The world's first cold heading machine originated in Germany. At that time, the purpose of developing the cold heading machine was mainly to manufacture bullet casings in large quantities during World War II.
Cold heading process.
(1) According to the theory of metal plasticity, a certain pressure is applied to the metal blank at room temperature to produce plasticity in the mold cavity and form according to the specified shape and size.
(2) It is necessary to choose high-quality metal materials with good "plasticization", such as rivet steel, which has strict standards for chemical composition and mechanical properties.
(3) There are many models and series of cold heading bolt and nut forming machinery. The equipment has reliable performance, high efficiency and stable product quality.
(4) The product has a large forming and forging force, the configuration power is in, and the equipment is invested in a large time. Therefore, it is most economical to produce up to M24.
(5) It has good surface quality and high dimensional accuracy. Due to the existence of cold work hardening in the upsetting process, the deformation should not be too large. Reduces cracking.
(6) The cold heading process is applicable to products with large batches and various specifications, so as to reduce costs.
The modern cold heading machine has been increased from the simple two-station in the past to multi-station, and the newer varieties in China are 5-mold, 6-mold, 6-mold elongated cold heading machine.
