What methods are generally used to melt insulated bridge aluminum profiles

What methods are generally used to melt insulated bridge aluminum profiles

May 14 2020

The production of insulated bridge aluminum profiles basically requires high-temperature smelting processing, so the aluminum profile will have a high temperature resistance and the related chemical properties will be relatively stable. In order to allow you to better use aluminum profiles, we need to understand the smelting of insulated bridge aluminum profiles, so that we can have a general understanding of aluminum profiles when buying, and it will not be very difficult to buy.

1. Furnace charge treatment, preheating is required before all the charge is put into the furnace, this is to remove the adhered moisture on the surface and shorten the melting time.

2. Preparation of Crucible and Smelting Tools

1. Before using the new crucible, it is generally necessary to clean it and carefully check for penetrating defects. Confirm that there are no defects before putting it into use. Preheat it to a dark red color. Remember to keep it warm for 2 hours. Above, in order to burn off the water and combustible substances attached to the inner wall of the crucible, wait for cooling, then you need to carefully clean the inner wall of the crucible, when the temperature is not less than 200 degrees, spray the paint, dry and dry it. Used.
insulated bridge aluminum profiles
2. Before using the smelting tools such as pressure spoon, stirring spoon and ladle, you must remove residual metal and oxide scale and other contaminants. After preheating, apply protective coatings, and then dry them after use.

3. Control of melting temperature

The alloy liquid can generally be quickly raised to a higher temperature, and then stirred to promote the dissolution of all alloy elements. After confirming that all elements are dissolved, refining and degassing can be carried out, and the scum will be removed to the pouring temperature .

Because the temperature of the aluminum solution is generally difficult to judge with the naked eye, it is generally necessary to use a temperature measuring instrument to control the temperature. The temperature measuring instrument should be regularly calibrated and repaired; the thermowell should be cleaned periodically with a metal brush and coated with protection To ensure the accuracy of temperature measurement results and extend the service life.

4. Control of smelting time

In order to reduce the oxidation and gettering of the aluminum profile solution, it is generally necessary to shorten the residence time of the aluminum solution in the furnace for rapid smelting. In order to speed up the smelting process, it is necessary to add medium-sized, low-melting melting furnace feedstock to form a molten pool at the bottom of the crucible as soon as possible, and then add aluminum ingots, so that it can be gradually immersed in the gradually expanded molten pool and accelerate melting.

After the main part of the charge is melted, alloy elements with a relatively high melting point and a small amount are added, and the temperature is increased and stirred to accelerate the melting. Finally, the temperature is lowered, and alloy elements that are easily oxidized are pressed.

The quality of smelting has a decisive influence on the processing performance of insulated bridge aluminum profiles. If the quality of the melt does not meet the requirements, it will bring potential danger to the system. Therefore, smelting is also a key process that controls the quality of processed products. .