GB862817A - Method of pressing a hollow cylindrical metal article - Google Patents

Abstract

862,817. Making gudgeon pins; extruding; forging. TEXTRON Inc. June 23, 1959 [June 30, 1958], No. 21460/59. Classes 83 (2) and 83 (4). A hollow cylindrical metal article, particularly a gudgeon pin, Fig. 11, having deep openings 50, 64 extending from both end faces, is made from a solid cylindrical blank by forcing a punch into one end face, turning the blank end for end and then forcing a second punch into the opposite end face, both' punching operations producing backward extrusion of the blank. The blank 23, Fig. 1, is cut from rod stock 14 by a knife 15 and transferred thereby to die station 1. Here it is indented at both ends by an ejector punch 19 and a punch 21 carried by a reciprocating gate 11 and simultaneously an external chamfer 18 is formed by the die 16. The workpiece is turned end-for-end during its transfer to station 2 where it is indented further on its outer end by a punch 32 whilst supported against an ejector punch 29. At station 3 the workpiece is backwardly-extruded over the nose 48 of a punch 46 and simultaneously an external chamfer 51a is produced on the inner end whilst the latter is further indented by ejector punch 43. During transfer to station 4 the workpiece is turned end-for-end, the previously extruded bore being supported over a punch 58 whilst the workpiece is backed by an ejector sleeve 55. A punch 60 with a nose 62 effects backward extrusion of the outer end of the workpiece and simultaneously the punch nose 59 forms an extension of the inner end bore. At the final station 5 the central web is punched out at 76, Fig. 11, to form the final gudgeon pin, the web being ejected through holes 75.