[Abstract] Machining includes: laser cutting, heavy-duty machining, metal bonding, metal drawing, plasma cutting, precision welding, roll forming, sheet metal bending, die forging, water jet cutting, precision welding, etc.

Machining is a process of changing the external dimensions or properties of a workpiece with processing machinery. According to the temperature state of the workpiece to be processed, it is divided into cold working and hot working. Generally, it is processed at room temperature and does not cause chemical or phase changes of the workpiece, which is called cold working. Generally, processing above or below normal temperature will cause chemical or phase changes of the workpiece, which is called hot working. Cold working can be divided into cutting and pressure working according to the difference in processing methods. Hot working is commonly used in heat treatment, calcination, casting and welding. In addition, hot and cold treatment is often used during assembly. For example, when the bearing is assembled, the inner ring is often cooled into liquid nitrogen to shrink its size, and the outer ring is properly heated to enlarge its size, and then it is assembled together. The outer ring of the wheel of the train is also heated to the substrate, which can ensure the firmness of its bonding when cooled (I don‘t know if this method still exists.)

Machining includes: laser cutting, heavy machining, metal bonding, metal drawing, plasma cutting, precision welding, roll forming, sheet metal bending, die forging, water jet cutting, precision welding, etc.

Machining: The broad meaning of machining is the process of manufacturing products by mechanical means; the narrow meaning is the process of making parts with special machinery such as lathes, milling machines, drilling machines, grinders, stamping machines, and die-casting machines.