JPH0857895A - Injection molding device, injection unit and mold clamping unit - Google Patents

Abstract

(57) [Summary] [Purpose] It is possible to change the clamping direction of the mold with respect to the injection direction of the molding material, and to perform the changing work easily. [Structure] An injection molding device 40 is configured by connecting an injection unit 41, a mold clamping unit 42, and a control unit 43. The mold clamping unit 42 includes the movable die plate 23.
A connecting portion 63 for connecting the injection unit 41 is provided at each of the end portion in the moving direction and the end portion in the direction orthogonal to the moving direction. The ejection unit 41 can be floated from the installation surface by an air ejection mechanism 45 provided on the bottom surface of the pedestal 44. Float and move the injection unit 41,
The connection direction with the mold clamping unit 42 is changed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an injection molding apparatus used for injection molding processing of plastics and the like.

[0002]

2. Description of the Related Art An example of a conventional injection molding apparatus of this type is shown in FIG. A movable base 12 that is movable in the longitudinal direction on the upper surface 11a is installed on one half of the upper surface 11a of the gantry 11 in the longitudinal direction, and a drive unit 13 and a driving source 14 for injection are installed on the movable base 12. To be done. An injection cylinder 15 is attached to the drive unit 13 so as to project toward the center of the upper surface 11a in the longitudinal direction, and a material hopper 16 is attached to the upper portion of the injection cylinder 15 on the drive unit 13 side.
A heater 17 is attached to the peripheral surface of the injection cylinder 15 excluding the upper portion.

In this example, a drive source 14 is provided with a hydraulic pump, a drive unit 13 is provided with a hydraulic cylinder, and a screw (not shown) connected to the piston is provided.
Is provided in the injection cylinder 15. A plate surface faces the nozzle 18 at the tip of the injection cylinder 15, and a fixed die plate 19 is erected upright in a substantially central portion of the upper surface 11a. It is erected on the department side. The fixed die plate 19 and the support base 21 have a substantially rectangular plate shape. Both ends are supported at their four corners, and the four tie bars 22 extending in the longitudinal direction of the upper surface 11a are fixed die plates 19 and It is arranged and fixed between the supports 21. A moving die plate 23, which has four corners penetrating through them and is positioned and supported, is attached to the four tie bars 22 so as to be movable in the axial direction thereof.

The fixed die plate 19 and the movable die plate 23 are each formed with a plurality of taps (not shown) for fixing the die, and the fixed die plate 19 is also provided.
A through hole (not shown) through which the nozzle 18 of the injection cylinder 15 is inserted is formed in the central portion of the. The mold clamping drive unit 24 is inserted into a mounting hole formed in the support base 21 and mounted and supported by the support base 21. A hydraulic cylinder is arranged in the drive unit 24 similarly to the drive unit 13 on the injection side. The drive source (hydraulic pump) of this hydraulic cylinder is shared by the drive source 14 on the injection side.

A fixed plate 25 connected to the piston of the hydraulic cylinder is provided on the drive unit 24, and a fixed plate 26 is attached to the movable die plate 23 so as to face the fixed plate 25. When the two fixing plates 25 and 26 are fixed to each other, the moving die plate 23 is driven by the driving unit 24, and the moving die plate 23 is guided by the tie bar 22 and moves in the axial direction thereof.

The moving base 12 on the injection side is connected to a fixed die plate 19 via a moving mechanism 27 and a connecting rod 28. That is, the moving base 12 is attached to the moving mechanism 27 that engages with the connecting rod 28 and moves in the axial direction thereof, and the tip of the connecting rod 28 is attached and fixed to the fixed die plate 19. Therefore, the movable base 12 can be moved with the fixed die plate 19 as a reference. The moving mechanism 27 and the connecting rod 28 are composed of a hydraulic cylinder and a shaft attached to its piston.

A control unit for driving and controlling each drive unit is housed in the gantry 11, and its control panel 29 is arranged on the front surface of the gantry 11. Level pad 3 for installation on the bottom of the gantry 11
1 is attached. As shown in FIG. 4A, a rail 32 is arranged along the front edge of the upper surface 11a of the gantry 11, and a door 33 that moves along the rail 32 is provided. During the injection molding operation, the door 33 is located in front of both die plates 19 and 23 for safety measures. 4B shows the rail 32 and the door 33 omitted, and in FIG. 4A, the frame for supporting the door 33 is also omitted.

The hole portion 34 penetrating the gantry 11 in the front-rear direction has an opening 3 formed in the upper surface 11a.
5, which is a tray (not shown) for receiving the injection-molded product falling through the opening 35.
It is placed at 4. The injection molding process by the injection molding device 36 configured as described above is performed by attaching one of the pair of molds to the fixed die plate 19 and the other to the moving die plate 23, and moving the moving die plate 23 by the drive unit 24. Then, the two molds are combined and tightened, and the injection material is injected into the mold by the injection cylinder 15.

