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    • Thursday 20 November, 2014 | RSS Feed

    Types of Tool Wear

    Types of Tool Wear

    (Ⅱ)

     

    Last time, we introduced tool wear types.

    Today, let's go on with the types of tool wear.

     

    5. The Fifth types of tool wear –

    Diffusion wear:

    (1)  At higher temperature and pressure, some elements of cutting tools materials (such as tungsten, Co, Ti, etc), will diffuse into work piece materials;

    It will:

    ①      Change chemical composition of cutting surface;

    ②      Reduce diamond tools intensity;

    ③      Lower wear resistance;

    ④      Come into being diffusion wear;

     

    (2)  Diffusion wear is a major reason of tool wear at high temperature cutting;

     

    6. The Sixth types of tool wear –

    Phase-transformation wear;

    (1) As the temperature grows, metallographic structure will change once reach phase transition temperature;

    It results in:

    ①   Lower hardness;

    ②   Reduce abrasion resistance;

    ③   Lose cutting performance;

    ④   Happen phase transition wear;

    (2) Usually, phase transition wear is the main cause that high speed steel cutting tools wear out;

     

    7. The Seventh types of tool wear –

    Heatchecking wear:

    (1)  Every cutter tooth of milling cutter is cutting discontinuously and periodically;

    (2)  From idle running into cutting, there's a wide variation in the temperature;

    It can be said that, milling bits suffer one heat shock into cutting every time;

    (3)  To ball nose cutters, the blade inside will introduce a very high level of stresses and cracks under thermal shock, then cause heatchecking wear;  

     

    8. The Eighth types of tool wear –

    Thermal wear:

    While cutting, the cutting heat caused by metal severe plastic deformations and friction, reduces the hardness of tool blade, then will lose cutting performance and cause wear;

    This tool wear type is called thermal wear;

     

    9. There are also some other types of tool wear, such as: oxidative wear, thermochemistry wear, electrochemical wear, etc.

     

     

    Besides Types of Tool Wear (Ⅱ), you may also interest in:

    (1)    Router Bit Types (Ⅰ);

    (2)    Types of Router Bits (Ⅱ).

     

     

    by astech-cnctools

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