JPH0353913A - Manufacture of waterproofing connector housing - Google Patents

Abstract

PURPOSE:To prevent the occurrence of flashes in a molded housing by supplying a protrusion, which is formed on the boundary line of an elastic sealing forming part at a housing side, to contact with a secondary molding die before curing completely, and crushing it in correspondence with the inner surface of cavity of the secondary molding die, and further, the gap between parts completely. CONSTITUTION:Slide cores 4, 4' are combined each other with respect to a core cartridge 3, and the inner surfaces of secondary molding cavities 7, 7' are brought into contact with the protrusion A3 of a skirt pat A1, and then crushed. And, a fixed die is combined with the inner surface of the secondary molding cavities 7, 7' having spaces corresponding to allergic sealing forming parts and brought into contact with protrusions A6, A7, and then these protrusions are crushed. In this manner, the gap on the boundary line of spaces corresponding to the elastic sealing forming part constituted of being closed by the housing main body A, the secondary molding cavities 7, 7' of the fixed die 2 and the housing main body A, slide cores 4, 4' is filled. In this state, an elastic material is injected into aforementioned spaces from a gate 8 via the passage A2 of the skirt A1.

Description

DETAILED DESCRIPTION OF THE INVENTION 1. Industrial Field of Application The present invention provides a method for providing watertightness to the part by interposing it between the part and the part of the sealer which is to be fitted with the part of the part to be fitted with the part of the part to be mated. The present invention relates to a method of forming a retaining elastic seal ring.

2. Prior art A conventional manufacturing method of this type is disclosed in Japanese Patent Application Laid-Open No. 63-2215.
There is one disclosed in No. 68.

In this manufacturing method, in order to mold the pushable seal ring inside the skirt part, first, in the primary molding, the male and female molds are closed in the axial direction of the housing to be molded, and then the molds are assembled into the female mold and moved in the above direction. A passage for introducing elastic material into the seal ring-shaped part formed inside the skirt part is formed in the skirt part using a slide mold that slides in the direction of Instead, the mold was closed with another male mold having a cavity corresponding to the elastic seal ring forming portion described in -E, and the elastic material was injected from the retracted passage of the slide mold.

3. Problems with the Prior Art In order to form an elastic seal ring by this method, it is necessary to form the seal ring using a material suitable for injection molding.

By the way, the material P+ suitable for injection molding requires the use of highly fluid elastic materials such as liquid silicone and thermoplastic elastomer, so the housing obtained by primary molding is retained during secondary molding. The female mold and the male mold having a cavity corresponding to the seal ring shape or part are closed together, and the housing and the male mold are brought into contact outside the boundary line except for the seal ring forming part. -12 marking material 1' from the passage provided in the skirt part mentioned above.
If -I is enlarged, since the housing is obtained by molding, there will be some variation in dimensional accuracy, and there is a possibility that material will flow out from the joint between the housing and the male mold.

4. Means for Solving the Problems In view of the above-mentioned drawbacks, the present invention first provides an I.
In order to flow the 7tI material from the outside of the skirt part to the seal ring forming part inside the skirt part, f1 (and a passage that holds a part of the elastic seal ring formed in that part when the elastic material hardens) is used. , a protrusion is formed on the housing main body that is connected to the boundary line -L of the seal ring forming portion of the housing and is provided for contact with a mold for secondary molding, and the housing is subjected to secondary molding. The mold is closed using a core car I-Lissi on a movable mold that holds the housing, a fixed mold with a cavity corresponding to the seal ring forming part, and a pair of slide cores located on both sides of the core cartridge, and the housing and slide are closed. The core and the fixed mold are brought into contact with each other on the boundary line thereof except for the seal ring forming part, and the above-mentioned protrusion is crushed to fill the gap on the boundary line, and then the above-mentioned part is inserted through the passage provided in a part of the scar l. By injecting the material mentioned above into the void space and forming a seal ring in that part, the above-mentioned drawbacks are eliminated, and the primary molding and secondary molding are performed continuously in one mold. The housing body is subjected to secondary molding before it is completely hardened so that the strips are easily soaked.

