Method for analyzing internal defects of large forge piece

Abstract

The invention discloses a method analyzing internal defects of a large forge piece. According to the method, the comprehensive analysis of defects can be carried out in processes of steel ingot casting, forge piece forging and heat processing. The method comprises the steps of defect flaw detection and analysis on the forge piece after preprocessing, defect analysis in the forging process, defect analysis in the casting process, and defect analysis in the heat processing process. The method which combines a value simulation technology with a traditional defect examination method and adopts a node tracking technology to associate the steel ingot casting with the forging and the heat processing makes the defect analysis of the large forge piece be accurate and scientific, and continuous improvement of the quality of the large forge piece be realized, and is especially suitable for the popularization and the application in the processing technology of large forge pieces.

Description

technical field [0001] The invention relates to the field of free forging, in particular to a method for analyzing internal defects of large forgings. Background technique [0002] At present, large-scale forgings are the foundation of the heavy machinery manufacturing industry. They are large in shape and heavy in weight, and are mostly produced in small batches of single pieces. The production cycle is long, the quality requirements are high, and the production management is complicated. With the rapid development of petrochemical, electric power, metallurgy, transportation and other industries, large-scale forgings and high standardization have become an inevitable trend in the development of the forging industry in the future, which makes it more and more difficult to meet the quality requirements of large forgings, forcing the forming process of large forgings Design must constantly evolve forward. First of all, the increase in the weight and size of forgings directly ...

AI Technical Summary

Problems solved by technology

First of all, the increase in the weight and size of forgings directly leads to a corresponding increase in the steel ingots used to manufacture these forgings, and with the increase in the tonnage and cross-sectional area of ​​steel ingots, defects related to the metal crystallization process, such as non-metallic inclusions, segregation, loose structure, The more obvious the shrinkage cavity, etc., will bring great difficulties to the product qualification rate of large forgings; secondly, with the increase of the weight and size of forgings, the forming capacity and on-site operation of the existing equipment cannot meet the requirements of forgings forming, resulting in incomplete compaction , operation difficulties and other issues; the increase in the weight and size of forgings also leads to difficulties in heating and heat treatment of forgings

At a certain stage of forming, the geometric dimension of the forging may exceed the size of the heating furnace, resulting in problems such as lowering of the temperature of the forging, prolonging the heating time, and obvious uneven heating, leaving hidden dangers for the forming process; the continuous emergence of new materials and the shortening of the product production cycle Shortening is also an important reason for the decline in the pass rate of forgings. The inability to fully grasp the forging and heat treatment properties of materials makes the process determination blind

Due to the limitations of different professions, the current research on large forgings is divided into three parts: steelmaking, forging, and heat treatment, each of which is independent, and it is impossible to conduct systematic analysis and research on forging defects

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