(Poster session/Short oral-presentation) Earth & Resources

[2107-24-19] Optimizing Rock Cutting Efficiency: Insights from Edge Chipping Test with a Single Button Bit

○Jiacheng Song^{1[Doctoral course]}, Kimihiro Hashiba¹, Katsunori Fukui¹ (1. The University of Tokyo)

Chairperson：鳥屋 剛毅（秋田大学）

Keywords:Edge chipping, Button bit, Rock cutting

In mining and tunneling, the efficiency and cost-effectiveness of rock breakage depend on tools like cutting picks, disc cutters, and drilling bits, making it essential to evaluate their performance and durability. However, traditional cutting and drilling tests are resource-intensive and time-consuming. This study explores the use of edge chipping tests, typically used to assess the toughness of brittle materials, as an alternative method for estimating the peak forces and energy consumption involved in rock cutting. By pressing a single button bit into a rock block near its edge, the study examines the effects of bit size (bit diameter of 6 mm, 8 mm and 15 mm), and cutting distance from the edge on test outcomes, including rock chip size, peak loading force, bit penetration depth, and force-penetration curves. The findings provide valuable insights into the relationship between rock properties, tool dimensions, and test conditions, contributing to the design and optimization of more efficient rock cutting machines.