PURPOSE: To prolong the life of a mechanism for removing secondary scale by making a cooling bar which is provided in the tip part of a mandrel bar of elongator for manufacturing seamless tube and which is communicated with a path for cooling water of a flexible hose.
CONSTITUTION: A through hole 3 is provided in the center of the plug 1 of the mandrel bar 8, a member for introducing cooling water through the path for cooling water which is provided in the mandrel bar 8 is provided there and also the cooling bar is made of the flexible hose 6 in the mandrel bar 8 of the elongator for manufacturing seamless tube which the cooling bar with a water path 4 in the center part, in which nozzle holes which are communicated with the water path are provided in the tip part, is joined to that member. In this way, the life of the mechanism for removing secondary scale which is generated on the inside surface of tube stock can be prolonged.
YASUOKA HIDENORI
ISHII KIYOO
SUZUKI TOSHIO
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