The manufacturing technology of the guide wheel is complex, and it takes many processes to get the finished product. Among them, the technical ability and finish quality of forging, heat treatment, turning and grinding directly affect the life and use effect of the guide wheel, so the material of the guide wheel blank can largely determine its service life. Although the proportion of the raw material factor in the current analysis of idler failure has been greatly improved, it is still the main cause of its failure. In recent years, its production process has also been greatly improved with the substantial improvement of metallurgical technology and the emergence of bearing steel and other materials.
After the guide wheel is installed, a run check is required to check whether it is installed correctly. Small machines can be turned by hand to check whether the rotation is smooth. The inspection items include poor operation caused by foreign body indentation, poor installation, unstable torque caused by poor processing of the mounting seat, too small clearance, installation error, and excessive torque caused by sealing friction.
Due to the large internal stress of the guide wheel workpiece during heat treatment and quenching, we need to formulate a reasonable quenching and quenching temperature according to the actual composition of the forgings, and store and maintain the product during quenching and quenching to further reduce thermal stress. Rough machining before heat treatment When the heat treatment is fully prepared for each stage, the machining allowance, especially the inner hole machining allowance, can ensure that the product can be finished after heat treatment. Grind all the angles of the forging into obtuse angles, including the angles of the inner and outer walls of the hanging holes, to reduce the water cooling time. The possibility of quenching, reduce the oil temperature of the oil tank, prevent the oil temperature from being too high, and the workpiece will catch fire; immediately enter the furnace and turn off the fire after quenching to prevent cracks caused by the low final cooling temperature.
From the actual chemical composition, it can be seen that the carbon content of the bottom of the idler forging and the riser is segregated. In order to solve the influence of composition segregation, corresponding measures should be taken during quenching to ensure that the difference in tensile strength at both ends, the mechanical properties and the size of forgings meet the technical requirements.
Post time: Apr-09-2022
