Guarantee method of hardness of downlight shell
The shell of downlight is usually processed by high-temperature smelting, so it has strong talent of high-temperature and high heat resistance and stable chemical properties. In order to let us better choose to use the line lamp housing, we need to know the production process of the line lamp housing, so that we will have a general understanding of the line lamp housing in the purchase process, and it will not be difficult to choose.
1. Charge treatment
Preheating is required before all furnace materials are put into the furnace to remove the moisture attached on the surface and shorten the smelting time.
2. Preparation of crucible and melted things
(1) before using the new crucible, clean it and carefully check whether there are penetrating defects, admit that there are no defects before putting it into use, preheat it to dark red, keep it warm for more than 2 hours, so as to burn away the water and combustible substances attached to the inner wall of the crucible. After cooling, carefully collect the inner wall of the crucible, spray the paint when the temperature is not lower than 200 degrees, and dry it thoroughly before using.
(2) it is necessary to remove the remaining metal, oxide skin and other dirt before using the pressure spoon, mixing spoon, ladle and other smelting things, and brush the protective coating after preheating, and then dry it for use.
3. Smelting temperature control
The alloy liquid is rapidly raised to a higher temperature and stirred reasonably to promote the dissolution of all the alloy elements. After admitting that all the elements are dissolved, it is refined and degassed. After removing the scum, it will reach the pouring temperature. (because the temperature of aluminum solution is difficult to be judged by the naked eye, it is necessary to control the temperature with the surface of temperature measurement, which shall be calibrated and repaired regularly; the thermowell shall be cleaned with metal brush periodically and coated with protective coating to ensure the accuracy of temperature measurement results and the extended service life.
4. Control of smelting time
In order to reduce the oxidation and air absorption of the aluminum profile solution, the residence time of the aluminum solution in the furnace should be shortened as far as possible, and the aluminum solution should be melted quickly. In order to speed up the smelting process, it is necessary to take part in the medium lump and low melting point materials first, so as to form a molten pool at the bottom of the crucible quickly, and then add aluminum ingot, so that it can slowly immerse into the gradually expanding molten pool and speed up the melting; After the first part of the furnace charge is melted, the alloy elements with high melting point and small quantity will be added. The melting will be accelerated by heating and stirring, and finally the alloy elements that are easy to oxidize will be pressed in.
The quality of the melt has a decisive influence on the processing function and the final application function of the aluminum profile. If the quality of the melt is inherently insufficient, it will bring potential danger to the application of the products. Therefore, smelting is also a key process for the distribution of the quality of the processed products.
Article source: downlight shell manufacturerhttp://mushuren.cn/
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