JPH1158421A - Mold device for cast molding - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a mold device for cast molding which can demold a molding easily in a short time. SOLUTION: A mold device 10 for cast molding is equipped with a lower mold 12, an upper mold 11, an injection port 26 for injecting a resin composition into a cavity 15 formed by the combination of the upper and lower molds 11, 12, deaeration-air introduction holes 17 which are formed in the upper mold 11 to deaerate the cavity 15, air introduction holes 19 which are formed apart from each other in the upper mold 11 and introduce air into the cavity 15, an air introduction hole 24 formed in the lower mold 12, and an air introduction valve 21 which protrudes to the cavity 15 side by air supplied to the air introduction holes 19, 24. In this way, since the air introduction holes equipped with the air introduction valves in the openings are formed apart from each other, and since air introduced from the valves moves around uniformly between the first mold and a molding, the molding can be demolded easily and surely.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a casting mold apparatus suitable for use in casting a container such as a tub or a basin for a wash basin.

[0002]

2. Description of the Related Art Conventionally, for example, a resin composition obtained by adding a filler to a vinyl ester resin has been cast to produce an artificial marble bathtub, a washbasin for a washbasin, and the like. This mold device for cast molding includes a male die having a surface corresponding to the shape of a product surface (hereinafter referred to as a product surface), that is, a lower die, and a back surface opposite to the product surface (hereinafter referred to as a product back surface). A female mold having a surface having a shape corresponding to the shape of the upper mold, and a resin composition is injected into a cavity formed by combining the upper mold and the lower mold, and a basin for a bathtub or a washbasin. And other products.

[0003] In such casting of bathtubs and washbasins,
Before injecting the resin composition, the air in the cavity is suctioned and deaerated from one or two deaeration holes (vacuum holes) provided in the upper die, and the back reinforcing layer of the product is suctioned to the surface of the upper die. After fixing, the resin composition is injected into the cavity. When the mold after molding is opened after the resin composition is cured, work such as cooling the lower mold (male mold) is generally performed.

After the mold is cooled, an air press-in valve (protruding pin) provided at the cavity-side opening of each of the air press-in holes provided in each of the upper mold and the lower mold is operated, and the air press-in valves are operated. The on / off operation is performed so that the molded product is attached to either the upper mold or the lower mold. Then, the molded product is released (mold release) by operating an air injection valve provided on the mold on the side where the molded product is attached to press-in air between the mold and the molded product.

[0005]

However, in the conventional casting mold apparatus, as described above, only one air injection hole having an air injection valve at its opening is provided for each of the upper die and the lower die. Not provided. As described above, in the case of air injection from one place, the air injected between the mold and the molded product from the single air injection hole tends to be biased, so that air is uniformly injected over the entire surface of the molded product. Often not. As a result, demolding (release) of the molded product is not properly performed, and only a part of the molded product may be separated from the mold, and another portion may remain on the mold. For this reason, it has been necessary to manually remove the molded product from the mold using a tool, which has caused a problem that the time required for demolding has been prolonged.

The present invention has been made in view of the above-mentioned problems of the prior art, and provides a casting mold apparatus capable of easily and quickly releasing a molded article from a mold. What you want to do.

[0007]

In order to achieve the above object, a casting mold apparatus according to the present invention comprises a first mold having an inner surface having a shape corresponding to the shape of the back side of a product; Having an inner surface of a shape corresponding to the shape of the front side of the second
A mold, an injection port for injecting a resin composition into a cavity formed by the inner surfaces of the first mold and the second mold, and a plurality of injection holes provided at a plurality of locations of the first mold. A deaeration hole for performing air, and an air injection hole provided at a plurality of locations in the first mold and separated from each other and at least one location in the second mold to press air into the cavity. An air press-in valve provided at each opening of the air press-in hole and protruding toward the cavity by air press-fitted into the air press-in hole.

According to the first aspect of the present invention, since the air injection holes provided with the air injection valves at the openings thereof are provided in the first mold at a plurality of locations and separated from each other, the air injection valves are provided. By actuating the air, the air press-fitted from the air injection hole is evenly distributed between the first mold and the molded product, so that the molded product is easily and almost completely demolded.

According to a second aspect of the present invention, in the first aspect of the invention, a plurality of deaeration holes are provided apart from each other.