[0009]

As described above, in the conventional injection molding apparatus 36, the moving die plate 2 is used.
The direction of clamping the mold by 3 corresponds to the injection direction of the molding material from the injection cylinder 15, and since the moving direction of the moving die plate 23 and the direction of the injection cylinder 15 are both fixed, the injection of the molding material is performed. It was impossible to change the mold clamping direction with respect to the direction.

Therefore, even if it is necessary to clamp the mold in the direction orthogonal to the injection direction of the molding material in view of the shape and quality of the molded product, it cannot be carried out. It is inconvenient, and good injection molding cannot be performed. An object of the present invention is to eliminate the drawbacks of the prior art, to enable selection of the mold clamping direction with respect to the injection direction of the molding material, and to change the clamping direction with respect to the injection direction very easily. An object is to provide an apparatus, and further to provide an injection unit and a mold clamping unit used in the injection molding apparatus.

[0011]

According to the invention of claim 1, an injection unit having an injection cylinder and a drive unit for driving the injection cylinder mounted on a mount, a fixed die plate, and a movable die. A plate and a mold clamping unit in which a drive unit for moving the moving die plate is mounted on a pedestal, and an injection unit and a control unit that sends an operation signal to the mold clamping unit are connected to each other to form an injection molding apparatus. The mold clamping unit is configured such that the mold clamping unit has one end in the moving direction of the moving die plate and one end in the direction orthogonal to the moving direction, and a connecting part to which the injection unit is connected. It can be floated by an air ejection mechanism provided on the bottom of the frame.

According to the second aspect of the present invention, an injection cylinder, an injection unit in which a drive unit for driving the injection cylinder is mounted on a pedestal, a fixed die plate, a movable die plate, and the movable die plate are provided. An injection molding apparatus is configured by connecting a mold clamping unit having a drive unit to be moved mounted on a pedestal and a control unit that sends an operation signal to the injection unit and the mold clamping unit, and the mold clamping unit moves. At one end in the moving direction of the die plate and at one end in the direction orthogonal to the moving direction,
Each of them has a connecting portion to which the injection unit is connected, and can be floated by an air ejection mechanism provided on the bottom surface of the gantry.

According to the invention of claim 3, claims 1 and 2
In the invention, the injection unit extends in the same direction as the injection cylinder, and a connecting rod having a tip fixed to the connecting portion of the mold clamping unit, and a moving mechanism that engages with the connecting rod and moves in the axial direction thereof. And a moving base attached to the moving mechanism, the moving base is movably arranged on a pedestal, and the injection cylinder and the drive unit are mounted on the moving base.

According to the invention of claim 4, the injection unit comprises an injection cylinder and a drive unit for driving the injection cylinder, which is mounted on a pedestal, and can be floated by an air ejection mechanism provided on the bottom surface of the pedestal. To be done. According to the invention of claim 5, the mold clamping unit includes a fixed die plate, a movable die plate, and a drive unit for moving the movable die plate, which is mounted on a pedestal. It is floatable by the mechanism.

[0015]

FIG. 1 shows an embodiment of the present invention. The parts corresponding to those in FIG. 4 are designated by the same reference numerals, and the description thereof will be omitted. In this invention, the injection molding device 40 is the injection unit 4
1, the mold clamping unit 42 and the control unit 43 are connected to each other. The injection unit 41 is a unit for injecting a molding material, and the movable base 12 is movably arranged on the upper surface 44a of the frame 44, and the drive unit 13 and the drive source 14 for injection are mounted on the movable base 12. An injection cylinder 15 is attached to the drive unit 13. Injection cylinder 1
The extending direction of 5 and the moving direction of the moving base 12 are parallel to each other. A pair of connecting rods 28 extending in the moving direction are attached to the moving base 12 via moving mechanisms 27, respectively. As shown in FIG. 1A, the pair of moving mechanisms 27 are located on both sides of the injection cylinder 15 and are attached to the moving base 12.

An air ejection mechanism 45 is provided at each of four corners of the bottom surface of the pedestal 44. FIG. 2 shows this air ejection mechanism 45.
2 shows the detailed structure of. A rectangular plate-shaped base 46 is attached to the corners of the bottom surface of the frame 44 with screws 47, and a disk-shaped back plate 48 is attached to the base 46 with screws 49. The accumulation pad 5 is provided on the surface of the back plate 48 opposite to the surface facing the base 46.
1 is attached by adhesion. The accumulation pad 51 is, for example, a donut-shaped hollow body made of rubber or the like, and has a small hole 51a formed on the bonding surface with the back plate 48.
On the other hand, an annular hole 51c is formed on the surface opposite to the central hole 51b so as to be concentric therewith. Accumulation pad 51
A disc-shaped control pad 52 is arranged on the surface of the annular hole 51c of the center pad 5 on which the center pad 5 is formed.
3 will be placed. The control pad 52 has a large number of through holes 52a formed on its circumference so as to face the annular hole 51c of the accumulation pad 51. The center pad 5
3 is attached and fixed to the back plate 48 and the base 46 via the control pad 52 and the accumulation pad 51 by a bolt 54 inserted through the central axis thereof.

