Selection of Cylindrical guide bush factory
The guide post and guide sleeve have poor hardenability, large heat treatment deformation, poor wear resistance and low life, and are not suitable for making large, medium and complex molds. However, the production cost of the guide post and guide sleeve is low, it is easy to process hot and cold, the source of raw materials is wide, and it still has considerable hardness after heat treatment. Therefore, Cylindrical guide bush factory recommends that cold punches and scissors with simple shape, small size and light load are still widely used.
Cylindrical guide bush factory In particular, it should be pointed out that the guide bush is the most suitable for cold-shock die, but this point has not received widespread attention. According to the working conditions of the cold emblem mold, in addition to sufficient strength, sufficient hardness and hardened layer on the working surface and cavity of the mold, it also needs to have sufficient toughness. After heat treatment of such molds, it is only required that the inner hole has a certain crushed hard layer (the thickness of which varies according to the mold load) to maintain high toughness.
Cylindrical guide bush factory Among the guide bushes used as molds, T1OA steel is the most commonly used. The main reason is that compared with T8A (eutectoid steel), it has higher wear resistance and less overheating sensitivity, and can obtain higher strength and certain toughness after proper heat treatment. When the eutectoid steel is heated at a lower temperature (780-790°C), the grains of the eutectoid steel are easier to grow than the hypereutectoid steel, because the excess carbides in the hypereutectoid steel hinder the grain growth.
However, Cylindrical guide bush factory cautions that slightly exceeding this temperature (which is very likely to occur under normal production conditions) will also greatly reduce strength and plasticity. In addition, eutectoid steel retains less retained austenite in the quenched state than hypereutectoid steel, and has a larger specific volume, so the quenching stress is relatively large.