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
Semiconductor device and method of forming discontinuous ESD protection layers between semiconductor die
Adaptive analog echo/next cancellation
Electric train drive control device
Composite conductive pads/plugs for surface-applied nerve-muscle electrical stimulation
Treatment of diabetes with milk protein hydrolysate
Method and system for associating a cell-sector with time-dependent location parameters
  Randomly Featured Patents
Static bearing
Collapsible auto shade
Random access memory using precharge timers in test mode
Optical beam scanning apparatus, optical beam scanning method and image forming apparatus
Soldering iron
Inventory commingling and reconciliation of inaccuracies
Device and method for controlling switchover of broadcasting channel in digital multimedia broadcasting receiver
Fine-line diffractive subtractive color filters
Combined portable earphone storage case and stand
Method for manufacturing semiconductor device using anisotropic etching