姓名：王冲学号: 0802090534
学院: 机械工程学院专业: 机械设计制造及其自动化
题目:M250手动平面磨床工作台纵横向进给机
构改进设计
指导教师：孙丽英讲师
评阅者:硅胶模具制作
2012年6月
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。 机床及其它机械设备正向高速、高精度、高效率、大型化发展，对轴承等关键元件的要求亦随之提高。液体静压技术是保证轴承具有高精度、高效率、高承载、长寿命等优点的一门较新技术，已得到日益广泛的应用，并取得了可喜的成绩。 液体静压轴承依靠液压系统供给压力油，经过节流器，进入轴承的油腔，把轴浮在轴承中，保证了轴在任何状态下和一定的负载下都有轴承处于完全液体摩擦的状态.因而，在各种相对运动速度下，具有较高的承载能力；摩擦系数非常低，刚度高，回转精度高，精度保持性好，寿命长等特点.
静压主轴轴承系统的设计，本文选用了径向不等封油边向心静压轴承，平面环形推力轴承，缝隙节流器等作为主要设计对象，并对其原理进行阐述。通过改装设计，在费用不高的情况下，使设备克服了主轴的抱轴卡死现象，提高了机床的性能。
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。
烟焦油
混凝土表面增强剂关键词：手动平面磨床；横向进给；纵向进给；微量进给；滚珠丝杠
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 Lathe and other mechanical devices are developing to high speed, high accuracy, high efficiency, large scale, bearing and other essential part request enhanced. The static pressure technology precisely guarantees the bearing has the merits of high accuracy, high efficiency, high load bearing, long life and so on, this technology obtains widespread application day by day and obtains the encouraging result.
Hydraulic system supplies oil which has pressure to Liquid static pressure bearing, the oil stream current regulator, enters of the oil cavity the bearing, then the axis floats in the bearing. This had guaranteed the axis all has the bearing under any condition and certain load to be at the complete oil drag the condition. Thus, under each kind of relative motion speed, it has the characteristics as the h
igher bearing capacity, friction coefficient extremely low, rigidity high, rotation precision high, the precision maintenance acts charitably, the life is long and so on To the design of the static pressure main shaft bearing system, this article selected the radial direction not to wait to seal nearby the oil the centripetal static pressure bearing, the plane
ring-like thrust bearing, the slit current regulator and so on to be the main design objects, and carried on the elaboration to its principle. Through the re-equipment design, in the expense not high situation, caused the equipment to overcome deactivation phenomenon of the main axle, enhanced the engine bed performance 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;verticalfeed system;micro feed system;ball
screw
目录
摘要I
Abstract Ⅱ
第1章绪论 1
1.1 磨床概述 1
1.1.1磨床定义及其分类 1
1.1.2磨床的主要发展趋势2
1.2 平面磨床分类及其特点 2
1.2.1平面磨床分类及其特点 2
涂塑钢管连接1.2.2手动平面磨床的国内外发展状况 3 1.3 本次设计的主要内容 5
1.4 本章小结 6
第2章手动平面磨床的总体设计7
2.1 设计方案7
铝酸钙粉2.1.1设计方案一7
2.1.2设计方案二7
轨道根数2.1.3设计方案对比8
2.1.4设计改进8
2.2 进给系统的组成9
2.2.1机动进给装置9
2.2.2手动进给装置9
2.3 本章小结9
第3章进给机构设计计算 10
3.1 纵向进给机构的设计计算10
3.1.1切削力的计算10
3.1.2滚珠丝杠的设计与计算12
3.1.3轴承的选择16
3.1.4电动机的选择16
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