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大导程滚珠丝杠副螺母成型磨削加工建模与仿真
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摘要
滚珠丝杠副由于具有高效率、高精度、高刚度、低成本等特点,被广泛应用于机械、航天、航空、核工业等领域。高速精密滚珠丝杠副是发展高档数控机床的关键部件,传统结构的滚珠丝杠副已不能适应现代高速高精数控机床的发展需求。因此,研究提高滚珠丝杠副驱动速度的技术具有重大的经济意义和战略意义。基于高速精密滚珠丝杠副的发展要求,本文以昆山市科技局KC0720:大导程滚珠丝杠副螺母成型磨削加工建模与仿真为背景,围绕解决精密滚珠丝杠副高速化的关键技术──大导程滚珠丝杠副螺母成型磨削加工展开讨论,主要研究大导程滚珠丝杠副螺母成型磨削加工理论,大导程滚珠丝杠副螺母成型磨削砂轮截形计算和加工仿真动画设计。
     提高滚珠丝杠驱动速度的途径有两条:其一是提高丝杠的转速N,其二是增大丝杠导程Ph。因用提高转速办法来解决是不可取的。于是,大导程滚珠丝杠副在进给驱动的高速化中得到发展。但是大导程使加工制造的难度增大。本文介绍了大导程滚珠丝杠副螺母磨削加工方法,分析了各种加工大导程滚珠丝杠副螺母方法的优缺点,阐述了大导程滚珠丝杠副螺母磨削加工的研究现状和理论分析。
     本文提出一种新的加工方法,该方法在改变砂轮安装角的同时,也改变磨削砂轮的截形,对螺母进行磨削加工。
     根据螺旋面滚道曲面加工原理、齿轮啮合原理以及回转面砂轮加工螺母工艺建立了相应的数学模型,建立螺旋曲面的数学模型和砂轮磨削加工螺母螺旋滚道面的数学模型。以螺旋滚道的法向截形为初始已知条件,根据螺旋滚道面与砂轮回转面在接触点处法向矢量相同的原理,推导出接触线方程,由坐标转换得出接触线与砂轮轴截形之间的数学关系。使用Matlab数学编程软件进行计算求解接触点。根据实例求解砂轮截形,并研究在不同条件下砂轮截形的求解及它们之间的比较,对求解结果进行分析误差。
     使用SolidWorks中的COSMOSMotion插件对大导程滚珠丝杠副螺母进行磨削加工仿真动画。根据汉江机床厂昆山分厂的设备条件进行大导程滚珠螺母加工实验,并对加工好的大导程滚珠螺母进行运行调试检测。实验结果表明,本文提出的大导程滚珠丝杠副螺母成型磨削加工方法是可行的。
Ball screw mechanisms have been widely used in Machinery, Aviation, Aerospace, Nuclear industry and other fields, due to its performance such as its high efficiency, high precision , high rigidity, low-cost, etc. High-speed precision ball screws is key components of development of high-end CNC machine tools, the traditional structure of the ball screw can not meet the modern high-speed high-precision numerical control machine tool development needs. Therefore, it is of great economic significance and strategic significance to study the technology of increasing the driven-speed of the ball screw. Based on the requirements of the high-speed precision ball screw development, this thesis comes from the program: Modeling and Simulation of Large Pitch Ball Screw Nut Formation Grinding, which was sponsored by the city of Kunshan Technology KC0720. Around the settlement of the key technology of high speed of precision ball screw——the formation grinding of large pitch ball screw nut to discuss, the major researches: formation grinding theory of large pitch ball screw nut, calculation of wheel’s section and simulation design of grinding of large pitch ball screw nut formation grinding.
     To increase of feed speed of ball screw mechanism there are two ways: one is to increase the speed of the screw N, the other is to enlarge the lead Ph of the screw. The way of increasing of screw speed is undesirable. As a result, ball screws are developed in the high-speed feed drive. But the large pitch makes the manufacturing process more difficult. This thesis describes the large pitch ball screw nut grinding method, analyzes the advantages and disadvantages of a variety of large pitch ball screw nut processing method, and describes the research and theoretical analysis of the big pitch ball screw nut grinding.
     A new processing method is proposed in this thesis. In the method, we change the installation wheel angle, and also change the grinding wheel section, then grinding the nut.
     According to the principles of manufacturing helicoids, tooth meshing and rotary wheel processing nut technology, a mathematics model is constructed to reflect the manufacture process of nut,and the formula of the grinding wheel section is developed. The thread normal section as the initial conditions, the contact line equation is derived, according to the same normal vector of the spiral rolling pavement surface and rotary wheel in the contact point, the mathematics relationship between the contact line and the wheel shaft-shaped section is obtained from the coordinate transformation. The contact points of the section are obtained through the use of numerical calculation and Matlab mathematical software. through examples,the section of wheel is solved and the section's errors are analyzed.
     Use the COSMOSMotion of SolidWorks plug-in software to make grinding simulation animation of the big pitch ball screw nut. According to equipment conditions of the Hanjiang machine tool factory’s subsidiary factory in Kunshan, tests the large pitch ball nut processing, and then running the processed large lead ball nut for debugging testing. Test results show that the large pitch ball screw nut forming grinding method is feasible.
引文
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