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Abstract In order to explore the application of brazing technology in the manufacture of diamond bit. Fabrication technology of brazed diamond bit was introduced in this paper on the base of analyzing advantages and disadvantages of brazing,electroplating and hot-pressing method respectively. Three types of thin wall diamond bits were manufactured with Ni-Cr brazing filler. A laboratory drilling test was carried out on those new monolayer diamond bits. The drilling materials were concrete, reinforced concrete and granite. The tesI results showed that sintering temperature, composition and content of solder additive played an important role in the performances of diamond bit;A diamond bit had the best performance when it was sintered at 9 80 oC:some additional low melting point metals such as Cu Alloy can improve the wettabilitv between diamond and matrix obviously. The drilling test results indicated that brazed diamond bit had superiorities of good diamond exposure, better sharpness and longer lifespan compared with the two conventional kinds. And it meant this brazing technology used in the development and application of diamond bit had important significance.
In order to explore the application of brazing technology in the manufacture of geological diamond drill bits, this paper introduces the advantages and disadvantages of brazing, electroplating and hot pressing methods, and introduces the manufacturing process of brazed diamond drill bits. -Cr alloy brazing material, thin-walled drill bit with three specifications: Φ35 mm, Φ50mm, Φ70mm; indoor drilling test was carried out on the prototype drill bit, and the drilling materials were concrete, reinforced concrete and granite. It has been found that the sintering temperature and the composition and content of the additive in the brazing material have a very important influence on the performance of the diamond bit. The performance of the bit is best when the sintering temperature is 980oC. The addition of a low melting point Cu alloy can significantly improve the brazing material and the matrix. Invasiveness. The drilling results show that the brazed geological diamond drill bit has the advantages of high diamond cutting edge, good drilling time and long service life. This technology has important significance in the development and application of diamond bit field. (Diamond and Abrasives Engineering, 2009, Issue 1)