of the pressure band 225 are sequentially pressurized. The powder 14 filled in the powder filling space 1 faces the initial pressurizing region 225a-1 of the pressing strip 225 as the pressing strip 225 and the back-up strip 457 are sequentially pressed. Pressure is sequentially applied from the region in the powder filling space 1 toward the ends 1a and 1b. The powder filled in the powder filling space 1
As the powder 14 is sequentially pressurized, the air present in the powder 14 flows from the region of the pressure band 225 facing the initial pressure region 225a-1 toward the end portions 1a, 1b of the powder filling space 1. Be narrowed down.
As a result, the molded product 459 (No. 23
There is no residual compressed air that could damage the (see figure).

[Explanation of the embodiment]

Next, the powder pressure molding method according to the present invention (hereinafter, "
And the powder pressure molding apparatus according to the present invention.
(Hereinafter, referred to as "the device of the present invention")
It will be explained based on. (First Embodiment) FIGS. 1 to 5 are diagrams for carrying out the method of the present invention.
1 shows a powder pressure molding apparatus 20 of one embodiment. Real
The powder pressure molding device 20 of the embodiment includes a pressure-applied tool 21 and a pressurization tool 22.
Consists of Pressurized tool 21 has the same structure as the conventional one, and
The long powder filling space 1 is formed inside and
A flexible mold 2 having a quadrangular outer shape,
Lids 3,4 for covering the upper and lower open ends 1a, 1b of the powder filling space 1
And a cored bar 9 stretched between the upper and lower lids 3 and 4, and a cored bar 9
Nuts 10 and 11 screwed to the bolt portions 9a and 9b. core
Gold 9 has a circular cross section, an elliptical shape, a polygonal shape, or the like.
Is formed into an appropriate shape, and one or more are stretched.
You. When obtaining a solid molded product, the core metal 9 should be
It is not suspended in field 2. Improvements in the powder pressure molding device 20 of the present embodiment
Is a pressure tool 22. The pressure tool 22 is inside the holding case 36.
In addition, the two pressing strips 25, 25 are arranged to face each other. Retention
The case 36 is attached to the rigid outer cylinder 33 and the upper and lower ends of the outer cylinder 33.
And the upper and lower lids 28 and 29 for holding the pressing strip 25 from above and below.
Consists of The pressure band 25 is made of a flexible material (for example, neoprene).
Made of ren rubber, urethane resin, etc.)
And its hardness is properly selected within the range of JIS rubber hardness 40 to 90 degrees.
To be done. The outer surface 25a of each pressurizing strip 25 has a pressure of the pressurizing fluid 7.
The pressure receiving surface that receives force, and the end portions 1a, 1 of the powder filling space 1
The pressure area farthest from b is the initial pressure area 25a-1 (the third area).
(See FIGS. (A) and (B)). Retention
The case 36 has, on its inner surface, pressure-receiving surfaces 25a, 25a of the pressurizing strips 25, 25.
Pressurized fluid guide surfaces 36f, 36f that come into close contact are formed.
You. Each pressurizing fluid guide surface 36f has an initial portion of the pressurizing strip 25.
The pressurized fluid supply port 33c facing the pressurized region 25a-1 is opened.
Have been. Above the respective pressurized fluid guide surfaces 36f,
Position facing the lid 3 of the tool 21 to be pressed via the pressing strip 25
The pressurized fluid supply / discharge port 33a is opened. Also each
Below the pressurizing fluid guide surface 36f, the pressurizing strip 25 is interposed.
The pressurizing fluid 21 at the position facing the lid 4 of the pressurized tool 21.
The mouth 33b is opened. Upper and lower pressurized fluid supply / discharge ports 33a and
33b is a pressurizing fluid guide surface 36f of the holding case 36 and the pressurizing strip 25
If necessary, to discharge the air that is present between
The pressure receiving surface 25 of the pressure belt 25 that is usually provided
It is blocked by a. Closed pressurized fluid supply / discharge ports 33a and 33b
The parts 25c and 25d of the pressing strip 25 are the lids 3 and 4 of the tool 21 to be pressed.
Since it is backed up with, these parts 25c and 25d are
The closed state is maintained until it is shaped (see FIG. 4). The initial stage formed on the pressure receiving surface 25a of the pressure strip 25
The pressure area 25a-1 is limited to the center as in the illustrated embodiment.
Although not shown, the three-dimensional object to be molded is not shown.
Depending on the shape, the upper end 25e and the lower end 2 of each pressure strip 25
Of course it is also possible to select an appropriate local part located between 5f
It is possible. The powder pressure molding apparatus 20 of the present embodiment has the same structure as the illustrated embodiment.
And the long axis of the powder filling space 1 is aligned vertically.
However, it is not limited to this, and the illustration is omitted.
However, the long axis of the powder filling space 1 is inclined or water.
Of course, it may be flat, and the pressurized fluid 7 is added to the powder pressure molding apparatus 20 of this embodiment.
A pressurized liquid supply / discharge device 40 for supplying / discharging pressurized liquid is based on FIG.
Will be explained. Initial pressurizing pump 41 and booth pump 42
Has a suction port 41a, 42a facing the tank 43. Initial addition
The discharge port 41b of the pressure pump 41 is connected to the check valve 44 and
Pressurized fluid supply / discharge port 33c of the outer cylinder 33 via the Renoid valve 45,
Connected to 33c. Discharge of pump 41 for initial pressurization
Between the opening 41b and the check valve 44, the pressure switch 46
And a relief valve 47 is connected and connected. For booth
The outlet 42b of the pump 42 is connected to the inlet 4 of the boost cylinder 48.
8a and the relief valve 50 are connected and piped. booth
The outlet 48b of the cylinder 48 is connected via the check valve 51.
Connected to the solenoid valve 45. Boo
Between the discharge port 48b of the strike cylinder 48 and the check valve 51
A pressure switch 52 is connected to the pipe. Initial pressurization
Times to start and stop the pump 41 and booth pump 42
Path 53 detects pressure set by pressure switch 46 for initial pressure setting.
Only the initial pressurizing pump 41 is started until the signal is output.
The set pressure detection signal output by the pressure switch 46.
Stop the initial pressurizing pump 41 when
Start the pump 42. Furthermore, the operation circuit 53 is set to high voltage.
Until the pressure switch 52 for output the setting detection signal.
Start the pump 42 for the pressure switch and output the pressure switch 52.
When receiving the constant pressure detection signal, stop the booth pump 42
Let it. The drain pipe 63 leading to the tank 43 is a solenoid
Pressurized fluid supply / discharge ports 33b, 33b of the outer cylinder 33 via the id valve 54.
Connected via solenoid valves 55 and 56.
