Method for controlling multi-process accumulative error of large spacial bent circular steel tubes

Abstract

The invention discloses a method for controlling multi-process accumulative error of large spacial bent circular steel tubes. The method comprises the steps that according to the national standard, an adjustment angle delta theta is machined on the assembling plane of one bending circular steel tube, and the next section of a to-be assembled bent tube appears to rotate by the adjustment angle delta theta around the original point of a local assembly coordinate system in space; the adjustment angle delta theta rotate around a Z bar axis of the assembling plane and can rotate around an X bar axis and a Y bar axis simultaneously; the distance between adjusted three-dimensional coordinates and designed three-dimensional coordinates serves as an objective function, and an accumulative error optimized mathematical model is built by taking the requirement in the specification as the constraint condition; large spacial bent circular tube design model three-dimensional coordinate parameters are combined, two groups of parameters of design point three-dimensional coordinates and actually assembled coordinates serve as objective functions to be substituted into the spacial bent circular tube accumulative error controlling mathematical model, and the optimal solution of the adjustment angle is obtained through calculation. The method is suitable for controlling the accumulative machining error of large-span large-diameter spacial bent circular steel tubes for large exhibition halls, transportation junctions, Olympic stadiums and the like.

Description

technical field [0001] The invention relates to a method for controlling cumulative errors of curved circular pipes, in particular to a method for controlling cumulative errors of multiple processes of large-scale curved circular steel pipes in space. Background technique [0002] With the development of modern industry, all kinds of bent pipe parts are not only widely used in gas-liquid transportation, machinery, chemical industry, nuclear power, but also more and more widely used in modern construction industry, especially the large-span space curved round pipe steel structure, It is more and more used in large-scale expo halls, transportation hubs, Olympic stadiums, etc. [0003] The space curved circular tube steel structure adopts the piecewise point-by-point approximation method in the bending process. In the space arc part, a space coordinate system is selected. In this space coordinate system, the space arc is segmented and synthesized. Simplify it into an approxima...

AI Technical Summary

Problems solved by technology

However, this will increase unnecessary time and labor costs, and will cause residual stress in the pipe, which will affect the alignment of the space elbow.

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