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The main reason for carbide CNC insert blade wear

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Update time : 2018-09-26 15:39:48

Wear of CNC inserts, abrasive wear on cutting chips or some tiny hard spots on the surface of the workpiece (such as carbides, oxides, etc.) and impurities (such as sand, oxide, etc.), as well as adhering built-up fragments, etc. The surface is characterized by a mechanical wear caused by the grooved surface. For high speed steel tools that require low speed and low cutting temperature (such as broaches, dies, taps, etc.), they are the main cause of wear.

The bond wear forms a fresh surface contact under the action of the positive pressure and the cutting temperature between the flank face of the CNC blade and the surface of the workpiece and the rake face of the CNC blade and the chip. When the contact surface reaches the interatomic distance, adsorption bonding occurs. The station nodes are gradually sheared, torn away by the workpiece or chips, and the surface of the CNC blade is bonded and worn. Bond wear is one of the main causes of wear of cemented carbides when cutting at moderately low cutting speeds.
Diffusion wear at high temperature and high pressure, some chemical elements in the numerical control blade material and the workpiece material diffuse in the solid small, that is, Ti, w, Co and other elements in the hard alloy are diffused in the steel, and Fe, C in the workpiece The diffusion of the elements into the numerical control blade causes the hardness, strength, and brittleness of the blade surface to increase, and the tool wear is intensified. This is diffusion wear, which is one of the main causes of wear and tear in the early high temperature (800"900 °C) of cemented carbide tools.

Generally, the diffusion speed of W and Co is faster than that of Ti and Ta, so the high-temperature cutting performance of YT-based cemented carbide is better than that of YG. When the phase change wear is cut with a high speed steel tool, when the cutting temperature exceeds its phase transition temperature (550"600 °C), the metallurgical structure of the CNC insert will change, causing the hardness to decrease and the wear to be accelerated, so the phase change wear is One of the main reasons for the wear of high-speed steel CNC inserts. Chemical wear At certain temperatures, the medium around the cutting zone, such as air, cutting fluid, etc., chemically reacts with the tool material to form loose and fragile compounds. These compounds are easily cut and The workpiece scratches away and causes the CNC blade to wear out.