我国岩巷掘进中,从五十年代中期直到现在,基本上都使用仿苏老一字形钎头和 YG15合金片,如图1、图2所示。每年用于镶焊中、小钎头的硬质合金超过1000吨,约占全国硬质合金年产量的三分之一,价值达6000万元以上。出于钎头品种单一,钎头与合金片的儿何结构及参数不合理,材质(包括合金、钢材、焊料、焊剂等)较差,制造工艺和使用技术落后,硬岩平均寿命只有20 Rock tunneling in our country, from the mid-fifties until now, basically use imitation Su-old A-shaped drill bit and YG15 alloy film, as shown in Figure 1, Figure 2 shows. For welding in the annual, small bit more than 1000 tons of cemented carbide, carbide accounts for about one-third of the country’s annual output, the value of more than 60 million yuan. Due to the single type of brazing alloy, the structure and parameters of brazing alloy and alloy flake are not reasonable. The materials (including alloy, steel, solder, flux, etc.) are poor and the manufacturing technology and technology are backward.