JPH11156858A - Mold device and molding method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent an insert part from being defective in shape. SOLUTION: An insert part 33 is attached to a core 13 installed between a pair of openable molds 11, 12. When a rubber material is packed into a cavity 14 formed between the molds 11, 12 and the core 13, the insert part 33 is integrated into the molding 34 formed from the rubber material. In the packing of the rubber material, the insert part 33 is held not to be separated from the core 13.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mold apparatus and a molding method for integrating a thermoplastic resin insert part and a molded article molded from an unvulcanized rubber material.

[0002]

2. Description of the Related Art As this type of molded article, for example, FIG.
As shown in FIG. 1, there is a connector 31 provided at one end of a wire harness 32. The connector 31 is composed of a synthetic resin connector housing 33 as an insert part and a rubber grommet 34 for preventing the wire harness 32 from being damaged, and the two 33 and 34 are integrated. Upper and lower recesses 33a and 33b are formed outside the connector housing 33, and a circumferential groove 33c is formed inside.

FIG. 4 shows a mold apparatus for integrating the connector housing 33 and the grommet 34. That is, the upper and lower molds 35 and 36 that can be opened and closed, and a core 37 provided between the molds 35 and 36 are configured.
When the molds are clamped, a cavity 38 is formed by the two molds 35 and 36 and the core 37. And both upper and lower mold 35,
In a state where 36 is opened, a connector housing 33 that has been molded in advance is inserted and mounted on the base end of the core 37. afterwards,
The upper and lower dies 35 and 36 are closed, and the cavity 39 is filled with a rubber material as an unvulcanized rubber material under high pressure from the gate 39, and both dies are heated. Then, the rubber material is vulcanized and cured by heat to form the grommet 34, and the grommet 34 and the connector housing 33 are integrated to manufacture the connector 31. Then, the upper and lower molds 35 and 36 are opened, and the connector 31 is taken out from the core 37.

[0004]

However, in the mold apparatus shown in the prior art, since the upper and lower dies 35, 36 are hot when the grommet 34 is molded, the connector housing 33 is not connected to the upper and lower dies 35, 36. And heat from rubber materials. In this state, when a rubber synthetic resin connector housing 33 receives a filling pressure of a rubber material,
Since the connector housing 33 has a space defined by the upper and lower concave portions 33a and 33b and the peripheral groove 33c, the connector housing 33 is easily deformed. Accordingly, there is a problem that the shape of the connector housing 33 becomes defective.

Further, as shown in an enlarged view in FIG. 4, with the deformation of the connector housing 33, the space between the connector housing 33 and the core 37 or the upper and lower concave portions 33a, 33 is formed.
In some cases, the rubber material flowed into b to generate burrs B1 and B2. If the burr B1 is provided on the inner peripheral surface of the connector housing 33, the mountability of a connector (not shown) inserted and connected to the connector housing 33 deteriorates. Also, the presence of the burrs B2 in the upper and lower concave portions 33a, 33b leads to a reduction in appearance quality.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and an object of the present invention is to prevent insert components from becoming defective in shape and to prevent burrs.

[0007]

In order to achieve the above object, according to the first aspect of the present invention, an insert part is mounted on a core provided in a mold, and both the mold and the core are mounted. By filling an unvulcanized rubber material in a cavity formed between the mold part and the mold device configured to integrate the insert part and a molded product molded from the unvulcanized rubber material, The gist is to provide a holding means for holding the insert component so as not to be separated from the core.

According to a second aspect of the present invention, in the mold apparatus according to the first aspect, the holding means can be fitted into the opening to fill the opening formed in the insert part. It is a gist that it is.

According to a third aspect of the present invention, in the mold apparatus according to the second aspect, the holding means is formed integrally with the core. According to a fourth aspect of the present invention, an insert component is mounted on a core provided between a pair of molds that can be opened and closed, and unvulcanized is formed in a cavity formed between both molds and the core. In a molding method in which a rubber material is filled to integrate an insert part and a molded product molded with the unvulcanized rubber material, when filling the cavity with the unvulcanized rubber material, The gist of the invention is that the insert part is held so as not to separate from the child.

According to a fifth aspect of the present invention, in the molding method of the fourth aspect, a holding means for preventing the insert part from being separated from the core is inserted into the opening formed in the insert part. The gist is that it was done.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to the drawings. Since the connector 31 described in the prior art has the same configuration in this embodiment, the description of the parts already described in the prior art will be omitted and the same reference numerals will be given.

