Study on creep-feed deep grinding of K444 nickel-based superalloy with corundum grinding wheel
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摘要: 为评价K444高温合金的磨削加工性能,采用棕刚玉砂轮和白刚玉砂轮进行磨削试验,对比分析其磨削力、磨削比能、磨削工件的表面形貌和表面粗糙度以及砂轮磨损。结果表明:相比于白刚玉砂轮,棕刚玉砂轮的磨削力更小,磨削后工件表面粗糙度低,其表面粗糙度Ra在0.206~0.455 μm,更易获得光滑的磨削表面。对表面粗糙度的敏感度分析发现:2种刚玉砂轮对切深ap最敏感,其次是工件进给速度vw,对砂轮线速度vs敏感度最小;棕刚玉砂轮磨削K444高温合金的砂轮磨损程度更低,当材料去除率RMRR处于0.3~1.0 mm3/(mm·s)时,2种砂轮的磨损比在1.36~1.40。
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关键词:
- K444镍基高温合金 /
- 缓进深切磨削 /
- 刚玉砂轮 /
- 表面完整性
Abstract: To evaluate the grindability of nickel-based superalloy K444, brown alumina and white alumina abrasive wheels were used in this work. The grinding force, specific grinding energy, tool wear, the ground surface morphology and roughness were compared and analyzed. The results showed that brown alumina abrasive wheel had smaller grinding force, lower ground surface roughness compared with white alumina abrasive wheel. The ground surface roughness Raafter grinding with brown alumina abrasive wheel was 0.20~0.45 μm, it was easier for brown alumina abrasive wheel to obtain a smooth ground surface. The sensitivity analysis of superalloy surface roughness showed that these two kinds of alumina abrasive wheels were the most sensitive to the depth of cut ap, followed by the workpiece speed vw, and the least sensitive to the wheel speed vs. The wear of brown alumina abrasive wheel was lower than white alumina abrasive wheel. When the material removal rate RMRR was between 0.3 mm3/(mm·s) and 1.0 mm3/(mm·s), the wear ratio of the two grinding wheels was between 1.36 and 1.40.
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