Connected to the pressurized fluid supply / discharge ports 33a, 33a of the outer cylinder 33.
You. A liquid level detection switch 57 is arranged in the tank 43.
You. The drainage device 64 includes the pressurized fluid guide surfaces 36f, 36f of the outer cylinder 33.
Between the pressure receiving surface 25a and 25a of the pressure belt 25, 25
Is for forcibly discharging the pressurized fluid 7 made of liquid.
You. The outlet 58a of the pressurized air supply source 58 is a solenoid valve.
Between the solenoid valves 55 and 56 via the valves 59 and 60.
It is connected. Between the solenoid valves 59 and 60,
Silencer 62 is connected via solenoid valve 61
ing. The silencer 62 discharges the pressurized fluid 7.
The discharge port to communicate with the tank 43.
Is preferred. Next, an example of the method of the present invention is used in the powder pressure molding apparatus 20.
The procedure will be described below. First, the powder 14 is filled.
The pressurizing tool 21 is loaded inside the outer cylinder 33. Pressurized liquid supply / drainage device
40 closes solenoid valves 54, 55, 56 and
Open the noid valve 45. The initial pressurizing pump 41 is operated
Activated by the output signal of path 53 to
Predetermined pressure on the mouth 33c, 33c (for example, 50 to 200 kg / cm ² ) Pressurization
The fluid 7 is supplied. The pressurized fluid 7 receives the pressurized strips 25, 25.
The pressure surfaces 25a, 25a and the pressurized fluid guide surfaces 36f, 36f of the holding case 36
The powder filled in the powder filling space 1
14 is the initial pressing area 25a-1, 25a-1 of the pressing strips 25, 25.
From the area inside the powder filling space 1 facing (see FIG. 3)
Sequential pressure is applied so that the ends 1a and 1b are squeezed. powder
The air in the body 14 is pressurized in this order so that the powder filling space 1
The bolts 9a, 9b of the core metal 9 are squeezed to the inner ends 1a, 1b.
Is discharged to the outside through the screwing gap between the nuts 10 and 11. So
As a result, the molded product 34 (see FIG.
There is no residual compressed air that could damage the
No. The discharge pressure of the initial pressurizing pump 41 is the same as that of the entire powder 14.
It rises when the initial pressurization is completed. The pressure switch 46
The set pressure detection signal is operated as the discharge pressure rises.
Output to the path 53, stop the initial pressurizing pump 41,
The booth pump 42 is started. The booth pump 42 is
High pressure (for example, 500 to 5,000 kg / cm ² ) Pressurized fluid 7
Pressurized fluid in the pressure receiving surfaces 25a, 25a of the pressure strips 25, 25 and the holding case 36
Supply between the guide surfaces 36f and 36f to press-form the powder 14.
You. The pressure switch 52 allows the high-pressure pressurized fluid 7 to reach a predetermined pressure.
When it reaches, the set pressure detection signal is output to the operation circuit 53 and the
The pump 42 for the source is stopped. Of the booth pump 42 stop
If the specified time has passed since then, the solenoid valve
45 is closed and solenoid valves 54, 55 and 56 are opened.
Pressurized flow of the pressure receiving surfaces 25a, 25a of the pressure strips 25, 25 and the holding case 36
Most of the pressurized fluid 7 between the body guiding surfaces 36f, 36f is heated.
The elastic return of the pressure band bodies 25, 25 and the mold 2 causes the drainage.
It returns to the inside of the tank 43 through the pipe 63. In the oil tank 43
The placed liquid level detection switch 57 is where the pressurized fluid 7 returns.
Detects that the quantification is not achieved. In addition, the pressure strip 25, 25
Pressure receiving surfaces 25a, 25a and pressurized fluid guide surfaces 36f, 36f of holding case 36
The pressurized fluid 7 may be slightly
May remain. When the pressurized fluid 7 remains
Keeps the pressing strips 25, 25 pressing the mold 2.
Therefore, it becomes difficult to pull out the mold 2. Pressurization
Remaining of the fluid 7 is special when the axial length of the pressing strips 25, 25 is long.
Is remarkable. Therefore, the drainage device 64 is activated to add residual liquid.
Forced discharge of pressurized fluid. The operation procedure of the drainage device 64 is as follows. solenoid
The valves 59, 60, 61 are closed in advance. The oil tank
Based on the detection signal of the liquid level detection switch 57 arranged in 43,
Close solenoid valve 56 and solenoid valve 5
Open 9,60. Then, it was supplied from the compressed air supply source 58.
Compressed air is supplied by solenoid valves 60, 59, 55 and pressurized fluid supply.
After passing through the outlets 33a, 33a, the pressure receiving surfaces 25a, 25
out between a and the pressurized fluid guide surfaces 36f, 36f of the holding case 36
Then, the remaining pressurized fluid 7 is pressed. Pressed
The pressurized fluid 7 is a lower pressurized fluid supply / discharge port 33b, 33b, solenoid.
Pass the valve 54 and drain pipe 63 and
Will be returned to. When the return of the pressurized fluid 7 is completed,
Close solenoid valve 61 and close solenoid valve 61.
Open the pressure receiving surfaces 25a, 25a of the pressure belts 25, 25 and the holding case 36.
Compressed air remaining between the pressurized fluid guide surfaces 36f and 36f
Is discharged to the outside. Do not finish discharging the residual pressurized liquid.
After pulling out the pressurizing tool 21 as shown in FIG.
The shield 2 and the molded product 34 are separated. (Second Embodiment) FIG. 6 shows a device 120 of the present invention according to a second embodiment.
is there. The device 120 of the present invention faces the bottomed mold 121.
The outer side surface 121a, 121a is sandwiched between the pressure strips 127, 127.
You. The holding case 126 in which the pressure strips 127, 127 are housed is an outer cylinder.
Up and down of the pressurized fluid guide surfaces 126f, 126f formed on the inner surface of 123
Distributing grooves 123e and 123f are respectively provided near the ends.
Each of the distribution concave grooves 123e, 123f has a pressurized fluid supply port 123a, 12f.
3b is opened. In the lid 124 that covers the mold 121
Is provided with a pressurized air discharge hole 124a if necessary. Next, an example of the method of the present invention will be described below.
Description will be made in order. First, the flexible mold 121
In the state where the powder filling space 1 inside is filled with the powder 14.
It is inserted between the flexible pressure strips 127 and opened at the top.
The mouth is covered with the lid body 124. Secure the lid 124 with the fasteners 12.
Be tightened. Next, add to the pressurized fluid supply / discharge ports 123b, 123b below.
The pressurized fluid 7 is supplied. The pressurized fluid 7 supplied is a pressurized band.
The pressure receiving surfaces 127a, 127a of the bodies 127, 127 are arranged in this order from the bottom to the top.
