JP2001293744A - Method for manufacturing insert molded part - Google Patents

Abstract

PROBLEM TO BE SOLVED: To remove a defect of conventional technique by preventing the deformation of a terminal caused by the injection pressure of a resin and a sink of a resin after molding, improving a processes for inserting a plurality of insert parts in a mold and enhancing the positional accuracy of the terminal in the mold, in manufacturing an insert molded article by insert molding. SOLUTION: A plurality of the insert parts 3 are integrated by a primary resin in a primary molding process and a plurality of the insert parts 3 integrated by the primary resin 6 are integrated by a secondary resin 10 in a secondary molding process to manufacture the insert molded article 1.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for producing mechanical parts and electric parts, for example, insert molded articles such as case plugs.

[0002]

2. Description of the Related Art In a conventional method of producing an insert molded product such as a case plug, a plurality of terminals are punched from a component material as a component for insert by pressing.
A plurality of terminals are integrally formed of resin by inserting the terminals into a molding die in a positioning state and injecting resin into the die.

[0003]

According to the above prior art, it takes a long time to insert a plurality of terminals into a molding die in a positioning state, and the production efficiency is deteriorated. Also,
During the resin injection process, the resin injection pressure is applied to the terminals in the molding die, causing the terminals to shift or deform,
Position accuracy between terminals is likely to be insufficient after molding. In addition, the resin volume (amount of injected resin) is large, and after molding, sink occurs in the resin, and the outer shape of the case plug is deformed and the outer dimensions are deviated. As described above, the positional accuracy of each terminal is not obtained, and the external dimensions of the molded product are likely to be out of order, thus causing a problem in product quality.

Accordingly, an object of the present invention is to prevent deformation of a terminal due to injection pressure of resin, prevention of sink of resin after molding, and use of a plurality of inserts in a molding die when manufacturing an insert molded product by insert molding. It is an object of the present invention to improve the process of inserting components and to improve the positional accuracy of terminals in a molding die to eliminate the drawbacks of the prior art.

[0005]

SUMMARY OF THE INVENTION In accordance with the above object, the present invention provides a method for forming a plurality of insert parts in a primary molding step.
After being integrated with the primary resin, a plurality of insert parts integrated with the primary resin are
Next, they are integrated with resin to produce insert molded products.

More specifically, according to the method for producing an insert molded product of the present invention, a plurality of insert components are punched out of a component material in a press working step.
The parts for multiple inserts punched in the next molding process
After being integrated with the primary resin in the next molding die, a plurality of insert parts are separated from the component material in the dividing step, and then the plurality of inserts integrated with the primary resin in the secondary molding step. Parts and other necessary insert parts are integrated with a secondary resin in a secondary molding die to produce an insert molded product.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 shows a sequence of steps of a method for producing an insert molded product according to the present invention, that is, a press working step.
1 shows a process of producing an insert molded product 1 such as a case plug through a primary molding process, a dividing process, and a secondary molding process. 2 to 6 show the state of each of the above steps.

FIG. 2 shows a state in which a plurality of insert parts 3 such as terminals are continuously manufactured from a strip-shaped part material 2 by punching or bending in a pressing process. Here, the plurality of insert parts 3 are, for example, three pieces, and are punched out in a state where they are connected by the connecting portion 4 of the part material 2 in a parallel state at equal intervals as a final installation posture.

Next, FIG. 3 is a view showing a state after the pressing step.
The following molding step is shown. Parts for three inserts 3
While being connected to the component material 2 by the connecting portion 4, it is inserted into the primary molding die 5 of the split mold, where it is integrated with the primary resin 6 injected therein, for example, at an intermediate portion. In this primary molding step, the primary resin 6 is injected from a gate in the same direction as the insert part 3 or a gate 11 in a direction perpendicular thereto. Incidentally, in the drawings, hatched portions indicate silver-plated regions to be implemented as needed. Here, the primary resin 6 is molded, for example, in the form of a block, and in order to position another insert component 7 to be incorporated as required, a positioning portion parallel to the direction of the insert component 3 at the center portion is used. Groove 8 is formed. In this way, the three parts 3 for the insert are separated from each other by the primary resin 6 at a predetermined interval.
To be integrated.

Next, FIG. 4 shows a dividing step.
In this dividing step, the three insert parts 3 are separated from each other by cutting the connecting part 4 and separated from the part material 2. The above-mentioned press working process and primary forming process are continuously performed by automatic feeding along a production line using the strip-shaped component material 2 as a carrier (conveyance guide).

Next, FIG. 5 shows a secondary molding step. In this secondary molding step, the plurality of insert parts 3 integrated with the primary resin 6 and other insert parts 7 combined as necessary are positioned inside the secondary molding die 9. It is inserted in a state, and is integrated by the secondary resin 10 injected into the secondary molding die 9. Here, the other insert part 7 is fitted into the positioning groove 8 in the positioning state, and is inserted together with the primary resin 6 and the insert part 3 into the secondary molding die 9. You. In the secondary molding step, the secondary resin 10 is injected from the upper or side gate 12.

