The repair of bimetal band saw blades involves various techniques that, when combined, enhance durability and performance:
1.Sandblasting
Sandblasting uses high-pressure airflow to spray abrasive particles onto the blade surface, refining its morphology and mechanical properties. Low-pressure sandblasting optimizes tooth-tip shape, minimizes chipping, and increases residual compressive stress, leading to a more uniform surface and improved fatigue resistance.
2.Heat Treatment
Heat treatment, including quenching and tempering, enhances hardness and toughness. Quenching forms twin martensite, which may produce brittle carbides, while tempering transforms it into tougher carbides, improving fatigue resistance. Cryogenic treatment further enhances cutting performance by altering the material's microstructure.
3.Precision Resistance Welding
This method welds high-hardness alloy particles onto saw teeth, followed by heat treatment to increase wear resistance and longevity. It offers high efficiency and avoids defects common in traditional welding techniques.
4.Oxynitriding Surface Strengthening
Oxynitriding creates a hard oxide-nitride coating that significantly improves wear and fatigue resistance. For instance, processing at 550℃ for three hours greatly enhances hardness and durability.
5.Tooth Shape Optimization and Simulation
Optimizing tooth parameters-such as rake angle, back angle, and offset-reduces cutting forces, minimizing wear and breakage risks while improving cutting efficiency.
6.Laser Welding and Diffusion Welding
These advanced welding techniques produce high-quality joints, reducing defects and enhancing blade performance.
7.Induction Heating and Homogenization
Induction heating rapidly and evenly heats the blade, refining its internal structure. Research shows it significantly boosts fatigue life and wear resistance.
Conclusion：Selecting the appropriate processes based on specific requirements can effectively extend blade service life and optimize cutting performance.
