Petro-Forgen.
/ˈpɛtrəʊfɔːdʒ/, U.S. /ˈpɛtroʊˌfɔrdʒ/ Now historical.
A kind of forging machine powered by a petrol engine.
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Petro-Forge1964
1964 Engineering 2 Oct. 438/2 A session at the fifth MTDRC was devoted entirely to high energy rate forming... The paper read last: ‘Petro-Forge Mk I-DRD’,..gave evidence of industry's keen interest in the development of a method of high energy operation which uses the internal combustion process for its power source.
1965 Economist 18 Dec. 1354/3 The Petro-Forge has been sufficiently developed (it started under a DSIR grant in 1962) to show that even when working at slow speeds it will be cheaper and better than existing forging machinery.
1973 E. C. Rollason Metall. for Engineers (ed. 4) vii. 129 In the Petro-forge the energy is derived from the combustion of a fuel/air mixture in the cylinder of an internal combustion engine.
1997 Jrnl. Materials Processing Technol. 65 157/2 It was explored by the late Professor Stephen Tobias and his students with the aid of his Petroforge machine, blanking at fast yet industrially realistic speeds of up to 100 ft/s.
This entry has been updated (OED Third Edition, December 2005; most recently modified version published online March 2022).
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n.1964