Forged Magnesium Wheels Wheel Forging
Forged Magnesium Wheels Wheel forging
Wheel forging work when the wheel tread, the rim of the side and the track on both sides of the rolling contact, to withstand greater contact stress and serious wear and tear, therefore, wear the main form of wheel forgings failure. Under the action of strong contact stress, the hardened layer and the matrix transition zone are deformed from the surface at 20-25mm to form cracks and extend to the surface to cause fatigue. Coupled with the wheel forging operation, the inner edge of the rim and the two sides of the track contact to produce sliding wear and tear, the reason is the crane and the wheel and track their own dimensional accuracy, structure and other causes of common problems. Factors affecting the service life of the wheel forgings are determined by the load of the wheel body, the wheel structure, the machining accuracy, the wheel material and the heat treatment quality. Forging wheel processing as an important part of the crane equipment, its wear resistance is directly related to the normal operation of the equipment. Heat treatment can improve the tread hardness of the wheel and the depth of the hardened layer. Driving wheel body material mainly use 60Mn, 65Mn, 42CrMo, etc., with forging forming. Wheel forging deformation process is the preparation of the most important part of the free forging process. To consider the technical level and experience of the operator, equipment conditions, tool support, raw material supply, production and management level and other factors.
In general, the wheel forging deformation process selection, according to the shape of the forging, size and technical requirements, combined with the deformation of the forging process characteristics, with reference to the specific process specific to determine.
Wheel forging deformation process includes: to determine the necessary forging forming the basic processes, auxiliary processes and finishing process, determine the order of the process, design process size.
Hollow type wheel forging deformation process includes: to determine the necessary forging forming the basic processes, auxiliary processes and finishing process, determine the order of the process, design process size. Wheel forging deformation process, generally need to upsetting, punching. Some slightly trim can be achieved forging size, and some need to expand the hole inside the hole, and some need to pull the mandrel to increase its length, the specific process program depends on the geometric size of forgings. The forging process is selected according to the specific dimensions of the forging. It must be noted that the hollow type of wheel forging process program selection of the line, are in a certain production conditions under the experience of the summary, with limitations, should be used when the analysis.
Process size design and process selection are carried out at the same time, in determining the size of the process should pay attention to the following points:
1. The shape and size of each process must conform to the deformation rules of each process. For example, when the upsetting blank diameter ratio should be less than 2.5-3 and so on.
2. It is necessary to estimate the change in the size of the blank when the process is deformed. Such as punching the height of the blank is reduced, the height of the blank when the hole has increased and so on.
3. Length direction size requires accurate long shaft forgings, in the design process size, to consider the length of the length of a slight increase.
4. In the indentation, pressure shoulder, wrong shifting, punching and other processes in the blank material produced shrinkage phenomenon, should be added to the appropriate repair and maintenance.