Coupler Pressing Machine Quality Requirements Are Important
Coupler Pressing Machine assembly, in the mechanical maintenance is a relatively simple maintenance process. In the Coupler Pressing Machine assembly key to master the hub of the assembly on the shaft, the Coupler Pressing Machine of the two-axis alignment, the inspection of parts and drawings according to the requirements of the assembly Coupler Pressing Machine and other links.
After the hub of the Coupler Pressing Machine is assembled on the shaft, the vertical and concentricity of the hub and the shaft should be carefully checked. Usually in the hub of the end and the outer circle set up two dial indicator, turning the wheel when the axis of rotation, observe the hub of the whole beating (including the end of beating and radial run) values, determine the wheel and the vertical axis and coaxial The situation of the situation. Different speed Coupler Pressing Machine of the requirements of the whole beating different values, different types of Coupler Pressing Machine on the requirements of the whole beating is also different, but the wheel assembly on the axis after the hub must be the total beating deviation of the value of Design requirements within the tolerance range, which is one of the main quality requirements of the Coupler Pressing Machine assembly.
Coupler Pressing Machine and shaft with the interference of most of the interference fit, the connection is divided into key and keyless connection, Coupler Pressing Machine shaft hole is divided into cylindrical shaft has also been with the cone-shaped shaft hole in two forms. Assembly methods are static pressure method, power press method, temperature assembly method and hydraulic assembly method.
Static pressure method: This method is based on the size of the required press force when assembling, the use of clamps, jacks, manual or mobile presses, static pressure method is generally used for tapered shaft hole. As the static press method by the pressure of mechanical restrictions, in the larger interference, the application of a lot of force more difficult. At the same time, in the process of pressing will be cut between the Coupler Pressing Machine and the axis of the uneven surface of the uneven crest, so that the mating surface is damaged. Therefore, this method is generally not much application.
Power press method: This method refers to the use of impact tools or machinery to complete the assembly process, generally used for Coupler Pressing Machine between the Coupler Pressing Machine and the shaft is a transition or interference is not the occasion. The assembly site is usually beaten by hand hammer method, the method is in the wheel's end into the wood or other soft material for the buffer, relying on the impact of hand hammer, the Coupler Pressing Machine into the Coupler Pressing Machine. This method of cast iron, hardened steel, cast alloys and other brittle materials made of the Coupler Pressing Machine of the risk of local damage, should not be used. This method also damages the mating surface, so it is often used for assembly of low speed and small Coupler Pressing Machines.
Temperature difference assembly method: the heating method to make the Coupler Pressing Machine heat expansion or cooling method to shrink the shaft end, which can easily put the wheel Coupler Pressing Machine on the shaft. This method than the static press method, power press method has more advantages for the use of brittle materials made of the hub, the use of temperature assembly is very appropriate. Temperature assembly method used mostly heating method, the cooling method used less. There are many ways to heat, and some of the wheels into the high flash point of the oil for oil bath heating or torch baking, and some with the oven to heat the assembly site to use more oil bath heating and torch baking. Oil bath heating can reach the maximum temperature depends on the nature of the oil, generally below 200 degrees. When using other methods to heat the hub, you can make the Coupler Pressing Machine temperature is higher than 200 degrees, but from the perspective of metallographic and heat treatment, the heating temperature of the Coupler Pressing Machine can not be arbitrarily increased, the steel recrystallization temperature of 430 degrees, if heated Temperature of more than 430 degrees, will cause changes in the internal structure of steel, so the upper limit of heating temperature must be less than 430 degrees, for the sake of insurance, the heating temperature limit should be below 400 degrees. As for the actual heating temperature required for the Coupler Pressing Machine, according to the Coupler Pressing Machine with the axis of the interference value and the Coupler Pressing Machine after heating on the shaft set when the requirements of the calculation.