JP3031783B2 - Resin molding machine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a resin molding machine capable of performing both compression molding and injection molding.

[0002]

2. Description of the Related Art As a resin molding machine, an SMC (sheet mold compound) compression molding machine (for example, Japanese Patent Publication No. 51-269)
43, JP-A-60-15119, JP-B3-71960, etc.), BMC (bulk mold compound)
Injection molding machine (for example, see Japanese Utility Model Publication No. 1-36590),
And a BMC injection compression molding machine (for example, see JP-A-60-8021)
Reference).

[0003] Each of the above molding machines is composed of SMC compression molding, BMC
It was a dedicated machine with a dedicated press operation, incorporating dedicated equipment units for injection molding and BMC injection compression molding, respectively.

[0004]

The above-mentioned various molding machines are:
Since it was dedicated to it, it was costly to install each dedicated machine in the case of large-scale small-lot production.
Then, an object of the present invention is to provide a resin molding machine which can perform various kinds of resin molding with one machine.

[0005]

In order to achieve the above object, the present invention takes the following measures. That is, the features of the present invention include a movable slide in which a compression mold and an injection mold can be interchangeably mounted, and a drive in which the speed and pressing force of the slide can be adjusted. Device, a press device including a control device for controlling the driving device,
A charging device for supplying a resin material to the compression molding die, and an injection device for supplying a resin material to the injection molding die, wherein the control device performs injection in a compression mode when performing compression molding. When molding, depending on the injection mode,
And, when the injection compression molding is in that it is configured to control the driving device by an injection compression mode. So
Then, in each of the modes, the control device performs a slide operation.
Speed when moving from the up position to the down position
Is in the lowered position, the pressing force should be increased from the lowered position.
When moving to the ascending position, control the speed and
In the compression mode, the pressure is controlled so as to change.
In the injection mode, the pressing force is constant.
In the injection compression mode, the pressing force is
Configured to be applied once the slide has been raised
Have been.

[0006]

In the following description, a vertical press device will be described, but the present invention is also applied to a horizontal press device. First, when compression molding an SMC material, a compression molding die is attached to a press device, and a charging device is attached. The mold includes a pair of upper and lower molds, and the upper mold is mounted on a slide.

[0007] The slide is stopped at the raised position, and a material insertion space is formed between the upper and lower molds. Then, a resin material (SMC) is inserted between the upper and lower molds by the charging device, and is placed on the lower mold. The resin material is plate-shaped, and its shape is determined and measured according to the size of the product. When the material is placed on the lower mold, the slide starts to descend by the driving device. The descent speed and the pressing force of the driving device are controlled by the control device. The control device is
The driving device is controlled by the compression molding press operation, that is, the compression mode.

That is, the compression mode performs the following operation. Slides are fast, medium and slow until the upper mold contacts the material.
It descends with the speed changing sequentially with the low speed. When the upper mold presses the material and the material fills the cavity of the mold, the slide compresses the material at a predetermined pressure. At this time, since the resin (SMC) to be compression-molded is a thermosetting resin, the predetermined pressure is controlled so that the resin pressure in the mold changes according to the curing. When the material is compression-molded into a predetermined shape in the mold, the slide rises by sequentially changing the speed at a low speed, a medium speed, and a high speed.

Next, when injection molding a BMC material,
An injection mold is attached to the press device in place of the compression mold, and an injection device is attached. The mold includes a pair of upper and lower molds, and the upper mold is mounted on a slide. The slide is initially stopped at the raised position and starts to descend by the drive. The descent speed and the pressing force of the driving device are controlled by the control device. The control device controls the drive device in an injection mode based on a compression molding press operation.

That is, the injection mode performs the following operation. The slide is closed until the upper mold closes to the lower mold and closes the mold.
The speed changes sequentially from high speed, medium speed, and low speed to descend. When the upper and lower molds come into close contact with each other, the upper and lower molds maintain the close contact state at a predetermined pressure, and a resin material is injected into the mold cavity at a high pressure by an injection device. When the resin material fills and solidifies in the cavity of the mold, the slide rises at a low speed, a medium speed, and a high speed sequentially.

Next, when the BMC material is subjected to injection compression molding, the equipment configuration is the same as in the case of the injection molding. The slide is initially stopped at the raised position and starts to descend by the drive. The descent speed and the pressing force of the driving device are controlled by the control device. The control device controls the driving device in an injection compression mode based on a compression molding press operation.

