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Study of Analysis Model of the Internal Quality Defect for the Continuous Casting Billet Based on Standard Analysis

Author: MengQingZuo
Tutor: XieZhi
School: Northeastern University
Course: Measuring Technology and Instruments
Keywords: Slab Internal quality defects Fault tree analysis Standardized analytical Statistical Process Control Xbar-R diagram
CLC: TG245
Type: Master's thesis
Year: 2009
Downloads: 35
Quote: 0
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Abstract


Slab is an important product in the metallurgical process, the quality of the slab is the common goal of metallurgical enterprises. In the actual production process, due to the production of improper implementation of the process parameters, product quality defects often. Vary as a result of the actual situation, leading to the execution of the production process parameters is difficult to have a uniform standard, rather than in line with the situation at the scene of the production process parameters to produce the main reason for product quality defects. The need for the actual production of a best adapted to the actual on-site production process standards to guide the production in order to reduce the product quality defects, analysis of product quality should be established on the basis of standardized process. In view of this situation, this paper established internal slab quality analysis model based on process standardization. Standardized analysis of standardized analysis and adjustment module for continuous casting production process parameters, and standardized analysis based on the quality of the product. In this paper reads as follows: (1) analysis of the reasons for the formation of the internal slab quality defects, the establishment of the internal slab quality analysis model. Starting from the composition of molten steel and continuous casting process, the critical strain theory steelmaking to continuous casting slab internal crack stage fault tree. Billet internal quality from steelmaking to casting process basic factors through qualitative analysis of the fault tree analysis software 26 minimal cut sets. (2) The use of statistical process control methods standardized analysis and adjustment of the continuous casting process parameters. Standardized analysis of a steel plant in July 2006, 30,000 continuous casting process parameter data using standardized analysis module. The use of statistical process control (SPC) methods Xbar-R chart to determine the the 7 process parameters of the continuous casting process standards limit and draw out the execution of each process parameters curve. Recording the parameters of the non-controlled processes, the failure rate of each of the process parameters were calculated. Determine the standard process parameters limit the plant in July in the continuous casting process heat 267 furnace continuous casting process standardization adjustment of process parameters, after six consecutive times to adjust the basic non-controlled process parameters adjusted to the standard limits. (3) research weight relations between the continuous casting process parameters and the slab in the steel mills on the basis of standardized analytical internal quality status analysis. Select three objective weighting method the right to re-process parameters relationship calculated by quantitative calculation results selected multiple correlation coefficient method to empower operation process parameters. The parameter weights combined with standardized analytical process parameters failure rate slab internal quality analysis model for the quantitative analysis of the probability of occurrence of internal cracks of 22.57%. With the actual low detection results 20.62% compared to just under 1.95%, verify this build internal quality analysis of the accuracy of the model. Before analysis with standardized quantitative calculation of the the resulting internal cracks probability of 23.45% compared to verify the accuracy of internal slab quality analysis process parameters standardized analytical model more.

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CLC: > Industrial Technology > Metallurgy and Metal Craft > Casting > Casting process > Casting defects and their prevention
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