(1) According to the theory of metal plastic deformation, a certain pressure is applied to the metal blank at room temperature to make it plastically deform in the mold cavity, so that the metal blank can be shaped according to the specified shape and size.
(2) High-quality metal materials with good plastic deformation, such as riveted rebar, must be selected, and their chemical composition and mechanical properties have strict standards.
(3) There are many models and series of cold heading bolt and nut forming machines. The equipment has reliable performance, high efficiency and stable product quality.
(4) The product has large upsetting force, large configuration power and large investment in disposable equipment. Therefore, the production specifications below M24 are the most economical.
(5) Good surface quality and high dimensional accuracy. Because there is cold working hardening during upsetting, the deformation should not be too large. Reduce cracking.
(6) The cold heading process is suitable for products with large quantities and specifications, thus reducing the cost.
Modern cold heading machine has been increased from simple two-station to multi-station in the past. At present, there are five-die, six-die and six-die extended cold upsetting machines in China.