| With the advancement of the technology, China's railway construction is developing rapidly. At the same time, the requirements to the construction of railway infrastructure are increasingly stringent in the context of the trains' raising speed. The switch is the one of the most important railway components. In the present stage, the rail switch material is mainly ZGMn13 steel, which is a kind of difficult-to-machine materials. The large force and the high temperature which will accelerate the cutting tool wear and shorten the tool durability in cutting this kind of material. Therefore, the study of the cutting force and temperature variation of the high manganese steel is important to the actual production and the research of the cutting mechanism.The metal cutting force and temperature can be researched by simulation to reduce or replace the tests in order to save time and reduce cost.In this paper, the high-manganese steel stress-strain relationship at low and high strain rate was detected by the quasi-static compression test and Hopkinson pressure bar test, and then the constitutive equation of high manganese steel was determined by calculating the each parameters of the equation. The separation criterion of the simulation is Johnson-Cook shear failure criterion in order to make simulation results more realistic. The geometric separation surface between the chip and the machined surface is not need to be defined with this method.In this paper, the twist drill three-dimensional model which is used for finite element analysis was set up by the software ABAQUS. The force and temperature data of the twist drill were obtained by the three-dimensional dynamic finite element simulation of the drilling process based on one set of cutting parameters and the data have been analyzed to understand their sources and changes. Meanwhile, the changes of work piece temperature and drilling force were analyzed and compared under different cutting parameters which could affect the cutting force and temperature trends. The high manganese steel drilling force and temperature have been measured by drilling tests on the parameters in the cutting simulation to test the accuracy of the simulation results and the feasibility of drill dynamic simulation with the software ABAQUS. |
