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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18~36μm;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30μm增加至55μm,而后刀面磨损量为0.35 mm时,硬化层深度达到了130μm.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.
The effects of milling parameters and tool flank wear on work hardening (surface hardening rate, depth of hardened layer, and hardness distribution of hardened layer) were investigated in the case of end-milling titanium alloy TB6 using a coated carbide tool The results show that the hardening rate remains within the range of 107% ~ 112% and the depth of hardened layer ranges from 18 ~ 36μm under the condition of no tool wear in the experimental parameters. When the milling speed increases , The degree of work hardening will have a more significant reduction phenomenon, and feed and cut depth on the work hardening is not obvious; Tool wear on the work hardening is more significant, when the flank wear less than 0.2 mm, the hardening The depth of the layer increases from 30μm to 55μm with increasing wear, while the depth of the hardened layer reaches 130μm when the flank wear amount is 0.35mm. After the tool wear, the softened region appears at a shallow position below the machined surface, and as the wear amount increases , Softening more and more obvious.