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旨在填补7055铝合金三维钻削有限元模拟方面的不足,以T6态7055铝合金为研究对象,选用两种不同刀具对其切削力、切屑形态及切削过程应力分布进行实验和仿真分析。实验和仿真结果表明:钻削力与钻削速度呈负相关,与进给量呈明显的正相关;钻削速度越大、进给量越小,钻削力的实验值和仿真值的误差越小;麻花钻钻削时,切屑卷曲直径和切屑变形厚度的实验值和仿真值一致性高达94%,三刃钻钻削时,误差较麻花钻大,但误差低于15%,属于误差允许范围;横刃钻削应力与钻削中心距离呈负相关,麻花钻钻削时,有明显的最小切削刃钻削应力,大概在距离钻削中心2 mm处;在稳态钻削阶段,三刃钻的切削刃钻削应力明显高于麻花钻,进给量为0.2 mm/r时,在钻削过程的后期,麻花钻的切削刃钻削应力的增大趋势较三刃钻明显。
The purpose of this study is to fill the deficiency of 3D finite element simulation of 7055 aluminum alloy. Taking T6 7055 aluminum alloy as the research object, two different tools are used to test and simulate the cutting force, chip shape and stress distribution in cutting process. The experimental results and the simulation results show that the drilling force is negatively correlated with the drilling speed and positively correlated with the feed rate. The bigger the drilling speed is, the smaller the feed rate is. The error between the experimental value and the simulation value The smaller the twist drill drilling, chip curl diameter and chip deformation thickness of the experimental value and simulation value of up to 94%, triple-edge drilling, the error is larger than the twist drill, but less than 15% error is an error Allowable range; Chisel drilling stress and drilling center distance was negatively correlated, twist drill drilling, there is a clear minimum cutting edge drilling stress, about 2 mm from the drilling center; steady-state drilling phase, The cutting edge drilling stress of the triple-edge drill is obviously higher than that of the twist drill. When the feed rate is 0.2 mm / r, the increasing tendency of the cutting edge drilling twist of the twist drill tends to be more obvious than that of the triple-edge drill at the later stage of the drilling process.