發(fā)布時(shí)間：2018-06-01 05:28

  本文選題：多軸數(shù)控機(jī)床 + 虛擬裝配��； 參考：《哈爾濱工業(yè)大學(xué)》2015年碩士論文

【摘要】：多軸數(shù)控機(jī)床結(jié)構(gòu)復(fù)雜、形式多樣、運(yùn)動(dòng)靈活,在加工過(guò)程中容易產(chǎn)生碰撞問(wèn)題。多軸數(shù)控機(jī)床的碰撞問(wèn)題難以依靠人工進(jìn)行預(yù)防,是多軸數(shù)控加工中亟需解決的問(wèn)題。基于計(jì)算機(jī)圖形技術(shù),本文提出了針對(duì)任意形式的多軸數(shù)控機(jī)床的離線干涉檢查方法及實(shí)時(shí)防碰撞策略。本文介紹了以組件-模型結(jié)構(gòu)為基礎(chǔ)的虛擬數(shù)控機(jī)床構(gòu)建方法,并結(jié)合數(shù)控機(jī)床剛體特性選擇了STL等實(shí)體網(wǎng)格模型作為仿真模型,同時(shí)給出了程序設(shè)計(jì)方法。在此基礎(chǔ)上對(duì)機(jī)床坐標(biāo)系和工件坐標(biāo)系下的運(yùn)動(dòng)進(jìn)行了運(yùn)動(dòng)學(xué)模型分析,明確虛擬數(shù)控機(jī)床運(yùn)動(dòng)鏈上各個(gè)組件及模型位置的計(jì)算方法,并介紹了實(shí)現(xiàn)運(yùn)動(dòng)仿真的關(guān)鍵技術(shù)。干涉檢查是本文研究的重點(diǎn),在離線干涉檢查部分注重研究準(zhǔn)確高效的干涉檢查的算法,在分析數(shù)控機(jī)床運(yùn)動(dòng)特性及各種干涉檢查方法的基礎(chǔ)上,最終選取以O(shè)BB為包圍體的層次包圍樹方法對(duì)實(shí)體模型處理,并對(duì)此方法進(jìn)行優(yōu)化,提出更高效的局部更新層次包圍樹的算法,同時(shí)以模型間三角面片相交作為干涉的判斷標(biāo)準(zhǔn),保證干涉檢查的精度與建模精度一致。而在實(shí)時(shí)防碰撞部分則注重干涉檢查策略的研究,針對(duì)數(shù)控機(jī)床運(yùn)行于自動(dòng)模式時(shí)的特點(diǎn),本文提出了采用兩套緩存區(qū)的防碰撞策略,通過(guò)干涉檢查的安全代碼才能夠驅(qū)動(dòng)數(shù)控機(jī)床運(yùn)動(dòng)。針對(duì)手動(dòng)模式下的特點(diǎn),本文提出了在運(yùn)動(dòng)方向上進(jìn)行后臺(tái)預(yù)檢測(cè)的策略,提前檢測(cè)出行程范圍內(nèi)的潛在碰撞位置并做出反應(yīng)�；诒疚牡乃惴安呗�,作者開發(fā)了防碰撞系統(tǒng)并進(jìn)行了離線干涉檢查及實(shí)時(shí)防碰撞實(shí)驗(yàn),實(shí)驗(yàn)結(jié)果驗(yàn)證了本文方法的正確性及可行性。
[Abstract]:Multi-axis NC machine has complex structure, various forms and flexible motion, so it is easy to collide in the process of machining. The collision problem of multi-axis NC machine tools is difficult to be prevented manually, which is an urgent problem to be solved in multi-axis NC machining. Based on the computer graphics technology, this paper presents an off-line interference inspection method and a real-time anti-collision strategy for arbitrary multi-axis NC machine tools. This paper introduces the construction method of virtual NC machine tool based on component-model structure, and selects STL and other entity mesh model as simulation model combined with the rigid body characteristics of NC machine tool, and gives the programming method at the same time. On this basis, the kinematics model of the machine tool coordinate system and the workpiece coordinate system is analyzed, the calculation method of each component and model position on the motion chain of the virtual NC machine tool is clarified, and the key technology to realize the motion simulation is introduced. Interference detection is the focus of this paper. In the part of off-line interference inspection, we focus on the research of accurate and efficient algorithms for interference detection. On the basis of analyzing the motion characteristics of NC machine tools and various methods of interference detection, Finally, the hierarchical bounding tree method with OBB as the bounding body is selected to deal with the solid model, and the method is optimized, and a more efficient algorithm for updating the hierarchical bounding tree is proposed. At the same time, the intersection of triangular patches between the models is taken as the criterion of interference. The accuracy of interference detection is consistent with that of modeling. In the real time anti-collision part, we focus on the research of interference inspection strategy. In view of the characteristics of NC machine tool running in automatic mode, this paper proposes two sets of anti-collision strategy of buffer area. The safety code of interference check can drive the movement of NC machine tool. In view of the characteristics of manual mode, this paper proposes a strategy of background pre-detection in the direction of motion, which can detect the potential collision position in the travel range in advance and respond to it. Based on the algorithm and strategy of this paper, the anti-collision system is developed and the off-line interference inspection and real-time anti-collision experiment are carried out. The experimental results verify the correctness and feasibility of this method.
【學(xué)位授予單位】：哈爾濱工業(yè)大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：TG659

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1 汪全友;;數(shù)控機(jī)床各級(jí)坐標(biāo)系的設(shè)定原理及相互關(guān)系分析[J];中國(guó)現(xiàn)代教育裝備;2013年09期

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本文編號(hào)：1963017