Special machine tool is a kind of machine tool that uses specific parts and processes to process, and is often an indispensable type of machine tool in the automatic production line production system. Modular machine tool is a kind of special machine tool, which is based on standardization and consists of a few special parts. Now some machine tool factories are also used to using special machine tools to replace their general machine tools if they make changes. Special machine tools occupy a certain proportion in production practice. According to relevant information, the output value of special machine tools in Japan reached 8.8 percent in 2001; The figure for Taiwan reached 6.9 percent; In China, it is only 0.67 percent. Therefore, in the adjustment of product structure, it is a noticeable problem to install machine tools in the industry.

The problems existing in special machine tools include: difficult skills, because it integrates processing technology, machine tools, jigs, assistants, tools, inspection and measurement, logistics, etc. to achieve turnkey projects, and then touches on a wide and complex skill field. It is also a one-time production, so it is difficult to ensure a one-time success; Special machine tools with high operating risk are made according to the user's order "tailored". It is impossible to have a trial production and exploration process. To ensure a success, there is a considerable skill risk; It is difficult to cooperate because it is made at one time. It is not produced in batches like car parts. It is difficult to find a manufacturer of cooperative truss manipulator; Strong dependence on skills, because the whole process of special machine tools from planning, process preparation, production to assembly and debugging requires a group of experienced skilled personnel, managers and skilled workers; Small profit margin; Long skill growth period; Difficulties in personnel activities; It is difficult to introduce skills.

At present, the international automatic machine tool assembly line industry is developing rapidly, and the machine tool products are being updated at an accelerated pace. The requirements for its functions, functions, productivity, quality, etc. are constantly improving. Although China's machine tool industry has made great achievements and the mechanical manufacturing skills have been greatly developed and improved, there is still a big gap compared with the international advanced level because of the weak foundation and backward scientific skills. The main performance is as follows:

1. High precision machining cannot meet the needs of modern science and technology development;

2. Lack of production skills and equipment for automation, numerical control and flexibility;

3. Unstable product quality, poor accuracy retention and short service life;

4. The research on the basic theory of machine tools is backward, and the production management level and personnel quality are not high.