王冲 毕业设计 打印版

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姓 名：学 院：专 业：题 目： 指导教师：

王 冲 学 号： 0802090534 机械工程学院 机械设计制造及其自动化 M250手动平面磨床工作台纵横向进给机构改进设计

孙丽英 讲 师

2012年6月

摘 要 摘 要

手动平面磨床是传统的机床产品，适合于中小型磨具、电子元件及各种小型工件的磨削加工。尤其适合于小工厂、家庭作坊，具有较大的市场容量。随着高速磨削和强力磨削工艺的发展，进一步提高了磨削的效率。因此，磨床的使用范围日益扩大，在金属切削机床中占的比重不断上升，在工业发达国家占金属切削机床的13%~27%。目前，我们对轴承加工设备，尤其是高精度、高效率、高可靠性的轴承磨床需求量十分庞大。轴承，作为机械工业的基础件，其加工设备的重要性非常突出。

随着现代科技的发展, 机械制造业面临着高速度、高精度等新的挑战, 高速进给系统成为高速高精度数控车床的关键环节之一。床身，作为主要支承件的床身至关重要，其结构性能的好坏直接影响着机床的各项性能指标。其结构的合理性和性能的好坏直接影响着数控车床的制造成本；影响着车床各部件之间的相对位置精度和在工作中各运动部件的相对运动轨迹的准确性。由于进给系统刚度低、惯量大, 难以获得高进给速度和高加速度,为了提高高速高精度数控车床的定位精度和传动精度, 除了正确设计、选择进给系统部件, 精确计算其强度、稳定性和驱动力矩外, 还要对进给系统的刚度进行合理设计, 减少因刚度引起的失动量, 以确保加工定位精度。

本文介绍了M250手动平面磨床工作台纵横向进给机构改进设计，手动平面磨床一般都采用滑动丝杠，为了更好的提高平面磨床的加工精度，在对M250手动平面磨床的进给机构进行改进时采用了滚珠丝杠，并且可以实现手动进给与机动进给两种控制方式。纵向进给实现连续的往复运动。横向进给机构可以实现手动、断续，连续三种工作方式，并且还设置了微量进给装置，通过手柄控制蜗轮蜗杆，手柄每转一转滚珠丝杠移动0.1mm，满足机床适应更大的加工范围。

关键词：手动平面磨床；横向进给；纵向进给；微量进给；滚珠丝

杠

I

Abstract Title:The improvement design of M250 manual surface grinding machine work table horizontal feed system and vertical feed system

Abstract

Manual surface grinder is a traditional machine tool product. It is suitable grinding for small and medium-sized abrasive, electronic components and various small parts, particularly suitable for small factories, family workshops. The manual surface grinder has a large application field. Along with our country machine equipments, car industry etc. profession of fast development, also along with our country automation technique of exaltation, automation factory also top a new of step, the PLC be one newly arisen of industry controller, with its physical volume small, the function be well-found, the price be cheap, credibility Gao Deng3, have a special advantage, at the everyone noodles realm acquire extensive of application.In the meantime, we process an equipments to the bearings, particularly is a Gao accuracy, high-efficiency, the Gao credibility of the bearings grinding machine's demand be very huge.Bearings, Be the foundation piece of machine industry, it process the importance of equipments very outstanding.

With the development of modern technology, machinery manufacturing industry is facing a high-speed, high precision and other new challenges, high-speed high precision feed system as the key to one of the CNC lathe.Machinebed, as the main supporting pieces of the bed is essential, and its structure will affect the performance of the machine performance. The rationality of its structure and performance of a direct impact on manufacturing cost CNC lathe; influence lathe parts and precision of the relative position between the work of all moving parts in relative motion trajectory accuracy. Stiffness of the feed system is low, large inertia, it is difficult to obtain high feed speed and high acceleration, high speed precision CNC lathe to improve positioning accuracy and driving accuracy, in addition to the design, select the feed system components, accurate calculation of its strength, stability And driving torque, but also the stiffness of the feed system

II

Abstract reasonably designed to reduce the loss of momentum caused by stiffness in order to ensure processing accuracy.

This text introduction the improvement design of M250 manual surface grinding machine work table horizontal feed system and vertical feed system The manual surface grinder generally adopts the screw. In order to improve machining accuracy of surface, my task is improving the feed system of M250 manual surface grinder, using the ball screw. And the grinder can finish manual feed and automatic feed. Horizontal feed system can achieve continuous alternate motion. Vertical feed system can achieve manual, intermittent and consecutive three methods of motion. And a micro feed system also is designed. The micro feed system can work through arc—contact worm by the lever control. The every switch of the lever can control the ball screw to move 0.1 mm. The machine can meet the greater range of processing.

Key words:manual surface grinder;horizontal feed system;vertical feed system;micro feed system;ball screw

III

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