Experiment on work hardening of milling TB6
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摘要: 研究了使用涂层硬质合金刀具对钛合金TB6进行端铣加工时，铣削参数以及刀具后刀面磨损量对加工硬化（表面硬化率、硬化层深度以及硬化层硬度分布）的影响，以弄清TB6铣削硬化现象及机理.结果表明，在实验参数范围内，刀具无磨损的情况下，硬化率基本保持在107%~112%范围内，硬化层深度范围为18~36 μm；铣削速度增加时，加工硬化程度会有较为明显的降低现象，而进给量与切深对加工硬化的影响并不明显；刀具磨损对加工硬化的影响较为显著，后刀面磨损量低于0.2 mm时，硬化层深度随着磨损增加从30 μm增加至55 μm，而后刀面磨损量为0.35 mm时，硬化层深度达到了130 μm.刀具磨损后在加工表面下较浅位置出现软化区域，而且随着磨损量的增加，软化越来越明显.Abstract: How the tool wear and milling parameters influence the work hardening in the process of face milling TB6 was studied to figure out the principles of work hardening. The results show that among the parameters selected in the experiments, the work hardening degree ranges from 107% to 112% and the depth of work hardening ranges from 18 μm to 36 μm. The work hardening degree decreases with the increasing of velocity of milling, while the changes of feed and depth of cut show no obvious impacts on it. The amount of flank wear(VB) influences the work hardening a lot. The depth of work hardening changes from 30 μm to 55 μm, when VB increases from 0 to 0.2 mm, while it increases to 130 μm when VB reaches to 0.35 mm. The material softens not deep below the surface and it is more apparent when VB is increasing.
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Key words:
- TB6 /
- microhardness /
- work hardening /
- surface integrity /
- microstructure
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