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Comparison of the machinability of titanium alloy forging and powder metallurgy materials

机译:钛合金锻件与粉末冶金材料切削性能的比较

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摘要

In this paper, Ti-6Al-4V powder metallurgy (PM) material was prepared with hot isostatic pressing technology. In order to compare the machinability of the Ti-6Al-4V forging and PM materials, cutting experiments of Ti-6Al-4V forging and PM materials were done using a grooved tool involved in tool wear mechanisms, tool life, cutting temperature, cutting forces, and chip formation. In the machining of the PM material, chipping wear of the cutting tool became more severe due to the more severe microfluctuation of cutting forces, and adhesive wear turned to be slighter because of the influence of void on the tool-chip interface friction. Compared with the cutting tool average flank wear (VB) in the machining of the two materials, the tool life in the machining of the PM material was longer than that of the forging material. Taking into consideration cutting forces and cutting temperature, the better machinability was attributed to the smaller cutting forces, but the cutting temperature of the PM material was slightly higher than that of the forging material. In terms of the chip morphology, the void in the PM material made the lamella structure of the back surface more uniformly distributed and made the deformation coefficient greater.
机译:本文采用热等静压技术制备了Ti-6Al-4V粉末冶金材料。为了比较Ti-6Al-4V锻件和PM材料的切削性能,使用带槽工具对Ti-6Al-4V锻件和PM材料进行切削实验,涉及刀具的磨损机理,刀具寿命,切削温度,切削力,以及切屑形成。在PM材料的加工中,由于切削力的更严重的微波动,切削工具的切屑磨损变得更严重,并且由于空隙对工具-切削刃界面摩擦的影响,粘合剂的磨损变得更小。与两种材料加工中切削刀具的平均侧面磨损(VB)相比,PM材料加工中的刀具寿命长于锻造材料。考虑到切削力和切削温度,切削力越小,切削性越好,但PM材料的切削温度比锻造材料的切削温度略高。就切屑形态而言,PM材料中的空隙使背面的薄片结构更均匀地分布并且使变形系数更大。

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