Open AccessAssessment of units’ performance of CCM technological line
Author(s) -
А. Н. Савельев,
S. S. Sever’yanov
Publication year - 2020
Publication title -
izvestiâ vysših učebnyh zavedenij. černaâ metallurgiâ
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.3
H-Index - 7
eISSN - 2410-2091
pISSN - 0368-0797
DOI - 10.17073/0368-0797-2019-12-972-978
Subject(s) - operability , reliability (semiconductor) , reliability engineering , performance indicator , work (physics) , working time , computer science , statistics , mathematics , operations management , mechanical engineering , engineering , power (physics) , physics , management , quantum mechanics , economics
To assess operational reliability of technological units of continuous casting machine (CCM), quantitative indicator of efficiency has been applied. This indicator of efficiency describes ability of technical product to perform work assigned to it with a certain probability, or expectancy that this amount of work will be performed. This indicator is interesting for its optimal value, which being surpassed decreases machine ability to perform the necessary amount of work. Thus, the optimum point of machine operating time limits rational time portion of its use without repair with maximum efficiency. Workability of CCM as technological line as well as operability of its units was evaluated using statistical material obtained during the 15 years of operation of billet CCM. So, all units were divided into three essentially different groups according to conditions of their appointment, i.e. a group of units working with liquid metal, a group of units working with solidifying metal and a group of units working with solidified metal. Performance of each group of units is estimated in absolute and relative values. When assessing performance of CCM units in absolute values, units operating with liquid metal have the greatest performance. Its rational service life from repair to repair is 270 hours with reliability of 0.51. The smallest efficiency was manifested in units working with solidified metal. Its performance lasts 150 hours with reliability of 0.6. Average efficiency in relative units of all groups of aggregates is almost the same, which makes it possible to use this indicator at an early stage of assessing efficiency of both machine units and CCM as a whole.