三坐标测量机误差补偿.ppt

Fixtures Reconfigurable Fixtures Fixtures Dedicated Fixtures Mainly for free-form shapes Error Compensation and Application Considerations Some Concepts Sources of Uncertainty Error Compensation Acceptance Re-verification Tests Temperature Control Fixtures System Integration System Integration CAD/CAM/CAI Integration System Integration Measuring Equipment Options System Integration Flexible Inspection Systems System Integration Flexible Inspection Systems * Prof. Dr. Liandong Yu Prof. Dr. Weishi Li HEFEI UNIVERSITY OF TECHNOLOGY FUNDAMENTALS OF COORDINATE MEASURING TECHNOLOGY Contents Chap. 1 Evolution of Dimensional Measurement Chap. 2 Fundamentals of CMMs Chap. 3 Probe Systems Chap. 4 CMM Software Chap. 5 Error Compensation Application Considerations Chap. 6 Non-Cartesian CMMs Error Compensation and Application Considerations Some Concepts Sources of Uncertainty Error Compensation Acceptance Re-verification Tests Temperature Control Fixtures System Integration Error Compensation and Application Considerations Some Concepts Sources of Uncertainty Error Compensation Acceptance Re-verification Tests Temperature Control Fixtures System Integration Some Concepts Uncertainty Measuring uncertainty is a calculated estimate of how much a measured result may vary from the true value, based on factors such as operator influence, as well as the environmental conditions in which the instrument is used. Repeatability Repeatability is the variation in measurements obtained with one measurement instrument when used several times by an appraiser while measuring the identical characteristic on the same part. It is a component of uncertainty, but in many cases a fairly small component. Some Concepts Bias Bias is the difference between the observed average of measurement and the reference value. It is the systematic error that is an indication of a measuring instrument. The reference value is determined by averaging several measurements using standard measuring