Bent tube machining technology

Abstract

The invention discloses a bent tube machining technology. According to the technology, by improving the flange spot welding and fixing method, the bend starting point determination method, the clamping method before the pipeline bending and the flange location method, the location convenience and precision and the machining precision are well improved. Therefore, under the condition that a numerical control tube bending machine is not used, the location precision and machining precision can be better guaranteed, the equipment cost is reduced, and meanwhile the precision and quality of the tube bending machining are improved.

Description

technical field [0001] The invention relates to a pipeline processing technology in the shipbuilding process, in particular to a bending pipe processing technology. Background technique [0002] In the process of shipbuilding, a large number of bent pipes need to be processed. Due to the changeable and complicated pipe bending conditions, if the pipe accessories are installed after the pipe is bent, the positioning and welding of the pipe accessories are very difficult. In order to overcome this difficulty, the processing technology of welding the pipe accessories at both ends first and then bending the pipe is often used. That is, the process of welding first and then bending. At present, the processing technology of the bent pipe is roughly as follows: assemble the pipe accessories in the straight pipe state, then weld and trim the pipe accessories, and finally use the CNC pipe bender to bend the pipe into shape. The assembly process of the pipe accessories is to plac...

AI Technical Summary

Problems solved by technology

[0004] 1. The positioning accuracy is poor; when the trolley mechanism of the pipe bender rotates back to the zero position, the error is large

[0005] 2. The forming accuracy of the pipe is poor; the forward distance and rotation angle of the trolley mechanism have large errors, and the starting point and bending angle have large errors

[0006] 3. For relatively long pipes, due to the heavy weight of the pipe, manual work cannot ensure that the end of the pipe is tightly attached to the end of the trolley, resulting in errors when the pipe is fed

[0007] 4. The distribution of elongation is unreasonable, all the elongation is deducted from the straight pipe section after the bending stop, and the elongation of the pipe section before the bending is not considered when the pipe is actually bent, and the bending error is large

[0008] 5. The CNC pipe bending machine used is expensive and expensive