Method for manufacturing trunnion ring of large-size converter

Abstract

The invention discloses a method for manufacturing a trunnion ring of a large-size converter. The backing ring is manufactured to comprise a drive-side trunnion seat, a non-drive-side trunnion seat, a tapping-side fan-shaped segment and a feed-side fan-shaped segment. The manufacturing method comprises the following steps: pre-assembling the four components, connecting the two trunnion seats as a whole body by use of a trunnion ring support tool during preassembly, dynamically monitoring the coaxiality of trunnions on the two sides of the trunnion ring by use of a laser collimator, and adjusting the position relationship among the four components of the trunnion ring when the monitored coaxiality can not meet the precision requirements; marking the welding parts between two components after the pre-assembled trunnion ring can meet the requirements for planeness and coaxiality precision; removing the trunnion ring support tool and transporting the four components to an installation site; and re-assembling the components and welding to complete the manufacture of the trunnion ring. The method is characterized in that the laser collimator is adopted to dynamically monitor the coaxiality of the trunnion seats during assembly and welding processes in the installation site, and the assembly and welding operations are regulated in real time.

Description

technical field [0001] The invention relates to a method for manufacturing a large-scale converter support ring, which can ensure the coaxiality of the support ring trunnion at within. Background technique [0002] The support ring is an important bearing and transmission part of the converter, which is used to bear static loads such as furnace shell, furnace lining, molten steel and self-weight, and also needs to bear dynamic loads caused by frequent starting and braking and impact loads during operation. Therefore, the support ring must have sufficient strength and rigidity to carry a large weight, so as to support the furnace body and transmit the tilting moment. [0003] For converter support rings less than 60 tons, it is generally made into an integral structure, and the coaxiality of the trunnion mounting holes at both ends is guaranteed by the machine tool, and the trunnion is hot-fitted to ensure its coaxiality and connection rigidity. [0004] With the developme...

AI Technical Summary

Problems solved by technology

This process method has low processing and assembly precision, especially the processing of reaming holes. Because of the small size between the bolt hole and the support ring body, the general processing machine tool cannot complete the matching processing of the reaming holes of two flanges at the same time. The method of milling datum and single processing can be adopted, the processing efficiency is low and the precision is low, so the assembly accuracy is poor; (2) the welding positioning block method, the supporting ring is still divided into four parts, which are respectively called the transmission side trunnion seat and non-transmission Two sets of positioning blocks are respectively welded on the side trunnion seat, tapping side segment and feeding side segment, and the horizontal reference plane of each positioning block is machined so that it is in the same plane as the theoretical center line of the supporting ring. The vertical reference plane of each positioning block is machined to be parallel to the theoretical center line of the support ring, and the accuracy is required to reach 0.1mm. When assembling and welding on site, rely on the processed positioning reference block to assemble, and the trunnions of the two trunnion seats Pull a steel wire through the center hole as a reference for trunnion alignment, and use a micrometer to measure the distance from each point on the arc surface of the trunnion seam to the steel wire to ensure the coaxiality of the trunnion; (3) The main body of the support ring is made in two halves, Positioning by positioning keys, on-site welding process

[0006] The manufacturing process of these support rings relies on machining benchmarks to ensure the coaxiality of the trunnions, and the dynamic monitoring and control of the support ring trunnions cannot be realized during the welding or joining process, so the manufacturing accuracy is low

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