Next pressurize. Opposing outer surfaces 121a, 121a of the mold 121
Is applied from the bottom to the top by the sequential pressurization of the pressing strips 127, 127.
The pressure is sequentially applied toward. Filled in mold 121
The powder 14 is charged by sequentially pressing the mold 121.
Pressure is applied in sequence from the bottom 1b to the top 1a in the filling space 1.
You. The air present in the powder 14 is accompanied by the sequential pressurization of the powder 14.
No, from the bottom area in the powder filling space 1 to the top 1a
And is pressed out from the pressurized air exhaust hole 124a of the lid body 124
Discharged to the department. It should be noted that the lid 124 has a compressed air discharge hole 124a.
If there is no air, the air present in the powder 14 is not filled with powder.
Squeezed to the upper end 1a in the space 1 and separated from the powder 14.
You. As a result, the molded product may be damaged by the pressurized powder 14.
There is no residual compressed air that leads to. Pressed strip
127,127 pressure receiving surfaces 127a, 127a and outer cylinder 123 pressurized fluid
The pressurized fluid 7 supplied between the guide surfaces 126f and 126f is not
If necessary, the powder 14 is raised to the specified final pressure.
Press molding. The pressurized fluid 7 has been subjected to pressure molding for a predetermined time.
If it is exceeded, the pressure will be reduced. Flexible mold 121 and
The pressure band members 127, 127 are
Due to elastic force, it will naturally return to its original inner dimensions. Finally, Mo
The lid 124 is removed from the sleeve 121 to form a solid molded product (not shown).
Omitted) is obtained. (Third Embodiment) FIGS. 7 to 12 show a third embodiment.
The device 220 of the present invention comprises a pressurizing tool 21 and a pressurizing tool 222.
The tool 21 to be pressed has the same structure as that of the first embodiment (see FIG. 1).
It is a success. The improvement in the device 220 of the present invention is in the pressing tool 222.
You. The pressure tool 222 includes two pressure bands inside the holding case 36.
The bodies 225 and 225 are arranged to face each other. The holding case 36 is rigid
The outer cylinder 33 of the body and the upper and lower ends of the outer cylinder 33 are attached to
It is composed of upper and lower lids 28 and 29 for holding 5,225 from above and below.
Each pressure strip 225 is made of a flexible material (eg, neoprene).
Made of rubber, urethane resin, etc.,
Its hardness is appropriately selected within the range of JIS rubber hardness 40 to 90 degrees.
You. The pressure-receiving surface 225a of each pressure strip 225 extends along the longitudinal direction.
Groove 22 for each pitch P (for example, P = 100 to 300 mm)
5b, 225b ... are recessed and are divided into seven pressure areas 225a-1, 2
25a-2, ..., 225a-7 are formed. These pressure areas
The central pressure area 225a-1 is the initial pressure area.
ing. Each of the concave grooves 225b, 225b ... Has a ring shape or a rod.
Elastic sealing materials 235, 235 ...
See figure). The elastic sealing material 235 limits the cross section to a P shape.
Although not shown, the cross section is O-shaped, V-shaped or
Of course, it is also possible to select an appropriate shape such as an X shape.
You. The holding case 36 has an elastic sealing material 235, 23 on its inner surface.
Pressurized fluid guide surfaces 36f, 36f that come into close contact with each of 5 ...
Have been. Each pressurizing fluid guide surface 36f has the above-mentioned pressurizing strip 2
The pressurized fluid supply / discharge port 33 facing the initial pressure region 225a-1 of 25
c is open. Formed on the pressure receiving surfaces 225a, 225a of the pressure strips 225, 225.
The number of divisions of the pressure area to be formed is seven as in the illustrated embodiment.
Although not shown in the drawings,
It may be divided into two or more. Furthermore, with the initial pressure area
Is limited to the central pressure area 225a-1 as in the illustrated embodiment.
Although not shown, although not shown, the
Among the pressure areas that are formed in multiple numbers according to the body shape
Of course, it is possible to select the most suitable one. Next, an example of the method of the present invention will be described below.
Description will be made in order. First, shown in FIG. 7 and FIG.
As described above, the pressurized tool 21 in which the powder 14 is filled in the powder filling space 1
To prepare. The pressurized tool 21 is inserted into the pressing tool 222,
The upper and lower clamps 12, 13 screwed to the pressure tool 222
Be held in place. Next, a pressurized fluid supply device (not shown)
The pressurized fluid 7 supplied from
It flows into the outlets 33c, 33c. The pressurized fluid 7 has a predetermined pressure (example
For example, 50-200kg / cm ² ), Pressurized fluid supply port 33c, 3
It flows out from 3c toward the pressure strips 225,225, and the pressure strips 225,2
25 initial pressure areas 225a-1 and 225a-1 and holding case 36
It enters between the pressure fluid guide surfaces 36f, 36f. Each initial pressure area 225
The pressurized fluid 7 flowing out to a-1 is as shown in Fig. 10 (A).
The upper and lower ends of the initial pressure area 225a-1 are elastic sealing materials 235,
Since it is divided by 235, only the initial pressure area 225a-1
Is pressed to cause the initial pressure area 225a-1 to expand and deform inward.
You. The mold 2 is the initial pressing area 225 of the pressing strips 225, 225.
a-1, 225a-1, the outer surface 2a, 2a of the area facing (see FIG. 8)
Only the light is pressed, and the powder 14 is pressed. Pressed powder
The air pressure in the body 14 (not shown) increases.
Therefore, it is formed with large particle gaps in unpressurized powder.
Rapidly discharged into the compressed air passages and compressed into the pressurized powder 14.
It does not remain in a compressed state. Of each pressure strip 225
In the initial pressurizing region 225a-1, the supply amount of the pressurizing fluid 7 increases.
The amount of deflection increases as the temperature rises. In the pressure strip 225
Recessed grooves 225b, 225 that are recessed above and below the initial pressure area 225a-1
The part b is deformed inward as shown in Fig. 10 (B).
You. Elastic sealing material 235, 235 fitted in the groove 225b, 225b
Holds as the grooves 225b, 225b deform inward.
A gap is formed between the case 36 and the pressurized fluid guide surface 36f.
Release the seal function. The pressurized fluid 7 is the elastic sealing material 23.
With the release of the sealing function of 5,235,
Pressure area 225a-adjacent to each initial pressure area 225a-1
It flows out to 2,225a-3, and this pressure area 225a-2,225a-3
Press. The mold 2 is a pressing area 225a of the pressing strip 225.
-2,225a-3 The outer surface 2a, 2a of the area facing
Then, the powder 14 is pressurized. Air in the pressurized powder 14 (Fig.
