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).
The manufacturing process for vehicle springs.
| Identifier | ExFiles\Box 43\2\ Scan075 | |
| Date | 28th October 1925 guessed | |
| -3- 3. Taper ends and trim to shape. (These two operations are performed hot, the tapering in a rolling mill, and the trimming in a press having two sets of discs, one for the larger plates and the other for the smaller plates) 4. The plates are then reheated in a suitable furnace and bent to shape on a rig mounted on a tank. 5. The plates are next heat-treated, i.e. hardened and tempered. The small quantities will permit this being done in the furnace used for bending plates. 6. Grinding and polishing the plates. This operation is done on cloth wheels and leather bands set up with emery and offers no difficulty. 7. Fitting rebond clips. 8. Assemble spring and adjust for the fitting of the plates. 9. Grinding plates to width at the eyes. This is usually done in a Double Disc Grinding machine. 10. Test on a machine similar to a Bull-Dozer for shape and closeness of the joints. 11. Test on the spring testing machine for weight and camber. These operations are practically complete with the exception of those required to produce the back plates in both cases. The back plate of the front spring is being produced as a forging from metal one-half inch thick, and after forging is milled to size by us. The forging is produced with a small projection at each end in order that we may make a fracture test to examine the structure of the metal. This method is producing a very satisfactory plate at a reasonable price, and it is the method we propose to adopt when we make our own springs. | ||