The broach of new-style hard alloy that OGS company develops recently, can machine L/D=20 ～ the alveolus of exceeding operational depth of 26. Main characteristic: Use 3 chamfer special slot, core is thick bigger, groovy cut area is larger, can make sure broach has enough tigidity; Deep aperture treatment must adopt section to machine, cut bits for what machine every time below the look as far as possible, groovy length is shorter, already ensured the tigidity of the tool; Cutting blade classics pours arris processing, can reduce axial force, rise cut function; Base material is imperceptible grain hard alloy, via TiAIN coating processing, wearability rises further. If φ 15mmFHL broach processes HPM38(53HRC) data, hole depth 40mm (L/D=26) , this is treatment of alveolus of a kind of exceeding operational depth, the service life of FHL broach obtains treatment more than 90 aperture, general broach cannot reach this one level at all. CNC Milling