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Graphite Die Technology For Graphite Die
Aug 09, 2017

Graphite Die technology for Graphite Die
Graphite Die surface treatment technology, through the surface coating, surface modification or composite processing technology to change the Graphite Die surface morphology, chemical composition, structure and stress state, in order to obtain the required surface performance of the system engineering. At present in the Graphite Die manufacturing more applications are mainly nitriding, carburizing and hardening film deposition.
As the nitriding technology can form a good performance of the surface, and nitriding process and Graphite Die quenching process has a good coordination, while nitriding temperature is low, nitriding without intense cooling, Graphite Die deformation is minimal, so Graphite Die surface strengthening is the use of nitriding technology earlier, but also the most widely used.
Mold graphite carburizing is to improve the overall strength of the Graphite Die, that is, Graphite Die working surface with high strength and wear resistance. Under the current technical conditions, the cost of hardening film deposition (mainly equipment) is high, still only in some precision, long life Graphite Die application, if the use of the establishment of heat treatment center, the cost of coating hardened film will be greatly Reduce, more Graphite Die if you use this technology, you can improve the overall level of China's Graphite Die manufacturing.
With the improvement of machining machine and cutting tool performance, the development of pre-hardening technology of Graphite Die material has been accelerated. By the 1980s, the proportion of industrial hardening modules on industrial molds has reached 30%.
The traditional mold materials are stainless steel, copper, aluminum, metal alloy, etc., no matter what kind of material mold can not have both high temperature, strong earthquake resistance, easy deformation, good conductive thermal conductivity, oxidation resistance, Defects. So, people continue to find new materials to do the mold, and finally found the graphite, Graphite Die with all the above advantages, as the best material for the production of mold.
Today, the market more and more Graphite Die, a variety of mobile glass Rewriting Graphite Die, electronic sintered Graphite Die, exothermic welding Graphite Die to replace the traditional mold, become the most applications of the mold.
Graphite material has the following six advantages:
(1) high temperature type: graphite melting point of 3850 ± 50 ℃, boiling point of 4250 ℃, even if the ultra-high temperature arc burning, the weight loss is very small, thermal expansion coefficient is also very small. Graphite strength is enhanced with increasing temperature, doubling the strength of graphite at 2000 ° C.
(2) conductive, thermal conductivity: graphite conductivity than the general non-metallic mine one hundred times higher. Thermal conductivity than steel, iron, lead and other metal materials. Thermal conductivity decreases with increasing temperature, even at very high temperatures, graphite into a thermal insulation.
(3) Lubrication: graphite lubrication performance depends on the size of graphite scales, the larger the scale, the smaller the coefficient of friction, the better the lubrication performance.
(4) chemical stability: graphite at room temperature has good chemical stability, acid, alkali and resistance to organic solvents corrosion.
(5) Plasticity: graphite toughness is good, can be crushed into thin slices.
(6) thermal shock resistance: graphite at room temperature when used to withstand the dramatic changes in temperature without damage, the temperature mutation, the graphite volume changes little, no cracks.
The unique advantages of graphite materials make it the best material for manufacturing molds, widely used in the electronics industry, photovoltaic industry, glass industry, nonferrous metals industry and other fields. Commonly used Graphite Die with electronic sintered Graphite Die, mobile glass Rewriting Graphite Die, exothermic welding Graphite Die.