Cold heading: is the use of plasticity in metal, in the selection of cold mechanics for pressure or cold drawing, to achieve the purpose of solid deformation of metal.

Forging process in which the tops of rods or wires are thickened at room temperature. Cold heading is mainly used to make bolts, nuts, nails, rivets and steel balls. Forging billet materials can be copper, aluminum, carbon steel, alloy steel, stainless steel and titanium alloy, etc., the material utilization rate can reach 80~90%. Cold heading is usually carried out by special cold heading machine, which is convenient to realize continuous, multi-station and automatic production. In the cold heading machine can be completed sequentially cutting, heading, accumulation, forming, chamfering, wire rolling, diameter reduction and edge cutting. High production efficiency, can be more than 300 pieces/min, the maximum cold heading workpiece diameter of 48 mm. The procedure diagram of cold heading bolt is the typical procedure of cold heading bolt. Automatic cold heading machine for multi-station nuts. The bar material is automatically fed into a certain length by the feeding mechanism, which is cut off into billet by the cutting mechanism, and then sent to the accumulation and punching station by the clamp transfer mechanism in turn for forming.

In the diet industry, Lengdun refers to the production of cold meat, that is, to do cold mix, smoked sauce work, also known as white case. Hot dun is the production of frying and frying work, also known as the Red case.

In the diet industry, cold dun refers to the production of cold meat, that is, do cold mix, smoked sauce work. Hot dun, also known as the Red Table, is the work of frying and frying.

In terms of surface, cold heading products look more beautiful than hot heading products and have better finish. In terms of use, the hardness and strength of hot heading nuts are generally higher than those of cold heading products. For users with high requirements, there are great differences in materials.