The specific process of annealing heat treatment of cold extruded piston pin blank using medium frequency induction heating power supply

The main purpose of annealing cold extruded piston pin blanks using medium frequency induction heating power is to reduce hardness, improve plasticity, and prepare for the extrusion process. The annealing requirements and typical processes of several materials are shown in the table below.

After annealing, the billet still needs phosphating treatment to improve cold extrusion conditions, reduce the extrusion force required for extrusion forming and increase the life of the extrusion die.

A factory uses medium frequency induction heating, and the spiral induction coil is 1500mm long. The total heating time of the piston pin blank with a diameter of 28mm in the induction coil is about 1 minute. The blank is heated to 600°C and then extruded one by one.

Many manufacturers use the above process for annealing heat treatment, and the cold extruded piston pin blanks produced are of good quality and meet the needs of the work. If you still don’t know anything about this annealing process, you can read books on heat treatment. I believe you will gain a lot.