As shown in FIGS. 1 and 2, a mold apparatus for manufacturing the connector 31 includes upper and lower molds 11 that can be opened and closed.
12 and a core 13 provided between the two dies 11 and 12. Molding surfaces 11a and 12a are formed on the lower surface of the upper mold 11 and the upper surface of the lower mold 12, respectively. When the molds 11 and 12 are clamped, both molding surfaces 11a and 12a are formed.
a and the outer peripheral surface of the core 13 form the cavity 14 for forming the grommet 34. A gate 15 communicating with the cavity 14 is formed on the upper mold 11 from the upper surface, and a rubber material as an unvulcanized rubber material is filled into the cavity 38 through the gate 15.

A circumferential groove 33c is formed in the base 13a of the core 13.
An annular ridge 16 as a holding means having the same width as that of the connector housing 33 is integrally formed, and the annular ridge 16 is a peripheral groove (opening) 33 of the connector housing 33 inserted and mounted on the core 37.
c can be fitted. Also, connector housing 3
A holding piece 17 as a holding means having the same width as the upper and lower recesses 33a and 33b can be fitted into the upper and lower recesses (openings) 33a and 33b of the core 3. It is configured separately. This holding piece 17 is
It is made of a material having a higher thermal expansion than the cores 1 and 12 and the core 13, and is made of aluminum in the present embodiment. When the upper and lower dies 11 and 12 are clamped, the inner peripheral edge of the connector housing 33 is held by the annular ridge 16 and the holding piece 17 so as not to be separated from the core 13.

The connector housing 33 and the grommet 34 are integrated as follows using the above-described mold apparatus. That is, as shown in FIG.
With the core 12 opened, a connector housing 33 made of synthetic resin, which has been molded in advance, is inserted and mounted on the core 13. With this mounting, the annular ridge 16 is inserted and fitted into the peripheral groove 33 c of the connector housing 33, and the entire space of the peripheral groove 33 c is filled with the annular ridge 16. Thereafter, the holding pieces 17 are provided in the upper and lower concave portions 33a and 33b of the connector housing 33.
Are respectively inserted and fitted, and the entire space of the upper and lower concave portions 33a and 33b is filled with the holding piece 17.

Next, as shown in FIG.
36 is closed, the rubber material is filled under high pressure into the cavity 14 from the gate 15, and both dies are heated. Then, the rubber material is vulcanized and cured by heat, and the grommet 3
4 is formed, and the grommet 34 and the connector housing 33 are integrated.

When the rubber material is filled with high pressure, the internal spaces of the upper and lower concave portions 33a and 33b in the connector housing 33 are filled with the holding pieces 17, respectively, and the internal space of the circumferential groove 33c is formed as an annular ridge. 16, the degree of freedom for the deformation of the connector housing 33 is restricted. Then, when the upper and lower dies 11 and 12 are opened and compressed air is sent between the core 13 and the grommet 34, the grommet 34 is separated from the core 13. In this state, the connector 31 is removed from the mold by pulling out the core 13 from the grommet 34.

The effects that can be found from the present embodiment will be described below. In the state where the mold is clamped, the connector housing 3 is attached to the core 13 by the annular ridge 16 and the holding piece 17.
The inner peripheral edge of No. 3 was not separated. Therefore, the degree of freedom of deformation is restricted even when the connector housing 33 receives a high filling pressure of the rubber material while receiving heat. Therefore, it is possible to prevent the connector housing 33 from becoming defective in shape.

Further, as the deformation of the connector housing 33 is prevented, no gap is formed between the inner peripheral surface of the connector housing 33 and the outer peripheral surface of the core 13, so that the rubber material is filled in the gap. Stop flowing. Therefore, the generation of burrs due to the rubber material can be reliably prevented.

By fitting the holding piece 17 into the upper and lower concave portions 33a and 33b of the connector 31, and fitting the annular ridge 16 into the circumferential groove 33c, the entire space of each portion 33a to 33c is filled. Therefore, each part 33a-33c
The rubber material 18 does not flow into the device. Therefore, the generation of burrs due to the rubber material can be reliably prevented.

Since the holding piece 17 is inserted into the upper and lower recesses 33a and 33b of the connector 31 and fitted, and the annular ridge 16 is inserted and fitted into the peripheral groove 33c, the core can be easily operated. It is possible to prevent the inner peripheral edge of the connector housing 33 from being separated from the connector 13.

