JPH0768582A - Stamping molder and stamping molding die - Google Patents

Abstract

PURPOSE:To provide a stamping molder and its molding die wherein a molding cycle can be shortened, a set area of the molder is reduced, and besides investment for plants can be reduced. CONSTITUTION:In a molding die 30 which is arranged between a press surface plate 10 and a base stand 20 in a stamping molder, a first die 31 fitted to the press surface plate 10, a second die 32 arranged on the base stand 20, and a third die 33 which is arranged between the first die 31 and the second die 32, are provided. A first cavity is formed with the first die 31 and the third die 33, and a second cavity is formed with the second die 32 and the third die 33.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a stamping molding apparatus and a stamping molding die for producing a resin molded product by pressing a molten resin between a female mold and a core mold,
In particular, the present invention relates to a stamping molding device and a stamping molding die that shorten the molding cycle.

[0002]

2. Description of the Related Art Conventionally, as one of resin molding methods,
There is known a stamping molding technique capable of supplying molten resin at a low pressure. In this stamping molding technology, a molten resin is injected onto one of the molds that compose the molding die, and while the molten resin is being pressed by the other mold, the resin is molded into the cavity formed by both molds to form a resin molded product. It is a forming technology.

[0003]

However, in the conventional stamping molding technique, since only the molten resin injected into one mold is molded by one pressing, there is a disadvantage that the molding efficiency is poor. Problems like this
This is solved by arranging a large number of molding devices and performing them continuously.

However, since the stamping molding device has a large molded product in the roof portion, door, etc. for automobiles, arranging a large number of devices is not only space-efficient, but also increases capital investment. There is also the inconvenience.

The present invention solves the problems of the above-mentioned conventional techniques, and can shorten the molding cycle, reduce the installation area of the molding apparatus, and reduce the capital investment, and the stamping molding machine and molding. Intended to provide a type.

[0006]

A stamping molding die according to the present invention is a molding die which is disposed between a press surface plate and a base in a stamping molding device, and is a first mold attached to the press surface plate. A mold, a second mold arranged on the base, and a third mold arranged between the first mold and the second mold.
A mold, wherein the first mold and the third mold form a first cavity, and the second mold and the third mold form a second cavity.

Further, the stamping molding apparatus according to the present invention includes a press platen, a base, a mold arranged between the press platen and the base, and a supply for supplying a molten resin to the mold. A stamping molding device including a device, wherein the molding die is a first die attached to the press surface plate,
A second mold disposed on the base, and a third mold disposed between the first mold and the second mold, the press platen and the base being brought into contact with each other. It is composed of a first cavity formed by a first mold and a third mold, and a second cavity formed by a second mold and a third mold, and molten resin is injected from the supply device into the first cavity and the second cavity. After that, the press platen and the base are further clamped by a die.

Further, when the press platen and the third mold are lowered toward the base side, it is preferable that the descending speed of the third mold is 1/2 of the descending speed of the press platen.

[0009]

In the stamping mold according to the present invention, the first mold attached to the press surface plate, the second mold arranged on the base, and the first mold and the second mold are arranged between the first mold and the second mold. The established third
A first cavity is formed by the first die and the third die, and a second cavity is formed by the second die and the third die,
By filling the first and second cavities with the molten resin, a molded product matching the shapes of the first and second cavities is simultaneously molded.

Therefore, in one stamping operation, two molded products are simultaneously molded. As a result, the molding cycle can be shortened, the installation area of the molding apparatus can be reduced, and the capital investment can be reduced.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. The members, arrangements, and the like described below do not limit the present invention and can be variously modified within the scope of the gist of the present invention.

1 to 9 show an embodiment according to the present invention, FIG. 1 is a perspective view of the structure of the apparatus, and FIGS. 2 to 9 are process explanatory diagrams. The stamping molding apparatus S of this example is
The press surface plate 10, the base 20, a molding die 30, a supply device 40 for supplying molten resin to the molding die 30, and a drive device 50 are main components. Further, the stamping molding die 30 of the present example is arranged between the press surface plate 10 and the base 20 in the stamping molding apparatus S.