5. Since primary molding and secondary molding are performed continuously in one mold, the protrusions formed on the boundary line of the elastic seal ring forming part of the housing are ready for secondary molding before they are completely individualized. It is brought into contact with the mold and crushed in correspondence with the inner surface of the cavity of the secondary mold, completely filling the gap between the parts.

In this state, when the Yatake material is injected into the elastic seal ring shape part from the passage formed in the skirt part, even with its high fluidity, the elastic material flows from the joint between the housing body and the primary mold. does not flow out.

6. Embodiment FIGS. 1 to 4 illustrate an example of the first invention.

Figures 1 (A) and (B) are diagrams showing how the movable mold 1 and the fixed mold 2 oppose each other, and the movable mold 1 moves forward on the opposing surfaces.・Retreating core strength-
1, a ridge 3, and slide cores 4, 4- which are located on both sides of the trajectory of the core cartridge 3, move forward or backward, and are combined with the stationary core cartridge 3.

9 The core cartridge 3 has a cavity 5 corresponding to a part of the connector housing main body A.

The slide cores 4, 4- have a pair of primary molding cavities 6, 6'' and a pair of secondary molding cavities 7, 7'', and the primary molding cavities 6, 6- Scar 1 part A of connector housing body A
1 through i? fiA2 and eido passage A
One of the secondary molding cavities 7, 7- has a corresponding inward direction to form a protrusion A3 that extends and protrudes so as to surround the opening at the peripheral edge of the external opening L1 of the second molding cavity 7, 7-. A gate 8 is provided at the external opening of the passage A2 for injecting an elastic material C such as liquid silicone or thermoplastic elastomer into the skirt portion through the passage A2.

The fixed mold 2 has a cavity 9 for primary molding and a cavity 10 for secondary molding. Two step walls A4 and A5 facing toward the front of the skirt portion along the circumferential direction of the portion A1, and a protrusion A6 continuous and protruding in the circumferential direction of the skirt portion A1 on the step wall.
, A7, and the secondary molding A/Yabity 10 has an inner surface corresponding to the cavity corresponding to the elastic seal ring forming portion.

Therefore, in manufacturing waterproof connectors, the core force must be -1
The herriage 3 is initially attached and stopped at M, and combined with the slide cores 3, 3- located on both sides, the mold is closed with the fixed mold 2, and then the resin material is injected.

A passage A that passes through the skirt portion A1 of the connector housing body A in the radial direction on the inner surface of each cavity.
2. A protrusion A3 protruding from the periphery of the external opening of the passage A2 in a continuous manner with the sandbag surrounding the opening, and a protrusion A3 extending along the radial direction of the skirt part on the boundary line of the elastic seal ring forming part near the internal opening of the passage A2. The front side of the skirt part is facing forward (the two step walls A4 and A5 and the protrusions A6 and A7 that protrude continuously in the circumferential direction of the skirt part 11 on the step walls A4 and A5)
form. (See Figure 2) Next, after waiting for the resin material to solidify, first move the movable mold 1, then move back the slide cores 3, 3'', and then move the core cartridge 3 to the housing body A while holding it. In this state, the slide cores 3, 3- are removed from the primary molding cavities 6, 6.
Q' is moved between the secondary molding cavities 7, 7-.

In the secondary molding, the slide cores 3 and 3 are again
1. In combination with the ridge 3, the inner surfaces of the cavities 7, 7- for secondary molding are brought into contact with the protrusion A3 of the skirt portion A1 to crush it.

Further, the fixed mold 13 is combined with the secondary molding cavities 7, 7, which have hollow spaces corresponding to the elastic seal ring forming portions, and is brought into contact with the protrusions A6, A7, and these protrusions are crush.

Thus, the housing body 8, the secondary molding cavities 7, 71 of the fixed mold 2, the housing body A, the slide cores 4, 41, and the empty space corresponding to the elastic seal ring forming portion to be closed and formed. 12 gaps on the border are filled.

