JP4330873B2 - Manufacturing method of housing with waterproof seal and mold for manufacturing the same - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a method for manufacturing a housing with a waterproof seal having a waterproof seal portion therein, and a mold for manufacturing the same.
[0002]
[Prior art]
In a waterproof connector for automobiles and the like in which a male housing and a female housing are fitted to each other and electrical connection terminals provided in these housings are coupled to each other, a waterproof seal portion is usually provided inside the female housing. A male housing is provided for watertight fitting.
[0003]
As shown in Japanese Patent Publication No. 5-23030, Japanese Patent Application Laid-Open No. 11-144793, and Japanese Patent Application Laid-Open No. 11-144831, the waterproof seal portion in the housing with the seal part is simplified. In order to reduce the manufacturing cost, it is also known that molding is performed in the same mold together with molding of the housing by molding different materials.
[0004]
In the case of Japanese Patent Publication No. 5-23030, after forming a housing with a cavity and a core for molding a housing, the core is replaced with a mold for molding a member. The seal portion is integrally attached to the housing by filling a rubber material into the seal portion molding space between the portions.
[0005]
In the case of Japanese Patent Laid-Open Nos. 11-144793 and 11-144831, the housing molding cavity and core are composed of an inner core and an outer core that are individually advanced and retracted, and further to the outside thereof. In the former, a slide mold for assisting molding of the seal portion is provided, and in the latter, a fixed mold for supplementing the cavity is provided. After molding the housing with the cavity and inner core and outer core or these molds and fixed mold, the outer core is retracted appropriately, the former is clamped with the slide mold, and the latter is fixed with the fixed mold as it is In use, the seal portion is integrally attached to the housing by filling a rubber material into the seal portion molding space between these molds and a part of the already formed housing.
[0006]
[Problems to be solved by the invention]
However, the filling of the rubber material into the sealing part molding space is in an insufficient distribution state in the sealing part molding space, the seal part is partially or locally defective, and sufficient water tightness cannot be secured. There is.
[0007]
Furthermore, in the case of Japanese Patent Publication No. 5-23030, it is sufficient that the mold and the mechanical equipment are relatively simple, but there is a possibility that the seal part is pulled out when the seal part molding die is removed. is there. In the case of Japanese Patent Application Laid-Open No. 11-144793 and Japanese Patent Application Laid-Open No. 11-144831, the mold is formed by pulling out the other one in advance while holding the molded seal part in one of the inner core and the outer core. Although it is possible to prevent the seal portion from being pulled out at the time of extraction, the mold, equipment, and control means thereof become complicated, resulting in high costs.
[0008]
An object of the present invention is to provide a method of manufacturing a housing with a waterproof seal and a mold for manufacturing the same, which can solve the above-mentioned problems and can easily attach a seal portion having an appropriate shape without a defect to the housing. It is in.
[0009]
[Means for Solving the Problems]
In order to achieve the above object, a method for manufacturing a housing with a waterproof seal according to the present invention includes: one synthetic resin housing body of an electrical connector is injection-molded with a housing molding die, and one of the housings is sealed with a sealing portion molding die. In a method for manufacturing a waterproof seal housing in which a seal portion made of a rubber material is integrally attached to a portion, the seal portion molding die is provided with an inlet and a flow of the rubber material with respect to a seal portion molding space forming the seal portion. An outlet is provided, and a part of the outlet is closed by a part of the housing main body or a part of the seal part molding die, and the cross- sectional area is made smaller than the cross-sectional area of the inlet, and the outlet flows out of the outlet. together provide flow resistance to the rubber material for, and the inflow path and the outflow path of the rubber material is provided communicates with said inlet and said outlet to said housing body, It said inlet path serial rubber material, through the inlet was charged into the seal portion molding space, overflowing the rubber material, characterized in that to flow out into a series to the outflow passage through the outlet.
[0010]
In addition, the mold for manufacturing a housing with a waterproof seal according to the present invention is an inflow of a rubber material to a rear portion on the opposite side to a front portion of one of the housing main bodies of the electrical connector that is injection-molded with a synthetic resin material. Forming a passage and an outflow passage, opening at the front ends of the inflow passage and the outflow passage, providing an inlet and an outlet for the rubber material with respect to the housing mold, and attaching to a part of the housing body The seal part is composed of a seal part mold for injection molding with the rubber material, and the housing mold is composed of a cavity for molding the rear part of the housing body and a core for forming the front part of the housing body. The seal part molding die is composed of a seal part molding rear mold and a seal part molding front mold used in exchange for the cavity and the core, and the seal part molding A rubber mold filling runner that communicates with the inflow path and an air bend that communicates with the outflow path are provided in the rear mold for use, and the front mold for sealing part molding communicates with the inlet and the outlet. Forming a seal part forming space, and closing a part of the outlet with a part of the housing body or a part of the seal part molding die to make the cross-sectional area smaller than the cross-sectional area of the inlet. Features.