Through holes 46a and 48a are formed in the base 46 and the back plate 48, respectively, and the hollow inside of the accumulation pad 51 and the coupler 55 attached to one side portion of the base 46 are formed through the small holes 51a. The through holes 46a and 48a communicate with each other. Coupler 55
A hose 56 is attached to the hose 56, and the other end of the hose 56 is connected to a compressed air delivery source (not shown) such as a compressor. Incidentally, reference numeral 57 in FIG. 2 is a packing.

The air ejection mechanism 4 having the above structure
When compressed air is supplied to 5, the annular hole 51c of the accumulation pad 51 and the through hole 52 of the control pad 52
Compressed air is radially ejected from between the control pad 52 and the center pad 53 through a (see FIG. 2).
Arrows indicate the flow of air). Therefore, 4 on the bottom of the mount 44
If compressed air is supplied to each of the air ejection mechanisms 45 provided in the corners, the compressed air pressure ejected from the air ejection mechanisms 45 can cause the ejection unit 41 to slightly float above the installation surface.

The mold clamping unit 42 is a unit for mounting a pair of molds and clamping them, and as shown in FIG. 1, a fixed die plate 19 and a fixed die plate 19 are provided on an upper surface 61a of a frame 61 thereof.
A support base 21 that supports the drive unit 24 is provided upright, and a moving die plate 23 is attached to four tie bars 22 arranged between them. In this example, the drive unit 24
Is equipped with a hydraulic cylinder, and the drive source (hydraulic pump) of the hydraulic cylinder is housed in the frame 61.

On the upper surface 61a of the pedestal 61, the ends of the pair of connecting rods 28 of the injection unit 41 are inserted and fixed at the ends on the fixed die plate 19 side in the moving direction of the moving die plate 23. A pair of block-shaped connecting portions 63 having holes 62 are provided, and a pair of connecting portions 63 are similarly provided at the end opposite to the door 33 in the direction orthogonal to the moving direction of the moving die plate 23. Has been. The connection portion 63 and the connection rod 28 are fixed by inserting the tip of the connection rod 28 into the mounting hole 62 and locking them with a pin (not shown), for example. Similar to the injection unit 41, air ejection mechanisms 45 are provided at the four corners of the bottom surface of the gantry 61.

The control unit 43 sends an operation signal to the injection unit 41 and the mold clamping unit 42 to drive and control them, and a controller 64 having a control panel 64a and a display portion 64b is mounted on a pedestal 65. .
A caster 66 is attached to the gantry 65. The controller 64, the injection unit 41, and the mold clamping unit 42 are electrically connected by a cable 67. In FIG. 1, 68 is a connector attached to the end of the cable 67, and 69 is a connector on the unit 41, 42 side.

Next, the injection unit 41 and the mold clamping unit 4
The connection with 2 will be described. When performing injection molding by clamping the mold in the same direction as the injection direction of the molding material from the injection cylinder 15, the injection unit 41 and the mold clamping unit 42.
The arrangement relationship is as shown in FIG. And both mounts 4
4 and 61 are brought close to each other, and the moving base 1 of the injection unit 41
2 is moved to the mold clamping unit 42 side to fix the tips of both connecting rods 28 to the corresponding connecting portions 63 of the mold clamping unit 42. Thereby, the injection cylinder 15 is connected to the connecting portion 63.
It is possible to control the position of the nozzle 18 with respect to the mold clamped by the fixed die plate 19 and the moving die plate 23.

On the other hand, when injection molding is performed by clamping the mold in the direction orthogonal to the injection direction of the molding material, the injection unit 41 is moved so that the positional relationship is as shown in FIG. The movement of the injection unit 41 is easily performed by supplying a small amount of force by supplying compressed air to each air ejection mechanism 45 attached to the pedestal 44 and causing the entire injection unit 41 to float from the installation surface by several mm. be able to.

In this example, the air ejection mechanism 45 is provided in both the injection unit 41 and the mold clamping unit 42. However, in order to change the above-mentioned arrangement of the injection unit 41 and the mold clamping unit 42, either one of them is used. Air ejection mechanism 4 in the unit
5 may be provided and the unit may be moved. If the air ejection mechanism 45 is provided in both the injection unit 41 and the mold clamping unit 42 as in this example, for example, when the entire injection molding device 40 is moved to another place, the injection unit which is a heavy load. 41, mold clamping unit 42
Can be easily moved.

