JP2860946B2 - Manufacturing method of waterproof connector housing - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION 1. Field of the Invention The present invention relates to an elastic member which is provided between a mating housing and a mating housing to maintain watertightness inside a skirt portion provided for fitting with the mating housing. The present invention relates to a method for forming a seal ring.

-2. Prior art A conventional manufacturing method of this kind is disclosed in Japanese Patent Application Laid-Open No. 63-221568.

In this manufacturing method, in order to form an elastic seal ring inside the skirt portion, firstly, in the primary molding, the male and female molds are closed from the axial direction of the housing in which the male and female molds are molded, and are incorporated in the female molds and are perpendicular to the above direction. A passage for introducing an elastic material to a seal ring forming portion formed inside the skirt portion is formed in the skirt portion with a slide mold that slides in the direction, and subsequently, the secondary mold is replaced with the mold in the above-described manner. Another male mold having a space corresponding to the elastic seal ring forming portion is closed with a mold, and an elastic material is injected from the retreated passage of the slide mold.

-3. Problems of the prior art In order to form an elastic seal ring by this method, it is necessary to form the seal ring with a material suitable for injection molding.

By the way, as a material suitable for injection molding, it is necessary to use an elastic material with high fluidity such as liquid silicon and thermoplastic elastomer, so a female mold holding the housing obtained by primary molding in secondary molding is required. The mold was closed with a male mold having a space corresponding to the seal ring forming portion, and the housing and the male mold were brought into contact with each other outside the boundary line except for the seal ring forming portion, as described above. When the above material is injected from the passage provided in the skirt, there is some variation in dimensional accuracy because the housing was obtained by molding, and the material may flow out from the joint between the housing and the male mold. There is.

−4. Means for Solving the Problems In view of the above-described drawbacks, the present invention first, in the primary molding,
A passage for holding a part of the elastic seal ring formed in the portion when the elastic material is cured, by providing the elastic material to flow from the outside of the skirt portion to the seal ring forming portion inside the skirt portion; A ridge is formed on the housing body so as to be continuous with the boundary line of the elastic seal ring forming portion and provided for contact with the secondary molding die, and the housing is subjected to secondary molding, and the movable metal holding the housing is formed. The mold cartridge is closed with a core cartridge on the mold, a fixed mold having a space corresponding to the seal ring forming part, and a pair of slide cores located on both sides of the core cartridge, and the housing, the slide core and the fixed mold are sealed with the seal ring forming part. Abutting on the boundary line except for the above, the ridge is crushed to fill the gap on the boundary line, and then the above-described passage provided in the skirt portion is used. The above-mentioned material is injected into the empty space, a seal ring is formed in the relevant portion, and the above-mentioned disadvantages are eliminated, and the primary molding and the secondary molding are continuously performed in one mold so that the ridge is formed. In order to be easily crushed, the housing body is subjected to secondary molding before it is completely cured.

-5. Action Since primary molding and secondary molding are performed continuously in one mold, the ridge formed on the boundary of the elastic seal ring forming part on the housing side is secondary before complete solidification. It is brought into contact with the molding die, crushed corresponding to the inner surface of the cavity of the secondary molding die, and completely fills the gap between the portions.

In this state, when the elastic material is injected into the elastic seal ring forming portion from the passage formed in the skirt portion, the elastic material can be injected from the joint between the housing body and the secondary molding die even with its high fluidity. Does not leak.

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

FIGS. 1A and 1B show a movable mold 1 and a fixed mold 2.
FIG. 6 is a diagram showing a surface facing each other's mold,
The movable mold 1 is a core cartridge 3 that moves forward and backward on the opposing surface, and slide cores 4 and 4 that move forward or backward on both sides of the track of the core cartridge 3 and are combined with the core cartridge 3 in a stationary state. '.

The core cartridge 3 is a connector housing body A
Has a cavity 5 corresponding to a part of.

The slide cores 4, 4 'have a pair of primary molding cavities 6, 6' and similarly a pair of secondary molding cavities 7, 7 ', and the primary molding cavities 6, 6' are connector housings. The skirt portion A1 of the main body A has a passage A2 penetrating in the radial direction thereof and a corresponding inner surface to form a protruding ridge A3 continuously projecting so as to surround the opening at a peripheral edge of an external opening of the passage A2. In FIG. 2, one of the cavities 7 and 7 'for secondary molding is located at the outer opening of the passage A2, and the passage A2 is located at the position where the ridge A3 is formed. There is a gate 8 for injecting an elastic material C such as liquid silicon or thermoplastic elastomer into the skirt portion A1 through the skirt portion A1.

