一种带螺旋骨架抗冲击的药芯复合钎料饼及其制备方法，钎料饼包括窄带药芯钎料与窄带材料，窄带药芯钎料包括钎料外层和填装在钎料外层内的钎剂药芯，钎料外层按重量份数，包括44～46份的Ag，24～26份的Zn和28~30份的Cu，并由按上述比例配好的Ag、Cu、Zn制得的带状钎料旋转卷制成具有螺旋搭接缝的管状结构，钎剂药芯包括银钎剂药芯，窄带材料为铜镍合金；本发明将窄带药芯钎料和窄带合金连续间隔缠绕在一起，并相互卡接成盘状，使得具有较好的刚性和结构稳定性，钎焊时银铜锌钎料与部分CuNi合金反应生成了CuNiAgZn合金，可提高钎缝强度且焊后留下螺旋状铜镍合金隔离带，能大幅缓释应力，大大提高了硬质合金工具的抗冲击性能。

Provided are an anti-impact flux-cored composite solder cake with a spiral framework and a preparation method thereof. The solder cake comprises a narrow-band flux-cored solder and a narrow-band material. The narrow-band flux-cored solder comprises a solder outer layer and a soldering flux core filling the solder outer layer. The solder outer layer comprises, by weight, 44-46 parts of Ag, 24-26 parts of Zn and 28-30 parts of Cu, and a tubular structure with a spiral lap seam is formed by rotating and rolling a belt-like solder prepared through Ag, Cu and Zn in proportions. The soldering flux core comprises a silver soldering flux core. The narrow-band material is a Cu-Ni alloy. The narrow-band flux-cored solder and the narrow-band alloy are continuously wound together at intervals and clamped to each other to be in a disc shape, so that good rigidity and structural stability are achieved; in the soldering process, the Ag-Cu-Zn solder reacts with part of the Cu-Ni alloy to generate a Cu-Ni-Ag-Zn alloy, the soldering seam strength can be improved, a spiral Cu-Ni alloy isolating belt is reserved after welding, stress can be slowly released to a great extent, and the impact performanceof a hard alloy tool is greatly improved.