JPH03219934A - Positioning method for parts - Google Patents

Abstract

PURPOSE:To reduce a number of parts to be charged into a mold, by a method wherein after the first parts to which a connecting part is provided are positioned with fitting between the connecting part and a hole of the second parts and temporary assembly is performed, the connecting part is omitted by a positioning pin, the positioning pin is replaced with the connecting part and a plurality of parts of the temporary assembled body are molded and stuck. CONSTITUTION:An assembled body is formed of parts A, B, C by connecting respectively with one another. After the assembled body is inserted into a cavity 5b of a stationary side mold 5a and a pin 6 projected within the cavity 5b is fitted in a positioning hole 7 of the parts C, mold clamping is performed by approaching a movable side mold 5c to the stationary side mold 5a. In this instance, when approach of both the molds is advanced, a connecting part 2 is pressed downward, a joint with the parts B is broken and omitted into a lower air gap part. Since a positioning pin 4, which has kept pressing down the connecting part 2, has a conical tip, the connecting part 2 is replaced with the positioning pin 4 by entering into a hole of the parts A, into which the connecting part 2 of the part B has been fitted so far, while correcting a little deviation in a hole position, positioning of the parts A can be performed and the assembled body positioned highly accurately is obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a component positioning method in which a plurality of components are positioned using a molding die and simultaneously molded and fixed using a resin.

[Conventional technology]

As shown in FIG. 3, the conventional component positioning method of this type involves providing a positioning hole in each component, and inserting the individual components A and B into positioning pins 40 of a molding die provided correspondingly to the holes. After that, the molds were put together, resin was injected, and the mold was fixed in one piece.

[Problem to be solved by the invention]

The conventional component positioning method described above relies on the positioning pins of the ζ mold, and after each component is loaded into the mold, the molds are put together and resin is injected for integral molding. The drawback is that it takes time and effort because of the number of parts to be loaded.

[Means to solve the problem]

The component positioning method of the present invention is a component positioning method in which a component is integrally molded with other components using resin, in which a first component provided with a latching portion that falls off into a structurally unnecessary space due to an external force is latched. After the temporary assembly is performed by fitting the part and the hole of the second part, the temporary assembly is loaded into the fixed side cavity of the resin molding mold, the temporary assembly is positioned, and the temporary assembly is moved by clamping the mold. The latching part is dropped by a positioning pin provided in the cavity of the movable mold corresponding to the position of the latching part, and the positioning pin is replaced by the part that was positioned by the latching part, and the positioning pin is removed from the cavity. The method is characterized in that the plurality of parts of the temporary assembly are molded and fixed by injecting resin.

〔Example〕

Next, the present invention will be explained with reference to the drawings.

FIG. 1 is a longitudinal sectional view of an embodiment of the present invention.

The assembly consists of part B, which is hung on the outside of part C, which is the main body, and part A, which is a part of part B and placed on the opposite side of part C. Further, part B has a protruding hook part 2 that fits into a hole provided in part A, and parts A, B, and C are engaged with each other to form an assembly.

The structure of the mold for integrally molding this assembly with resin is that a cavity 5b is dug into the stationary mold 5a, and a protruding pin 6 is provided inside the cavity 5b, which serves as a positioning hole for the component C. Fit together.

On the other hand, as shown in FIG. 2, a cavity 5d into which a part of the above-mentioned assembly is inserted is bored in the movable mold, and a positioning pin 4 is provided in this cavity 5d. has a conical shape and corresponds to the hooking portion 2a of part B.

Next, the molding process of this assembly will be explained.

After inserting the aforementioned assembly into the cavity 5b of the stationary mold 5a and fitting the pin 6 protruding into the cavity 5b with the positioning hole 7 of the component C, the movable mold 5c is fixed. Close the mold by approaching the side mold 5a. At this time, before the two molds are completely brought together, the positioning pin 4 that protrudes into the cavity 5d dug into the movable mold 5c hits the protruding hook part 2 of the part B, and both As the mold approaches, the hooking part 2 is pushed downward and the connection part with the part B is broken and falls into the gap below.

In addition, since the positioning pin 4 that has pushed down the hooking part 2 has a conical tip, there is a slight deviation in the hole position of the hole in the component A that the hooking part 2 of the component B was previously fitted into. The part A can be positioned by entering the part while correcting it and replacing it with the hook part 2, and the mold clamping is completed.

After this, resin is injected into both cavities to complete the molding.

〔Effect of the invention〕

As explained above, since the present invention allows pre-assembly to be performed before integral molding with resin, it is possible to reduce the number of parts loaded into the molding die, reduce the molding process, and improve productivity. .

Moreover, since the position of the parts is determined by the positioning pins provided on the mold at the stage where the mold is clamped, it is possible to obtain an assembly that is positioned with high precision.

[Brief explanation of drawings]

Fig. 1 is a longitudinal cross-sectional view of an embodiment of the present invention, Fig. 2 is a longitudinal cross-sectional view showing a state in which the mold has been clamped in Fig. 1, and Fig. 3 is a longitudinal cross-sectional view showing a conventional part positioning method. It is a front view. A, B, C...parts, 1...hole, 2...hanging part,
4... Positioning pin, 5a... Fixed side mold, 5b,
5d... Cavity, 5C... Moving side mold.

Claims (1)

[Claims] In a component positioning method when a component is integrally molded with other components using resin, a first component provided with a latching portion that falls off into a structurally unnecessary space due to an external force is connected to the latching portion. After positioning by fitting into the hole of the second part and performing temporary assembly, the movable side is loaded into the fixed side cavity of the resin molding mold, the temporary assembly is positioned, and the movable side is moved by mold clamping. The latching part is removed by a positioning pin provided in the cavity of the mold corresponding to the position of the latching part, the positioning pin is replaced in the part that was positioned by the latching part, and the resin is placed in the cavity. A method for positioning parts, comprising molding and fixing a plurality of parts of the temporary assembly by injecting a plurality of parts.