• CN:11-2187/TH
  • ISSN:0577-6686

机械工程学报 ›› 2019, Vol. 55 ›› Issue (13): 212-223.doi: 10.3901/JME.2019.13.212

• 制造工艺与装备 • 上一篇    下一篇

流道结构对加压内冷却开槽砂轮磨削性能的影响

彭锐涛1,2, 刘开发1,2, 黄晓芳1,2, 降皓鉴1,2, 张珊3   

  1. 1. 湘潭大学机械工程学院 湘潭 411105;
    2. 湘潭大学复杂轨迹加工工艺及装备教育部工程研究中心 湘潭 411105;
    3. 中国航发湖南南方宇航工业有限公司 株洲 412002
  • 收稿日期:2018-08-01 修回日期:2018-12-16 出版日期:2019-07-05 发布日期:2019-07-05
  • 通讯作者: 彭锐涛(通信作者),男,1982年出生,教授,博士研究生导师。主要研究方向为高效精密加工与传动。E-mail:pengruitao@xtu.edu.cn
  • 基金资助:
    国家自然科学基金(51475404)、湖南省自然科学基金(2018JJ4082)、湖南省教育厅重点(18A077)和湖南省普通高校青年骨干教师培养经费(20151053008gg)资助项目。

Effect of Flow Channel Structure on Performance of Pressurized Internal-cooling Slotted Grinding Wheels

PENG Ruitao1,2, LIU Kaifa1,2, HUANG Xiaofang1,2, JIANG Haojian1,2, ZHANG Shan3   

  1. 1. School of Mechanical Engineering, Xiangtan University, Xiangtan 411105;
    2. Engineering Research Center of Complex Track Processing Technology & Equipment, Ministry of Education, Xiangtan University, Xiangtan 411105;
    2. AECC Hunan South Astronautics Industry Co., LTD, Zhuzhou 412002
  • Received:2018-08-01 Revised:2018-12-16 Online:2019-07-05 Published:2019-07-05

摘要: 针对镍基高温合金磨削时磨削区因砂轮气障效应引起的过热问题,提出采用加压式内冷却磨削方法,鉴于砂轮内流道结构影响磨削液的流动特性和砂轮的磨削性能,同时考虑流道加工工艺和砂轮旋转时离心力的影响,设计直线型和弧线型两种内流道结构。利用计算流体动力学方法分析了流道结构对磨削区流场的影响,表明弧线型流道结构下磨削区的流体速度和分布均匀性更高。制备了具有弧线型和直线型内流道的两种加压内冷却开槽砂轮,在相同的磨削参数下进行了镍基高温合金磨削对比试验,分析砂轮线速度和磨削液压力对磨削温度、表面粗糙度和表面形貌的影响规律。结果表明:相比直线型流道,弧线型流道的冷却润滑效果更好,随砂轮线速度和磨削液压力的增大其换热效率提升更显著,得到的磨削温度和工件表面粗糙度值分别降低了16.8%和17.6%,并获得了更规则的加工表面形貌。

关键词: 高温合金, 加压内冷却, 开槽砂轮, 流道结构, 磨削性能

Abstract: Aiming at the overheating problem caused by the gas barrier effect of the grinding wheel in the grinding of nickel-base superalloys, a pressurized internal cooling grinding method is proposed. In view of the influence of the flow channel structure on the flow characteristics of the grinding fluid and the performance of the grinding wheel, and considering the processing technology of the flow channel and the centrifugal force caused by the rotation of the grinding wheel, two types of straight and curved internal channel structures are designed. The computational fluid dynamics method is used to analyze the influence of the channel structure on the flow field in the grinding zone. Results show that the fluid velocity and distribution uniformity of the grinding zone under the curved flow channel structure are higher. Two pressurized internal cooling slotted grinding wheels with curved and straight internal flow channels are prepared. The grinding comparison tests of nickel-base superalloy are carried out under the same grinding parameters, and the effects of grinding wheel speed and fluid pressure on the grinding temperature, surface roughness and morphology are analyzed. Results indicate that compared with the straight flow channel, better cooling and lubrication effects are obtained by the curved flow channel, and the heat exchange efficiency is more remarkable as the grinding speed and the fluid pressure increase. Grinding temperature and surface roughness of the workpiece are reduced by 16.8% and 17.6%, respectively, and a more regular surface morphology is obtained.

Key words: flow channel structure, grinding performance, pressurized internal cooling, slotted grinding wheel, superalloy

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