Views: 0 Author: Site Editor Publish Time: 2021-08-11 Origin: Site
The defect analysis and failure analysis of large forged parts mainly include two aspects: determining the nature of the defect and clarifying the relationship between the defect and the failure and the cause. There are many reasons for the failure of forged parts in service, including an improper selection of materials, metallurgical defects of materials (metallurgical quality), mechanical processing and assembly quality problems, working environment, load conditions, improper use and operation, negligence in maintenance, and design Unreasonable, etc., may cause the failure of mechanical products. The occurrence of forged parts defects is closely related to the process. It is necessary to correctly identify the nature of the defect and determine the cause of the defect. Not only must one be familiar with the detection technology, use the correct analysis method, master the macro and micro characteristics of the defect, but also understand the defect caused by The process and the connection between it and the craft.
Here is the content list:
l Analysis basis for defects of large forged parts.
l The analysis process of defects in large forged parts.
l Investigation and research on the design, processing, installation, load-bearing, and use conditions of large forgings.
l Mathematical statistics of large forged parts.
The data of quality inspection and defect detection of large forged parts and the understanding of each production process are the basis of analysis. First of all, we must fully observe the defect morphology or failure damage surface, grasp the characteristics of the defect distribution or the characteristics of the failure damage location, comprehensively analyze the problems that occur during the manufacturing process and the use process, and conduct analysis, research, and judgment.
Firstly determine the nature of defects or failures of large forged parts, clarify the period of defects or failures, and then analyze the types and types of defects in the original large forged parts caused by defects or failures, which can be divided into composition, structure, second phase, and porosity in nature. There are five types of sexual defects and cracks. It is generally not difficult to determine the nature of these defects, and it is often very complicated to analyze the causes of defects. It may be the result of a single factor, or it may be the result of multiple factors at the same time. Therefore, the analysis process must be linked to the actual situation of the production process, and some confirmatory experiments or further inspection and analysis must be done to reach the correct conclusion.
For the failure analysis of large forged parts, in addition to the inspection and analysis of the defects of the material itself, the cold working condition, design structure, and calculation parameters, rationality of material selection, equipment installation, load-bearing conditions, use environment, use medium, operation, and maintenance must also be considered comprehensively. Investigate. In addition, in-depth on-site investigations are also crucial for judging the cause of failure.
It is a relatively scientific method to use mathematical statistics to analyze the causes of defects in mass-produced large forged parts. Master a large amount of testing data and actual production process parameters. As long as there are enough statistical samples, regression analysis can be used to understand the influence of various factors on the formation of defects from the correlation coefficient.
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