Interference joint is often encountered in mechanical assembly, which is a fixed connection that can not be disassembled. Due to the interference between the contained parts and the contained parts, the traditional pressure matching method mainly includes hammering, tool pressing, press pressing, etc. However, when the fit interference is large, the fit diameter is large, the fit length is long, or the shape of the fit part is complex, and the length exceeds the working range of the press, and so on, the use of pressure fit is often difficult to work. In case of interference fit in single piece or small batch production, the pressing of manufacturing tools can meet the technical requirements, but it has high cost, long cycle and is uneconomical.
The cold shrink assembly of industrial refrigerator is applicable to the assembly of interference fit parts which can be frozen for the contained parts (such as pin shaft, elastic support shaft) which can not be heated or the parts will change the accuracy, material structure and affect their mechanical properties. The cold shrink assembly of industrial refrigerator is suitable for all kinds of hot working dies, cold working dies, gears and shafts of all kinds of gearboxes, precision mechanical parts, motor stators, rotors, auto parts and engine parts.
The cold assembly method of industrial refrigerator is applicable to the assembly of interference fit parts which can be frozen by the contained parts (such as pin shaft, elastic support shaft) if the contained parts (such as planetary frame, torsion arm, etc.) cannot be heated or the heated parts will lead to the change of parts accuracy, material structure and affect their mechanical properties.
When the hole parts are large or irregular in shape, and the pressed parts are small, and it is difficult to use the method of heating the hole parts, cold fitting can be used.
The specific method is to use industrial refrigerator to cool the contained parts at low temperature, reduce their size, and then install them into the parts with holes.
In the process of hot assembly, the base hole parts need to be heated and heated, then cooled in the air. This process is equivalent to a low-temperature annealing treatment of the parts, which reduces the hardness and strength of the parts. The cold assembly of industrial refrigerators is equivalent to one-time cold treatment of parts. After cold treatment of parts, the following advantages can be obtained:
a. The reduction of austenite can make the product permanent;
b. Hardness increase and its average;
c. Improve the performance of machinery;
d. Size stabilization;
e. Increase magnetism;
f. Increased wear resistance.
Thus, the efficiency is improved and the labor intensity of workers is reduced.