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).
Material specifications, casting, and heat treatment processes for metal components.
Identifier | ExFiles\Box 115\3\ scan0110 | |
Date | 16th November 1937 | |
(f) We agree with this point if necessary, but refer to item (e). (g) Material will be produced in batches and all details recorded, and when our pyrometric installation is completed we shall also be able to provide the melting history of the metal. (h) It has been agreed with H1 that the test pieces shall take the form of a Billet as in point (b). (i) When corrections are necessary and a mix is made, as may be required to utilise the AC2, H1 will arrange that this composition will be checked and observed. (j) We do not make any cast that exceeds 300 lbs. The AC2 material in Stores can be modified to produce AC7, but this matter should receive and be the subject of a further investigation. Referring also to memo' RHC.{R. H. Coverley - Production Engineer}3/MJ. 16. 11. 37. we suggest that, upon consideration of tests that we have taken today, the melting temperature be reduced to read 680º from 700º. This temperature is very critical and cracks are visible at 710º. It would be an advantage if the first heat treatment process be placed in this Department as in point (e) the responsibility would be ours both as regards brinell and production. The second heat treatment after heat treatment after machining is necessary for stabilising, but the matter of brinell is debatable. We are going very closely with H1 into the matter of heat treatment furnaces and when this matter is decided we will forward a report. Bearings have today been manufactured in AC7-with H1- and these are marked Batch No. 1. and will be forwarded to Heat Treatment, in the morning, by which time we shall have the Laboratory results upon sample specimens which were taken from the cast in accordance with point (b). These bearings have been in the normal routine and all details pertaining to them have been recorded and we can furnish this matter if required when tests are completed. [Signature: H.J. Meeks] 2. | ||