[China Aluminum Industry Network] The future development direction of the wheel will be lightweight, high balance and high strength and toughness. Aluminum alloy wheels are the product of “lightweightâ€, “high speed†and “modernizationâ€. Aluminum alloy wheels are not only beautiful, but also have features such as light weight, energy saving, good heat dissipation, and corrosion resistance. The current factory aluminum alloy wheel heat treatment process specification is: solid-melting treatment (535±5) °C, heat preservation 3-4 hours, quenching medium is water, temperature is 60 degrees, quenching duration is less than 15 seconds; aging treatment (140±5) °C, keep warm for 3-4 hours. The specific process should be adjusted according to the size and heat treatment equipment. Knitting Machine Needle Cylinder,Cylinder Needles,Needle Cylinder,Needle Cylinder Means Changzhou Longfu Knitting Co., Ltd. , https://www.circularmachine.com
All along, the parameters of the heat treatment process are not correct. After the heat treatment of the casting, defects such as unqualified mechanical properties, over-firing, deformation and cracking occur. The main causes are:
1. Low solid-melting temperature or insufficient holding time
2. The cooling rate is not enough when quenching
3. The transfer time of the wheel from the furnace to the quenching tank is too long, exceeding 15 seconds;
4. The aging temperature is too low or the holding time is not enough;
5. When the solution temperature is too high or the holding time is too long, the low-melting point eutectic at the junction of the alloy grain boundaries begins to melt, and a liquid phase appears. Under the action of surface tension, the liquid phase shrinks into agglomerates, spheres, or polygons. The remelted material, when severely burned, will show banded and ring-shaped remelts on all grain boundaries, and even nodule on the wheel surface. When the overfired structure occurs, the mechanical properties of the alloy drop dramatically and cannot be remedied.
The main method to avoid the above-mentioned heat treatment defects is to use a heat treatment furnace temperature tracker to timely detect the heat treatment temperature curve. In the heat treatment process, the deviation can be adjusted in time to ensure the required temperature and temperature difference of the heat treatment process. The temperature tracker is an instrument that measures the temperature distribution of various hot process products. The instrument itself can work at high temperature, and the instrument and the workpiece enter the furnace together to obtain the actual temperature curve and the temperature distribution of the surface and center of the product during the entire process, so that the problems in the baking process can be quickly and timely solved. Able to improve the production capacity of aluminum wheels, improve product quality, reduce production costs and product rejection rate of a powerful helper.
China is a big country that produces aluminum alloy wheels. The temperature curve control of the heat treatment process is the key to quality assurance. In the past, furnace temperature trackers for heat treatment have been dependent on imports. Because the product price is very expensive, it is rarely used in more than 100 hub manufacturing companies in China. The temperature control of the aluminum alloy heat treatment process has a great influence on the quality of the heat treatment, and the temperature profile and the furnace temperature uniformity are very important for the heat treatment. Beijing Savi Metech Co., Ltd. developed the SMT heat treatment furnace temperature tracker for the heat treatment of aluminum alloy wheels. It was successfully applied for the first time in Zhongnan Aluminum, Foshan, Guangdong. The application results show that the precision of the SMT heat treatment furnace temperature tracker is 545±1°C, and the heat insulation effect is superior. It can be used at a temperature of 545 degrees for more than 10 hours. At present, the product has been used by more than 60 aluminum wheel manufacturers, such as Daika, Wanfeng, Jinfei, and Zhongnan Aluminum, and has been exported to Thailand, Malaysia, Indonesia and other countries.