Very high speed cutting of Ti-6A1-4V titanium alloy - change in morphology and mechanism of chip formation
Very high speed cutting of Ti-6A1-4V titanium alloy - change in morphology and mechanism of chip formation
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DOI：
10.1016/j.ijmachtools.2012.11.004
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发表时间：
2013-03-01
影响因子：
14
通讯作者：
List, G.
中科院分区：
文献类型：
--
作者：
Sutter, G.;List, G.
研究了Ti-6A1-4V合金在高切削速度和大未切削切屑厚度（0.1 ~ 0.25 mm）条件下的切屑形成。在特定的弹道设置下，使用无涂层硬质合金刀具进行正交切削试验，切削速度从300米/分钟到4400米/分钟（5-75米/秒）。在此速度范围内，提出了切屑产生机理的假设，并通过高速成像系统对切削过程进行了验证。观察到在非常高的速度下，从锯齿状或多或少规则的局部剪切和可能存在的开裂转变为不连续。段0的倾斜度显示为由原始剪切角0产生的，该剪切角0可以通过工具与未切割部分之间的压缩来修改。随着速度的增加，g的最大值为60，之后在非常高的速度下减小到45。与未切削切屑厚度相比，切削速度通过影响切屑的切分频率、剪切角和裂纹长度来决定切屑的形成。切削力随切削速度的增加而显著减小，首先解释为加工硬化-热软化过程的冲突，然后取决于切屑段是否发生变形阶段。(C) 2012 Elsevier Ltd.版权所有。
The chip formation for a Ti-6A1-4V alloy was studied at high cutting speeds combined with large uncut chip thicknesses (0.1-0.25 mm). Orthogonal cutting tests were conducted by using uncoated carbide tools on a specific ballistic set-up with cutting speeds from 300 m/min to 4400 m/min (5-75 m/s). A hypothesis on the mechanism of chip generation is proposed for this speed range validated by highspeed imaging system enabled direct observation of cutting process. A transition, from serrated more or less regular with localized shearing and possible presence of cracking, to discontinuous at very high speed is observed.The inclination of the segment 0, is shown as resulting from the primary shear angle 0 that can be modified by compression between the tool and the uncut part. A maximum value of 60 for g is reached with increasing speed after which it decreases to 45 at very high speed.The cutting speed appears as the most important factor when compared with the uncut chip thickness, in determining the formation of chips by affecting the frequency of segmentation, the shear angles and the crack length.The significant reduction of cutting forces occurring with increases in cutting speed was firstly explained by the conflicting work hardening-thermal softening processes and then depended on whether the deformation phase of the chip segment is occurred. (C) 2012 Elsevier Ltd. All rights reserved.