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非球面光学零件是一种非常重要的光学零件，常用的有抛物面镜、双曲面镜、等。非球面光学零件可以获得球面光学零件所无法比拟的良好的成像质量，在光学系统中可以很好的矫正多种像差,改善成像质量,提高系统鉴别能力,它可以以一个或几个非球面零件来代替多个球面零件,从而达到简化仪器结构、降低成本的目的，并且有效地减轻了仪器的重量，所以目前我们对于高质量高精度的非球面零件的需求与日俱增。
目前，非球面零件的制造面临着加工成本高、加工效率低的难题，尤其是非球面零件中的楔形非球面零件，因为其底面并不是水平面，所以在用砂轮磨削工件上表面的过程中面临着加工难度大的问题，因此就需要一种能够改变工件相对位置的夹具——用于楔形非球面磨削加工的三轴旋转式夹具，使工件在被加工时处于相对水平的位置，从而降低工件的加工难度。
本文的主要工作包括：根据楔形非球面的加工需求，设计了组合杆式旋转夹具、凸轮式旋转夹具的结构方案。讨论了这两个方案的优点与缺点，研究夹具的夹紧机构；重点分析平口钳夹紧机构和斜楔式夹紧机构，通过对这两个方案的介绍与比较，从而引申出了最终方案。为了了解最终方案的性能参数，对夹具中的伺服电机、减速器及轴承做了选型；对上平台轴与下平台轴的直径做了估算，计算了上平台轴、下平台轴、旋转轴的惯性矩、刚度、切应力以及强度，同时计算了轴承的变形及刚度。
翻译：
Aspheric optical parts is a kind of optical parts is very important, commonly used in a parabolic mirror, hyperbolic mirror, etc.. Aspheric optical parts can get good imaging quality aspheric optical parts are incomparable, good correction of aberration in the optical system, to improve the quality of image, enhance the ability of the system identification, it can be one or several aspheric parts to replace a plurality of spherical surface parts, thereby simplifying the structure, reducing the purpose of cost, and effectively reduces the weight of the instrument, so we for the high quality and high precision aspheric parts demand grow with each passing day.
At present, manufacturing aspheric parts facing problems of high processing cost, processing efficiency is low, especially aspheric parts of wedge aspheric parts, because the bottom surface is not level, so the grinding on the workpiece surface in the process of facing the problems of difficult processing, hence the need for a to change the relative position of the fixture workpiece -- for three axis rotary clamping wedge Aspheric Grinding Machining, the workpiece is relative to a horizontal position to be processed, thereby reducing the difficulty of processing workpiece.
The main work of this paper includes: according to the processing demand wedge aspheric surface, design the structure scheme combined rod rotary clamp, cam type rotary fixture. Discuss the advantages and disadvantages of the two schemes of fixture, clamping mechanism; focus on flat-nose pliers clamping mechanism and a wedge clamping mechanism, through the introduction and comparison of the two schemes, which raises the final scheme. In order to understand the performance parameters of the final solution, the selection of servo motor, reducer and bearings in fixture; on the platform and the lower platform shaft shaft diameter do estimated, on the platform, platform shaft, shaft rotation axis moment of inertia, stiffness, shear stress and strength calculation, at the same time calculation the bearing deformation and stiffness.