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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

Inactive Publication Date: 2007-06-27
张道勇
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Now, in the processing and production of busbar pipes, some of them are formed by casting, so that there is no weld seam, no air leakage and a certain strength, but the inner and outer surfaces are rough, difficult to process, and the cost is high; some are made of aluminum The alloy spinning welding method divides the busbar pipe into three parts, the flanges at both ends, the large mouth expanded at both ends and the straight pipe in the middle. When processing the large mouths at both ends, the sheet is stretched and formed, and then polished to match the mouth, and then the flange Welding with straight pipes requires overall aging before the processing can be completed. This method is time-consuming, laborious and expensive.

Method used

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  • Method for expanding bus pipe

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Embodiment Construction

[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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Abstract

The present invention discloses bus pipe flaring process, and relates to large caliber aluminum alloy pipe flaring process. The present invention completes bus pipe flaring in a flaring apparatus with two coaxial die heads and one power source connected to one or two of the die heads. The bus pipe flaring process includes the following steps: heating the ends of the straight pipe to 280-330 deg.c; pushing the ends of the straight pipe separately to two die heads coaxially; feeding the die heads until reaching the set stroke; and restoring the die heads to obtain the flared bus pipe. The present invention can produce bus pipe with high integrity, high precision, high strength and capacity of ensuring the reliability of combined switch.

Description

technical field [0001] The invention relates to a flaring method for metal pipes, in particular to a flaring method for aluminum alloy pipes. Background technique [0002] At present, 126KV and 252KV combined electrical appliances are the necessary high-voltage electrical combined switches distributed in the power grids of major cities, and the busbar tube is one of the most basic and indispensable parts of the combined electrical appliances. There are strong airtightness, anti-corrosion and strength requirements for the busbar tube, and the quality of the busbar tube will directly affect the service life and safety of the combined electrical appliance. The application of the bus pipe determines its structural characteristics, and the middle of the bus pipe is smaller in diameter than the two ends. Now, in the processing and production of busbar pipes, some of them are formed by casting, so that there is no weld seam, no air leakage and a certain strength, but the inner and...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B21D41/02B21D37/16B21D37/18
Inventor 张道勇
Owner 张道勇
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