JP3922791B2 - Clamping method for injection mold - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an injection mold.
[0002]
[Prior art]
FIG. 3 shows a general three-plate type injection mold.
Reference numeral 6 denotes a fixed side mounting plate, 7 denotes a runner wiping plate, 8 denotes a fixed side template, 9 denotes a movable side, 10 denotes a guide pin, and 11 denotes a guide bush.
[0003]
In the three-plate mold configured as described above, the guide pin 10 enters the guide bush 11 in the mold clamping process, and is guided by the two parts 10 and 11, and the fixed side mold plate 8 and the movable side 9 are closed.
[0004]
[Problems to be solved by the invention]
However, in the structure described above, are provided smoothly clearance between the guide pin 10 and the guide bush 11 as shown in FIG. 4 in order to cause clamping type (D-d), and an amount corresponding movable side mold plate of this clearance fixed die plate has a problem point rather tilted.
[0005]
Further, in order to reduce this angle, there is a problem that if the clearance between the guide pin and the guide bush is reduced, the mold cannot be clamped smoothly, and if the mold is forcibly clamped, the guide pin and the guide bush are seized.
[0006]
The present invention is not possible to reduce the clearance of the guide pin and guide bush, and to provide the inclination of the mold plate injection mold die clamping method that can be prevent.
[0007]
[Means for Solving the Problems]
The technical means of the present invention is to restrain the fixed-side mold plate from tilting by restraining the fixed-side mounting plate and the fixed-side mold plate with an arm during the mold clamping process.
[0009]
DETAILED DESCRIPTION OF THE INVENTION
A mold clamping method for an injection mold according to the present invention is a mold clamping method for an injection mold in which a movable side mold plate comes close to a fixed side mold plate during injection molding, and the mold is clamped. Until the middle stage of the tightening process, the tip of the arm whose base end is rotatably supported by the mold facing the movable mold and urged by the urging means is brought into contact with the fixed mold. The surface parallel to the mold clamping direction of the fixed side mold plate is restrained, and in the middle of the mold clamping process, the arm of the arm is attached to the inclined portion formed at the tip of the release bar attached to the movable side mold plate. The protrusion provided at the tip rides up to push up the arm against the urging to release the restraint of the plane parallel to the clamping direction of the fixed side template by the arm, and then the fixing Restrain the surface parallel to the clamping direction of the side mold plate with the release bar. And wherein the Mesuru.
[0010]
According to this configuration, when the mold is fully opened, the projection of the arm enters the runner part side of the fixed-side mold plate by the action of the biasing means, and the mold is clamped as it is. Even if it tries to tilt, it cannot tilt because the arm is stuck and restrained behind. The mold is clamped as it is, and the release bar lifts the arm just before the product part closes and removes the arm from the fixed side mold plate, so that the remaining runner part can be closed and the mold clamping is completed.
[0011]
Hereinafter, embodiments of the present invention will be described with reference to FIGS. 1 and 2.
(Embodiment 1)
2A and 2B show the mold fully opened state, and FIGS. 1A and 1B show the state immediately before the product part is closed in the middle of the mold clamping process.
[0012]
In FIG. 2, the base end portion of the arm 1 is rotatably supported on the mold by the shaft 2, and the distal end portion of the arm 1 is pressed against the fixed-side mold plate 4 by a spring 3 as an urging means. The protrusion 1a on the inner side of the fixed plate 4 is in contact with a surface parallel to the clamping direction of the fixed-side template 4. A pin 1b protruding in the lateral direction is provided at the tip of the arm 1.
[0013]
A release bar 5 is attached to the movable side 9 of the mold corresponding to the arm 1. An inclined portion 5 a is formed at the tip of the release bar 5.
Although only one pair of arm 1 and release bar 5 is shown in FIGS. 1 and 2, in reality, multiple pairs of arm 1 and release bar 5 are attached to two or more locations of the mold. It has been.
[0014]
Since the mold clamping process is started in the state shown in FIGS. 2A and 2B, the fixed side mold plate 4 is restrained by the arm 1 and the product part is closed as follows without being inclined. In the middle of the mold clamping process, as shown in FIGS. 1 (a) and 1 (b), the pin 1 b at the tip of each arm 1 rides on the inclined portion 5 a of the release bar 5 and each arm 1 is attached with a spring 3. As a result, the contact between the projection 1a of the arm 1 and the surface parallel to the clamping direction of the fixed-side template 4 is released, and the constraint on the fixed-side template 4 is released. The runner part can be closed following the product part to complete the mold clamping.
[0015]
In the above-described embodiment, the spring is used as the urging means, but it may be configured using other elastic bodies such as rubber.
[0016]
【The invention's effect】
As described above, according to the present invention, a mold clamping method for an injection mold in which a movable side mold plate is brought close to a fixed side mold plate during injection molding, and the mold is clamped. Up to the middle stage, the base end portion is rotatably supported by a mold facing the movable mold, and the distal end of the arm urged by the urging means is brought into contact with the fixed mold plate and fixed. A surface parallel to the mold clamping direction of the side mold plate is constrained, and in the middle of the mold clamping process, provided on the tip of the arm at an inclined portion formed at the tip of a release bar attached to the movable side mold plate. The raised protrusion rides up to push up the arm against the bias to release the restraint of the plane parallel to the clamping direction of the fixed-side template by the arm, and then the fixed-side template Clamp the surface parallel to the mold clamping direction with the release bar. In, without having to reduce the clearance of the guide pin and guide bush, it is possible to prevent the inclination of the mold plate, so that the flexibility of the product design is increased.
[Brief description of the drawings]
FIG. 1 is a side view and a plan view immediately before a product part is closed in the middle of a mold clamping process of an injection mold clamping device of the present invention. FIG. 2 is a schematic view of an injection mold clamping device of the present invention. Side view and plan view of the mold fully open [Fig. 3] Diagram showing a general three-plate type injection mold structure [Fig. 4] Enlarged view of the main part of Fig. 3 [Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Arm 1a Protrusion 1b Pin 2 Axis 3 Spring 4 Fixed side template 5 Release bar 5a Inclined part 6 Fixed side mounting plate 7 Runner feeder plate 8 Fixed side template 9 Movable side 10 Guide pin 11 Guide bush

Claims (1)

A mold clamping method for an injection mold in which a movable side mold plate (9) comes close to a fixed side mold plate (4) during injection molding to clamp the mold,
Until the middle of the mold clamping process, the arm (1) whose base end is rotatably supported by the mold (2) facing the movable mold (9) and is urged by the urging means (3 ). tip, restraining the clamping direction parallel to the surface of the fixed die plate is brought into contact with the fixed die plate (4) (4) of,
In the middle of the mold clamping process, a protrusion provided at the tip of the arm (1) on the inclined portion (5a) formed at the tip of the release bar (5) attached to the movable side mold (9). (1b) rides up, the arm (1) is pushed up against the urging force, and the restraint of the plane parallel to the clamping direction of the fixed side template (4) by the arm (1) is released. Then, a mold clamping method for injection molds in which a surface parallel to the mold clamping direction of the fixed side mold plate (4 ) is constrained by the release bar (5) and clamped.

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