BEND WORK DEVICE FOR METAL TUBE

PURPOSE:To stabilize the plane face accuracy of a bend tube and to relieving the restrictions of working shape and dimension by providing the rotary shaft of an arm on the upper direction of the tube to be worked and by making the arm supporting structure a both ends support. CONSTITUTION:The tube to be bent 1 is inserted into a high frequency heating coil 3 and fixed to an arm 12 via a clamp device 13. Simultaneously with the tube wall reaching the hot work zone with the high frequency heating a coolant is sprayed on the surface from a pump 4 and the heating width is controlled by a cooling ring 5. The arm 12 setting the bend radius is rotated centering around a rotary shaft 14 with the temp. rise thereof, performing a bend work on the tube 1 fed out by a feeding device 7. In this case due to the rotary shaft 14 being of both ends support the bend work is performed irrespective of the gap of abrasion, etc. and a stable plane face accuracy is obtd. and the shape and dimension restrictions due to the installation structure of the work machine is relieved as well in case of a solid bending.