三段基圆渐开线涡旋盘的数控加工

发布时间：2018-12-14 13:13

【摘要】：近年来随着涡旋流体机械应用领域的不断扩展,涡旋型线研究方面取得了颇多的成果,型线的种类日益繁多,型线设计的方法实用性强,其中法向等距理论的提出更是增加了型线设计的柔性,同时也增加了加工难度。因此运用数控加工技术完成涡旋型线的加工过程就显得尤为重要。本文主要依据涡旋盘的啮合原理和法向等距曲线理论,研究了三段基圆渐开线涡旋型线的拟合与数控加工。主要研究内容包括:(1)运用曲率函数法建立了三段基圆渐开线涡旋型线的数学模型,基于三维设计软件创建出涡旋盘的三维模型,同时依据型线的特点选择数值逼近法为涡旋盘的加工方法。针对涡旋盘的特点和加工精度要求,对涡旋盘的加工工艺进行了规划。(2)考虑到三段基圆渐开线涡旋型线不能直接进行加工,应用双圆弧对该型线进行拟合,并通过MATLAB软件完成拟合计算过程,设计刀具路径从而完成涡旋盘精加工过程的程序编制并利用现有加工设备完成涡旋盘的实体加工过程。将双圆弧拟合与单圆弧拟合相比较,发现双圆弧拟合时拟合节点数减少80%,加工圆弧段数减少74%,拟合误差降低95%,因此双圆弧拟合效果更好。(3)用三坐标测量仪和SJ-210表面粗糙度测量仪对加工出的涡旋盘进行精度检测,表面粗糙度的测量结果为:涡旋齿壁表面粗糙度为0.539?m,涡旋齿顶面和齿底面表面粗糙度为0.420?m,表面粗糙度测量结果均小于0.8?m。结果表明,加工出的涡旋盘满足加工精度要求。本文主要完成了三段基圆渐开线涡旋型线的生成和加工过程的研究,通过对加工精度及表面粗糙度的检测,表明该研究成果满足型线的设计与加工要求。对三段基圆渐开线涡旋型线涡旋盘的加工具有一定的参考价值。
[Abstract]:In recent years, with the continuous expansion of the application field of vortex fluid machinery, a lot of achievements have been made in the research of the vortex profile, and the variety of the profile is becoming more and more numerous, and the design method of the profile is practical. The theory of normal isometry not only increases the flexibility of profile design, but also increases the processing difficulty. Therefore, it is very important to use NC machining technology to complete the machining process of vortex profile. Based on the meshing principle of vortex disk and the theory of normal equidistant curve, the fitting and NC machining of the involute vortex profile of three basic circles are studied in this paper. The main research contents are as follows: (1) the mathematical model of the involute vortex profile is established by using the curvature function method, and the 3D model of the scroll disk is created based on the 3D design software. At the same time, according to the characteristics of the profile, the numerical approximation method is selected as the machining method of the scroll disk. According to the characteristics of the scroll disk and the requirement of machining precision, the machining process of the scroll disk is planned. (2) considering that the involute vortex profile of the three-stage basic circle can not be processed directly, the double circular arc is used to fit the profile. The process of fitting and calculating is completed by MATLAB software, the tool path is designed to complete the process of scroll disk finishing, and the solid process of scroll disk is finished by using the existing machining equipment. By comparing double arc fitting with single arc fitting, it is found that the number of fitting nodes is reduced by 80, the number of arc segments is reduced by 74 and the fitting error is reduced by 95 percent. Therefore, the effect of double arc fitting is better. (3) the surface roughness of the vortex disk is measured by using the 3D coordinate measuring instrument and the SJ-210 surface roughness measuring instrument. The surface roughness of the vortex tooth wall is 0.539 m. The surface roughness of the top and bottom surfaces of the vortex teeth is 0.420 m, and the surface roughness is less than 0.8 m. The results show that the vortex disk can meet the requirement of machining precision. In this paper, the generation and machining process of the three-stage involute vortex profile of the base circle are studied. Through the inspection of machining precision and surface roughness, it is shown that the research results meet the design and machining requirements of the profile. It has a certain reference value for the machining of the involute vortex disk of three-stage base circle.
【学位授予单位】：兰州理工大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TG659

【参考文献】