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Normal wear and abnormal wear of cutting tools

Source : Suzhou Sonite Trading Co.,Ltd.    Date : 2019-02-20    Page views : Loading...

  In recent years, industrial productivity has become more and more extensive, and the application to the sub-sector has become more and more extensive. However, in the process of production, there is little understanding of the scope of application, which will cause various problems and affect the production delivery cycle; for example, in ordinary life work, there will be The master of machining will ask, "Why can I use this blade for a little bit of time? I can't use it."

  When the tool is subjected to the friction of the workpiece under high temperature conditions, the tool will be gradually worn and damaged, but how to distinguish between normal wear and abnormal wear?

  Normal abrasion

  Normal wear refers to a form of wear that gradually increases in wear over time, two of which are clearly expressed as normal wear.

  The front wears and the crater wear occurs in the front edge of the blade, which is formed by friction and high temperature and high pressure when the chips flow out.

  After the main wear, the main rear wear is divided into three areas, the blade wear is expected to be in the C zone. The wear loss VC is caused by the low strength and temperature concentration at the near tip, and the intermediate wear B zone, except for the uniform wear amount VB. The large amount of wear at which the wear is severe is VBmax, which is caused by the difference in friction and heat dissipation. The boundary wears the N zone, and the VN is worn at the interface between the cutting edge and the surface to be processed, which is caused by the high temperature oxidation and the surface hardening layer.

  Abnormal wear

  Abnormal wear is usually caused by damage to the tool due to impact, uneven heat, and improper use of the tool. The following are abnormal wear of the tool.

  The chipping occurs with fine chipping on the cutting edge due to the low strength of the cutting edge, the impact and the hard spots in the cutting layer.

  Crushing, cracking at the tip or cutting point, the tool material is brittle, the cutting edge or cutting strength is low, and the cutting load is large, and the middle cut or cut is easy to occur.

  Hot cracking, small cracks appear in the vertical cutting edge, due to uneven cutting temperature, discontinuous cutting, uneven casting of cutting fluid.

  Collapse, under the action of high temperature and high pressure during cutting, the cutting edge loses cloud cutting performance and causes the front or the cutting edge and cutting edge to collapse. This is when the cutting temperature of high speed steel tool exceeds 650 degrees and the cutting temperature of cemented carbide tool exceeds 1000 degrees. The form of damage that occurs.