硬质合金高温性能对TC4钛合金高速铣削的影响研究
2020-12-23
作者：林凤添
单位：厦门金鹭特种合金有限公司
摘要：在高速铣削加工钛合金的过程中，硬质合金刀具承受较高的切削温度，导致刀具快速磨损和失效。通过添加TaC（NbC）难熔金属碳化物制备新型WCCo基硬质合金，采用高温硬度计检测新型硬质合金的高温硬度和高温断裂韧性，均较传统WCCo基硬质合金有提升。将添加TaC（NbC）的新型硬质合金材料制备成整体硬质合金立铣刀，并进行高速铣削钛合金TC4对比试验。结果表明：添加TaC（NbC）的硬质合金刀具，可以有效提高刀具的耐磨性，降低裂纹的出现和扩展，从而提高硬质合金刀具在高速铣削钛合金时的使用寿命。
关键词：TC4钛合金；硬质合金立铣刀；高温性能；刀具磨损
中图分类号：TG711文献标志码：ADOI：10.3969/j.issn.1000-7008.2020.12.007
Research on Effect of High Temperature Performance of
Cemented Carbide on High Speed Milling of TC4 Alloy
Lin Fengtian
Abstract:In the process of highspeed milling Titanium alloy，due to its low thermal conductivity，the milling tool needs to bear higher temperature，which causes the tool life will to be reduced if the hardness and fracture toughness of the tool material are not maintained at high temperature. To solve this problem，a new type tool of cemented carbide based on WCCo is prepared by adding TaC(NbC) refractory metal carbides. Compared with the traditional WCCo based cemented carbide，the high temperature hardness and high temperature fracture toughness of the new cemented carbide are tested by high temperature hardness tester，which are greatly improved.The contrast test of highspeed milling Titanium alloy TC4 shows that the hightemperature hardness and fracture toughness of the new material are retained that it can improve the high temperature wear resistance of the tool effectively，reduce the appearance and propagation of cracks，and thus improve the tool life of the integral end mill under the condition of highspeed milling titanium alloy.
Keywords:TC4 Titanium alloy；cemented carbide tool；high temperature performance；tool wear