分形理论在放电修整超硬磨料砂轮实验中的应用研究

doi:10.3969/j.issn.1000-1093.2013.07.009

兵工学报 ›› 2013, Vol. 34 ›› Issue (7): 853-857.doi: 10.3969/j.issn.1000-1093.2013.07.009

分形理论在放电修整超硬磨料砂轮实验中的应用研究

蔡兰蓉¹, 阮文裕¹, 胡德金², 李敏¹

1. 天津职业技术师范大学高速切削与精密加工重点实验室, 天津300222; 2. 上海交通大学机械与动力工程学院, 上海200030

收稿日期:2012-07-30 修回日期:2012-07-30 上线日期:2014-08-19
作者简介:蔡兰蓉(1972—),女,副教授。
基金资助:
国家自然科学基金项目(50775143);天津市自然科学基金项目(10JCYBJC07000);天津职业技术师范大学科研启动项目(KYQD08010)

The Application of Fractal Theory in Electrical Discharge Truing/ Dressing Diamond Grinding Wheels

CAI Lan-rong¹, RUAN Wen-yu¹, HU De-jin², LI Min¹

1. Key Laboratory of High Speed Cutting & Precision Machining,Tianjin University of Technology and Education, Tianjin 300222, China; 2. School of Mechanical and Power Engineering, Shanghai Jiaotong University, Shanghai 200030, China

Received:2012-07-30 Revised:2012-07-30 Online:2014-08-19

摘要/Abstract

摘要： 电火花放电修整(EDD)砂轮技术利用放电产生的热能熔融气化结合剂使磨粒突出修锐砂轮,是很有发展前途的特种加工修整方法。放电加工的介质放电轨迹显示出树枝分叉倾向,具有明显的分形结构,其形态是影响放电能量分布的重要因素。基于分形理论对煤油、空气及雾状去离子水3 种放电介质的热能量分布特征进行分析,并在3 种介质中进行青铜结合剂金刚石砂轮EDD实验。研究结果表明:基于分形几何学的仿真放电轨迹特征与金刚石砂轮实验修锐质量基本符合,可以利用介质的放电图形及分形维数来预测砂轮的修锐微观形貌及修锐质量。

关键词: 机械制造工艺与设备, 分形理论, 放电介质, 修锐, 金刚石砂轮

Abstract: Electrical discharge dressing (EDD) process is a non-traditional promising truing and dressing technology for superabrasive wheels. The process makes use of electrical energy to melt and vaporize the wheel bond, and make the abrasive grains stick from the grinding wheel. The development of lightning leader displays a stochastic discharge channel with branching and tortuous structure during EDD. It obviously has characteristic of self-similarity, which can be well described by fractals. A discharge channels simulation model based on the fractal theory shows the thermal energy distribution of various discharge mediums on the diamond wheel. And various discharge mediums including kerosene-based oil,impressed air and misted deionized water, are applied on EDD bronze-bonded diamond grinding wheels. The surface topography of dressed diamond grinding wheel is observed by VHX-1000 three-dimensional digital microscope. The analyses indicate that the surface topography of dressed diamond grinding wheel is consistent with the feature of simulation discharge channel based on the fractal theory. At the same time, the fractal simulation model of discharge channels is benefit to predict the wheel dressing microstructure and fressing quality.

Key words: machinofacture technique and equipment, fractal theory, discharge mediums, dressing, diamond wheel

中图分类号:

TG580. 61

蔡兰蓉, 阮文裕, 胡德金, 李敏. 分形理论在放电修整超硬磨料砂轮实验中的应用研究[J]. 兵工学报, 2013, 34(7): 853-857.

CAI Lan-rong, RUAN Wen-yu, HU De-jin, LI Min. The Application of Fractal Theory in Electrical Discharge Truing/ Dressing Diamond Grinding Wheels[J]. Acta Armamentarii, 2013, 34(7): 853-857.

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分形理论在放电修整超硬磨料砂轮实验中的应用研究

The Application of Fractal Theory in Electrical Discharge Truing/ Dressing Diamond Grinding Wheels

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