Anti-deformation method for casting vane of ultra-large mixed flow type water turbine

Abstract

The invention relates to an anti-deformation casting method, in particular to an anti-deformation method for casting a vane of an ultra-large mixed flow type water turbine, which comprises the steps of mould manufacturing, molding, mould assembling, pouring, sand falling, cleaning and heat treatment. The method is characterized in that: the manufactured mould adopts a steel-wood mesh-shaped frame as aggregate which is filled with resin; a support is manufactured according to a molded line; a three-box T-type assembling, real pattern molding, flat building and vertical casting, combined sand boxes and resin self-hardening sand are adopted; facing sand adopts chromite sand; the inside of the molding sand is provided with a framework of steel reinforcement; the heat treatment adopts a vertical type charging method and uses a U-shaped supporting frock; and a dead head is cut and provided with a leveled dead head neck; the direction of the dead head neck is downward for supporting the vane; and two sides of the dead head neck are provided with a clamp for ensuring the vertical direction of the vane. The process method is unique, reduces the machining amount, reduces the ratio of gross and weight, shortens production period, reduces the cost, and solves the problems of deformation in vane production and manufacturing, and fat head and big ears caused by overlarge vane machining amount.

Description

technical field [0001] The invention relates to an anti-deformation casting method, in particular to an anti-deformation casting method for super-large Francis water turbine blades. Background technique [0002] At present, the main core component of the 700,000-kilowatt water turbine runner, the large-scale water turbine blade is made of about 65 tons of ultra-low-carbon stainless steel in one-time casting, which is the large-scale blade with the highest technical indicators for mixed-flow blades. Due to the large outline size of the blade, the outline size is 5245mm×4705mm, the warpage height is 2406mm, the wall thickness varies significantly from 379mm to 30mm, the geometry is complex, and the deformation is obvious during casting and heat treatment. One of the core difficulties, its manufacturing technology has long been monopolized by a few large foreign companies. [0003] For the deformation problem in large-scale blade casting production, there are no effective meth...

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Problems solved by technology

[0004] The purpose of the present invention is to overcome the deficiencies of the prior art, to provide a unique process, which can reduce the amount of processing, reduce the ratio of gross to net weight, shorten the production cycle, reduce the cost, and solve the deformation problem of blade manufacturing and blade processing. An anti-deformation casting method for super-large Francis turbine blades caused by the problem of "fat head and big ears" caused by excessive quantity

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