Abstract
When precision cutting titanium alloy, the cutting part of cutting tool is mainly concentrated in the cutting edge area, so there is a strong emphasis upon the cutting edge’s geometric parameters. Studies have found that putting a micro-texture on the cutting surface can reduce the cutting force. This article looks at the milling force involved in cutting titanium alloy with a micro-textured ball-end milling cutter with different shaped cutting edges. First, a milling model relating to different cutting edges is established based on the traditional model of milling force. Then, the effects of different cutting edge geometry parameters and micro-texture parameters on milling force are simulated and tested using a finite element method. With milling force serving as the evaluation index, the optimum micro-texture parameters for a blunt circular cutting edge are a micro-pit diameter of 40 μm, a distance between micro-pits of 175 μm, a distance from the cutting edge of 110 μm, and a blunt circle radius of 60 μm. For a negative chamfer edge, the optimum parameters were a micro-pit diameter of 50 μm, a distance between micro-pits of 175 μm, a distance from the cutting edge of 120 μm, an edge width of 200 μm, and an edge angle of 10°.
Highlights
Titanium alloy is one of the most important metals used in 21st-century society
The results showed that the cutting force increases gradually and decreases as both the negative chamfer angle and negative chamfer width increase
In view of the above, it can be seen that shape of the cutting edge and micro-texture parameters cannot be ignored when seeking to improve the machinability of titanium alloy and reduce the associated cutting force
Summary
Titanium alloy is one of the most important metals used in 21st-century society. As science and technology have developed, the global demand for titanium alloy and its range of applications have increased. A range of parameters, including the diameter of the individual micro-pits, the distance between them, their distance from the cutting edge and their depth, will all have a different effect on the cutting force and cutting temperature during machining. Yang[13] tried machining titanium alloy after adding a micro-texture to the tool face and found that the required cutting force was significantly reduced. In view of the above, it can be seen that shape of the cutting edge and micro-texture parameters cannot be ignored when seeking to improve the machinability of titanium alloy and reduce the associated cutting force. The influence of these two factors on the cutting of titanium alloy has seldom been studied, despite the obvious advantages of obtaining an optimal cutting edge shape and micro-texture. The depth of the micro-pits is not directly considered as an influencing factor because it is implicitly captured by the diameter
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