According to the second aspect of the present invention, since the plurality of deaeration holes are provided apart from each other, the back reinforcing layer is attached to the first mold at the time of casting, and the deaeration holes are inserted through these deaeration holes. In this case, the adhesion between the back reinforcing layer and the first mold is improved.

According to a third aspect of the present invention, in the first or second aspect of the present invention, air can be injected from the vent hole.

According to the third aspect of the present invention, since air can be press-fitted between the first mold and the molded product through the deaeration hole at the time of demolding, it is possible to assist the demolding of the molded product. it can.

[0013]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An air press-in valve protrudes toward a cavity side by air press-fitted into an air press-in hole provided with the air press-in valve, and is simultaneously press-fitted from a slit provided in a base portion of the air press-in valve. Flows into the space between the mold and the molded product and is released from the mold.

In the case where the product to be formed by casting is a bath tub having a deep dimension in the height direction, when the bath tub as a molded product is removed from the bath,
By actuating the air injection valve, the air injection valve is inserted into the opening so that the air injected from the air injection hole can be evenly distributed between the first mold and the bathtub as a molded product so that the mold can be removed more reliably. The air pressure injection holes provided with the first and second bathtubs are provided at two to four locations on both sides in the longitudinal direction from the center of the bottom portion of the first type bathtub on the back side of the product.
Approximately one location is provided at each corner. Also, in the second mold on the surface side of the product, one part of the portion serving as the drain port of the bathtub of the second mold is so arranged that the trace of the air injection valve as a protruding pin does not remain on the surface side of the bathtub. It is preferable to provide an air press-in hole provided with an air press-in valve. The first
It is preferable that the above-mentioned air press-fitting valves provided in the second mold and the second mold are operated in the range of the protrusion size smaller than the thickness of the molded product.

[0015] Deaeration holes provided in the first mold for deaeration from the cavity are provided at a few places at the bottom part of the bathtub of the first mold and at one part at each side part of the bathtub. Two vents are provided at the four corners on the upper edge and back side of the bathtub as necessary, and the deaeration holes suck and deaerate the air in the cavity before injecting the resin composition, thereby removing the molded product. It is an air pressure inlet when molding.

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a casting mold apparatus according to the present invention will be described below in detail with reference to FIG.

FIG. 1A is a longitudinal sectional view of an embodiment of a casting mold apparatus according to the present invention, and FIG. 1B is a view showing a portion P (a lower mold drain port portion) shown in FIG. FIG. 3 is an enlarged cross-sectional view of an air injection valve).

In FIG. 1A, a bathtub casting apparatus 10 includes an upper mold 11 and a lower mold 12. The upper mold 11 has an inner surface 13 having a shape corresponding to the shape of the product back side of the bathtub as the target product. On the other hand, lower mold 12
Has an inner surface 14 having a shape corresponding to the shape of the product surface side of the bathtub. By combining the upper mold 11 and the lower mold 12, a cavity 15 corresponding to the shape of the bathtub is formed between the inner surfaces 13 and 14. A gasket 16 is disposed between the upper mold 11 and the lower mold 12 at a position corresponding to the upper edge surface of the bathtub.

The lower die 12 is configured to be moved up and down by driving means (not shown), and the upper die 11 is also configured to be moved up and down as needed.

The inner surface 13 of the upper die 11 has two portions at the portion corresponding to the bottom portion of the bathtub and one portion at the portion corresponding to the side portion on the short side of the bathtub.
7 is formed, and each of the deaeration / air injection holes 17 merges into one. The other opening of the merged deaeration / air injection hole 17 is formed on the outer surface of the upper mold 11. An opening of the deaeration / air press-in hole 17 is connected to a deaeration / air press-in line 18. The deaeration / air press-in line 18 is connected to deaeration means and air press-in means (not shown). It is connected.

The inner surface 13 of the upper mold 11 has, for example, one or two places each on both sides in the longitudinal direction from the center of the bottom of the bath tub, one place in this embodiment, and 4 of the upper rim of the bath tub.
One opening of the air press-in hole 19 is provided at each of the corners.

These air press-in holes 19 merge into one,
The other opening of the merged air press-in hole 19 is formed on the outer surface of the upper mold 11. The other opening of the air press-in hole 19 is connected to an air press-in line 20, and the air press-in line 20 is connected to air press-in means (not shown).

