【作者】 洪福星；

【导师】 周廷美；

【作者基本信息】 武汉理工大学 ， 机械制造及其自动化， 2008， 硕士

【摘要】 树脂薄片切割砂轮(以下简称锯片)是磨具产品中最常见的产品之一。但在高速锯切领域,国内产品与国外产品有较大差距,目前国内公司已经开始从事高转速及超高转速磨具产品的生产与开发。为保证锯片在高转速下稳定安全工作,产品从配方到用料、加工、以及成品检测都有较严格的规定。其中锯片成品检测包括平面度检测、静平衡检测、回转试验以及锯切试验等。锯切试验作为砂轮出厂的最后一道检测工序,它的数据直接反映出一批产品的锯切性能。针对现有高速锯片锯切试验方法的缺陷,本文分析了该试验对锯切试验机及其零部件的要求,提出了锯切试验机的总体设计方案及各部件的具体解决方案。根据该方案,设计并制造出高速锯片锯切试验机。该试验机实现了锯片在锯切过程中定进给力的加载,解决了高转速下轴承可能出现的发热及整机的震动问题,较为简单地实现了大直径工件的夹装、调心及旋转,很好地解决了高速锯片在锯切大直径工件时的散热问题。根据锯切试验检测锯片的具体情况,给出了判定锯片质量好坏的方法,提出锯切效能的概念。为了研究高速锯片在锯切大直径工件时的性能,为试验机的改进提供解决方案,以及为大直径、高速度锯切机床的研制提供理论依据,本文分别采用试验及仿真分析的方法研究了锯片在磨削切割区温度场的分布情况。试验采集了锯片在锯切直径为160mm圆钢时周围环境温度随时间变化的数据。分析锯切工况,得出锯片锯切进给模型及边界条件加载模型。根据以上分析,使用APDL语言建立了工件有限元实体模型,完成了时间变化载荷的加载、分析及后处理。最终得出数据结果以及温度场分布图,同时与试验采集数据进行对比,实现分析数据对机器设计改进的指导。更多还原

【Abstract】 Thin resinous grinding wheel (here in after referred as grinding wheel) is one of the most common products in abrasive field. However, in the field of high-speed sawing, there is a wide gap between domestic and foreign products. Now, the domestic companies have begun to engage in the development of high-speed grinding wheel products. To ensure the grinding wheel to be security and stability under high-speed operations, the products of grinding wheel have stringent criterion in the process of confect, product, material choice and check. The check process including flatness detection, static balance detection, rolling test as well as cutting test and so on. Cutting test as the final process before production get out of factory, its data is a direct reflection to the quality of a number of grinding wheel.In allusion to the defect in actual saw cutting testing machine, the requirement of saw cutting testing machine and it’s components under high speed condition were analyzed. Proposed an recapitulative design scheme of the testing machine and the solution of each components. Under the program, designed and manufactured high-speed saw cutting testing machine. The machine achieved the force loading of fixed value in the process of cutting test, solved the potential problem of hot in bearing and shaking in machine, achieved in the clamp and rolling of large diameter workpieces. According to the actual circumstances of cutting test, the article given a method of how to judge the quality of grinding wheel, taken out a conception of cutting efficiency.In order to study the capability of high-speed grinding wheel in machining large-diameter workpieces, offer academic bases to high-speed and high-efficiency cutting machine tool, this article used experimental and simulative method to analysis the lapse rate around grinding wheel. Test collected mutative temperature data around grinding wheel when incise the workpiece with a diameter of 160mm round. Analysis of the sawing condition, come into the sawing model and the loading model of boundary condition. Based on the above analysis, language of APDL was used to finish modeling, loading, meshing and solution of entity. Finally, the paper got the results of analysis data, as well as temperature distribution graph. Contrasting with the collecting data, then achieve the aim of theory guidance of practice.更多还原