Uniformity and comprehensive quality evaluation of steel product via process capability index and TOPSIS

ABSTRACT

The overall quality of the steel wire is composed of the mechanical properties, the key process parameters, the geometrical parameters, surface quality, etc. A uniformity and comprehensive quality evaluation method of steel product based on the improved process capability index and TOPSIS (Technique for Order Preference by Similarity to Ideal Solution) is proposed. First, the uniformity of the process parameters is described by the volume ratio between the process data area and the specification area which is calculated via kernel density estimation. The relative closeness of the newly added batches is obtained by TOPSIS, which is used as a comprehensive quality evaluation index. A time dimension is added to the radar chart to visualize high-dimensional data, which is intuitive to compare the differences between batches. The results show that the evaluation method can accurately obtain the uniformity and comprehensive quality of steel products.

KEYWORDS:

• High-speed wire
• process capability index
• kernel density estimation
• radar chart
• TOPSIS
• quality evaluation
• comprehensive evaluation
• data visualization

Disclosure statement

No potential conflict of interest was reported by the author(s).

Additional information

Funding

This research is supported by the National Key Technology R&D Program of the 12th Five-year Plan of China [Grant number 2015BAF30B01] and the Fundamental Research Funds for the Central Universities [Grant number TW201711].