A part cold heading
machining method includes the steps that firstly, a part blank is extruded by a first
stamping die (1) to obtain sizes required by head taper and rod
necking; secondly, a part (2) obtained in the first step is extruded by a second
stamping die (3) to obtain the contour and size of the head of the part; thirdly, the part (2) obtained in the second step is extruded by a third
stamping die (4), and a trimming die of a bottom die conducts reverse
cutting on the part (2) obtained in the second step to obtain the needed shape and the needed size of the contour of the neck of the part; fourthly, upper and lower double
cutting is carried out on the periphery of the head of the part (2) machined in the third step through a fourth stamping die to obtain the shape and size of the contour of the head of the burr-free part, and the whole part cold heading
machining process is completed. The part cold heading
machining method has the advantages that the
utilization rate of materials is high, the materials are saved, cost is saved, the procedures are simple, the dies can conduct one-shot machining forming as long as the part is placed at an appointed position, efficiency is high, adjustability is high, the reject rate is lowered, burrs can be effectively removed, and the application effect is good.