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Название Service life extension for rock cutters by increasing wear resistance of holders by thermomechanical treatment
DOI 10.17580/gzh.2019.05.13
Автор Bolobov V. I., Chupin S. A., Bochkov V. S., Mishin I. I.
Информация об авторе

Saint-Petersburg Mining University, Saint-Petersburg, Russia:

V. I. Bolobov, Senior Researcher, Professor, Doctor of Engineering Sciences, boloboff@mail.ru
S. A. Chupin, Assistant, Candidate of Engineering Sciences
V. S. Bochkov, Assistant, Candidate of Engineering Sciences
I. I. Mishin, Post-Graduate Student


The effect of high-temperature thermomechanical treatment (HTTT) on abrasive wear resistance of steel 30KHGGSA as the main material to manufacture holder of mining machine cutters is studied. The procedure of HTTT during deformation of cylindrical steel fragments at the preset settling-down rate and subsequent quenching is described. The finite element modeling in DEFORM-3 finds distribution of plastic strain in volume of forged pieces. On the plant based on the upright drilling machine, the abrasive wear resistance of forged pieces is tested on sandstone and siltstone as the medium-hardness and abrasivity co-rocks most frequently met in development heading. It is shown that pre-deformation of the fragments before quenching, i.e. HTTT, imporves the steel hardness from 44 to 55 HRC. It is shown that as against specimens nondeformed before quenching, the abrasive wear resistance of steel subjected to plastic straining up to εΣ ≈ 0.7 increases by 1.9 times in case of both siltstone and sandstone. Considering the obtained results, it is suggested to amend the manufacturing technology of cutters by quenching of fholder forging starting immediately from the forging temperature and by subjecting thereby the holder to high-temperature thermomechanical treatment. The cutting tool cartridge is to be held in the holder by cold pressing. It is assumed that HTTT application can essesntially (two times and more) improve wear resistance of steel holder head and, as a consequence, extend service life of cutters.

Ключевые слова Cutter holder, material, high-temperature thermpomechanical treatment, abrasive wear resistance
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