On the Development of CMM Inspection Technology for Parts without Regular Features

三次元量床於自由曲面檢測技術發展

賴景義(Jiing-Yih Lai) ； 陳國仁(Kuo-Jen Chen)

《中國機械工程學刊》 28卷4期 (2007/08) Pp. 385-396

https://doi.org/10.29979/JCSME.200708.0004

摘要

許多工業產品僅有自由曲面造型的設計，而有些工件雖然具有標準的幾何特徵，可是往往由於加工中的變形，導致於無法做為座標系統設定的基準。本研究主要針對此類的工件，提供一整合性的流程，應用於三次元量床檢測，主要包括三項技術：疊代座標定位、量測路徑規劃與誤差分析。在疊代座標定位中，提供一種組合粗定位與精定位的演算法，使得工件座標非常靠近CAD模型座標。而在量測路徑規劃中，本研究發展出一套規劃量測路徑系統來規劃量測路徑。且在誤差分析中分成三個部分來討論：點對點誤差分析、不含座標定位的點對CAD模型誤差分析，與含座標定位的點對CAD模型誤差分析。本研究最後使用標準球與塊規來驗證疊代座標定位之精度，並以高爾夫球頭檢測為範例，說明上述各項技術之應用情況。

並列摘要

Many industrial parts are designed with freeform features only. Some may have regular features, but their shape may deform during the manufacturing process, resulting in no feature to act as the datum for inspection. The objective of this study is to propose an integrated approach for three-dimensional inspection of such products. The proposed approach mainly includes three phases, iterative part localization, measurement path planning and error comparison. A rough positioning stage and a fine positioning stage are combined to establish the part coordinate, which is as close to the model coordinate as possible. A path planning system is then developed to plan the measurement path based on the CAD model. The error comparison includes: point-to-point comparison, point-to-CAD comparison without alignment and with alignment. A standard sphere and a gauge block are used for the verification of the proposed part localization. A golf head example is presented also to demonstrate the integrated process of the proposed approach.

並列關鍵字

CMM inspection ； localization ； error comparison