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
Triazine ring-containing polymer and film-forming composition comprising same
System and method for associating financial transaction data with user's project data
Aluminum galvanic cell
Dynamic learning method and adaptive normal behavior profile (NBP) architecture for providing fast protection of enterprise applications
Use of LPA for encouraging pregnancy, and fertility agent
Tool box
Memory management configuration
  Randomly Featured Patents
Measuring device
SQUID Canister with conical coupling cavity
Nortropane derivatives
Pediculicidal and ovacidal treatment compositions and methods for killing head lice and their eggs
Encapsulated endoscope system in which endoscope moves in lumen by itself and rotation of image of region to be observed is ceased
Method of processing a context for execution
Full polarization synthetic aperture radar automatic target detection algorithm
High yielding multiple disease resistant/tolerant stable variety `Madakini` of opium poppy
Making jacketed lined pipe