JP3239308B2 - Manufacturing method for insert molded products - 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 an insert molded product, and more particularly to a method for manufacturing an insert molded product capable of securely fixing a connection terminal to a surface of a joint box or the like mounted on a vehicle.

[0002]

2. Description of the Related Art As shown in FIG. 2, a joint box 30 for use in a vehicle has housings 31 and 32 each having a substantially rectangular tube shape to which a connector (not shown) can be connected. Are arranged in such a manner that the axes intersect in a substantially L-shape. In such a joint box 30, housings 31, 32 are integrally formed by molding using an appropriate resin such as ABS, for example. The housing 32
A flat, substantially band-shaped fixing member 34 formed parallel to the opening 33 facing upward in the drawing has a plurality of connection terminals 35 arranged on the fixing member 34. Then, in an assembly process of incorporating a predetermined member into the joint box 30, another connection terminal (not shown) is brought into contact with each connection terminal 35, and each of the connection boxes 35 is subjected to wire bonding by applying ultrasonic vibration to the joint box 30. Another connection terminal is connected to the connection terminal 35.

As shown in FIG. 3, each connection terminal 35 is substantially L
It is provided by insert-molding the bus bar 40 having a character shape. The bus bar 40 is an embedded portion embedded in the fixing member 34.
41, and a connecting portion 42 connected to the end of the embedded portion 41 and along the surface of the fixing member 34. This bus bar 40
In molding the joint box 30,
The connection portion 42 is arranged in advance along the inner wall 51 of the mold 50 so that the molten resin is injected into the mold 50 to form the housing 32, so that the connection is crimped and fixed to the surface of the fixing member 34. The part 42 is used as the connection terminal 35.

[0004]

By the way, as shown in FIG. 4, the joint box 30 described above is connected to the connecting portion 42 where the surface of the fixing member 34 becomes the connecting terminal 35 due to shrinkage (heat shrinkage) after molding. There is a possibility that a gap 43 is formed between the fixing member 34 and the connecting portion 42 due to separation. In this case, even if wire bonding is performed on the joint box 30, since ultrasonic waves are not transmitted directly from the surface of the fixing member 34 to the connection portion 42, a connection failure occurs between the connection terminal 35 and other connection terminals. There was a problem.

SUMMARY OF THE INVENTION The present invention has been made to satisfy the above-mentioned demand, and an object of the present invention is to ensure that even if a fixing member is deformed by heat shrinkage after insert molding, a contact state of a connection terminal with a surface of the fixing member is ensured. An object of the present invention is to provide a method of manufacturing an insert molded product that can be maintained.

[0006]

An object of the present invention is to provide a method for manufacturing an insert-molded article, which comprises inserting a substantially L-shaped bus bar which is insert-molded to arrange connection terminals on a surface of a fixing member. A method for manufacturing an insert molded product having a buried portion in which the bus bar is buried in the fixing member, and a connecting portion connected to an end of the buried portion and along a surface of the fixing member. In response to the deformation of the fixing member due to shrinkage, the connection portion is excessively woven and bent in a direction approaching the embedded portion, and the molten resin is used to inject the connection portion in a direction away from the embedded portion in injection molding. Pressing against the inner wall of the mold while elastically deforming, the deformation due to heat shrinkage is fixed as above
When it occurs in the member, let the connection follow the deformation
Maintaining a contact state between the fixing member and the connecting portion.
That it can be solved by a manufacturing method of the insert-molded article according to claim.

In such a method of manufacturing an insert molded product, since the connecting portion is excessively bent toward the buried portion in response to the deformation of the fixing member,
When an insert molded product is formed by injection molding, elasticity is generated in the embedded portion so as to restore the relative angle to the connection portion to the initial state. For this reason, as in the conventional case, when the surface of the fixing member is deformed by heat shrinkage so as to separate from the connecting portion, the connecting portion elastically follows the surface of the fixing member. The parts will maintain mutual contact. Therefore, in the above-described method for manufacturing an insert molded product, it is possible to solve the problem that a gap is generated between the fixing member and the connection part forming the bus bar due to the heat shrinkage of the fixing member as in the related art.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment according to the present invention will be described below in detail with reference to FIG. In the embodiment described below, members and the like already described in FIGS. 2 and 3 are denoted by the same reference numerals or corresponding reference numerals in the drawings to simplify or omit the description.

