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Critical Failure Analysis of Lower Grinding Ring of Ball and Race Mill

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Advances in Manufacturing Engineering and Materials

Abstract

This paper highlights a methodology for failure analysis of cast grinding ring of a ball and race mill. It investigates the root cause of premature failure of cast grinding ring. The grinding ring was made of Ni Hard IV. Grinding ring of ball and race mill failed after giving the life only 2861 running hours. It was premature failure against the required useful life of 6500 running hours. The process of critical investigation of failure analysis includes visual observation, chemical analysis, microstructure analysis, and evaluation of hardness, analysis of erection process and operational analysis. The cast ring was failed with the indication of direct separation of surface from the outer periphery of ring. No evidence of faulty chemical composition, microstructure and erection procedure were observed. Hardness was found around 400 BHN and inadequate spring pressure on ring was also observed during operation of ball and race mill which had caused the radial movement of the ball in ball track of the lower ring, resulting radial thrust on the collar of the ring and it failed from that area.

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Correspondence to Gagan Kumar Guptaa .

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Guptaa, G.K., Chattopadhyayab, S. (2019). Critical Failure Analysis of Lower Grinding Ring of Ball and Race Mill. In: Hloch, S., Klichová, D., Krolczyk, G., Chattopadhyaya, S., Ruppenthalová, L. (eds) Advances in Manufacturing Engineering and Materials. Lecture Notes in Mechanical Engineering. Springer, Cham. https://doi.org/10.1007/978-3-319-99353-9_27

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  • DOI: https://doi.org/10.1007/978-3-319-99353-9_27

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  • Publisher Name: Springer, Cham

  • Print ISBN: 978-3-319-99352-2

  • Online ISBN: 978-3-319-99353-9

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