? ? ? ? ?The working principle of the cold heading machine is simple. It is a method of forming the top of the bar or wire rod at room temperature. Cold heading is mainly used to make bolts, nuts, nails, rivets and steel balls and other parts. The forging billet material can be copper, aluminum, carbon steel, alloy steel, stainless steel and titanium alloy, etc., and the utilization ratio of material can reach 80 to 90%. Cold heading is mostly carried out on a special cold heading machine, so it can realize continuous, multi station and automatic production. In the cold heading machine, it can finish cutting, upsetting, accumulating, forming, chamfering, rolling, necking and trimming in sequence. The production efficiency is high, up to 300 pieces / min. the diameter of the largest cold heading workpiece is 48 millimeters. Fig. 1 Sketch map of cold heading bolt process is the typical working procedure of cold heading bolt. Figure more than 2 station nut automatic cold heading machine for multi station nut automatic cold heading machine. The bar material is automatically fed to a certain length by the feeding mechanism, and the cutting mechanism cuts off the billet into a blank, and then is sent to the accumulated pressure form and the punching station in turn to form by the clamp transfer mechanism.
? ? ? ? ?Multi station cold heading machine has developed rapidly in developed countries, such as Europe, America and Japan, and its use is becoming wider and wider. At present, the major producing countries are developed countries such as the United States, Japan, Germany, Italy and the United kingdom. In recent years, cold heading machinery and equipment have a certain development in our country.
? ? ? ? ?The multi position cold heading machine is characterized by larger size, heavier body and higher upsetting force. The semi-finished products that can be drawn into bolts and relatively complicated special-shaped parts. It has advanced safety protection and automatic monitoring function. It can stop automatically and display the fault location of the test table when the fault occurs
? ? ? ? ?Processing technology of multi station cold heading machine can not only improve the productivity, save metal material, and because the streamline metal fiber with mold into a certain shape, improves the tensile strength of the products, improve the surface quality, ? ?dimensional accuracy, reducing the cost of products. Cold heading technology has obvious economic benefits, so it has been widely used in the mass production of precision steel pipe standard parts, NSK bearings bearings, magnetic separator and other industries. Therefore, multi station cold heading machine developed very fast, many varieties, as well as roller, steel ball, automatic cold heading machine, etc..