V on the boundary line of the above-mentioned space between the housing body A and each mold
>; With the distance between t set, the slide cores 4, 4
An elastic material is injected into the -12 space through the passage A2 of the skirt portion A1 from the gates 1 and 8 provided at -1. (
(See Figure 3) After waiting for the elastic material to solidify, move the movable mold A and the slide cores 4, 4'' back, and open the external opening of the skirt portion A1 with the solidified elastic material C remaining in the passage A2. The seal ring E is molded into the A skirt portion Al of the housing body.

(See Figure 4) After the housing body A is taken out, the core cartridge 3 is returned to its initial position and used for the next molding.

6 to 9 illustrate an example of the second invention.

Figures 5 (A) and (B) show the movable mold 11 and the fixed mold 1.
2 is a diagram showing the surfaces facing the respective mating molds,
The movable mold 11 has a core force-1-ridge 13 rotatably mounted on its surface.
Pj is being done.

Hole-shaped cavities 14 and 14- corresponding to a portion of the connector housing B are formed in the core cartridge 13 at positions symmetrical with respect to its rotation axis.

On the surface of the fixed mold 12 are a primary molding cavity 15 and a secondary molding cavity]6, these cavities 15.
, a pair of slide cores 17, 17 facing each other with 16 in between.
18, 18- are provided.

The primary molding cavity l5 extends along the circumferential direction of the skirt portion B1 on the boundary line of the elastic seal ring forming portion near the internal opening of the passage B3 that penetrates in the radial direction in the skirt portion B1 of the connector housing B. It has a cavity inner surface for forming two step walls B4, B5 facing forward and protrusions B6, B7 that protrude continuously in the circumferential direction of the skirt portion B1 on the step walls B4, B5. are doing.

l4 The secondary sealing cavity 16 has a cavity inner surface corresponding to a cavity corresponding to an elastic seal ring forming portion.

Primary molding A/Yabity 20 for each of the slide cores 17 and 17 combined with the primary molding cavity 15
, 20-{used as a pair t): 1 A passage B3 penetrating the skirt part B1 of the connector housing B in the radial direction thereof and a passage B3 surrounding the externally open LI part of the passage B3. It has a cavity inner surface for forming protrusions B8 and B8- that protrude.

A secondary molding cavity 21 of each of the slide cores 17 and 17 combined with the secondary molding cavity 16,
21' are also used as a pair, and one of the secondary molding cavities 21- is inserted into the skirt portion through the passage B3 at a position corresponding to the external opening of the two passages B3 of the connector housing B to be subjected to secondary molding. Cases 1 to 2 for injecting elastic materials C such as liquid silicone and elastomer 1.mer into
It has 2.

15 Therefore, in the manufacture of a connector housing, a pair of slide cores 1 are placed in the primary molding cavity 15 formed on the fixed mold 12 in the primary molding process, and are sandwiched therebetween and face each other.
7 and 17-, and by bringing the movable mold 11 close to this, the core cartridge 13', which is rotatably mounted on the movable mold 11, is arranged at a point symmetrical position with respect to its rotation axis. Then, a resin material is injected and penetrates in the radial direction on the skirt portion B1 of the housing body B using the inner surface of the cavity of the slide cores 17, 17-. A protrusion is formed on the periphery of the passage B3 and the external opening of the passage B3, and a protrusion protruding from the opening is formed, and the elasticity near the internal opening of the second passage is formed on the inner surface of the cavity of the fixed mold. Two step walls B4 and B5 facing forward of the skirt portion along the circumferential direction of the skirt portion on the boundary line of the seal ring forming portion, and a protrusion B6 that continues and projects in the circumferential direction of the skirt portion on the step wall. , B
7 (see Figures 6 and 7) 16 Next, after waiting for the resin material to solidify, the fixed mold 1 is first formed.
2 is moved back slightly, the slidable cores 17, 17- are moved back, and then the movable mold 11 is moved back while holding the housing body 13 in the cavity 14 on the core cartridge 13, and the rotation of the core cartridge 13 causes the housing body to The cavity 1.1 holding the mold 13 is opposed to the secondary molding cavity 16 having an inner surface corresponding to the leg seal ring forming portion of the fixed mold, and the cavity 14 is formed by approaching the movable mold to the fixed mold. is brought into contact with the secondary molding cavity 16 to crush the protrusions B6 and B7 of the step wall-L.

