Casting method of large water turbine blade

Abstract

The invention relates to a stereoscopic core assembly casting method of a water turbine blade, in particular to a casting method of a large water turbine blade. The casting method is characterized in that the casting method comprises the steps of designing process, making a core box, making a core bar, making a core, patching a sand core, assembling the cores, putting the cores into a sand box, paving a spure, sounding the sand core with silica sand, assembling the box, pressing the box, pouring, cutting a dead head, tempering, detecting a mold line, grinding and shotblasting. The casting method obviously shortens production cycle, reduces equipment capacity requirements for blade production, is simple in operation and easy to control and achieves blade mass production.

Description

technical field [0001] The invention relates to a casting method of a blade, in particular to a casting method of a large water turbine blade. Background technique [0002] There are two traditional casting methods for blades, one is horizontal pouring, that is, flat pouring, and the other is vertical pouring. Among them, the vertical pouring is divided into two forms: flat and vertical pouring and vertical pouring. The feature of flat bumping and flat pouring is that it is easy to operate, but due to the large area of ​​rising risers scattered upwards, the rising speed of molten steel is slow during pouring, and the floating slag is difficult to concentrate and float into the risers, resulting in poor surface quality and large deformation of castings; The characteristics of pouring are that the operation is more complicated, large lifting equipment is required, the box is turned over and lifted frequently, and the rigidity of the sand box is required to be high. It is diff...

AI Technical Summary

Problems solved by technology

The feature of flat bumping and flat pouring is that it is easy to operate, but due to the large area of ​​rising risers scattered upwards, the rising speed of molten steel is slow during pouring, and the floating slag is difficult to concentrate and float into the risers, resulting in poor surface quality and large deformation of castings; The characteristics of pouring are that the operation is more complicated, large lifting equipment is required, the box is turned over and lifted frequently, and the rigidity of the sand box is required to be high. It is difficult for ordinary small and medium-sized foundries to meet such requirements; the operation of vertical pouring is relatively simple , does not require large lifting equipment, does not need to turn over the box, and is convenient in shape, but requires a complete set of more complicated pit equipment, the surface of the mold is not smooth enough, and the surface of the casting is average. The shape of the blade is easily twisted and deformed, which affects the actual size of the blade

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