Resources Contact Us Home
Method of, and apparatus for manufacturing a gear with a central through hole

Image Number 5 for United States Patent #5516376.

A hardened surface layer is formed in the region of inner and outer surfaces of a hollow material having a central through hole, then the hollow material is hot-forged into a hollow gear-like forged body by a forging die having a first die element with a piercing punch entering into the central through hole of the hollow material from one side thereof and having a second die element with a piercing punch entering into the central through hole of the hollow material from another side thereof. The forging die forms teeth of the gear on the outer side of the hollow material while producing an annular flash in the central through hole of the hollow material between the piercing punches. A distance between the piercing punches in a closed condition of the forging die defines a thickness of the annular flash which is 0.3 mm or more and no greater than 1.3 times (130%) of a depth of the hardened surface layer. After that, the annular flash is removed from the forged body, and thermal refining is implemented to the forged body by quenching and tempering.

  Recently Added Patents
Sensor for high pressure processing of articles
Method for scroll bar control on a touchpad and touchpad with scroll bar control function
Refillable material transfer system
Efficient source of infeasibility identification in timed automata traces
Method and system for collaborative self-organization of devices
Telecommunications network
  Randomly Featured Patents
Photometry device for camera
Network selection in a WLAN
In situ thermal processing of a hydrocarbon containing formation leaving one or more selected unprocessed areas
Micro diffusion of oxygen for treatment and dispersal of wastewater in a drain field
Method for measuring adherence of a coating on a substrate
Method and system for providing dual magnetic tunneling junctions usable in spin transfer torque magnetic memories
ATM-system adapted three stage switching unit
Fluid bubble eliminator
Cassette ejection mechanism of a cassette tape recorder
Method and apparatus for transmitting signals in a multi-hop wireless communication system