A forging method of roughening the top of a bar or wire at room temperature. Cold heading is mainly used for manufacturing parts such as bolts, nuts, nails, rivets, and steel balls. Forging materials can be copper, aluminum, carbon steel, alloy steel, stainless steel, and titanium alloy, with a material utilization rate of 80-90%.
Cold heading is often carried out on specialized cold heading machines, facilitating continuous, multi-station, and automated production. On a cold heading machine, it is possible to sequentially complete processes such as cutting, heading, accumulation, forming, chamfering, wire rolling, diameter reduction, and edge cutting. High production efficiency, up to 300 pieces/minute or more, with a maximum diameter of 48 millimeters for cold heading workpieces. The schematic diagram of the cold heading bolt process in Figure 1 is a typical process for cold heading bolts. The multi-station nut automatic cold heading machine shown in Figure 2 is a multi-station nut automatic cold heading machine. The bar material is automatically fed into a certain length by the feeding mechanism, and the cutting mechanism cuts it into blanks. Then, the clamp conveying mechanism sequentially sends it to the accumulation pressing and punching stations for forming.
In the cold heading method, cold heading machines can be divided into two types based on their different modes of power transmission: mechanical transmission and hydraulic transmission. There are two types of mechanical transmission: manual and electric. Electric and manual cold heading machines are suitable for cold heading low-carbon steel wires with a diameter of 4-5mm. Hydraulic transmission can be further divided into two types based on its performance: hydraulic steel wire cold heading machine and hydraulic steel bar cold heading machine.