That is, the following operation is performed in the injection compression mode. The slide descends at a high speed, a medium speed, and a low speed sequentially until the upper mold is in close contact with the lower mold and is clamped.
When the upper and lower molds come into close contact with each other, the slide slightly rises, and a resin material is injected into the mold cavity by the injection device. When the resin material fills the cavity of the mold, the slide is pressed down at a predetermined pressure. When the resin in the mold is solidified, the slide gradually rises at a low speed, a medium speed, and a high speed and rises.

[0013]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows the device configuration when the SMC material is compression molded, and FIG. 2 shows the device configuration when the BMC material is injection molded or injection compression molded.

The resin molding machine of the present invention has a press device 1. The press device 1 has a bed 2, uprights 3 erected at four corners of the bed 2, and a crown 4 for connecting and fixing the upper ends of the four uprights 3. A slide 5 is attached to the upright 3 so as to be movable up and down. Slide 5 and the upright
Between the three, a position detecting device 6 for detecting the moving position of the slide 5 is provided. This position detecting device 6 is composed of a linear scale, an encoder, and the like.

A compression mold 7 (see FIG. 1) and an injection mold 8 (see FIG. 2) are interchangeably mounted on the bed 2 and the slide 5. Each of the molds 7,
8 is an upper mold that is detachably attached to the slide 5.
And a lower mold 10 detachably attached to the bed 2. A resin molding cavity 11 is formed on the mating surfaces of the upper and lower dies 9, 10. A resin supply path 12 for injecting resin into the cavity 11 is opened in the lower mold 10 for injection molding. Each of the lower molds 10 is provided with a pressure sensor 13 for detecting a resin pressure in the cavity 11.

A driving device 14 for raising and lowering the slide 5 is provided. The driving device 14 includes a main cylinder 15 provided at the center of the crown 4, and a sub-cylinder 16 provided on the crown 4 on both sides of the main cylinder 15.
It comprises a plurality of equilibrium cylinders 17 provided on the bed 2 and a hydraulic unit 18 for supplying hydraulic oil to the main, sub and equilibrium cylinders 15, 16, 17.

The piston rods of the main cylinder 15 and the sub-cylinder 16 are connected and fixed to the upper surface of the slide 5. The piston rod of the balancing cylinder 17 abuts on the lower surface of the slide 5 so as to be able to freely contact and separate. The driving device 14
Is provided with a control device 19 for controlling the control. The control device 19 is electrically connected to the hydraulic unit 18, the position detection device 6, and the pressure sensor 13.

The control device 19 has a timer. Based on the timer and data detected by the position detection device 6,
It is configured to be able to calculate the position of the slide 5 and its moving speed. Further, the balance of the slide 5 can be determined based on the data detected by the position detecting device 6. Further, the hydraulic pressure of each of the cylinders 15, 16, 17 is detected to determine the pressing force of the slide 5 on the mold.

Further, the control device 19 is configured to be capable of setting and inputting a compression mode, an injection mode, and an injection compression mode. By switching to each mode, the control device 19 controls the drive device 14 according to the mode. Have been. Each of these modes will be described later. A mold table 20 is arranged on the side of the press device 1. A charging device 21 (see FIG. 1) and an injection device 22 (see FIG. 2) are interchangeably mounted on the mold table 20.

The charging device 21 has a predetermined size S
The MC material 23 is supplied into the compression molding die 7.
The injection device 22 is a mold for injection molding a molten BMC material.
8 to be supplied. Next, a case where the SMC material 23 is compression-molded will be described. First, when the SMC material 23 is compression-molded, the compression molding die 7
Is attached, and the charging device 21 is attached (see FIG. 1).

The press device 1 is controlled by a compression mode. The compression mode will be described with reference to FIG.
In the figure, S1 to S7 indicate respective steps in the compression mode. Slide 5 is waiting at the top dead center position. In this state, the charging device 21 puts the SM on the lower mold 10.
C material 23 is supplied.

In step S1, hydraulic oil is supplied from the hydraulic unit 18 to the main cylinder 15 and the sub-cylinder 16 according to a command from the control device 19, and the slide 5 starts to descend at a high speed. At this time, since the capacity of the main cylinder 15 is large, hydraulic oil is also supplied to the main cylinder 15 from a full tank (not shown). The speed control of the slide 5 is controlled by the supply amount of hydraulic oil to the sub cylinder 16.

