Machining characteristics of Ti6Al4V alloy in laser-assisted machining under minimum quantity lubricant
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ORIGINAL ARTICLE
Machining characteristics of Ti6Al4V alloy in laser-assisted machining under minimum quantity lubricant Xiaosheng Luan 1 & Jianbing Meng 1 Hongwei Zhang 1 & Linghui Qu 1
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BingQi Huang 1 & Xiaojuan Dong 1 & Yizhong Hu 1 & Yugang Zhao 1 &
Received: 16 August 2020 / Accepted: 29 October 2020 # Springer-Verlag London Ltd., part of Springer Nature 2020
Abstract Based on laser-assisted machining (LAM) and minimum quantity lubrication machining (MQLM), a processing technology of laser combined minimum quantity lubrication-assisted machining (LAM-MQL) of titanium alloy is proposed, which combines heating, lubrication, and cooling effects. Dry cutting (DC), LAM, MQLM, and LAM-MQL experiments were carried out on TC4 titanium alloy with cemented carbide tool. With the help of metallographic microscope, scanning electron microscope and roughness measuring instrument, the tool flank wear, tool wear morphology, chip morphology, and surface roughness were detected, respectively. Meanwhile, the EDS spectrum analysis of tool wear area was carried out. The results show that compared with DC, LAM, and MQLM, the tool wear, chip shape, and surface quality of the LAM-MQL have been significantly improved. The tool flank wear has been reduced by 49.1%, 20.5%, and 12.9%, and the surface roughness of the workpiece is reduced by 33.7%, 19.9%, and 12.7%, respectively. The titanium alloy chip transforms from a serrated shape to a continuous shape, and no longer has obvious adiabatic shear bands and severe plastic deformation. The failure of the tool is mainly due to the combined effects of bonding wear, oxidation wear, and abrasive wear. Keywords LAM-MQL . Titanium alloy . Tool wear . Chip morphology . Surface roughness
1 Introduction Titanium alloy has excellent characteristics such as low density, high specific strength, high melting point, corrosion resistance, non-magnetic, super memory, and high toughness. It has the reputation of “space metal,” “marine metal,” “all-round metal,” and “future metal” [1–3]. However, titanium alloy is a typical difficult-to-machine material due to its stickiness, toughness, elasticity, and high chemical activity [4–6]. During the cutting process, the high strength of the titanium alloy causes high friction between the tool and the workpiece and generates high heat. This heat cannot be transferred to the workpiece in time or is taken away by the chips and will accumulate in the cutting area to form a cutting temperature of 1000 °C.
* Jianbing Meng [email protected] 1
School of Mechanical Engineering, Shandong University of Technology, Zibo, China
Eventually, it will aggravate the rapid wear and tear of the cutting edge of the tool and generate built-up edge [7]. Traditional pouring cutting uses a large amount of cutting fluid to be poured into the cutting zone, which can effectively reduce the temperature in the cutting zone and reduce the friction between the tool and the workpiece, thereby obtaining higher surface quality and longer tool life [8]. However, the large-scale u
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