The fixed mold 2 has a primary molding cavity 9 and a secondary molding cavity 10, and the primary molding cavity 9 has a skirt portion A1 on the boundary line of the elastic seal ring forming portion near the internal opening of the passage A2. The two step walls A4 and A5 whose surfaces face the opening direction of the skirt portion A1 (the direction in which the fixed mold 2 is removed) along the circumferential direction of the skirt portion A1 and project in the circumferential direction of the skirt portion A1 on the step walls. In order to form the ridges A6 and A7 (in FIG. 2, the positions where the ridges A6 and A7 are formed are denoted by reference numerals), the cavities 10 for secondary molding have It has an inner surface corresponding to a void corresponding to the elastic seal ring forming portion.

Therefore, in manufacturing the waterproof connector, first, the core cartridge 3 is stopped at the initial position, combined with the slide cores 4 and 4 'located on both sides, the mold is closed with the fixed mold 2, and the resin material is injected. I do.

A passage A penetrating radially through the skirt portion A1 of the connector housing main body A on the inner surface of each cavity.
2, a ridge A3 continuously projecting so as to surround the opening at the periphery of the external opening of the passage A2, along the radial direction of the skirt on the boundary line of the elastic seal ring forming portion near the internal opening of the passage A2. Two step walls A4, A5 facing the front of the skirt portion and ridges A6, A7 projecting in the circumferential direction of the skirt portion on the step walls are formed.
(Refer to FIG. 2) Then, after the resin material is solidified, first, the movable mold 1
Then, the slide cores 4 and 4 'are retracted and the core cartridge 3 is moved from the primary molding cavities 6 and 6' to the slide cores 4 and 4 'while holding the housing body A.
Of the secondary molding cavities 7, 7 '.

In the secondary molding, the slide cores 4 and 4 'are combined with the core cartridge 3 again, and the inner surfaces of the cavities 7, 7' for secondary molding are brought into contact with the ridges A3 of the skirt portion A1 and crushed.

Also, the stationary mold B is combined with the secondary molding cavities 7, 7 'having a cavity corresponding to the elastic seal ring forming portion, and is brought into contact with the ridges A6, A7. Crush.

Thus, a cavity 10 for the secondary molding of the housing body A and the movable mold 2 and a boundary line of the cavity corresponding to the elastic seal ring forming portion constituted by the housing body A and the slide cores 4 and 4 'are closed. The gap is filled.

With the gaps between the housing body A and the molds on the boundary between the cavities filled in, the gates 8 provided on the slide cores 4 and 4 'are passed through the passages A2 of the skirt A1 to form the cavities. Inject elastic material into (See FIG. 3) Waiting for the elastic material to solidify, the movable mold 1 and the slide cores 4, 4 'are retracted, and the external opening of the skirt portion A1 is kept in a state where the solidified elastic material C remains in the passage A2. Then, a seal ring E is formed in the skirt portion A1 of the housing body A. (See FIG. 4.) After removing the housing body A, the core cartridge 3 is returned to the initial position again, and is used for the next molding.

5 to 9 illustrate an example of the second invention.

FIGS. 5A and 5B show a movable mold 11 and a fixed mold 12.
FIG. 3 is a view showing a surface facing each other's mold, and a core cartridge 13 is rotatably mounted on the movable mold 11 on the surface.

Molding cavities 14 and 14 'corresponding to a part of the connector housing B are formed in the core cartridge 13 at positions symmetrical with respect to the rotation axis.

On the surface of the fixed mold 12, a primary molding cavity 15 and a secondary molding cavity 16, and a pair of slide cores 17, 17 'and 18, 1 facing each other with the cavities 15, 16 interposed therebetween.
8 'is provided.

The primary molding cavity 15 passes through the skirt portion B1 of the connector housing B in the radial direction.
Two step walls B4 whose surfaces face the opening direction of the skirt portion B1 (the direction in which the fixed mold 12 is removed) 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 B3, B5 and the skirt on the step walls B4 and B5
It has a cavity inner surface for forming ridges B6 and B7 projecting continuously in the circumferential direction of B1. In FIGS. 6 and 7, portions where the step walls B4 and B5 and the ridges B6 and B7 are formed are denoted by reference numerals.

The secondary molding cavity 16 has a cavity inner surface corresponding to a space corresponding to the elastic seal ring forming portion.

The slide cores 17, 17 'respectively combined with the primary molding cavities 15, the primary molding cavities 20, 20' are used as a pair, and a passage B3 and a passage penetrating through the skirt portion B1 of the connector housing B in the radial direction thereof. At the peripheral edge of the external opening of B3, there is a cavity inner surface for forming ridges B8 and B8 'projecting continuously so as to surround it.

The slide cores 17 and 17 'respectively combined with the secondary molding cavities 16 and the secondary molding cavities 21 and 21' are also used as a pair, and one of the secondary molding cavities 21 'is a connector used for secondary molding. A gate 22 for injecting an elastic material C such as liquid silicon or thermally degradable elastomer into the skirt portion via the passage B3 is provided at a position corresponding to the external opening of the passage B3 of the housing B.

