Simulation Study On Vitrified Bond CBN Grinding Wheel Wear Of Ultra-high-speed

With the rapid development of technology, Ultra-high speed grinding becomes an important kind of processing methods with its unique advantages in mechanical processing industry. But grinding wheel wear is one of the most factors restricting that development. In old days, the means of doing physics experiments and theoretical derivation often had been made in study on the wear mechanism of grinding wheel. Therefore, it not only costs too much labor and physical resources by doing physics experiments, but also gives people obscure feelings.With the development of the computer and the finite element simulation technology, it is a very creative solution that the finite element simulation and actual production are combined. It not only brings out intuitive feeling, but also its solution actually reflects the answer to the problem to be solved in a certain error allowed range. At present, in domestic, it is at an early stage that having a application in study on CBN grinding wheel wear of ultra-speed with the finite element simulation technology compared with the foreign. Therefore, characteristics, forms and reasons of grinding wheel wear of ultra-speed have been comprehensive done, based on lots of theories and literatures about finite element simulation method applied to them at home and abroad. and it establishes a theoretical foundation for establishing a mathematical model and a geometry model of the particle attrition. It provides theoretical and experimental basis for optimizing grinding parameters with the finite element stress analysis of the monolithic CBN wheel and abrasion wear and crushing wear of microcosmic grains,in order to conduct practical processing production. The paper mainly includes the following parts:(1) A theory formula of wearing capacity of a CBN grinding wheel is established based on the existing wear theory. According to the microstructure of grinding wheel, grinding grain model is established, which could maximizingly anomalous and stochastic characteristic, and it can be applied to finite element simulation, so it supplys tools of study on simulation CBN wheel wear. (2) In ANSYS, the finite element simulation model of grinding CBN wheel is set up, and a dynamic simulation of characteristics is done by grinding the whole wheel, loading local grinding wheel and alternatingly loading local grinding wheel abrasive layers. Though simulation results, Stress distribution and deformation in grinding is known, which provides simulating premises for microcosmic study on grain wear.(3) With the grain loaded different grinding spreeds and grinding depths, grain wears are simulated using a method of coupling SPH and FEM. The relationships of the volume wear of a single grain and spreed, depth or workpiece materials. The curves of the volume wears in different paramerers are drow, and usage counters are calculated, and the relatively optimized grinding parameter scopes are obtained.(4) A single grain for the finite element research of crushing wear is simulated, and the results with different grinding spreeds and grinding depths are obtained, and the cuvres of crushing wear and stresses of chosen nodes are also acquired. Best grinding parameters are summarized, so they can conduct actual producting.