Custom GEBK spherical plain radial bearing Motor Bronze Bushing

slidebushing
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For ring problems during cooling, had to take the following measures.

1. Without changing the cooling mode, and improve the quenching heating temperature of precision linear motion (choose limit temperature), to increase the stability of the supercooled austenite in steel, so as to reduce the critical cooling rate of GCr15 steel.But with the improvement of heating temperature, the steel secondary carbides dissolve too much, cause the austenitic grain size grows larger, and hinder the martensite length greater role is abate,starter motor bronze bushing in oil sintered PM the same ring hardness difference is bigger, the biggest difference between HRC2, quenching and tempering in the organization still occasionally appear local there are a few small block troostite;Also began to have fine acicular martensite appeared at the same time, in 500 times metallographic microscope you can see the obvious acicular martensite (overheating).Quenching deformation has risen sharply, diameter change quantity rate rise by an average of less than 10% to more than 20%, parts mechanical properties relative degradation.

2. With fast cooling speed rapid quenching oil.Due to the limitation of objective conditions, in production, inevitable to enter a small amount of water in the tank, makes gradually emulsified oil in use process, performance changes, lose a good cooling effect,GEBK spherical plain radial bearing and make the quenching quality to reach the ideal effect.

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