Hub manufacturing technology

Abstract

The present invention discloses a production technique of a hub, which includes the following steps: (1) a rotary table is fabricated by the casting technique; (2) the cut plank stuff for a wheel felloe is rolled into a cylinder, the gap of which is welded and the burr of which is cleared out; (3) on a vertical press, the cylinder is pressed and flared; (4) on a spinning machine, the flared cylinder is formed into the wheel felloe by spinning; (5) on a positioning tooling workbench, the rotary table formed in the step (1) and the wheel felloe formed in the step (4) are welded by friction stir welding. The technique only applies the horizontally parted upper-lower mold type structure, thus leaving out the side form structure necessary for the traditional hubs, greatly simplifying the structure and the cost of foundry molds and avoiding the production of casting thermal centre in the process of casting. Because the wheel felloe and the rotary table are jointed by friction stir welding, which is a mature welding technique, the mechanical properties of the jointed part are ensured, and the problem of that the 90-degree impact experiment fails is resolved.

Description

technical field [0001] The invention relates to the manufacturing technology of a wheel hub, in particular to a wheel hub manufacturing process. Background technique [0002] Traditional wheels can be divided into the following structures according to the combination of rim and disc: [0003] 1. One-piece (integral) hub: the rim and the disc are composed of a whole; [0004] 2. Two-piece hub: a structure that combines the rim and the disc, and the connection method can be welded or threaded; [0005] 3. Three-piece hub: a structure composed of two rim parts and a wheel disc, and the connection method is generally threaded connection. [0006] Therefore, there are one-piece (integral) manufacturing, two-piece manufacturing and three-piece manufacturing in the manufacture of hubs. [0007] 1. One-piece manufacturing: Gravity casting or low pressure casting is adopted, and the raw material is A356 or AlSi11 aluminum alloy. Compared with the two, although the equipment inves...

AI Technical Summary

Problems solved by technology

[0009] 2. Traditional wheels have casting heat joints at the junction of the wheel disc and the rim. Figure 1 is a low-pressure casting structure diagram of a traditional aluminum alloy wheel hub. In the figure, a casting heat joint is formed at the intersection of the rim and the wheel disc (the black circle in Figure 1 Part), there is an obvious difference in wall thickness between the hot joint and the rim, which greatly inhibits the casting solidification process and product quality improvement of the hub:

[0010] (1) The large wall thickness difference is likely to cause the shrinkage stress of the joint to shrink, which brings hidden dangers to the impact of the wheel during use;

[0011] (2) The solidification speed at the casting hot spot is slow, and it becomes the part where the casting is least likely to be effectively fed. Usually, it is difficult to achieve absolutely no possibility of shrinkage here. In most cases, the degree of shrinkage here is at Level five or above is the most dangerous section of the entire hub;

[0012] (3) In order to ensure the unsafety caused by the shrinkage and porosity at the casting hot joint, manufacturers often increase the wall thickness at the junction with it to reduce the wall thickness difference, but this mitigation method is exactly related to the weight reduction of the wheel The goal is exactly the opposite;

[0013] (4) Due to the existence of casting hot spots, it brings fatal damage to the sequential solidification conditions of the cavity, and brings great difficulties to mold design and temperature field control in casting, which directly affects the defective rate of products and also related to the rise of the overall production cost

The two-piece structure and manufacturing process not only determine its high manufacturing cost, but also determine its uniform appearance. Specifically, this manufacturing process can only manufacture wheels with a deep wheel lip appearance

[0017] Three, three-piece manufacturing: similar to the two-piece manufacturing process, the disadvantages are also similar

However, this technology has not yet been applied to the joining process of the rim and disc of the hub

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