At the openings formed on the inner surface 13 side of the plurality of air injection holes 19 as described above, air injection valves 21 are provided as shown in FIG. 1B. The air pressure injection valve 21 is constituted by a similar substantially inverted cone-shaped protruding pin corresponding to the substantially inverted cone shaped air pressure inlet 22 provided at the opening of the air pressure injection hole 19.

The air pressure valve 21 is normally fitted to the air pressure inlet 22 and is closed. Air press-in hole 19
When the air is press-fitted from above, the air press-fitting valve 21 protrudes toward the cavity 15 and forms a gap 23 with the air pressure inlet 22. Then, air is pressed into the cavity 15 through the gap 23 from a slit (not shown) provided at the base of the air press-in valve 21. In addition, it is preferable that the protrusion L of the air press-fit valve 21 toward the cavity shown in FIG. 1B be operated in a range smaller than the thickness of the bathtub.

On the other hand, as shown in FIGS. 1 (a) and 1 (b), the inner surface 14 of the lower mold 12 has one opening of the air press-in hole 24 at a position corresponding to the drain port of the bathtub. Are formed. The other opening of the air injection hole 24 is
It is formed on the outer surface of the lower mold 12. The other opening of the air press-in hole 24 is connected to an air press-in line 25, and this air press-in line 25 is connected to an air press-in means (not shown).

As described above, as shown in FIG. 1B, an air press-in valve 21 is provided at an opening of the air press-in hole 24 formed in the lower die 12 on the cavity 15 side.

The lower mold 12 has an injection port 26 for communicating the cavity 15 with the outside of the lower mold 12, and an injection device (not shown) is connected to the injection port 26.

Using the casting apparatus 10 having the above-described structure, the bathtub is formed as follows.

First, a back reinforcing layer is mounted between the inner surface 13 of the upper die 11 and the inner surface 14 of the lower die 12 with the die opened. Next, the air in the cavity 15 is suctioned and deaerated by the deaeration means through the deaeration / air injection pipe 18 and the deaeration / air injection hole 17, and the back reinforcing layer is placed on the inner surface 13 side of the upper mold 11. Suction and adhere.

In this state, the upper mold 11 and the lower mold 12 (in the embodiment, the lower mold 12 is raised to the upper mold 11 side and the mold is clamped) are closed to form the cavity 15. Next, a resin composition such as a thermosetting vinyl ester resin composition is injected into the cavity 15 through an injection port 26 by an injection device.
Inject into. After curing the resin composition, the lower mold 12 is cooled to cool the upper mold 11 and the lower mold 12.

After the upper mold 11 and the lower mold 12 are cooled, air is supplied to the air press-fitting holes 24 formed in the lower mold 12 via the air press-fitting pipe 25 by the air press-fitting means. As a result, the air injection valve 21 is operated to protrude toward the cavity 15, and air flows through the gap 23 created between the air injection valve 21 and the air pressure inlet 22 provided at the opening of the air injection hole 24. 12 between the inner surface 14 and the product surface of the molded article. As a result, the molded product is released from the lower mold 12, and the molded product is left on the inner surface 13 side of the upper mold 11.

Next, air is supplied to a plurality of air injection holes 19 formed in the upper mold 11 through an air injection pipe 20 by an air injection means. As a result, the air press-in valve 21 is operated to protrude toward the cavity 15, and the air press-in valve 2
Air is press-fitted between the inner surface 13 of the upper mold 11 and the product surface of the molded product through a gap 23 generated between the first die 1 and the air pressure inlet 22. As a result, the molded product is released from the upper die 11.
The demolded molded product is pulled out from between the upper mold 11 and the lower mold 12 in parallel. At this time, if the molded product cannot be smoothly removed from the upper mold 11, air should be forcibly injected from the deaeration / air injection hole 17 formed in the upper mold 11 by the air injection means. Assists demolding.

As described above, according to the casting mold apparatus 10 according to the embodiment of the present invention, a plurality of air press-in holes 19 are provided in the upper mold 11 on the back side of the product. In each opening of the hole 19 on the cavity 15 side,
An air pressure valve 21 is provided. Also, the openings of the respective air press-in holes 19 on the cavity 15 side are provided apart from each other. Therefore, when air is supplied to the air injection hole 19 and the air is injected by operating each of the air injection valves 21, the air flows evenly between the inner surface 13 of the upper mold 11 and the molded product. Easy to type. As a result, it is possible to easily and reliably release the mold from the upper mold 11, and there is almost no need to remove the molded product from the mold by hand using a tool without good release. The time required for demolding can be greatly reduced.

