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
Fabric care compositions comprising front-end stability agents
Transmitting apparatus and retransmitting method
Deflection device for a scanner with Lissajous scanning
Automatic engine oil life determination with a factor for oil quality
Organic light emitting display device and method of manufacturing the same
Deposition apparatus and method for manufacturing organic light emitting diode display using the same
Documentation roadmaps and community networking for developers on large projects
  Randomly Featured Patents
Make-up air energy recovery ventilator
Antibodies and pharmaceutical compositions containing same useful for inhibiting activity of metalloproteins
Optical lens device of image scanner
Bicycle shoe
System and method for modeling a tracking curve of an in vivo device
Outsole for a shoe
Super thin/super thermal ball grid array package
Power supplying device, power supply controlling method, power supply controlling program and network system
Pre-treated carbon based composite material for molten metal
Data pattern synchronizer