Journal of Jilin University(Earth Science Edition) ›› 2017, Vol. 47 ›› Issue (1): 197-202.doi: 10.13278/j.cnki.jjuese.201701206

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Strength Analysis of New Kinds of RC Drill Bit and Its Experimental Study

Wu Dongyu, Yin Kun, Gan Xin, Zhang Xinxin, Yin Qilei   

  1. College of Construction Engineering of Jilin University, Changchun 130026, China
  • Received:2016-05-18 Online:2017-01-26 Published:2017-01-26
  • Supported by:
    Supported byChina Geology Survey Project(12120113096900)

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Abstract: For the problem of dust pollution and coring for diamond drilling in mine area, which can not meet the requirement of drilling core, in this paper,a drilling system named RC DTH hammer is used to instead of diamond drilling method. With a high drilling efficiency, the RC DTH hammer drilling method overcome the problems in mine area, especially for the pollution, core, and the health of workers. In order to make full use of the method, two new RC bits are designed and applying software LSDYNA to analysis the strength of the structures of two bits. The two drill bits made good performances in the field tests, however, the bit with nozzle holes in splines broke frequently during drilling. The simulation consequence showed that the stress of RC bit with nozzle holes in splines has much larger than the allowed value of fatigue limit of 35CrMo, which is the primary cause to this test failure. The conclusion of simulation is in great agreement with that of field test, proving that the ring slot should not be designed nearby the nozzle hoes when designing a RC drill bit.

Key words: hollow-through DTH hammer, strength analysis, continuous coring, RC drill bit, LSDYNA

CLC Number: 

  • P634
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