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本文对振动切削形成的金属纤维用自制的超微型拉伸试验机测定其力学性能,观察微观形貌和金相组织。分析了纤维截面积、缺陷及切削速度、振动特性对金属纤维强度的影响。 实验表明,对应于某一定刀具的振动频率和切削深度都存在一个形成纤维的临界转速和有效区间。质量好的金属纤维强度可比原材料高出近一倍,而塑性降低很多,但延伸率仍在1％以上。随着截面积减小,纤维强度增高,塑性下降。刀痕造成的缺口及横向裂纹可能是影响纤维强度和塑性的重要原因。
In this paper, the mechanical properties of the metal fibers formed by vibration cutting were measured by a self-made Tensile Tester, and the microstructure and microstructure were observed. The influence of fiber cross-sectional area, defect, cutting speed and vibration on the strength of metal fiber was analyzed. Experiments show that, corresponding to a certain tool vibration frequency and depth of cut there is a critical speed and effective fiber formation of the interval. Good quality metal fiber strength than the raw material nearly doubled, while a lot of plasticity, but the elongation is still above 1%. As the cross-sectional area decreases, the fiber strength increases and the plasticity decreases. Notches and transverse cracks caused by cracks may be an important factor affecting fiber strength and plasticity.