Machining and additive manufacturing combined water turbine model rotating wheel manufacturing method

Abstract

The invention relates to a method for manufacturing a water turbine model runner combining mechanical processing and additive manufacturing. The upper crown and the lower ring of the model runner are manufactured by mechanical processing of steel plates. On the formed crown, the electric arc additive manufacturing technology is adopted, and the cold metal transition surfacing method is used to import the mathematical model of the model runner into the computer, and the blade slicing and welding path planning are completed through the software, and the robot system is controlled to complete the blade augmentation. Manufactured from high-quality materials to form near-net-shaped blades, and stress-relief heat treatment is performed on the manufactured upper crown and the overall parts of the blade. The blade is machined in the CNC machining center, the upper crown and the blade are polished as a whole, and the lower ring is finally assembled to complete the manufacture of the turbine model runner. The method has the advantages of high processing precision, short cycle time and low cost.

Description

Technical field: [0001] The invention relates to a method for manufacturing a water turbine model runner combining mechanical processing and additive manufacturing. Background technique: [0002] With the increasingly intensified competition in the power generation equipment manufacturing industry, the manufacturing technology of hydraulic turbine model runners is becoming more and more important in the development process of hydraulic turbine runners, and to some extent even determines the success or failure of large-scale hydropower project bidding. The model runner is a single-piece product used to verify the design. Each power station project requires about 10 model runners. At present, it is mainly realized by CNC machining of cast copper billets. This manufacturing method has a long manufacturing cycle and high cost. In addition, the utilization rate of cast copper slabs is low, and at the same time, scrapping or subsequent processing due to defects in cast copper slab...

AI Technical Summary

Problems solved by technology

[0004] The arc additive manufacturing technology uses the arc as the energy-carrying beam, and adopts the method of layer-by-layer surfacing welding to manufacture metal solid components. The formed part is composed of all welds, with uniform chemical composition and high density. The open forming environment has no impact on the size of the formed part. Limitation, high forming rate, but the surface of the arc additive manufacturing parts fluctuates greatly, the surface quality of the formed parts is low, generally requires secondary surface machining, the main application goal of the arc additive manufacturing technology is the low cost of large-scale and complex components , Efficient and rapid near-net shape

Images