Coupler Pressing Machine Quality Requirements Are Important
The assembly of the Coupler Pressing Machine on the shaft is one of the keys to the Coupler Pressing Machine installation. 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, dynamic pressure 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. Since the static press method is limited by the pressure machine, it is difficult to apply a large force when the interference is large. 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 hub of the end of the pad into the wood or other soft materials for the buffer, relying on the impact of hand hammer, the Coupler Pressing Machine into the Coupler Pressing Machine. This method of cast iron, quenched steel, cast alloys and other brittle materials made of the local contact with the risk of injury, should not be used. This method will also damage the surface with the complex, it is often used for low-speed and small Coupler Pressing Machine assembly.
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 is mostly used heating method, the cooling method used less. There are a variety of heating methods, 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, usually below 200 degrees. The heating temperature of the Coupler Pressing Machine can not be increased arbitrarily, and the recrystallization temperature of the steel is 430 degrees. If the temperature of the Coupler Pressing Machine is higher than 200 degrees, the heating temperature of the Coupler Pressing Machine can not be increased from the angle of metallographic and heat treatment. Temperature of more than 430 degrees, will cause changes in the internal organization 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.
Check after assembly: After the Coupler Pressing Machine is completed on the shaft, the vertical and coaxial degrees of the Coupler Pressing Machine and shaft should be carefully checked. Usually in the Coupler Pressing Machine of the end and the outer circle set up two dial indicator, turning the shaft when the rotation, observe the Coupler Pressing Machine of the whole beating (including the end of beating and radial run) values, determine the Coupler Pressing Machine and the shaft Of the degree of verticality and coaxiality of the situation. Different speed, different forms of Coupler Pressing Machine on the requirements of the whole beating different, the Coupler Pressing Machine in the shaft after the completion of the assembly, the Coupler Pressing Machine must be the total beating deviation in the design requirements within the tolerance range, which is the Coupler Pressing Machine One of the main quality requirements of the assembly. There are many reasons why the full jitter value of the Coupler Pressing Machine does not meet the requirements, first of all may be due to processing errors. For the field assembly, due to improper assembly of the key caused by the Coupler Pressing Machine shaft and shaft different axis. The correct installation of the key should be the key side of the key and the keyway wall close fit, usually in the assembly with color inspection, with a bad file or blade repair to meet the requirements.