(Not shown) is not pressurized because the air pressure rises.
To the air passage formed by the large particle gap in the powder.
It flows out quickly and remains in the compressed state in the compressed powder 14.
There is no such thing. When the supply amount of the pressurized fluid 7 further increases,
The pressure fluid 7 is, as shown in FIG.
Pressure areas 225a-4, 225a-5 on the respective pressure receiving surfaces 225a and
The pressure areas 225a-6 and 225a-7 are sequentially pressed in the same manner as described above.
With the sequential pressurization of the pressure strip 225, the powder filling space 1
The filled powder 14 is the initial pressure of the pressure band 225,225.
A region in the powder filling space 1 facing the regions 225a-1 and 225a-1.
Pressure is sequentially applied from the area toward the ends 1a and 1b. Powder filling empty
The air present in the powder 14 filled in the space 1 is powder.
Initial pressurization of the press belts 225, 225 with the sequential pressurization of the body 14.
A region in the powder filling space 1 facing the regions 225a-1 and 225a-1.
Move from the area toward the ends 1a, 1b, and bolt part 9 of the cored bar 9
It is discharged from the screwing gap between a and 9b and nuts 10 and 11 to the outside.
You. As a result, the molded product may be damaged by the pressurized powder 14.
There is no residual compressed air that leads to. Pressed strip
225, 225 pressure receiving surface 225a, 225a pressure and holding case 36 pressure
The pressurized fluid 7 supplied between the fluid guide surfaces 36f and 36f is
Furthermore, a predetermined final pressure (for example, 500 to 5,000 kg / cm ² )Until
The pressure is increased and the powder 14 is pressure-molded. Pressurized fluid 7 is predetermined
After the pressure molding for a certain period of time, the pressure is reduced. Flexible
The mold 2 and the pressure strips 225, 225 depressurize the pressurized fluid 7.
As shown in Fig. 12, the original elastic force
Naturally returns to the state of the in-mold dimension D. Pressurized tool 21
Remove the upper fastener 12 screwed to the holding case 36
After that, it is pulled out from the holding case 36. The pressurized tool 21 is
The nuts 10 and 11 arranged one above the other and the lids 3 and 4 are removed,
The molded product 234 and the cored bar 9 are separated. (Fourth Embodiment) FIGS. 13 to 17 show an apparatus 320 of the present invention according to a fourth embodiment.
It is shown. The device 320 of the present invention includes a pressurizing device 21 and a pressurizing device.
It consists of ingredients 322. The tool 21 to be pressed is the same as the first embodiment (first
(See FIG. 1). The improvement in the device 320 of the present invention is in the pressing tool 322.
You. The pressure tool 322 includes two pressure bands inside the holding case 36.
The bodies 325, 325 are arranged to face each other. The holding case 36 is rigid
Flexible outer tube 33 and the upper and lower ends of the outer tube 33 are attached to the pressure strip 32.
It is composed of upper and lower lids 28 and 29 for holding 5,325. Each pressure band
The body 325 is made of a flexible material (eg, neoprene rubber, wool
The core material layer 327 with a coating layer 328.
It is coated. The core layer 327 was formed separately
Plate-shaped members 327a, 3 of appropriate length L (for example, L = 100 to 300 mm)
27b, 327c, 327d ... with their end faces abutting each other
They are arranged in a line. Each plate material 327a, 327b, 327
c and 327d are end portions of the powder filling space 1 from the plate-shaped material 327a in the center.
Increase the elastic coefficient as you go to 1a, 1b
I am doing it. In order to obtain the desired longitudinal elastic modulus, the plate-shaped members 327a, 3
27b, 327c, 327d rubber hardness (for example, JIS rubber hardness 40 to 90
It is common to select the
You. In the pressure strip 325, the core layer 327 is covered with the coating layer 328.
It is not limited to the overlaid one, and the illustration is omitted.
However, it may be formed of only the core layer 327. Pressure strip 3
25 is a pressure area divided into seven areas 325-1, 325-2, ..., 32-7
Is formed, and the central pressure area 325-1 is used as the initial pressure area.
To do. The holding case 36 has, on the inner surface thereof, a pressure strip 325, 325.
Pressurizing fluid guide surfaces 36f, 3 that closely contact the pressure receiving surfaces 325a, 325a of the
6f is formed. On each pressurized fluid guide surface 36f,
Apply pressure to the area of the pressure strip 325 that faces the initial pressure area 325-1.
The pressure fluid supply port 33c is opened. It should be noted that the pressing area formed on the pressing strip 325 is divided.
The number is limited to seven as in the illustrated embodiment.
Although not shown in the figure, it is divided into two or more.
Just do it. Further, as the initial pressurizing area,
As described above, it is not limited to the central pressure area 325-1.
Although not shown, among the plurality of pressure areas formed,
Of course, it is possible to select either one. Next, an example of the method of the present invention will be described with reference to the user of the device 320 of the present invention.
Description will be made in order. First, as shown in FIG. 13 and FIG.
As described above, the pressurized tool 21 in which the powder 14 is filled in the powder filling space 1
To prepare. The pressurized tool 21 is inserted into the pressing tool 322,
The upper and lower clamps 12, 13 screwed to the pressure tool 322 are used to
Be held in place. Next, a pressurized fluid supply device (not shown)
The pressurized fluid 7 supplied from
It flows into the outlets 33c, 33c. The pressurized fluid 7 has a predetermined pressure (example
For example, 50-200kg / cm ² ), Pressurized fluid supply ports 33c, 33c
From the pressure strips 325, 325,
Initial pressurization area 325-1 and pressurizing fluid guide surface 3 of holding case 36
It flows in between 6f. Spilled into the initial pressure area 325-1
The pressurized fluid 7 is initially applied as shown in Fig. 15 (A).
Only the pressure area 325-1 is pressed, and the initial pressure area of the pressure band 325 is
The area 325-1 is expanded and deformed inward. The reason is early
The elastic modulus of the pressure area 325-1 is equal to that of the pressure areas 325-2, 325-3.
Since it is smaller than the elastic modulus of
This is because -1 is easily deformed. Initial stage of pressure strip 325
With the expansion deformation of the pressure area 325-1, the mold 2 is
Opposed to the initial pressure areas 325-1 and 325-1 of the pressure strips 325 and 325.
Only the outer surfaces 2a, 2a of the area to be held are clamped and the powder 14 is pressed.
To do. Air (not shown) in the pressurized powder 14 is empty.
As the air pressure rises, the size in the unpressurized powder
Rapidly flows out into the air passage formed by various particle gaps and pressurizes
It does not remain in the compressed powder 14 in a compressed state.
No. The initial pressure area 325-1 of each pressure strip 325 is a pressurized fluid.