[0011]
DETAILED DESCRIPTION OF THE INVENTION
The present invention will be described in detail based on the illustrated embodiment.
FIG. 1 is a longitudinal sectional view of a completed sealed housing. A housing main body 1 of a female housing that is injection-molded with a synthetic resin material is provided with a hood portion 2 that opens forward, and is provided inside the hood portion 2. Further, a waterproof seal portion 4 is attached to the periphery of the base portion of the shaft-shaped portion 3 protruding forward by injection molding a rubber material.
[0012]
In the rear part 5 of the housing body 1, a flow path composed of an inflow path 6 and an outflow path 7 of rubber material is formed in a pipe shape in the front-rear direction, and at the front ends of the inflow path 6 and the outflow path 7, An inflow port 8 and an outflow port 9 made of rubber material are provided. The inflow port 8 and the outflow port 9 are arranged in a position farthest in the seal portion molding space, and the inflow path 6 is formed to have a larger flow cross-sectional area than the inflow port 8.
[0013]
Further, in order to adhere the seal portion 4 to the outer periphery of the base portion of the shaft-like portion 3 in the hood portion 2, the material rubber material is an inflow path 6, an inflow port 8, a seal portion molding space, an outflow port 9, and an outflow path 7. It flows in the order. And the stopper 10 made to protrude from the housing main body 1 is provided in a part of outflow port 9, and the cross-sectional area of the outflow port 9 is made small. Alternatively, this cross-sectional area may be reduced by closing a part of the outlet 9 with a seal part molding die described later.
[0014]
In manufacturing, first, as shown in FIG. 2, the housing body 1 is injection-molded with a synthetic resin material by a housing molding die 13, and the outer periphery of the hood portion that molds the outer peripheral portion of the hood portion 2 with the housing molding die 13. It comprises a mold 14 for part molding, a cavity 15 for molding the rear part 5 of the housing body 1, and a core 16 for forming the inner peripheral part of the hood part 2 and the shaft-like part 3. 15. The housing body 1 is molded by clamping the core 16 and injecting a synthetic resin material into the white portions shown in FIG.
[0015]
Needless to say, the outer peripheral portion molding die 14, the cavity 15 and the core 16 are housed in the above-described form and the necessary electrical connection terminal shown in FIG. Appropriate uneven shapes for forming the portion 17 and the lead wire insertion portion 18 are formed. Of course, appropriate means such as runners and air bends are also taken, but these may be known means.
[0016]
Subsequently, as shown in FIG. 3, the cavity 15 and the core 16 are pulled out with the hood part outer peripheral part molding die 14 left, and a seal part molding which is a seal part molding die as shown in FIG. The rear mold 20 is replaced with a seal mold front mold 21.
[0017]
The rear mold 20 for sealing part molding includes a runner 23 for filling a rubber material so that a gate 22 at the front end faces the rear end of the inflow path 6 of the rubber material in the rear part 5 of the housing body 1, and An air bend 25 is provided in which the minute vent 24 faces the rear end of the rubber material outflow passage 7 in the rear portion 5. Further, the seal part molding front mold 21 is provided with a seal part molding space 26 communicating with the inlet 8 and the outlet 9 provided at the front ends of the inlet 6 and outlet 7.
[0018]
And a sealing portion for molding the rear die 20 and the sealing portion molding anterior mold 21 and mold clamping, the injection portion of the rubber material is evacuated, in a state where the housing main body 1 is not sufficiently cooled, the runner 23 By injecting the rubber material into the inflow path 6, the rubber material is filled into the seal portion forming space 26 from the inflow path 6 through the inflow port 8. Then, the rubber material overflowing from the seal portion forming space 26 flows out to the outflow passage 7 through the outflow port 9. After the rubber material is solidified, the molds 14, 20, and 21 are opened, and the finished product shown in FIG. 1 is taken out.
[0019]
In this case, the cavity 15 and the core 16 of the housing mold 13 are replaced with a seal part molding rear mold 20 and a seal part molding front mold 21 of the seal part mold, and cooling immediately after molding. Since the seal portion 4 is attached to the housing body 1 which is not fully cut, the fluidity of the rubber material to be filled is not lowered so much, the fluidity is maintained, and the adhesion of the rubber material to the housing body 1 is also increased. .
