Apr

Carbide Roll Ring Grinding | Diamond Wheel Solutions & Parameters Optimization

Carbide roll rings are critical components widely used in high-speed wire rod mills, bar rolling mills, and non-ferrous metal processing. Typical grades include YG6, YG8, YG15, and YL10.2.

Due to their high hardness (HRA 86–92), high wear resistance, and relatively low fracture toughness (8–15 MPa·m¹/²), carbide materials present significant challenges in grinding—especially when both high efficiency and high precision are required.

carbide roll rings TC rings

To overcome these limitations, a systematic grinding solution is essential, combining:

Diamond grinding wheel customization
Optimized process parameters
Controlled thermal management

1. Challenges in Carbide Roll Ring Grinding

1.1 Material Characteristics

Carbide roll rings exhibit:

Hardness: up to HV 1300–1800
Low fracture toughness → prone to micro-cracks
Thermal sensitivity → risk of grinding burn
Key Challenges:

✔ Rapid abrasive wear with conventional wheels
✔ Crack initiation under grinding stress
✔ Heat accumulation causing surface damage
✔ Difficulty maintaining roundness (≤2 μm)

1.2 Engineering Strategy

To achieve stable grinding performance:

Use diamond abrasives (HV 8000–10000)
Minimize thermal load with optimized parameters
Control grinding force using fine grit and elastic bonds

2. Diamond Grinding Wheel Design

2.1 Abrasive Selection & Grit Size

Diamond is the only effective abrasive for carbide machining.

Recommended Grit Sizes:

Rough grinding: D91–D126 → high material removal
Semi-finishing: D46–D64 → dimensional control
Finishing: D15–D30 → Ra ≤ 0.2 μm
Super-finishing (optional): D7–D10

2.2 Bond Selection Strategy

Different grinding stages require different bond systems:

Vitrified Bond Diamond Wheel

High rigidity
Excellent shape retention
Ideal for rough & semi-finishing

Resin Bond Diamond Wheel

Good elasticity
Superior surface finish
Best for finishing processes

Metal Bond Diamond Wheel

Ultra-long life
Suitable for profile grinding

2.3 Concentration & Structure Optimization

Rough grinding: C100–C125
Finishing: C75–C100

Porosity design:

Resin bond: 10%–25% porosity
→ Improves cooling and chip removal

3. Grinding Parameters Optimization

Stage	Wheel Speed (m/s)	Depth of Cut (mm)	Feed Rate (mm/min)
Rough	20–25	0.01–0.03	300–600
Semi	25–30	0.005–0.015	200–400
Finish	30–35	0.001–0.005	100–200

Cooling System

Coolant: Synthetic (3–5%) or emulsion (5–8%)
Flow rate: 60–100 L/min
Pressure: 6–10 bar
Filtration: ≤10 μm

4. Typical Grinding Process (Case Study)

Material: YG8 Carbide Roll Ring
Size: Ø300 mm × Width 100 mm

Process	Wheel Type	Key Parameters	Target
Rough	Vitrified D91 (C125)	ap=0.025 mm	Remove 0.3–0.5 mm
Semi	Vitrified D46 (C100)	ap=0.012 mm	Improve geometry
Finish	Resin D20 (C75–100)	ap=0.003 mm	Ra ≤ 0.2 μm
Spark-out	Same wheel	No infeed	Stabilize size