7 is shown in FIG. 15 (B) as the supply pressure increases.
Adjacent to the initial pressure area 325-1 of the pressure strip 325.
It flows out to the pressurizing area 325-2, 325-3, and this pressurizing area 325-
Press 2,325-3. The mold 2 is a pressure band 325,325.
Outside the area facing the respective pressure areas 325-2, 325-3 of
Surfaces 2a and 2a (see Fig. 14) are pinched to press powder 14
You. The air (not shown) in the pressurized powder 14 is the air
As the pressure rises, the large
It rapidly flows out into the air passage formed by the particle gap and is pressurized.
It does not remain in the compressed powder 14 in a compressed state. In addition,
The pressure of the pressurized fluid 7 is the initial pressure region 325-
Pressurized areas 325-2 and 325-3 are more
It increases when pressure is applied. Due to the phenomenon of increased pressing force
And the initial pressure area 325-1,325-1 of the pressure band 325,325.
Initially pressed powder in the area in the opposing powder filling space 1
14 is further pressurized. This increase phenomenon of the pressing force is
Discharges even the fine compressed air remaining in the pressurized powder 14.
Will complete the degassing of the compressed air.
When the supply pressure of the pressurized fluid 7 further increases, the pressurized fluid 7
As shown in FIG. 16, each of the pressure receiving members 325, 325 receives pressure.
Pressure areas 325-4, 325-5 and pressure area 32 on surface 325a
5-6 and 325-7 are sequentially pressurized as described above. Pressure strip 325,
With the sequential pressurization of 325, it is filled in the powder filling space 1.
The powder 14 present is the initial pressing area 325-of the pressing strips 325, 325.
From the region in the powder filling space 1 facing 1,325-1 to the end 1
The pressure is sequentially applied toward a and 1b. Fill the powder filling space 1
The air intervening in the powder 14 that has been stored is sequentially added to the powder 14.
Initial pressure area 325-1,32 of the pressure strip 325,325 due to pressure
From the region in the powder filling space 1 facing 5-1 to the end portions 1a, 1b
Move toward the bolts 9a, 9b of the core metal 9 and the nut 10,
It is discharged from the screwing gap with 11. As a result, pressurization
The compressed powder 14 contains compressed air that may damage the molded product.
There is no remaining energy. Pressure receiving surface 325 of the pressure strips 325, 325
a, 325a full surface and holding case 36 pressurized fluid guide surface 36f, 36f
The pressurized fluid 7 supplied between the
(For example, 500-5,000kg / cm ² ), And powder 14
Press molding. The pressurized fluid 7 has been subjected to pressure molding for a predetermined time.
If it is exceeded, the pressure will be reduced. Flexible mold 2 and pressure
The strips 325, 325 are shown in FIG. 17 as the pressurized fluid 7 is decompressed.
As shown, the original internal dimension D
Naturally return to the state. The pressurized tool 21 is screwed into the holding case 36.
After removing the upper tightening tool 12
Is taken out. The pressurized tool 21 is a nut that is placed vertically.
10 and 11 and lids 3 and 4 are removed, molded product 339 and core 9
And the mold 2 are separated. (Fifth Embodiment) FIGS. 18 to 23 show a device 440 of the present invention according to a fifth embodiment.
It is shown. The device 440 of the present invention is the book of the third embodiment.
The major difference from the invention device 220 (see FIG. 7) is the holding
The pressing strips 225, 225 and the mold 2 held in the case 36
In between, a backpack band 457,457 is inserted.
You. Each back-up strip 457 is made of a flexible material (eg,
For example, neoprene rubber, urethane resin, etc.)
The initial pressing force formed on the pressure receiving surface 225a of the corresponding pressure strip 225.
The powder filling space 1 is opened from the area facing the pressure area 225a-1.
The elastic coefficient increases as you move toward the mouth ends 1a and 1b.
I have it. Each back-up strip 457 is shown in Figure 18.
As shown in Fig.
The materials 457a, 457b, 457c, and 457d were brought into contact with their end faces.
They are arranged in a line in a state. To obtain the desired elastic modulus
Is the rubber hardness of the plate materials 457a, 457b, 457c, 457d (for example, J
The IS rubber hardness is 40 to 90 degrees)
Is common. Another mode of each back-up strip 457 and
As shown in Fig. 20, the elastic modulus formed separately
Multiple plate-shaped materials 457a, 457e, 457f, 457g of different sizes in a row
The placed ones were covered with flexible inner and outer layers 457h and 457i.
There is something. The back-up strip 457 is shown in the figure.
As shown in the example, it is limited to those whose elastic coefficient is changed stepwise.
Although not shown, the pressure strip 225 is not shown.
From the area facing the initial pressure area 225a-1 formed in
Elasticity increases toward the open ends 1a and 1b of the powder filling space 1.
Of course, the coefficient may be continuously increased. Next, an example of the method of the present invention will be described below.
Description will be made in order. First, as shown in FIG. 18 and FIG.
As described above, the pressurized tool 21 in which the powder 14 is filled in the powder filling space 1
Is loaded in the pressure tool 422 in the same manner as in the third embodiment.
Be done. Next, the pressurized fluid 7 has a predetermined pressure (for example, 50 to 20).
0 kg / cm ² ), The pressurized fluid supply / discharge port 33 of the holding case 36
It flows out from c, 33c, and the initial pressure area 22 of the pressure strips 225, 225.
5a-1, 225a-1 and pressurizing fluid guide surfaces 36f, 36 of holding case 36
Enter between f. Pressurized outflow to the initial pressure area 225a-1
The fluid 7 is, as shown in FIG.
-1 upper and lower ends are divided by elastic sealing material 235,235
Therefore, only the initial pressure area 225a-1 is pressed to
The area 225a-1 is expanded and deformed inward. Mold 2 is
Opposed to the initial pressure area 225a-1, 225a-1 of the pressure strips 225, 225
Only the outer surfaces 2a, 2a (see Fig. 19) of the area to be backed up are backed up.
The powder 14 is pressed by being pressed through the strips 457, 457.
You. The air (not shown) in the pressurized powder 14 is the air
As the pressure rises, the large
It rapidly flows out into the air passage formed by the particle gap and is pressurized.
It does not remain in the compressed powder 14 in a compressed state.
The initial pressure region 225a-1 and the initial pressure region of each pressure strip 225
The area of the back-up strip 457 facing the area 225a-1 is
The amount of deflection increases as the total supply of the pressurized fluid 7 increases.
Become Pressurized fluid 7 is
As shown in FIG. 21 (B), the initial pressing area 2 of each pressing strip 225
Outflow to pressurized areas 225a-2, 225a-3 adjacent to 25a-1
Then, the pressure areas 225a-2 and 225a-3 are pressed. the mall
2 is the pressure area 225a-2,225 of each of the pressure bands 225,225.
