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钛合金属难加工材料,其深孔加工的难度更为突出,加工质量不易保证。本文通过实验对比,对加工钛合金大口径深盲孔中出现的偏孔、切屑堵塞、切削振动、刀具破损等主要问题进行了分析,提出了解决办法,得出了切削用量的优化参数。由于钛合金的化学亲和作用,深孔加工刀具的导向条表面易于粘附,结果拉伤已加工表面,造成表面粗糙度上升。加大导向条与孔壁的间隙虽可减少导向条表面的粘附,但同时会引起切削振动的加剧。针对这一矛盾,本文着重对加工刀具的导向条分布、导向条与孔壁的间隙以及导向条的选材方面进行了探讨,提出了以非金属导向条代替硬质合金导向条进行钛合金深孔精加工的方法,使得已加工表面的粗糙度大大降低。这些研究结果对实际加工具有一定的指导作用。
Titanium alloy is difficult to process materials, the difficulty of deep hole processing is more prominent, processing quality is not easy to guarantee. In this paper, the main problems of hole offsetting, chip blocking, cutting vibration and tool breakage in the machining of large diameter deep blind holes of titanium alloy are analyzed by experiments. The solutions and the optimization parameters of cutting amount are obtained. Due to the chemical affinity of the titanium alloy, the surface of the guide strip of the deep-hole machining tool is apt to adhere to the surface of the machined surface, causing the surface roughness to increase. Increasing the gap between the guide strip and the hole wall can reduce the adhesion of the guide strip surface, but at the same time, the cutting vibration will be aggravated. In view of this contradiction, this article focuses on the distribution of the guide bar, the clearance between the guide bar and the hole wall and the selection of the guide bar. The article proposes to replace the hard alloy guide bar with the non-metal guide bar for the titanium alloy deep hole Finishing method, making the rough surface roughness has been greatly reduced. The results of these studies on the actual processing has a guiding role.