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Analysis of fracture formation of shearing machine blades
- Jul 23, 2018 -

In the fracture formation analysis of the shearing machine blade, the conclusion reached has a very large relationship with the heat treatment process. At the same time as the fracture scanning observation, the fracture surface is treated with different heat treatment processes to analyze the relationship between the mechanical properties of the cutter and obtain The following conclusions show that as the quenching temperature increases, the toughness of the steel material tends to decrease, so the fracture toughness and impact toughness of the shearing machine blade are reduced, and many poor quality steels, so some fine cracks appear, making the tool surface The increase in the degree of unevenness increases the possibility of edge cracking. As the hardness HRC increases, the quenching temperature increases, and the toughness of the steel decreases much, so the possibility of fracture is greatly increased.

 

Due to the processing state of the blade of the shearing machine, the tool needs to bear a large shearing force. This requires the selection of steel, paying special attention to the study of notch sensitivity, and it is necessary to use steel with excellent impact resistance. The heat treatment hardness can cut a variety of metal and other materials for a long time. Experiments show that the fracture toughness of 9CrSi steel is large, generally used for thin metal sheet shearing, while 6CrW2Si steel has good toughness and can be applied to the shearing of various medium and heavy plates, if the hardness of quenching is just right. It can increase the shear life by up to 30%.

 

Due to the high temperature of the heat treatment, the fracture toughness of the blade of the machine is easily reduced, but the wear resistance of the tool with low hardness is not guaranteed. Therefore, nowadays, high-quality materials can obtain higher hardness, and the tool has good toughness, and can obtain relatively good wear resistance in processing ever-changing sheet sizes. At the same time, the company adopts the low-temperature quenching process, which is beneficial to improve the ability of materials to resist stress concentration and reduce the probability of tool collapse. This makes the tool have higher product qualification rate and reduce the incidence of returns.