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| Kiss I. |
| REJECT FORMS IN THE CAST IRON ROLLS PRODUCTION BETWEEN THE STATISTICAL RESEARCH AND TECHNOLOGICAL MEASURES IN FOUNDRIES |
Abstract
In our foundries, specialized in the cast iron rolls, in spite of trying the most accurate guidance of the iron melting processes, of the outside treatments melting aggregate, of the moulding and drying of moulds (the so-called casting process), of the cooling and the directional solidification of the castings in the moulds, as well as of the rapping, cleaning and the subsequent processing of the rolls, the performance factor remains relatively low.
The paper presents an industrial study upon reject forms, which appear in the production of cast iron rolls, in iron chill, and try to emphasize the cause of their occurrence in the product making process, and proposes technological measures for their prevent and, in this way, the diminution of the reject percentage. In the paper there is an analysis regarding the nature of this defects and an evaluation of the causes which lead to the rejection of rolls, and some measures of prevent are proposed. The industrial analysis included charges of rolls from different hardness classes (semihard, hard), with definite and indefinite crust, cast in simplex or duplex processes.
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| Keywords: cast iron rolls|reject forms|statistical analyses|hardness classes|rolls’ type| |
| No 2 (2008), p. 307-314 |
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