車削加工過程中軸類工件頻響函數(shù)的快速預(yù)測
本文選題:頻響耦合子結(jié)構(gòu)法 + 柔性耦合; 參考:《機(jī)械工程學(xué)報(bào)》2017年15期
【摘要】:軸類工件在車削加工過程中由于材料去除,其動(dòng)力學(xué)特性會(huì)實(shí)時(shí)變化。快速準(zhǔn)確預(yù)測工件頻響函數(shù)是構(gòu)建車削穩(wěn)定性極限圖,防止車削顫振的關(guān)鍵環(huán)節(jié)。通過分析軸類工件連接界面的變形特性,發(fā)現(xiàn)剛性耦合條件下的頻響耦合子結(jié)構(gòu)法在預(yù)測軸類工件頻響函數(shù)時(shí)具有局限性。在此基礎(chǔ)上,考慮連接界面剛度影響因素,推導(dǎo)出連接界面剛度的計(jì)算方法,利用柔性耦合條件下的頻響耦合子結(jié)構(gòu)法建立了加工過程中軸類工件頻響函數(shù)求解快速預(yù)測模型。試驗(yàn)與理論分析結(jié)果表明:柔性耦合模型能夠快速準(zhǔn)確地預(yù)測軸類工件隨材料去除時(shí)的頻響函數(shù)變化;與剛性耦合模型相比,柔性耦合模型對(duì)頻響函數(shù)預(yù)測的準(zhǔn)確性受工件尺寸變化影響較小,模型應(yīng)用范圍更廣。
[Abstract]:The dynamic characteristics of shaft workpieces will change in real time due to material removal during turning. Fast and accurate prediction of workpiece frequency response function is the key link to construct turning stability limit diagram and prevent turning chatter. By analyzing the deformation characteristics of the shaft workpiece interface, it is found that the frequency response coupling substructure method under rigid coupling condition has limitations in predicting the axial workpiece frequency response function. On this basis, considering the influence factors of connection interface stiffness, the calculation method of connection interface stiffness is deduced, and the fast prediction model of shaft workpiece frequency response function in machining process is established by using frequency response coupling substructure method under flexible coupling condition. The experimental and theoretical results show that the flexible coupling model can quickly and accurately predict the change of frequency response function of axial workpieces with material removal, and compare with the rigid coupling model. The accuracy of the flexible coupling model for the prediction of the frequency response function is less affected by the change of the workpiece size, and the model is applied more widely.
【作者單位】: 西安交通大學(xué)機(jī)械制造系統(tǒng)工程國家重點(diǎn)實(shí)驗(yàn)室;
【基金】:國家自然科學(xué)基金重點(diǎn)(51235009) 陜西省自然科學(xué)基礎(chǔ)研究計(jì)劃(2015JQ5126)資助項(xiàng)目
【分類號(hào)】:TG51
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