JPS61239926A - Mold for injection molding - Google Patents

Abstract

PURPOSE:To enhance completion of cycle, by a mold engaging and disengaging mechanism having the engaging body provided to one of a pair of molds and the engaging shaft provided to the other mold in a state freely engaging and disengaging with the engaging body. CONSTITUTION:An engaging body 5 is provided so that the side of the engaging recessed part 7 is formed to the side opposite to a clamping and loosening drive part 6 which consists of the L-shape support jig 8 mounted to a mold 2 and the hydraulic cylinder 9 supported by said support jig 8. The hydraulic cylinder 9 consists of the main body 10 directly fixed to the support jig 8 and the engaging shaft 13 provided in a protruded state in opposed relation to the engaging body 5 so as to freely advance and retract with respect to the main body 10 in the directions shown by arrows 11a, 11b and to freely revolve to the directions shown by arrows 12a, 12b. The engaging shaft 13 consists of a base shaft part 14 and the C-shape engaging element 15 connected to the leading end of said base shaft part 14 while the engaging element 15 is engaged with the engaging body 5 and the engaging recessed part 16 is provided so as to be formed in the side of the base shaft part 14.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to an injection molding metal suitable for, for example, foam molding.

[Technical background of the invention and its problems]

Foam molding method (Expandable MoldiB;
x Kusbandapuru Molding) is a general term for molding porous plastic products. and.

Molding methods include injection molding, mold molding, and extrusion molding.

There are blow molding methods, etc. Among these, the "foam injection molding" method is the most commonly used. In particular, the 2:O foam injection molding method (I) allows the molding of thick-walled products.
(II) A structure consisting of a high-density epidermal region and a low-density central region can be obtained. Therefore, it has low internal strain and excellent heat insulation, sound absorption, and cushioning properties. (I
l+) The appearance of the surface of the molded product has a grain pattern or marble pattern that resembles wood.

It has excellent characteristics such as Therefore, light electrical equipment,
It is used for hacking and large structural parts such as office machines.

By the way, this foam injection molding method involves layering a molding material to which a foaming agent has been added by applying pressure in a cylinder to prevent foaming, and then injecting this molten molding material into a mold under normal pressure. do. The injected material fills the cavity due to the expansion force of the self-cutting blade (this is called a "filling"), and a molded product is obtained. However, in the single-foam injection molding method, the material injected into the cavity is

Because of its foamed structure, heat conduction is poor, and cooling time is required to be longer than with regular injection molding. If the cooling time is too short, after the molded product is removed from the mold, the internal expansion force will cause cracks on the surface of the molded product. So, recently, after injection molding.

After removing the cavity molding mold from the support mechanism, another waiting mold is supported by the support mechanism while secondary cooling is performed at another location.

The molding cycle is shortened by continuing the molding operation. However, in this case, when the clamping pressure by the support mechanism is released, a problem arises in that the pair of molds separates due to the internal foaming pressure.

[Purpose of the invention] The present invention has been made in consideration of the above circumstances.

Injection molding that can improve cycle-up 1
The purpose is to provide metal plates for shapes.

[Summary of the invention]

A mold having a pair of molds, a locking body provided on one of the pair of molds, and a locking shaft provided on the other of the pair of molds so as to be able to be freely engaged with and detached from the locking body. It consists of a detachable mechanism.

[Embodiments of the invention]

An embodiment of the present invention will be described below in detail with reference to the drawings.

1 to 747 show the injection mold of this embodiment. This mold consists of a fixed side mold (1) that is removably attached to an injection plate fixedly provided on a toggle type mold clamping device, for example, and a fixed side mold (1) that faces the fixed side mold (1) so that it can move forward and backward. a movable mold (2) which is removably attached to the mold clamping plate of the mold clamping device and forms a cavity into which foamable molten resin is injected together with the fixed mold (1); It is comprised of a fixed mold (1) and a movable mold (2) K, and a mold attachment/detachment mechanism (3) for tightening and loosening the molds (1) and (2). Then, the mold attachment/detachment mechanism (3) is configured to handle the parting m of the mold (1).
(4) U-shaped O locking body fixed at a position close to K (
5) and a tightening/loosening drive unit (5) installed at a position close to the parting surface (4)K of the mold (2) facing the locking body (5).
6) It consists of. The locking body (5) is provided so that the engagement recess (7) side is opposite to the tightening/loosening drive unit (6) K. On the other hand, the tightening/slowing drive section (6) is
It consists of an L-shaped support (8) attached to the mold (2), and a hydraulic cylinder (9) supported by the support (8). And this hydraulic cylinder (9) is
The main body (a) is directly fixed to the support (8), and this main body (
11 and a locking shaft 0 protruding from the locking body (5) so as to be movable in the directions of arrows (lla) and (llb) and rotatable in the directions of arrows (12a) and (12b). ing. This locking shaft (t3 is a cylindrical base shaft part α) and a U-shaped engager (14) connected to the tip of this base shaft part (14).
! It consists of 19. This engaging element (US) engages with the locking body (5), and is provided so that its engaging recess (IQ) is on the base shaft part I side.
However, in the injection mold having the above-mentioned configuration.

