Dependence of the lifelength of a hydraulic hammer pick on the wear resistance of its material

The article presents the experimental data on the blow energy impact on the rate of percussion–abrasion wear of a prototyping conical pick made of instrumental steel of three different grades in percussive interaction with granite block. A part of the tool was subjected to standard thermal treatment practiced at pick manufacturing plants, the other part was exposed to cold or cryogenic treatment. For validating extensibility of the test data to the in-situ conditions, the experimental parameters were set to be such that to be similar to the working conditions of the hydraulic hammer pick. In order to reach the similarity, the level of the contact stresses between the prototyping tool and rock in the tests was the same as in the real-life percussive penetration of the pick. The dependence between the rate of percussion–abrasion wear resistance and blow energy of the prototyping tool was determined, and the wearability rates were calculated for the pick of hydraulic hammer JCB HM380 in destruction of granite blocks. The pick lifelength was assumed as the number of blows made by the pick until total wear of its tip. From the comparison of the lifelength of picks made of the test steel grades and subjected to the mentioned thermal treatment, the conclusion is drawn that it is expedient to introduce the low-temperature and cryogenic treatment in the manufacturing technology of picks for hydraulic hammers.

Keywords: hydraulic hammer pick, percussion, blow energy, granite, percussion–abrasion wear, contact stress, tip dulling, cold treatment, cryogenic treatment, pick lifelength.
For citation:

Bolobov V. I., L. Thanh Binh, Chupin S. A., Plashchinsky V.A. Dependence of the lifelength of a hydraulic hammer pick on the wear resistance of its material. MIAB. Mining Inf. Anal. Bull. 2020;(5):68-79. [In Russ]. DOI: 10.25018/0236-1493-2020-5-0-68-79.

Issue number: 5
Year: 2020
Page number: 68-79
ISBN: 0236-1493
UDK: 620.172.2
DOI: 10.25018/0236-1493-2020-5-0-68-79
Article receipt date: 12.12.2019
Date of review receipt: 30.01.2020
Date of the editorial board′s decision on the article′s publishing: 20.04.2020
About authors:

V.I. Bolobov1, Dr. Sci. (Eng.), Professor, e-mail:,
Le Thanh Binh, Researcher, Vinacomin, Institute of Energy and Mining Engineering (IEMM), Hanoi, Socialist Republic of Vietnam,
S.A. Chupin1, Cand. Sci. (Eng.), Assistant Professor,
V.A. Plashchinsky1, Graduate Student,
1 Saint-Petersburg Mining University, 199106, Saint-Petersburg, Russia.


For contacts:

V.I. Bolobov, e-mail:


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