Eight-Axis Gear Hobbing Center Highlights Speed, Rigidity
IMTS 2018: Affolter Technologies is showcasing its gear hobbing center AF110 plus, an eight-axis machine with a cutter-spindle speed ranging to 12,000 rpm.
Affolter Technologies, in partnership with its U.S. representative Rotec Tools, is showcasing its AF110 Plus gear hobbing center, an eight-axis machine with a cutter-spindle speed ranging to 12,000 rpm. Built for versatility, precision, power, rigidity and ease of use, the machine is capable of making gears ranging from 1,270 to 17 DP. It cuts spur, helical, frontal, bevel and crown gears.
Available automation systems for part loading and unloading include universal grippers, drum loaders or robot loading, as well as options such as deburring, dry cutting, centering microscopes and oil mist aspiration.The AF71 loader system with two grippers is said to accommodate 24-hour unattended production. While a gear is in the hobbing process, the other gripper in the loader system reaches out for the next part to load.
The company’s Worm Screw Power Skiving (WSPS) technology is also available as an alternative to worm hobbing. In this process, the company says, the workpiece moves faster than the cutter, with two additional spindles ranging up to 12,000 rpm. WSPS is said to combine high speeds with necessary stiffness to enable manufacturers to finish a high-precision worm in only six sec. The technology focuses on small worms with a module ranging to 17 DP.
With so many advances being made in gear grinding technology, where does that leave processes such as hobbing, shaping and shaving? This shop explains its machining methodology.
One core competency that has undergone major change is gear production. Current European law mandates more strict noise control. To meet regulations set forth, Harley-Davidson motorcycles were required to reduce noise output. Anticipating that this would soon become standard in other coun-tries as well, the company modified its transmission to include gear ratio changes and high contact tooth geometry.
To produce high-precision ring gears in low- to mid-volumes, an emerging option is the use of five-axis machining centers. Mitsui Seiki CNC vertical and horizontal machining centers are being used in this application.