Sand core structure of water turbine blade steel castings

Abstract

The invention relates to a sand core structure of water turbine blade steel castings in the technical field of casting. The sand core structure comprises a plurality of sand cores which are sequentially spliced and combined, and a casting cavity is formed after every two adjacent sand cores are combined. After the sand cores are sequentially spliced and combined, the multiple casting cavities are formed. Core heads spliced in a matched manner are arranged on the peripheries of the outlines of the adjacent sand core cavities. Each core head is provided with a positioning structure. The sand cores share one pouring system. A dead head feeding structure is arranged on the top of each sand core. According to the sand core structure of a water turbine blade, the beneficial effects that the water turbine blade plane size is large, and the thickness is small are utilized, one combined sand core structure is adopted, the multiple casting cavities are formed, one-time box burying modeling and one-time pouring are conducted to form the multiple castings, the sand-iron rate is greatly reduced, the thickness of single sand cores is reduced, and the overall casting technology efficiency is improved.

Description

technical field [0001] The invention relates to a sand mold casting process of steel castings in the technical field of casting, in particular to a sand core structure of steel castings of water turbine blades. Background technique [0002] Turbine blades are the key components of water turbine units, which have the characteristics of large curvature changes, thin walls, and large warpage. The traditional casting scheme is generally a real sample molding (also known as the flat impact vertical casting method) such as figure 1 As shown, or core molding (also known as vertical pouring method) scheme, such as figure 2 shown. [0003] Among them, the plan of horizontal collision and vertical pouring is as follows: figure 1 As shown, including sand mold a and sand core b, they are molded separately and then assembled in a box. The existing defects are: [0004] 1) It is necessary to process the real sample and support the tire plate; [0005] 2) After the sand core is assem...

AI Technical Summary

Problems solved by technology

[0004] 1) It is necessary to process the real sample and support the tire plate;

[0005] 2) After the sand core is assembled, the sand box assembled with the sand mold / core needs to be turned upright, which is difficult to operate;

[0006] 3) The production efficiency is low, and the ratio of sand to iron (ratio of molding sand to casting weight) is large

[0008] 1) Each product needs to be divided into two sand cores, and the box is buried after the core is assembled. The cost of the model is high and the amount of buried sand is large;

[0009] 2) Due to the limitations of the design of the core box of this type of product, the core needs to be turned during the molding process;

[0010] 3) Low production efficiency and large sand-iron ratio

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