JP3250214B2 - Method of manufacturing waterproof connector and mold for manufacturing the same - Google Patents

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 waterproof connector in which a sealing packing is provided on a fitting peripheral surface of a housing, and a manufacturing die.

[0002]

2. Description of the Related Art In manufacturing a waterproof connector of this type in recent years, the purpose of the present invention is to simplify a manufacturing process and reduce manufacturing costs. It has been proposed to. As an example thereof, one described in Japanese Patent Publication No. 5-23030 is conventionally known. This is shown in FIG.
As shown in FIG. 21 and FIG. 21, a cavity b is provided in a fixed mold a, while two types of core molds d and e are provided in a movable mold c. First, as shown in FIG. The mold is closed with the core mold d having entered the cavity b,
The housing x is formed by filling a resin material into the housing forming space f formed therebetween. Thereafter, the mold is opened once to remove the first core mold d, and then the second core mold e is made to correspond to the cavity b by, for example, rotating the movable mold c. By closing the mold again, as shown in FIG. 21, the second core mold e enters the cavity b to form a packing molding space g with the molded housing x.
The packing z is formed by filling a rubber material therein.
Finally, after the mold has been opened, the product is provided with a packing z on the inner periphery of the base of the hood y in the housing x as shown in FIG.

[0003]

However, in the conventional method, after the housing x is molded, the first core mold d is removed and the second core mold e for packing molding is re-entered. I have. Here, the second core mold e enters after the molded housing x is cooled and hardened, but when the housing x is hardened, a shrinkage phenomenon occurs, so that the second core mold e is tightly packed in the housing x. It is difficult for the second core mold e to be fitted to the second member, and a gap is easily formed. Then, when molding the packing z, there is a possibility that the rubber material may enter the gap to form burrs. When burr is formed,
When the male and female housings are fitted, burrs are turned up, causing a phenomenon such as riding on the inner periphery of the packing z, and there is a concern that the sealing performance may be impaired. A projection such as a lip is usually formed on the inner periphery of the packing z, and an undercut portion is formed between the packing z and the second core mold e. When it is pulled out, there is a possibility that the packing z may be pulled back.

[0004] The present invention has been completed based on the above-described circumstances, and an object thereof is to form a housing and a packing together in the same mold.
The purpose is to allow the packing to be formed into a regular shape without burrs or the like. Another object of the present invention is to reliably prevent the packing from being pulled out when the mold is removed.

[0005]

According to a first aspect of the present invention, there is provided a method for manufacturing a waterproof connector, wherein a packing for removing a seal between the two housings is provided on a peripheral surface of a housing fitted with a mating housing. Wherein the core mold provided in the other mold enters a cavity provided in one of a pair of relatively movable molds. After closing and molding the housing by filling a resin material into a housing molding space formed between the core mold and the cavity, the part of the core mold is retracted by retreating a part of the core mold. Configure the packing molding space along the mating peripheral surface,
It is characterized in that the packing is formed by filling it with a rubber material and then the mold is opened to take out the product. The invention of claim 2 is the invention of claim 1, wherein after molding the packing, only the other part of the core mold is retracted while pressing the molded packing while leaving a part of the core mold,
After that, the mold is opened.

According to a third aspect of the present invention, there is provided a waterproof connector for manufacturing a waterproof connector in which a packing is provided on a peripheral surface of a housing fitted with a mating housing to remove a seal between the two housings. Mold
A pair of relatively movable molds is provided, one of the molds has a cavity, and the other mold has a core mold which can enter the cavity. A part of the core mold is provided so as to be able to advance and retreat with respect to the other part. When the core mold enters the cavity when the mold is closed, a housing molding space is formed between the core mold and the cavity. The present invention is characterized in that a packing molding space can be formed by retreating a part of the core mold later. A fourth aspect of the present invention is characterized in that, in the third aspect of the present invention, a retreating means for retreating only the other portion of the core mold before the mold is opened is provided.

