Insert molding, in which an insert is set in the mold and molded at the same time as the injection molding process, is an indispensable molding technology for mass production because it does not require any post-processing.
Insert molding is an essential molding technology for mass production because it does not require any post-processing.
However, the machine to set the insert in the mold and the coaching are costly.
For products with low production volume, inserts are sometimes cold-press-fitted in a post-processing step.
For example, in the following product, four insert collars are cold press-fitted.
The problem during this cold press fit is that the insert may be set tilted because the product surface is a C-face when the insert is set. (It cannot be set stably.)
If the insert is press-fitted with a tilted position, many burrs or cracks will be produced.
Therefore, we created a jig using a luring pin so that the center of the insert collar can be determined. The pin would interfere with the press-fit head if left as it is, so a spring was installed under the luring pin to make it movable. This enables press fitting while maintaining the center of the insert collar.
The use of this jig enabled us to achieve zero press-fit defects even in mass production of 200,000 units.
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