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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).
Spring load grading and the treatment of steel for springs.

Identifier  ExFiles\Box 154a\2\  scan0350
Date  25th June 1941
  
-cont'd- - 5 - Rm{William Robotham - Chief Engineer}/GB.5/SW.25.6.41.

Spring Load Grading (cont)

simplified by reducing the number of types of springs.

The graph on Page 6 shows the present range of 50" springs.

The graph on Page 7 shows how three springs and one piece of packing placed between the axle and the spring can be made to cover the present range.

If this is acceptable the 56" range could be rationalised in the same way.

Treatment of Steel.

Fox's were asked whether they took any precautions to reduce the depth of the decarburised layer on spring leaves.

It was pointed out that recent tests at Vauxhall had shown that compared to maximum stress, stress range was more destructive than it ought to be and that the most probable cause of this was decarburisation.

For our springs Fox's propose to open anneal the steel and de-scale it. This it was said would reduce the depth of the layer. Cold rolling would reduce the effect of what was left. This would not produce bright springs because of subsequent heat treatment.


Rm{William Robotham - Chief Engineer}/GB.
G.B.
  
  


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