Since the annular ridge 16 fitted into the circumferential groove 33c of the connector housing 33 is formed integrally with the core 13, the mounting of the connector housing 33 on the core 13 and the annular projection Article 16 can be inserted. Therefore,
Since the operation of inserting the annular ridge 16 need not be performed after the connector housing 33 is inserted, the operation efficiency can be improved.

Since the holding piece 17 is made of aluminum, it has a higher thermal expansion property than both the iron dies 11 and 12 and the core 13. Therefore, at the time of insertion at normal temperature, the holding pieces 1 with respect to the upper and lower concave portions 33a and 33b of the connector housing 33 are provided.
7, the insertion clearance can be increased, and the insertion operation can be easily performed.

The above embodiment may be configured, for example, as follows. In the above-described embodiment, the connector 31 is embodied. However, the present invention is embodied in something other than the connector 31. In this case, the material of the insert component is rubber, and the unvulcanized rubber material integrally molded with the insert component is resin. thing.

The entire space of each part 33a to 33c is filled with the annular ridge 16 or the holding piece 17, but if the shape of the connector housing 33 is not deformed, the whole space of each part 33a to 33c is not filled. You may.

The material of the holding piece 17 is changed to copper, stainless steel or the like. Next, technical ideas other than the inventions described in the claims, which can be understood from the above embodiments, will be described below together with their effects.

(1) The mold apparatus according to claim 2, wherein the holding means is made of a material having low thermal expansion. With this configuration, the holding means can be easily fitted into the recess formed in the insert part.

(2) The molding method according to claim 4 or 5, wherein the insert part is mounted on the core and, at the same time, the insert part is held so as not to be separated from the core. According to this method, since it is not necessary to perform the operation of inserting the holding means after inserting the insert component,
Work efficiency can be improved.

[0028]

According to the first or fourth aspect of the present invention,
The insert parts are not separated from the core, so that even if the insert parts are subjected to the filling pressure of the unvulcanized rubber material while receiving heat at a high temperature, the insert parts can be prevented from becoming defective in shape. And the occurrence of burrs can be prevented.

According to the second aspect of the present invention, when the mold is clamped, the recess formed in the insert part is filled by the holding means, so that the unvulcanized rubber material is prevented from flowing into the recess. it can. Therefore, the generation of burrs due to the unvulcanized rubber material can be reliably prevented.

According to the third aspect of the present invention, the holding means can be fitted and mounted in the opening of the insert part at the same time that the insert part is mounted on the core. Can be improved.

According to the fifth aspect of the present invention, it is only necessary to insert the holding means into the opening of the insert part.
With a simple operation, it is possible to prevent the insert part from separating from the core.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of a mold device when a mold is clamped.

FIG. 2 is a cross-sectional view of the mold apparatus when the mold is opened.

FIG. 3 is a perspective view of a connector.

FIG. 4 is a cross-sectional view of a mold apparatus according to the related art.

[Explanation of symbols]

11 ... upper mold, 12 ... lower mold, 13 ... core, 14 ... cavity, 16 ... annular ridge (holding means), 17 ... holding piece (holding means), 33 ... connector housing (insert part)

Continued on the front page (51) Int.Cl. ⁶ Identification symbol FI // B29K 21:00 105: 24

Claims (5)

[Claims] An insert component is mounted on a core provided in a mold, and an unvulcanized rubber material is filled in a cavity formed between the two dies and the core. In a mold apparatus in which a part and a molded article molded from the unvulcanized rubber material are integrated, a mold apparatus provided with holding means for holding an insert part so as not to be separated from the core . 2. The mold apparatus according to claim 1, wherein said holding means is fittable into an opening formed in said insert part so as to fill said opening. 3. The mold apparatus according to claim 2, wherein said holding means is formed integrally with a core. 4. An insert component is mounted on a core provided between a pair of molds that can be opened and closed, and an unvulcanized rubber material is filled in a cavity formed between the molds and the core. By doing so, in the molding method in which the insert component and the molded product molded from the unvulcanized rubber material are integrated, when filling the cavity with the unvulcanized rubber material, the core A molding method that holds insert parts so that they do not separate. 5. The molding method according to claim 4, wherein a holding means for preventing the insert part from separating from the core is inserted into an opening formed in the insert part.