In the secondary molding, a pair of primary molding slight cores 18, 18'' of the fixed mold 121 facing each other with the secondary molding cap 16 in between are brought into contact with the housing body B,
The protrusion B8 on the periphery of the opening is crushed.

Thus, on the boundary line of the empty space corresponding to the elastic seal ring forming portion formed by the housing body F3, the secondary molding cavity 16, and the housing body B and the secondary molding slide cores 18, 18-. The gap is filled.

With the gap between the housing body B and each mold on the boundary line of the void space filled, the above-mentioned gas is passed from the gates 1 to 22 provided on the slide core 18- through the external opening of the skirt portion B1. Elastic material C is injected into the cavity. (See Figure 8) After waiting for the elastic material to harden, move the fixed mold 12 slightly backwards, and first move the sliding cores 18 and 18 back and move the moving metal 11 to the housing body B to the core cartridge. 13-L and move it backwards.

Then, the solidified elastic material C is cut off at the external opening of the skirt portion B1 while remaining in the passage B3, and a seal ring F is formed on the housing body B.

(See Figure 9) Next, after taking out the housing body (see Figure 9), the core cartridge is rotated again to return the cavity on the core cartridge to its initial position, and is used for the next molding.

At this time, the cavity 14- of the core cartridge 18-13 on the movable mold 11, the cavity 15 for primary molding on the surface of the fixed mold 12, and the pair of slide cores 17, l7- facing each other sandwiching the cavities 14-, The molded housing body rides on the core cartridge 13 on the mold 11 and moves to a position facing the secondary molding cavity 16.

7. Effect Because the primary molding and secondary molding are performed continuously in the mold, the protrusions formed on the boundary line of the elastic seal ring forming part of the housing are subjected to secondary molding before they are completely individualized. When it comes into contact with the mold, it is crushed in correspondence with the inner surface of the secondary mold, completely filling the gap between the parts.

In this state, when the elastic material is injected into the elastic seal ring forming part from the passage formed in the skirt part, even with its high fluidity, the housing body and the mold for secondary molding cannot be matched. No leakage and no buildup on the molded housing.

[Brief explanation of drawings]

1 to 5 show the first invention, and FIGS. 1(A) and 1(B) are views showing opposing surfaces of the movable mold and the fixed mold, respectively, with respect to the opposing mold; FIG. 2 is a cross-sectional view showing the primary molding step for molding the housing, and FIG. 3 is a cross-sectional view showing the secondary molding step for molding the elastic seal ring inside the skirt portion of the housing.
FIG. 4 is a sectional view of a housing manufactured through primary molding. Figures 5 to 9 show the first invention;
Figures (A) and (B) are views showing the facing surfaces of the movable mold and the fixed mold with the mating mold, and Figure 6 is Figure 1 (B) showing the primary molding step for molding the housing. ) of Y-
7 is a sectional view taken along line X-X in FIG. A cross-sectional view showing the state of the secondary molding step. FIG. 9 is a cross-sectional view of a housing manufactured through primary and secondary molding. A. Connector housing body, A1... Skirt 20 part, A2... Passage, A3... Projection, A4, A5...
・Step wall, A6, A7... Projection, C... Elastic material,
E... Seal ring, 1... Movable mold, 2... Fixed mold, 3... Core force -1, ridge, 4, 4-... Slide core, 5... Cavity, 6 , 6-... Cavity for primary molding, 7, 7... Cavity for secondary molding, 8... Gate, 9... Cavity for primary molding, 1o... Cavity for secondary molding, B...・Connector housing body, B1...skirt part, B3...passage, B4, B5...step wall, B6,
B7... Projection, D... Elastic material, E... Seal ring, 11... Movable mold, 12... Fixed mold, 13
... Core cartridge, 14, 14-... Cavity, 15... Primary molding cavity, 16,
16-...Cavity for secondary molding, 17, 1718
, 18... Slide core, 19... Cavity for secondary molding, 20, 201... Cavity for primary molding, 21, 21゛... Cavity for secondary molding, 22...
・From the gate -1. 21 Symbol Opening Hei 5 53913

Claims (2)

