哈工大数控大作业完美版

第一作业调研报告 (1)

1.1调研内容 (1)

1.2工作量与要求 (1)

1.3正文 (1)

The development and application of NC machine tool servo system (2)

第二作业：典型曲线数字积分法插补方法 (13)

2.1目的 (13)

2.2要求 (13)

2.3 DDA法双曲线插补的积分表达式 (13)

2.4终点判别 (15)

2.5插补举例 (15)

第三作业：加工中心零件加工编程 (17)

3.1目的和要求 (17)

3.2数控机床设备 (17)

3.3加工工艺制订 (19)

3.4要完成的程序编写任务 (22)

《数控技术》课程（2015）

大作业

院（系）

专业

姓名

学号

班号

任课教师

完成日期

哈尔滨工业大学机电工程学院

2015年5月

数控大作业

第一作业调研报告

1.1调研内容

请以课堂所学习的知识为基础，自主选择课程中所涉及的任一知识点进行调研。可以调研知识点的发展脉络，也可以重点介绍该知识点的发展现状、争议与未来发展趋势。请提交交独一无二的报告

1.2工作量与要求

1. 报告需用英文撰写，可计算机打印，也可手写，但最后封面需手工签名。

2. 格式请参照本科生毕业论文要求（见教务处网站），总字数不少于2000字。

3.在调研报告的最后，请列出参考的主要文献（英文学术刊物上正式发表的文献不少于5篇）或网址，并在正文中标注引用。

4. 如果出现雷同，两位同学均无成绩。

1.3正文

The development and application of NC machine tool servo system Since the invention of NC machine tool in 1950s, servo system has been the indispensable component of the NC machine tool. With the rapid development of new materials, electronic power and controlling system, the servo system has evolved from the step-by-step system to DC system and then to AC system. As the blossom of AC servo technology, AC servo system will replace the DC system wholly and take up the dominant position in the family of servo system.

With the electronic power conversion unit as actuator and controller as c ore , Servo system which contains the servo driver and servo motor const itutes the main part of the electric-driving and automatic control system . When working, firstly the servo system will

receive the signal from NC devices, and then drive the motion of machine tool as well as ensure the accuracy and speediness of movement under the guidance of pulse command . Usually, precision and speed of t he NC machine tool and other technical indicators

mainly depend on the servo system itself

1.The improvement and assortment of NC servo system

At present, engineers tend to assess the quality by reference to several im portant indicators, such as precision, speed and so on. Therefore, a NC se rvo system must meet these requirements.

High precision

Unlike the traditional manufacturing which can be manually handled to r egulate and compensate errors, the NC servo system has a high demand o n positioning accuracy and repeated positioning accuracy

Quick repose characteristic

Quick response is one of important indicators of servo system’s dynamic quality which requires the servo system following the command signal with minimum error as well as quick repose and high stability. Once receiving the instruction of manipulator, the working machine can restore the original state of equilibrium quickly after a short regulation or a disturbance from outer space.

Wide speed range

Due to the difference in work piece materials, cutting tool and process requirements, servo system must have wide speed range, so as to ensure that the CNC machine in any circumstances can get the optimal cutting condition. Thus the machine tool can satisfy the requirement of high speed machining as well as the requirement of low speed feed.The speed range is generally larger than 1 to 10000. when the machine is working in a low cutting speed which ask for a larger stable torque