Metal machining technology, one of the main development directions of modern machinery manufacturing industry, plays an important role in improving the performance, quality and development of mechanical and electrical products, and has become a key technology for success in the competition. Ultra-precision machining refers to sub-micron precision machining.

The process methods and technical measures adopted to achieve these processes are called super-finishing technology. In addition to the measurement technology, environmental assurance and data and other issues, people call this technology is generally referred to as ultra-precision engineering. Since the advent of machinery, there have been corresponding mechanical parts. However, as a discipline, mechanical parts are separated from mechanical structure and mechanics. With the development of the machinery industry, new design theories and methods, new materials, and new processes, mechanical parts have entered a new stage of development.

Theories such as finite element method, fracture mechanics, elastic hydrodynamic lubrication, optimization design, reliability design, solid modeling system analysis of computer aided design and design methodology have been gradually used in the research and design of mechanical parts.

To better realize the integration of a variety of disciplines, metal machining to achieve the combination of macro and micro, to explore new principles and structures, more dynamic design and design, more effective use of electronic computers, and further develop design theories and methods, an important trend in the development of this discipline.

Machining is on the basis of the process, change the shape, size, relative position and nature of the production object, so that it becomes a finished product or semi-finished product, is a detailed description of each step, each process, for example, as said above, roughing may include blank manufacturing, grinding, etc., finishing may be divided into cars, fitters, milling machines, etc., each step will have detailed data, For example, how much roughness should be achieved, how much tolerance should be achieved.