1. Machining is a process of changing the overall dimension or performance of a workpiece with a processing machine.
2. According to the temperature state of the workpiece being processed, it is divided into cold processing and hot processing. Generally, it is processed at normal temperature without causing chemical or phase changes of the workpiece, which is called cold processing.
3. Generally, processing above or below normal temperature will cause chemical or phase changes of the workpiece, which is called thermal processing.
4. Cold working can be divided into cutting and pressure machining according to the difference of machining methods.
5. Hot working commonly includes heat treatment, calcination, casting and welding. In addition, cold and heat treatment is often used during assembly.
6. For example, when assembling bearings, the inner ring is often put into liquid nitrogen for cooling to shrink its size, the outer ring is appropriately heated to enlarge its size, and then it is assembled together. The outer ring of the wheel of the train is also sheathed on the substrate by heating, and its firmness can be guaranteed when it is cooled.
7. Mechanical processing includes: filament power winding, laser cutting, heavy processing, metal bonding, metal drawing, plasma cutting, precision welding, roll forming, metal sheet bending forming, die forging, water jet cutting.
8. Machining: generalized machining is the process of manufacturing products by mechanical means; Narrow meaning is the process of making parts with special mechanical equipment such as lathes, milling machines, - drilling machines, grinders, - stamping machines, - die casting machines, etc.