[0007]

When the pair of molds is closed, a housing molding space is formed between the core mold and the cavity, and a resin material is filled therein. This forms the housing. Subsequently, a packing molding space is formed between the core mold and a molded housing by retreating a part of the core mold, and the packing is molded by filling a rubber material therein. When the mold is opened and protruded, a waterproof connector in which packing is provided on the fitting peripheral surface of the housing is obtained. When the packing molding space is configured, the core mold is left and only a part of it is retracted.Therefore, it is difficult for a gap to be formed between the molded housing and the core mold. It can be formed into a shape.

<Inventions of Claims 2 and 4> When the core mold is removed after the packing is formed, the other part of the core mold is held at a predetermined position by keeping the packing in a retaining state while leaving a part of the core mold. Since the mold is opened afterwards, even if there is an undercut portion between the packing and the packing, the packing is reliably prevented from being pulled out.

[0009]

Embodiments of the present invention will be described below with reference to the accompanying drawings. <First Embodiment> A first embodiment of the present invention will be described with reference to FIGS. The manufacturing object of the first embodiment is:
FIG. 8 is a simplified diagram showing a basic structure of a male waterproof connector 1 as shown in FIG. That is, the male housing 2 has a hood 6 into which a mating female connector (not shown) is fitted on the front surface of a main body 5 having a terminal housing 4 with a lance 3 provided therein. In this case, the packing 7 is mounted on the inner peripheral surface at the back end of the hood 6. The following manufacturing process will be described based on the basic structure.

The molding die of this embodiment is incorporated in an injection molding system made of different materials, and as shown in FIG.
It comprises a movable mold 11 and a fixed mold 12 which form a pair with each other. The movable mold 11 is connected to a drive mechanism (not shown), is driven to move forward and backward with a predetermined stroke in the left and right directions in the figure, and is movable toward and away from the fixed mold 12. Movable mold 1
A cavity 13 that forms the outer shape and the like of the housing 2 is formed in the molding surface of the housing 1. One stationary mold 12 is provided with a core mold 15 which can enter the above-mentioned cavity 13 concentrically. When the mold is roughly closed, a housing mold is formed between the core mold 15 and the cavity 13. A space 16 is configured (see FIG. 3). The core mold 15 further includes a cylindrical outer core 1.
7 and a solid inner core 18 fitted therein, and the two cores 17, 18 can be individually driven forward and backward via a drive mechanism (not shown).

A tapered through hole forming portion 19 is formed at a predetermined position on the distal end surface of the outer core 17 so as to form a through hole 27 into a packing forming space 26 described later. The portion 6 can protrude from a portion forming a rear wall (see FIG. 3). A lance forming portion 21 is provided on the distal end surface of the inner core 18 so as to form the lance 3 with the cavity 13 described above. Further, an outer peripheral surface of a predetermined range portion at a tip end portion of the inner core 18 is a packing molding surface 22 that forms an inner peripheral surface of the packing 7, and the packing molding surface 22 is used to form a lip of the packing 7. Corrugated.

A resin gate 24 is formed on the movable mold 11 so as to face the front end of the upper surface of the cavity 13 from the front surface thereof, and the rear wall of the hood 6 in the cavity 13 is formed from the upper surface. The rubber gate 25 is formed so as to face the portion to be molded. Subsequently, a manufacturing process using the above-described mold will be described. First, as shown in FIG. 2, both cores 17 and 18 of the core mold 15 provided on the fixed mold 12 are moved to the forward position, and the mold is closed in this state. Thereby, as shown in FIG. 3, a housing molding space 16 is formed between the core mold 15 and the cavity 13. The inner core 18
The through hole forming portion 19 provided in the housing forming space 16
Protrude into. Subsequently, as shown in FIG. 4, the housing molding space 16 is filled with molten resin from the resin gate 24 and solidified, whereby the housing 2 is molded.

Next, as shown in FIG. 5, only the outer core 17 of the core mold 15 is retracted by a predetermined dimension. As a result, the packing molding space 26 is formed along the inner peripheral surface of the rear end of the hood portion 6 in the molded housing 2. At the same time, a through hole 27 is formed so as to communicate with the rubber gate 25. Subsequently, as shown in FIG. 6, the molten rubber is filled from the rubber gate 25 through the through hole 27 into the packing forming space 26 and solidified to form the packing 7.

