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江西专用量具刃具厂(现江西量具刃具厂)自1983年开始生产套式空心钻。这种钻头适宜于钻较大直径的孔。已生产的套式空心钻直径规格为50～108mm,近年来也曾生产过直径小至32mm的。图示套式空心钻用整体高速钢制造,齿两侧,即钻头外径1和内径2均有倒锥,端齿内凹约2°,端齿刃带宽1.2mm,后角为6～8°,齿厚为3.5～4.5mm。这种套式空心钻由于是整体的,且齿厚小,几何参数适当,因此,钻削轴向力和扭矩都较镶齿结构的为
Jiangxi Measuring Tool & Cutter Factory (now Jiangxi Measuring Tool & Cutter Factory) has been producing sleeve-type hollow drills since 1983. This bit is suitable for drilling larger diameter holes. Has produced the diameter of the drill sleeve diameter of 50 ~ 108mm, in recent years have produced as small as 32mm in diameter. The illustrated sleeve-type hollow drill is made of high-speed steel as a whole. Both sides of the tooth, that is, the outer diameter of the drill 1 and the inner diameter 2 of the drill have a reverse taper, the end teeth are recessed by about 2 °, the end tooth-edge width is 1.2mm and the relief angle is 6-8 °, tooth thickness of 3.5 ~ 4.5mm. Because of this sleeve-type hollow drill is a whole, and the tooth thickness is small, the appropriate geometry parameters, therefore, the drilling axial force and torque are more than the structure of the inlay