FIG. 6 shows an insert molded product (case plug) 1 as a final product after molding. As is clear from this figure, the parts 3 for a plurality of inserts
The parts 3 and 7 for insert and the primary resin 6
Are similarly positioned and fixed inside the secondary resin 10. The secondary resin 10 constitutes a case (outer shape) of the insert molded product (case plug) 1 at the same time.
The parts 3, 7 for the insert have their heads partially exposed from the secondary resin 10, and their lower ends projecting into the depressions 13 formed by the secondary resin 10. The primary resin 6 forms the bottom of the depression 13.

FIG. 7 shows another example of the insert molded product (case plug) 1. In the example of FIG.
Covers only a central portion of the insert component 3 in a narrow range, but in FIG. 7, the primary resin 6 covers a wide range of the insert component 3.
This is advantageous in that when the secondary resin 10 is injected from the upper or side gate 12 in the secondary molding step, deformation of the insert component 3 due to resin pressure is reduced. Further, the amount of the secondary resin 10 in the secondary molding step is reduced, and the thickness thereof can be made substantially uniform along the contour.

[0014]

According to the present invention, the following effects can be obtained. In the process of primary molding, a plurality of insert parts are integrated with the primary resin, so that in the secondary molding step, the insertion of the plurality of insert parts into the secondary molding die becomes easy, and Since the time required for insertion is shortened, workability in the molding process is improved, and the production cost is also effectively reduced. In addition, since the plurality of insert parts are held in the positioning state in advance by the primary resin, the plurality of insert parts are not displaced by the injection pressure of the secondary resin during the injection of the secondary resin. Deformation is also minimized. A part of the insert molding is filled with the primary resin, and the amount of the secondary resin is reduced and uniformized with the primary resin. Production of molded articles becomes possible. Furthermore, since the plurality of insert parts are fixed in the primary molding step with the primary resin in a state of being connected, the mutual positioning accuracy of each insert part is high, and the insert molded article as the final product is formed. Quality is improved.

[Brief description of the drawings]

FIG. 1 is a process chart of a method for producing an insert molded product according to the present invention.

FIG. 2 is a plan view showing a state where a plurality of insert parts are punched out in a press working step of the method for producing an insert molded product according to the present invention.

FIG. 3 is an explanatory view of a primary molding step of the method for producing an insert molded article according to the present invention, wherein a is a side view and b is a plan view.

FIG. 4 is an explanatory view of a cutting step of the method for producing an insert molded product according to the present invention, in which a is a side view of an insert part integrated with a primary resin, and b is a front view thereof.

FIG. 5 is an explanatory view of a secondary molding step of the method for producing an insert molded article according to the present invention.

FIG. 6 is an explanatory view of an insert molded product as a final product, in which a and b are cross-sectional views and c is a bottom view.

FIG. 7 is a cross-sectional view of another example of an insert molded product.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 Insert molded product (case plug) 2 Component material 3 Insert component 4 Connecting part 5 Primary molding die 6 Primary resin 7 Insert component 8 Positioning groove 9 Secondary molding die 10 Secondary resin 11 Gate 12 Gate 13 Depression

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI theme coat ゛ (Reference) B29L 31:36 B29L 31:36 F term (Reference) 4F202 AD03 AD18 AD23 AD35 AG21 AH34 CA11 CB01 CB12 CB20 CB21 CK05 CK12 CK25 CK27 CK42 CK89 CQ03 CQ05 4F206 AD03 AD18 AD23 AD35 AG21 AH34 JA07 JB12 JB20 JB21 JF01 JF05 JF23 JL02 JM04 JM05 JN12 JN14 JN22 JN25 JN33 JQ54 JQ81

Claims (3)

[Claims] In a press working step, a plurality of insert parts are punched out of a part material in a connected state.
The parts for multiple inserts punched in the next molding process
After being integrated with the primary resin in the next molding die, a plurality of insert parts are separated from the component material in a dividing step, and then a plurality of inserts integrated with the primary resin in the secondary molding step. A method for producing an insert-molded article, comprising: manufacturing an insert-molded article by integrating the above components with a secondary resin in a secondary molding die. 2. In a press working step, a plurality of insert parts are punched from a part material in a connected state.
The parts for multiple inserts punched in the next molding process
After being integrated with the primary resin in the next molding die, a plurality of insert parts are separated from the component material in a dividing step, and then a plurality of inserts integrated with the primary resin in the secondary molding step. A method for producing an insert-molded article, comprising: manufacturing an insert-molded article by integrating a part with another necessary insert part with a secondary resin in a secondary molding die. 3. Inserting another insert part necessary for positioning into a positioning groove formed of the primary resin, and
3. The method for producing an insert molded product according to claim 2, wherein the insert molded product is inserted into a next molding die.