2018年第3期
Technology and Test工艺与检测
电火花整形金刚石微粉砂轮的工艺试验研究
关佳亮戚泽海孙晓楠路文文
（北京工业大学机械工程与应用电子技术学院，北京100124）
摘要：针对ELID磨削轴承钢内圆存在的金属结合剂超硬磨料砂轮整形难题，采用电火花整形技术对金
刚石微粉砂轮进行工艺试验研究。在单脉冲放电能量理论指导下，进行正交试验探究脉冲电流、放电电压及占空比对砂轮表面三维粗糙度的影响及其最优参数组合。研究结果表明在脉冲电流10 A，放电电压70V，占空比20%的最佳工艺参数下进行电火花精密整形得到砂轮表面三维粗糙度的评价参数S,、S。、Ssx及Sxu分别为13.05μm、4.89μm、-0.35、5.307和得到精度为4.18μm的砂轮圆度。最后将电火花精密整形后的W40粒度金刚石砂轮应用在ELID磨削轴承钢内圆中得到表面粗糙度为96nm的加工表面。
关键词：金刚石微粉砂轮；电火花整形技术；正交试验；工艺参数优化；实验验证
中图分类号：TH161.14
文献标识码：A
DOI:10.19287/j.cnki.10052402.2018.03.025
Experimental study of diamond micro powder grinding wheel based on electrical discharge dressing
GUAN Jialiang,QI Zehai, SUN Xiaonan, LU Wenwen
( College of Mechanical Engineering and Applied Electronics Technology, Beijing University of
Technology, Beijing 100124, CHN)
Abstract : Aiming at shaping problem of metal forming agent super hard abrasive grinding wheel in ELID grinding
bearing steel intermal processing, experimental research of diamond micro powder grinding wheel were carried out by electrical discharge dressing technology. Under the theory of single pulse discharge ener-gy, orthogonal experiment was carried out in order to research the influence of pulse curent, discharge voltage, duty ratio on grinding wheel surface three dimensional roughness and its optimal technological parameters, Studies show that evaluation parameters of grinding wheel surface three dimensional roughness with Sp of 13. 05 μm, S, of 4. 89 μm, Ssx of 0. 35 and Sxu of 5. 307 and wheel roundnes5 accuracy of 4.18 μm are obtained with the pulse current of 10 A, the discharge voltage of 70 V and the duty ratio of 20%. The machined surface roughness of R,96 nm is obtained by ELID grinding bearing sseaaae shaping.
Keywords: diamond micro powder grinding wheel; electrical discharge dressing technology ; orthogonal experiment;
optimization of parameters; experimental verification
轴承钢因具有良好的耐磨性、抗腐蚀性及淬火和回火后具有高而均匀的硬度等优点被广泛应用于制造各种轴承套圈、滚动体等轴承零部件。但轴承钢优良的力学性能也使其传统的内圆磨削存在着刚玉类砂轮磨损堵塞后导致加工工件表面产生烧伤、裂纹及圆度差的问题{)。采用在线电解修整（ELID)磨削技术可实现将金属结合剂超硬磨料砂轮的持续修锐与磨削同步进行，继而克服了轴承钢内圆传统磨削加工中存在的上述难题。而金属结合剂超硬磨料砂轮的整形仍是
制进技求点机东
万方数据
目前存在的一大难题，且其整形精度将直接影响到后续ELID磨削轴承钢内圆的圆度及表面质量。目前国内外针对金属结合剂超硬磨料砂轮的整形进行了大量研究，如刘忠德[2]采用电火花修整技术针对50~63 μm粒度金属基金刚石砂轮进行单因素试验探究放电电压、脉冲电流、脉冲频率等对砂轮表面形貌的影响规律。黎文[3)采用电火花修整技术对金属结合剂金刚石微粉砂轮进行试验探究电源参数对整形效率的影响规律。王凯(4采用电火花修整技术对金属基金刚石
127.