Step-by-Step Re-grinding of Solid Carbide Drills

Pre-Regrinding Inspection

Inspect cutting edges for damage and wear. Remove large chipped edges using a silicon carbide grinding wheel.

1. Clearance Angle Grinding

Tool: Bowl-shaped diamond wheel (Ø100-200mm, grit 280-400)

1. Grind primary clearance angle θ₂ (refer to Figure 1). Repeat on opposite side with spark-out grinding. Maintain cutting edge height difference ≤0.02mm.
2. DSW-specific: Without rotating drill, grind secondary clearance angle θ₃ after θ₂. Process both sides to form central ridge at drill axis. (See Table 1 for θ₁-θ₃ values)

2. Web Thinning

Tool: Straight diamond wheel (Ø100-200mm, grit 280-400)

• Perform X-type web thinning according to standard procedure
• Refer to Table 2 for β₁-β₃ values

3. Edge Honing

Parameters: Honing angle (θ) and width (H) vary by drill type, diameter, and workpiece material (see specifications table).

Honing Procedure (Reference Figure 3):

1. Rough-rounding of radius (R) area
2. Coarse honing: Use electrodeposited diamond file (grit ~170)
3. Fine honing: Use diamond stone (grit 400-600)