What are the basic requirements for the turning of thermal spray coatings on tool materials?

       In the process of cutting the coating, due to the plastic deformation of the alloy and the severe friction between the cutting edge of the tool, the cutting edge of the tool is subject to great mechanical stress and thermal stress, so that the tool is quickly worn or damaged. Tool materials are generally required to meet the following conditions:



    1) High hardness and high wear resistance

    Hardness is a basic characteristic that tool materials must have. The hardness of the cutting edge of the current tool is above 60HRC~70HRC. Abrasion resistance is the ability of a material to resist wear. In general, the higher the hardness, the better the wear resistance.

    2) Sufficient strength and toughness

    In the process of cutting the coating, the cutting edge of the tool should not only be able to withstand a large amount of compressive stress, tensile stress, and bending stress, but also be required not to chip or break when subjected to shock or vibration.

    3) High heat resistance and thermal stability

    Heat resistance is the main indicator to measure the cutting performance of tool materials, which refers to the performance of tool materials to maintain hardness, wear resistance and toughness at high temperatures. The higher the high temperature hardness of the tool material, the better its cutting performance and the higher the allowable cutting speed. The coating with high surface roughness makes the cutting edge always in a state of intermittent cutting, which requires good thermal stability of the tool material to withstand frequently changing thermal shocks.

    4) Good chemical stability

    Good chemical stability refers to the anti-oxidation ability, anti-adhesion ability and anti-diffusion ability at high temperature.