Dalian precision machining is different from ordinary machining. It requires higher precision than ordinary machining. It mainly uses machining machinery to change the overall dimension of the workpiece. According to the temperature state of the workpiece to be processed, it can be divided into two types: cold processing and hot processing. It is mainly used to process precision mechanical parts in aircraft control equipment.

Such as precision fitting parts in hydraulic and pneumatic servo mechanism, gyroscope frame, shell, air floating, liquid floating bearing components and float, etc. The structure of aircraft precision parts is complex, the stiffness is small, the precision is very high, and the proportion of difficult to process materials is large. There are also specific and strict requirements for length, width and height, and the positive and negative errors are also specified.

For example, if the diameter of an embedded cylinder is too large and exceeds the allowable range of error, it will be unable to insert. If the actual diameter is too small and exceeds the lower limit of the allowable negative value of error, it will be too loose and unstable. Precision machining, not all materials can be precision machined. For example, if some materials with too high hardness exceed the hardness of machining parts, some special materials are not suitable for precision machining.

Heat treatment process is often arranged in machining process route. The position of heat treatment process is arranged as follows: in order to improve the cutting performance of metal, such as annealing, normalizing, quenching and tempering, it is generally arranged before machining. With the continuous development of domestic automobile, railway, transportation, aerospace and other industries and the continuous improvement of their requirements for high-quality castings, the market demand for domestic casting machinery products is expanding.