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The KEY points of fiberglass cap filter working temperature

Feb. 05, 2024

As a filter equipment often used in industrial production, cap filter plays an important role in metal smelting industry. In recent years, with the development of industry, its application is more and more wide.


The cap-style is woven with special high-twist & high-strength alkali-free fiberglass and special post-treatment. The maximum temperature resistance can reach 900 ℃.

 

It is widely used in automobile and motorcycle wheels, cylinder pistons, aluminum rods, aluminum materials, aluminum ingots, aluminum plates and precision casting of all types of aluminum alloy casting.


What is the use temperature of fiberglass cap filter


What is the use temperature of fiberglass cap filter? 


1. The use temperature of cap filter.


It is divided into working temperature and softening temperature.

● The working temperature of aluminum water filter is 700~800 ° C.

● The softening temperature is 900 ° C.

We need to choose the suitable filter according to the different pouring temperatures of liquid aluminum, rather than let the filter working temperature affect the pouring temperature of the liquid metal in turn, which will cause more casting defects and lose the meaning of filtration. Talk to a fiberglass cap filter expert about choosing the right filter.


2. The reasons for the change of fiberglass cap filter temperature.


1. The initial temperature of liquid aluminum is too low. This is a more common reason.

2. The design of pouring system is unreasonable. The heat dissipation is too fast, or the metal is not preheated, so that the metal liquid is sharply cooled in the process of entering the cavity.

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3, Operation error. The initial overheating temperature reservation is too high. As far as possible to ensure that the casting process meticulous specification is the main way to solve the problem.


3. The control measures of use temperature of fiberglass cap filter.


① Do not exceed the filter operating temperature.

From the perspective of filtration, exceeds the working temperature limit, the filter will lose its original performance because of overheating softening, and it will not play the role of filtration. Therefore, the working temperature of the filter must not be exceeded.


② Use induction furnace for smelting.

In production, using induction furnace melting can better control the liquid metal temperature. Reasonable control of the pouring process, to consider the time required for each step, to avoid some step that waited for a long time to make liquid cool. This requires that the liquid metal initially have a certain overheating temperature, and pay attention to heat preservation at any time during the pouring process.


③ Increase the temperature of liquid aluminum when coming out from smelting furnace.

It is necessary to increase the temperature of the aluminum liquid and appropriate sedation to facilitate the floating and aggregation of non-metallic inclusions. Remove the residue on the surface of the liquid aluminum, and put the covering agent (perlite, plant ash, etc.) on the surface of the liquid aluminum to prevent the oxygenation of the liquid aluminum. Choose the appropriate pouring temperature, try not to lower than 1350℃.


④ Shorten the solidification time.

Under normal circumstances, the higher the pouring temperature, the greater the tendency of graphite to float, because the casting in liquid state for a long time is conducive to the precipitation of graphite. It is found that if the solidification time is shortened, the floating tendency of graphite decreases with the increase of pouring temperature.


What is the use temperature of fiberglass cap filter


In summary, in the case of grasping a reasonable pouring time, the appropriate working temperature of the filter is very reasonable for the casting, after all, the design of fiberglass cap filter is to reduce the scrap rate of the casting.


What Is the Use Temperature of Fiberglass Cap Filter?cid=3


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