Based On LS-DYNA Simulation And Research Of Ultra-High Speed Grinding

Plastic metal materials have excellent mechanical properties,the appropriate price and the good mechanical processing performance, so the application is very extensive in mechanical engineering. Hard and brittle materials have excellent mechanical,thermal and other properties. In recent years, the materials are widely used in aerospace,mechanical, military,precision manufacturing and other fields. In machining, as the physical change, grinding process is a complicated process. Common metal material is ductile plowing, and hard and brittle materials are microscopic plastic deformation and brittle fracture to remove material. Therefore, this paper will applie ultrahigh speed grinding technology to two kinds of materials processing, and strive to obtain good processing the quality at the same time, further study of different materials for grinding mechanism, and analyze grinding parameters on the grinding force, and surface quality of influence for practical mechanical processing, provides a theoretical support. Therefore, this paper applies to ultra-high speed grinding two kinds of materials processing.And with the good processing quality, in-depth study mechanism of the materials for different grinding mechanism, analysis of grinding parameters on the effect law of grinding force and surface quality.In this article the simulations and research of ultrahigh speed grinding process are performed for the ordinary metal and hard and brittle material by the finite element method. Because of hard and brittle materials have excellent mechanical,thermal and other properties, the mathematical model of grinding force are established, and a detailed way of theoretical analysis and research are made for the grinding force of grinding process and the way of removing. This paper mainly study the following aspects:(1) With the fluidsolid coupled FEM, simulation of abrasive grain cutting process, many abrasive grains delimit grits wipe materials and the description of morphology of materials in this article. The comparison and analysis are made for the influence of parameters in the grinding process.(2) Abrasive grain with the grits six surface and physical simulation model of grinding wheel is established, combining simulation model parameters and grinding classic formula model, a more reasonable mathematical model are deduced for the abrasive grain grinding the hard and brittle materials.(3) For the study of the material removal process including ductile plowing and brittle facture removal and the changes of grinding force by changing the speed of abrasive grain and cutting depth,the simulation and research are made for the abrasive grain cutting engineering ceramics by the Lagrange algorithm. Results show that:in the grinding process,the grinding parameters in the plastic deformation stage have more influence than that in the brittle fracture stage.(4) The influences of factors such as the grinding wheel speed, the grinding depthand thematerial properties are made for the grinding force and material surface quality, to provide feasible theory method for processing efficiency and surface processing quality, by contrasting the results of simulation for abrasive grain cutting plastic metal materials and hard and brittle materials.