Impact-Resistant Tungsten Carbide Milling Bits for Wirtgen Asphalt Machinery

Overview

Engineered for high-performance asphalt milling, the Impact-Resistant Tungsten Carbide Milling Bits are precision-engineered to withstand the harsh conditions of road rehabilitation and pavement maintenance. Designed exclusively for Wirtgen asphalt milling machines (compatible with models W 2000, W 2100, W 2200, and W 2500), these bits integrate a micrograin tungsten carbide (WC) cutting tip with a shock-absorbing 42CrMo4 steel shank, delivering superior resistance to impact loads and abrasive wear. Capable of processing asphalt layers up to 200mm thick and concrete overlays with rebar embedments, they ensure minimal downtime in high-frequency milling operations while maintaining a milling depth accuracy of ±1.5mm.

Features

Advanced Material Engineering:

Micrograin Carbide Tip: Manufactured from a WC-Co alloy with 12% cobalt binder and 3μm grain size (ASTM B317 Grade III), achieving a hardness of 90.5HRA and 30% higher fracture toughness than conventional carbide. This composition resists micro-chipping when encountering steel reinforcements or hard aggregate in asphalt mixes.

Optimized Steel Shank: Heat-treated to 48-52HRC, the shank features a stress-relief groove design that reduces peak stress by 40% during sudden impacts (e.g., hitting bridge deck rebar), validated through finite element analysis (FEA) simulations of 10,000+ impact cycles.

Geometry Optimization:

Dual-Cutting Edge Design: 15° positive rake angle combined with a 25° flank angle creates a self-sharpening effect, improving chip evacuation by 35% in SMA (stone matrix asphalt) milling. The dual edges allow rotating the bit 180° for extended use when one edge is worn.

Precision Threading System: ISO M16x1.5 threads with a surface roughness of Ra≤0.8μm ensure a vibration-free connection to Wirtgen tool holders, tested to maintain concentricity within 0.03mm at rotational speeds up to 2,400 RPM.

Surface Enhancement Technologies:

Ion Nitrided Shank: A 50μm-thick iron nitride layer (HV 900) on the shank provides saltwater resistance (ASTM B117 500-hour test) and reduces adhesive wear in wet milling environments, extending service life by 25% compared to uncoated alternatives.

Laser-Clad Tip Reinforcement: Cobalt-rich alloy (15% Co) is deposited via laser cladding on the carbide tip's impact zone, enhancing resistance to micro-fractures in abrasive conditions—ideal for milling Portland cement-treated base (PCTB) materials.

Application

Highway Rehabilitation Projects:

Efficiently removes aged asphalt layers with up to 25% recycled asphalt pavement (RAP) content, maintaining a consistent milling rate of 150m²/hour on W 2200 machines.

Used in bridge deck milling to remove 50mm-thick concrete overlays without bit breakage, thanks to the shock-absorbing shank design that mitigates impacts from embedded rebar (spacing ≥150mm).

Granular Subbase Processing:

Milling lime-stabilized soil (unconfined compressive strength ≤3MPa) and gravel subbases with a feed rate of 8m/min, where the dual-edge design reduces power consumption by 20% compared to single-edge bits.

Cold Recycling & Surface Profiling:

Compatible with Wirtgen cold recyclers for in-situ recycling of RAP with up to 40% coarse aggregate, ensuring uniform particle size distribution (passing 4.75mm sieve ≥90%).

Why Choose Us

OEM-Compatible Calibration: Factory-tuned for Wirtgen machine parameters (blade speed: 1,800-2,200 RPM; milling depth: 10-150mm), achieving a 15% higher material removal rate than generic bits in side-by-side testing by the Texas Department of Transportation.

Performance Assurance: Backed by a 500-hour wear warranty (measured at 0.5mm tip wear per 100 hours in standard asphalt), with free tool life analysis using your machine's operational data to optimize replacement intervals.

Engineering Partnership: Dedicated support team provides on-site installation training and vibration analysis to ensure proper tool holder alignment, reducing premature wear caused by machine misadjustment.

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