Modeling drill bit wear mechanisms during rock drilling

2021 ◽  
Vol 14 (19) ◽  
Author(s):  
Negin Houshmand ◽  
Ali Mortazavi ◽  
Ferri P. Hassani
Keyword(s):  
Wear Mechanisms ◽  
Drill Bit ◽  
Rock Drilling ◽  
Bit Wear

Construction Ergonomics: Concrete Bit Wear Increases Handle Vibration and Drilling Time

2017 ◽  
Vol 61 (1) ◽  
pp. 969-972
Author(s):  
David Rempel ◽  
Andrea Antonucci ◽  
Alan Barr ◽  
Bernard Martin
Keyword(s):  
Musculoskeletal Disorders ◽  
Test Bench ◽  
Construction Workers ◽  
Exposure Level ◽  
Drill Bit ◽  
Worker Productivity ◽  
Vibration Syndrome ◽  
Bit Wear ◽  
Electric Hammer ◽  
Drilling Time

The use of large electric hammer and pneumatic drills exposes construction workers to high levels of hand vibration that may lead to hand arm vibration syndrome and other musculoskeletal disorders. This hammer drill test bench study demonstrated a small but significant increase in z-axis handle vibration (4.8 to 5.1 m/s2; ISO weighted) and drilling time per hole (7.8 to 12.3 s) with worn concrete bits when compared to a new bit. Drill bit manufactures may consider advising contractors that worn bits will increase the exposure of workers to hand vibration and will reduce worker productivity. Construction contractors should adopt a bit replacement program based on bit wear patterns in order to reduce exposure level and drilling time to hazardous hand vibration.

Development and Verification of a Real-Time Drill Bit Wear Prediction Module

2010 ◽  
Author(s):  
Behrad Rashidi ◽  
Geir Hareland ◽  
Mazeda Tahmeen ◽  
M. Anisimov ◽  
S. Abdorazakov
Keyword(s):  
Real Time ◽  
Drill Bit ◽  
Wear Prediction ◽  
Prediction Module ◽  
Bit Wear

Wear of Uncoated HSS Tools in Drilling Difficult-to-Machine Materials with Water Vapor as Coolant and Lubricant

2011 ◽  
Vol 189-193 ◽  
pp. 3213-3217
Author(s):  
Jian Wu ◽  
Rong Di Han
Keyword(s):  
Water Vapor ◽  
Flank Wear ◽  
Experimental Results ◽  
Cutting Process ◽  
Drill Bit ◽  
Feeding System ◽  
Water Emulsion ◽  
Dry Drilling ◽  
Bit Wear ◽  
Oil Water

Drilling is a semi-enclosed cutting process. Drilling of difficult-to-machine materials generates thermal/frictional damage at the cutting edges of drill bit and decreases the life. In this paper, a new cooling and lubricating technique in drilling difficult-to-machine materials is developed to improve the life of drill bit. For this study, a water vapor generator and feeding system is developed. Comparative experiments are performed for various difficult-to-machine materials under the conditions of oil water emulsion, water vapor as coolant and lubricant and dry drilling, respectively. The effectiveness of water vapor on the basis of drill bit wear is studied. Experimental results show that with water vapor as coolant and lubricant the flank wear is reduced by 45-80% and 10-15% in comparison with dry drilling and oil water emulsion, respectively.

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