應用於多軸工具機的幾何誤差量測方法

專利類型

發明

專利國別 (專利申請國家)

中華民國

專利申請案號

107147863

專利證號

I 684238

專利獲證名稱

應用於多軸工具機的幾何誤差量測方法

專利所屬機關 (申請機關)

國立中正大學

獲證日期

2020/05/21

技術說明

本發明為一種幾何誤差量測方法，可提供多軸工具機(包含至少一旋轉軸)使用。幾何誤差量測方法包含：提供一偵測元件、提供至少三顆標準校正球，以至少一旋轉軸驅動至少三顆標準校正球轉動，以偵測元件量測個標準校正球隻依實際測量位置，透過一座表準轉換矩陣，計算個標準校正球之實際量測位置與一定義平面位置之差值，以及透過一階泰勒展開式展開此差值，並以最小平方法進行計算，求得對應至少一旋轉軸之幾何誤差。藉此得以簡易方式準確測得旋轉軸之幾何誤差。 For the machining accuracy of five-axis machine tools, it must be emphasized that not only the PIGEs but also the PDGEs of rotary axes influence the machining accuracy. However, until now there is no any commercial measurement system available for identifying the PDGEs in the rotary axes of five-axis machine tools. As a result, this study proposes a robust, efficient and automatic measurement method to identify and compensate the position-dependent geometric errors (PDGEs) of rotary axes on five-axis machine tools. The proposed measurement method has established an on-machine measurement for the PDGEs of rotary axes by using a touch-trigger probe and three spheres installed on the spindle as well as the tilting rotary table, respectively. For each rotary axis, only a single measuring pattern is implemented to measure the PDGEs with a single setup, which delineates the advantages of efficient and automated identifying procedures in each periodical measurement. By implementing the proposed measurement method, 12 PDGEs can be numerically identified based on the measurement algorithm, which is built through a kinematic error model as well as a least square method. Finally, the proposed measurement method is experimentally conducted on a commercial five-axis machine tool. Moreover, after consequently performing the proposed measurement method, the PDGEs of the rotary axes were quantitatively compensated by the commercial controller to validate its feasibility. The experimental results have clearly delineated that the linear errors and angular errors are reduced from at most 37.81 μm and 10.23 mdeg to 0.9 μm and 0.26 mdeg, respectively. Consequently, the experimental results have demonstrated that the proposed measurement method is efficient and precise.

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