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
Secure data entry device
Front portion of a vehicle, toy, and/or replicas thereof
ActRIIB proteins and variants and uses therefore relating to utrophin induction for muscular dystrophy therapy
Gestures for presentation of different views of a system diagram
Semiconductor memory system having ECC circuit and controlling method thereof
Coordinate locating method and apparatus
Polyureas made from aminocrotonates and enaminones
  Randomly Featured Patents
2,2-Difluoro-16-phenoxy-13,14-dihydro-PGF.sub.1, analogs
Fluid ejection device with fire cells
Equalizer, equalization method, program and receiving device
Method and system for melter tank airflow management
Parallel power system which includes over voltage protection
Heating, ventilating and air conditioning system controller
Ink jet recording apparatus and ink jet recording method
Security element and method for producing the same
Ball chain
Engineered anti-TSLP antibody