JPS642493B2 - - Google Patents

Description

Detailed Description of the Invention (Field of Industrial Application) The present invention relates to rubber products having metal inserts, such as rubber bushings used in support parts of automobile engine mounts and suspension members.
This invention relates to a method for manufacturing rubber products such as strut mounts using a multi-cavity mold.

(Prior Art) Conventionally, this type of rubber product, for example, a rubber bushing, has a metal inner cylinder 1, as shown in Figures 3 and 4.
A rubber bushing 1 is formed by filling a rubber layer 1c between the outer cylinder 1b and the inner cylinder 1a and the outer cylinder 1b using a multi-cavity mold, At the same time, more than ten pieces were molded and vulcanized.

When molding and vulcanizing, the operator sets the inner cylinder 1a and outer cylinder 1b, which will serve as inserts, one by one into the numerous cavity recesses in the lower mold when the mold is opened, and then closes the mold. It was molded and vulcanized.

(Problem to be Solved by the Invention) However, it is time consuming to sequentially set the inserts one by one into a large number of cavity recesses during molding and vulcanization, and at the same time, for example, the inserts set first are Compared to inserts set in Due to the difference in the setting order, if rubber was injected and vulcanized after the mold was closed, there was a risk that the quality of the molded and vulcanized rubber products would vary.

(Means for Solving the Problems) The present invention provides a method for manufacturing a rubber product having a metal insert using a multi-cavity mold, in which a plurality of cavity recesses are accommodated when the mold is opened. When the mold is opened, a setting jig is equipped with a predetermined number of receiving sections into which metal inserts can be placed and a shutter that simultaneously opens holes in the bottoms of these receiving sections and drops the metal inserts placed in the receiving sections. A setting jig with a metal insert previously placed in the receiving part is placed above the mold cavity recess, and the shutter is opened and the metal insert is dropped and set into each cavity recess, and the mold is closed. After that, the above-mentioned problems are solved by molding and vulcanizing.

(Operations and Effects of the Invention) The method for manufacturing a rubber product having a metal insert according to the present invention is such that when a metal insert is set into a plurality of cavity recesses when opening a mold, a predetermined receiving part and a shutter are connected to each other. The metal insert is set using a set jig provided with the metal insert, which is placed above the mold cavity recess when the mold is opened, and the metal insert is placed in the receiving part in advance, and then the shutter is opened to receive the mold. The metal inserts in the mold can be set by simultaneously dropping them into the recesses for each cavity, which greatly reduces the setting time when setting metal inserts into a multi-cavity mold. Since the metal insert can be set during molding and vulcanization, this type of rubber product can be manufactured efficiently and the manufacturing time can be shortened. In addition, since metal inserts can be set into multiple mold cavity recesses at the same time, the time that multiple metal inserts remain in the cavity recesses until molding and vulcanization can be made approximately the same, and Since the temperature of the plurality of metal inserts themselves becomes constant, the quality of the rubber product to be molded and cured can be stabilized.

(Example) The rubber product manufactured in this example includes an inner cylinder 1a and an outer cylinder 1b made of metal as shown in FIGS. The rubber bushing 1 is formed by filling the rubber bushing 1c with the inner cylinder 1a and the outer cylinder 1b as inserts, and is manufactured by molding and vulcanizing using a multi-cavity mold 11.

The setting jig 2 for setting the inner cylinder 1a and the outer cylinder 1b into the mold (lower mold 13) at the time of mold opening has first, second and fifth parts.
As shown in the figure, a receiving plate 3 is provided with a predetermined number of receiving portions 4 in which an inner cylinder 1a and an outer cylinder 1b can be arranged corresponding to the arrangement of a plurality of cavity recesses 13a in a lower mold 13, and a receiving plate 3 and a shutter 5 slidably provided on the lower surface.

The receiving part 4 of the receiving plate 3 has an opening 4b at the bottom that has approximately the same size as the outer diameter of the outer cylinder 1b, and the opening 4
A recess 4a having a depth approximately the same as the length of the inner cylinder 1a is formed from b, and a cylindrical projection 4c having approximately the same dimensions as the inner diameter of the inner cylinder 1a protrudes from the center of the recess 4a toward the opening 4b. Further, a cylindrical protrusion 4d protrudes from the outer periphery of the protrusion 4c with a gap formed therein and has an outer diameter approximately the same as the inner diameter of the outer cylinder 1b (see Fig. 5). .

