气囊抛光工艺中接触面积的计算与仿真分析

Theoretical calculation and simulation analysis on contact area of ballonet polishing process

针对气囊抛光非球面工件时,气囊为了适应工件表面而使得自身形状发生改变,其接触边界复杂多变难以确定以及接触面积难以计算的问题,对气囊研抛头抛光大型椭圆非球面的研抛过程进行了分析及适当的假设,建立了研抛头与非球面接触区域的数学模型,提出了一种以几何方法建立的接触面边界求解参数模型,并借助有限元软件ABAQUS和ADAMS对接触边界进行了仿真计算。研究结果表明,采用该算法得到的参数模型计算结果和三维实体接触软件模拟计算结果接近,说明该算法可用于气囊抛光工艺中接触边界和面积的求解。

Aiming at the difficulties of identifying the complex contact conditions and the contact area of the aspheric surfaces ballonet polishing which were caused by the ballonet contacted with the workpiece surface and deformed its shape to fit the worked surfaces, the process of large aspheric surface ballonet polishing was analyzed according to the suitable assumption. The mathematic model of external contact area of the ballonet was founded, and a new parameter model was proposed. According to the geometric parameter model method, the boundary of contact area was analyzed and the contact area was solved, And the contact area was also calculated by ABAQUS and ADAMS. The results indicate that the calculated results is so close to the simulation results, that the geometric algorithms can be used to solve the contact area in the ballonet polishing process.