Field Case Study: Full-Blade Roof Bolt Bits

Stable structure after 56 m drilling in f=10 limestone inclined-shaft conditions

Mine type	Inclined shaft
Application	Anchor cable holes and anchor bolt holes
Bit model	φ32 two-wing PDC anchor bit, full-piece type
Equipment	MYT-140
Cooling method	Water cooling

Formation type	Limestone
Rock hardness	f=10
Thrust force	9 kN
Rotation speed	240 r/min
Total footage	56 m
Completed holes	6 anchor cable holes × 6.2 m; 13 anchor bolt holes × 1.4 m

Performance After Field Use
- After 56 m of accumulated drilling, the bit maintained good overall structural integrity.
- The two-wing profile remained clear, with no obvious structural fracture.
- The PDC cutting area showed stable wear performance, with wear concentrated in the normal working contact zone.
- The wing support area remained in good condition, indicating reliable wear resistance.
- The threaded connection area stayed intact after continuous drilling.
- Under f=10 limestone hard-rock conditions, the product demonstrated strong durability and field reliability.

Before Use

Unused φ32 two-wing PDC anchor bit, showing the original cutting structure, wing profile, and threaded connection area.

After Field Use

Our product after 56 m drilling in f=10 limestone inclined-shaft conditions, showing stable structure and controlled wear.

Key Advantages
- Strong hard-rock adaptability: Suitable for f=10 limestone and other high-hardness formations.
- Stable wear resistance: Controlled wear after long-distance drilling.
- Good structural retention: Wing profile, support area, and thread section remained intact.
- Reliable impact resistance: Designed for continuous drilling under demanding inclined-shaft conditions.
- Improved drilling continuity: Helps reduce bit replacement frequency and improve on-site efficiency.