时间：2013-08-01 18:21　作者：admin　点击： 次

    The coupling is heated to expand by heating or the end of the shaft is cold and contracted by cooling, so that the wheel coupling can be easily installed on the shaft.This method has more advantages than static press-in method and dynamic press-in method. For wheels made of brittle materials, the temperature difference assembly method is very suitable.The temperature difference assembly method mostly uses the heating method, and the cooling method is relatively small.There are many heating methods. Some put the wheel hub in high flash point oil for oil bath heating or welding torch baking, and some use an oven to heat it. The assembly site uses oil bath heating and welding torch baking.The maximum temperature that the oil bath can reach depends on the nature of the oil, and it is generally below 200°C.When other methods are used to heat the hub, the temperature of the coupling can be higher than 200°C, but from the perspective of metallography and heat treatment, the heating temperature of the coupling cannot be increased arbitrarily, and the recrystallization temperature of steel is 430°C.If the heating temperature exceeds 430°C, it will cause changes in the internal structure of the steel. Therefore, the upper limit of the heating temperature must be less than 430°C.For insurance, the upper limit of heating temperature should be below 400℃.As for the actual heating temperature of the coupling, it can be calculated according to the interference value of the coupling and the shaft and the requirements when the coupling is heated on the shaft.