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Investigation on the Effect of a Pre-Center Drill Hole and Tool Material on Thrust Force Surface Roughness and Cylindricity in the Drilling of Al7075

机译:预中心孔和刀具材料对Al7075钻孔时推力表面粗糙度和圆柱度的影响研究

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摘要

Drilling is one of the most useful metal cutting processes and is used in various applications, such as aerospace, electronics, and automotive. In traditional drilling methods, the thrust force, torque, tolerance, and tribology (surface roughness) are related to the cutting condition and tool geometry. In this paper, the effects of a pre-center drill hole, tool material, and drilling strategy (including continuous and non-continuous feed) on thrust force, surface roughness, and dimensional accuracy (cylindricity) have been investigated. The results show that using pre-center drill holes leads to a reduction of the engagement force and an improvement in the surface quality and cylindricity. Non-continuous drilling reduces the average thrust force and cylindricity value, and High Speed Steels HSS-Mo (high steel speed + 5–8% Mo) reduces the maximum quantity of cutting forces. Moreover, cylindricity is directly related to cutting temperature and is improved by using a non-continuous drilling strategy.
机译:钻孔是最有用的金属切割工艺之一,可用于各种应用,例如航空航天,电子和汽车。在传统的钻孔方法中,推力,扭矩,公差和摩擦学(表面粗糙度)与切削条件和刀具几何形状有关。在本文中,已经研究了预中心钻孔,工具材料和钻孔策略(包括连续和非连续进给)对推力,表面粗糙度和尺寸精度(圆柱度)的影响。结果表明,使用预中心孔可降低啮合力,并改善表面质量和圆柱度。非连续钻孔会降低平均推力和圆柱度值,而高速钢HSS-Mo(高钢速+ 5–8%Mo)会降低最大切削力。而且,圆柱度与切削温度直接相关,并且通过使用非连续钻孔策略可以提高圆柱度。

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