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Based on ordinary bimetallic band saw blades, bimetallic coated band saw blades achieve a comprehensive performance leap through PVD hard coatings (such as TiN, TiCN, AlTiN, etc.). The core advantages are doubled lifespan, higher efficiency, stronger heat resistance and wear resistance, smooth chip removal, and lower overall cost.
1. Core performance comparison (coating vs. ordinary)
1. Wear resistance and lifespan: Significantly doubled
Ordinary bimetal (M42 uncoated): The hardness of the tooth tip is approximately HRC65–67, which wears quickly, with a lifespan of about 3–5 days (under conventional load).
Coated bimetal: The surface hardness reaches HV2000–4500 (typically only around HV940), with wear resistance improved by 2–4 times, overall lifespan extended by 50%–100%, and in some working conditions, it can be doubled.
Actual measurement: When cutting mold steel/stainless steel, the single sharpening processing capacity of the coated saw blade is increased by 200%, and the tool change frequency is significantly reduced.
2. Heat resistance and red hardness: not soft at high temperatures
Ordinary bimetal: The temperature of the high-speed cutting tooth tip can reach 400–500℃, leading to a rapid decrease in hardness and susceptibility to annealing wear.
Coated bimetal: The coating provides thermal insulation and can withstand instantaneous high temperatures of 600–650°C. It exhibits stronger red hardness and maintains high hardness at high temperatures, making it suitable for high-speed/heavy-duty cutting.
3. Friction and chip removal: Lower resistance and smoother operation
Common bimetal: high friction coefficient (≈0.8), easy chip adhesion, poor chip evacuation, easy chip jamming, and tooth breakage.
Coated bimetal: The coating has a low friction coefficient (≈0.3–0.5), reducing friction and preventing sticking, with chip removal efficiency improved by 30%+; it provides smoother cutting and better surface quality.
4. Cutting efficiency: speed increased by 10%–30%
Ordinary bimetal: Limited by heat generation and wear, the cutting speed is relatively low (e.g., about 80mm/min for die steel).
Coated bimetal: With good heat dissipation and low resistance, it can increase the linear speed and feed rate, resulting in a 10%–30% efficiency improvement, while reducing the risk of tooth tip damage.
5. Impact resistance and stability: not prone to chipping or breaking
Ordinary bimetal: hard and brittle, prone to micro-chipping under impact, with limited fatigue life.
Coated bimetal: The coating enhances toughness, improves impact resistance and fatigue resistance, and reduces tooth breakage and fracture, making it particularly suitable for cutting difficult materials and intermittent cutting.
6. Scope of application: More suitable for high-hardness/difficult-to-cut materials
Ordinary bimetal: suitable for ordinary carbon steel and low alloy steel, but it wears quickly and has low efficiency when cutting stainless steel, mold steel, and high-temperature alloys.
Coated bimetal: Versatile for both soft and hard materials, particularly suitable for high-hardness/difficult-to-cut materials such as stainless steel, mold steel, tool steel, bearing steel, titanium alloy, and high-temperature alloy.