Method for expanding bus pipe
A bus pipe and straight pipe technology, applied in the flaring field of aluminum alloy pipes, can solve the problems of rough internal and external surfaces, difficult processing, high cost, etc., and achieve the effects of improving production efficiency, saving manufacturing costs, and good airtightness
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[0015] First, heat the two ends of the straight pipe 3 to 300 degrees centigrade with a blowtorch, and the heating range should be determined according to the axial size of the mouth.
[0016] Then, in two straight pipe ports of straight pipe 3, evenly smear lubricating oil on die head 2,5, and die head 2,5 preferably will be chrome-plated, and die head 2,5 will design certain demold taper.
[0017] Use the bracket 4 to adjust the axis of the straight pipe 3 and the axes of the die heads 2 and 5 on the same axis.
[0018] Feed the piston rod of the oil cylinder 1 to make the die heads 2 and 5 reach the set stroke. When the temperature at the end of the straight pipe 3 is maintained at 300 degrees Celsius, the feed speed of the hydraulic cylinder 1 is set at 0.5 to 1.5 mm per second, so that It can ensure that the straight pipe 3 will not wrinkle and the pipe wall will not crack;
[0019] The die heads 2 and 5 withdraw from the return position and withdraw from the finished tu...
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