基于PH曲線五軸數(shù)控插補策略的研究
發(fā)布時間：2018-10-18 15:35
【摘要】：科學知識的不斷融合和制造市場競爭的日趨激烈,對機械制造的加工精度和效率提出了更高的要求。代表制造水平的數(shù)控技術正向著高速、高精和多軸加工方向發(fā)展。五軸加工技術能夠一次性加工比較復雜的自由曲面零件,正逐漸取代傳統(tǒng)的三軸加工。在對自由曲面進行加工時,通常采用微段直線逼近加工曲線的方法。這種方法導致了龐大的數(shù)控加工程序,使得存儲和傳輸?shù)呢摵煞浅４?并且速度不連續(xù)降低了加工質量。樣條曲線插補可以降低數(shù)控程序數(shù)量,降低速度波動,從而提高表面加工質量。PH曲線是一種擁有許多優(yōu)良特性的多項式曲線。它擁有能夠精確計算的弧長和精確表示的等距線,并且保持了與Bezier曲線的完全一致性。因此本文針對PH曲線在五軸數(shù)控系統(tǒng)中的插補策略進行研究。本文首先在Farouki的CC(cubic-cubic)準則插值算法的基礎上提出了數(shù)據(jù)點消去的逼近算法,減少傳統(tǒng)算法的計算量以提高效率。其次,提出以弧長為參數(shù)的加減速控制策略,縮短機床低速定位時間和降低機床沖擊;對CAM軟件生成的CLS文件進行后置處理,生成空間五次PH曲線并用于五軸數(shù)控插補的算法。最后,設定五軸數(shù)控插補中PH曲線的插補G指令以及處理機制,通過PH曲線樣條插補算法和曲面加工仿真驗證了理論的正確性和可行性。
[Abstract]:With the continuous integration of scientific knowledge and the increasingly fierce competition in the manufacturing market, higher requirements for machining accuracy and efficiency have been put forward. NC technology, which represents manufacturing level, is developing towards high speed, high precision and multi-axis machining. Five-axis machining technology can process complex free-form parts in one-time, which is gradually replacing the traditional three-axis machining. When machining free-form surfaces, micro-segment straight lines are usually used to approximate the machining curves. This method leads to a large number of NC machining programs, which makes the load of storage and transmission very large, and the speed discontinuity reduces the machining quality. Spline curve interpolation can reduce the number of NC programs, reduce the fluctuation of speed, and improve the quality of surface machining. PH curve is a polynomial curve with many excellent characteristics. It has an exact arc length and an exact representation of the isometric line, and maintains the complete agreement with the Bezier curve. Therefore, the interpolation strategy of PH curve in five-axis NC system is studied in this paper. In this paper, based on Farouki's CC (cubic-cubic) criterion interpolation algorithm, a data point elimination approximation algorithm is proposed to reduce the computational complexity of the traditional algorithm to improve the efficiency. Secondly, an acceleration and deceleration control strategy with arc length as a parameter is proposed to shorten the low speed positioning time and reduce the impact of machine tools, and to post process the CLS files generated by CAM software to generate the PH curve of five times space and to be used in the five-axis NC interpolation algorithm. Finally, the G instruction and processing mechanism of PH curve interpolation are set up in five-axis NC interpolation. The correctness and feasibility of the theory are verified by PH curve spline interpolation algorithm and surface machining simulation.
【學位授予單位】：遼寧科技大學
【學位級別】：碩士
【學位授予年份】：2015
【分類號】：TG659
本文編號：2279565
[Abstract]:With the continuous integration of scientific knowledge and the increasingly fierce competition in the manufacturing market, higher requirements for machining accuracy and efficiency have been put forward. NC technology, which represents manufacturing level, is developing towards high speed, high precision and multi-axis machining. Five-axis machining technology can process complex free-form parts in one-time, which is gradually replacing the traditional three-axis machining. When machining free-form surfaces, micro-segment straight lines are usually used to approximate the machining curves. This method leads to a large number of NC machining programs, which makes the load of storage and transmission very large, and the speed discontinuity reduces the machining quality. Spline curve interpolation can reduce the number of NC programs, reduce the fluctuation of speed, and improve the quality of surface machining. PH curve is a polynomial curve with many excellent characteristics. It has an exact arc length and an exact representation of the isometric line, and maintains the complete agreement with the Bezier curve. Therefore, the interpolation strategy of PH curve in five-axis NC system is studied in this paper. In this paper, based on Farouki's CC (cubic-cubic) criterion interpolation algorithm, a data point elimination approximation algorithm is proposed to reduce the computational complexity of the traditional algorithm to improve the efficiency. Secondly, an acceleration and deceleration control strategy with arc length as a parameter is proposed to shorten the low speed positioning time and reduce the impact of machine tools, and to post process the CLS files generated by CAM software to generate the PH curve of five times space and to be used in the five-axis NC interpolation algorithm. Finally, the G instruction and processing mechanism of PH curve interpolation are set up in five-axis NC interpolation. The correctness and feasibility of the theory are verified by PH curve spline interpolation algorithm and surface machining simulation.
【學位授予單位】：遼寧科技大學
【學位級別】：碩士
【學位授予年份】：2015
【分類號】：TG659
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，本文編號：2279565
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