The outer surfaces 2a, 2a of the area facing a-3 are back-up strips.
The powder 14 is pressed by being pressed through 457, 457. Pressurized
The air pressure in the air (not shown) in the powder 14 is increased.
Therefore, in the large particle gap in the unpressurized powder
Rapidly flowing pressurized powder into the formed air passage 14
It does not remain in a compressed state inside. The pressure area 22
The pressure of the pressurized fluid 7 that presses 5a-2, 225a-3 is
The elastic coefficients of the plate members 457b and 457b that form the up band 457 are
Since it is larger than that of plate material 457a, the initial pressure
It is higher than when only the area 225a-1 is pressurized. Pressurization
Due to the phenomenon of increase in force, the initial area 225a of the pressing strips 225, 225
-1,225a-1 Powder 14 initially pressed in the area facing
Is further pressurized. This phenomenon of increase in pressure force is
Discharges even the fine compressed air remaining in the compressed powder 14.
And complete degassing of compressed air. Addition
When the supply pressure of the pressurized fluid 7 further increases, the pressurized fluid 7
As shown in FIG. 22, the pressure receiving surfaces 225a, 225a of the pressure strips 225, 225
Pressure areas 225a-4, 225a-5 and pressure areas in
225a-6 and 225a-7 are sequentially pressurized in the same manner as above. Pressed strip
Filling powder filling space 1 with sequential pressurization of 225,225
The powder 14 contained is the initial pressure area 2 of the pressure strips 225, 225.
Is it an area in the powder filling space 1 facing 25a-1, 225a-1?
Pressure is sequentially applied toward the ends 1a and 1b. Powder filling space 1
The air present in the powder 14 filled in the
With the sequential pressurization of
Is it an area in the powder filling space 1 facing 25a-1, 225a-1?
From the other end toward the end portions 1a, 1b, and the bolt portions 9a, 9b of the cored bar 9
Is discharged to the outside through the screwing gap between the nuts 10 and 11. So
As a result, the molded product was not damaged in the pressed powder 14.
There is no residual compressed air. Pressure strip 225,22
5 Pressurized fluid plan of the pressure receiving surfaces 225a, 225a of 5 and the holding case 36
The pressurized fluid 7 supplied between the inner surfaces 36f and 36f is further
Constant final pressure (eg 500-5,000 kg / cm ² ) Boosted to
Then, the powder 14 is pressure-molded. Completed pressure molding for a predetermined time
If so, the pressurized fluid 7 is depressurized. Flexible mode
Rud 2, back-up strips 457,457 and pressure strips 225,225
As shown in FIG. 23, as the pressurized fluid 7 is depressurized,
Naturally restores to the original D dimension by the elasticity of oneself
Go home. The pressurized tool 21 is screwed to the holding case 36 and
After removing the fastener 12, the molded product 459 is separated. (Sixth Embodiment) FIGS. 24 to 30 show a device 520 of the present invention according to a sixth embodiment.
Is shown. The device 520 of the present invention is used to form a belt-shaped molded product
It is molded in a substantially horizontal state. Inventive device 520
Is mounted on the fixed lower die 521 and on the outside of the lower die 521 so that it can move up and down.
The upper surface 521a of the lower mold 521 is surrounded when the upper die 521a is stopped.
And the frame 523 that forms the powder filling space 1 and the lower mold 521
The upper mold 522 descends toward the surface 521a.
The upper surface 521a of the lower mold 521 is formed of a rigid surface. Up
The mold 522 is provided with an annular groove 535 and has an annular groove.
The surface on the inner side of the groove 535 is kept as the pressurized fluid guide surface 536f.
Both the holding case 536 and the peripheral edge portion are fitted in the annular groove 535.
To form a pressure receiving surface 525a that is in close contact with the pressurized fluid guide surface 536f
Of the pressurized fluid guide surface 536f.
A pressurized fluid supply port 536f is opened at that location. Pressure strip 52
5 is made of a flexible material such as neoprene rubber,
The hardness is selected within the range of JIS rubber hardness of 40 to 90 degrees. Pressurization
As shown in FIG. 30, the strip 525 is located on the pressure receiving surface side of the peripheral edge portion 525b.
An annular seal ring fitting groove 537 is formed in the recess.
The seal ring fitting groove 537 is made of a flexible material such as neoprene rubber.
The seal ring 538 made of the material
To be in close contact with the wall surface 536d that forms the 36 annular groove 535
It has been fitted. The seal ring 538 has a hardness of JIS rubber.
Hardness is selected in the range of 40 to 90 degrees. Seal ring 538
Is not limited to the O-shaped cross section, and the illustration is omitted.
However, an appropriate shape such as a V-shaped cross section or an X-shaped cross section is selected.
The inner side 535a of the annular recessed groove 535 of the holding case 536 is the pressing band 52.
Back up the inner part 525d formed on the peripheral part 525b of
Is formed. The seal ring 538 is pressurized
Apply between the pressure receiving surface 525a of the strip 525 and the pressurized fluid guide surface 536f.
As the pressurized fluid 7 is supplied, the peripheral edge of the pressing strip 525
When the part 525b is compressed and deformed, whether it is inside the seal ring fitting groove 537
A part of 538a slightly bulges out. The seal ring 538 is pressurized
The holding case 536 of the holding case 536 is compressed and deformed by receiving the pressing force of the fluid 7.
Press the bulging part against the wall surface 536d and fit the seal ring
The side surface 537b forming the groove 537 is pressed. Seal ring 538
Keeps the watertightness by both the pressing. Pressure strip 52
Since 5 is flexible, pressing the seal ring 538
The inner depth 525d is compressed and deformed from the ring fitting groove 537.
The inner depth 535a of the annular groove 535 of the holding case 536 is
In order to back up the deformation, the inner part 525 of the pressure band 525
Adhere the surface 525d-1 of d to the wall surface 536d of the holding case 536.
Prevent the seal ring 538 from moving. Seal ring 5
The bulging portion 538a of the 38 is formed on the wall surface 536d of the holding case 536 and the seal.
Stable on the side 537b that forms the ring groove 537
You. The frame body 523 has an inner peripheral edge made of neoprene rubber or the like.
An annular elastic edge member 539 made of an elastic material is used for the powder filling empty space.
It is mounted so as to surround the space 1. Next, the usage of the device 520 of the present invention will be explained according to the work procedure.
To do. First, as shown in FIG. 24, place the upper mold 522 in the upper standby position.
And the frame body 523 is stopped at the upper stop position.
Let it. Next, the powder 14 is powder-filled in the powder filling space 1.
