「開窗特徵」為板形工件常見之設計元素，平面度誤差為板件功能的一項重要考量特性。本研究旨在建立開窗板件之平面度自動化量測系統，提出有效的擇點策略，在符合精度之條件下縮短量測時間、降低量測成本。在量測平台方面，本研究整合伺服馬達、線性傳動機構、光學線性編碼器，架構微動平台；並利用可程式邏輯控制器發展控制系統。在平面度檢測方面，根據Hammersley序列取樣原則，決定受測板件之平面度量測位置；然後，使用架設於平台上之線性位移計獲得量測位置之即時高度值；並應用以Excel VBA系統所開發之最小平方法程式完成平面度評估。本研究執行矩形與圓形兩組開窗件之實測案例，並與以先進數位掃描量測方法(ATOS)所得之分析結果進行量測評估驗證，本系統已達成平面度自動化量測之研究目的。
The “window” feature is a design element commonly to be used in plate parts, and the flatness error is an important characteristic considered as a function required. This study established an automatic measurement system for the flatness error evaluation of the window-type plate, to shorten the measurement time and reduce the measurement cost while meeting the precision requirements of the part. In the construction of the measurement platform, this study integrated servomotor, linear transmission components and optical linear encoder to construct the micro-motion platform, and used the programmable logic controller (PLC) to develop the control system. As to the measurement of the flatness error, the locations of the measuring points were first decided by Hammersley sequence. Next, using the linear displacement meter mounted on the platform derived the actual high of the measuring point in real time. Finally, applying the evaluating program developed in Excel VBA calculated the flatness error based on least squares method.Two practice cases with a rectangle window and a round window were conducted respectively, and the evaluated results had been compared with that of the advanced digital scanning measurement device (ATOS) did. The system developed in this study has achieved the goal of automatic measurement for flatness evaluation.
