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The Versatility Of Tungsten Carbide Machine Knife Will Become Stronger And Stronger
- Jul 29, 2018 -

Material is the material basis for human development and one of the main manifestations of social progress. A composite material made of a hard phase of a refractory metal and a binder metal through a powder metallurgy process. It is widely used in modern manufacturing industries for its excellent performance, and is called "industrial teeth". , originated in the 19th century and 20s. And its now widely used in machine knife.


With the globalization of the economy and the advancement of science and technology, the use of cemented carbide products is becoming more and more demanding. The technology development of the cemented carbide industry is also very rapid, especially for cemented carbide tool carbide inserts.


The latest cemented carbide machine clamping tool uses a hybrid high-cobalt (13%) ultra-fine grain size matrix with a hard phase grain of 0.2+0.5+0.8μm, which makes the strength and hardness of the tool base material Significantly improved, with the geometry and clamping of the collet blade close to the strength of the integral bit and the unique drill tip design and high performance titanium nitride and titanium aluminide nanophysical coatings, showing excellent Cutting performance.


An ultra-fine grain gradient cemented carbide substrate is used with a medium temperature chemical coating of titanium oxynitride and a fine-grained columnar a-Al2O3 chemical coating. The surface is treated with a post-treatment process that eliminates surface stress, ie, by shot peening. The tensile stress surface of the CVD coating on the rake face reduces the tensile stress of the exposed surface of Al2O3 by 40% and the stress of the inner coating by 20%, which significantly improves the micro-cracking resistance and peeling resistance of the blade. Blade integrity and reliability also improve the surface finish of the coating and reduce the bond between the insert and the chip.


The addition of a small amount of elements to the cemented carbide strengthens the hard and binder phases of the material, purifies the grain boundaries and significantly increases the flexural strength and impact toughness of the material. Ultrafine grained cemented carbide and nanostructured coatings have become mainstream trends. At present, the cemented carbide tool technology is developing in two opposite directions. On the one hand, the general-purpose materials are more and more applicable and more versatile. On the other hand, special-purpose materials are more and more targeted, and are more suitable for the materials to be processed and cutting conditions, thereby achieving the purpose of improving cutting efficiency.