三维测头数据采集模板的设计1

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本科毕业设计论文

题目: 三维测头数据采集模板的设计

院 系: 机电工程学院 学科专业: 机械设计制造及其自动化

三维测头数据采集模板的设计

摘 要

CNC齿轮测量中心是我校与企业联合开发的精密测量仪器,利用坐标测量原理,可对多种类型的零件进行自动测量和精度评定。由于技术发展,三维测头和交流伺服电机应用于齿轮测量中心已成为主流。为了保持在此项目上的优势,现开展了在CNC齿轮测量中心上使用三维模拟测头的工作,本课题的内容就是为三维测头设计相应的数据采集模板。

本文是基于ISA总线的数据采集通道的设计。通过使用合适的译码电路来执行总线命令,将测头的模拟信号,经过所选的A/D转换器的转换,转换为计算机可以读取的数字信号,从而完成相应的测量任务。本文根据A/D转换器的时序,完成了应用电路的设计,并利用Protel99se软件绘制了整个数据采集通道的电路原理图和PCB图。本文结合CNC齿轮测量中心R轴、Z轴、T轴自上而下分布的结构,通过对所选的滚珠丝杠的刚度计算、所选电机的转动惯量的核算以及传动系统的刚度计算,完成了对CNC齿轮测量中心Z轴的设计。

本文设计的电路完成了三维模拟测头信号的采集。机械部分的布局及其刚度满足传动的要求。

关键词:CNC齿轮测量中心;A/D转换器;ISA总线;传动系统

I

Design of Data acquisition board for 3D probe

Abstract

CNC Gear Measuring Center is precision measurement instruments which invented by my university and business development, the use of coordinate measuring principle, can be a variety of types of parts for automatic measurement and accuracy assessment. As a result of technological development, three-dimensional measurement and ac servo motor used in the first gear measuring center has become the mainstream. In order to maintain the advantages of this project, now carried out the work of the use of three-dimensional simulation in CNC Gear Measurement Center Measuring, the contents of this issue is designing three-dimensional probe template corresponding data acquisition.

Data acquisition channels based on the ISA BUS was designed. The ISA BUS order was carried out by Decoding circuit. Under the control of ISA BUS order, Analog signals from Analogue gauge head will be converted into digital signal by A/D converter, and then the task of measuring was completed. A operating circuit of data acquisition board and a PCB was designed according to the conversion timing sequence of A/D converter by the Protel 99se software.The Z axis was designed by analyzing the structure of CNC gear survey center , choosig reasonable ballscrew pairs and electric motor and calculating the rigidity of system.

The collect of signal of 3D Analogue probe was operated exactly by the designed circuit. The layout of machine part and the rigidity of system satisfied to the requirement of Z axis of CNC gear survey center.

Key word: CNC Gear Measuring Center; A/D converter ;ISA BUS;drive system

II

目 录

中文摘要 .......................................... I 英文摘要 ......................................... II 主要符号表 ........................................ 1 1 绪论............................................ 1

1.1前言......................................................... 1 1.2 CNC齿轮测量测量中心国内外相关研究情况....................... 1 1.3课题的目的及意义............................................. 2 1.4课题研究的内容............................................... 3

2 硬件电路设计 ..................................... 4

2.1方案设计..................................................... 4 2.2电路设计....................................错误!未定义书签。 2.2.1 AD转换器选择.............................错误!未定义书签。

2.2.2数据缓冲器和寄存器的选择 ..............错误!未定义书签。 2.2.3参考电源的选择 ........................错误!未定义书签。 2.2.4晶振的选择 ............................错误!未定义书签。 2.2.5运放的选择 ............................错误!未定义书签。 2.2.6接口电路的设计 ........................错误!未定义书签。 2.2.7电路原理图 ............................错误!未定义书签。 2.3 PCB版图设计................................错误!未定义书签。

2.3.1电器规则检查(ERC) ...................错误!未定义书签。 2.3.2 生成网络表............................错误!未定义书签。 2.3.3 导入网络表............................错误!未定义书签。

3 CNC齿轮测量中心Z轴传动系统设计 ..... 错误!未定义书签。

3.2 CNC齿轮测量中心Z轴机械结构总体方案的确定错误!未定义书签。 3.2.1配重的计算 ............................错误!未定义书签。

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3.2.2传动系统的选定及计算 ..................错误!未定义书签。 3.2.3电机的选定及计算 ......................错误!未定义书签。 3.2.4导轨的选定 ............................错误!未定义书签。 3.3 Z轴机械结构图 ..........................错误!未定义书签。

结 论............................. 错误!未定义书签。 致 谢........................................... 29 参考文献 ......................................... 30 附录1??????????????????? 硬件电路原理图 附录2???????????????????????PCB版图 附录3??????????????????? 机械机构图

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