Tool performance and chip control when machining Ti6Al4V and Inconel 901 using high pressure coolant supply
Tool performance and chip control when machining Ti6Al4V and Inconel 901 using high pressure coolant supply
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DOI：
10.1080/10940349808945655
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发表时间：
1998-01-01
影响因子：
2.7
通讯作者：
Ezugwu, EO
中科院分区：
文献类型：
--
作者：
Machado, AR;Wallbank, J;Ezugwu, EO
使用各种几何形状的直级（K20）硬质合金刀片，使用高压冷却剂射流直接在切屑形成的刀具尖端，对Ti6 Al 4V和Inconel 901进行单点连续车削试验。还使用常规冷却剂供应进行了试验以进行比较。试验结果表明，在高压冷却液射流作用下加工钛基合金可以提高刀具寿命，而加工镍基合金时刀具寿命较低。在加工过程中使用高压冷却剂供应通常保持恒定的切削力并减少切屑-刀具接触长度，从而增加刀具边缘处的应力。这种行为往往会加速缺口，这是主要的加工铬镍铁901合金时，导致较短的刀具寿命。当加工Ti6 Al 4V时，这种影响并不明显，其中刀具失效主要是由于过度的后刀面磨损。由于新生成切屑的循环破碎机制，在加工这两种材料时都实现了有效的切屑控制。
Single point continuous turning tests were carried out on Ti6Al4V and Inconel 901 using various geometries of straight grade (K20) cemented carbide inserts using a high pressure coolant jet directed at the tip of the tool where the chip is formed. Trials were also carried out using a conventional coolant supply for comparison. The test results show that improved tool life can be achieved when machining the titanium-base alloy under the high pressure coolant jet while shorter tool life was obtained when machining the nickel-base alloy. The use of high pressure coolant supply during machining generally maintains constant cutting forces and reduces the chip-tool contact length, thus increasing stresses at the tool edge. This behavior tends to accelerate notching that is predominant when machining the Inconel 901 alloy, resulting in shorter tool life. This effect is not obvious when machining Ti6Al4V where the tools failed mainly due to excessive flank wear. Effective chip control was achieved when machining both materials because of the cyclic fragmentation mechanism of the newly generated chip.