From the Rolls-Royce experimental archive: a quarter of a million communications from Rolls-Royce, 1906 to 1960's. Documents from the Sir Henry Royce Memorial Foundation (SHRMF).
Description of a quenching tank design and the procedure for hardening gears using a Gleason Quenching Press.
| Identifier | ExFiles\Box 114\1\ scan0071 | |
| Date | 2nd January 1936 | |
| -2- The accompanying sketch shows the typical design of the tank used. The tank is divided into squares or circles, and the partitions forming these squares or circles do not reach the bottom or the top. The bottom of the partition should be at least 12" above the bottom of the tank. A pin, reaching slightly above the surface of the oil, is placed at the corner of each square in the partition for location purposes. The quenching fluid is brought into the tanks through pipes which extend right across the bottom of the tank, perforations in the pipes being located on the under side of the pipes so that the quenching fluid is equally distributed over all sections of the tank. Above the tank, rods are placed across the tank centrally located over a row of the square or circular divisions in the tank, spacing collars are located on these rods centrally over the other row of squares or circles. Means are provided so that the pinions can be hung on the rods between these spacing collars while they are being quenched. The head of the pinion should be at least 6" above the bottom of the partitions and the diameter of the squares or circular divisions should be 2" greater than the largest diameter of the pinion to be quenched. In this way, each pinion is quenched under exactly the same conditions. The means of holding the pinion in position will, of course, vary with the design of the pinion shank. Copper sleeves are sometimes used for protecting threads as well as providing a means for holding the pinion. When gears are to be hardened by box quenching, the following treatment is an example of the procedure with SAE 2315 steel: 1 - Carburize at 1700° F.{Mr Friese} 2 - Thoroughly brush or clean all foreign material. 3 - Quench in oil in Gleason Quenching Press. 4 - Draw at 275° F.{Mr Friese} for two hours (optional - many plants have found that no draw is required) It may be found advisable to provide a separate furnace between the continuous furnace and the quenching presses in which to hold the filled pots up to heat as they come from the carburizing furnace in case of any hold-up at the presses. The pots are not dumped but the gears are removed, brushed and quenched one at a time to prevent too rapid cooling. When quenching gears direct from the carburizing pot, it is most important to make sure the gears are thoroughly cleaned of all carburizing material. The usual procedure is to place the hot gear on a screen and brush all over with a wire brush. The gears are then placed in a Gleason Quenching Press. This holds the gears round and flat in dies as they are immersed in the oil. GLEASON WORKS Rochester, New York | ||