In step S2, the slide 5 descends at a medium speed. The switching of the steps is performed by detecting the moving position of the slide 5 by the timer or the position detecting device 6. In step S3, the slide 5 descends at a low speed, and the slide 5 is supported by the balancing cylinder 17. In this step, slide 5 moves
The speed is controlled by the sub-cylinder 16 to decelerate in multiple stages, and the leveling is controlled by the balancing cylinder 17,
Descend maintaining equilibrium. At the end of this step, the clamping of the upper and lower molds 9 and 10 is completed, the cavity 11 is filled with the SMC material 23, and the cavity internal pressure rises. This pressure increase is detected by the pressure sensor 13, and when the internal pressure reaches a predetermined pressure, the process is switched to the next step S4.

Incidentally, this step switching may be performed by a timer, a position detecting device 6, or a cylinder internal pressure detecting device instead of the pressure sensor 13. In step S4, the slide 5 is pressed by pressure control and leveling control instead of the speed control. Pressure control is
This is performed by controlling the hydraulic oil supply pressure to the main cylinder 15. This pressure control is performed in multiple stages by the detection result of the pressure sensor 13 and the cylinder pressure detecting device or by a timer. In this step, the material 23 in the cavity 11 is
Is compression molded into a predetermined shape.

In step S5, the slide 5 is slightly raised while the balance is maintained by the balance cylinder 17. This rising amount is controlled by a timer or the position detecting device 6. As the slide 5 is raised, a predetermined gap is formed between the compression molded product and the inner surface of the mold cavity, and the gap is coated with in-mold. When the in-mold coating is performed, the slide 5 descends under speed control and leveling control. After descending to the predetermined position, the next step S6
Is switched to. This step switching is performed by the timer, the position detecting device 6, the pressure sensor 13, or the cylinder pressure detecting device.

In step S6, the slide 5 is subjected to the same pressure control as in step S4, and all compression molding including the in-mold coating is completed. Step S7
, The slide 5 rises at a low speed, a medium speed, and a high speed by speed control, stops at the original top dead center position, and ends all the processes in the compression mode. In the compression molding, the in-mold coating may not be performed. In some cases, the balancing cylinder 17 is not used.

Next, a case where a BMC material is injection-molded will be described. When the BMC material is compression molded, the injection molding die 8 is attached to the press device 1 and
The injection device 22 is mounted (see FIG. 2). Press equipment 1
Is controlled by the injection mode. The injection mode will be described with reference to FIG. Since this injection mode includes the basic operation of the compression mode, S1, S2, and S7 in the figure are the same as those in the compression mode.

In step S1, hydraulic oil is supplied from the hydraulic unit 18 to the main cylinder 15 and the sub-cylinder 16 according to a command from the control device 19, and the slide 5 waiting at the top dead center position descends at high speed. To start. At this time,
Since the capacity of the main cylinder 15 is large, hydraulic oil is also supplied from a full oil tank (not shown). The speed control of the slide 5 is controlled by the supply amount of hydraulic oil to the sub cylinder 16.

In step S2, the slide 5 descends at a medium speed. The switching of the steps is performed by detecting the moving position of the slide 5 by the timer or the position detecting device 6. In step S3 ', the slide 5 descends at a low speed and at multiple speeds. Note that the balance cylinder 17 is not used in injection molding. At the end of this step, the upper and lower dies 9, 10 are in close contact.

In step S4 ', slide 5
Pressed by pressure control. Pressure control for main cylinder 15
This is done by controlling the hydraulic oil supply pressure to the engine. In this step, a molten BMC material is injected into the mold cavity 11 at a high pressure by the injection device 22. After the lapse of a predetermined time, the material in the cavity is cured, the injection molding is completed, and the process is switched to the next step S7.

In step S7, the slide 5 rises at a low speed, a medium speed, and a high speed by speed control, stops at the original top dead center position, and ends all the processes in the injection mode. next,
The case where the BMC material is subjected to injection compression molding will be described.
The device configuration at this time is the same as that at the time of the injection molding. The press device 1 is controlled in an injection compression mode.

