Analysis of defects in the products of forging manufacturers
No matter what kind of products are produced, it is inevitable that some defective products will appear, and the products of forging manufacturers are no exception, while the products of forging manufacturers are prone to some defects, such as oxidation, decarburisation, overheating, overburning, cracking, etc.. Next we will analyze, one by one, the causes of these defects and ways to improve them.
During the heating process, the products of forging manufacturers react with oxidizing gases in the brain to generate oxides, called oxidation reactions. The appearance of metal blank oxide will not only damage the metal, but also reduce the surface quality and dimensional accuracy of the forging manufacturer's products. However, when pressed into the forging mechanical depth of the oxide skin exceeds the processing margin, and even scrap forging manufacturers' products. In the heating process, the forging manufacturer product surface carbon and oxygen and other media chemical reaction, resulting in a reduction in the surface oxygen content, known as decarburization.
Decarburization will reduce the surface hardness and wear resistance of the forging factory added products. If the decarburisation thickness is less than the mechanical addition, it will not be harmful to the forging manufacturer, otherwise it will affect its quality. This can be mitigated by applying a protective coating to the surface of the ingredients and heating them quickly, in a reducing or neutral medium. A forging manufacturer is said to be overheating if the product is heated at too high a temperature or kept at a high temperature for too long, resulting in coarse grain size. The appearance of overheating will reduce the plasticity and mechanical properties of the forgings. At this point, the manufacturer needs to strictly control the temperature of the forging in the heating process and shorten the holding time at high temperatures as much as possible to prevent this phenomenon.
Forging manufacturers if the heating temperature of the product exceeds the initial forging temperature, the grain boundaries will melt or oxidize, known as over-wounding. If the over injury occurs, the strength of the forging material will be seriously reduced, resulting in poor product plasticity, once the forging becomes a scrap. There is no way to save, to operate correctly. In the heating process of certain large forging manufacturer products, if the furnace temperature is too high or heating speed is too fast, the temperature difference between the internal temperature and the surface temperature will be too large, resulting in excessive internal stress and cracking of the product. Therefore, in the heating process of large forgings, it is necessary to prevent the temperature from being too high or the heating speed from being too fast, so forging manufacturers are generally required to take certain measures to prevent heat.
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