Simulation And Experimental Study Of Drilling High Manganese Mteel

Under the effect of the larger impact load or contact stress, work-hardening occurred in the surface of high manganese steel rapidly, according to it, the deformed twins with high-density dislocation is generated which formed the high wear-resisting surface with good wear resistance. So it is widely used in mechanical equipment which are used in metallurgy, mine, building materials, railway, power, coal and so on, for example, railway switches, digging bucket teeth wall, hammer of crusher, ball mill liners, track shoe of tank.The initial hardness of high manganese steel is not very high, but the tensile strength (about 2 times higher than 45 steel) is high and the plasticity (about 4 times higher than 45 steel) is large, and its toughness (about 8 times higher than 45 steel)is also high. The experimental results showed that the austenite structure can be transformed into fine grain martensitie easily due to the plastic deformation, which lead to serious work-hardening, and the degree of hardening is higher than the austenite stainless steel, which can improve the hardness from the original 200HB to 500HB, and the depth of chill layer can be over 0.3mm, forming the high-hardness oxide layers with at high temperature easily.The high manganese steel is a difficult-to-cut material due to its mechanical and physical properties. The study of high manganese steel with the traditional experiment method takes a long time, consumes the cutting tool materials seriously and costs us a great deal. Finite element method, as an effective complement to test method, can simulate the dynamic cutting process which helps to understand the physical phenomena of removing materials. It is helpful to choose the optimal tool materials, optimize the tool geometry and reduce the cost of research if the finite element method is used to study the simulation of the drilling process of high manganese steel.The high manganese steel is difficult-to-cut material due to its mechanical and physical properties. The study of high manganese steel with the traditional experiment method takes a long time, consumes the cutting tool materials seriously and costs us a great deal . The finite element method, as an effective complement to the test method, can simulate the dynamic cutting process which helps to understand the physical phenomena of removing materials. It is helpful to choose the optimal tool materials, optimize the tool geometry and reduce the cost of research if the finite element method is used to study the simulation of the drilling process of high manganese steel.The simulation of the drilling process of high manganese steel is studied in this paper, seeking a proper numeric simulation method in order to replace the traditional method and reduce the research period and the cost. This paper studies the methods of establishing the model and the correlation theory in the simulation process based on the simulation experiments of the drilling process of high manganese steel. And has established the finite element model of high-manganese steel (ZGMn13) by using the commercial plastic forming finite element software DEFORM-3D. A research on conventional modeling method of the twist drill has been done. And a geometric model of twist drill is established based on the grinding principle and mathematical model of the twist drill. This paper also carries on the dynamic simulation of the drilling process of high manganese steel, obtaining the data of continuous cutting chips, drilling force and torque. The simulation results showed that the drilling force increases due to the increase of the feed rate, but it decreases when the cutting speed increases. In order to verify the simulation results, the drilling tests of high-manganese steel are performed, using the same cutting parameters. It is found that the simulation results are close to experimental results and the simulation is proved to be correct. So it can provide theoretical guidance and technical support to the production practice of railway switches.In order to cooperate with the studying team, a new test system is established using the existing drilling dynamometer in lab in this paper. The range of the existing drilling dynamometer, namely YDZ-II02 Piezoelectric Drilling Dynamometer which is designed and manufactured by Dalian University of Technology cannot meet the experimental requirements. For the reason above, some external mechanism are designed and added in order to construct a new test system which extends measuring range, meets the needs of the study work and saves expenditure.