As shown in FIG. 1, in the present embodiment, in order to arrange the connection terminals 35 along the surface of the fixing member 34,
The joint box 20 is manufactured by insert-molding the housing 32 using the substantially L-shaped bus bar 10. The bus bar 10 is, like a conventional bus bar,
A buried portion 11 buried in the fixing member 34, and a connecting portion 12 connected to the end of the buried portion 11 and along the surface of the fixing member 34.
And This busbar 10 is used to mold the joint box 20 before
A connection terminal 35 which is disposed at a predetermined position in the inside and is press-fixed and fixed to the surface of the fixing member 34 by injecting the molten resin 52 into the mold 50 to form the housing 32. It is. In the joint box 20 manufactured as described above, the surface of the fixing member 34 is deformed leftward and downward in the drawing due to shrinkage (thermal shrinkage) after molding.

In this embodiment, the bus bar 10
In response to the deformation of the fixing member 34 due to the heat shrinkage, the bending angle of the buried portion 11 and the connecting portion 12 is set to be an acute angle in advance, that is, the buried portion 11 and the connecting portion 12 are relatively close to each other. It is bent (see FIG. 1A). Next, in molding the joint box 20, the connecting portion 12 is orthogonal to the inner wall 51 of the mold 50, in other words, the embedded portion 11 intersects the inner wall 51 at a predetermined angle. Arrange the bus bar 10 and mold the molten resin 52 with a pressure that presses only the connection part 12 against the inner wall 51.
Inject into 50 (see FIG. 1 (B)).

The housing 32 in which the connection terminal 35 is insert-molded by the bus bar 10 has elasticity such that the bus bar 10 restores the included angle between the embedded portion 11 and the connection portion 12 to the initial state. Therefore, even if the surface of the fixing member 34 is deformed to the lower left in the drawing due to shrinkage (heat shrinkage) after molding, the connection portion 12 follows this deformation and maintains the contact state,
There is no fear that a gap is formed between the connecting portion 12 and the fixing member 34 unlike the related art.

According to the above embodiment, the housing
Even if shrinkage (thermal shrinkage) occurs after molding on the fixing member 34 of 32,
There is no gap between the connecting portion 12 and the fixing member 34, and even if wire bonding is performed on the joint box as in the related art, there is a disadvantage that a connection failure occurs between the connecting terminal 35 and another connecting terminal. Can be prevented. Note that the present invention is not limited to the above-described embodiment,
Modifications, improvements, and the like within a range in which the present invention can be achieved are included in the present invention. For example, the relative angle of the buried portion and the connecting portion constituting the bus bar, the pressure during injection molding, and the like can be appropriately selected.

[0013]

As described above, according to the method for manufacturing an insert molded product of the present invention, the connecting portion is excessively bent in a direction approaching the buried portion in advance in response to the deformation of the fixing member due to heat shrinkage. In addition, since the connection is elastically deformed toward the direction away from the buried part and is injection-molded so as to press against the inner wall of the mold, the connection follows the deformation of the fixing member and maintains the contact state. That is, since there is no gap between the fixing member and the connection portion, if wire bonding is performed on the insert molded product in order to connect another connection terminal to the connection terminal, ultrasonic waves can be transmitted reliably, and the connection terminal and other connection terminals can be connected. Connection terminal can be reliably connected.

[Brief description of the drawings]

FIG. 1 is a sectional view of a main part showing an embodiment according to the present invention.

FIG. 2 is a perspective view showing a joint box which is an insert molded product.

FIG. 3 is a fragmentary cross-sectional view showing a method for manufacturing a conventional insert molded product.

FIG. 4 is a fragmentary cross-sectional view showing a method for manufacturing a conventional insert molded product.

[Explanation of symbols]

 10 Busbar 11 Embedded part 12 Connection part 20 Joint box (insert molded product) 34 Fixing member 35 Connection terminal 50 Mold 51 Inner wall 52 Molten resin

Claims (1)

(57) [Claims] 1. A buried portion having a substantially L-shaped bus bar insert-molded for arranging connection terminals on a surface of a fixing member, wherein the bus bar is buried in the fixing member, and an end of the buried portion. And a connection portion along the surface of the fixing member, the connection portion being connected to the embedded member in advance in a direction approaching the embedded portion in response to deformation of the fixing member due to heat shrinkage. The connection portion is pressed and pressed against the inner wall of the mold while being elastically deformed by melted resin in a direction away from the buried portion during injection molding, and deformed by heat shrinkage.
Is generated in the fixing member, the connecting portion is deformed.
Following the contact state between the fixing member and the connecting portion
A method for producing an insert molded product, characterized by maintaining the following .