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Synopsis: By the actual use of the Stiefel-Mannesmann piercer, the authors studied the effects of distances between top and bottom guide shoes made different as wide as possible upon the state of piercing phenomena from practical points of view. The results obtained were summarized as follows: 1) As the distance between top and bottom guide shoes increased while the other factors being kept constant, both the outside diameter and inside diameter of tubes became increased, while the wall thickness of tubes was kept constant, resulting in the decreased rate of elongation. However, the effects of these variations upon the practical operation were not so great to be taken into consideration. Nevertheless, when the distance between both top and bottom guide shoes was set wide open, the radii of both ends of the pierced shell became considerably larger. 2) The twist of tube surface increased. 3 ) While almost no variation was found in the main deformation, the swell of the circumference of the shell was conspicuously obserbed in the course of piercing operation, together with increace of the elliptic degree.

STUDIES ON THE PROCESS OF PIERCING SEAMLESS STEEL TUBES BY THE STIEFEL-MANNESMANN PIERCING MILL (III)