Next, as shown in FIG. 7, the inner core 18 is retracted while leaving the outer core 17 of the core mold 15 of the fixed mold 12. Thus, the packing molding surface 22 of the inner core 18 comes out of the inner periphery of the packing 7 in a state where the packing 7 is pressed by the outer core 17. Although the inner peripheral surface of the packing 7 has an undercut portion, the packing 7 is retained at the molding position because the outer core 17 presses the packing 7 so as not to come off.

Subsequently, when the movable mold 11 is separated and the mold is opened, the housing 2 and the packing 7 are connected to the movable mold 1.
The core mold 15 comes out while remaining in the cavity 13 of the first. Finally, the protrusion pin (not shown) mounted on the movable mold 11 is advanced, so that the packing 7 is fitted to the inner peripheral surface on the inner side of the hood 6 of the housing 2 as shown in FIG. The product is ejected and ejected. As described above, according to the present embodiment, when forming the packing molding space 26, only the outer core 17 is retracted while leaving the core mold 15 as a whole, so that the molded housing 2 and the core mold An extra gap is hardly formed between the gasket 15 and the packing 15, so that the packing 7 can be formed into a regular shape without burrs or the like. When the core mold 15 is removed after the molding of the packing 7, the inner core 18 is removed from the position of the packing 7 while holding the packing 7 in a retaining state with the outer core 17, and then the entire core mold 15 is removed. Therefore, even if the undercut between the inner core 18 and the packing 7 is severe, the packing 7 is not pulled out.

<Second Embodiment> FIG. 9 shows a second embodiment. In the second embodiment, the position where the rubber gate 29 is formed in the movable mold 11 is changed. That is, the rubber gate 29 is formed so as to face the portion of the cavity 13 where the rear wall of the hood 6 is formed from the rear side of the movable mold 11. Other structures are the same as those of the first embodiment, and similar effects can be obtained.

<Third Embodiment> FIGS. 10 and 11 show a third embodiment of the present invention. This third embodiment shows an example in which another change is added to the formation position of the rubber gate 25. The fixed mold 12 is provided with a part where the parting line PL2 protrudes forward, while the movable mold 11 is provided with a part where the parting line PL1 is retracted correspondingly. This part is the housing 2
At the corner of the back wall of the hood 6 at the opening 9 (see FIG. 11). The rubber gate 25 is formed so as to open from the retreating parting line PL1 to the inner surface of the movable mold 11.

That is, as shown in FIG. 10, after the housing 2 is molded, the outer core 17 is retracted to form the packing molding space 26, and the molten rubber is filled therein through the rubber gate 25. Thereby, the packing 7 is formed. When the product is ejected after the mold is opened, as shown in FIG. 11, the hood portion 6 is attached to the housing 2 having an opening 9 at a part of the corner of the back wall.
The waterproof connector 1 in a state where the packing 7 is fitted to the inner peripheral surface on the back side is obtained.

<Fourth Embodiment> A fourth embodiment of the present invention will be described with reference to FIGS. The second embodiment exemplifies a case where the female waterproof connector 31 is to be manufactured. As shown in FIG. 17, the female housing 32 has a main body 35 in which a terminal accommodating chamber 34 with a lance 33 is provided. The hood portion 36 is provided so as to cover up to the front, and has a structure in which a packing 37 is attached to the outer peripheral surface on the far side of the main body portion 35 in the hood portion 36.

In the fourth embodiment, a molding die as shown in FIG. 12 is provided to form the female waterproof connector 31 described above, but the basic structure is the same as that of the first embodiment. In the following, only the structure of the different portion will be described, and the portions having the same functions as those of the first embodiment will be described in the first embodiment.
The description of the embodiment will be appropriately omitted by giving the reference numeral with the suffix A to the reference numeral of the embodiment. The fixed mold 12A is provided with a triple-structure core mold 40, in which a tubular intermediate core 42 is fitted in a tubular outer core 41 so as to be able to advance and retreat, and further has a solid state inside. The inner core 43 is fixedly provided. The corrugated packing forming surface 22 </ b> A for forming the lip of the packing 37 is formed on the inner peripheral surface of the distal end portion of the outer core 41. In addition, the through hole forming portion 19A
Are formed on the distal end surface of the intermediate core 42.

