JPH0729302B2 - Demolding device for rubber elastic body for torsion damper - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a device for removing a strip-shaped rubber elastic body for a torsional damper from a molding die.

(Background Art) As a method for manufacturing a torsional damper in which a thin rubber layer is interposed between a rigid inner tubular member and a rigid outer tubular member serving as a damper mass, the inner tubular member and the outer tubular member are prescribed. Set in the mold with the gap between them, and inject a rubber material into these gaps to vulcanize and bond them together.
There is a method in which a rubber material is once independently vulcanized and molded into a strip plate shape or a circular shape, and this is press-fitted and fixed between an inner cylinder member and an outer cylinder member.

By the way, as a molding die for molding the above-mentioned strip-shaped rubber elastic body, a molding die 102 having a strip-shaped molding cavity 100 extending straight as shown in FIG. 11 is usually used.

In this case, when the size (plane size) of the molding die 102 is small, the molding cavity 100 has to be extended in the diagonal direction of the molding die 102 as shown in FIG.
However, this reduces the number of molded products to be taken. Therefore, as shown in FIGS. 12 and 13, it is considered that the molding die 102 is divided into a plurality of upper and lower stages to form the molding cavity 100 in a plurality of stages.
If this is done, the mold assembly of each split mold and the separation of the molds will be complicated, and the work of taking out the molded product will be complicated.

Further, in this molding die 102, a rubber molded product is molded into the molding die 102.
At the time of taking out from the mold, the end portion is first peeled off so that the end portion is grasped and the end portion is separated from the molding die, but this work has to be done manually by an operator.

As described above, when the main molding die 102 is used, the molding and demolding work is complicated and it is difficult to mechanize and automate, which hinders the improvement of the production efficiency of the rubber elastic body.

Therefore, the inventors of the present invention configured a molding die so as to include a middle die having a circular outer peripheral surface and an outer die separate from this, and along the outer peripheral surface of the circular middle die, a strip-shaped It has been devised to mold the rubber elastic body into a circular shape (or a substantially circular shape).

(Problems to be Solved by the Invention) In the present invention, a strip-shaped rubber elastic body formed along a circular outer peripheral surface of a medium die is mechanically released from the die. Was made as a problem to be solved. Thus, the gist of the apparatus according to the present invention is that a molding die including a middle die having a circular outer peripheral surface and an outer die separate from the middle die is molded along the outer peripheral circular surface of the middle die. A device for removing a strip-shaped rubber elastic body for a tional damper from the molding die, and (a) supporting means for rotatably supporting both ends of the middle die in a state where the middle die is separated from the outer die;
(B) chuck means for grasping a flash portion formed at the longitudinal end of the molded strip-shaped rubber elastic body, and (c) holding the chuck means, and the chuck means grasps the flash portion. A rotating arm for peeling the rubber elastic body molded from the middle mold while rotating the middle mold by rotating the chuck means in the state; and (d) a driving means for driving the rotation arm. Especially.

(Operation and Effect of the Invention) In the device of the present invention, the chuck means grips the flash portion generated at the end of the molded product while the both ends of the middle die are rotatably supported by the support means, and the chuck is rotated. It is rotated by the moving arm. Then, while the middle mold rotates, the molded products are sequentially separated from the middle mold from the end portion thereof.

As described above, according to the present invention, it is possible to mechanically and automatically release the strip-shaped rubber elastic body. As a result, the demolding work of the rubber elastic body can be made unmanned and labor-saving, thereby improving the production efficiency.

(Example) Next, the Example of this invention is described in detail based on drawing.

In FIG. 2, reference numeral 10 is a metal mold for molding a strip-shaped rubber elastic body in a torsional damper, which is a cylindrical middle mold.
It includes an upper mold 14 and a lower mold 16 as outer molds.
As shown in FIG. 3, the middle die 12 has an upper end surface which is a horizontal flat surface 18, and the flat surface 18 coincides with the flat surface of the upper die 14. In the middle die 12, a plurality of strip-shaped molding cavities 20 (here, 6 in total, 12 in total) are formed along the circular outer peripheral surface, as shown in FIG. Are provided in parallel and densely with each other.

An injection hole 22 is formed in the center of the plane of the outer mold, and a main passage 24 is formed following the injection hole 22. In addition, a branch passage 2 that branches from the main passage 24 for the medium-sized 12
6, 28 (FIG. 3) are provided, and the branch passages 28 communicate with one end of each molding cavity 20.

Shaft portions 30 are provided at both ends of the middle die 12. As shown in FIG. 5, the axes of the shafts 30 are eccentric by a certain distance above the center of the middle die 12.

At the end of the medium mold 12, there is also a horizontally long rectangular positioning bar 32.
Are fixed by bolts 34 as shown in FIG. The positioning bar 32 has upper and lower surfaces which are parallel and horizontal to each other, and correspondingly the upper mold 14
And the lower mold 16 have downward and upward horizontal positioning surfaces, respectively.
38, 39 (see FIGS. 7 and 8) are formed and the positioning bar 3
2 is sandwiched between these positioning surfaces 38, 39 from above and below and positioned horizontally.

In addition, U-shaped notches are provided at both ends in the longitudinal direction of the positioning bar 32.
35 is provided and a guide pin that stands up from the lower mold 16
36 comes in.

