Finite Element Simulating Of Hard Cutting Course

Hard cutting is a technology that takes cutting hardened steels as a method of semi-finish machining or finish machining. The traditional manufacture order such as cutting-harden-grinding may be changed by using this technology, and the weariness strength and productivity of workpiece is improved, and the consumed power is reduced. The hard-dry cutting is also a technology that is propitious to protect environment and carry out green manufacture. Finite element method is one of the powerful numerical analysis methods apply to engineering. It has many merits compare to testing research, such as save time, save manpower, save resource and so on. This paper based on finite element theory, was dead against the characteristic of hard cutting, found a finite element model for hard cutting. In finite element simulation of cutting course, correct predigested model not only may improve precision of calculated result, but also can smartly reduce calculating time. The paper adopts plane strain model to deal with planar hard cutting, smartly predigests calculated model; introduces a function about temperature to material Physical and mechanical property simulating material non-linearity; using element rezone to resolving contact penetrate problem and simulating chip shape; imports updated Lagrange increment finite element method for disposing geometry non-linearity problem in the hard cutting coursing; and programs an user subprogram to realizing finite elements'local subdivision, not only ensuring calculated precise, but also saving computer's resource; and adopts amended Coulomb friction model to solving friction problem in hard cutting. All these modeling methods have important reference worth for researching hard cutting theories. During finite element simulating, the paper gained hard cutting course's stress distributing, temperature distributing, and chip shape, and gained shearing angle during measure the shearing section. The paper simulated differ speed and differ cutting thickness'hard cutting course. The result of simulations indicated that cutting temperature increased with the increase of cutting temperature and cutting thickness. When cutting speed is higher than 220 meter per minute, the trend of cutting temperature increased would slow down due to metal soften. Cutting speed has more effect on cutting temperature than cutting thickness. And in same cutting conditions, the cutting tool with round cutting edge has higher cutting temperature than the cutting tool with the first face. So using round cutting edge instead of the first face would improve cutting tools'temperature distribution.The simulated methods in this paper can partially replace experimental research, and extended the applied fields of finite element theory, and accelerated the research of hard cutting theories.