The manufacturing steps in the fourth embodiment are as follows. When the mold is closed from the state shown in FIG. 12, a housing molding space 16A is formed between the core mold 40 and the cavity 13A as shown in FIG.
2 has a through-hole forming portion 19A that projects into the housing forming space 16A. Subsequently, as shown in FIG. 14, the molten resin is supplied from the resin gate 24A to the housing molding space 16A.
The housing 32 is molded by filling and solidifying A.

Next, as shown in FIG. 15, only the intermediate core 42 of the core mold 40 is retracted by a predetermined dimension. Thereby, the hood portion 36 in the molded housing 32 is formed.
A packing forming space 26A is formed along the outer peripheral surface on the inner side of the main body 35 inside. At the same time, a through hole 27A is formed to communicate with the rubber gate 25A. Subsequently, as shown in FIG. 16, the molten rubber is filled from the rubber gate 25A through the through hole 27A into the packing forming space 26A, and solidified to form the packing 37.

Subsequently, when the movable mold 11A is separated and the mold is opened, the core mold 40 comes out with the housing 32 and the packing 37 remaining in the cavity 13A of the movable mold 11A. Finally, as the protruding pin provided on the movable mold 11A advances, as shown in FIG. 17, the packing 37 is fitted on the outer peripheral surface on the inner side of the main body 35 in the hood 36 of the housing 32. The product in the state is ejected and ejected.

As described above, according to the fourth embodiment, when the packing molding space 26A is formed, the entire core mold 40 is left as it is, and only the intermediate core 42 is retracted. An extra gap is hardly formed between the housing 32 and the core mold 40, and similarly, the packing 37 can be formed into a regular shape without burrs or the like. In the case where the core mold 40 is removed after the molding of the packing 37, the outer core 41 is retracted first while the packing 37 is kept in the retaining state while leaving the intermediate core 42 from the state shown in FIG. External core 41
Even when the undercut between the seal 37 and the packing 37 is tight, the packing 37 is not pulled out.

<Fifth Embodiment> FIGS. 18 and 19 show a fifth embodiment.
1 shows an embodiment. In the fifth embodiment, a rubber gate 2 is provided.
The example which changed the formation position of A is shown. Parting line PL2 is attached to outer core 41 of fixed mold 12A.
Of the movable mold 1
1A is provided with a part in which the parting line PL1 is retracted correspondingly. This portion functions to open an opening 39 at a part of the corner of the back wall of the hood portion 36 in the housing 32 (see FIG. 19). Then, the parting line PL that is retracted from the movable mold 11A.
A rubber gate 25A is formed so as to open from 1 to the inner surface.

That is, as shown in FIG. 19, after the housing 32 is formed, the intermediate core 42 is retracted,
When the packing forming space 26A is formed, the packing 37 is formed by filling molten rubber through the rubber gate 25A. When the product is ejected after the mold is opened, as shown in FIG. 19, the housing 32 having an opening 39 at a part of the corner of the rear wall is located at the back of the main body 35 in the hood 36. The waterproof connector 31 with the packing 37 fitted on the side outer peripheral surface is taken out.

<Other Embodiments> The present invention is not limited to the embodiments described above and illustrated in the drawings. For example, the following embodiments are also included in the technical scope of the present invention. In addition, various changes can be made without departing from the scope of the invention. (1) In the first embodiment, depending on the shape of the lip of the packing 7, the frictional resistance between the formed packing 7 and the housing 2, and the like, the inner core 18 and the packing 7
Even if there is an undercut portion between the two, there is a case where there is no possibility that the packing 7 is dragged out with the operation of pulling out the inner core 18. In such a case, the step of retracting only the inner core 18 while leaving the outer core 17 shown in FIG. 7 is omitted, and the mold opening is performed following the molding step of the packing 7 shown in FIG. It may be.

(2) In the movable mold 11A of the fourth embodiment, similarly to the second embodiment, a rubber gate is formed from the back side of the movable mold 11A to the back wall of the hood portion 36 in the cavity 13A. Alternatively, it may be formed so as to face a portion to be formed. (3) With respect to the mold, the fixed side and the movable side may be opposite to those in the above embodiment.

