Application method of modeling sand substituting blocks in casting of large cast steel

Abstract

An application method of modeling sand substituting blocks in casting of large cast steel is characterized in that a large cast steel casting technology adopts modeling sand substituting blocks to substitute parts of modeling sand in founding molding to reduce the sand-to-iron ratio and improve the modeling sand permeability, and the modeling sand substituting blocks are waste molten steel casting products with any shape. The application method comprises the following steps: 1, determining the structure, the shape and the dimension of the modeling sand substituting blocks according to the characteristics of the cast steel and the specifications of a sandbox; 2, molding through adopting a routine technology, and using the waste molten steel to cast the modeling sand substituting blocks; 3, marking the disposing positions of the modeling sand substituting blocks in the sandbox; 4, using the modeling sand substituting blocks to substitute parts of the modeling sand in the founding molding of the large cast steel; and 5, opening the sandbox after the casting of the large cast steel is completed, and collecting the modeling sand substituting blocks for later use. The method has the advantages of reduction of the dosage and consumption of the modeling sand, cost reduction, reduction of the weight of the modeling sand, convenience in operation, improvement of the permeability of the modeling sand due to spaces in the modeling sand substituting blocks, and guaranteeing of the quality of casting products.

Description

technical field [0001] The invention relates to a casting process for large steel castings, in particular to a method for applying molding sand instead of blocks in the casting of large steel castings, and belongs to the technical field of casting. Background technique [0002] The foundry molding process of a single large-scale steel casting is usually to spread part of the molding sand in the sand box, then put it into the cavity mold, then fill the molding sand around the cavity mold and tamp it down, and take out the mold after the molding sand is bonded and formed. Cavity mold, and finally close the case. [0003] According to many years of actual production experience, the foundry molding method has the following deficiencies: [0004] 1) The ratio of sand to iron in foundry molding of large-scale steel castings is relatively large, the amount of molding sand is large, the consumption is also high, and the cost is high. [0005] 2) Some large steel castings with comp...

AI Technical Summary

Problems solved by technology

[0004] 1) The sand-iron ratio of large-scale steel castings is large, the amount of molding sand is large, the consumption is also high, and the cost is high

[0005] 2) Some large steel castings with complex shapes have large dimensions, use large sand boxes, and use small space. Too much molding sand will reduce the air permeability of the sand mold, thus affecting the quality of castings

[0006] 3) The sand mold weight of large steel castings is sometimes too heavy, resulting in exceeding the lifting capacity of the lifting equipment, resulting in difficulties in foundry molding operations

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