本文選題：多軸數(shù)控機床　切入點：在機測量　出處：《機械工程學(xué)報》2017年20期

【摘要】：多軸數(shù)控機床的在機測量會存在冗余運動自由度,由此導(dǎo)致一個測量任務(wù)會有多個與之對應(yīng)的伺服運動方案,而確定最優(yōu)的伺服運動方案,是保證在機測量性能的前提。針對這一問題,提出一種基于機床功能且面向測量任務(wù)的在機測量運動方案創(chuàng)成方法:采用多體系統(tǒng)理論及齊次坐標(biāo)變換方法對被測對象的幾何特征及數(shù)控機床的運動形式進行數(shù)學(xué)解析;建立以被測幾何特征為自變量、以機床伺服運動為因變量的函數(shù)方程;求解該方程獲得所有可能的測量運動方案。在此基礎(chǔ)上,通過分析方程解的取值范圍,驗證所有測量運動方案的功能;考慮到數(shù)控機床的結(jié)構(gòu)及伺服特性對測量精度的影響,提出了測量方案性能評價準(zhǔn)則,并據(jù)此確定最優(yōu)的測量方案。在某數(shù)控成形砂輪磨齒機上進行了齒形偏差的在機測量,試驗結(jié)果驗證了該方法的有效性和可行性。利用該方法確定的最優(yōu)在機測量方案測量精度高、重復(fù)性好。
[Abstract]:There will be redundant motion degrees of freedom in the measurement of multi-axis NC machine tools, which leads to the existence of multiple servo motion schemes corresponding to a single measurement task, and the determination of the optimal servo motion scheme is the prerequisite to ensure the performance of in-machine measurement.In response to this problem,Based on the function of machine tool and oriented to measurement task, this paper presents a method of generating motion scheme for in-machine measurement. The geometric characteristics of the object under test and the motion form of NC machine tool are analyzed by using the theory of multi-body system and the method of homogeneous coordinate transformation.A function equation with geometric characteristics of measured as independent variable and servo motion of machine tool as dependent variable is established, and all possible measurement schemes are obtained by solving the equation.On this basis, the function of all measurement schemes is verified by analyzing the range of the solution of the equation, and considering the influence of the structure and servo characteristics of the NC machine tools on the measurement accuracy, the performance evaluation criteria of the measurement schemes are proposed.Based on this, the optimal measurement scheme is determined.The in-situ measurement of tooth profile deviation is carried out on a CNC grinding wheel grinding machine. The experimental results show that the method is effective and feasible.The optimal in-machine measurement scheme determined by this method has high measurement accuracy and good repeatability.
【作者單位】： 西安理工大學(xué)機械與精密儀器工程學(xué)院;
【基金】：國家自然科學(xué)基金(51375382) 陜西省教育廳產(chǎn)業(yè)化培育(2013JC27) 西安理工大學(xué)博士創(chuàng)新基金(207-002j02)資助項目
【分類號】：TG659

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本文編號：1719159