With the development of aerospace, industry, microelectronics industry, modern and bioengineering technology, the demand for / precision mechanical parts (feature size in the micron to millimeter level) is increasingly urgent. Its structure and shape of the specificity of the parts material diversity, size and surface quality of the accuracy of the good to become a high-precision mechanical parts and their micro devices and equipment, the obvious characteristics of the use of functionality, material properties, structural shape, sex and other aspects of the requirements are also increasingly high.

With the rapid development of modern precision machining, precision machining technology fast development, slowly emerged a lot of precision machining technology methods, such as micro-precision machining technology, fast forming technology, ultra-processing technology.

In the appropriate time in the precision machining process insert heat treatment, can make the cold, hot process with good, to avoid deformation due to heat treatment. The arrangement of heat treatment, according to the purpose of heat treatment, generally can be divided into:

1, the purpose of the preparatory heat treatment is to remove the internal stresses generated during the manufacture of blanks, improve the cutting performance of metal materials, for the preparation of the later heat treatment. Belong to the preparatory heat treatment of tempering, annealing, normalizing, etc., generally arranged in the roughing before, after. Arranged before roughing, can improve the cutting performance of the material; arranged after roughing, is conducive to the removal of residual internal stress.

2, heat treatment should generally be arranged in roughing, semi-finishing after finishing before and after. Deformation of the heat treatment, such as carburizing quenching, tempering, etc., should be arranged before the finishing process, so as to correct the deformation of the heat treatment in the finishing process; deformation of small heat treatment, such as nitriding, etc., can be arranged after the finishing process.

3, aging treatment of aging treatment is to remove the internal stress, reduce the deformation of the workpiece. Aging treatment is divided into natural aging, artificial aging and ice-cold treatment of three categories. Ageing treatment is generally arranged after roughing, before finishing; for parts with good precision requirements can be arranged after semi-finishing and then an ageing treatment; ice-cold treatment is generally arranged after tempering treatment or after finishing or process then.

4, surface treatment for the surface or surface decoration, sometimes need to be coated on the surface or blue and other treatment of this surface treatment is usually arranged in the process of the process then.