FIGS. 1, 9, and 10 show an apparatus of this example for releasing the molded strip-shaped rubber elastic body from the molding die 10. As shown in detail in FIG. 1, this apparatus is provided with a supporting device having a receiving member 40 and a projecting cylinder 42, and as shown in FIG. 9, the upper mold 14 is separated. When the lower die 16 and the middle die 12 are conveyed to a predetermined position by a predetermined conveying means, the protruding cylinder
42 is actuated, the receiving member 40 lifts the shaft portions 30 at both ends of the middle die 12 by a predetermined amount, and a rotatably supporting arm is provided above the supporting device.
The rotating arm 44 can be rotated integrally with the shaft 46.

Below the arm 44, an elevating plate 48 is arranged,
The elevating plate 48 can be moved up and down by a cylinder 50 fixed downward on the rotating arm 44.

The lifting plate 48 is provided with a plurality (here, three) of chuck units 52. These chuck units
52 has a claw 56 and a cylinder 54 for opening and closing the claw 56.

That is, in this example, the chuck unit 52 is held by the rotating arm 44 via the elevating plate 48 and the cylinder 50.

On the other hand, from the shaft 46 that rotates integrally with the rotating arm 44, the lever
58 extends, and an arm drive cylinder 60 (FIGS. 9 and 10) is connected to the tip of the lever 58.

In the molding die 10 of this example, when the rubber material is injected from the injection hole 22 in the mold clamped state, the rubber material is filled into each molding cavity 20 through the main passage 24 and the branch passages 26 and 28. .

After the rubber material has been vulcanized and molded in the molding cavity 20, the upper mold 14 is first separated upward, and then the lower mold 16 and the middle mold.
12 is conveyed to a predetermined position by the conveying means. Then, the stand-by receiver 40 is projected upward by the projecting cylinder 42. As a result, the shaft portions 30 at both ends of the middle die 12 are supported by the receiving member 40 and lifted upward.

On the other hand, the chuck unit 52 that was standing by above
When the cylinder is lifted, it is lowered together with the lifting plate 48 by the cylinder 50. Then, when reaching the descending end, the cylinder 54 of the chuck unit 52 is actuated next to close the claw 56 in the opened state, and the rubber flash 31, 33 generated in the main passage 24 and the specially provided recess portion Hold the part. Then, the arm drive cylinder 60 is activated and the
As shown in FIG. 10, the rotating arm 44 is rotated counterclockwise in the figure. Then, the middle mold 12 is rotated while being supported by the receiving member 40, and simultaneously with this, the molded products (rubber plate-shaped rubber elastic bodies) are peeled off from the middle mold 12 sequentially from the ends. That is, each molded product is released from the middle mold 12.

When each molded product is completely peeled off from the middle mold 12, the free middle mold 12 is rotated by its own weight thereafter based on the fact that the shaft portions 30 at both ends are arranged in the eccentric position, and the original angular position is restored. Return to. At this time, even if the middle die 12 does not completely return to the original angular position, the middle die 12 is surely returned to the original angular position by the following operation. That is, when the middle die 12 supported by the receiving tool 40 is transferred onto the lower die 16 by the descending motion of the projecting cylinder 42, and then the upper die 14 is lowered onto the lower die 16, at that time, The positioning bar 32 is sandwiched by the positioning surfaces 38, 39 of the upper mold 14 and the lower mold 16 from above and below to horizontally correct the posture. As a result, the middle die 12 is accurately positioned at the initial angular position.

Although the embodiment of the present invention has been described in detail above, this is merely an embodiment, and the present invention can be configured in a form in which various modifications are made based on the knowledge of a person skilled in the art without departing from the gist thereof. is there.

[Brief description of drawings]

FIG. 1 is a perspective view of a demolding apparatus according to an embodiment of the present invention,
2 is a perspective view of a molding die, FIG. 3 is a perspective view of a middle die of the molding die, and FIG. 4 is a cross-sectional view of a main part of a molding cavity provided in the middle die. 5 and 6 are a side sectional view and a plan sectional view of an essential part of a middle mold of the same molding die, respectively.
FIG. 8 and FIG. 8 are explanatory views of the action of the positioning bar in the same mold. 9 and 10 are explanatory views of the operation of the demolding device shown in FIG. 1, respectively, and are FIGS. 11, 12 and 13 respectively.
The drawings are a plan view, a cross-sectional view, and a cutaway perspective view of a main part of a mold shown for explaining the background of the present invention. 10: Mold for molding, 12: Medium mold 14: Upper mold, 16: Lower mold 20: Molding cavity 31,33: Rubber beam 40: Receptacle, 42: Projecting cylinder 44: Rotating arm, 52: Chuck unit 54: Cylinder, 56: Claw 60: Arm drive cylinder

Claims (1)

[Claims] 1. A strip plate shape for a torsion damper, which is formed along the circular outer peripheral surface of the middle mold, of a molding die including a middle mold having a circular outer peripheral surface and an outer mold separate from the middle mold. A device for removing the rubber elastic body from the mold, (a) a support means for rotatably supporting both ends of the middle mold in a state where the middle mold is separated from the outer mold; and (b) a molded strip. Chuck means for grasping a flash portion formed at the longitudinal end of the plate-like rubber elastic body; and (c) holding the chuck means and rotating the chuck means with the chuck means grasping the flash portion. A rotating arm for peeling the molded rubber elastic body from the middle mold by rotating the middle mold by moving the middle mold; and (d) drive means for driving the rotating arm. Demolding device for rubber elastic body for tional damper.