CNC lathe processing is a high-precision, high-efficiency automated machine tool with digital information to control the displacement of parts and tools mechanical processing methods. It is an effective way to solve the problems of changing varieties, small batches, complex shapes and high precision of aerospace product parts and other parts, and to achieve efficient automatic processing. In CNC lathe machining workpiece, there is generally a heat treatment process, the following points.
First, prepare for heat treatment. The purpose of the preheat treatment is to improve the cutting performance of the trend, eliminate the residual stresses in the manufacturing era of CNC lathe machining blanks and improve the organization. Its process location is mostly before machining, commonly used in annealing, normalizing, etc.
Second, the elimination of residual stress heat treatment. As the internal stress generated by the billet in the manufacturing and machining process will lead to deformation of the workpiece and affect the quality of processing, it is necessary to arrange the residual heat treatment. Heat treatment of residual stress should be arranged in the rough machining before finishing.
For the parts with low precision requirements, the artificial aging and annealing of residual stresses are usually arranged before the billet enters the machining workshop. For complex castings with high accuracy requirements, usually arrange two aging treatments in the machining process: casting - rough machining - aging - semi-finishing - aging - finishing. For high-precision parts, such as precision steel wire, precision spindle, etc. Should be arranged for several times to eliminate residual stress heat treatment, or even cold treatment to stabilize the size.
Third, the final heat treatment. The purpose of the final heat treatment is to improve the strength, surface hardness and wear resistance of the parts, usually arranged in the finishing process (grinding process) before. Commonly used are quenching, carburizing, nitriding, carbonitriding.