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How To Identify The Hardness And Wear Resistance Of The Toothed Blade
- Aug 03, 2018 -

Toothed blades are professional mechanical knives for pencil sharpening. Most of the mechanical parts are made of carbon and alloy structural steel. When turning such materials, more strip-shaped chips are formed.


High hardness and wear resistance

Hardness is the basic property that a toothed insert material should have. The toothed blade has to cut the chip from the workpiece and its hardness must be greater than the hardness of the workpiece material. The chip edge hardness of the toothed blade used for chip metal is generally above 60 hrc. Abrasion resistance is the ability of a material to resist wear. In general, the hardness of the toothed blade material is higher. The better the wear resistance. The harder the hardness of the hard spots in the tissue, the larger the number, the smaller the particles, and the more uniform the distribution, the better the wear resistance. Abrasion resistance is also related to the chemical composition, strength, microstructure and temperature of the friction zone. The formula can be used to indicate the wear resistance of the material wr; we=kico.5e-0.8h1.43 In the formula, the higher the hardness, the better the wear resistance.


Sufficient strength and toughness

The mechanical blade material must have sufficient strength and toughness to withstand the high pressure of the toothed insert and the shock and vibration conditions that often occur during the cutting process without causing chipping and breaking.


High heat resistance

Heat resistance is a major indicator of the cutting performance of toothed insert materials. It refers to the performance of the toothed insert material to maintain the agreed hardness, wear resistance, strength and toughness under high temperature conditions. The toothed blade material should also have the ability to resist oxidation at high temperatures and good anti-adhesive and anti-diffusion properties, that is, the material should have good chemical stability.


Good thermal physical properties and thermal shock resistance

The better the thermal conductivity of the toothed blade material, the easier it is to remove the heat from the cutting zone, which helps to reduce the cutting temperature.