數(shù)控機床進給系統(tǒng)熱誤差分析與試驗研究
發(fā)布時間：2018-09-12 09:24
【摘要】：隨著制造業(yè)向高速高精度加工方向發(fā)展,熱誤差對機床加工精度的影響日趨嚴重,因此減小熱誤差是提高機床加工精度的重要途徑。由于滑塊與導軌、軸承與絲杠以及螺母與絲杠之間的摩擦會產(chǎn)生大量熱量,因此進給系統(tǒng)作為數(shù)控機床上的主要熱源,由溫升所引起的熱誤差將降低機床進給運動的精度。本文以沈陽機床集團生產(chǎn)的VMC850E立式加工中心改造的試驗平臺上進給系統(tǒng)為研究對象,研究滾動直線導軌副和滾珠絲杠傳動系統(tǒng)的溫度場與熱變形,為減小進給系統(tǒng)的熱誤差提供依據(jù)。本文的主要研究工作如下:(1)在理論研究方面,通過對熱量傳遞的基本方式與定律、溫度場與熱變形基礎(chǔ)理論以及導熱微分方程等熱基礎(chǔ)理論的研究與分析后,確定出滾動直線導軌副和滾珠絲杠傳動系統(tǒng)發(fā)熱量以及熱對流換熱系數(shù)的計算方法和計算過程,為后續(xù)進給系統(tǒng)的溫度場與熱變形的有限元仿真分析提供依據(jù)。(2)建立滾動直線導軌副和滾珠絲杠傳動系統(tǒng)的有限元模型,將熱邊界條件加載在有限元模型上分別對其進行穩(wěn)態(tài)、瞬態(tài)溫度場分析以及熱—結(jié)構(gòu)耦合分析,獲得進給系統(tǒng)溫度場與熱變形的變化規(guī)律;通過仿真分析來研究影響滾動直線導軌副熱誤差的因素以及高速進給速度下滾珠絲杠傳動系統(tǒng)的溫度場與熱變形的變化規(guī)律,同時提出減小滾珠絲杠傳動系統(tǒng)熱誤差的有效方法。(3)依據(jù)試驗?zāi)康呐c性能要求,設(shè)計試驗平臺的整體結(jié)構(gòu)及試驗載荷加載機構(gòu),自主搭建滾珠絲杠傳動系統(tǒng)熱誤差研究試驗平臺。(4)對試驗平臺上進給系統(tǒng)進行溫度場與熱變形的試驗研究,將試驗得出的結(jié)果與熱誤差仿真分析的結(jié)果相比較,驗證采用有限元分析方法獲得的滾珠絲杠傳動系統(tǒng)溫度場及熱變形結(jié)果的正確性。
[Abstract]:With the development of manufacturing industry in the direction of high-speed and high-precision machining, the influence of thermal error on machining accuracy is becoming more and more serious. Therefore, reducing the thermal error is an important way to improve the machining accuracy of machine tools. Because the friction between slider and guide rail, bearing and lead screw and nut and lead screw will produce a lot of heat, feed system is the main heat source on NC machine tool, the thermal error caused by temperature rise will reduce the precision of machine tool feed motion. In this paper, the temperature field and thermal deformation of rolling linear guide rail pair and ball screw drive system are studied by taking the feed system on the test platform of VMC850E vertical machining center produced by Shenyang Machine tool Group as the research object. It provides the basis for reducing the thermal error of the feed system. The main research work of this paper is as follows: (1) in the theoretical research, through the research and analysis of the basic ways and laws of heat transfer, the basic theory of temperature field and thermal deformation, and the heat conduction differential equation, etc. The calculation method and calculation process of heat transfer coefficient and heat convection heat transfer coefficient of rolling linear guide rail pair and ball screw drive system are determined. It provides the basis for the finite element simulation analysis of the temperature field and thermal deformation of the following feed system. (2) the finite element model of the rolling linear guide rail pair and the ball screw transmission system is established, and the thermal boundary condition is loaded on the finite element model to carry on the steady state respectively. The transient temperature field analysis and thermal-structure coupling analysis are used to obtain the variation of the temperature field and thermal deformation of the feed system. Through simulation analysis, the factors that affect the thermal error of rolling linear guide rail pair and the variation law of temperature field and thermal deformation of ball screw drive system under high speed feed speed are studied. At the same time, an effective method to reduce the thermal error of the ball screw drive system is put forward. (3) according to the test purpose and performance requirement, the whole structure of the test platform and the loading mechanism of the test load are designed. The thermal error test platform of ball screw drive system is built independently. (4) the temperature field and thermal deformation of feed system on the test platform are studied, and the results obtained are compared with the results of thermal error simulation analysis. The results of temperature field and thermal deformation of ball screw drive system obtained by finite element method are verified.
【學位授予單位】：沈陽理工大學
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：TG659
本文編號：2238586
[Abstract]:With the development of manufacturing industry in the direction of high-speed and high-precision machining, the influence of thermal error on machining accuracy is becoming more and more serious. Therefore, reducing the thermal error is an important way to improve the machining accuracy of machine tools. Because the friction between slider and guide rail, bearing and lead screw and nut and lead screw will produce a lot of heat, feed system is the main heat source on NC machine tool, the thermal error caused by temperature rise will reduce the precision of machine tool feed motion. In this paper, the temperature field and thermal deformation of rolling linear guide rail pair and ball screw drive system are studied by taking the feed system on the test platform of VMC850E vertical machining center produced by Shenyang Machine tool Group as the research object. It provides the basis for reducing the thermal error of the feed system. The main research work of this paper is as follows: (1) in the theoretical research, through the research and analysis of the basic ways and laws of heat transfer, the basic theory of temperature field and thermal deformation, and the heat conduction differential equation, etc. The calculation method and calculation process of heat transfer coefficient and heat convection heat transfer coefficient of rolling linear guide rail pair and ball screw drive system are determined. It provides the basis for the finite element simulation analysis of the temperature field and thermal deformation of the following feed system. (2) the finite element model of the rolling linear guide rail pair and the ball screw transmission system is established, and the thermal boundary condition is loaded on the finite element model to carry on the steady state respectively. The transient temperature field analysis and thermal-structure coupling analysis are used to obtain the variation of the temperature field and thermal deformation of the feed system. Through simulation analysis, the factors that affect the thermal error of rolling linear guide rail pair and the variation law of temperature field and thermal deformation of ball screw drive system under high speed feed speed are studied. At the same time, an effective method to reduce the thermal error of the ball screw drive system is put forward. (3) according to the test purpose and performance requirement, the whole structure of the test platform and the loading mechanism of the test load are designed. The thermal error test platform of ball screw drive system is built independently. (4) the temperature field and thermal deformation of feed system on the test platform are studied, and the results obtained are compared with the results of thermal error simulation analysis. The results of temperature field and thermal deformation of ball screw drive system obtained by finite element method are verified.
【學位授予單位】：沈陽理工大學
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：TG659
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