[Claims] (1) A method for manufacturing a waterproof connector housing, which consists of a primary molding step of molding the housing body and a secondary molding step of molding an elastic seal ring inside the skirt portion of the housing body, in which the movable connector housing is first molded in the primary molding. The core cartridge, which moves forward and backward on the mold, is stopped at the initial position, and a pair of slide cores located on both sides of the core cartridge trajectory are brought close to each other, combined with the core cartridge, and the mold is closed with a fixed mold, after which the resin material is removed. A passage is injected into the cavity of the slide core and passes through the skirt part of the housing body in the radial direction thereof, and a protrusion protrudes around the outer opening of the passage so as to surround the opening. At the same time, on the inner surface of the cavity of the fixed mold, on the boundary line of the elastic seal ring forming part near the internal opening of the second passage, two faces facing forward of the skirt part are formed along the radial direction of the skirt part. forming a step wall and a protrusion extending in the circumferential direction of the skirt portion on the step wall, waiting for the resin material to solidify, retracting the movable mold, and then retracting the slide core; Next, the core cartridge is moved from the initial position to the secondary molding position while holding the housing main body, and in the secondary molding, the slide core is repositioned against the core cartridge with the inner surface of the cavity different from the inner surface of the cavity. The fixed mold is combined and brought into contact with the protrusion, and the fixed mold is also assembled again with an inner surface of the cavity that has a cavity corresponding to the elastic seal ring forming part, which is different from the inner surface of the cavity, and brought into contact with the protrusion. The above-mentioned An elastic material is injected into the void from a gate provided in the slide core through the external opening of the skirt portion, and after waiting for the elastic material to solidify, the movable mold and the slide core are retreated and solidified. With the elastic material remaining in the passage, it is separated at the external opening of the skirt portion and a seal ring is formed on the housing body.
A method for manufacturing a waterproof connector housing, characterized in that after taking out the housing body, the core cartridge is returned to its initial position and used for the next molding. (2) A method for manufacturing a waterproof connector housing comprising a primary molding step of molding the housing body and a secondary molding step of molding an elastic seal ring inside the skirt portion of the housing body, the method being first fixed in the primary molding. A core cartridge is rotatably mounted on the movable mold by combining a pair of sliding cores facing each other with a primary molding cavity formed on the mold, and bringing the movable mold close to this. and one of the cavities arranged point-symmetrically with respect to the rotation axis of the slide core, and then a resin material is injected and the resin material is injected onto the inner surface of the cavity of the slide core and onto the skirt portion of the housing body. A passage penetrating in the radial direction and a protruding ridge protruding from the periphery of the external opening of the passage so as to surround the opening are formed, and the internal opening of the passage is formed on the inner surface of the cavity of the fixed mold. Two step walls facing forward of the skirt portion along the radial direction of the skirt portion on the boundary line of the elastic seal ring forming portion near the portion, and a protrusion extending continuously in the circumferential direction of the skirt portion on the step wall. As the resin material solidifies, the movable mold is first retracted slightly, the slid core is retracted, and then the movable mold is retracted while holding the housing body in the cavity above the core cartridge. The cavity holding the housing body is made to face the secondary molding cavity having an inner surface corresponding to the elastic seal ring forming portion of the fixed mold by rotation of The slide cores for secondary molding are brought into contact with the cavity for secondary molding, the protrusions on the step wall are crushed, and a pair of slide cores for secondary molding on fixed molds facing each other with the cavity for secondary molding interposed therebetween are combined therewith. A cavity corresponding to the elastic seal ring forming portion formed by closing the housing body and the cavity for secondary molding, and the housing body and the slide core for secondary molding, is fill the gap on the boundary line of the slide core, inject an elastic material into the void through the external opening of the skirt part from the gate provided in the slide core, wait for the elastic material to solidify, and then insert the slide core. Then, the movable mold is retreated, the solidified elastic material is left in the passage, and it is separated at the external opening of the skirt part, a seal ring is molded on the housing body, and after the housing body is taken out, the core cartridge is rotated again. A method for manufacturing a waterproof connector housing, characterized in that the cavity on the core cartridge is returned to its initial position by using the same method, and the cavity is used for the next molding.