WO2017063249A1 - Preparation method for cold-worked seamless aluminum alloy hub - Google Patents

Abstract

A preparation method for a cold-worked seamless aluminum alloy hub comprises: adopting aluminum alloy extruded tubes of which the diameter is the same as that of a rim, the axial length is 60%-80% of the axial length of the rim, and the volume is greater than the volume of the rim, and rotationally pressing, thereby extending the axial length thereof and lessening the volume thereof, and acquiring the rim; stamping and preparing a spoke by adopting an aluminum alloy panel; and welding the rim and the spoke into a whole by adopting friction stir welding. The method adopts aluminum alloy extruded tubes which are equal in diameter, short and large in volume for manufacturing a rim, on one hand, the extruded tubes are uniform in texture, the inner stress is very small, and the manufactured rim has no cask effect, thereby optimizing the weight of the rim and the cost of raw materials; and on the other hand, the strength of an extruded product is close to forging, the cost is also low, the volume of the extruded tubes can also be lessened while the axial length thereof is extended by rotationally pressing the extruded tubes, namely, being more compact, thereby further increasing the strength, and aiding in further reducing the weight of the rim and the cost of raw materials.

Description

Method for preparing cold-worked seamless aluminum alloy wheel hub Technical field

The invention relates to the field of wheel hubs, and in particular to a method for preparing a cold-worked seamless aluminum alloy wheel hub.

Background technique

With the rapid development of the automobile industry, China's automobile production has exceeded 20 million in 2013, making it a veritable automobile production country. The wheel hub is an important part of the car. The aluminum alloy wheel hub gradually replaces the position of the steel wheel hub because of its light weight, good heat dissipation and beautiful appearance. The aluminum alloy wheel hub can be divided into three types: integral casting type, integral forging type and composite type. Casting hubs are currently the lowest manufacturing cost, and their output accounts for about 90% of the total hub production. The overall forged wheel performance is better than the overall forged hub, but its manufacturing cost is higher, and the performance of the composite hub is close to the overall forging. The performance of the wheel hub, while the manufacturing cost is closer to the overall cast wheel hub, is favored by customers.

The composite hub is divided into two composite and three composites. The two composite hubs are composed of a total of two rims and spokes. The spokes are generally cast or forged, and the rim is not only cast or forged, but also the rim. There are spinning rims. The current spinning rims are generally made by rolling aluminum alloy sheets, welding them into cylinders and then spinning them. The strength of the welds is only about 95% of the aluminum alloy sheets, according to the barrels. The effect, in order to achieve the overall strength of the rim, must ensure that the strength of the weld is up to standard, that is, the strength of the aluminum alloy plate must meet a new standard higher than the rim strength standard, and the most effective way to improve the strength of the aluminum alloy plate It is to increase the thickness, which makes the current spinning rim must have a thicker wall to ensure the strength is up to standard, and the weight and raw material cost are increased; in addition, the current composite wheel preparation has a heating process and high energy consumption. And not environmentally friendly.

Summary of the invention

The technical problem to be solved by the present invention is to provide a method for preparing a cold-worked seamless aluminum alloy wheel hub, which can solve the problem that the spinning rim of the existing composite wheel hub is rolled and welded into a cylinder by an aluminum plate, and the strength of the weld seam is low. The strength of the aluminum alloy sheet must be increased to ensure that the weld strength is up to standard, resulting in increased weight and cost of the rim.

The invention is achieved by the following technical solutions:

The invention discloses a method for preparing a cold-worked seamless aluminum alloy wheel hub, which has the same diameter as the rim and an axial length of the rim An aluminum alloy extruded tube having an axial length of 60% to 80% and a volume larger than the rim volume is subjected to spinning to extend its axial length and reduce the volume to obtain a rim;

Preparation of spokes by aluminum alloy plate stamping;

The rim and the spoke are welded together by friction stir welding.

According to a further aspect of the invention, the aluminum alloy extruded tube is made of a 5-series aluminum alloy or a 6-series aluminum alloy or a 7-series aluminum alloy.

The advantages of the present invention over the prior art are:

First, the aluminum alloy extruded pipe with equal diameter, short and slightly larger volume is used to make the rim. On the one hand, the extruded pipe has uniform texture and the internal stress is small, and the produced rim does not have the barrel effect, thereby optimizing the weight of the rim. And the cost of raw materials; on the other hand, the strength of the extruded product is close to forging, the cost is still low, and the extrusion tube is rotated to make its axial length extend, and the volume is also reduced, that is, it becomes denser and further improves the strength. Conducive to further reducing the weight of the rim and the cost of raw materials;

Second, all use cold processing, no heating, energy saving and environmental protection, reducing the cost of the hub;

3. Extrusion tube made of 5 series aluminum alloy or 6 series aluminum alloy or 7 series aluminum alloy, the spinning process does not need heating, the process is simple, and the energy consumption is low, which is beneficial to further reduce the manufacturing cost of the rim;

Fourth, the size of the whole aluminum alloy plate is relatively fixed, and the rim has a variety of sizes, the cutting material forms more scraps, the raw material is wasted, and the extruded pipe can be cut to any length as needed, and the raw material utilization rate is high and the waste is small.

detailed description

The invention discloses a method for preparing a cold-worked seamless aluminum alloy wheel hub, which adopts an aluminum alloy extruded pipe having the same diameter as the rim and an axial length of 60% to 80% of the axial length of the rim and a volume larger than the rim volume, and is axially rotated by the rim. The length is extended and the volume is reduced to obtain the rim. The axial length of the extruded aluminum alloy tube can be calculated according to the difference of the wall thickness; the spokes are prepared by pressing the aluminum alloy plate; the rim and the spoke are welded by the friction stir welding. The aluminum alloy extruded tube is made of a 5 series aluminum alloy or a 6 series aluminum alloy or a 7 series aluminum alloy.

Claims (2)

Method for preparing cold-worked seamless aluminum alloy wheel hub, characterized in that: The aluminum alloy extruded tube having the same diameter as the rim and having an axial length of 60% to 80% of the axial length of the rim and a volume larger than the rim volume is subjected to spinning to extend the axial length and reduce the volume to obtain a rim; Preparation of spokes by aluminum alloy plate stamping; The rim and the spoke are welded together by friction stir welding. The method for preparing a cold-worked seamless aluminum alloy wheel hub according to claim 1, wherein the aluminum alloy extruded tube is made of a 5-series aluminum alloy or a 6-series aluminum alloy or a 7-series aluminum alloy.