• CN:11-2187/TH
  • ISSN:0577-6686

机械工程学报 ›› 2017, Vol. 53 ›› Issue (5): 199-212.doi: 10.3901/JME.2017.05.199

• 制造工艺与装备 • 上一篇    

基于切深模型的汽车曲轴轴颈巴厘线磨削精度控制*

李静1, 高华钰1, 沈南燕1, 黄海涛2, 方明伦1   

  1. 1. 上海大学上海市智能制造及机器人重点试验室 上海 200072;
    2. 上海机床厂有限公司 上海 200093
  • 出版日期:2017-03-05 发布日期:2017-03-05
  • 作者简介:

    李静,女,1982年出生,博士,讲师,硕士研究生导师。主要研究方向为先进制造装备及磨削技术。

    E-mail:ianbest@shu.edu.cn

    沈南燕(通信作者),女,1982年出生,博士,讲师,硕士研究生导师。主要研究方向为智能机床及磨削技术。

    E-mail:shny@shu.edu.cn

  • 基金资助:
    * 国家科技重大专项资助项目(2013ZX04002031); 20160905收到初稿,20161205收到修改稿;

Accuracy Control of Ballig of Crankshaft Journals in Grinding Process Based on Cutting Depth Model

LI Jing1, GAO Huayu1, SHEN Nanyan1, HUANG Haitao2, FANG Minglun1   

  1. 1. Shanghai Key Lab of Intelligent Manufacturing and Robotics, Shanghai University, Shanghai 200072;
    2. Shanghai Machine Tool Works Co., Ltd, Shanghai 200093
  • Online:2017-03-05 Published:2017-03-05

摘要:

汽车曲轴作为发动机关键零件,其主轴颈、连杆颈巴厘线的磨削精度对发动机性能有较大影响。切入磨削过程中,成形砂轮轮廓将直接反映在曲轴轴颈上,因此研究了基于砂轮修整切深模型的成形砂轮廓形修整误差在线测量及补偿方法,通过控制砂轮廓形修整精度来保证曲轴轴颈巴厘线的磨削精度。采用声发射传感器搭建了砂轮修整过程监测系统,建立了砂轮圆弧修整过程中任意位置的声发射信号均方根值与修整切深的数学模型。通过构建切深模型参数与修整进给速度和修整圆弧中凸量的函数关系,得到了砂轮圆弧修整变参数切深模型,提高了切深模型的准确性。在此模型的基础上,提出了砂轮廓形修整误差补偿策略及实现流程。试验证明:采用变参数切深模型可以准确获得砂轮实际修整廓形,定量评定砂轮廓形修整误差,并且修整误差补偿策略能够有效地保证巴厘线廓形磨削精度。

关键词: 参数辨识, 切深模型, 砂轮修整, 声发射信号, 巴厘线

Abstract:

The crankshaft is a so important part of the automotive engine that the machining accuracy of Ballig of its main journals and crankpins in grinding process has a great impact on the engine performance. The profile of the form grinding wheel reflects on the crankshaft journal in plunge grinding process directly. Therefore, a method for on-line measurement and compensation of the profile of the form grinding wheel is proposed based on the cutting depth model, which ensures the accuracy of Ballig of crankshaft journals in grinding by controlling the profile accuracy of grinding wheel in dressing process. Based on the monitoring system using the acoustic emission sensor, the basic mathematical model of the relationship between the RMS of acoustic emission signal and the cutting depth in grinding wheel dressing is established. To improve the accuracy and reliability of the basic model, the cutting depth model with the variable parameters is introduced by constructing the function between the model parameters and the dressing parameters, such as the feed rate and the mid-drum. And then a method for the compensation of the profile of grinding wheel and its implementation process in dressing process are put forward. The experimental results show that the actual dressing profile of the grinding wheel for evaluating its profile error quantitatively can be achieved by the cutting depth model and thus the machining accuracy of Ballig of crankshaft journals can be satisfied by compensating for the profile error of grinding wheel in dressing.

Key words: acoustic emission signal, cutting depth model, parameters identification, wheel dressing, ballig grinding