Gear cutter with radial adjustability of square or rectangular stick blades
View Patent ↗A bevel gear manufacturing face cutter head ( 2 ) for face hobbing and face milling. The cutter head has blade positioning slots ( 20 ) having a four-sided shaped cross-section and positive blade seating surfaces ( 22, 24 ). The cutter head also has the capability to clamp cutting blades ( 8 ) tight to the positive blade seating surfaces and to adjust the cutting blades radially after they are pre-clamped and axially located.
1. A bevel gear face cutter head for face hobbing and face milling of bevel and hypoid gears, said cutter head being generally disc-shaped and rotatable about a cutter head axis, said cutter head comprising:
a top surface and a bottom surface,
one or more cutting blade positioning slots arranged in said cutter head with each of said blade positioning slots extending between said top and bottom surfaces and with each of said blade positioning slots defining a four-sided shaped cross-section,
said cutting blade positioning slots each having at least one blade seating surface extending between said top and bottom surfaces,
said at least one blade seating surface having a modified shape and extending from said top surface to said bottom surface wherein said modified shape departs from the straight line shape of a continuous straight seating surface extending from said top surface to said bottom surface,
wherein the cutter head is capable of clamping a cutting blade having a four-sided shaped cross-section to the at least one blade seating surface such that the blade is pre-clamped and axially located and is capable of thereafter having the radial location of the blade tip adjusted by an increase of the torque of a clamp screw located in the area of the modified portion of the blade seating surface.
2. The cutter head of claim 1 wherein said modified shape comprises:
a first portion extending from one of said top or bottom surface to a predetermined location between said top and bottom surfaces, said first portion having a first shape,
a second portion extending from said predetermined location to the other of said top or bottom surface, said second portion having a shape such that the shape of said first portion and the shape of said second portion together do not describe a continuous straight line extending from said top surface to said bottom surface.
3. The cutter head of claim 2 wherein the shape of at least one of said first portion and said second portion is curved.
4. The cutter head of claim 2 wherein the shape of at least one of said first portion and said second portion is straight.
5. The cutter head of claim 2 further including one or more clamp screws.
6. The cutter head of claim 5 comprising one clamp screw positioned to exert a force at said predetermined location.
7. The cutter head of claim 5 comprising two clamp screws with a first clamp screw positioned to exert a force on said first portion and a second clamp screw positioned to exert a force on said second portion.
8. The cutter head of claim 5 comprising two clamp screws with a first clamp screw positioned to exert a force on a corner of a cutting blade and a second clamp screw positioned to exert a force on said first portion or said second portion.
9. The cutter head of claim 1 wherein said one or more cutting blade positioning slots defines a generally square or rectangular shaped cross section.
10. The cutter head of claim 9 wherein said one or more cutting blade positioning slots include two blade seating surfaces.
11. The cutter head of claim 10 further including at least one clamping screw positioned to exert a force against one of said two blade seating surfaces.
12. The cutter head of claim 11 wherein the other of said two blade seating surfaces is unmodified.
13. The cutter head of claim 1 further including angular clamp blocks.