【作者】 付强；

【导师】 傅玉灿；

【作者基本信息】 南京航空航天大学 ， 机械制造及其自动化， 2008， 硕士

【摘要】 钛合金切削加工技术是钛合金零件制造中不可缺少的加工手段之一,但一直面临着切削效率低、刀具寿命短、加工成本高等问题。钛合金热氢处理技术可以改变室温下钛合金的力学性能和物理性能,从而改善钛合金切削加工性能。本文以经过热氢处理的TC4钛合金为研究对象,对氢致切削加工性改善机理进行了研究。本文重点从切削力、切削温度以及刀具磨损角度研究了氢致TC4钛合金切削加工改性。首先利用Kistler测力仪和自然热电偶法对置氢TC4钛合金的切削力和切削温度进行了测量,并且对置氢TC4钛合金进行了金相分析和显微硬度观察。通过上述试验,分析研究了置氢工艺对置氢TC4钛合金切削加工性的影响,确定了一种较合适的置氢工艺和置氢量范围。对在确定置氢工艺条件下得到的置氢TC4钛合金进行切削加工性试验,发现TC4钛合金中加入适量的氢可以改善其切削加工性能,降低切削温度和切削力,并且氢致改性与切削用量有密切关系;同时结合X-射线能谱(XRD)和电镜(SEM)分析,证明适量的氢可以较明显的改善刀具磨损状况,提高刀具寿命。更多还原

【Abstract】 The cutting machining technology of titanium alloys is an indispensable means of the machining of titanium alloys component, but the processing has been faces with the problem of cutting inefficiency, short cutting life, high processing cost and so on. Thermohydrogen treatment (THT) of titanium alloys can change the mechanical and physical properties of titanium alloys under room temperature, thereby, improving the performance of cutting machining. Taking the hydrogenated TC4 titanium alloy as the research object, the improvement mechanics of hydrogen deduced cutting performance was researched in this paper.The main work is to explore the improvement of hydrogen deduced cutting performance of TC4 titanium alloy by cutting force, cutting temperature and cutting-tool wear. At first, the cutting force and cutting temperature of the hydrogenated TC4 titanium alloy was obtained by Kistler dynamometer and natural thermocouple method, as well as the metallurgical structure and microhardness. Based on the above experiment researches, the effect of THT technology on the hydrogenated TC4 titanium alloy was analyzed, which confirmed an appropriate technology and hydrogen content.Through the cutting experiments of the hydrogenated TC4 titanium alloy by specified THT technology, result shown that presence of appropriate hydrogenation in the TC4 titanium alloy could improve the cutting performance, reduce the cutting force and temperature, and it also indicated that there were close relation to hydrogen deduced cutting performance and the quantity used in cutting. On the analysis of the XRD and SEM, it is verified that the cutting-tool wear condition and cutting-tool life are improved by appropriate hydrogenation.更多还原