硬质合金刀具钎焊后性能变化的研究

Changes in properties of carbide cuffing tools after being brazed

对硬质合金刀具钎焊前后的硬度、裂纹形成及变化、焊缝质量和切削性能等进行了大量的试验研究．结果表明：硬质合金刀具钎焊后硬度下降范围在ＨＲＡ１以内；采用延长钎焊后保温时间和增加补偿垫片均可以减少或避免刀具表面裂纹的产生；对１８ＣｒＭｎＴｉ渗碳淬火齿轮（ＨＲＣ５５～５８）单齿侧刃铣削中钎焊刀具的切削性能同机夹刀具相比无明显差异．

The experimental tests of carbide cutting tools before and after being brazed were performed in terms of hardness, initiation and propagation of cracks, quality of weld and cutting performance. The results show that the reduction in hardness of carbide cutting tools after being brazed is within HRA1, and the initiation of cracks in the surface of cutting tools can be reduced or eliminated by prolonging the holding time for the cutting tools after being brazed and adding shims, while the cutting performance of brazed cutting tools with single cutting edge made of 18CrMnTi is similar to that of fixed machining cutting tool.