ation Without oil filling Shaft variant designed B3HH-18-C Bevel-helical gear unit B3

Flender/Flender Gear Units/Bevel-helical gear unit B3

proved not to be optimal for cemented carbide blades because in this case typically ank wear patterns appear. disadvantage of the 2F concept is that the quality of the once-only deposited coating changes during dry cutting. As result, the more often the blade is reground, the more marked is the scatter in the service time that can be obtained between two re-sharpening operations. Special Features of Three-Face Grinding (3F) When proling and regrinding, three surfaces are ground, namely the two relief surfaces and the front face. Depending on the work piece involved, the face is ground at differing angles and positions which are optimized for the cutting process (see Fig. 6.. Since changes to the technological angles entail change in the form of the cutting edge, Fig. 6.9 Graphic representation of the calculated blade geometry. 1 desired prole in cutting plane 2 form of the cutting edge at the blade 3 blade shank6.2 Cutting of Spiral Bevel Gears 2 specialized software is required to optimize the technological angles and the form of the cutting edge independently of each other. Given the many advantages in dry cutting operations, the 3F concept has prevailed in wide areas of bevel gear manufacture. It uses cemented carbide blades requiring new coating after each re-sharpening operation. The blade is therefore always in brand-new condition such that there is no scatter in the service times. The coating completely encloses the cemented carbide blade, protecting it against cobalt wash- out and thermal inuences and signicantly reducing wear on the relief surfaces. Also new fully coated 2F blades achieve 2 times higher tool life before re-sharpening in comparison to only front face coated blades. The thin hard layer of the full coating causes light rounding of the cutting edge, diminishing the risk of micro-chipping. Stick Blade Cutter Heads with 2 Blades per Group for Single Indexing These cutter heads for face milling (FM) operate without roughing or middle blades