亚微观倒棱切削刃对硬质合金刀片切削性能的影响特性研究

Influencing characteristic of submicroscopic chamfering cutting edge on the cutting property of cemented carbide insert

为了研究硬质合金刀片亚微观切削刃口形式对其切削性能的作用机制,针对断续切削过程中硬质合金刀具存在容易崩刃破损和脆性断裂等问题,选用两种不同牌号的硬质合金可转位刀片分别在多种亚微观刃口结构条件下进行断续切削实验,应用三维受力分析仪结合高速摄影机对切削过程中的冲击和切削力进行数据监测与收集,结合图形统计分析方法研究亚微观倒棱刃口对硬质合金刀片的强化作用机理,从而揭示不同切削刃口几何参数对硬质合金刀具使用寿命的影响规律,提出倒棱刃口参数与进给量的曲线化关系。研究结果表明:大进给量f条件下应选取较大的临界夹角βC,同时,倒棱夹角β要大,倒棱宽度L要小;反之,在小进给量f条件下,临界夹角βC和倒棱夹角β要小,倒棱宽度L要大。研究可为硬质合金可转位刀片的强化设计提供数据和技术支撑。

In order to study the action mechanism of micro cutting edge form of carbide insert on the cutting performance,aiming at the problems of tipping and brittle fracture of carbide insert during interrupted cutting,interrupted cutting experiments are carried out using two different grades of cemented carbide indexable inserts under the condition of multiple submicroscopic structures of cutting edge.The three dimensional stress analyzer and high-speed camera are used to data monitoring and collection of impact and cutting force in the cutting process.Then the strengthening effect mechanism of the micro chamfering edge on the cemented carbide insert is researched combining with graphic statistical analysis method with the goal of revealing the influence rule of cutting edge geometry parameters on the blade life,proposing the curvilinear relationship between chamfering edge parameters and feed rate.The results prove that the larger critical angleβC,chamfer angleβand the smaller chamfering width Lshould be selected under the condition of large feed rate f.Conversely,the smaller critical angleβC,chamfer angleβand the larger chamfering width Lhave better performance under the small feed rate f.The results can provide data and technical support for the strengthening design of cemented carbide indexable insert.