Metal plastic working method is a technological method to obtain the required shape and size through plastic deformation of solid metal. According to the processing temperature, it can be divided into cold working and hot working, and the temperature limit of both methods is the recrystallization temperature of metal materials. Hot working method has small deformation resistance, good plasticity and easy molding; Cold working method has great deformation resistance and poor plasticity, but the product has smooth surface, high dimensional accuracy and good mechanical properties.

basic content

According to the processing tools, there are: ① Forging, that is, putting the blank between a pair of tools, and plastically deforming the blank by impact or static pressure to obtain the workpiece with the expected size and shape. (2) Extrusion, that is, the blank is put into an extrusion cylinder, and the product is extruded from holes with a certain shape and size. (3) Rolling, that is, the metal to be processed is plastically deformed by a rotating roller, so as to obtain a finished product with the required shape. (4) Drawing, that is, the metal to be processed is deformed into finished products such as wires, tubes, rods, wires and the like through a conical drawing die with an inclination angle of 5-20 degrees. ⑤ Sheet metal processing is a finished product in which the thickness changes little during sheet metal processing, but the cross section forms the required shape. Such as cold-formed profiles, sheet stamping, etc. ⑥ Combined processing: For a specific product, various plastic processing technologies are combined with welding and cutting for processing. Spiral welded steel pipe and metal continuous casting and rolling in metallurgical process are both examples of combined processing.