In the processing of fan impeller, when shaping and annealing, the workpiece is fixed by special plastic tooling and the workpiece is placed in the vacuum annealing furnace along with the tooling. The temperature is raised to 450 °C-470 °C with the furnace, and the furnace is heated for 2.5h-3h. Cooling, when the furnace temperature is lower than 150 ° C, the furnace is air cooled to room temperature. On the one hand, this process can eliminate the welding residual stress, on the other hand, it can correct the deformation of the blade and the wheel, and lay a foundation for ensuring the design performance of the impeller.
When welding the wheel cover, first clean the surface of the workpiece and assemble it, insert the protruding part of the blade into the plug welding groove of the wheel cover, press the point and then weld it, then weld the plug weld, strengthen the welding The ammonia gas is protected in the high temperature area, and the surface of the weld is welded flush with the surface of the base metal.
The parts are processed according to the requirements to process the wheel and the wheel cover; draw the wheel row welding position line, the inner and outer circles of the wheel cover are left as required, and the wheel cover is stamped; the blade is processed to the requirements; according to the blade welding position, The blade plug welding groove processing line is drawn on the wheel cover, and the welding groove is milled.
Through the above method, the welding problem of the welding zone of the narrow impeller series iron fan impeller is solved, which is changed from inoperable to simple and easy to operate, and the strength of the weld is improved; the problem of large welding deformation of the chisel fan is solved, and the comprehensive performance of the fan is improved. .
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