Integrated Shape/Property Control Method for Hot Power Spinning of a Cylindrical Part Based on Hot Processing Map

An integrated shape/property control method for hot power spinning of a cylindrical part based on a hot processing map, comprising:

• step (1):
• performing a high-temperature mechanical property test on a metal material at a temperature, a strain rate and a strain where dynamic recrystallization occurs, the temperature, strain rate and strain being dependent on the conditions required for dynamic recrystallization of the metal material during thermoplastic forming;
• step (2):
• performing an interpolation calculation on a flow stress-strain relation obtained with a limited number of test temperatures and strain rates;
• step (3):
• constructing, based on the power dissipation during the thermoplastic forming and a judging criterion for flow instability and on the expanded flow stress-strain relation obtained from the high-temperature mechanical property test, power dissipation maps and flow instability maps at different strains, respectively;
• step (4):
• combining the power dissipation maps with the flow instability maps to obtain a hot processing map of the material;
• according to a profile of a power dissipation rate factor η and the flow instability criterion, obtaining potential dangerous forming conditions met with the flow instability criterion, and forming conditions of safe forming conditions under which the thermoplastic forming is facilitated with the power dissipation rate factor η;
• and
• step (5):
• finally determining spinning parameters at the temperature and strain rate that facilitates the thermoplastic forming of the material according to the hot processing map, to perform hot power spinning of the cylindrical part, so as to obtain a cylindrical part satisfying the requirements of dimensional precision and structural properties.