钛合金TC11车削已加工表面质量试验研究
发布时间：2018-09-09 15:08
【摘要】：钛合金凭借其优良的机械力学性能广泛应用于航空航天、机械、医疗等领域,特别是航空发动机压气机盘和涡轮盘等零部件。但钛合金作为典型的难加工材料,其切削性能很差,切削温度高、化学活性大、冷硬现象严重以及刀具易磨损,严重影响零件的已加工表面质量,降低了航空零部件的服役性能及使用寿命。为了解决以上问题,本文主要针对钛合金TC11进行了车削表面质量及刀具磨损研究,分别对表面粗糙度、加工硬化、残余应力以及表层微观组织进行了重点分析,为切削参数和刀具优化提供一定的理论基础,从而实现钛合金TC11高质高效加工。具体研究内容如下:设计单因素钛合金车削试验,采用涂层与非涂层硬质合金刀具在常规冷却和高压冷却两种条件下切削加工,研究切削速度,进给量以及冷却条件对刀具磨损的影响规律,对比分析刀具磨损形式及形成机理。采用白光干涉仪对表面粗糙度进行检测分析,研究不同冷却条件下,切削参数切削速度、进给量以及不同时间刀具磨损对表面粗糙度的影响规律,对比非涂层与涂层刀具表面粗糙度随切削参数的变化情况。通过SEM扫描观察已加工表面,分析切削表面缺陷类型及形成原因。考虑刀具磨损进行已加工表面加工硬化研究,详细分析加工硬化产生原因及其影响因素。采用涂层硬质合金刀具切削,研究切削速度和进给量对表面加工硬化程度及硬化层深度范围的影响规律,对比不同冷却条件下切削速度对加工硬化的影响规律。对已加工表面残余应力及表层微观组织变化情况进行研究。采用X射线衍射仪检测已加工表面残余应力性质及大小,详细分析不同性质残余应力产生机理,对比涂层与非涂层刀具对表面残余应力的影响,研究不同冷却条件下,切削参数及刀具磨损对表面残余应力的影响规律。采用SEM扫描电子显微镜观察表层塑性变形程度和塑性变形层深度,对比分析切削参数、冷却条件以及刀具磨损对其影响规律,观察分析表层晶粒拉伸、扭曲变化规律。
[Abstract]:Titanium alloy is widely used in aerospace, machinery, medical and other fields, especially in compressor disk and turbine disk of aero-engine, because of its excellent mechanical properties. In order to solve the above problems, the surface quality and tool wear of titanium alloy TC11 are studied in this paper. The surface roughness, work hardening, residual stress and surface microstructure are analyzed in detail. The specific research contents are as follows: Designing single factor titanium alloy turning test, using coated and uncoated cemented carbide tools cutting under the conditions of conventional cooling and high pressure cooling, studying cutting speed, feed rate and cooling. The surface roughness was measured and analyzed by white light interferometer. The influence of cutting parameters, cutting speed, feed rate and tool wear at different time on surface roughness under different cooling conditions was studied. The surface roughness changes with cutting parameters. The machined surface was observed by SEM scanning, and the types and causes of surface defects were analyzed. The machined surface was hardened by considering tool wear. The causes and influencing factors of machined surface hardening were analyzed in detail. The influence of degree and feed rate on the degree of surface hardening and the depth range of hardened layer was studied. The influence of cutting speed on the degree of surface hardening under different cooling conditions was compared. The mechanism of residual stress in different properties is analyzed in detail, and the influence of coating and uncoated cutting tools on the surface residual stress is compared. The influence of cutting parameters and tool wear on the surface residual stress under different cooling conditions is studied. The effects of cutting parameters, cooling conditions and tool wear on the cutting parameters were observed and analyzed.
【学位授予单位】：哈尔滨理工大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TG51
本文编号：2232738
[Abstract]:Titanium alloy is widely used in aerospace, machinery, medical and other fields, especially in compressor disk and turbine disk of aero-engine, because of its excellent mechanical properties. In order to solve the above problems, the surface quality and tool wear of titanium alloy TC11 are studied in this paper. The surface roughness, work hardening, residual stress and surface microstructure are analyzed in detail. The specific research contents are as follows: Designing single factor titanium alloy turning test, using coated and uncoated cemented carbide tools cutting under the conditions of conventional cooling and high pressure cooling, studying cutting speed, feed rate and cooling. The surface roughness was measured and analyzed by white light interferometer. The influence of cutting parameters, cutting speed, feed rate and tool wear at different time on surface roughness under different cooling conditions was studied. The surface roughness changes with cutting parameters. The machined surface was observed by SEM scanning, and the types and causes of surface defects were analyzed. The machined surface was hardened by considering tool wear. The causes and influencing factors of machined surface hardening were analyzed in detail. The influence of degree and feed rate on the degree of surface hardening and the depth range of hardened layer was studied. The influence of cutting speed on the degree of surface hardening under different cooling conditions was compared. The mechanism of residual stress in different properties is analyzed in detail, and the influence of coating and uncoated cutting tools on the surface residual stress is compared. The influence of cutting parameters and tool wear on the surface residual stress under different cooling conditions is studied. The effects of cutting parameters, cooling conditions and tool wear on the cutting parameters were observed and analyzed.
【学位授予单位】：哈尔滨理工大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TG51
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