Manufacturing method for producing mixed-flow-type water turbine bottom ring wear-resistant layer through strip surfacing

Abstract

The invention relates to a manufacturing method for producing a mixed-flow-type water turbine bottom ring with a wear-resistant layer structure through strip surfacing, wherein the manufacturing method can guarantee the tolerance and the quality of the bottom ring, can save the cost and can shorten the production period. The manufacturing method comprises the following steps of: after blanking according to a drawing, flattening by using an oil press, wherein the flatness is not more than 3mm; welding the bottom ring and conducting stress relief annealing on a welded part according to a special annealing curve; after annealing, conducting sand-blast cleaning; transferring the welded part into a machining workshop for primary machining; after machining, transferring the welded part back and surfacing the inner circle of the bottom ring through consumable electrode gas shielded arc welding; after the inner circle is surfaced, hoisting the bottom ring to a welding positioner, firmly fastening the bottom ring, moving a carriage before surfacing, verifying position accuracy, adjusting the position if the bottom ring is eccentric and surfacing the planar wear-resistant layer on the bottom ring by using a strip surfacing method after verification; and after surfacing, conducting softening annealing on the bottom ring welded part according to the special annealing curve, and after annealing, transferring the bottom ring welded part to the next process for machining a shaft hole.

Description

technical field [0001] The invention relates to a manufacturing process for producing an anti-friction layer of the bottom ring of a Francis water turbine with a pole welding wire. Background technique [0002] In the past, the bottom ring of Francis turbine with anti-wear layer structure was produced, and the anti-wear layer was produced by welding rod or wire. When this method produces the anti-wear layer, at least 2-4 welders are required to be evenly distributed in the circumferential direction, use the same specification, and weld at the same speed and in the same direction at the same time. This method is difficult to implement, and it is difficult for multiple welders to maintain the same welding specifications, and it is also difficult to ensure the same welding speed, and the production cycle is long. Under the premise that the welding process specifications and welding speed cannot be strictly guaranteed, due to the asymmetry of the welding volume of the bottom ri...

AI Technical Summary

Problems solved by technology

This method is difficult to implement, and it is difficult for multiple welders to maintain the same welding specifications, and it is also difficult to ensure the same welding speed, and the production cycle is long

Under the premise that the welding process specifications and welding speed cannot be strictly guaranteed, due to the asymmetry of the welding volume of the bottom ring structure, it is easy to cause large uneven deformation on the side of the surfacing layer, and the dimensional stability after surfacing is poor, and it is difficult to correct

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