Issue 42

J.-f. He et alii, Frattura ed Integrità Strutturale, 42 (2017) 263-271; DOI: 10.3221/IGF-ESIS.42.28 263 Study on the abrasion property of the anvil inside a hydraulic DTH hammer fitted with horizontal oriented sliders Jiang-fu He State Key Laboratory of Coal Mine Disaster Dynamics and Control, College of Resources and Environmental Science, Chongqing University, Chongqing 400030, China Post-doctoral Research Station of Mineral Engineering, Chongqing University, Chongqing 400030, China hejf2016@cqu.edu.cn ; http://orcid.org/ 0000-0002-6581-9709 Qi-lei Yin * , Kun Yin College of Construction Engineering, Jilin University, No. 6 Ximinzhu Str., Chaoyang District, Changchun, 130021,China yinql_jlu@126.com, yinkun@jlu.edu.cn A BSTRACT . Hydraulic hammers have been extensively applied to horizontal directional well drilling in hard rock formations. However, the service life of a hydraulic hammer is still unsatisfactory due to the heavy wear or abrasion of the horizontal anvil, which leads to the failure and the reduction of service life in directional well drilling. In order to improve the performance life of a hydraulic hammer, the new type of anvil with a horizontal oriented slider has been designed. The abrasion property of the horizontal oriented slider have been numerically simulated and analyzed by Finite Element Analysis. Simulation and experimental results have shown that the abrasion rate exponentially varies with the mass of the anvil and the friction coefficient of horizontal oriented slider, nevertheless the abrasion rate of horizontal anvil is almost logarithmically varies with moving velocity of oriented slider. The maximum abrasion rate of horizontal oriented sliders will exceed 4% while moving velocity of the horizontal anvil is larger than 3m/s. While the mass of the anvil is 100kg, the maximum abrasion rate of horizontal oriented slider is 7.5 ‱ . However, the maximum abrasion rate of a horizontal oriented slider will be up to 16.5% while the friction coefficient is more than 0.2. K EYWORDS . Horizontal oriented slider; Hydraulic hammer; Anvil; Abrasion rate; Directional well drilling. Citation: He, J.-f., Yin,.Q., Yin, K., Study on the abrasion property of a hydraulic hammer with horizontal oriented sliders, Frattura ed Integrità Strutturale, 42 (2017) 263-271. Received: 20.05.2017 Accepted: 13.08.2017 Published: 01.10.2017 Copyright: © 2017 This is an open access article under the terms of the CC-BY 4.0, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited. I NTRODUCTION s a percussive and rotary drilling tool, the hydraulic DTH hammer with a fluidic amplifier has been extensively applied to geological core drilling, hydrological well drilling, trenchless drilling, oil and gas well drilling [1, 2]. due to the high penetration rate, low occurrence of drilling accidents and excellent borehole quality in drilling, the A