GEAR HOBS & FORM MILLING CUTTER
FHUSA-TSA hob cutters are produced in multi-axis CNC machines that incorporate the latest technology on profile grinding process. We use the best powder metallurgy steels (PM HSS) and make vacuum heat treatment in house, under an absolute process control. In addition, we strictly control roughness of the flanks and radii of the cutting edge, in order to maximise the performances and keep them optimal along all tool life.
Technical support: hob manufacturing during three generations
FHUSA brand was born in 1944 and accumulates an experience about hobs that few companies can boast of. Working with FHUSA-TSA does not simply mean having a supplier, but a partner to achieve technical solutions. The advice begins already in the quotation phase, always very detailed and with different options. It continues –in the event of an order- with a personalized project.
All new FHUSA-TSA hob drawings present a detailed study obtained in the finished part. If hobbing is prior to another operation (grinding, shaving, skiving…) both hobbed and final profiles are presented. Without any tool knowledge, clients can perfectly assess the result and give their approval or suggest some change.
FHUSA-TSA offers technical support for the determination of the working parameters and conditions. We adapt to the client’s priorities: performance, quality, endurance, economy, delivery time or any combination mentioned above.
Finally, we assist the clients in the maintenance of their tools (sharpening, coating, repair and modification) and we advise for the resolution of technical problems.
| Applications and components | Spur and helical hobbing of external toothed transmissions, gear pumps, rollers, rotors; saw discs, ratchet wheels, etc.; worm wheel hobbing with radial/tangential feed |
| Modules (DP) | Normal module from 0.3 to 40 (Diametral Pitch from DP84 to DP.625) |
| Obtainable profiles | Involute gears/splines, straight flank serrations, parallel keyways and non-involute (chain wheel, timing belt pulley and other toothed transmissions); other external toothed profiles |
| Profile modifications | Semitopping, topping, full radio, protuberance, undercut lugs; involute modifications (tip rilief, crowing, K profile, etc.); shoulders elongated-tooth; chipbreaker; *see table below |
| Hob cutter geometries | Bore/shank monoblock hobs; cylindrical, taper and cylindrical with taper end; single start, multistart and multipitch starts; twin/triple tandem; max. ext. diameter 450mm |
| Gashes/Flutes and sharpening | DIN 8002, multigash and heavy-duty (doublegash); straight/helical sharpening; zero (default) and positive rake angle; aligned teeht (default) and yuxtapposed alternate teeth |
| Materials | High Speed Steel (HSS M35), Powder Metal (PM HSS), intermet MC90, solid carbide |
| Coatings | All common PVD coatings: TiN, Alcrona ® and Altensa ® |
| Bores (mm) | 8, 10, 13, 16, 22, 27, 32, 40, 50, 60, and 80 mm |
| Bores (inches) | 12.70, 15.88, 19.05, 22.23, 25.40, 31.75, 38.10, 44.45, 50.80 and 63.50mm |
| Shanks | All taper and cylindrical shanks are drawn according to client tooling |
| (*) VARIANTS OF THE BASIC RACK FOR INVOLUTE PROFILE TOOLS | |||||
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| 0 – BASIC RACK | A – TOPPING Rk1=0 | B – TOPPING Rk1≠0 | C – SEMITOPPING | D – INVOLUTE MOD. | E – PROTUBERANCE |
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| L – LUGS | J – FULL RADIO | M – TAPERED END | P – RAKE ANGLE | V – SHOULDER | W – CHIPBREAKER |
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Form milling cutters are manufactured with the same technology as the gear hobs, but they are not used in hobbing machines. They have no lead angle and no starts, and they do not work by profile generation. They are mounted on milling machines up to multi-task machining centres. They exactly copy tool profile on the part.
Within the wide world of milling tools, FHUSA-TSA is a specialist in those applications related to the field of transmission elements.
| Applications and components | Rack and worm manufacturing; indexed (even internal) cutting of cylindrical gears, splines, chain sprockets and other toothed transmissions; saw bands; form milling in general |
| Modules (DP) | Modules and Diametral Pitch equivalent to normal pitch from 1mm to 150mm |
| Obtainable profiles | DIN 3972, ISO 8667 and similar racks; DIN 3975 ZK and ZI worms; involute (specific Z) and any spline, serration, toothed pattern or slot obtainable by form tool (with relief angle) |
| Profile modifications | Semitopping, topping, full radio, lugs; any profile defined by points (with rilief angle); asymmetric profiles; *see table for hob cutters |
| Milling cutter geometries | Symmetric/asymmetric disc cutters; solid monoblock (multirow) and discs set (double keyway) rack cutters; cylindrical/taper cutters; max. external diameter 450mm |
| Gashes/Flutes and sharpening | Normal, multigash and heavy-duty (doublegash); straight (single disc and discs set) and helical (monoblock) sharpening; rake angle; normal/yuxtapposed alternate teeth |
| Materials | High Speed Steel (HSS M35), Powder Metal (PM HSS), solid carbide |
| Coatings | All common PVD coatings: TiN, Alcrona ® and Altensa ® |
| Clamping | Same as hob cutters; for specific milling machine tooling, please ask |