JPH0249620B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for the continuous production of plastic insert molded parts, in particular for the assembly and supply of wristwatches.

Conventionally, this type of continuous manufacturing method involves press-working a metal ribbon material to form the external shape and bending shape of the component, as well as a bridge portion that connects the component and the ribbon material, and then using an injection molding machine. This is a method of inserting plastic into a predetermined location, and in assembly supply, the bridge section that connects the parts and ribbon material is separated into individual parts via a separation mold and supplied to the assembly machine just before the assembly section. Ta.

However, in the conventional method, since the metal bridge portion is cut, mold wear is large and the mold must be replaced frequently. Therefore, this had a significant impact on the operating efficiency of the assembly machine, and due to the design of the parts, a cutting allowance was also required to cut the metal bridge, making it difficult for wristwatches aimed at miniaturization. , it was a disadvantage.

The present invention eliminates these drawbacks and makes the feeding of plastic insert molded parts to assembly machines both rational and inexpensive.

Next, the method for manufacturing a plastic insert molded part of the present invention will be explained with reference to the drawings.

[Step 1] As shown in FIGS. 1a and 1b, a hole in which the pilot hole 1, component 2, and bridge 3 remain, and a plastic fixing hole 4 are formed from the ribbon material 10 by means such as a progressive press.

[Step 2] As shown in FIGS. 2a and 2b, the boundary 5 between the component 2 and the bridge portion 3 is half-blanked. (Fig. 6a shows an enlarged view of the half-blanked cross section.) [Step 3] As shown in Figs. 3a and b, in the injection mold, return the boundary 5 that was half-blanked in the step 2,
(An enlarged view is shown in FIG. 6b.) The metal bridge 3 is separated.

[Step 4] As shown in FIGS. 4a and 4b, plastic is inserted to form a predetermined part shape 6, and a plastic bridge 7 for connecting the part 2 and the ribbon material 10.
and molding.

The parts manufactured continuously by the above method are
As shown in Figure 5 a and b, just before the assembly machine,
The plastic bridge 7 is separated and fed to an assembly machine.

Therefore, according to the present invention, since the separation is carried out in the plastic part, there is little wear on the mold, and there is almost no need to replace the mold, so it is possible to increase the operating rate of the assembly machine, and the cutting load is also small. Therefore, there is less vibration during supply, and it is possible to reliably supply the product to the assembly machine. In addition, the metal bridge part can be separated by simply returning it in the injection mold, so no cutting allowance is required.
This is advantageous in terms of component design, and can also reduce exposure of metal parts.

[Brief explanation of drawings]

1 to 4 are diagrams for explaining the manufacturing method of the present invention, in which a shows a cross-sectional view and b shows a plan view, respectively. FIGS. 5a and 5b are an isolated cross-sectional view and a plan view of a component manufactured by the manufacturing method of the present invention, and FIGS. 6a and 6b are enlarged cross-sectional views showing the partially punched and returned state. 1...Pilot hole, 2...Parts (as press-molded), 3...Bridge, 4...Plastic fixing hole,
5... Half punched part, 6... Part after insert molding, 7...
Plastic bridge.

Claims (1)

[Claims] 1. A step of continuously press-cutting a component into a ribbon material while leaving a bridge section between the component and the ribbon material, a step of half-cutting the component formed in the step at the bridge section, and A step of insert-molding plastic into the component while returning the bridge part and molding a plastic bridge that joins the ribbon material and the component, and a step of assembling the insert-molded component with the plastic. A plastic insert molding method that consists of a process of separating bridges.