涡旋盘高速精密铣削切削热理论分析及数值模拟
发布时间：2018-08-04 10:11
【摘要】：涡旋压缩机是一种发展迅速的高效容积式流体机械,目前对其核心部件涡旋盘的特性研究越来越深入。其中,高速切削加工过程中热变形的产生是影响涡旋盘加工精度和质量的主要原因。文章主要是以组合型线涡旋盘的高速精密铣削加工过程中的切削热问题为研究对象,主要工作内容如下:1.组合型线的涡旋盘数控铣削加工。选用数值逼近的方法加工涡旋盘,先采用粗加工的加工策略,然后在粗加工的基础上采用精加工方式获取几何尺寸、形状精度及表面质量符合要求的工件。2.任意时刻和位置处的温度变化情况分析。采用单一变量的方法,模拟了y值一定时,x=z=20mm处不同的热源热量引起温度随时间的变化规律,呈现先增高后降低的趋势,20s时温度达到最大值,此时温差最大为208℃,随着时间的增加,温差逐渐减小,直至为零;t=20s时刻,不同z值的情况下,温度随着x值的变化规律,基本上在x=0.06m位置处,温度基本趋于室温。3.三个变形区热源热量的理论分析和数值计算。涡旋盘与刀具之间的摩擦切削热主要是来自于剪切区和刀-件摩擦区,研究了这两个变形区产生的热量对涡旋盘的影响。剪切区热量比例分配系数R1和刀-件摩擦区产生的热量比例分配系数R3都随着主轴转速的提高而增加,主轴转速越高,传入工件的热量越少。4.剪切温度和应变-应力的变化规律及实际铣削加工过程中温度-时间变化情况。随着切削速度v的增加,剪切应变率?(5)每升高213/s,剪切应力s?大约增加20MPa,剪切温度一直呈现上升趋势,当主轴转速达到7000r/min时,此时涡旋盘温升缓慢,切削温度基本保持在754℃左右。在实际铣削加工涡旋盘时,低速加工阶段温度值稳定后基本保持103℃左右,高速精加工阶段初始时刻温度值已达到570℃以上,随着时间的变化,温度值逐渐趋于750℃左右。通过对涡旋盘的高速精密铣削加工过程,切削热问题的研究并与实际铣削加工过程中的温度进行比较,具有很好地一致性,这对于减少涡旋盘温升,减少热变形,提高其加工质量和精度具有指导意义,也为变截面涡旋型线的高速精密加工切削热问题提供了参考价值。
[Abstract]:Scroll compressor is a kind of high efficiency displacement fluid machine with rapid development. At present, the characteristics of vortex disk, its core component, are studied more and more deeply. The thermal deformation in high speed cutting is the main reason that affects the machining precision and quality of scroll disk. In this paper, the problem of cutting heat in the high speed and precision milling process of the combined line vortex disk is studied. The main work is as follows: 1. Numerical Control Milling of Scroll disk of combined profile. The method of numerical approximation is used to process the scroll disk. Firstly, rough machining strategy is adopted, and then the geometric dimension, shape precision and surface quality of workpiece. 2 are obtained by finishing on the basis of rough machining. Analysis of temperature variation at any time and position. By using the method of single variable, the variation of temperature with time caused by different heat sources at a certain y value of 20mm is simulated. The temperature increases first and then decreases to the maximum at 20 s, and the maximum temperature difference is 208 鈩，
本文编号：2163566
[Abstract]:Scroll compressor is a kind of high efficiency displacement fluid machine with rapid development. At present, the characteristics of vortex disk, its core component, are studied more and more deeply. The thermal deformation in high speed cutting is the main reason that affects the machining precision and quality of scroll disk. In this paper, the problem of cutting heat in the high speed and precision milling process of the combined line vortex disk is studied. The main work is as follows: 1. Numerical Control Milling of Scroll disk of combined profile. The method of numerical approximation is used to process the scroll disk. Firstly, rough machining strategy is adopted, and then the geometric dimension, shape precision and surface quality of workpiece. 2 are obtained by finishing on the basis of rough machining. Analysis of temperature variation at any time and position. By using the method of single variable, the variation of temperature with time caused by different heat sources at a certain y value of 20mm is simulated. The temperature increases first and then decreases to the maximum at 20 s, and the maximum temperature difference is 208 鈩，
本文编号：2163566
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