JPS6475223A - Insertion joining method of plastic through oscillation heat joining - Google Patents

Abstract

PURPOSE:To prevent formation of flashes by making the strength of a matrix high and to contrive improvements in smoothness and an external appearance of a finished surface of a product, by joining an insert and the matrix to each other by constituting the title method so that they are not brought into contact directly with each other, but brought into contact with a punch and floating punch. CONSTITUTION:A matrix 10 is clamped to a main body 16 with a top and bottom dies 4, 5 and a top and bottom punches 2, 3 are displaced vertically repeatedly under a vibrating state. In this instance, a shearing sphere in the vicinity of an abutting face between a floating punch 1 and the matrix 10 is led to a flowing condition by heating the same and the matrix 10 is punched out by rising rods of servocylinders 6, 7 synchronously while the vibrating state is being kept on. Then when an insert 21 is inserted into a punched hole 18, oscillation heat fusion between the punched hole 18, whose inner circumference of a cut end surface is softened thermally, and an external circumferential surface of the insert 21 is achieved. In this case, punched scrap 11 of the matrix 10 is inserted among an upper punch 2, other plastic material 20 and the floating punch 1 as the insert of the plastic material 20 and the oscillation heat fusion of the insert 11 to a punched hole 28 is performed.