Effects of weight on bit and rotational speed on the friction and wear properties of Fe based diamond bit matrix

Abstract

All-hydraulic drill has been widely employed in core drilling recently, which results in larger Weight on Bit (WOB) and higher rotational speed to diamond bit. Thus, new requirements of diamond bit abrasiveness are needed to satisfy the severe challenges. To investigate the effects of WOB and rotational speed on the friction and wear properties of diamond bit matrix, an experimental scheme with 2 factors and 4 levels was designed to carry on the friction and wear test, and two kinds of Fe based diamond bit matrix formula systems, i.e. elemental metal powders and pre-alloyed powders were considered. The samples were manufactured by hot-pressing. Test results indicate that the abrasion loss of the Fe based samples increase with the raise of WOB and rotational speed, while the WOB has a bigger significance. The wear mechanism of the bit matrix is dominated by adhesive wear under smaller WOB and lower rotational speed, while abrasive were will become more and more important with the increase of WOB. Besides, samples from the pre-alloyed powders formula system have better performance than the ones from elemental system, the abrasion can be reduced by up to 15.52%, when under the same test conditions.

Keywords:

• Diamond bit
• all-hydraulic drill
• weight on bit
• rotational speed
• friction and wear

Additional information

Funding

This work was financially supported by the open Research Funds for the Shandong Lunan Geological Engineering Survey Institute (No. LNY2020-Z07).