Welding orientation method for hydraulic turbine blade core bone scaffolds

Abstract

The invention relates to a welding orientation method for hydraulic turbine blade core bone scaffolds in the technical field of casting. Before welding, a thick steel plate is prepared to serve as a welding platform, sand cores joining pipe fittings are arranged perpendicular to the steel plate, vertical projection positions of all the joining pipe fittings on the steel plate are marked in advance, a lug used for vertically connecting each joining pipe fitting in a sleeving mode is fixed in a welding mode, and a boss corresponding to the joining pipe fitting of each sand core is numbered the same as the sand core; then, all the core bone scaffolds are welded one by one, in the welding process, all the joining pipe fittings of the sand cores are vertically fixed to the platform firstly, and then other parts of the core bone scaffolds are welded with the joining pipe fittings being the benchmark; after core welding is over, relative positions of all the parts of the core bone scaffolds are corrected, it is guaranteed that the joining pipe fittings are perpendicular to the steel plate, and then fixing portions of the core bone scaffolds and the steel plate are unsoldered. The welding orientation method can guarantee that all the corresponding sand cores joining pipe fittings are opposite coaxially, and therefore repair workload is reduced.

Description

technical field [0001] The invention relates to the technical field of manufacturing technology of casting sand cores, in particular to a welding and positioning method for a water turbine blade mandrel support. Background technique [0002] The blades of large Francis turbines are all complex sculptured surface structures, such as figure 1 As shown, it is divided into Facade 1, Facade 2, Water Outlet 3 and Water Inlet 4. Taking a turbine blade as an example, its projection size along the facade is 5251mm×3970mm. The curvature is 1700mm. In the prior art, the commonly used molding methods for this type of castings are core molding, that is, making core boxes, quicksand molding, sand core butt joint combination, quicksand molding, and pouring. Moreover, it adopts the method of lying flat and upright pouring. Since the two sand cores are vertically connected during pouring, the parting surface cannot be pressed against the gravity of the sand core itself, and there is a ris...

AI Technical Summary

Problems solved by technology

[0005] The invention aims at the problem in the prior art that the core joints are easily dislocated during the core molding of the hydraulic turbine blade assembly, and provides a welding and positioning method for the core support of the hydraulic turbine blade, so as to facilitate the assembly of the sand core from the core support manufacturing stage The parts are accurately positioned relative to the core bone bracket to prevent the misalignment of the joint parts when the core is assembled

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