Experimental Research On Carbide Drill With Multi-facet For ZGMn13 High Manganese Steel

In recent years, with the rapid development of China's railways, for railway infrastructure requirements of increasingly stringent, the railway turnouts are one of the weakest link. It is related to the train speed, train speed are the work of one of the key influencing factors, while the railway switch structure and manufacturing quality also affect the smooth running of the train and safety. Railway Turnout material mainly ZGMn13 high-manganese steel, belong to difficult-to-machine materials, its first work-hardening characteristics of the main processing is a serious problem; second is extremely high temperature Decarburization to high manganese steel of the hole has caused great difficulties processing.In the drilling of high manganese steel, the domestic manufacturers have adopted double-faced carbide drill, dry cutting. The main disadvantage has: after the high temperature carbide welding blade material cracks easily, a direct result to tool breakage, cutting force and cutting temperature increases; cutter drill type imperfections, resulting in poor cutting, breaking difficult, after processing bolt hole wall overheat, crack and other quality problems, the impact of traffic safety.This paper mainly aims at the existing problems in the drilling process of high-manganese steel, applying new technology and new process, according to the specific processing requirements of the work piece, designs reasonable clip-on machine tool structure first, and solves the problem of the low-strength of tool, sub-chip, poor-chip, low-durability emphatically; and then analysis and comparison is made between the basic performance of the cemented carbide tool material and other tool materials, the optimization experiment of the tool material is performed to determine the grade of the cemented carbide which is suitable to process high manganese steel turnouts; Finally the contrast experiment on the carbide base drilling optimization and life expectancy is performed, in this experiment, three optimized geometrical parameters can be obtained which have an effect on carbide drill group. The experimental results show that carbide drill provides better drilling performance than double-faced carbide drill in factory.All research shows that the carbide drill, which through improve the tool structure, the tool material and tool geometry parameters can effectively prevent tool breakage and can greatly improve product quality, improve tool life. Consequently, it is worth popularizing and applying in practice.