[0020]
The inlet 8 and the outlet 9 at the front ends of the inflow path 6 and the outflow path 7 are arranged in the farthest positional relationship in the seal portion molding space 26 of the seal portion molding front mold 21. Since only the outflow port 9 has a small cross-sectional area formed by the stopper 10 and increases the flow resistance of the rubber material, it is possible to improve the balance between the flowability and retention of the rubber material filled in the seal portion molding space 26, and the seal In the partial molding space 26, the rubber member can be sufficiently filled without generating a nest or a gap in the rubber material, and a partial or local defect is not generated in the formed seal portion 4.
[0021]
Further, since the rubber material filled in the inflow path 6 and the outflow path 7 is integrally connected to the seal portion 4 of the same rubber material attached to the housing body, the solidified rubber material in the inflow path 6 and the outflow path 7 However, the adhesive force of the seal part 4 is mechanically increased, and the seal part 4 is opened even when the seal part molding dies 20 and 21 are opened, especially when the seal part molding front mold 21 is pulled out. It will never be pulled out.
[0022]
【The invention's effect】
As described above, according to the method for manufacturing a housing with a waterproof seal and the mold for manufacturing the waterproof seal according to the present invention, when the rubber material is filled into the seal portion molding space in the seal portion molding die, By reducing the size, the rubber material can be fully and adequately filled in the entire molding space of the seal part, and there is no partial or local defect in the adhered seal part, and the water tightness of the seal part Can be secured sufficiently.
[Brief description of the drawings]
FIG. 1 is an enlarged cross-sectional view of a housing with a seal portion after molding according to an embodiment.
FIG. 2 is a cross-sectional view of a housing molding die for a female housing.
FIG. 3 is a cross-sectional perspective view of a female mold and a mold for forming the outer periphery of a hood.
FIG. 4 is a cross-sectional view of a sealing part molding die in a clamped state.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Housing main body 2 Hood part 3 Shaft-shaped part 4 Seal part 6 Inflow path 7 Outflow path 8 Inlet 9 Outlet 10 Stopper 13 Housing shaping | molding die 14 Hood part outer periphery shaping | molding die 15 Cavity 16 Core 20 For sealing part shaping | molding Rear mold 21 Seal mold front mold 26 Seal molding space

Claims (3)

  Manufacturing of a waterproof sealed housing in which one synthetic resin housing body of an electrical connector is injection-molded by a housing molding die, and a seal portion made of a rubber material is integrally attached to a part of the housing by a sealing portion molding die In the method, the seal part molding die is provided with an inlet and an outlet for the rubber material with respect to a seal part forming space forming the seal part, and a part of the outlet is a part of the housing body or the seal. The cross-sectional area is closed by a part of the part molding die to make the cross-sectional area smaller than the cross-sectional area of the inflow port, and the rubber material flowing out from the outflow port is given a flow resistance. An inflow path and an outflow path for the rubber material are provided in communication with an outflow port, and the rubber material is filled into the seal portion molding space through the inflow path and the inflow port, Method for manufacturing a waterproof seal with the housing for causing to flow out the rubber material which is in series to the outflow passage through the outlet.   The housing with a waterproof seal according to claim 1, wherein the seal portion is attached to the inside of the housing by exchanging another mold portion with the seal portion molding die while leaving a part of the housing mold. Manufacturing method. An inflow path and an outflow path through which rubber material flows are formed at the rear of the electrical connector that is injection-molded with the synthetic resin material on the opposite side of the front of the housing body that is in contact with the other housing. From the seal part molding die which is opened at the front end and is provided with an inlet and an outlet for the rubber material with respect to the housing molding die, and a waterproof seal part adhering to a part of the housing body is injection molded with the rubber material The housing molding die is composed of a cavity that molds the rear portion of the housing body and a core that forms the front portion of the housing body, and the seal portion molding die is replaced with the cavity and the core. A seal part molding rear mold and a seal part molding front mold, and the seal part molding rear mold has a rubber material filling runner communicating with the inflow path. Provided Eabendo communicating with the outflow path, wherein the sealing portion the front mold for molding to form the seal portion molding space leading to said inlet and outlet, a portion of said outlet of said housing body A mold for manufacturing a housing with a waterproof seal, wherein the mold is closed by a part or a part of the molding die for sealing part and the cross-sectional area thereof is smaller than the cross-sectional area of the inlet.

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