Further, the receiving plate 3 is provided with two handles 3a on the sides of its upper surface, and the setting jig 2 is provided at the four corners of its lower surface.
When placing the mold onto the lower mold 13,
A pin 3b is provided on the bottom surface of the shutter 5 to guide the side surface of the shutter 5 when the shutter 5 slides.
is formed.

The shutter 5 is provided with holes 5a, the number of which corresponds to the receiving portions 4 of the receiving plate 3, and whose inner diameter is approximately the same as the outer diameter of the outer cylinder 1b. When sliding, the plurality of openings 4b at the bottom of the receiving portion 4 are opened at the same time. Also, on the rear end of the upper surface of the shutter 5, when sliding,
A stopper 5 is provided so that the shutter 5 can be restricted at a position where the opening 4b at the bottom of the receiving part 4 is opened by the hole 5a.
Further, a stopper 5d is provided on the front end of the upper surface of the shutter 5 to restrict the shutter 5 at a position where the opening 4b at the bottom of the receiving portion 4 can be closed. Note that 5b is a handle used when the shutter 5 slides.

The mold 11 that sets the inner cylinder 1a and the outer cylinder 1b and molds and vulcanizes the rubber bushing 1 has seventh, eighth, and third molds.
As shown in FIGS. 9, 11, and 12, the upper mold 12 and the lower mold 13 each have a predetermined number of cavity recesses 12a and 13a that form a plurality of predetermined cavities 44 when the mold is closed. A set pin 13b having an outer diameter approximately the same as the inner diameter of the inner cylinder 1a is protruded from the center of the recess 13a.

Further, the upper mold 12 is provided with gates, runners, sprues, an injection machine, etc. (not shown) so that rubber can be injected into each cavity 14 when the mold is closed.

The upper mold 12 and lower mold 13 are held by surface plates 21 and 22 in which heaters are embedded, and when the mold is closed, the lower surface plate 22 is pushed upward by a hydraulic ram 23. There is. In addition, a pusher (not shown) is provided on the lower surface plate 22 so that when the mold 11 is opened, the lower mold 13 can be moved forward to set the inner cylinder 1a and outer cylinder 1b, which will serve as inserts. 24 is connected to the rear part of the lower die 13. 22a is the lower mold 13 when opening the mold.
This is a support portion that supports the lower die 13 when the lower die 13 is moved forward.

Next, manufacturing of this rubber bushing 1 will be explained.

First, turn over the setting jig 2, pull it toward you using the handle 5b until the shutter 5 is regulated by the stoppers 5c, align the hole 5a with the opening 4b in the receiving part 4 of the receiving plate 3, and then reception section 4
Into the recess 4a, insert the inner cylinder 1a and the outer cylinder 1b, which are coated with an adhesive at predetermined positions, taking into consideration adhesiveness with the rubber layer 1c, if desired. At that time, the inner cylinder 1a is moved by the protrusion 4c in the receiving part 4, and the outer cylinder 1b is moved by the receiving part 4.
The inner protrusion 4d and the inner periphery of the recess 4a restrict the position so that when the mold is dropped into the cavity recess 13a of the lower mold 13, it falls to a predetermined position (see FIGS. 6 and 10). And handle 5
b, push the shutter 5 backward until it is regulated by the stoppers 5d, close the opening 4b in the receiving part 4 of the receiving plate 3, and turn the setting jig 2 over again.

After that, when opening the mold, the support part 22a of the surface plate 22
The inner cylinder 1a and the outer cylinder 1b are inserted into the respective receiving parts 4 onto the upper surface of the lower mold 13 which is pushed out by the pusher 24.
(See FIG. 7). At that time, the receiving plate 3 in the setting jig 2
The pin 3b fits into the recess 13c of the lower mold 13,
A receiving portion 4 is arranged above each cavity recess 13a.

