Casting technology and application of thick and large ductile cast iron pieces

Abstract

The invention discloses a casting technology and an application of thick and large ductile cast iron pieces. The technology is characterized by including the following steps that (1) castings are designed by the aid of three-dimensional software, and single mode flow analysis is performed on the castings by the aid of mold flow software, so that the non-reducing positions and number are judged; (2) a sand mold is manufactured; (3) a molten iron raw material is prepared; (4) inoculation treatment and spheroidizing treatment technologies are formulated and controlled; (5) the prepared molten iron is heated, and pouring is performed; (6) after pouring is completed, the molten iron is cooled along with the sand mold, off-line separation is performed after cooling, and the castings are obtained; (7) material detection is performed and includes metallographic structure detection, mechanical performance detection, hardness detection and inwards-sinking detection; (8) sand washing, grinding, cleaning and appearance inspection are performed on the castings, and qualified castings are obtained if the castings are qualified. Compared with the prior art, the technology has the advantages thatthe steps are simple, the materials are easy to obtain, the cost is saved, and the technology is wide in applicability.

Description

technical field [0001] The invention relates to the field of die casting, in particular to a casting process and application of thick and large ductile iron castings. Background technique [0002] Casting, also known as foundry, has a long history. With the development of technology, traditional manual sand foundry has developed: green mold sand automatic production line casting, iron mold sand-covered automatic production line casting, shell core stacked box casting, resin sand casting, lost foam Casting, precision casting, etc., each have their own characteristics and scope of application. [0003] Customers' quality requirements for castings are becoming more and more detailed and improving. Generally, common casting quality problems are divided into: size problems, material problems, appearance problems, and indentation problems. Among them, the internal problem is a functional problem, which affects the strength and life of the product, and even leads to loss of life a...

AI Technical Summary

Problems solved by technology

[0005] Due to the complex channel of the inner cavity of the product, it is difficult to feed, and the product works under pressure, which requires high density of the base tissue, and no internal shrinkage porosity

At present, the high C and low Si process commonly used in the industry (C3.8~3.9%, final Si less than 2.2%) is a commonly used process to improve casting sinking, and graphite morphology is not good on such thick ductile iron parts.

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