Introduction of Wet Knotting Technology for Induction Melting Furnace

Induction melting furnace, an indispensable equipment for the modern foundry industry that combines strength and cost performance, its appearance has broken the melting equipment circle led by the traditional power frequency furnace, and has completely entered the intermediate frequency era in the foundry industry. In the process of melting and casting of induction melting furnace, there is a process link that is very important, which is the knotting process of the hearth of the induction melting furnace. However, such an important link has been unsatisfactory in the method research for many years, and it was not improved until the wet knotting technology of the induction melting furnace was used. So what's so magical about this furnace hearth wet knotting technology? Let Xiaobian take everyone to decrypt it today.

1.Basic methods

In the early days of the application of the wet-type furnace gallbladder knotting technology, we used silica sand as the base material for the gallbladder knotting material. The basic ingredients are: silica sand: 2 # (8 ～ 10 mesh) 5%, 3 # (10 ～ 26 mesh) 35%, 4 # (16 ～ 24 mesh) 35%, 8 # (250 ～ 400 mesh) 25%; Boric acid: 2.5%; water: 8%. After three-dry-three-wet rebuilding, knots are gradually added to the furnace mouth by using a vibrating rod while feeding. After 4 to 6 hours of natural drying (depending on the temperature), pull out the steel mold, and then dry naturally for not less than 2 hours (depending on the temperature, it is better to extend the natural drying time to 8-10 hours when possible). After making the furnace collar, put 6-8 steel pipes in the furnace against the furnace wall, put a steel pipe (with its own base) in the middle, and then start the power oven. The specifications of the oven are the same as those of the dry-knotted furnace tube.

2.Comparison with traditional knotting technology

After understanding the basic method of the induction melting furnace wet knotting technology, let's compare how it is different from the traditional knotting method. First of all, compared with the traditional dry knotting, the furnace knot produced by the wet knot has no layer seams that occur when dry knotting occurs, and the added furnace charge is filled evenly under the action of a vibrating rod. The moisture is constantly rising, which ensures that the combination of the newly added furnace charge and the furnace charge first entered does not delaminate. Especially later, we used a mixer to beat the charge, and completely eliminated the labor intensity problem of the furnace. Not only does the knotting furnace tube become easy, but the quality is fully guaranteed. Today, we use refractory aggregates (a multi-specification furnace charge preparation) produced by professional factories to make knotting easier. The only drawback is that the physical strength is not as high as that of the dry knotted furnace. However, as long as the melting operation is performed according to its characteristics, its deficiency is not a problem.

3.Advantages of Wet Furnace Knot Technology

Induction melting furnace bile wet knotting technology, as a new kind of furnace knotting technology in recent years. It solves the problem that the furnace tube knotting work that has been plagued us is labor-intensive, time-consuming, and the quality of knotting is difficult to grasp. Moreover, the furnace tube knotted by this method is also easy to disassemble. Almost the same.

4.Technical Points of Wet Furnace Knotting Technology

1. The support of the water content of the stirrer should be dry or wet, so as to avoid excessive water overflow during knotting.

2. The oven should be carried out separately, and the oven should not be brought. For the first time smelting, especially the initial charge, the charge should try to hit the bottom and the wall of the furnace as much as possible, and other times, avoid using the furnace wall as a support to stir the charge.

3. Pay special attention not to shed the material when adding the charge, to avoid the emergence of the feeding operation.

4. When the furnace bladder is partially detached, it should be plugged with wet furnace material after being painted with water glass and compacted.