Sand-core molding method of ultra-large sand core structural casting

Abstract

The invention relates to a molding method of a large casting, in particular to a sand-core molding method of an ultra-large sand core structural casting. The method comprises the following steps of: coding a sand core; manufacturing the sand core; manufacturing a core box; coremaking; and setting the core. The process method provided by the invention is unique, can avoid partial or large-area size inconsistence of the casting, partial poor shape and hole shrinkage caused by the damaged sand core in the traditional process of making, conveying and setting an ultra-large sand core in a complicated structure and can ensure the product quality and shorten the production period.

Description

technical field [0001] The invention relates to a large-scale casting molding method, in particular to a sand core molding method for super-large sand core structure castings. Background technique [0002] Large steel castings with complex structures have complex shapes, and the inner cavity is composed of many curved surface structures. The structural design of the molding sand core has always been one of the technical problems in the industry. Most of the few domestic manufacturers adopt the molding method of large sand core assembly. The lifting process of heavy sand cores is difficult to control, there are many damaged parts, the size deviation of castings is large, and the cost of molding and cleaning increases. If the damage is serious, the casting will be scrapped. The overall core-making method of such structural castings mainly has the following three disadvantages: size, tonnage, complexity, etc.; It is very inconvenient to transport and place. There is not enoug...

AI Technical Summary

Problems solved by technology

Most of the few domestic manufacturers adopt the molding method of large sand core assembly. The lifting process of the heavy sand core is difficult to control, there are many damaged parts, the casting size deviation is large, and the cost of molding and cleaning increases.

Severe damage leads to scrapping of castings

The overall core-making method of such structural castings mainly has the following three disadvantages: size, tonnage, complexity, etc.; It is very inconvenient to transport and place. There is not enough good space to place such a large sand core, and the sand core will be damaged to varying degrees during the process of lifting and placing.

The production cycle is more than 1 month; 2) The structure of the sand core and its own weight determine that the strength of the core bone cannot meet the standard requirements, and there will be a certain degree of deformation during the lifting and placement process, which will cause the sand core to match the size during the core setting process If it does not match, it is very difficult to adjust. When the deformation size is particularly large, the core cannot be lowered into the cavity, and the sand core is scrapped to produce a new one; 3) The sand core structure is unreasonable and impacts occur during the core setting process, causing more damage to the sand core

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