JPH06114856A - Production of buffer element for damping rubber - Google Patents

Abstract

PURPOSE:To reduce the production cost and enhance the durability of a buffer element by preventing the protruding part formed to a product from protruding from the upper surface of the product to obviate the cutting processing of the protruding part. CONSTITUTION:A molded buffer element 10 partially has a cavity 11 and an elastic material is injected in a cavity 9 from the supply passage 5 provided to a mold 1 so as to be opposed to the molding place of the cavity 11. The part on the side of the supply passage 5 of the cured buffer element 10, that is, the protruding part 12 of the buffer element 10 is cut so as not to outwardly protrude from the surface adjacent to the cavity 11 at the time of the opening of the mold 1.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for manufacturing a shock-absorbing rubber cushioning body such as a torsion damper and a bumper bound.

[0002]

2. Description of the Related Art A conventional method for manufacturing a shock absorbing rubber cushioning body is as follows.
As shown in FIG. 7, an elastic material was injected into the cavity 101 of the mold 100 for molding. In the molding die 100, the second fixed die 103 is assembled to the first fixed die 102, and the movable die 1
04 and these are closed, and the supply path 10 of the movable mold 104 is closed.
5, the elastic material is injected into the cavity 101, and then the elastic material is heated and cured, and then the fixed molds 102, 103
And the movable mold 104 are released from the mold. The supply passage 105 is formed with a narrow opening 106 having a small cross-sectional area and an opening 107 having a large cross-sectional area extending from the narrow opening 106 to the cavity 101. Is disconnected.

[0003]

When manufactured by the conventional method shown in FIG. 7, a convex portion 109 remains on the upper surface of the product (buffer) 108 as shown in FIGS. 8 to 10. When such a convex portion 109 protrudes from the upper surface, it comes into contact with a counterpart component during use, a large strain is always generated in this portion, the initial spring characteristics change, and the quality of the cushioning body 108 deteriorates. Further, if stress is concentrated on the convex portion 109, there is a possibility that breakage may proceed at this portion. Such a convex portion 10
If 9 is cut with scissors or the like, an extra finishing process is required, which leads to an increase in cost.

Therefore, according to the present invention, the convex portion is prevented from projecting on the upper surface of the product, and the process for cutting the convex portion is not necessary, so that the manufacturing cost is reduced and the durability of the buffer is improved. The purpose is to provide.

[0005]

In order to achieve the above object, the present invention provides a cushioning body for vibration damping rubber, which is molded in a method of manufacturing an elastic material by injecting an elastic material into a cavity of a molding die. Has a dent partially, and an elastic material is injected into the cavity from a supply path provided in the mold so as to face the dent molding point. When the mold was opened, it was cut and left so that it did not protrude outside the surface adjacent to the depression.

[0006]

Since the top surface of the convex portion formed on the molded cushioning body is accommodated in the depression and does not project outward than the surface adjacent to the depression, the cushioning body due to contact between the mating component and the convex portion Does not deteriorate. Further, there is no need for a process of cutting the convex portion.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT A preferred embodiment of the present invention will be described below with reference to the drawings.

In the embodiment shown in FIG. 1, the molding die 1 is composed of a first fixed die 2, a second fixed die 3 and a movable die 4, and a supply passage 5 is formed in the movable die 4. The supply passage 5 is provided with a throttle opening 6 and a release opening 7 as in the conventional case. Further, the plunger 8 presses the movable die 4 after closing the fixed dies 2 and 3 and the movable die 4. A cavity 9 is formed in the molding die 1, and an elastic material is injected from the supply path 5 to mold the buffer body 10 in the cavity 9. The buffer body 10 to be molded has a recess 11 partially (see FIG. 2), and the supply path 5 is provided so as to face the recess 11. After the mold is closed, an elastic material is injected into the cavity 9 through the supply passage 5, and then the elastic material is heated and cured, and then the fixed molds 2 and 3 and the movable mold 4 are separated from each other. The buffer 10 thus cut is cut. At this time, the convex portion 12 is formed in the depression 11 as shown in FIG. The top surface of the convex portion 12 is a depression 1
It is cut at the time of mold release so as not to project outward from the surface adjacent to 1.

In FIG. 1, reference numeral 13 indicates a metal fitting inserted in the molding die 1, and the metal fitting 13 is attached to the shock absorber 10.
Are vulcanized and bonded.

The state shown in FIG. 3 shows the case where the anti-vibration rubber is used,
The mating component 14 contacts the surface of the buffer 10 adjacent to the depression 11, and the top surface of the convex portion 12 does not contact the mating component 14.

In another embodiment shown in FIG. 4, the shape of the cushioning body 10 to be molded is changed, and in this embodiment as well, the portion of the cured cushioning body 10 on the side of the supply path 5, that is, the convex portion 1 is formed.
2 is cut and left so as not to project outward from the surface adjacent to the recess 11 when the mold 1 is opened.

FIG. 5 shows a molded shock absorbing rubber cushioning body 10, in which a convex portion 12 is formed in a recess 11.

FIG. 6 is a plan view of the molded antivibration rubber cushioning body 10 in which a substantially rectangular recess 11 is provided.

[0014]

As described above, according to the present invention, the cushioning body to be molded has a partial recess, and the elastic material is supplied from the supply path provided in the mold so as to face the recess forming point. Is injected into the cavity, and the portion on the supply path side of the hardened buffer body, that is, the convex portion, is cut and remains so as not to project outward than the surface adjacent to the recess when the mold is opened. Does not come into contact with the mating component, and a large strain is always generated in the convex portion, the initial spring characteristics change, and the durability is not deteriorated. Moreover, since the process of cutting the convex portion is not necessary, the manufacturing cost can be reduced.

[Brief description of drawings]

FIG. 1 is a sectional view showing an embodiment of the present invention.

FIG. 2 is a cross-sectional view of a recessed portion of a buffer body molded by the molding die of FIG.

FIG. 3 is a cross-sectional view showing a molded anti-vibration rubber cushioning body when in use.

FIG. 4 is a sectional view showing another embodiment.

FIG. 5 is a cross-sectional view of the vibration-proof rubber cushioning body formed in FIG.

FIG. 6 is a plan view of the shock-absorbing rubber cushioning body formed in FIG.

FIG. 7 is a sectional view showing a conventional example.

FIG. 8 is a sectional view showing an example of the shape of a convex portion in a conventional example.

FIG. 9 is a cross-sectional view showing another example of the convex portion in the conventional example.

FIG. 10 is a cross-sectional view showing still another example of the convex portion in the conventional example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Mold 5 Supply path 9 Cavity 10 Buffer 11 Dimple 12 Convex part

Continuation of the front page (51) Int.Cl. ⁵ Identification number Office reference number FI technical display location B29C 45/14 7344-4F // B29K 21:00 105: 24

Claims (1)

[Claims] 1. A method for manufacturing an anti-vibration rubber cushioning body by injecting an elastic material into a cavity of a molding die, wherein the cushioning body to be molded has a dent partially so as to face the dent molding point. The elastic material is injected into the cavity from the supply path provided in the mold, and the part of the cured buffer body on the supply path side, that is, the convex portion, does not project outward than the surface adjacent to the recess when the mold is opened. A method for producing a shock-absorbing rubber shock absorber, which is characterized in that it is cut and left.