Further, in this embodiment, a plurality of deaeration / air press-in holes 17 are provided in the upper die 11 on the back side of the product. For this reason, these deaeration / air pressure holes 17
By performing degassing through the through hole, the back surface reinforcing layer can be firmly adhered to the inner surface 13 of the upper mold 11 during resin injection. Further, if the removal of the molded product from the upper mold 11 is not smooth, the air is forcibly injected from the deaeration / air injection hole 17 formed in the upper mold 11 by the air injection means. The mold release can be assisted by the air injection hole 19. As a result, the required release time can be further reduced. However, the deaeration / air injection hole 17 may be connected only to the deaeration means for simply performing the deaeration, and may be used only as the deaeration hole.

The present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the gist of the present invention. For example, in the above embodiment, only the upper die 11 is provided with a plurality of air injection holes 19, but similarly, the lower die 12 is provided with a plurality of air injection holes 24 having air injection valves at their openings.
Is provided, the molded product from the lower mold 12 can be easily and reliably released. Upper mold 11 and lower mold 1
By providing a plurality of air press-in holes 19 and 24 in each of 2 in such a manner as to be separated from each other, it is possible to easily release the molded product from the upper mold 11 and the lower mold 12, so that the time required for the entire casting is required. Can be greatly reduced.

In the embodiment, the air injection valve 21
Although it was made to protrude to the cavity side by the air press-fitted into the air press-fitting hole, the present invention is not limited to this.
When molding is completed and the mold is opened, the spring is pushed and the air injection valve opens, and at the same time, the air pressed into the air injection hole is passed between the mold and the molded product through the slit provided at the base of the air injection valve. It can also be made to flow in and release.

Further, although the casting mold apparatus for casting a bathtub has been described, it can be used for manufacturing other types of containers such as a basin for a wash basin. The effect can be obtained.

[0038]

As described above, according to the first aspect of the present invention, the first mold is provided with a plurality of pneumatic injection holes having pneumatic injection valves at the openings thereof and is spaced apart from each other. Since the air press-fitted from the air injection valve uniformly flows between the first mold and the molded product, the molded product can be easily and reliably removed from the mold. As a result, insufficient removal of the mold is prevented, and the time required for removal of the mold is greatly reduced.

According to the second aspect of the present invention, since a plurality of deaeration holes are provided apart from each other, the back reinforcing layer is attached to the first mold during casting, and these deaeration holes are removed. In the case of degassing via, the adhesion between the back reinforcing layer and the first mold can be improved.

Further, according to the third aspect of the present invention,
Since air can be press-fitted between the first mold and the molded product via the deaeration hole at the time of demolding, it is possible to assist demolding of the molded product from the first mold.

[Brief description of the drawings]

FIG. 1 (a) is a longitudinal sectional view showing one embodiment of a casting mold apparatus according to the present invention, and FIG. 1 (b) is a section P (air press-fitting of a lower mold drain port portion) shown in FIG. 1 (a). FIG.

[Explanation of symbols]

10 ... mold apparatus for casting molding 11 ...
Upper mold 12 ... Lower mold 13,14 ...
Inner surface 15 ... Cavity 16 ...
Gasket 17: Deaeration / air injection hole 18 ...
Pipes for deaeration and air injection 19, 24 ... Air injection holes 20, 25 ...
Air press-in pipe 21 ... Air press-in valve 22 ...
Air pressure inlet 23 ... Gap 26 ...
Inlet

Claims (3)

[Claims] A first mold having an inner surface having a shape corresponding to a shape on a back surface side of the product; a second mold having an inner surface having a shape corresponding to a shape on a front surface side of the product; An injection port for injecting the resin composition into a cavity formed by the inner surface of the mold and the second mold; and a deaeration hole provided at a plurality of locations of the first mold for deaeration from the cavity. An air injection hole provided in the first mold at a plurality of locations and spaced apart from each other for injecting air into the cavity, and an opening of the air injection hole provided in at least one location in the second mold; And a pneumatic injection valve protruding toward the cavity by air press-fitted into the pneumatic injection hole. 2. The casting mold apparatus according to claim 1, wherein a plurality of deaeration holes are provided apart from each other. 3. The casting mold apparatus according to claim 1, wherein air can be press-fitted from the deaeration hole.