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IX - MR control chart as a tool in assessment of the cast iron properties stability

Binczyk F., Szymszal J., Smoliński A.

Archives of Foundry Engineering

2007

Vol. 7, iss. 3

25-28

for casting of brake discs. Some specific characteristics were presented that should be taken into consideration when statistical methods are used for technology improvement. The stability of the cast iron melting process was evaluated using data read out from the thermal analysis curve and true data, i.e. the results of spectrometric analysis of the chemical composition and measured values of the mechanical properties. The method for assessment of process stability was discussed on the example of carbon content and Brinell hardness. The examined parameters of the technological process of grey iron melting and casting are independent of each other (the results of carbon content determination in successive melts, the results of hardness measurements, etc.). Therefore, for analysis, the IX - MR type charts were chosen, where single measurements of the selected property (n=1) serve as a measure of location, while a measure of variability are the, so called, Moving Ranges (MR), which are an absolute value of the difference between the two successive measurements.