Patent ID: 9634419
Date: 2017-04-25
CPC Classifications: B21J,B21K,H01R

Claim:
1. A cold forming method for forming power pins, comprising the following steps: step 1: cutting a blank out; step 2: pre-forming a power pin body by necking; step 3: trimming the pre-formed power pin body, and pre-forming a pin fixing disk; and step 4: forming the pin fixing disk and a staggered weld leg of the pin; wherein in the step 1, an intermittent automatic stepping blanking system is used to automatically cut the blank out with a proper length from a wire material with a diameter close to that of the circumcircle of the power pin body or a wire material with a proper intensification ratio, and synchronously convey the blank to a cold extrusion station in a multi-stroke cold forming machine through an automatic feeding system; and wherein in the step 2, the cut out blank is pushed into a first main mould for extrusion through a first die at a first stroke, so as to pre-form the power pin body by necking; successively form first, second, and third sections of the power pin; and eject the pre-formed blank through an ejector of the first main mould.