三次元量床接觸式量測系統之評估方法

本研究提供一個三次元量床量測能力評估的方法論，結合部分因子設計實驗，並利用標準塊規以接觸式量測方式進行量測效能評估。本研究除檢驗量測系統分析(MSA) Gauge R&R的重複性與重現性，更進一步考慮一般量測系統之偏差、線性及穩定性，以確保系統量測的精度與準度。經由CMM長度量測五種量測特性的定義，選擇時間、受測工件塊規與操作人員爲實驗因子，反應變數爲塊規CMM量測值。考慮時間無法隨機化，以時間爲集區。以集區內實施分裂區塊設計實驗獲得塊規CMM量測值數據。實驗結果顯示，CMM的長度量測的準度與精度均極爲優越。可以接受CMM長度量測之穩定性、重現性、線性與偏差，其重複性極小，估計爲0.1(上標 *)10^(-7) inch^2。由此，可驗證本實驗之CMM已具備足夠的量測能力。且本研究採用的實驗分析與檢定方法，對於CMM使用者可提供建立一套具體可行的自行獨立檢校方法論，對提升企業能力深具實質上的意義與貢獻。

關鍵字

三次元量床；量測能力評估；分裂區塊設計

並列摘要

The purpose of this research is to present a method to evaluate the Coordinate Measuring Machine (CMM) measurement capability. The approach is based on contact measurement using block gauge and a factorialdesign technique. In this research, Repeatability and reproducibility are examined on a Gauge R&R, it address howprecise a measurement system is. Furthermore, In order to capture accuracy of the system, we tackle the characteristicsof bias, linearity and stability of the measurement system at the same time. According to the definition of lengthmeasurement by CMM, Time, block gauge and operator are the experimental factors and the response is the measuringvalue of block gauge by CMM. Because the time factor is not possible to randomize, so we use the time factor asblock. In each block, use split-plot design to obtain the measuring value of block gauge. The result of the experimentshowed that the accuracy and precision of length measure of CMM is remarkable. The bias, linearity, stability, andreproducibility of length measure of CMM can be accepted, repeatability estimation is extreme small, 0.1(superscript *) 10^(-7) inch^2. The CMM in this experiment possesses enough measurement capability. The experimental method and analyzingprocess provided a concrete and feasible methodology to construct the assessment capability for CMM users, it alsohad extensive meaning and contribution for improving enterprise's ability in practice.