The press surface plate 10 of this example is a base 2 which will be described later.
0, which is connected to a drive device (not shown), and is connected to a first die 31, a second die 32,
The pressing operation is performed together with the mold clamping with the base 20 via the third mold 33. Then, on the lower surface of the press surface plate 10, a first mold 3 which constitutes a part of a molding mold 30 described later is formed.
1 is provided.

The base 20 of this embodiment receives the press surface plate 10 and is arranged so as to face the press surface plate 10 via a molding die 30 described below. Also, the base 2 of this example
Two support columns 21 are formed on the surface of the support column 0 so as to face each other, and a second die 32 is arranged on the support columns 21.

The molding die 30 of this example is the press platen 10 described above.
The first die 31 attached to the lower surface of the base 20, the second die 32 disposed on the upper surface of the base 20, and the first die 31 and the second die 32.
A third mold 33 arranged between the mold 32 and the mold 32 is a main component.

The first die 31 of this example is a third die 33 which will be described later.
Together with the upper surface mold 35 of the first mold 31 which constitutes a concave cavity having a predetermined shape of a desired molded product.
An abutting portion 31a is provided on the lower surface of the.

The second mold 32 of this example is the base 2 as described above.
It is attached to the support column 21 at the upper part of 0. The second mold 32 constitutes a cavity having a predetermined shape of a desired molded product together with a lower surface mold 34 of a third mold 33 which will be described later.

At a predetermined position on the upper surface of the second die 32, a communication passage 32a penetrating the second die 32 is formed, and a plurality of molten resin ejection ports 32b connected to the communication passage 32a are formed. . The communication passage 32a is connected to the hot runner block 36 attached to the lower surface of the second die 32. The hot runner block 36 is provided with a molten resin passage 36a and is constantly heated by a heating device (not shown) so that the molten resin in the passage 36a is not cured.

A sliding hole 32c for the ejector pin 37 is formed in the second die 32. The ejector pin 37 extends from the sliding hole 32c to release the molded product after molding. An ejector plate 37a is disposed between the second die 32 and the base 20, and the lower surface of the second die 32 and the ejector plate 37 are disposed.
A coil spring 37c is arranged between the coil spring 37a and a.

The ejector pin 37 of this embodiment moves integrally with the ejector plate 37a, and the ejector plate 37a slides up and down by a rod driven by a hydraulic cylinder device 61 (or an air cylinder device), Coil spring 37c
It is configured to be automatically restored by. The operation of the ejector pin 37 is not limited to the above embodiment, and various known techniques can be used.

At the four corners of the second mold 32, a third mold described later is formed.
A slide hole 22b that allows the rod 51 of the hydraulic cylinder device 50 as a drive device to slide in order to slide the die 33.
Are formed.

The third mold 33 of the present embodiment is fixed to the tip end side of the rod 51 of the hydraulic cylinder device 50 arranged on the base 20, and the first mold formed as the lower surface mold 34. A concave cavity mold similar to 31 and an upper mold 35
The core die similar to the second die 32 formed as above is integrally formed. The lower surface mold 34 is the first mold 3 described above.
The third mold 33 is configured to slide up and down by the hydraulic cylinder device 50. The third mold 33 is vertically slid by the hydraulic cylinder device 50.

At a predetermined position of the upper surface mold 35, the upper surface mold 3 is placed.
5, a plurality of molten resin jetting ports 35b are formed which are connected to the communication passage 35a penetrating the passage 5, and the communication passage 35a is connected to the hot runner block 38. The hot runner block 38 has a passage 38a for molten resin formed therein and is constantly heated by a heating device (not shown) so that the molten resin in the passage 38a is not cured. A sliding hole 35c for the ejector pin 39 is formed in the upper surface mold 35. This ejector pin 39 has a sliding hole 35.
By extending from c, the molded article after molding is released.

