The surface self - lubrication of Castings surface is a technology
Blanking, stretching and other Castingss in the production are in the state of repeated, must improve their wearability to prolong the service life. If the new materials and surface treatment methods are used, there are disadvantages such as high cost, complex process and long production cycle. 823 antiwear agent and Cr12, CrMoV, T10A black metal atoms to form covalent bonds, the binding force of 30 ~ 150 kcal/mole, than the binding force between the molecules (i.e., van der mana) big 11 ~ 300 times, while in the process of stamping suffered strong technology force, it will also no longer cause peeling Castings.
The metal surface coated with 823 anti-wear agents can form a multi-molecular structure of directional arrangement, generally 3 ~ 4 layers, with a thickness of about 20nm. The friction between film and film is formed by friction of 823 anti-wear Castings of multi-molecular structure. It can greatly improve the wearability and effect of cutting, stretching, bending and die Castings.
In the process of stamping, due to the strong friction force, it is necessary to add high strength special lubricating oil to reduce friction coefficient to reduce friction so as to improve workpiece quality and prolong Castings life. At present there are many ways to improve the hardness on the surface of the Castingss, such as surface hardening, hard chromium plating, nitriding treatment, etc., but these methods are a common shortcomings, namely can only improve Castings surface hardness, but can't reduce the skin friction coefficient and reduce the friction.
When the surface of the Castings is coated with 823 anti-wear agents, a complete protective film is formed on its surface, which is arranged by the polar molecules of numerous anti-wear agents. Castings the relative movement of two metal antiwear agent 823 is actually a riveting in 823 protectant polar molecules on the surface of the metal table tail and tail, the friction between good self-lubricating properties, anti-seizure (bonded), can reduce the coefficient of friction between workpiece and Castings 5 ~ 10 times and reduce friction over a third.
Good toughness and high manganese steel Castings technology is good, price is low, its main characteristic is in larger shocks or under the action of contact stress, surface layer will quickly produce strain hardening, the strain hardening index of 5 to 7 times higher than the other materials, the improvement of wear resistance improved. But high manganese steel Castingss for crusher performance demand is higher, if the physical impact is not enough in the practical work or contact stress is small, can't make work hardening surface rapidly, so as to play its wear resistance. Therefore, the equipment should be selected according to the actual parameters of the equipment before use, and the equipment can be reformed when necessary, so that it can be used for economic benefit.
High manganese steel has a good plasticity and impact toughness. When the surface layer of hardened surface is hardened by external force impact, the hardened surface layer has been worn down, and the new surface layer appears, and it continues to be processed and hardened. Therefore, the high manganese steel Castingss have high surface abrasion resistance, and the parts still retain the original mechanical properties. Since high manganese steel has the above characteristics, so far, there is no wear resistant material in the world can replace the high manganese steel completely. The high hardness martensite of high chromium cast iron is strongly supported by carbide particles, which prevent the loss of carbide from the surface and ensure the high abrasion resistance of the material.