Abstract: A tubular workpiece with a throughgoing bore is held by a handler having a passage alignable with the bore and of a predetermined inside passage diameter. A rod carrying a mandrel and of an outside rod diameter is provided with a guide having an outside guide diameter slightly smaller than the inside passage diameter but greater than the outside rod diameter The passage is aligned by the handler with the workpiece bore and the mandrel is inserted through the handler passage into the workpiece bore while sliding the guide along the passage and centering the rod in the passage with the guide out of contact with an inner surface of the passage. The workpiece is externally engage around the mandrel with forging tools and thereby forged around the mandrel.

Abstract: A tubular workpiece with a throughgoing bore is held by a handler having a passage alignable with the bore and of a predetermined inside passage diameter. A rod carrying a mandrel and of an outside rod diameter is provided with a guide having an outside guide diameter slightly smaller than the inside passage diameter but greater than the outside rod diameter The passage is aligned by the handler with the workpiece bore and the mandrel is inserted through the handler passage into the workpiece bore while sliding the guide along the passage and centering the rod in the passage with the guide out of contact with an inner surface of the passage. The workpiece is externally engage around the mandrel with forging tools and thereby forged around the mandrel.