硬质合金刀具前刀面刀屑粘焊形成及元素扩散理论模型

Formation of sticking-welding on rake face of carbide tool and its theoretical model of element diffusion

结合菲克第二定律描述了前刀面刀屑的元素浓度分布,采用半无限长模型,建立考虑温度影响的刀屑元素扩散方程;通过分析切削过程中粘焊的形成过程,利用夹紧件和焊接件在不同温度下的扩散分别近似模拟粘焊未产生和产生时在不同温度下的元素扩散情况,探究温度和粘焊对元素扩散的影响;同时,结合扩散试件在不同温度下的元素浓度分布,采用数据拟合软件进行数据处理及参数的确定。研究表明:粘焊的产生并不影响扩散的最终浓度,但在一定程度上影响扩散的进程;随着温度的升高,扩散速率及扩散距离都有相应地增大。研究结果对于从微观层面揭示原子运动规律,进而提高刀具抗粘结破损性能具有重要意义。

Based on the Fick’s second law, the elements concentration distribution of the rake face was described and the semi-infinite length model was used to establish the diffusion equation of the rake face considering the influence of temperature. By analyzing the formation of the sticking-welding during the cutting process, the welded and clamping parts at different temperatures were used to approximately simulate the elements diffusion at different temperatures with or without sticking-welding, so the effects of temperature and sticking-welding on the elements diffusion can be explored. At the same time, combined with elements concentration distribution of the diffusion specimens at different temperatures, data processing and parameter determination were carried out by using data fitting software. The results show that sticking-welding does not affect the final diffusion concentration, but it affects the diffusion process to a certain extent, and with the increase of temperature, the diffusion rate and diffusion distance increase correspondingly, the results are significance for revealing the law of atom movement at microscopic level and improving the anti-adhesion and anti-fracture performance of carbide tool.