Impeller blade is a direct part of the realization of the aerodynamic performance and efficiency of the engine and gas turbine, which greatly determines the functional properties of the engine and gas turbine. As a whole, the blade is in the form of irregular three-dimensional space curved surface, with complex structure and thin wall. The curved surface structure makes the surface accuracy difficult to guarantee, so the surface quality of the blade surface is almost critical Please.
Because of the complexity of the surface modeling of the pages, the large distortion of the blades, the large number of blades, the thin walls, the large angle changes, the high requirements for dynamic balance, and the internal joints are not allowed. It makes the traditional casting method difficult to produce.
The traditional way of casting impeller blade is not able to open the mold as a whole. Usually, a complete impeller blade is divided into several parts to open the mold, and then the casting model is obtained by splicing, so there will be a splicing gap in the model. In addition, because the blade is thin and the structure is complex, it is difficult to open the mold and the cost is high.
It is much simpler to use the rapid casting technology to cast the impeller blades. Using 3D printing to directly print the whole wax mold, no need to open the mold, no need to follow-up splicing, no splicing joints inside, and save the cost of opening the mold. The failure rate of printing wax mold can be effectively reduced by casting after the analysis of castability and casting simulation. The whole production cycle is short, printing is only 1 day, casting is only 15 days, which greatly shortens the production cycle and reduces the time cost.