Therefore, in the manufacture of the connector housing, in the primary molding, a pair of slide cores 17 sandwiching and facing the primary molding cavity 15 formed on the fixed mold 12.
17 ′, and the movable mold 11 is brought close to the core cartridge 17 ′, so that the core cartridge 13 rotatably mounted on the movable mold 11 is disposed at a point-symmetric position with respect to its rotation axis. Combine with one of the cavities 14, 14 ', and then inject resin material to slide cores 17, 17'
A passage B3 penetrating in the radial direction on the skirt portion B1 of the housing body B on the inner surface of the cavity and a ridge projecting continuously around the periphery of the external opening of the passage so as to surround the opening. In addition, two step walls B4 facing the front of the skirt portion along the circumferential direction of the skirt portion on the boundary line of the elastic seal ring forming portion near the internal opening of the passage with the inner surface of the cavity of the fixed mold. , B5
And protruding ridges B6 and B7 projecting in the circumferential direction of the skirt portion on the step wall (see FIGS. 6 and 7). Then, after the resin material is solidified, first, the fixed mold is formed.
12 is retracted slightly, the sliding cores 17 and 17 'are retracted, and then the movable mold 11 is retracted while holding the housing body B in the cavity 14 on the core cartridge 13, and the housing body B is rotated by rotation of the core cartridge 13. With the inner surface corresponding to the elastic seal ring forming part of the fixed mold.
The cavities 14 are brought into contact with the cavities 16 for secondary molding by approaching the movable dies to the fixed dies, and the protrusions B6 and B7 on the step walls are crushed.

In the secondary molding, a pair of secondary molding slide cores 18 and 18 'on the stationary mold 12 opposed to each other with the secondary molding cavity 16 interposed therebetween is brought into contact with the housing body B, and the protrusions on the periphery of the opening are formed. Crush B8.

Thus, the gap on the boundary line of the cavity corresponding to the elastic seal ring forming portion formed by closing the housing body B and the secondary molding cavity 16 and the housing body B and the secondary molding slide cores 18 and 18 'is formed. Buried.

With the gap between the housing body B and each mold on the boundary line of the space filled, the gate 22 provided on the slide core 18 'is connected to the space via the external opening of the skirt B1. The elastic material C is injected. (See FIG. 8.) Waiting for the elastic material to solidify, the fixed mold 12 is slightly retracted, the slide cores 18 and 18 'are first retracted, and then the movable mold 11 is moved onto the core cartridge 13 with the housing body B. Retract while holding.

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 E is formed on the housing body B. (See FIG. 9) Subsequently, after taking out the housing body (see FIG. 9), the core cartridge is rotated again to return the cavities on the core cartridge to the initial position, and subjected to the next molding.

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

-7.Effect Since the primary molding and secondary molding are performed continuously in one mold, the ridge formed on the boundary of the elastic seal ring forming part on the housing side is secondary before it is completely solidified. It is brought into contact with the molding die, crushed corresponding to the inner surface of the cavity of the secondary molding die, and completely fills the gap between the portions.

In this state, when the elastic material is injected into the elastic seal ring forming portion from the passage formed in the skirt portion, the elastic material can be injected from the joint between the housing body and the secondary molding die even with its high fluidity. No spills and no burrs on the molded housing.

[Brief description of the drawings]

1 to 5 show the first invention, and FIG.
FIGS. 2A and 2B are diagrams showing opposing surfaces of a movable mold and a fixed mold, respectively, with a counterpart mold. FIG. 2 is a sectional view showing a primary molding step for molding a housing. FIG. 4 is a sectional view showing a state of a secondary molding step for molding an elastic seal ring in a skirt portion of the housing. FIG. 4 is a sectional view of a housing manufactured through primary and secondary molding. FIGS. 5 to 9 show the first invention, and FIG.
Figures (A) and (B) are diagrams showing opposing surfaces of a movable mold and a fixed mold, respectively, with a counterpart mold. FIG. 6 is a primary molding step for molding a housing, and is a fixed mold. FIG. 5B is a view of the state in which the movable mold is closed and the slide core is assembled in the sectional view taken along the line Y-Y of FIG. 5B, FIG. FIG. 9 is a sectional view showing a state of a step of secondary molding for molding an elastic seal ring in a skirt portion of the housing. FIG. 9 is a sectional view of a housing manufactured through primary and secondary molding. A: Connector housing body, A1: Skirt, A2
…… Aisle, A3 …… Protrusion, A4, A5 …… Stepped wall, A6, A7 ……
Projection, C: elastic material, E: seal ring, 1 ... movable mold, 2 ... fixed mold, 3 ... core cartridge,
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, 10 ... cavity for secondary molding, B ... connector housing body, B1 ... Skirt, B3
... passage, B4, B5 ... stepped wall, B6, B7 ... ridge, D ...
Elastic material, E ... Seal ring, 11 ... Movable mold, 12 ...
… Fixed mold, 13… Cover cartridge, 14, 14 ′… Cavity, 15 …… Cavity for primary molding, 16, 16 ′
…… Cavity for secondary molding, 17, 17′18, 18 ′ …… Slide core, 19 …… Cavity for secondary molding, 20, 20 ′
…… Cavity for primary molding, 21, 21 ′ …… Cavity for secondary molding, 22 …… Gate

