Improving and testing of quality management method of the plates

Abstract

Kurpe O. H., Kukhar V. V., Prysiazhnyi A. H. Improving and testing of quality management method of the plates. Material working by pressure. 2020. № 1 (50). P. 228-235.

An analysis of modern approaches to improving product quality indicators was performed. Improving of product quality management approaches is a relevant task for the metallurgical enterprises of Ukraine. The systematic using of these approaches is also a relevant task at all stages of production.

The method of product quality management was proposed in the article. This method is based on the combination of ISO and Lean systems. This method includes the establishment and determination of technological parameters values that affect the quality of products. This method also includes monitoring, accumulation, processing of the technological parameters data and mechanisms for improving product quality.

The effectiveness of the product quality management method has been evaluated. The assessment was performed for the conditions of rolling plates of 14 mm thickness from K60 steel at the 3600 rolling mill of the integrated iron-and-steel works «Azovstal». The mechanical properties of the metal were used for evaluating of the effectiveness of the product quality management method. Statistical processing of the basic technological process data showed that using of accelerated cooling did not provide the necessary mechanical properties of the plates. The values of the technological parameters of rolling were proposed in the article based on the product quality management method. These values of technological parameters provided the stable quality indicators of the plates. As a result, obtaining of the plates mechanical properties has become possible in accordance with the requirements of the standards. Standard deviation of yield strength decreased by 44 percent; standard deviation of ultimate strength decreased by 31 percent; standard deviation of elongation decreased by 46 percent. This indicates the increasing of the technological process stability and the effectiveness of the product quality management method.