1. The main factors that determine the quality of aluminum alloy wheels Aluminum alloy wheels
The effect of the hub in the application process is mainly related to the following factors: 1) The alloy composition of the aluminum alloy wheel hub; 2) The quality and mechanical properties, including tensile, elongation, hardness and other factors 3) The microstructure density and the size of the inclusions ; 4) Air tightness; 5) Geometric dimension tolerance and shape tolerance; 6) Aluminum alloy wheel surface quality; 7) Whether it has good corrosion resistance. During the use of the wheel hub, due to environmental factors, it will cause gas or liquid corrosion, which will affect the overall performance of the car.
Considering this problem, it needs to be sprayed accordingly. 2. The main production process of aluminum alloy wheels 2.
1 Melting During the smelting process, it is necessary to consider the smelting equipment to better control the donkey temperature. Generally speaking, in order to meet the needs of on-site manufacturing, it is necessary to focus on domestic products. In this way, there is also good convenience in the maintenance process.
At the same time, during the smelting process of the hub, it is necessary to strictly control the iron content to be kept at about 0.15%. As a result, it is necessary to strictly control the selection of ingredients to meet actual needs.
2.2 Refining In the refining process, if you want to ensure a good refining effect, you need to choose a suitable refining method. This paper believes that the "double gas fixation" method can effectively meet the actual needs.
In terms of equipment selection, both imported equipment and domestic equipment can meet this demand. 2.3 Casting When casting, more than 85% of the hub is realized through the "low pressure casting process".
In addition, metal gravity casting was used. 2.4 X-ray inspection In the X-ray inspection process of aluminum alloy wheels, the inspection equipment is mainly based on industrial real-time imaging systems.
The X-ray tube model is 160kVA metallic, which can clearly observe defects such as shrinkage cavities and pinholes, and better meet the needs of aluminum alloy wheel hub production. 2.5 Heat treatment During the heat treatment process of aluminum alloy wheels, it is necessary to consider the temperature of the donkey and apply relevant treatment methods.
Generally speaking, the temperature of heat treatment should be kept within ±5°C. At the same time, it is necessary to grasp the application form of energy, mainly natural gas and electric energy. At the same time, in the process of placing the wheel hub, the product needs to be placed separately, and the material rack needs to be used.
In the heat treatment of the hub, the main methods are hanger type and push plate type. During continuous processing, the temperature should maintain good uniformity. In addition, in order to better improve efficiency and reduce energy consumption, rack-type continuous heat treatment will be better developed and applied in the future.
In view of this problem, in the heat treatment of the hub, it is necessary to pay attention to the better application of new technology. 2.6 Machining In the processing of aluminum alloy wheels, domestic manufacturers mainly use single-axis or horizontal CNC machine tools, and use CNC high-precision machining methods to process aluminum alloy wheels.
In mechanical processing, the traditional process is to process the standpipe off-line, and then use the processing method of turning first and then drilling to ensure high machining accuracy of the wheel. The application of new hub technology improves on traditional methods. The CNC dual-axis machining unit is mainly used for drilling and then turning positioning bolt holes to ensure that the turning speed is at least 2-500t/min, which effectively reduces the machining process and improves the processing efficiency of the wheel hub.
This new technology has gradually become the future development trend of aluminum alloy wheel processing. 2.7 Air tightness detection After the aluminum alloy wheel is processed, it is necessary to check whether its air tightness meets the actual production needs.
Generally, when the hydrostatic test method is used, the air leakage of the aluminum alloy wheel hub is detected by visual inspection. This air tightness detection method is widely used at present. With the development of technology, in the application process of new air tightness testing methods, the simple analysis method of nitrogen can be used to quickly detect the leakage of aluminum alloy wheels, which has the characteristics of better automation and intelligent development.
The application of this technology has greatly improved the efficiency of air tightness testing and has become a new trend in the development of air tightness testing of aluminum alloy wheels. 2.8 Painting The last process in the production of aluminum alloy wheels is painting.
When painting, you need to consider the efficiency and quality of painting. Generally speaking, the painting of wheels at this stage mainly adopts manual and automatic spraying methods. In the manual spraying process, it is difficult to control the thickness of the coating, but the automatic spraying method can control the thickness to about 10mm, and the thickness can be effectively adjusted and controlled.
When spraying paint, a spray gun is mainly used. The painting process is: pretreatment - powder spraying - painting - spraying transparent powder. 3.
Internationally used three rounds of quality testing 3.1 Impact test In the impact test, when the wheel is loaded with tires, it is impacted by weight at an angle of 13° or 30°. It is necessary to ensure that the tire does not leak.
Impact tests are mainly performed by simulating road edges or obstacles on the road. 3.2 Bending fatigue test The bending fatigue test is mainly carried out on the hub.
The periphery of the hub is fixed, and the performance of the hub is tested by the action of cyclic torque. During the test, make sure that the hub does not crack. 3.
3 Rolling fatigue test The rolling fatigue test mainly uses the drum to test the service life of the wheel. The main purpose is to test how the wheel rolls under normal driving conditions. 4.
A simple method to identify the quality of aluminum alloy wheels in daily life 4.1 Manual wheel weight In the manual inspection process of the hub, the strength of the hub can be effectively judged for the hub by analyzing the aluminum content. Generally speaking, the heavier the hub, the stronger it is, and vice versa.
4.2 Tap the side wall of the hub to identify the echo of the hub The quality of the aluminum will affect the knock echo. The clearer the echo, the better the choice of aluminum material for the wheel hub.
If the echo is dull after impact, or there is almost no echo, it can be judged as a poor-quality aluminum wheel. 5 Conclusion With its unique advantages, aluminum alloy wheels have gradually become the leading products in the field of automobile wheels. China is now a powerful country in the production of aluminum alloy wheels.
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