The difference between cold working and hot working

The difference between cold working and hot working

Cold working usually refers to the cutting of metals. A process in which excess layers of material are removed from a blank or workpiece with cutting tools, including cutters, abrasives and abrasives, to obtain a specified geometry, size and surface quality of the workpiece. Any cutting process must have three basic conditions: the cutting tool, the workpiece and the cutting motion. The cutting tool should have a cutting edge, and its material must be harder than the workpiece. Different tool structures and cutting motion forms constitute different cutting methods. The cutting methods with fixed blade shape and number of cutting tools include turning, drilling, boring, milling, planing, broaching and sawing, etc. Grinding, grinding, honing and polishing are the methods of cutting with abrasive tools or abrasives with unfixed blade shape and number. Cold working can lead to unwanted effects. Such as a decrease in ductility and an increase in residual stress. Since the mechanism of cold working or work hardening is to increase dislocation density, any treatment method that can rearrange or eliminate dislocations can eliminate the effect of cold working. In metallogy, the process above the recrystallization temperature of the metal is called hot working. Hot working can be divided into metal casting, hot rolling, forging, welding and metal heat treatment and other processes. Sometimes thermal cutting, thermal spraying and other processes are included. Hot working can improve the microstructure of metal parts while forming, or change the crystallization state of the formed parts to improve the mechanical properties of the parts. Casting and welding is the melting and solidification of metal. The main differences between cold working and hot working are as follows:

First, different purposes

1.cold processing: improve the hardness and strength of the workpiece.

2.hot processing: improve the mechanical properties of the organization.

Two, the way is different

1.Cold processing: plastic deformation of metal at lower than recrystallization temperature processing technology.

2.Hot processing: The processing method of plastic deformation and recrystallization of metal materials at the same time under the condition of higher than the recrystallization temperature.

Three, the inclusion process is different

1.cold processing: such as cold rolling, cold drawing, cold forging, stamping, cold extrusion and so on.

2.Hot working: Hot working usually includes casting, forging, welding, heat treatment and other processes.

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