What's the difference between cold heading and hot heading?

Cold heading: it is to use the plasticity of metal to apply pressure or cold drawing through cold working to achieve the purpose of solid deformation of metal. Forging method of thickening the top of bar or wire at room temperature. Wenzhou cold heading machine is mainly used to manufacture bolts, nuts, nails, rivets and steel balls. The forging blank material can be copper, aluminum, carbon steel, alloy steel, stainless steel and titanium alloy, and the material utilization rate can reach 80-90%. Cold heading is mostly carried out on special cold heading machine, which is convenient for continuous, multi-station and automatic production. Cutting, upsetting, stacking, forming, chamfering, wire rolling, reducing diameter and trimming can be completed in turn on the cold upsetting machine. The production efficiency is high, which can reach more than 300 pieces/minute, and the maximum diameter of cold heading workpiece is 48 mm The diagram of bolt working procedure of cold heading machine is a typical cold heading bolt working procedure. Multi-station nut automatic cold heading machine is a multi-station nut automatic cold heading machine. The bar is automatically fed to a certain length by the feeding mechanism, cut into blanks by the cutting mechanism, and then sent to the stacking and punching stations in turn by the fixture conveying mechanism for molding. Multi-station cold heading machine refers to stamping raw materials at room temperature.

Hot upsetting: refers to the stamping of raw materials after heating, and has no special requirements for specific purposes. Under normal circumstances, cold heading is needed, because of this surface smoothness, the organizational composition of the material will be denser, and hot heading is often used for larger workpieces.