The machinability of 7055 aluminum alloy with wide temperature range is examined, with focus on the three cutting forces, surface quality and work hardening of the material under low, medium, and high temperatures. The results demonstrate that, under low temperature, the work hardening depth of 7055 aluminum alloy is almost insensitive to the cutting speed, whereas at a higher cutting speed, the work hardening degree of the material first decreases and then increases; both the work hardening degree and hardening depth are significantly positively correlative to the cutting depth: the work hardening degree is positively correlative, though not so significantly, to the feed rate, while the work hardening depth is insensitive to the feed rate and remains at 100 μm in all cases. Under high temperature, the work hardening degree of 7055 aluminum alloy is positively correlative to the cutting speed; at depths smaller than 80 μm below the machined surface, the work hardening degree is negatively correlative to the cutting depth; at depths larger than 80 μm below the cutting surface, the work hardening degree of the material becomes significantly positively correlative to the cutting depth. A mathematical model of three cutting forces in dry cutting with wide temperature range is established based on wide temperature-range dynamic impact experimental results and the orthogonal cutting model, and modified using the LMSE (least mean square error) principle. The errors between the predicted and experimental three cutting forces, after modification, are all smaller than 10%, which is within the permissible limit of error. This verifies that the modified three cutting force prediction model can predict cutting forces accurately.

研究了7055铝合金在宽温度范围内的切削性能，重点研究了三种切削力，表面质量以及材料在低温，中温和高温下的加工硬化。结果表明，在低温下7055铝合金的加工硬化深度对切削速度几乎不敏感，而在较高的切削速度下，材料的加工硬化度先降低后升高。加工硬化度和硬化深度与切削深度均呈显着正相关：虽然加工硬化度与切削速度呈正相关，但与进给速度没有显着正相关，而加工硬化深度与切削速度呈正相关。在所有情况下均为μm。在高温下 7055铝合金的加工硬化度与切削速度成正相关。在加工表面以下小于80μm的深度处，加工硬化度与切削深度呈负相关; 在切削表面以下大于80μm的深度处，材料的加工硬化度与切削深度呈显着正相关。基于宽温度范围动态冲击实验结果和正交切削模型，建立了宽温度范围内干切削中三种切削力的数学模型，并采用LMSE（最小均方误差）原理进行了修正。修改后，预测的和实验的三个切削力之间的误差均小于10％，这在允许的误差范围内。