| Abstrakt: |
This paper describes a new rapid-action self-contained hydraulic press developed for wartime industries in Canada. Since this mass-production press employs oil as the pressure medium, the power unit is of special interest. This the author deals with at some length. The operations for which the press is particularly adapted, namely, drawing, indenting, and loading cartridge cases, are described in some detail, as are also the methods of press control. A suitable hydraulagraph was developed for measuring pressure changes, and this instrument provides a permanent graphic record of tests on modern presses. The “one-shot” press and a 300-ton gun-straightening press are also discussed. |
