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我队在机掘坑道的施工中，普遍使用硬质合金钎头，但钎头消耗多，使用寿命短，费用大。如从我们在一个矿区施工的两年情况看，每进尺1米就消耗钎头2.4—2.5个；钎头平均使用寿命约10米；每进尺1米的钎头费用为24.10元，仅钎头一项，就占油料、火工材料、钢钎等主要材料费的三分之一以上。为什么钎头损坏那么严重？经我们对493个报废钎头进行分析统计表明：钎头终径为40毫米，钎头残留刃高6—7毫米，而钎头锥体变成六角锥台，无法继续使用的有157个，钎刃损坏的有308个，其中钎刃崩一角的有156个，崩两个角的有41个，整块合金片脱落的有43
My team in the excavation tunnel machine construction, the common use of carbide drill bit, but the drill tip consumption, short service life, costly. For example, from the two years of construction in a mining area, 2.4-2.5 bits of solder are consumed per 1 meter of footage; the average service life of solder bits is about 10 meters; the cost of a drill for every 1 meter of drill is 24.10 yuan; One, it accounts for more than one-third of the cost of fuel, firework materials, steel brazing and other major materials. Why is the bit damaged so badly? Analysis of 493 scraps made by us shows that the final diameter of the drill head is 40 mm and the residual blade height of the drill head is 6-7 mm, while the drill bit cone becomes a hexagonal frustum, 157 can not continue to be used, Broken blade edge damage 308, of which brazing edge collapse of the corner 156, collapse two corner of 41, the whole piece of alloy off 43