Welding structure lifting piece for steam turbine generator base and manufacturing method

Abstract

The invention discloses a welding structure lifting piece for a steam turbine generator base and a manufacturing method. The lifting piece is composed of a lifting piece column, a lifting piece base flange, a baffle and a screw, wherein the lifting piece column and the lifting piece base flange are of a split structure, torque is transmitted through seam allowance pressing fit, and therefore the maximum outer diameter size of the lifting piece column is reduced, the purpose that a whole forging lifting piece column structure is replaced by an axial sectioning assembly welding structure of the lifting piece column is achieved, the lifting piece column is formed by blanking and assembly welding of a thick steel plate, a split groove of the lifting column is a double-sided narrow-gap U-shaped submerged arc welding groove, a narrow-gap submerged arc automatic welding method is adopted for assembly welding, back-gouging-free full penetration of a welding seam is achieved by matching specific groove truncated edges, groove bottom arc radiuses, front and back face first-layer welding process parameters and a welding sequence, the welding quality is guaranteed, and after the lifting bar column is assembled and welded, subsequent processing and use are carried out according to a tool design drawing. Compared with an existing lifting piece of an integral forging structure and a manufacturing method thereof, on the premise that the reliability of the technical scheme is guaranteed, the manufacturing cost of a lifting piece tool can be reduced, and the period can be shortened.

Description

technical field [0001] The present invention relates to the technical field of design, manufacture and use of lifting jig tooling required for horizontal lifting and turning operations during the assembly and welding process of a turbogenerator stator base, and in particular to a welding structure lifting bracket for a turbogenerator base and a manufacturing method thereof . Background technique [0002] The stator base of the steam turbine generator is a major component, and the general weight is more than 100 tons. The safety of the lifting and turning process is particularly important. Therefore, the traditional crane uses an integral forging with a tensile strength of more than 800MPa to process the flange. When in use, it is combined with the lifting and climbing seat of the stator frame of the turbogenerator, and the two are pressed and fitted through the seam and the torque is transmitted, so as to realize the horizontal lifting and turning operation of the stator fra...

AI Technical Summary

Problems solved by technology

[0004] 1) The hanging column and the flange are integrated structure, the radial dimension of the whole forging must be larger than the pitch circle dimension of the bolt hole of the hanging seat, which will result in a large forging size, high order procurement cost and long cycle

[0005] 2) Even if the hanging column and the hanging seat flange adopt a split structure to reduce the diameter of the hanging column, it is difficult to find a large-size round steel material that meets the requirements in diameter and mechanical properties to replace forgings

[0006] 3) The weldability of forged steel of this strength level is poor. From the perspective of lifting safety, the welding structure of the hanging column and the flange cannot be used. It will occupy the processing equipment for a long time, and the waste of materials is serious

[0007] From the above points, it can be seen that although the whole forging structure has good safety, its high manufacturing cost and long order procurement cycle restrict the application of this kind of structure, so it is necessary to develop Develop a low-cost, short-production cycle, and high-technical reliability manufacturing process for the horizontal suspension and flipping of the turbogenerator stator frame

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