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).
Instructions on the casting process and required material properties for piston ring metal.
| Identifier | ExFiles\Box 37\2\ scan 165 | |
| Date | 6th November 1917 | |
| R.R. 28. (2M) S.D. (296. 15-3-17) M.P. 176550. ROLLS-ROYCE LIMITED. INSTRUCTIONS. To: Mr Clark 6 . 11 . 1917 Order No. Customer's No. Re. Piston Ring Metal. The piston rings should be cast in thoroughly fluid metal in semi-chilled mould (with covered core chill) The thickness of the casting should be, preferably, not more than 1/2". Rapid cooling is to avoid getting a too coarsely crystalline metal. The Tensile strength of metal cast in a similar way to pot should be over 13 tons per sq in. (after skin has been machined off). The Brinell Figure should be between 160 & 240. The transverse strength under standard conditions i.e. between 2ft centres of 1"x2" section should be over 30 cwt & give a deflection of more than 0.35" at middle. Signed: [Illegible signature] of Chemical Composition This Sheet must be filed on completion of the work. P.T.O. | ||