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Research on Improving Grinding Performance by Blast Conditioning

喷砂调理提高磨削性能的研究

基本信息

批准号：
06650157
负责人：
YAGISHITA Hukuzo
金额：
$ 1.28万
依托单位：
Numazu College of Technology
依托单位国家：
日本
项目类别：
Grant-in-Aid for General Scientific Research (C)
财政年份：
1994
资助国家：
日本
起止时间：
1994 至 1995
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-06650157/
关键词：
Grinding Grinding wheel Blast conditioning Distribution of cutting edges Dressing Wet blasting 砥石研削性能

项目摘要

In this research, a new dressing method for WA (White alundm) wheel is proposed, which may be called as "Blast conditioning". Blast conditioning is the process that low concentration slurry of synthetic resin particles with grinding fluid is blasted during only 5-15 seconds from a blasting gun by means of low pressure compressed air of about 0.3 MPa. After a vitrified bond WA wheel (WA46H7V75R) of grade H is trued with a single point or a multi-point diamond truer, blast conditioning is applied. Grinding tests of hardened steel of S45C (Hv753) are carried out following micro-observing abrasive grains on wheel periphery and evaluating distribution of cutting edges. On the basis of variations of ground suface roughness, grinding force and cutting edges on grains in relation to increment of stock removel, the effect of blast conditioning is considered. Obtained results are summarized as follows :(1) Although an ideal cutting edge distribution is produced by blast conditioning, the ground surface roughness is inferior to that without blast conditioning. This experimental result is in out of accordance with grinding theory.(2) The cause, that blast conditioning produces inferior ground surface roughness, is increment of distribution range due to falling away of abrasive grains from wheel periphery. Because blast conditioning not only causes micro-fracture in abrasive grains and conditions micro-cutting edges on each grain, but also removes a part of bonding material among abrasive grains.Based on the obtained results, continuing grinding tests are planned by changing the grade of WA wheel to harder I, J and K from H.

本研究提出了一种新的WA（White alundm）砂轮修整方法，可称为“喷砂修整”。喷砂调理是将合成树脂颗粒与磨削液的低浓度浆料从喷枪中用约 0.3 MPa 的低压压缩空气在短短 5-15 秒内进行喷砂的过程。使用单点或多点金刚石修整器修整 H 级陶瓷结合剂 WA 砂轮 (WA46H7V75R) 后，进行喷砂处理。 S45C（Hv753）淬硬钢的磨削试验是通过微观观察砂轮周边的磨粒并评估切削刃的分布来进行的。根据磨削表面粗糙度、磨削力和颗粒切削刃随切削量增量的变化，考虑喷砂处理的影响。所得结果总结如下：(1)尽管喷砂处理产生了理想的切削刃分布，但磨削表面粗糙度比未喷砂处理的要差。该实验结果与磨削理论不相符。(2)喷砂修整产生较差磨削表面粗糙度的原因是磨粒从砂轮周边脱落导致分布范围增大。因为喷砂修整不仅会导致磨粒中的微断裂，并修整每个磨粒上的微切削刃，而且还去除了磨粒之间的部分粘结材料。根据所获得的结果，计划通过将WA砂轮的等级从H改为更硬的I、J和K来继续磨削试验。