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Filtering method for eliminating cast iron thermal analysis curve interference

A thermal analysis, curve technology, used in signal processing, steel casting fields

Inactive Publication Date: 2014-05-28
NANJING NO 4 ANALYTICAL INSTR
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The problem to be solved by the present invention is: in order to realize high-precision online analysis of molten iron composition and remove interferences such as ripples and burrs in the thermal analysis curve of cast iron, it is necessary to process the thermal analysis process, and it is necessary to accurately retain the original change law of the curve , but also to remove the influence of interference, because the traditional filtering method smoothes the curve as a whole while removing the burrs, the processed curve will make the temperature change moderate, which is not conducive to the liquidus temperature and solidus temperature. Extraction of a key temperature point

Method used

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  • Filtering method for eliminating cast iron thermal analysis curve interference
  • Filtering method for eliminating cast iron thermal analysis curve interference
  • Filtering method for eliminating cast iron thermal analysis curve interference

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Embodiment Construction

[0032]The unique filter method proposed by the invention for thermal analysis of cast iron not only removes the burrs in the curve but also retains the characteristics of severe temperature changes by separately processing the burrs and the sharp temperature change points. Improve the extraction accuracy of liquidus temperature and solidus temperature, including the following steps:

[0033] 1) Collect the cast iron temperature with a sampling period of less than 0.25 seconds;

[0034] 2) Take a continuous temperature collection point, the number is N, and the value of N is an integer from 5 to 10, and the area where the N temperature collection points are located is called the filter window, that is, the filter window is a filter window containing N temperature collection points the curve area of ​​the point;

[0035] 3) According to the filter window parameter N and the collected temperature data, the original filter sequence {T 1 , T 2 ,... T N-1 ,T N};

[0036] 4) Ta...

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Abstract

The invention relates to a filtering method for eliminating cast iron thermal analysis curve interference. A filtering window is arranged to filter curves in the window in different conditions, and the filtering of a thermal analysis curve is finally completed. According to the filtering method disclosed by the invention, each temperature spot on the thermal analysis curve is firstly judged to be a burr, a peak or an intrinsic temperature jump. The interferences of the burr and the peak are filtered, and the intrinsic temperature jump is retained. After the filtering treatment, the information of the intrinsic temperature jump is retained while the burr is removed, the thermal analysis curve is smoothed, and accuracy of analysis on contents of carbon and silicon is improved.

Description

technical field [0001] The invention belongs to the technical field of iron and steel casting and signal processing, and mainly relates to the smoothing filter used for the analysis of the temperature curve of molten iron in order to realize the online monitoring of liquid iron quality and improve the analysis accuracy of carbon and silicon content in cast iron in the iron casting process. A filtering method to eliminate the interference of cast iron thermal analysis curves. Background technique [0002] The on-line detection of molten iron composition requires rapid and accurate detection results of molten iron composition in order to adjust the chemical composition of molten iron online. General chemical analysis methods are difficult to meet the speed requirements of on-line detection. Thermal analysis method is to measure the temperature change of accompanying substances It is a method to determine the thermal changes of the material structure and the chemical reaction c...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N25/20
Inventor 赵敏姚敏杨绍雨
Owner NANJING NO 4 ANALYTICAL INSTR
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