文档介绍：毕业设计论文
姓名: 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:
评阅者:
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,,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,,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
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, ponents 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 plete oil drag the condition. Thus, under each kind of relative motion speed, it has the characteristics as the higher bearing capacity, frict