基于成形磨削的螺杆转子误差控制方法研究

发布时间：2018-03-06 05:37

本文选题：成形磨削　切入点：螺杆转子　出处：《大连理工大学》2013年硕士论文　论文类型：学位论文

【摘要】：螺杆转子作为螺杆压缩机的核心部件其加工精度直接影响螺杆压缩机的工作性能。目前成形磨削已逐渐取代铣削加工成为转子精加工的主要方式,但国内多数螺杆加工企业未能掌握转子磨削专用精密加工设备的制造技术,转子加工误差得不到控制,加工精度得不到保证,只能高价进口国外相应加工设备。因此研究磨削螺杆转子误差控制方法对于实现转子磨削专用精密加工设备国产化有着重要意义。本文在国家自然科学基金项目(No.50975038)资助下,以课题组螺杆转子的研究成果为基础,研究了螺杆转子成形磨削原理及加工过程,建立了转子磨削时分度误差与型线误差计算与补偿模型,提出了转子型线数据与砂轮数据的处理方法,开发了磨削螺杆转子误差控制软件并采用工程实际数据对本文误差控制方法进行了验证。首先,研究了圆柱螺旋面的加工原理。基于啮合原理建立了转子螺旋面与砂轮回转面的接触条件式。根据接触条件式建立了转子型线与砂轮截形的互逆求解数学模型。研究了转子不产生过渡曲面与不被过切的条件,从而确定了砂轮安装参数的调整范围。其次,提出了磨削转子误差控制方法。分析了螺杆转子成形磨削加工过程,以此为基础提出了转子粗磨阶段控制分度误差,精磨阶段控制型线误差的误差控制策略。针对转子分度误差,建立了误差计算模型,通过调整磨削进给量实现了对分度误差的控制。针对转子型线误差,提出了误差评估方法,通过型线更新或砂轮修整实现了对型线误差的控制。接着,建立了螺杆检测型线数据与砂轮修整数据的处理方法。采用角度法对螺杆检测型线数据进行噪声点剔除,采用离散点列能量法对其进行光顺处理；对于砂轮修整数据采用双圆弧样条拟合法对其进行拟合处理。最后,采用Matlab高级编程语言实现了分度误差计算与补偿、型线误差评估与补偿等主要算法,开发了《磨削螺杆转子误差控制软件》,并对软件进行了测试；通过提取螺杆磨床TG350E勺实际加工数据验证了本文误差控制方法的正确性。本文研究的磨削螺杆转子误差控制方法对于提高我国螺杆转子高效高精度加工水平有着重要的指导意义和参考价值。
[Abstract]:As the core component of screw compressor, the machining accuracy of screw rotor has a direct impact on the performance of screw compressor. At present, forming grinding has gradually replaced milling as the main way of rotor finishing. However, most screw processing enterprises in China have failed to master the manufacturing technology of the special precision machining equipment for rotor grinding, so the rotor machining error can not be controlled and the machining accuracy can not be guaranteed. Therefore, it is of great significance to study the error control method of grinding screw rotor in order to realize the localization of the special precision machining equipment for rotor grinding. This paper, supported by National Natural Science Foundation Project No. 50975038, has studied the grinding principle and machining process of screw rotor based on the research results of the research group of screw rotor. The calculation and compensation model of rotor grinding time division error and profile error is established, and the processing method of rotor profile data and grinding wheel data is put forward. The error control software of grinding screw rotor is developed and the error control method is verified by engineering data. First, In this paper, the machining principle of cylindrical helical surface is studied. Based on the meshing principle, the contact conditions between the rotor helical surface and the rotary surface of the grinding wheel are established. According to the contact condition formula, the mutual inverse solution mathematical model of the rotor profile and the grinding wheel section is established. The condition that the rotor does not produce transition surface and is not overtangent is studied. Thus, the adjustment range of grinding wheel installation parameters is determined. Secondly, the error control method of grinding rotor is put forward, and the grinding process of screw rotor is analyzed, based on which the control indexing error in rough grinding stage of rotor is proposed. The error control strategy of control profile error in grinding stage is presented. The error calculation model is established for the rotor indexing error, and the indexing error is controlled by adjusting the grinding feed, and the error evaluation method is put forward for the rotor profile error. The control of the profile error is realized by updating the profile or dressing the grinding wheel. Then, the processing method of screw inspection profile data and grinding wheel dressing data is established. The angle method is used to eliminate the noise points of the screw detection profile data, and the discrete point row energy method is used to smooth the data. The grinding wheel dressing data are fitted by double arc spline fitting method. Finally, the Matlab advanced programming language is used to realize the calculation and compensation of indexing error, the evaluation and compensation of profile error, and the software of grinding screw rotor error control is developed, and the software is tested. The accuracy of the error control method is verified by extracting the actual processing data of the screw grinder TG350E spoon. The error control method of grinding screw rotor studied in this paper has important guiding significance and reference value for improving the high efficiency and high precision machining level of screw rotor in China.
【学位授予单位】：大连理工大学
【学位级别】：硕士
【学位授予年份】：2013
【分类号】：TG580.6;TH45

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