Abstract

In recent years there is a growing trend on integrating Computer Aid Design (CAD), Computer Aid Manufacturing (CAM) and Computer Aided Inspection (CAI). This thesis presents a new shape adaptive motion control system that integrates part measurement with motion control. The proposed system consists of five blocks: surface measurement; surface reconstruction; tool trajectory planning; axis motion control and part alignment In this thesis, the key technology used in surface measurement and surface reconstruction is spatial spectral analysis. In the surface measurement block, a new special spectrum comparison method is proposed to find out an optimal digitizing frequency. In the surface reconstruction block, different interpolation methods are compared in the spatial spectral domain. A spatial spectral B-Spline method is presented. In the tool trajectory planning block, a method is developed to select the motion profile first and then determine the tool locations according to the reconstructed surface in order to improve the accuracy of the planned path. In the part alignment, a three-point alignment method is presented to align the part coordinates with the machine coordinates. Based on the proposed methods, a software package is developed and implemented on the polishing robot constructed at Ryerson University. The effectiveness of the proposed system has been demonstrated by the experiment on edge polishing. In this experiment, the shape of the part edges is measured first, and then constructed as a wire-frame CAD model, based on which tool trajectory is planned to control the tool to polish the edges.

Highlights

  • 1.1 M otivation of the StudyIn NC (Num erical Controlled) machining, the main trend is to integrate the Computer Aided Manufacturing (CAM) /Computer Aided Design (CAD)/CAI (Computer-Aided Manufacturing/ Computer-Aided Design/ Computer-Aided Inspection) techniques

  • It requires to cutting a stock to the desired shape according to the CAD model [1], After the stock is mounted on the NC machine, there will be a series o f operations including rough cutting, finish cutting and polishing

  • The sampling frequency of tl ; surface measurement is the key factor for these two blocks

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Summary

Introduction

In NC (Num erical Controlled) machining, the main trend is to integrate the CAM /CAD/CAI (Computer-Aided Manufacturing/ Computer-Aided Design/ Computer-Aided Inspection) techniques. It requires to cutting a stock to the desired shape according to the CAD model [1], After the stock is mounted on the NC machine, there will be a series o f operations including rough cutting, finish cutting and polishing. The general approach of CAI is off-line by using Coordinate measuring m achine (CMM). To overcome this problem, on-line surface measurement and inspection are required. On-line surface measurement and inspection are required It is especially important for the polishing process, as it may require checking or reconstructing the part

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