The injection compression mode will be described with reference to FIG. In step S1, hydraulic oil is supplied from the hydraulic unit 18 to the main cylinder 15 and the sub-cylinder 16 according to a command from the control device 19, and the slide 5 waiting at the top dead center starts descending at high speed. At this time, since the capacity of the main cylinder 15 is large, hydraulic oil is also supplied from a full oil tank (not shown). The speed control of the slide 5
It is controlled by the supply amount of hydraulic oil to the sub cylinder 16.

In step S2, the slide 5 descends at a medium speed. The switching of the steps is performed by detecting the moving position of the slide 5 by the timer or the position detecting device 6. In step S3, the slide 5 descends at a low speed, and the slide 5 is supported by the balancing cylinder 17. In this step, slide 5 moves
The speed is controlled by the sub-cylinder 16 to decelerate in multiple stages, and the leveling is controlled by the balancing cylinder 17,
Descend maintaining equilibrium. At the end of this step, the upper and lower dies 9, 10 are closed, and the next step S5
Is switched to.

In step S5, the slide 5 is slightly raised while the balance is maintained by the balance cylinder 17. This rising amount is controlled by a timer or the position detecting device 6. When the upper mold 9 rises by a predetermined amount, the injection device 22 injects a molten BMC material into the mold cavity 11. When the material is injected, the slide 5 descends under speed control and leveling control. When it has descended to the predetermined position, it is switched to the next step S6. This step switching is performed by the timer, the position detecting device 6, the pressure sensor 13, or the cylinder pressure detecting device.

In step S6, the slide 5 is pressed by pressure control and leveling control instead of the speed control. The pressure control is performed by controlling the hydraulic oil supply pressure to the main cylinder 15. This pressure control is performed in multiple stages by the detection result of the pressure sensor 13 and the cylinder pressure detecting device or by a timer. In this step,
The material in the cavity 11 is injection-compressed into a predetermined shape. Then, the process is switched to the next step S7.

In step S7, the slide 5 rises at low speed, medium speed, and high speed under the speed control, stops at the original top dead center position, and ends all the processes in the injection compression mode.
Incidentally, when the slide is lowered to the position of S2 or S3, by adding a control circuit for detecting the position and outputting an injection command signal based on the detected position, injection compression molding plus in-mold coating is also possible.

The compression mode, the injection mode, and the injection compression mode are set in the control device 19 in advance, and the control device 19 is configured to be able to use by switching to a predetermined mode. The present invention is not limited to the embodiment described above. For example, the pressing device 1 may be a horizontal type, may not have the balancing cylinder 17, and may be a charging device. Instead of making the injection device 21 and the injection device 22 interchangeable, both may be provided simultaneously.

[0038]

According to the present invention, three types of molding, compression molding, injection molding, and injection compression molding, can be performed with one machine, and the equipment cost can be reduced.

[Brief description of the drawings]

FIG. 1 shows an embodiment of the present invention and is a configuration diagram of a resin molding machine when performing compression molding.

FIG. 2 shows an embodiment of the present invention and is a configuration diagram of a resin molding machine when performing injection molding or injection compression molding.

FIG. 3 is an explanatory diagram of a compression mode.

FIG. 4 is an explanatory diagram of an injection mode.

FIG. 5 is an explanatory diagram of an injection compression mode.

[Explanation of symbols]

 1 Press device 5 Slide 7 Compression molding die 8 Injection molding die 14 Drive unit 19 Control unit 21 Charging unit 22 Injection unit

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int. Cl. ⁷ , DB name) B29C 43/00-43/58 B29C 45/00-45/84

Claims (2)

(57) [Claims] 1. A movable slide in which a compression mold and an injection mold can be interchangeably mounted, a drive device capable of adjusting a speed and a pressing force of the slide, and the drive device. A press device provided with a control device for controlling the compression molding die, a charging device for supplying a resin material to the compression molding die, and an injection device for supplying a resin material to the injection molding die. The resin molding apparatus is configured to control the driving device in a compression mode when performing compression molding, in an injection mode when performing injection molding, and in an injection compression mode when performing injection compression molding. Machine. 2. In each of the modes, the control device moves the slide when the slide moves from the raised position to the lowered position, and when the slide is moved to the lowered position, moves the pressing force from the lowered position to the raised position. When the speed is controlled, in the compression mode, the pressing force is controlled to change, in the injection mode, the pressing force is controlled to be constant, and in the injection compression mode, the pressing force is controlled. The resin molding machine according to claim 1, wherein is provided after the slide is once raised.