In this example, a hydraulic pump and a hydraulic cylinder are used for each drive source and drive unit of the injection unit 41 and the mold clamping unit 42. For example, instead of these, a servo motor and a ball screw are used. You can also do it.

[0026]

As described above, according to the present invention, the injection unit, the mold clamping unit, and the control unit are connected to each other to form an injection molding apparatus. The injection unit and the mold clamping unit are connected to each other. Can be changed.
This makes it possible to select the mold clamping direction with respect to the injection direction of the molding material, that is, even in the case of molding with a mold that requires clamping in the same direction as the injection direction of the molding material,
Since molding can be performed even with a mold that requires tightening in a direction orthogonal to the injection direction, it is versatile and easy to use.

Further, when the injection unit is moved to change the connection state of the injection unit and the mold clamping unit, the entire injection unit can be levitated from the installation surface by the air ejection mechanism, so that only a slight force is applied. The injection unit, which is a heavy object, can be moved by, and the injection unit can be moved very easily. According to the second aspect of the invention, the mold clamping unit is provided with an air ejection mechanism, and in this case, the connection state between the injection unit and the mold clamping unit can be easily changed by floating the mold clamping unit. it can.

In the conventional injection molding apparatus shown in FIG. 4, for example, replacement of the molding material requires a long time to remove and replace the old material in the injection cylinder and the material hopper, and the molding process is stopped for a long time. I had to do
In this invention, since the injection molding device can be separated into each unit, for example, another injection unit is prepared, and separately from the injection molding device in operation, the molding material to be exchanged is loaded into the injection unit by external setup, and the injection molding device is injected. If the units are connected and exchanged, the molding material of the injection molding apparatus can be exchanged in an extremely short time, and the operating rate can be improved.

Further, by preparing a plurality of mold clamping units having different mold clamping forces and injection units having different cylinder capacities, various molding processes can be performed by combining them.

[Brief description of drawings]

1A is a plan view showing an embodiment of an injection molding apparatus according to the present invention, and FIG. 1B is a front view with a part omitted.

FIG. 2 is an enlarged cross-sectional view showing details of an air ejection mechanism in the embodiment shown in FIG.

FIG. 3 is a view for explaining another connection state of the injection unit and the mold clamping unit.

FIG. 4A is a plan view showing a conventional injection molding apparatus, and B is a front view with a part omitted.

[Explanation of symbols]

 13 Drive Unit 15 Injection Cylinder 19 Fixed Die Plate 23 Moving Die Plate 24 Drive Unit 41 Injection Unit 42 Mold Clamping Unit 43 Control Unit 44 Frame 45 Air Injection Mechanism 61 Frame 63 Connection Part

Claims (5)

[Claims] 1. An injection unit in which an injection cylinder and a drive unit for driving the injection cylinder are mounted on a frame, a fixed die plate, a movable die plate, and a drive unit for moving the movable die plate. Is a mold clamping unit mounted on a gantry, and an injection unit and a control unit that sends an operation signal to the mold clamping unit, the injection molding apparatus comprising: The moving die plate has a connecting portion at one end in the moving direction and at one end in a direction orthogonal to the moving direction, the connecting portion being connected to the injection unit, and the injection unit is provided on the bottom surface of the gantry. An injection molding device characterized by being floatable by an air ejection mechanism. 2. An injection unit having an injection cylinder and a drive unit for driving the injection cylinder mounted on a frame, a fixed die plate, a movable die plate, and a drive unit for moving the movable die plate. Is a mold clamping unit mounted on a gantry, and an injection unit and a control unit that sends an operation signal to the mold clamping unit, the injection molding apparatus comprising: The moving die plate has, at one end in the moving direction and at one end in the direction orthogonal to the moving direction, a connecting portion to which the above injection unit is connected, respectively, and by an air ejection mechanism provided on the bottom surface of the gantry. An injection molding device characterized by being floatable. 3. The injection unit extends in the same direction as the injection cylinder, and a tip of the connecting rod is fixed to a connecting portion of the mold clamping unit, and an axial direction of the connecting rod is engaged with the connecting rod. And a moving base attached to the moving mechanism. The moving base is movably arranged on the pedestal, and the injection cylinder and the driving unit are mounted on the moving base. The injection molding apparatus according to claim 1 or 2, characterized in that. 4. An injection cylinder, and a drive unit for driving the injection cylinder, which is mounted on a pedestal, and can be floated by an air ejection mechanism provided on the bottom surface of the gantry. unit. 5. A fixed die plate, a movable die plate, and a drive unit for moving the movable die plate are mounted on a gantry, and can be floated by an air ejection mechanism provided on the bottom surface of the gantry. A mold clamping unit characterized by being