Hrițuc Adelina, Mihalache Andrei Marius, Dodun Oana, Slătineanu Laurențiu, Nagîț Gheorghe
Department of Machine Manufacturing Technology, "Gheorghe Asachi" Technical University of Iasi, 700050 Iasi, Romania.
Micromachines (Basel). 2023 Jan 28;14(2):341. doi: 10.3390/mi14020341.
In some cases, industrial practice requires the production of walls or parts with a thickness of less than one millimeter from a metal workpiece. Such parts or walls can be made by milling using disc cutters. This machining method can lead to the generation of residual stresses that determine the appearance of a form deviation characterized by bending the part or the thin wall. To evaluate the suitability of a metallic material for the manufacturing of thin walls by milling with disc cutters, different factors capable of exerting influence on the deviation generated by the residual deformation of the walls were taken into account. A test sample and an experimental research program were designed for the purpose of obtaining an empirical mathematical model. The empirical mathematical model highlights the magnitude of the influence exerted by different input factors on the disc cutter milling process regarding the size of the deviation from the form, and the correct position of the wall or thin part, in the case of a test sample workpiece made of an aluminum alloy. Input factors considered were cutting speed, feed rate, cutter thickness, wall or part thickness, thin wall length, and height. To rank the input factors whose increase leads to an increase in shape deviation, the values of the exponents attached to the factors in question in the empirical mathematical model of the power-type function were taken into account. It was found that the values of the exponents are in the order 0.782 > 0.319 > 0.169 for wall height, feed rate, and wall width, respectively. It was thus established that the strongest influence on the residual deformation of the thin wall is exerted by its height.
在某些情况下，工业生产实践要求用金属工件制造厚度小于一毫米的壁或部件。此类部件或壁可通过使用盘形铣刀进行铣削加工制成。这种加工方法会导致产生残余应力，这些残余应力会使部件或薄壁出现弯曲形式偏差。为了评估金属材料通过盘形铣刀铣削制造薄壁的适用性，考虑了能够对壁的残余变形所产生的偏差产生影响的不同因素。为了获得一个经验数学模型，设计了一个测试样本和一个实验研究方案。该经验数学模型突出了在由铝合金制成的测试样本工件的情况下，不同输入因素对盘形铣刀铣削过程在形状偏差大小以及壁或薄壁正确位置方面所产生的影响程度。所考虑的输入因素有切削速度、进给速度、刀具厚度、壁或部件厚度、薄壁长度和高度。为了对那些增加会导致形状偏差增大的输入因素进行排序，考虑了幂函数型经验数学模型中与相关因素相关的指数值。结果发现，对于壁高、进给速度和壁宽，指数值的顺序分别为0.782 > 0.319 > 0.169。因此确定，对薄壁残余变形影响最大的是其高度。
