Overlapped-type casting method of large-size annular steel casting

Abstract

The invention provides an overlapped-type casting method of a large-size annular steel casting. The casting method includes the following steps of core fabrication, fabrication of outer die samples, modeling, core setting, mould assembling, pouring, mould dismantling, dead head removal, supplementing and attaching and cutting and parting. The step of core fabrication includes the processes that sand cores of the overlapped casting is prepared through a core box, and the sand cores of the overlapped casting include a first sand core, a second sand core and a third sand core from top to bottom; the step of modeling includes the process that the outer die samples are placed into a sand box to form outer die cavities; the step of core setting includes the steps that the third sand core is placed in the corresponding outer die cavity to form a pouring and forming cavity of the overlapped casting; and the step of cutting and parting includes the process that a workblank of the overlapped casting is cut and separated along a vertical partition plate casting to obtain a fourth-grade annular casting and a fifth-grade annular casting. The overlapped type casting technical scheme is adopted for the overlapped-type casting method, two or more castings are combined into an overall casting, therefore production efficiency is improved, and the casting cost is lowered.

Description

technical field [0001] The invention relates to the technical field of sand casting of ring castings, in particular to a superposition casting method of large-size ring steel castings. Background technique [0002] When casting large-size ring-shaped castings, the casting structure is complex, and the outline size and wall thickness vary greatly. Taking the large-size nuclear power partition outer ring casting as an example, such as Figure 10 , Figure 11 shown. [0003] In the traditional casting process, two semi-circular castings of the same model, specification and size are often combined into one casting for casting, and after casting, they are cut and separated into two semi-circular castings of the same model, specification and size. [0004] The current casting method has the following defects: [0005] 1) Based on the molding method of solid pattern + core box, each half-ring product needs to be set with a separate pattern and core box, and the cost of pattern pr...

AI Technical Summary

Problems solved by technology

[0005] 1) Based on the molding method of solid pattern + core box, each half-ring product needs to be set with a separate pattern and core box, and the cost of pattern production is relatively high for a single product;

[0006] 2) The molding efficiency is low, only one product can be produced in one box, and the amount of molding sand required for molding is relatively large;

[0007] 3) Higher smelting cost

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