Resources Contact Us Home
Browse by: INVENTOR PATENT HOLDER PATENT NUMBER DATE
 
 
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
Image processing apparatus capable of using replacement component, image forming apparatus capable of using replacement component, and method of administrating replacement component
Method and apparatus for blind signal extraction
Coated article and method for making the same
Detachably integrated battery charger for mobile cell phones and like devices
Femtocell one-to-many packet delivery
Simulating non power of two texture behavior
Method and apparatus for error correction in MBMS receipt system
  Randomly Featured Patents
Process for producing a plastic foil of thermoplastic material
Fluid system having quill-mounted manifold
Paging receiver with a capability of receiving or inhibiting message data
Assessment and optimization for metrology instrument
Air filter with back flow cleaning
Smooth scanning presenter
Superscalar processor employing a high performance write back buffer controlled by a state machine to reduce write cycles
SOI wafer and its manufacturing method
Annular blowout preventer with upper and lower spherical sealing surfaces
Medical device for analyte monitoring and drug delivery