An ejector plate 39a is arranged between the upper surface mold 35 and the lower surface mold 34, and the upper surface mold 3
A coil spring 39c is arranged between the lower surface of 5 and the ejector plate 39a. The ejector pin 39 of this example moves integrally with the ejector plate 39a.
Is driven by a hydraulic device 62 to slide up and down, and is automatically returned by the coil spring 39c.

A protrusion 35d is formed at a predetermined position on the outer periphery of the core die formed on the upper die 35 of this embodiment so as to abut the abutment portion 31a formed on the lower surface of the first die 31. . The main body portion of the molten resin supply device 40 of this example is a known / known injection molding machine, and although not shown, a screw rotatably and slidably inserted into the cylinder, and a screw that rotates and slides the screw. It is provided with a rotation / sliding drive device that is dynamically driven.

When the screw is rotated and slid by the rotation / sliding drive device by this injection molding machine, the cylinder is filled with the thermoplastic resin from the inlet formed on the side of the cylinder, and The molten state is maintained by the heating device attached to the cylinder, and then it is ejected from the nozzle 41 at the tip of the cylinder.

The nozzle 41 for injecting the resin
Has upper and lower two nozzle openings 42 and 43 on the tip side, and is arranged slidably toward the molding die 30. The nozzle openings 42, 43 are formed by the second mold 32 and the hot runner blocks 36, 3 formed on the second mold 32.
8 passages 36a, 38a. In addition, the nozzle 41
Is the hot runner block 36 of the second type 32.
And the hot liner block 38 of the lower die 34 of the third die
The heights of the inlets of the passages 36a and 38a and the nozzle openings 41 and 42 are set to coincide with each other.

In the stamping molding apparatus S of this embodiment, a stamping molding is performed by driving a rotation / sliding driving device of an injection molding machine, a hydraulic portion for resin injection, a driving device, etc. by a command signal from a control device (not shown). Carry out the process. In this example, when the press surface plate 10 and the third die 33 descend toward the base 20, the descending speed of the third die 33 is
It is set to 1/2 of the descending speed of the press platen 10.

Next, the stamping molding process of the stamping molding apparatus S having the above structure will be described with reference to FIGS. In this example, a case where the skin H and the resin are integrally stamped and molded will be described. Note that the skin H is omitted from FIG. 7 onward.

First, as shown in FIG. 2, the skin H is preliminarily provided between the first die 31 and the third die 33, and the third die 33 and the second die 32.
To be installed between and. And by a control device not shown,
When the press surface plate 10 is lowered to the base 20 side, the first die 31 is also lowered together therewith. At this time, the third die 33 descends at a speed half that of the first die 31 by the hydraulic cylinder (see FIG. 3).

That is, when the descending speed of the first die 31 is V,
The descending speed of the third mold 33 is V / 2. Then, when the third die 33 descends to the position of the nozzle port 42 located above, the lowering of the first die 31 and the third die 33 is stopped.
When a drive signal is output from the control device to the rotation / sliding drive device of the injection molding machine, the screw in the cylinder moves toward the nozzle 41 while rotating (see FIG. 4).

Then, when the injection molding machine is moved forward and the molten resin is injected from the nozzle openings 42 and 43 of the nozzle 41,
The molten resin is filled in the communication passages 32a and 35a through the passages 36a and 38a of the hot runner blocks 36 and 38 in the mold. Then, the resin is injected from the ejection ports 32b and 35b (gates) formed in the second mold 32 and the third mold 33, respectively, and inside the cavity formed by the first mold 31 and the third mold 33, and the third mold. Resin is supplied into the cavities formed by 33 and the second mold 32 (see FIG. 5).

Then, as shown in FIG. 6, after the injection is completed, the injector is retracted. At this time, a shut-off valve is attached to the portion of the nozzle openings 42 and 43 (nozzle touch portion) to eliminate the so-called rape phenomenon.

