Three-roller type roundness correction method and roundness correction device for pipe end of large pipe fitting

Abstract

The invention provides a three-roller type roundness correction method for a pipe end of a large pipe fitting. The three-roller type roundness correction method specifically comprises the following steps that the taper of conical ends of rotating rollers is calculated; the distances between pipe correction ends and the conical ends of the rotating rollers and the distance between the rotating rollers are adjusted; a motor is started, and the three rotating rollers located on the same reference circle rotate around the outer normal of the circle center of the reference circle; a hydraulic cylinder is started, and the three rotating rollers move in the direction close to the corrected ends of to-be-corrected pipes along the outer normal of the circle center of the reference circle; the conical ends and linear ends of the rotating rollers are used for carrying out contact loading on the corrected ends of the pipes; and the hydraulic cylinder is started, a rotating disc begins to move in the opposite direction at the same speed for the same displacement, unloading is carried out gradually, and the corrected pipes are taken out from a clamping assembly. The roundness correction device comprises a rack installed on a bottom plate, the clamping assembly for clamping the to-be-corrected pipes to be corrected, the rotating rollers used for correcting roundness and the rotating disc used for driving the rotating rollers to rotate. The device is wide in roundness correction range, continuous loading and unloading can be achieved in the roundness correction process, and the roundness correction efficiency and precision are improved.

Description

technical field [0001] The invention relates to the field of mechanical processing, in particular to a three-roller rounding method and a rounding device for pipe ends of pipe fittings, especially large pipe ends. Background technique [0002] With the development of petrochemical, aerospace, shipbuilding and other industries, the output demand and quality requirements for large pipe fittings are increasing day by day. Ovality is one of the important parameters to measure the quality of pipe fittings. If the ovality of the pipe end is out of tolerance, it will directly affect the connection process between the pipe fittings, resulting in excessive residual stress when the two pipes are welded, reducing the service life of large pipe fittings. In actual production, the ellipticity of the pipe end is more important than the ellipticity of the pipe body, so the requirements for the ovality of the pipe end of the pipe fittings are also higher. [0003] In the production proces...

AI Technical Summary

Problems solved by technology

In actual production, it often happens that the ovality of the pipe body reaches the standard, but only the ovality of the pipe end does not meet the standard. At this time, the overall rounding method is used in low efficiency and high cost

And for tee pipes and elbows, there is no better overall rounding method at present

The existing pipe end rounding method is mainly rounding rounding, but the rounding efficiency is low and often requires multiple pressure tests

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