Abstract:In order to solve the problem that the hydraulic and pneumatic loading forces of traditional superplastic forming machine tools can not change synchronously,the superplastic forming machine tool was taken as the research object,and the hydraulic and pneumatic control system of the superplastic forming machine tool was constructed.The technical parameters of the system were set,and the detection device and proportional valve were chosen.Based on the functional requirements of superplastic forming process,PLC program was designed,and linear difference method was used to realize pressure compensation in pneumatic system.Pressure output and adjustment were carried out according to predetermined parameters to ensure that ambient temperature and pressure were in normal area throughout the process.Thus,the hydraulic and pneumatic control system of superplastic forming machine tool with advanced principle,perfect function and simple operation was realized.Practice shows that using the system,the hydraulic pressure of the superplastic forming machine tool changes synchronously with the pneumatic loading force,and the operation effect in each process is good,which has reference value.