Cone connection small diameter ball tooth bit is at the beginning of this century in the market gradually appeared in a drill bit products, its manufacturing technical requirements, drilling performance, market sales price, etc. are better than a-shaped sheet bit. At present, the small diameter ball tooth drill bit used in the light rock drill in the domestic market is mainly 38mm-42mm in diameter and 5 teeth/4 teeth, with an annual output of about 22 million. The use of ball teeth is mainly the size of 0812, 0913, etc. The amount of single bit alloy is about 50-55g, and the annual alloy consumption is about 1600 tons. Cemented carbide used in Wenzhou Yueqing, Hunan Zhuzhou and other places to choose the main products.
In addition, the brazing tool industry exports 32mm-41mm in diameter every year, with about 1.2 million small diameter ball tooth brazing bits dominated by 6 balls, 7 balls and 9 balls. The size of the used ball teeth is 0711g, 0812g, etc., the amount of single drill bit alloy is 40-45g, and the annual consumption of alloy is about 40-45 tons. The hard alloy used is mainly selected from enterprises in Zhuzhou, Hunan, Wuxi, Jiangsu and Qianjiang, Hubei.
In the past ten years, the small diameter ball tooth drill bit has been on the rise, which has replaced most of the straight sheet carbide drill bit and become the main type of drill bit used in the air leg rock drill. At present, China's highway and railway tunnel construction is still using a large number of air-leg rock drills, so the market share of this drill bit will continue to increase.