[Brief description of the drawings]

FIG. 1 is a perspective view of a waterproof connector according to a first embodiment of the present invention as viewed from the back.

FIG. 2 is a cross-sectional view of the molding die according to the first embodiment in an open state.

FIG. 3 is a sectional view showing a state in which a mold is closed.

FIG. 4 is a cross-sectional view of a state where a housing is formed.

FIG. 5 is a sectional view showing a state in which a packing molding space is formed.

FIG. 6 is a cross-sectional view of a state where a packing is formed.

FIG. 7 is a sectional view showing a state in which only the inner core is retracted first;

FIG. 8 is a sectional view of a state where a product is taken out.

FIG. 9 is a cross-sectional view of a state where a product according to the second embodiment is taken out.

FIG. 10 is a sectional view of a state in which a packing molding space according to a third embodiment is configured.

FIG. 11 is a sectional view of a state where the product is taken out.

FIG. 12 is a sectional view of a molding die according to a fourth embodiment of the present invention in an open state.

FIG. 13 is a sectional view showing a state in which the mold is closed.

FIG. 14 is a cross-sectional view of a state where a housing is formed.

FIG. 15 is a sectional view showing a state in which a packing molding space is formed.

FIG. 16 is a cross-sectional view of a state where a packing is formed.

FIG. 17 is a sectional view showing a state where a product is taken out.

FIG. 18 is a sectional view of a state where a packing molding space according to a fifth embodiment is configured.

FIG. 19 is a sectional view of a state where the product is taken out.

FIG. 20 is a sectional view showing a state in which a housing molding space is formed in a conventional example.

FIG. 21 is a sectional view showing a state in which the packing molding space is formed.

FIG. 22 is a sectional view of the molded product.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Waterproof connector 2 ... Housing 7 ... Packing 11 ... Movable mold 12 ... Fixed mold 13 ... Cavity 15 ... Core mold 16 ... Housing molding space 17 ... Outer core 18 ... Inner core 26 ... Packing molding space 11A ... Movable mold 12A: fixed mold 13A: cavity 16A: housing molding space 26A: packing molding space 31: waterproof connector 32 ... housing 37 ... packing 40 ... core mold 41 ... outer core 42 ... intermediate core 43 ... inner core

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-10-223301 (JP, A) JP-A-8-162251 (JP, A) JP-A-8-162204 (JP, A) JP-A-8-162 37075 (JP, A) JP-A-6-310201 (JP, A) JP-A-5-47436 (JP, A) JP-A-3-219578 (JP, A) JP-A-3-53913 (JP, A) JP-A-63-221568 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) H01R 43/00 H01R 13/52 H01R 43/24

Claims (4)

(57) [Claims] 1. A method for manufacturing a waterproof connector, comprising: a housing provided with a packing for sealing between two housings on a peripheral surface of the housing fitted with a mating housing, wherein a pair of relatively movable molds is provided. The mold is closed in a state where the core mold provided in the other mold has entered the cavity provided in one of the molds, and the housing formed between the core mold and the cavity is formed. After the housing is molded by filling the space with a resin material, a packing molding space is formed along the fitting peripheral surface of the molded housing by retracting a part of the core mold, and the rubber is formed here. A method of manufacturing a waterproof connector, characterized in that a packing is formed by filling a material, and then a mold is opened to take out a product. 2. The method according to claim 1, wherein after molding the packing, only the other part of the core mold is retracted while holding the molded packing while leaving a part of the core mold, and then the mold is opened. The method for manufacturing the waterproof connector described in the above. 3. A mold for manufacturing a waterproof connector in which a packing is provided on a peripheral surface of a housing that is fitted to a mating housing, and a seal for sealing between the housings is provided. A mold is provided, and one of the molds has a cavity, and the other mold has a core mold which can enter the cavity. A housing molding space is formed between the core mold and the cavity when the core mold enters the cavity when the mold is closed, and a part of the core mold retreats after the housing is molded. A mold for manufacturing a waterproof connector, characterized in that a packing molding space can be formed by doing so. 4. The mold for manufacturing a waterproof connector according to claim 3, further comprising retreat means for retreating only the other part of the core mold before the mold is opened.