Next, as shown in FIG. 7, after the injection machine has retracted, the press upper plate (first mold 31) is further lowered to compression-mold the resin into the product shape. When it descends, the third
The die 33 is a first cylinder of the first die 31 by the hydraulic cylinder device 50.
It descends at a speed of / 2. In this example, since the same molded product is obtained, the pressing speed of each product is the same. Therefore, it is possible to appropriately change when stamping different products.

Next, as shown in FIG. 8, after the product resin / cooling time is completed, the first die 31 is raised. Then the third
The die 33 is a first cylinder of the first die 31 by the hydraulic cylinder device 50.
Increase at a speed of / 2.

Then, as shown in FIG. 9, the lower product formed by the second mold 32 and the third mold 33 is lifted by the ejector pin 37 and released from the mold, and the first mold 31 and the third mold 33 are removed. The upper product molded by and is released from the mold by operating the ejector pin 39 by the hydraulic cylinder device 62 incorporated in the third mold 33.

Although the hydraulic cylinder device is used as the drive device in the above embodiment, a mechanism such as an air cylinder device that can be controlled at a constant pressure can be used. Although an injection molding machine is used as a device for supplying the molten resin, an extrusion device may be used as long as the device can supply the molten resin.

[0038]

As described above, according to the molding die of the present invention,
Even with the conventional stamping press machine, two molded products are simultaneously molded in one stamping operation. As a result, the molding cycle can be shortened, the installation area of the molding apparatus can be reduced, and the capital investment can be reduced. Since two products can be obtained, it is possible to shorten the cycle, reduce the installation area, and reduce the capital investment.

[Brief description of drawings]

FIG. 1 is a perspective view showing the configuration of an apparatus according to the present invention.

FIG. 2 is a process explanatory diagram.

FIG. 3 is a process explanatory diagram.

FIG. 4 is a process explanatory diagram.

FIG. 5 is a process explanatory diagram.

FIG. 6 is a process explanatory diagram.

FIG. 7 is a process explanatory diagram.

FIG. 8 is a process explanatory diagram.

FIG. 9 is a process explanatory diagram.

[Explanation of symbols]

 S Stamping molding device 10 Press surface plate 20 Base 21 Support column 22 Support plate 22a Through hole 30 Forming die 31 First type 32 Second type 32a Communication passage 32b Jet outlet 32c Sliding hole 33 Third type 34 Lower surface type 35 Upper surface Mold 35a Communication passage 35b Jet port 35c Sliding hole 36 Hot runner block 36a Passage 37 Ejector pin 37a Ejector plate 37c Coil spring 38 Hot runner block 38a Passage 39 Ejector pin 39a Ejector plate 39c Coil spring 40 Supply device 42, 43 Nozzle port 50 Drive device (hydraulic cylinder device) 51 Rod 61 Hydraulic cylinder device 62 Hydraulic device

Claims (3)

[Claims] 1. A molding die disposed between a press surface plate and a base in a stamping molding apparatus, wherein a first die attached to the press surface plate and a second die attached to the base. A mold, and a third mold disposed between the first mold and the second mold, the first mold and the third mold forming a first cavity, and the second mold and the third mold. A stamping mold comprising a second cavity. 2. Stamping molding provided with a press platen, a base, a mold arranged between the press platen and the base, and a supply device for supplying molten resin to the mold. In the apparatus, the molding die includes a first die attached to the press surface plate, a second die disposed on the base, and a first die disposed between the first die and the second die. A third cavity, and a first cavity formed by the first die and the third die and a second cavity formed by the second die and the third die by abutting the press surface plate and the base. After the molten resin is injected into the first cavity and the second cavity from the supply device, the press platen and the base are further crimped and clamped. apparatus. 3. When the press surface plate and the third mold are descended toward the base side, the descending speed of the third mold is 1/2 of the descending speed of the press surface plate. The stamping molding device according to claim 2.