Mechanical Blades and Their Usage Performance
Mechanical blades are cutting tools for processing raw materials and products in industries such as papermaking, printing, and wood processing. They come in a wide variety of varieties, are widely used, and their usage is increasing. Mechanical blades are thin-blade tools for cutting non-metallic materials. After heat treatment, they must have superior performance. They must have high hardness, toughness, wear resistance and certain hot hardness, as well as high fatigue fracture resistance and carbide peeling resistance. Especially for wood processing rotary cutters and planer cutters, the performance requirements are higher. At present, the blade steel of high-quality rotary cutters and planer cutters at home and abroad is made of special tool steel. According to its composition, it belongs to high-carbon low-alloy steel, medium-alloy steel or high-carbon high-alloy steel with multiple alloys such as Cr, W, Mo, and V. The martensite alloying of blade steel after heat treatment should be high, and the residual carbide after quenching should be extremely uniform and refined to obtain high yield strength, high fracture toughness and corresponding hot hardness, so that the blade has high sharpness, wear resistance and impact resistance during cutting. In order to further improve the performance of rotary cutters and planers and cope with domestic and foreign market competition, blade companies are still continuing to develop and experiment with new blade steel materials.
The performance of mechanical blades includes sharpness, wear resistance, no chipping and curling, and hot hardness, which are related to the strength, hardness, toughness, brittleness, fatigue, fracture, wear resistance, tempering resistance and red hardness of steel, but are not completely equivalent. The sharpness of the blade has a direct correspondence with the hardness, yield strength and carbide refinement of the blade steel, and is also related to the blade angle and blade grinding. The wear resistance of the blade is related to the wear resistance of the matrix and the shedding of carbides on the blade. The appropriate amount of residual carbides and their own hardness are also critical. The blade does not chip or curl because the comprehensive strength, hardness, toughness, brittleness, fatigue, fracture and other comprehensive properties of the blade steel cannot fully meet the requirements of national standards.
