数控切割机床编程系统设计与开发

编写了可广泛应用于火焰切割、线切割、激光切割等离子切割等切割机床的计算机编程软件，利用此软件可根据绘制的工程零件图生成控制切割机床的数控程序，并可对生成的数控程序及巳有的数控程序进行仿真，少检查程序的正确性，实现了切割加工过程的CAD/CAM一体化。     

Research on mechanical properties of 22MnB5 steel quenched in a steel die

22MnB5 is one of the most typical hot stamping boron steels. In order to study the effect of austenitizing temperature and holding time on the mechanical properties of hot stamping boron steel 22MnB5, a series of quenching process are done. The tensile strength and hardness of 22MnB5 samples are measured. The results show that 22MnB5 has a good quenching performance, and the tensile strength and hardness of samples quenched in a water-cooled steel die are similar to those of water quenching. The higher tensile strength and HRC hardness are achieved when austenitizing at temperatures of 880–910 °C. Holding at 910 °C for 5 min and then quenching gives rise to a better combination of tensile strength, hardness and ductility.