Hollow drill bit has expanded the advent of the dhd drill bit cutting range of use of relatively small power can deep hole processing large hole, also can do the size of the hollow drill is very big, only used on cutting edge better or the best steel, not only reduces the manufacturing cost, and put on the processing way previously thought impossible to become possible. Blue steel tools in henan province science and technology co., LTD., has been trying to study macroporous technical problems of deep hole processing, not only small specifications of high-speed tool steel hollow drill was designed and developed and formed large quantities of production capacity, in steel structure, sheet metal and railway has played a large role, in addition, development and design of the large size of high speed steel and carbide hollow drill bit, someone according to the role of the drill bit is also called nesting bit or core bit.
Our technical staff developed hollow drill started in 1985, pass through many detours, failed many times, in 1989 forced points crumbs measures after the successful development, due to the devices do not form a complete set of units used in China, there has been no mass production. In 1998 units of generic foreign drilling machine is successful, we with matching and gradually increase the number of the production. Now in addition mining dth bit to production outside the special drilling machine using hollow drill, also produce on general equipment using the large size of hollow drill, also some people called nesting knife. Hollow drill bit has expanded the advent of the cutting range of use of relatively small power can deep hole processing large hole, also can do the size of the hollow drill is very big, only used on cutting edge better or the best steel, not only reduces the manufacturing cost, and put on the processing way previously thought impossible to become possible. Blue steel tools in henan province science and technology co., LTD., has been trying to study macroporous technical problems of deep hole processing, not only small specifications of high-speed tool steel hollow drill was designed and developed and formed large quantities of production capacity, in steel structure, sheet metal and railway has played a large role, in addition, development and design of the large size of high speed steel and carbide hollow drill dth rock bit bit, someone according to the role of the drill bit is also called nesting bit or core bit. Small specifications of the hollow drill usually done with high-speed tool steel, the range of 16 - phi phi is roughly 50. We use the high speed tool steel with M2, M35 and three kinds of high performance, to adapt to the different cutting conditions, respectively. Phi is more than 50 we advocate to do with hard alloy material, cemented carbide with welded and machine clamp type two kinds, we suggest that the large size of the hollow drill using carbide indexable insert machine clip, this is beneficial to reduce the cost of production, save raw materials, improve work efficiency, give full play to the superior carbide blade cutting performance.