Abstract 3-4
Abstract 4-5
Chapter 1 Introduction 9- 15
1. 1 Introduction 9
1.2 surface measurement method 9- 1 1
1.3 research status at home and abroad 1 1- 13
1.3. 1 Research status of surface measurement of known CAD models 1 1
1.3.2 Research Status of Surface Measurement of Unknown CAD Models 1 1- 12
1.3.3 Research Status of Measurement Simulation 12- 13
1.4 project background and main research contents 13- 15
1.4. 1 topic background 13- 14
1.4.2 The main research content of this paper is 14- 15.
Chapter 2 Research on CMM Measuring Surface Technology 15-27
2. 1 Introduction 15
2.2 CMM measurement software 15- 16
2.3 CMM measurement method of curved surface 16- 19
2.3. 1 point trigger type 16- 17
2.3.2 continuous scanning type 17- 18
2.3.3 programming mode 18- 19
2.4 curved surface measurement path planning 19-23
2.4. 1 design principle of measuring path 19-2 1
2.4.2 Path planning strategy for surface survey 2 1-23
2.5 probe radius compensation 23-25
2.6 Measurement Error Assessment 25-26
2.6. 1 measurement error evaluation under point measurement 25-26
2.6.2 Measurement error evaluation under scanning measurement 26
2.7 Overview of this chapter 26-27
Chapter III Error Analysis and Reduction Methods of CMM Measuring Surface 27-47
3. 1 Introduction 27
3.2 Influence of Machine Error on Measurement Error 27-33
Static Error 27-30
Dynamic error 30
3.2.3 Machine Error Compensation 30-33
3.3 Influence of establishing workpiece coordinate system on measurement error 33-38
3.3. 1 Error reason of establishing workpiece coordinate system 34
3.3.2 Common Methods of Establishing Workpiece Coordinate System 34-36
3.3.3 Comparison of measurement errors under different methods 36-37
3.3.4 Method of Reducing the Error of Establishing Workpiece Coordinate System 37-38
3.4 Influence of Surveying Planning on Surveying Error 38-42
3.4. 1 Plan the measurement path along the normal vector 39.
3.4.2 Finding measuring point vectors through mathematical models 39-42
3.5 Influence of probe radius compensation on measurement error 42-44
3.5. 1 probe selection 42-43
3.5.2 probe radius compensation error 43-44
3.6 Influence of operation level of surveyors on measurement error 44-46
3.6. 1 manual measurement error 44
3.6.2 Automatic measurement of three coordinates 44-46
3.7 Section 46-47 of this chapter
Chapter 4 Surface measurement and simulation of known CAD models 47-7 1
4. 1 Introduction 47
4.2 Three-plane Method and Least Square Method to Establish Workpiece Coordinate System 47-52
4.2. 1 Workpiece Coordinate System Establishment Process 47-49
4.2.2 Establishment of workpiece coordinate system in blade inspection 49-52
4.3 Adaptive Distribution of Measuring Points 52-57
4.3. 1 Determination of measuring points 52-54
4.3.2 Adaptive Distribution of Measuring Points by Curvature Difference Method 54-56
4.3.3 Self-adaptive distribution of measuring points by straight line included angle method 56-57
4.4 Path Planning and Radius Compensation along Vector Direction 57-59
4.4. 1 Planning the measurement path along the vector direction 58
4.4.2 Compensate the probe radius 58-59 along the vector direction.
4.5 Measurement Simulation 59-70
4.5. 1 simulation method research 60
4.5.2 Least Square Method to Realize the Transformation of Initial Coordinate System 60-62
4.5.3 Realization of adaptive distribution of measuring points 62-65
4.5.4 Simulation test of measuring path 65-66
4.5.5 Setting of obstacle avoidance points 66-67
4.5.6 67th-68th generation of DMIS scheme
Three coordinate measurement data reading 68-69
4.5.8 Evaluation of Measurement Error
4.6 Overview of this chapter 70-7 1