Over time, asphalt and concrete roadways suffer from rutting, surface cracking, and structural fatigue under heavy traffic and environmental weathering. Rather than completely reconstructing entire road beds, municipal highway departments rely on road milling (also called cold planing or asphalt pavement profiling) to restore road surfaces efficiently. Today, we examine how cold milling works and explore the crucial wear components that drive milling productivity.
How Road Milling Works
Road milling is the controlled removal of worn asphalt or concrete pavement layers to a specified depth and grade:
- Drum Rotation: A heavy, rotating cutter drum equipped with hundreds of tungsten carbide pick tools (milling teeth) impacts the pavement at high speeds.
- Material Fracture: The conical carbide tips penetrate the pavement matrix, shattering bound aggregate and asphalt binder into small, recyclable millings (Reclaimed Asphalt Pavement or RAP).
- Conveyor Discharge: Internal gathering belts transfer RAP millings directly into attending dump trucks for transport to recycling plants.
- Surface Texturing: The rotating drum leaves a uniform, micro-milled surface texture ideal for bonding new asphalt overlays.
Anatomy of a High-Performance Road Milling Tooth
Operating inside a cold planer drum subjects milling picks to intense impact shock, high frictional heat, and abrasive asphalt slurry. A high-durability road milling tooth consists of four essential engineered parts:
- Tungsten Carbide Tip: High-purity, micro-grain carbide button engineered to withstand severe asphalt abrasion without mushrooming or fracturing.
- Forged Alloy Steel Body: Heat-treated tool steel designed to resist high-impact shearing while supporting tool rotation inside the holder.
- Heavy-Duty Wear Plate: Protects the steel holder block face from abrasive slurry scouring, extending tool holder lifespan.
- Clamping Sleeve: Retains the pick inside the tool block while allowing smooth, continuous tool rotation for even wear.
Key Performance Factors for Road Milling Picks
- Smooth Tool Rotation: If asphalt dust jams the pick sleeve, stopping rotation, the carbide tip wears flat on one side instantly (flat-spotting) and destroys the tool.
- Brazing Joint Integrity: High-temperature silver-copper brazing secures the carbide tip inside the steel head, preventing tip loss during high-impact concrete milling.
- Balanced Hardness and Toughness: Premium carbide metallurgy balances hardness (88~90.5 HRA)
Reduce Milling Costs with MCT Road Milling Teeth
Minimizing pick consumption per square meter requires road milling teeth engineered for high rotation reliability and long carbide wear life.
At MCT, we manufacture high-performance road milling picks and tool holders fully compatible with Wirtgen, Dynapac, Bomag, and Caterpillar cold planers. Explore our complete range on our Road Milling Teeth Product Page or reach out to our team today to request sample testing and factory pricing!
