基于ANSYS的超高速磨削初始状态的研究

Initial Condition at Ultra-High Speed Grinding Based on ANSYS

由于一般仿真分析都用简化的单一成份砂轮模型,而实际超硬磨料砂轮为减少昂贵的金刚石或CBN的用量,仅在轮芯表面粘结一层磨料,因此仿真与实际结果存在误差。在虚拟分析中砂轮的模型采用复合结构,采用ANSYS中的粘和技术,体现砂轮的轮芯及磨料的粘结,使分析结果更接近实际。利用有限元软件ANSYS仿真砂轮磨削初始状态,分析在砂轮极强冲击波作用下磨屑形成的条件。结果显示变形最明显的区域集中在磨粒与工件接触区的下方和前方,特别是在磨粒前下方形成一囊状的高压区。由于该区内材料产生了巨大的单向反弹力,迫使已处于半熔化状态的表面材料向压力相反方向即无约束的自由表面流动,从而使磨屑形成。

The general simulation analysis uses a single ingredient grinding wheel model, but actual grinding wheel only uses coats of grinding oompound on the grinding surface to reduce the amount of expensive diamond or CBN for practical ultra - rigid grinding wheel. There exist errors between simulation result and practical result. The grinding wheel model uses oompound construction by sticking technology of ANSYS to represent the cling between wheel core and the grinding materials, thus the analysis result is close to practicality. The thesis analyzes condition of forming grinding at strong shock wave of grinding wheel at the initial condition by ANSYS Obvious distorted region concentrates on underneath and front of grinding particles and work piece contact section. Especially, there is cyathiform high- pressure section at underneath and front of grinding particles. The surface material under the condition of half melting is compelled to flow to the reverse direction, that is none - restraint free surface. Thus, the grinding triturate is formed.