Fill with ingredient 524. When the filling of the powder 14 is completed, the second
As shown in Fig. 5, contact the frame 523 with the lowered upper mold 522.
You. The pressurized fluid 7 is the pressurized fluid supply port 536 of the holding case 536.
From c, pressurize the pressure receiving surface 525a of the pressure strip 525 and the holding case 536.
It is supplied between the pressure fluid guide surface 536f. The pressurized fluid 7 is
First, the pressurized fluid is supplied to the pressure receiving surface 525a of the pressure belt 525.
Form the initial pressurization area 525a-1 at the part facing the inlet 536c.
And expand and deform the initial pressing area 525a-1 of the pressing strip 525.
Let it. The powder 14 in the powder filling space 1 is
Only the area corresponding to the initial pressure area 525a-1 is pressurized.
You. Air (not shown) in the pressurized powder 14 is powder
As the air pressure increases with the pressurization of 14, it is pressurized.
Rapidly into the air passage formed by the interstices of particles in the powder
Flowed out and remained in the compressed powder 14 in the compressed state
There is nothing to do. The pressurized fluid 7 is supplied as the supply amount increases.
No, as shown in FIG. 26, the initial pressing area 5 of the pressing strip 525.
It flows out to the next-stage pressure area adjacent to 25a-1 and
The expansion deformation of the pressure area is gradually increased. Powder filling space
The powder 14 filled in No. 1 is the initial loading of the pressing strip 525.
From the area inside the powder filling space 1 facing the pressure area 525a-1
Initial pressure is gradually applied toward the ends 1a and 1b. Fluid filling
The air present in the powder 14 filled in the space 1 is
With the sequential pressurization of the powder 14, the initial pressurization region of the press belt 525
End from the region in the powder-pair filling space 1 facing the region 525a-1
Squeezed towards 1a, 1b. As a result, the initial pressure
A band-shaped molded product 534 (see FIG. 27) is contained in the powder 14
There is no residual compressed air that could lead to damage. Addition
The entire pressure receiving surface 525a of the pressure band 525 and the pressurized flow of the holding case 536.
The pressurized fluid 7 supplied between the body guiding surface 536f and
Depending on the specified final pressure (for example, 500 to 5,000 kg / c
m ² ), The powder 14 is pressure-molded. The frame body
The elastic edging 539 attached to the 523 is applied to the rim 539 as shown in FIG.
The inner peripheral edge 539a receives the pressure of the pressure band 525 and the powder filling space
Bulge into 1. The pressurized fluid 7 is pressurized for a predetermined time.
When the shape has passed, the pressure is reduced. The pressure strip 525 is pressed
Along with the decompression of the fluid 7, it naturally returns to its original state or is forcibly restored.
Go home. Finally, as shown in FIG.
Retract to the standby position and move the frame 523 to the lower standby position.
And place the molded product 534 on the upper surface 521a of the lower mold 521.
You. The elastic edge member 539 mounted on the frame body 523 is a pressure band.
When the pressing force of the body 525 is released, the inner peripheral edge 539a (see FIG. 26)
(Light) recovers elastically and naturally separates from the peripheral edge of the molded product 534.
And then remove the mold smoothly. The pressure strip 525 has the pressure receiving surface 525a as a smooth surface.
However, it is not limited to this, and the illustration is omitted.
However, as in the third embodiment (see FIG. 7), the pressure receiving surface is made longer in the axial direction.
Multiple recessed grooves that are recessed at appropriate intervals
A plurality of pressurizing areas and elastic seals in each of the annular grooves.
Fitting the rule ring, or the fourth embodiment (see FIG. 13).
Appropriate) that is located between both ends of the pressing strip as shown in FIG.
A local area is used as an initial pressure area and the wall structure of the pressure band is
The elastic modulus of the material is changed from the initial pressure region to the end of the pressure band.
Grows continuously or in steps towards
And further, as in the fifth embodiment (see FIG. 18).
The pressure receiving surface is recessed at appropriate intervals in the axial direction.
It is divided into a plurality of pressure areas by the concave groove of several warehouses and the concave groove
An elastic seal ring is attached to each of the
To the side, the elastic modulus goes from the initial pressure area towards the end
Buckup band that grows continuously or gradually
It is of course possible to arrange the body. (Other Examples) In each of the above examples, a square column shaped article having a flat surface is obtained.
As shown in FIG.
The inner surface 2j of the mold) and the inner surface 121j of the mold 121 (see FIG. 6).
All of them have a square cross section and a flat surface.
You. However, the shape of the powder pressure molding surface is limited to a square surface.
Although not shown, the three-dimensional shape to be molded is not shown.
Various inner surface shapes are possible depending on the shape. Furthermore, the present invention
The apparatus is a mold in the first to fifth embodiments.
2 (121), but is not limited to this
Although not shown, a mold is not used.
The pressing surface or back-up of the pressing strip 25 (127,225)
It is not necessary to form the powder filling space 1 on the pressing surface of the strip 457.
It is possible to argue.

[Effect of the present invention]

As described above in detail, the present invention has the following excellent effects. According to the present invention, the air in the powder filled in the powder filling space can be squeezed to the end of the powder filling space that does not substantially affect the molded product. Is not included. According to the present invention, the powder and the compressed air can be completely separated from each other, so that the molded product is not damaged at the time of demolding. According to the confirmation test by the present inventor, it was possible to obtain a square column molded product having a width of 300 mm, a thickness of 30 mm, and a length of 4,000 mm by pressure-molding the ceramic powder. As is clear from this confirmation test, the present invention makes it possible to obtain a long molded article which has been impossible in the past.

[Brief description of drawings]

1 to 5 show a powder pressure molding apparatus of a first embodiment for carrying out the method of the present invention, wherein FIG. 1 is a longitudinal sectional view and FIG. 2 is a sectional view of FIG. A cross-sectional view taken along the line II-II, FIGS. 3 (A) and (B) are vertical cross-sectional views showing an enlarged main part of the initial pressurization state, and FIG. FIG. 5 is a schematic view of a pressurized fluid supply / drainage device and a drainage device in the other part of the drawing, and FIG. 5 is a vertical sectional view showing a demolded state, and FIG. 2 is a longitudinal sectional view showing a second embodiment of the present invention, FIGS. 7 to 12 show a third embodiment of the device of the present invention, FIG. 7 is a longitudinal sectional view, and FIG. Fig. 9 is a cross-sectional view taken along line VIII-VIII, Fig. 9 is a partial cutaway view showing a part of the pressure receiving surface side of the pressure band, Fig. 10
Figures (A) and (B) are vertical cross-sectional views showing enlarged main parts in a pressurized state,
FIG. 11 is a vertical sectional view showing a pressurized state, FIG. 12 is a vertical sectional view showing a demolded state, and FIGS. 13 to 17 show a fourth embodiment of the device of the present invention. Fig. 13 is a longitudinal sectional view, Fig. 14 is a lateral sectional view taken along line XIV-XIV in Fig. 13, Fig. 15 (A).
