In order to achieve the required hardness of machine tool castings and make large castings have mechanical properties, physical properties and chemical properties, in addition to the reasonable selection of materials and various forming processes, heat treatment processes are essential. The heat treatment of machine tool castings is an important process in mechanical manufacturing. Compared with other processing technologies, heat treatment generally does not change the shape of the workpiece and the overall chemical composition. Instead, it changes the microstructure inside the workpiece, or changes the cast iron platform and machine tool. The chemical composition on the surface of the casting gives or uses the performance of the workpiece. It is characterized by the inherent quality of cast iron platforms and machine tool castings.
产品作为一种大型铸件须要经过时效处理才能提高本身的使用性能，_床身铸件的内在质量。 As a large-scale casting, machine tool castings
need to undergo aging treatment in order to improve their performance, and the inherent quality of bed castings. The overall heat treatment of castings such as machine tool castings, bed columns, and machine tool benches generally includes four basic processes: annealing, normalizing, quenching, and tempering.
When tempering machine tool castings, the tempering process should be strictly followed. Support ribs should be added in the dense or easily deformed parts of ribs to prevent deformation and fracture due to tempering temperature. Someone should take care of the tempering furnace thermometer and control the temperature in time to prevent the temperature from being too high or too low, which will have a great impact on the tempered workpiece of the machine tool casting