JPS6431610A - Injection molding method performing monolithic molding of ready-made parts at time of injection molding - Google Patents

Abstract

PURPOSE:To prevent damage of parts, by a method wherein a cavity into a hole of which an end of ready-made parts have been inserted is registered with a cavity of the other mold, they are clamped together and both the molds are displaced along a guide pin. CONSTITUTION:A bushing 40 of a top force 35 is lowered by fitting the bushing 40 over a guide pin 30, and a tapered face 37 of a cavity 36 in abutted against a tapered face 33 of a cavity 21 of a bottom force 20. Although there is a gap of 0.02-0.03mm between the guide pin 30 and bushing 40, as the tapered faces 37, 33 are registered at high accuracy with each other, even if an insertion hole 38 is high-accuracy, the top of ready-made parts 23 is inserted reliably into an insertion hole 38. Then the top and bottom forces 35, 20 are lowered along the guide pin 30 until they abut against a base stand 29 while they are kept under a clamped state and injection molding is performed. With this construction, damaging of the part 23 by a corner of the insertion hole 38 can de prevented reliably.