(B) is an enlarged vertical cross-sectional view of a main part under pressure, FIG. 16 is a vertical cross-sectional view showing a pressed state, FIG. 17 is a vertical cross-sectional view showing a released state, and FIGS. 18 to 23. FIG. 18 shows a fifth embodiment of the device of the present invention. FIG. 18 is a longitudinal sectional view and FIG. 19 is FIG.
FIG. 21 (A) is a cross-sectional view taken along line X IX-X IX, FIG. 20 is an enlarged vertical cross-sectional view of a main portion of another embodiment of the backup band.
(B) is an enlarged vertical cross-sectional view of a main part of a pressed state, FIG. 22 is a vertical cross-sectional view showing a pressed state, FIG. 23 is a vertical cross-sectional view showing a demolded state, and FIGS. 24 to 30. FIG. 24 shows a sixth embodiment of the device of the present invention, FIG. 24 is a vertical sectional view showing a state where powder is filled, and FIG. 25 is a vertical sectional view showing a state where initial pressurization is started. Fig. 26 is a vertical cross-sectional view showing the entire pressurized state, Fig. 27
Figure is a vertical cross-sectional view showing the demolded state, Figure 28 is II X in Figure 25.
VIII-II X VIII line cross-sectional view, FIG. 29 is a horizontal cross-sectional view taken along the line II X IX-II X IX of FIG. 25, FIG. 31 and 32 show a conventional powder pressure molding apparatus, in which FIG. 31 is a longitudinal sectional view and FIG. 32 is a transverse sectional view. 1 ...... Powder filling space 25 (225,325,525) ...... Pressurizing strip 36 (536) …… Holding case 36f (536f) …… Pressurized fluid guide surface 33c (536c) …… Pressurized fluid supply port 235 …… Elastic sealing material 457 …… Back-up band

Claims (15)

[Claims] 1. A powder filling space having a long axial length formed on the pressing surface side of a flexible pressing strip is filled with powder, and the pressure receiving surface of the pressing strip is applied with a pressurized fluid. In the method of press-molding powder by pressing, the pressure region of the pressure strip is moved from the wall portion of the pressure strip corresponding to one part of the powder filling space to the end of the powder filling space. Powder pressure molding characterized in that pressure is applied until the entire pressure receiving surface of the pressure band becomes a pressure region by gradually expanding in time toward the wall portion of the corresponding pressure band. Method. 2. When the powder is pressure-molded, the powder is preliminarily expanded by gradually expanding the pressure region of the pressure band toward the edge of the powder filling space with a low-pressure pressure fluid. The powder pressure-molding method according to claim 1, wherein after pressing, the entire pressure receiving surface of the pressure band is simultaneously pressurized with a high-pressure pressurized fluid. 3. A powder pressure molding apparatus comprising a flexible pressure strip having a powder filling space with a long axial length formed on the pressure surface side, and a holding case for holding the pressure strip. The pressure receiving surface of the pressing strip is divided into a plurality of pressing regions by a plurality of recessed grooves that are provided at appropriate intervals in the axial direction of the pressing strip. One of the pressure areas selected from among the above is the initial pressure area, in each of the groove,
An elastic sealing material is fitted, and the holding case is provided with a single pressurized fluid guide surface that comes into close contact with all of the elastic sealing material, and faces the initial pressurized area of the pressurized fluid guide surface. The powder pressure molding apparatus is characterized in that a pressurized fluid supply port is opened in the portion. 4. The powder pressure molding apparatus according to claim 3, wherein a part of the powder filling space is formed by the pressing surface of the pressing strip. 5. The powder pressure molding apparatus according to claim 3, wherein a flexible mold is arranged on the pressure surface side of the pressure band. 6. The powder pressure molding apparatus according to claim 3, 4, or 5, wherein a core metal penetrating in the axial direction is arranged in said powder filling space. 7. A powder pressure molding apparatus comprising a flexible pressure strip having a powder filling space having a long axial length formed on the pressure surface side, and a holding case for holding the pressure strip. The pressing band has an appropriate local portion located between both ends of the pressing band as an initial pressing region, and the elastic coefficient of the wall forming material of the pressing band is the initial pressing region. The pressure is increased continuously or stepwise from the region toward the end of the pressing strip, and the holding case has a pressurized fluid guide surface facing the pressure receiving surface of the pressing strip. A pressurizing fluid supply port having a pressurizing fluid supply port opened at a portion of the pressurizing fluid guide surface facing the initial pressurizing region of the pressurizing strip; 8. The powder pressure molding apparatus according to claim 7, wherein a part of the powder filling space is formed by the pressing surface of the pressing strip. 9. The powder pressure molding apparatus according to claim 7, wherein a flexible mold is arranged on the pressure surface side of the pressure band. 10. A cored bar penetrating in the axial direction in the powder filling space, as claimed in claims 7 and 8.
Item or the powder press molding apparatus according to Item 9. 11. A powder pressure molding apparatus comprising a flexible pressure strip having a powder filling space with a long axial length formed on the pressure surface side, and a holding case for holding the pressure strip. The pressure receiving surface of the pressing strip is formed with a plurality of pressing regions defined by a plurality of recessed grooves that are recessed at appropriate intervals in the axial direction of the pressing strip. One pressure area selected from the pressure areas is set as an initial pressure area, an elastic seal material is fitted in each of the recessed grooves, and the holding case is made of all of the elastic seal material. One pressurizing fluid guide surface that is in close contact with the pressurizing fluid guide surface is formed, and a pressurizing fluid supply port is opened at a portion of the pressurizing fluid guide surface that faces the initial pressurizing region. A flexible back-up strip is disposed on the pressure surface side, and the elastic coefficient of the wall component of the back-up strip is It is characterized in that it becomes larger stepwise or continuously as it goes from the region corresponding to the initial pressure region formed in the strip toward the wall portion corresponding to the end of the powder filling space. And powder pressure molding equipment. 12. The powder pressure molding apparatus according to claim 11, wherein the pressing band and the back-up band are integrally formed. 13. The powder pressure molding apparatus according to claim 11, wherein a part of the powder filling space is formed on the inner surface of the back-up strip. 14. The powder pressure molding apparatus according to claim 11 or 12, wherein a flexible mold is arranged on the inner surface of the back-up strip body. 15. A core metal penetrating in the axial direction in the powder filling space, wherein the core metal is arranged.
Item, the powder pressure molding apparatus according to Item 13 or 14.