哈尔滨工业大学数控技术大作业

《数控技术》课程（2014）

大作业

院（系）

专业机械设计制造及其自动化

姓名

学号

班号

任课教师韩振宇

完成日期2014.4

哈尔滨工业大学机电工程学院

2014年3月

说明

一、大作业应包括下列主要内容：

1.目录；

2.题目1的要求（精简版）与报告；

3.题目2的要求（精简版）与报告；

4.题目3的要求（精简版）与报告；

5.其他内容

二、注意事项：

1. 报告可以打印，也可以手写，手写的请扫描后粘贴入word文件中，

形成电子文档；

2. 调研部分，不要为了凑字数，而撰写大量无关内容。字数不重要，重

要的是对调研内容的自我总结；

3. 在大作业的最后，如果愿意，可以谈一下对课程的感受和建议；

4. 报告的电子版请以班级为单位，刻录在光盘中交给任课教师。

三、报告请用A4纸双面打印，左侧装订，统一交给任课教师，以备检查。

四、此说明页请勿删除。

目录

作业一 (2)

作业二 (8)

作业三 (12)

作业一：CNC Applications CNC Applications Introduction

The many unique features of a PCNC create a versatility that allows it to be used in a wide range of applications. Below are some of the instances that illustrate how the unique value and features of the machine can have a substantial impact on the cost or success of an application.

Engineering Prototype, Research and Development

Too often engineers find themselves squeezed between the R&D department and the production machine shop. Here's a typical scenario: In a CNC machine shop with high speed machining centers, the shop runs efficiently: the expensive machinery is kept busy with a well-planned job queue of production parts. Materials, machine time, tooling, jigs, fixtures, and all the rest have been carefully synchronized for continuous flow and high productivity. In the middle of it all, a wild-eyed R&D engineer shows up with a poorly documented sketch; he wants the part on his desk the next morning. Production schedules snarl with development schedules. Cost accounting is fudged, and then some people wonder why the productivity of the machine shop seems to be dropping. Sales people wonder why the new developments take so long. It's all very Dilbert.

Personal CNC offers an alternative. Its low cost makes it perfectly suited to one-off designs. A PCNC allows engineering departments to keep a machine "at the ready", dedicated solely to R&D work. There are many benefits to this approach. The prototype turn-around time is quicker, the product designers gain a clearer understanding of the manufacturing process, and consequently the final design is easier to manufacture when the production model shows up in the job queue of the production machine shop. Development with the use of a PCNC is more efficient, and allows a clear separation of the cost accounting of the daily conventional manufacturing processes from the costs of development.

Secondary Operations

Expensive production machines can support their high cost only when they are kept occupied in high value processes. A PCNC would not normally be considered a production machine tool, however, when it is judiciously