Before the Industrial Revolution, machines were mostly made of wood structures by carpenters. Metals (mainly steel and iron) were only used to make small parts on instruments, clocks, locks, pumps, and wood-structured machinery. Metal processing mainly depends on the precision of the mechanics to achieve the required accuracy. With the widespread use of steam engines and the subsequent development of large machinery such as mines, metallurgy, ships and locomotives, more and more metal parts need to be formed and cut, and the metal materials used have developed from copper and iron to steel. Mainly.

   Mechanical processing (including casting, forging, welding, heat treatment and other technologies, and its equipment and cutting processing technology and machine tools, cutting tools, measuring tools, etc.) has developed rapidly, thus ensuring the supply of various mechanical equipment required for the development of production. At the same time, with the increase in production batches and the development of precision machining technology, it has also promoted the formation of a large number of production methods (part interchangeability production, profession division and collaboration, flow processing lines and flow assembly lines, etc.).