Time：2023.02.22Browse：1
There are two methods for burning the graphite molds for the destruction of graphite molds: resistance wire heating method and high -frequency electromagnetic sensing heating method. We know that when the resistance wire heating method is burned, the outer mold temperature is low, and the blade and core mold temperature is higher. The temperature is unevenly decided to decide the part where the mold is destroyed.
1. Surface air oxidation and cracks: Because there is no recovery atmosphere during the entire process of burn, the graphite and gas are directly contacted, and it is difficult to avoid the surface air oxidation at high temperature. The higher the temperature, the faster the air oxidation rate; The mold is slowly consumed, leaving only a part of carbon and gray, and stones can be found on the spot on the spot. After a period of time, the surface of the mold will cause porosity and charcoal.
2. Fracture: The reason for this kind of destruction is that the gear board of the golden steel blade was not firmly clamped, causing unbalanced loss on the top of the head, causing the horizontal shear stress.
3, crushing: Graphite mold immediately touches with base materials with gold and steel. The surface is under pressure. The strength of gold steel and graphite mold is very different. The surface of the mold touched with diamond tool head will cause dentation.
4. Types of knocking down: During the whole process of burning, substrate powder penetrates into the air oxidation gaps of graphite molds in the melting state, causing the adhesion of the special tool head and the middle of the mold to make the mold difficult. The repeated teeth of the mold will make the mold out, which will cause the broken edge of the mold and the dentation of the metal material.
5. The damage specifications of graphite molds are very poor: some substrate powder will squeeze into the surface of the mold under the melting state to adhere to the graphite material. Before applying the mold next time, it is necessary to remove the residual objects of metal materials, which causes the mold and size to go to the tolerance of the mold.
2023-04-03In recent years, graphite molds have continued to impact model shell sales markets with their high -quality characteristics, and have become the new darling of the machinery processing industry. The manufacturers of Kobwee Grapeite products below told everyone that the shortcomings and preventive methods of the heat treatment process of graphite mold.
1. The creep of scales graphite increases with the increase of temperature and stress time. It takes a long time at a lower temperature to observe the obvious creep, but at a higher temperature, the creep can be almost linear increased, that is, the peristalsis at a lower temperature increases only several times, and the temperature rises at a few times at a few times. The intervals when Baidu increased the index.2. The creep of scales graphite is also proportional to the exerted stress. In the same temperature and the same time, the greater the stress applied, the greater the creep.3. The creep of scales graphite is also related to the final heat treatment temperature of graphite. The higher the thermal treatment temperature, the smaller the scales of graphite.For the analysis of micro -quality impurities in scales graphite, the sample is usually pre -grayed or wet to digest carbon removal, dissolved ash with acid, and then determined the impurities in the solution. The measurement m2023-07-25What factors are influenced and gray -testing of scales graphite creep
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