Metal heat treatment is an important process in mechanical manufacturing, compared with other processing processes, heat treatment generally does not change the shape of the workpiece and the overall chemical composition, but by changing the internal microstructure of the workpiece, or changing the chemical composition of the surface of the cast iron platform and bed castings, giving or improving the performance of the workpiece. It is characterized by improving the intrinsic quality of cast iron platform and bed castings. As a large casting product, lathe casting must be heat treated to improve its performance and improve the internal quality of cast iron platform and bed castings.

   Integral heat treatment is a metal heat treatment process that heats the cast iron platform or lathe machine tool castings as a whole and then cools them at an appropriate speed to change their overall mechanical properties. Overall heat treatment is roughly annealing, normalizing, quenching and tempering four basic processes. In order to make the cast iron platform and bed castings have the required mechanical properties, physical properties and chemical properties, in addition to reasonable selection of materials and various forming processes, heat treatment process is essential. Steel is the most widely used material in the machinery industry, the microstructure of steel is complex, can be controlled by heat treatment, so the heat treatment of steel is the main content of metal heat treatment. In addition, aluminum, copper, magnesium, titanium and their alloys can also change their mechanical, physical and chemical properties through heat treatment to obtain different performance.