Claims (2)

(57) [Claims] 1. A method for manufacturing a waterproof connector housing, comprising: a primary molding step of molding a housing body; and a secondary molding step of molding an elastic seal ring inside a skirt portion of the housing body. After the core cartridge that moves forward and backward on the movable mold is stopped at the initial position, a pair of slide cores located on both sides of the track of the core cartridge are brought close to each other, combined with the core cartridge and closed with a fixed mold, and then the resin is removed. A passage for injecting a material, penetrating in the radial direction on the skirt portion of the housing body with the inner surface of the cavity of the slide core, and a ridge protruding continuously around a periphery of an external opening of the passage so as to surround the opening. And the inner surface of the cavity of the fixed mold is used to form a bullet near the internal opening of the passage. Forming two step walls facing the opening direction of the skirt section along the circumferential direction of the skirt section on the boundary line of the seal ring forming section, and projecting ridges projecting continuously in the circumferential direction of the skirt section on the step wall. Waiting for the resin material to solidify, retracting the movable mold, retracting the slide core, and then moving the core cartridge from the initial position to the secondary molding position while holding the housing body, In the secondary molding, the slide core is recombined with the core cartridge with a cavity inner surface different from the cavity inner surface to abut on the ridge of the opening, and the fixed mold is also separated from the cavity inner surface. The inner surface of the cavity having a space corresponding to the elastic seal ring forming portion is reassembled and brought into contact with the ridge on the step wall. Crushed Luo ridge,
Fill the gap on the boundary line of the cavity corresponding to the cavity of the housing main body and the fixed mold and the space corresponding to the elastic seal ring forming portion configured to be closed by the housing main body and the slide core. An elastic material is injected into the space through the external opening of the part, and after the elastic material is solidified, the movable mold and the slide core are retracted, and the skirt is left in a state where the solidified elastic material remains in the passage. The seal ring is formed on the housing body by separating at the external opening of the part, and after removing the housing body, the core cartridge is returned to the initial position again, so that it can be used for the next molding. Manufacturing method of connector housing. 2. A method of manufacturing a waterproof connector housing, comprising: a primary molding step of molding a housing main body; and a secondary molding step of molding an elastic seal ring inside a skirt portion of the housing main body. A core cartridge that is rotatably mounted on a movable mold by combining a primary molding cavity formed on a fixed mold with a pair of slide cores that face each other and sandwiching the slide core. Combined with one of the cavities arranged point-symmetrically with respect to its rotation axis above, and then injecting a resin material to form the cavities on the inner surface of the slide core and on the skirt of the housing body. A passage that penetrates in the radial direction and a ridge that protrudes continuously around the periphery of the external opening of the passage so as to surround the opening; And the inner surface of the cavity of the fixed mold, with the surface facing the opening direction 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 internal opening of the passage. A step wall and a ridge projecting in the circumferential direction of the skirt portion are formed on the step wall, and the movable mold is first retracted slightly with the solidification of the resin material, and then the slide core is retracted. With the housing body held in the cavity on the core cartridge, the housing is retracted, and the cavity holding the housing body is rotated by rotation of the core cartridge into a cavity for secondary molding having an inner surface corresponding to the elastic seal ring forming portion of the fixed mold. Confront, the movable mold comes close to the fixed mold, and the cavities come into contact with the cavities for secondary molding. The ridges on the stepped wall are crushed, and a pair of secondary molding slide cores on the fixed mold that face each other with the secondary molding cavities sandwiched therebetween are brought into contact with each other so as to combine with them. Crush,
Filling the gap on the boundary line of the cavity corresponding to the elastic seal ring forming portion configured by closing the housing body and the secondary molding cavity and the housing body and the secondary molding slide core, and providing the sliding core. Inject the elastic material from the gate into the cavity through the external opening of the skirt, wait for the elastic material to solidify,
The slide core and the movable mold are retracted, and the solidified elastic material is cut off at the external opening of the skirt portion while remaining in the passage, a seal ring is formed on the housing body, and after taking out the housing body, the core cartridge is again removed. A method for manufacturing a waterproof connector housing, characterized in that a cavity on a core cartridge is rotated to return to an initial position, and is used for the next molding.