Study on Rock Breaking Law of Anisotropic PDC Teeth

Xiuyan Wei ； Nannan Zhou ； Jiahui Xu ； Yong Cai ； Xu Zhao ； Nailiang Bao ； Shuang Wang

《International Core Journal of Engineering》 8卷10期 (2022/10) Pp. 257-265

https://doi.org/10.6919/ICJE.202210_8(10).0037

摘要

The indoor single tooth rock breaking experiment and numerical simulation of rock breaking are carried out for plane teeth, sharp round teeth and axe teeth. The effects of different penetration depth and rake angle on the rock breaking efficiency of PDC teeth are analyzed. Analyze the experimental results and simulation results: the trend of experimental results and simulation results is the same. Secondly, through the extraction and comparison of data, the maximum error of data is 9% and the minimum error is 1%, so it is considered that the analysis method is effective; Increasing the feed depth of PDC teeth will increase the cutting force of PDC and the volume of broken rock; Under the same conditions, the volume of rock broken by plane teeth is larger than that of axe teeth and sharp round teeth, and the cutting force of axe teeth is greater than that of the other two teeth; The best rock breaking conditions of plane teeth, sharp round teeth and axe teeth of broken sandstone are rake angle 15 °, depth 1mm, rake angle 5 °, depth 2mm and rake angle 20 °, depth 3mm; Comprehensively comparing the effect of three teeth in crushing sandstone, the axe type has the best crushing effect. Then the three kinds of teeth are simulated for rock breaking. It is found that the tooth distribution method of front special-shaped teeth and back plane teeth will lose the attack power of special-shaped teeth and reduce the rock breaking efficiency.

關鍵字

Non Planar Teeth ； Indoor Single Tooth Experiment ； Numerical Simulation ； Eat Deep ； Rake Angle

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