Service life increasing of cold saws by heat treatment

Authors

  • О. V. Uzlov State Higher Educational Institution ''Prydniprovska State Academy of Civil Engineering and Architecture'', Ukraine https://orcid.org/0000-0003-1329-5576
  • H. V. Drozhevska State Higher Educational Institution ''Prydniprovska State Academy of Civil Engineering and Architecture'', Ukraine https://orcid.org/0000-0001-5781-285X
  • O. V. Puchykov Iron and Steel Institute named after Z. I. Nekrasov of the National Academy of Sciences of Ukraine, Ukraine
  • I. S. Hrechka State Higher Educational Institution ''Prydniprovska State Academy of Civil Engineering and Architecture'', Ukraine

DOI:

https://doi.org/10.30838/J.PMHTM.2413.241219.10.595

Keywords:

cold saw, heat treatment, service life, ''scorin'' defect, ''cut'' defect, hardness, quenching

Abstract

Purpose of the study. To determine the possibility of increasing of service durability of cold saws by heat treatment of saw’s teeth. Develop the optimal heat treatment modes in order to obtain the higher service durability of cold saws. Develop the optimal heat treatment mode into industrial practice of cold saws’ treatment. Methodology. Investigation of the structure of cold saws has been carried out using light microscopes Neophot 32 and Axiovert 200M MAT with AxioVision 4.6.3 software. The hardness of cold saw’s teeth has been assessed by Vickers method. Microhardness has been determined by PMT-3 test equipment. Results. The experimental cold saws have been treated by 5 different modes. Two modes of heat treatment have been acknowledged as promising for industrial practice. Technology of cold saw’s teeth heat treatment has been developed. The technology let to increase the service durability of cold saws up to 2,58 times, compared to non heat treated cold saws. Scientific novelty. It has been found that hardness of martensitic and wide of semimartensitic zones mainly determine the service durability of cold saws and decreasing of “scoring” and “cuts” defects number during cutting process. Experimental results evidently prove that hardness of martensitic zone and width of transition zone determine the service durability of cold saws. Initial hardness of the steel had lesser impact on service durability of cold saws. Practical significance. The developed technology leads to increasing of service durability of cold saws. The technology lets to obtain the hardness of the tooth surface up to 62 HRC and wide semimartensitic zone. Developed technology leads to increasing of service durability cold saws in 2,58 times (2,5 shifts) compared with non treated cold saws.

Author Biographies

О. V. Uzlov, State Higher Educational Institution ''Prydniprovska State Academy of Civil Engineering and Architecture''

Department of Materials Science, Cand. Sc. (Tech.), Ass. Prof.

H. V. Drozhevska, State Higher Educational Institution ''Prydniprovska State Academy of Civil Engineering and Architecture''

Department of Materials Science, Assistent

O. V. Puchykov, Iron and Steel Institute named after Z. I. Nekrasov of the National Academy of Sciences of Ukraine

Senior Research Assistant

I. S. Hrechka, State Higher Educational Institution ''Prydniprovska State Academy of Civil Engineering and Architecture''

Department of Materials Science, Student

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Published

2019-12-27

Issue

No. 4 (2019): Metal Science and Heat Treatment of Metals

Section

Technical science

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