Hardness of the cutting edge is recommended

How to choose the hardness of the cutting edge? This is the concern of many people when buying knives. Hardness is one of the main performance indicators of the tool, it will affect the sharpness of the cutting edge, durability and vulnerability, so the choice of suitable hardness for improving the service life and efficiency of the tool is of great help. In this article, we will give you advice on choosing the hardness of the cutting edge.

First, we need to understand what hardness is. Hardness refers to an object's ability to resist deformation or cutting. In knives, hardness is usually measured using either Rockwell hardness (HRc) or Vickers hardness (HV). The higher the hardness, the better the wear resistance and damage resistance of the tool; However, the hardness is also easy to lead to material embrittlement and fragile, thus affecting the use of the tool effect.

Different application scenarios require different hardness. Generally speaking, low hardness tool is easier to wear, so it is suitable for processing soft, easy to cut materials. For example, the daily use of tools with low hardness of stainless steel (such as SUS420J2), then our kitchen tools are mostly made of stainless steel low hardness material; The turning tool in metal spinning processing needs to withstand strong cutting force, so it needs higher hardness of steel (such as SKD11) to ensure cutting quality and service life.

Another thing to notice is the Angle and inclination of the blade. In the case of a common single-blade arc knife, the slope and Angle are the dip and the knife Angle of the arc. Angle, also known as cycloidal Angle, refers to the Angle between the blade and the axis of rotation; Knife Angle refers to the Angle between the blade and the workpiece and the tangent line. The larger the knife Angle, the sharper the blade, but the blade is easy to damage; The smaller the dip Angle, the greater the feeding force on the workpiece, but the greater the centrifugal force.

In addition, considering different processing needs, different hardness will also choose different materials. At present, the most commonly used blade materials are carbon steel, stainless steel, high speed steel, hard alloy and ceramics. The hardness and mechanical properties of these materials have their own advantages and disadvantages, and should be analyzed and compared according to the processing materials, technology and other factors, so as to choose the best suitable process scheme.