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).
Notes and guidelines on forging principles and techniques.
| Identifier | ExFiles\Box 109\3\ scan0008 | |
| Date | 28th June 1940 guessed | |
| -.6 - (3) Offset, which affects section thickness and tooling location. (4) Draft allowance, its amount and disposition, affecting weight and ease of forging. (5) Particularly the remarks on die cracks which affect the die life. (6) And in planning new forgings should decide the main bosses, bosses size and shape and, Balance out the web thickness with flange thickness and join up with good easy flowing radii. Do not make thin "waisted" forgings. Make the forging with the "flash" in "flat" plane rather than through the vertical section. This gives less draft and makes the forging sit better in jig locations. Avoid making the flash line lie in more than one plane unless absolutely necessary as machining difficulties are increased. Applications of the above principles to future planning of forgings should show a reduction in scrap and greater facility in both forging and machining. The above subject can be considerably enlarged upon in all sections if required and we would like your opinion on this and other notes, which we have in mind on Pressings, Sheet Metal work and Foundry technique as applied to our own problems. ----------------- HPS{Horace Percy Smith - Experimental Factory Mgr}/Cy. | ||