毕业设计-数控磨床自动移动中心架毕业设计说明书【值得参考】.docVIP

e 题 目 数控磨床自动移动中心架设计 学生姓名 e 学号 e 所在学院 机械工程学院 专业班级 e 指导教师 e 完成地点 e 2009年6月18日 数控磨床自动移动中心架设计 e （e） 指导教师：e [摘要] 一般来讲，轴的长度和直径之比越大，则刚度越小.特别是细长轴，由于工件的刚性减弱，切削力使工件变形加大，在磨削过程中，细长轴在磨削力和磨削热的作用下容易产生变形、发生震动、出现较大的加工误差。应此，磨削细长轴的关键是如何增加工件的支撑刚度，减小磨削力和磨削热。故机床在加工细长轴这类特殊零件的时候，采用方法之一就是中心架支撑，中心架是保证这类工件在数控机床上加工精度的主要附件之一。为了解决上述问题，本文对传统现有的中心架进行分析对比，设计了一种液压自动定心中心架，主要完成了从方案的初步设计再到结构设计原理说明进行了详细的介绍。难点在于安装中心架时支持中心与工件中心相重合。磨削后的支撑圆的径向跳动偏差在0.02～0.03mm之间。能实现自动定心、自动移动，绘制了装配图及安装图，阐述了液压控制原理并且此液压中心架在数控磨床上安装方便、运行可靠。能更好的满足数控磨床在加工工件时的精度要求。 [关键词] 中心架； 数控磨床； 自定心； 液压控制 Design of the automatically move CNC grinder center frame e e) Tutor:e Abstract: Generally speaking, shaft length and diameter is bigger, the stiffness is smaller. Especially the slender shaft, the rigidity of the workpiece is abate, the cutting force so that the workpiece deformation increase, in the grinding process, the grinding force and the grinding of slender shaft under the action of heat easily deformed, vibrate, appear the processing error, the larger the grinding of slender shaft. The key is how to increase the stiffness of workpiece support, reducing the grinding force and the grinding heat. Therefore, in the processing of slender shaft of this kind of special parts of the machine tool, the method is one of the central frame support, center frame is one of the main accessories of this kind of workpiece in CNC machine tool accuracy. In order to solve the above problem, this paper carries on comparative analysis of existing center frame, design of a hydraulic automatic centering fixture, mainly completed the preliminary design to the structure design principle that were introduced in detail. The d