DJYM70多线丝锥磨床动静压主轴单元研制

发布时间：2018-05-18 08:17

  本文选题：多线丝锥磨床 + 主轴单元　； 参考：《山东大学》2017年硕士论文

【摘要】：多线丝锥磨床采用多条磨削线的成型砂轮,以80m/s以上的磨削速度,实现丝锥的高效精密磨削加工,丝锥的加工精度和生产率高。主轴单元作为多线丝锥磨床的关键功能部件,直接影响多线丝锥磨床的整体性能,动静压主轴单元具有精度和刚度高、精度保持能力强等特点,能够很好的保证多线丝锥磨床的性能和精度要求。目前,国内80%的多线丝锥磨床依赖进口,因此,研制多线丝锥磨床用动静压主轴单元,不仅能够满足丝锥市场快速增长对多线丝锥磨床的需求,而且对提升国产动静压主轴单元功能部件整体技术水平,从而提高我国高端装备制造业的国际竞争力具有重要意义。本文主要研究工作如下:分析了丝锥磨床和主轴单元现状,提出了 DJYM70精密多线丝锥磨床的技.术要求,论证、确定了 DJYM70精密多线丝锥磨床动静压主轴单元的整体方案和动静压滑动轴承设计方案。该动静压主轴单元采用整体套筒式结构,双支承且一端止推的轴承组合,止推端放置在主轴单元的前端;基于动静压滑动轴承的特点,为减少传动环节,提高传动效率,该主轴单元不设置卸荷装置,径向滑动轴承采用偶数个对置等面积油腔且有回油槽的结构,止推轴承采用扇形多油腔结构,定压式供油,小孔节流;密封装置采用间隙式非接触式密封。对动静压主轴单元进行了设计计算。主轴材料采用38CrMoAl,碳氮共渗处理,渗层厚度0.4-0.5mm,前后轴承轴瓦选用耐磨系数较高的锡青铜ZQSn-6-6-3,设计计算了主轴轴颈和最佳支承跨距,以及小孔节流的节流孔直径、供油压力和滑动轴承的最小径向间隙;验算了主轴单元砂轮处和轴承径向、轴向刚度;采用2号主轴油,计算得到主轴单元在使用转速下的温升为17.3℃,满足温升要求。分析了 DJYM70动静压主轴单元主要零件的加工工艺,阐述了轴承内孔和内腔、箱体轴承孔、主轴、套筒外圆的配磨等加工质量的保障措施;研究了主轴单元的装配工艺,对主轴单元装配中存在的装入困难、调整垫轴向尺寸不稳、装配完成后主轴转动不灵活等问题给出了具体解决措施,并对装配完成的动静压主轴单元进行了运转调试。本课题对研制的DJYM70精密多线丝锥磨床动静压主轴单元进行了台架试验,实测了主轴单元的回转精度、轴向窜动、轴向刚度、径向刚度、主轴振动、轴承温升等主要性能指标。试验结果表明,该动静压主轴单元达到了设计要求。
[Abstract]:The multi-wire taps grinding machine adopts the forming grinding wheel with multiple grinding lines. With the grinding speed above 80m/s, the high-efficiency precision grinding of the tap is realized, and the machining precision and productivity of the tap are high. As the key functional component of multi-wire taps grinding machine, the spindle unit directly affects the overall performance of the multi-wire taps grinder. The static and static pressure spindle unit has the characteristics of high precision and stiffness, strong precision retention ability, etc. It can ensure the performance and precision of multi-wire taps grinder. At present, 80% of the domestic multi-wire taps grinding machines rely on imports. Therefore, the development of the dynamic and static spindle unit for the multi-wire taps grinder can not only meet the rapid growth of the tap market for the multi-wire taps grinding machine. Moreover, it is of great significance to improve the overall technical level of the functional components of the domestic static and dynamic spindle unit, and thus to improve the international competitiveness of the high-end equipment manufacturing industry in China. The main work of this paper is as follows: the present situation of taps grinder and spindle unit is analyzed, and the technology of DJYM70 precision multi-wire taper grinder is put forward. The whole scheme of the dynamic and static spindle unit of DJYM70 precision multi-wire taps grinder and the design scheme of the hydrostatic sliding bearing are determined. The dynamic and static pressure spindle unit adopts the integral sleeve type structure, the bearing combination with double support and one end thrust, the thrust end is placed at the front end of the spindle unit, based on the characteristics of the dynamic and static pressure sliding bearing, the transmission link is reduced and the transmission efficiency is improved. The main shaft unit is not equipped with unloading device, radial sliding bearing adopts even number of equal area oil cavity with return oil groove structure, thrust bearing adopts sector multi-oil cavity structure, constant pressure oil supply type, orifice throttling; The sealing device adopts the clearance type non-contact seal. The static and static pressure spindle unit is designed and calculated. The main shaft material was treated with 38CrMoAl, Carbon-nitriding, the thickness of permeation layer was 0.4-0.5 mm, and the tin bronze ZQSn-6-6-3 with high wear resistance coefficient was used to design and calculate the spindle journal and the optimum support span, as well as the throttle diameter of orifice throttling. Oil supply pressure and the minimum radial clearance of sliding bearing; check and calculate the axial and radial stiffness of the grinding wheel and bearing of the spindle unit; using No. 2 spindle oil, calculate the temperature rise of the spindle unit at 17.3 鈩，

本文编号：1905113