已知参数：

Y向最大切削力：30000N     进给速度：3 ~ 4 0 0 0 MM／MIN   进给行程：3500MM

部件重量：50000N           最小设定单位：0.001MM/脉冲     定位精度：0.02MM

结构方面具体要求 半闭环控制形式 齿轮传动和滚珠丝杠传动部件 贴塑导轨 电机为FB25

摘要

在国际贸易中，很多发达国家把数控机床视为具有高技术附加值、高利润主要电机出口产品。世界贸易强国在进行国内机电产品贸易的同时，把高技术的机电产品出口打入国际市场，作为发展出口经济的重要战略措施，数控机床的技术水平高低及其在金属切削加工机床产量和总拥有量的百分比是衡量一个国家国民经济发展和工业制造整体水平的重要标志之一。数控铣床是数控机床的主要品种之一，它在数控机床中占有非常重要的位置。
本文介绍了铣床的一些基本概况，简述了机床主传动系统方面的原理和类型，分析了各种传动方案的机理。立式数控铣床主传动系统包括了主轴电动机、主轴传动系统和主轴组件三部分组成。本文详细介绍了立式数控铣床主传动系统的设计过程，该立式数控铣床主轴变速是靠带轮进行的，这种传动方式多见于数控车床，它可避免齿轮传动时引起的振动和噪声，是啮合传动中唯一一种不需要润滑的传动方式。在啮合传动中，它的结构最简单，制造最容易，最经济，弹性缓冲的能力最强，重量轻，两轴可以任意布置，噪声低。它的带由专业厂商生产，带轮自行设计制造，它在远距离、多轴传动时比较经济。文中介绍了立式数控铣床主传动系统各种传动方案优缺点的比较、主传动方案的选择和确定、主传动变速系统的设计计算、主轴组件的设计、轴承的选用及其润滑、关键零件的校核、以及主轴电动机的控制等设计过程。
关键词：机床；进给系统,滚珠丝杠；
Abstract
In international trade,many centuries view digital lathesare as hi-techvalue-adds and profitable exports.Digital lathesare expensive mechanical and electrical products.The powerful trade nations export hi-texh mechanical snd electrical products to the world market whiledoing such business at home ,Which is now an important strategy of develop-ing their export economy.
this text introduces the vertical CNC milling machine of some of the basic situation, this paper describes the main drive system of machine tool of principle and type, analyzes the mechanism of all kinds of transmission scheme. Vertical CNC milling machine main transmission system including the spindle motor, main shaft transmission system and spindle component of three parts. This paper introduces the vertical CNC milling machine main transmission system design process, the vertical axis CNC milling machine speed is to rely on the pulleys, the transmission way in numerical control lathe, it can avoid caused gear transmission of the vibration and noise, meshing transmission in the only need not lubrication transmission mode. In the meshing transmission, its structure is the most simple, make the most easy, the most economical, the most powerful of the elastic cushion, light weight, two axis can be arbitrary decorate, low noise. It brought from specialized manufacturer production, pulleys to design manufacturing, it in the distance, much shaft driving when more economic. This paper introduces the main transmission system vertical CNC milling machine all kinds of transmission scheme comparison, the advantages and disadvantages of the main transmission scheme selection and sure, main transmission variable speed drive system design calculation, spindle component design, the choice of bearing the lubrication, key parts of checking, and spindle motor control, such as design process.
Keyword：Machine tools; feed system, ball screw
目录
第一章  绪论 4
1.1  概述 4
1.2  龙门镗铣床组成特点 6
1.3  国内外的发展状况 8
1.3.1 我国数控车床的研究现状 8
1.3.2进给系统的发展现状 10
1.3.3数控机床的发展趋势 11
1.4  课题研究的内容 12
第二章  整体结构的设计 13
2.1  主轴系统的设计 13
2.2  进给系统的设计 14
2.2.1  进给系统的基本参数 14
2.2.2  丝杠设计计算 14
第三章  关键部件强度校核 24
3.1  轴承校核 24
3.2  齿轮校核 27
3.3  键的校核 27
第四章  总结 29
致谢 31
参考文献 33