First, start the mold clamping device and move the mold (2) with the arrow (lla).
direction and bring it into close contact with the mold (1). , then,
After connecting the pressure oil pipe to the hydraulic cylinder (9), lock the locking shaft 0.
Move forward in the direction of the arrow (11) (see Figure 2).

Then, the locking shaft is rotated 90 degrees in the direction of arrow (12a) (see FIG. 3). Next, move the locking shaft (13) backward in the direction of the arrow (llb), and move the engager (I5) to the locking body (5).
) and fasten the molds (1) and (2) together (see Figure 4). Then, remove the pressure oil pipe from the hydraulic cylinder (9). With the molds (1) and (2) thus integrally tightened, a foamable molten resin such as polystyrene, polypropylene, polyethylene, etc. is press-fitted into the cavity through the nozzle. Then, the injected foamable molten resin fills the cavity due to gas expansion.

After completing the press-fitting of the foamable molten resin, the mold (1),
(2) is removed from the mold clamping device.

Transport to another location example. Thereafter, another injection mold, which has not yet been injected with molten resin, is mounted on the mold clamping device. On the other hand, the molds (1) and (2) that were transferred to another location were left to cool until the molten resin injected into the cavity completely solidified, and the molds that were left to cool were transferred to another mold. After the injection is completed, the mold is attached to the mold clamping device again. In parallel with this operation, the injection mold mounted on the mold clamping device is additionally injected with foamable molten resin as before, and then moved to another location for cooling. Next, the cooled molds (1) and (2) are mounted on the clamping device again, and when the molten resin is completely solidified, the E oil pipe is connected to the hydraulic cylinder (9), and the locking shaft (13 is aligned with the arrow (
1151) to release the fastening of the molds (1) and (2) (see Fig. 5). Then, attach the locking shaft (13 to 9
0 degrees.

Rotate in the direction of arrow (12b) (see Figure 6). Further, the locking shaft 0 is moved back in the direction of the arrow (llb). Thus, the mold (2) is moved in the direction of the arrow (llb) relative to the mold (1), thus the injection mold of this embodiment.

The pair of molds (1) and (2) are automatically tightened and loosened in order to cool the molten resin filled in a 1-kilometre mold and transport it to another location safely and securely. The molding cycle can be greatly shortened by using multiple molds of the same type.

In addition, in the above embodiment, the mold attachment/detachment mechanism (3) is
Although the number is one, the number may be increased as necessary.

Further, a pneumatic cylinder may be used in place of the hydraulic cylinder (9). Also, place the locking body (5) on the movable side mold (2).

The tightening/loosening drive unit (6) may be attached to the fixed side joint fJl (1).

Furthermore, the injection mold of the present invention can be applied not only to the single-foam molding method but also to ordinary injection molds.

〔Effect of the invention〕

The injection mold of the present invention can automatically tighten and loosen a pair of molds, and can safely and reliably transfer the molten resin filled into the capitivity to another location for cooling. Therefore, when multiple similar molds are used, the molding cycle can be significantly shortened without sacrificing molding quality.

[Brief explanation of the drawing]

FIG. 1 is a plan view of an injection mold according to an embodiment of the present invention;
FIGS. 2 to 7 are explanatory diagrams of the tightening and loosening operations of the mold. (1), (2): Mold, (3): Mold attachment/detachment mechanism. (5): Locking body, C3: Locking shaft. Agent Patent Attorney Noriyuki Chika (and 1 other person) Figure 1 Figure 3 Figure 6

Claims (1)

[Claims] A pair of molds forming a cavity into which molten resin is injected, a locking body provided in one of the pair of molds, and a locking body provided in the other mold where the locking body is not provided. The mold attachment/detachment mechanism includes a locking shaft that detachably engages with the locking body to integrally tighten the pair of molds when the pair of molds are brought into close contact with each other. A mold for injection molding.