Reverse process manufacturing method to ensure the coaxiality of the trunnion of the large-scale converter support ring

Abstract

The invention discloses a manufacturing method for guarantying trunnion coaxility of a large-size converter support ring with a reversing process, relating to a converter support ring manufacturing method. The converter support ring is formed by connecting a driving side trunnion block, a tapping side fan-shaped body, a moving side trunnion block and a feeding side fan-shaped body, the reversing process is adopted, and the manufacturing method is performed according to the steps of erecting an assembly platform, drawing a line, performing laser detection, assembling the fan-shaped bodies, carrying out assembly detection, welding a driving side, control the coaxility, performing postweld heat treatment, detecting a flaw of a welding line, performing secondary adjustment, welding a moving side, cleaning a support ring, performing hydraulic test, coating and the like. The manufacturing method has the advantages that the reversing process is adopted; the method is novel in conception and is simple and convenient to operate; the driving side and the moving side are sequentially welded, laser detection and secondary adjustment are adopted, mutual affection is reduced, and deformation during welding is effectively controlled; standard welding deformation is eliminated due to secondary adjustment, deformation accumulated composition is reduced, the difficulty in controlling welding deformation is reduced, and work efficiency is improved; and the trunnion coaxility of the support ring has high precision, manufacturing quality is improved, service life is prolonged, consumption is reduced, and steel making production is facilitated.

Description

technical field [0001] The invention belongs to steelmaking converter components, in particular to a manufacturing method of a converter support ring. Background technique [0002] The converter support ring is an important bearing and transmission part of the converter. During the working process, in addition to bearing the static load of the furnace body, molten steel and accessories of the furnace body and transmitting the tilting moment, it also bears the dynamic load generated by frequent starting and braking, as well as the dynamic load from the furnace body, molten steel tank, smoke hood and spray The heat load generated by the thermal radiation of the splash. Therefore, the manufacturing quality of the support ring determines the service life of the converter, and the coaxiality of the two trunnions is an important technical quality index of the support ring. How to ensure that the coaxiality of the two trunnions meets the technical requirements of the drawings is ...

AI Technical Summary

Problems solved by technology

[0013] The disadvantages of using this technology are: simultaneous welding of the swimming side and the driving side requires a large number of welders, and it is very difficult to ensure welding consistency, and the deformation of the driving side will affect the deformation observation of the swimming side and the measurement of coaxiality , it is not easy to judge the cause of the impact and the adjustment position from the results

From the analysis of the concept of coaxiality, specification requirements, and measurement methods, it can be seen that the welding deformation of the driving side not only affects the position change of the long trunnion itself, but also affects the short trunnion due to the change of the datum, and even magnifies the deformation effect in value. Assembly process, if the benchmark changes and the deformation direction is opposite, increasing the deformation control requirements will greatly increase the difficulty of coaxiality control

When the non-drive side and the drive side of this thick plate, large cross-section, ring-shaped box girder structure are welded and heat treated simultaneously, once the coaxiality is out of tolerance, it is difficult to find an effective correction method, and it is difficult to achieve obvious results in flame correction, and Time-consuming and labor-intensive, there is a greater risk in construction

Therefore, since there are many process factors affecting the coaxiality of the two trunnions during welding, the trunnion blocks welded on both sides at the same time will be deformed at the same time and affect each other. It is difficult to control the coaxiality, it is not easy to adjust the process to control the deformation, and the manufacturing quality is difficult to guarantee. ; The service life is low, which seriously affects the smooth progress of steelmaking production

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