砂轮测量用定位机构设计

发布时间：2018-05-02 13:43

本文选题：设计方法 + 楔爪式定心夹具　；参考：《华侨大学》2017年硕士论文

【摘要】：磨削加工作为常用的切削加工方法,日趋得到了越来越普遍的应用。砂轮作为磨具中用量最大、使用最广的一种,其表面结构和形貌对磨削加工有着至关重要的影响。在对金刚石砂轮表面进行测量时,采用非接触式的测量方法。针对白光干涉垂直扫描的方法,需要设计专门的砂轮检测装置。但是在现实中砂轮种类繁多,对不同内孔的砂轮进行测量时拆装不便且不能有很好的定位。本文设计并优化了测量用的砂轮定位机构,采用楔爪式自动定心夹紧装置,针对内径变化范围为30mm至40mm间的砂轮规格,能方便拆装并快速定位夹紧,且能保证砂轮与旋转轴具有较高的同轴度要求。同时夹具在满足使用要求的情况下尽可能紧凑、轻便,保持较小的受力变形。从而为砂轮的测量提供便利。本文的主要研究工作如下:(1)从常用的定位、夹紧方案入手,根据夹具的设计步骤和方案的对比,设计了最满足要求的楔爪式定心夹具,详述了楔爪式定心夹具的工作原理,绘制了该夹具的各零件图与装配图,形成了一套完整的夹具设计方案。(2)运用材料力学、机械设计等相关理论,对楔爪式定心夹具中重要零件进行了初步的理论校核,验证满足了强度等要求,为夹具的合理性设计提供最初的分析。(3)运用有限元理论,将楔爪式定心夹具的各零件按实际尺寸在solidworks软件中建模并导入ansys软件中,并按实际情况加载边界条件,对楔爪式自动定心夹紧装置中的各零件进行参数化的有限元分析,得出各零件的结构变形和应力分布,验证出其变形位移与理论变形分析相符,最大应力值处于材料的许用应力范围之内,满足设计要求,形成一套完整的夹具设计方案,并将制作出的夹具应用于实践。
[Abstract]:As a common cutting method, grinding has been used more and more widely. As one of the most widely used grinding tools, the surface structure and morphology of grinding wheel play an important role in grinding. In the measurement of diamond wheel surface, non-contact measuring method is adopted. For the method of white light interference vertical scanning, it is necessary to design a special grinding wheel detecting device. However, there are many kinds of grinding wheels in reality, so it is difficult to disassemble and assemble the grinding wheels with different inner holes and can not be well positioned. In this paper, the grinding wheel positioning mechanism for measurement is designed and optimized. A wedge claw type automatic centering clamping device is adopted. Aiming at the grinding wheel specification between 30mm and 40mm in the range of inner diameter variation, it can be easily disassembled and clamped quickly. And can ensure that the grinding wheel and rotation shaft have higher coaxial requirements. At the same time, the fixture is as compact and light as possible to keep small deformation. Thus, the measurement of grinding wheel is convenient. The main research work of this paper is as follows: (1) starting with the commonly used positioning and clamping scheme, according to the comparison of the design steps and schemes of the jig, a wedge-claw centering fixture is designed, and the working principle of the wedge-claw centering fixture is described in detail. Drawing each part drawing and assembly drawing of the fixture, forming a set of complete fixture design scheme. (2) using the theory of material mechanics and mechanical design, the paper makes a preliminary theoretical check on the important parts in the wedge-claw centering fixture. The verification meets the requirements of strength, and provides the initial analysis for the rational design of the fixture. The finite element theory is used to model the parts of the wedge-claw centering fixture in the solidworks software according to the actual size and to import them into the ansys software. According to the actual loading boundary condition, the parameterized finite element analysis of each part in the wedge-claw type automatic centering clamping device is carried out, and the structural deformation and stress distribution of each part are obtained, and it is verified that the deformation displacement is consistent with the theoretical deformation analysis. The maximum stress value is within the allowable stress range of the material, which meets the design requirements and forms a set of complete fixture design scheme, and the jigs made are applied to practice.
【学位授予单位】：华侨大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TG743

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