在多種熱源的作用下，數(shù)控銑床產(chǎn)生熱變形，影響工件與刀具間的相對位移，造成加
工誤差，從而影響零件的加工精度，因此減小熱誤差對提高機(jī)床的加工精度至關(guān)重要?？刂茩C(jī)床熱誤差涉及到如何查找敏感點(diǎn)，然而找出機(jī)床敏感點(diǎn)是個非常棘手的問題。本文在對數(shù)控銑床熱邊界條件進(jìn)行分析的基礎(chǔ)上，應(yīng)用有限元分析軟件ANSYS，對ZK7640 數(shù)控銑床進(jìn)行整機(jī)熱特性分析，為機(jī)床敏感點(diǎn)的查找提供依據(jù)，對數(shù)控機(jī)床熱誤差進(jìn)行了定量計(jì)算，并通過實(shí)驗(yàn)檢測驗(yàn)證其正確性。
關(guān)鍵詞：溫度敏感點(diǎn)；熱誤差；有限元分析
Abstract: Many kinds of the heat sources in a CNC milling machine produce thermal deformation. This deformation affects the relative displacement between the work-piece and the cutter, causes the manufacturing errors, and influences the machining accuracy of the part. Therefore, it is very important to reduce thermal deformation to improve the machining accuracy. Controlling the thermal error will be relative to the theory of temperature sensitive point, however, it is difficult to find the points by experiments. In this paper, thermal characteristics of ZK7640 CNC milling machine are simulated by analyzing the thermal boundary conditions and using the finite element (FEM) software ANSYS. Moreover, many experiments are done to test the analysis' validity.
Key words: temperature sensitive point; thermal characteristics; FEM