Then, pull the shutter 5 forward using the handle 5b of the shutter 5 until it is regulated by the stoppers 5c, align the hole 5a of the shutter 5 with the opening 4b of the receiving part 4 in the receiving plate 3, and then The inner cylinder 1a and the outer cylinder 1b in the mold 4 are dropped, and all of the inner cylinder 1a and the outer cylinder 1b are set simultaneously into the cavity recess 13a of the lower mold 13 (see FIGS. 8 and 11). At that time, the inner cylinders 1a each have set pins 13b in the cavity recesses 13a.
, the outer cylinder 1b has a cavity recess 13a, respectively.
Since the inner cylinder 1a and the outer cylinder 1b, which are inserts, can be set in a predetermined position while being regulated by the inner peripheral surface, and can be set into all the cavity recesses 13a at the same time, the setting time can be significantly shortened.
By the way, in the rubber bushing 1 like the example,
Conventionally, when setting 16 inner and outer cylinders 1a and 1b,
It used to take at least 35 seconds, but if you do it like the example
I was able to do it in less than 10 seconds.

Thereafter, the setting jig 2 is removed from the lower mold 13, the lower mold 13 is moved backward to a predetermined position by a pusher (not shown), the mold is closed by the operation of the hydraulic ram 23, and the rubber is poured into the cavity 14. The rubber layer 1 is injected and vulcanized between the inner cylinder 1a and the outer cylinder 1b.
The rubber bushing 1 filled with c is molded and vulcanized (see Figures 9 and 12). At that time, multiple inner and outer cylinders 1
a and 1b are the respective cavity recesses 1 at the same time.
3a, the time for heating by heat conduction from the lower mold 13 before molding and vulcanization is approximately the same for the inner and outer cylinders 1a and 1b, respectively, and the inner and outer cylinders 1a and 1b are The temperature becomes constant, and the quality of the rubber bushings 1 that are molded and cured can be stabilized. In addition, the setting jig 2 removed from the lower mold 13 during molding and vulcanization is
New inner cylinder 1a and outer cylinder 1b for the next molding and vulcanization
When opening the mold, after taking out the product,
Since the inner and outer cylinders 1a and 1b can be immediately set on the lower mold 13, efficiency is high.

After molding and vulcanization, the mold is opened and the product is taken out, and the setting jig 2 in which the inner cylinder 1a and outer cylinder 1b are newly arranged as described above is set in the lower mold 13,
By repeating the steps described above, the manufacturing time can be shortened and a rubber bushing 1 with stable quality can be efficiently obtained.

Note that the setting jig 2 used in the example is shown to set an insert in which the inner cylinder 1a is located in the outer cylinder 1b, but it is also possible to set a rubber product with one insert, for example, without an inner cylinder 1a. In the case of molding and vulcanization, the setting jig may be formed so that the upper part of the receiving part 4 is opened and the insert is placed from above without turning the setting jig over.Of course, the insert to be set may be is not limited to a cylindrical shape.

[Brief explanation of drawings]

Figures 1 and 2 are perspective views showing the setting jig used in the embodiment of this invention as seen from above and below, respectively, and Figures 3 and 4 are perspective views and longitudinal sections showing the rubber bushing manufactured in the embodiment, respectively. 5 is a partial longitudinal sectional view of the setting jig, FIGS. 6 to 9 are perspective views showing the manufacturing process of the embodiment in order, and FIG. FIG. 11 is a partial sectional view showing the state in which the inner and outer cylinders are set in the lower mold cavity recess of the embodiment, and FIG. 12 is a partial sectional view of the mold during molding and vulcanization of the embodiment. FIG. 1... (Rubber product) Rubber bushing, 1a...
(Metal insert) Inner cylinder, 1b... (Metal insert) Outer cylinder, 2... Setting jig, 4... Receiving part,
4b... opening, 5... shutter, 5a... hole,
11... Mold, 12... Upper mold, 13... Lower mold, 1
2a, 13a... Cavity recess.

Claims (1)

[Claims] 1. A method for manufacturing a rubber product having metal inserts using a multi-cavity mold, in which a predetermined number of metal inserts can be arranged corresponding to the arrangement of a plurality of cavity recesses when the mold is opened. Using a setting jig equipped with a receiving part and a shutter that simultaneously opens the bottom of the receiving part and drops the metal insert disposed in the receiving part, The setting jig with the metal inserts arranged in the receiving part is placed in advance in the receiving part, the shutters are opened and the metal inserts are dropped and set into the respective cavity recesses, and after the mold is closed. A method for producing a rubber product having a metal insert, which is produced by molding and vulcanizing.