Trajectory error estimation for machining center cutter path due to motion error between interpolation segments

2023 Fiscal Year Final Research Report

• Project/Area Number: 21K03811
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Review Section: Basic Section 18020:Manufacturing and production engineering-related
• Research Institution: Kyushu Sangyo University
• Principal Investigator: Qiu Hua 九州産業大学, 理工学部, 教授 (40227335)
• Project Period (FY): 2021-04-01 – 2024-03-31
• Keywords: 機械エンジニアリング / 工作機械加工精度 / NC加減速制御 / 駆動軸位置サーボ制御 / 運動誤差解析モデル / 工具経路運動軌跡のシミュレーション方法 / 運動誤差の逆補正 / 実験検証

Outline of Final Research Achievements

From the machining center (MC) user’s point of view, this research proposes a practical approach to precisely simulate the trajectory motion error of a cutter path, consisting of linear or circular arc segments, produced by the NC acceleration/deceleration processing and position servo control of the used MC. In this approach, only two parameters are required and their values can be easily identified. The effectiveness of the approach has been demonstrated from the results of the verification experiments on an actual MC. As a result, it is possible to accurately estimate the motion error of the tool path from the parameters of the NC program without implementing an actual cutting experiment. Moreover, a reverse compensation to improve the cutter path motion accuracy is presented, in which only simple modification work to the NC program is necessary based on the cutter path simulation result. The feasibility of the method is also proved by the confirming experiments.

Free Research Field

機械工学

Academic Significance and Societal Importance of the Research Achievements

提案した工具経路運動軌跡の推定方法はアルゴリズムが明快で理解しやすい．その利用に当たっては，NCシステムの内部処理に関する専門的知識が必要なく，プログラミング作業も簡単にできる．したがって，単品・少量生産が多い金型部品の加工業者のようなMCの使用者にとっては，複雑な輪郭形状を加工する際に，要求する加工精度を達成できる最大効率加工パラメータの選定などの面に提案方法の利用が可能である．また，シミュレーション結果に基づく工具経路の逆補正方法を生産現場で利用すれば，送り速度を落とさずに輪郭加工精度の改善が期待できる．