A BUILT-UP HOLE MOLDING METHOD OF THE INJECTION MOLDING PRODUCTS AND CORE-FIN FOR BUILT-UP HOLE MOLDING

摘要

The present invention is to automatically process the assembly hole diameter of the injection molded product in the mold at the same time as ejection of the injection molded product or to force the assembly hole diameter to be forced, thereby improving the accuracy of the assembly hole diameter of the injection molded product and injection molded product The present invention relates to an assembly hole forming method and an assembly hole forming core pin of an injection molded product to eliminate an additional machining process of an assembly hole inner diameter of the injection molded product, and subtracted by a predetermined angle so as to be separated from the assembly hole of the injection molded product when the injection molded product is taken out. The cutting edge 12 is provided with a core pin 10 having a taper 16 formed at an angle α, and cutting the inner diameter of the assembly hole to a certain dimension when taking out the injection molded product at the upper end of the core pin 10. When forming the injection-molded product to the upper end of the core pin 20, or to force the flesh of the cooking hole inner diameter is pushed to fit the assembly hole inner diameter to a certain dimension. It is characterized by the formation of the projections 22.