Wheel hub, also known as wheel rim, is a barrel shaped part whose center is mounted on the shaft and whose inner contour is used to support the tire.Common automobile hubs are steel hubs and aluminum alloy hubs.The steel hub has high strength and is often used for large trucks;However, steel wheels are heavy in quality and single in shape, which does not conform to the concept of low carbon and fashion, and are gradually being replaced by aluminum alloy wheels.
(1) Compared with steel car hubs, aluminum alloy hubs have obvious advantages:densitySmall, about 1/3 of steel, which means that aluminum alloy wheels with the same volume will be 2/3 lighter than steel wheels.Statistics show that the vehicle mass can be reduced by 10% and the fuel efficiency can be improved by 6%~8%. Therefore, the promotion of aluminum alloy wheels is of great significance for energy conservation, emission reduction and low-carbon life.
(2) The thermal conductivity of aluminum is high while that of steel is low, so under the same conditions, the heat dissipation performance of aluminum alloy hub is better than that of steel hub.
(3) Fashionable and beautiful.The aluminum alloy can be age strengthened. The casting billet of the aluminum alloy wheel hub without aging treatment has low strength, and is easy to process and form. The aluminum alloy wheel hub after corrosion resistance treatment and painting coloring has various colors, exquisite and beautiful.
Structural analysis of automobile aluminum alloy wheels
Announce
edit
In order to meet the use function and market demand, the aluminum alloy wheel hub has a variety of structural designs in structure, such as integral and multi piece combination;In terms of appearance, there are wide spokes, narrow spokes, multi spokes, few spokes and other modeling designs.For safety reasons, the appearance and structure design of aluminum alloy wheels must meet the requirements of safety and use functions.For ordinary passenger cars, integral aluminum alloy wheels are sufficient to meet their performance requirements.
Aluminum alloy wheel hub
The structure of the automobile hub is shown in Figure 1, which can be divided into two parts: rim and hub. The specific functional analysis of each part is shown in Figure 2.
Performance requirements of automobile aluminum alloy wheels
Announce
edit
There are many types and structures of aluminum alloy wheels, and their requirements vary from vehicle type to vehicle model. However, strength and precision are the most basic common requirements.According to market research, car hubs should have the following properties:
1) The material, shape and size are correct and reasonable, which can give full play to the function of the tire, and can be interchanged with the tire, with international universality;
2) When driving, the longitudinal and lateral runout is small, and the imbalance and moment of inertia are small;
3) On the premise of lightweight, it has sufficient strength, stiffness and dynamic stability;
4) Good separability with axle and tire;
5) Excellent durability;
6) Its manufacturing process can meet the requirements of stable product quality, low cost, multiple varieties and mass production.
Forming method of automobile aluminum alloy hub
Announce
edit
At present, the production methods of aluminum alloy hub mainly include casting, forging, stamping and spinning.The manufacturing of aluminum alloy wheels in China is still dominated by low-pressure casting, and some advanced manufacturing processes have not yet been adopted.However, the manufacturing technology of aluminum alloy wheel hub is constantly developing. In order to improve its performance, it is now developing towards squeeze casting (liquid forging) and semi-solid forging.[1]
