Knotting mould for crucible and knotting method

Abstract

The invention discloses a knotting mould for a crucible. A furnace body wall is arranged on the outer part of an inner ring mould; an outer ring mould is arranged between the inner ring mould and the furnace body wall; the interior of a space which is formed between the furnace body wall and the inner ring mould is filled with a first magnesium oxide dry ramming material; a second magnesium oxide dry ramming material is filled between the inner ring mould and the outer ring mould; and the interior of a cavity body which is positioned between the outer ring mould and the furnace body wall is filled with a mixed dry ramming material. The knotting method comprises the following steps: 1), knotting the furnace bottom, adding the first magnesium oxide dry ramming material in batches, performing degassing and compacting by vibration, and scraping hairs; 2), knotting the furnace wall; 3), performing up-and-down vibration in corresponding positions of the inner ring mould by using a radial vibrator when material addition, compaction and knotting are carried out every three times; 4), ensuring that the space between the outer ring mould and the inner ring mould is equal uniformly; 5), filling the first magnesium oxide dry ramming material between the inner ring mould and the outer ring mould until the knotting operation is carried out completely and the first magnesium oxide dry ramming material arrives at the top of the furnace body wall; 6), performing sealing by using the mixed dry ramming material; and 7), taking out the outer ring mould and completing a knotting operation of the crucible. The knotting mould disclosed by the invention has the characteristics of preventing cracking, buffering high-temperature stress, and improving the anti-vibrating stability.

Description

technical field [0001] The invention belongs to the technical field of metallurgical casting, and in particular relates to a crucible knotting mold and a knotting method. Background technique [0002] In the process of knotting the crucible for ordinary high-temperature alloy vacuum induction furnace, the upper and lower parts of the crucible often use dry material of two kinds of materials. The thermal expansion and contraction near the furnace nozzle, and the alternating changes of cold and heat, so the crucible often produces transverse cracks at the furnace nozzle, that is, at the joint of the two materials; the design and production of the original crucible knotting mold did not consider the water vapor in the dry material Excluded, the quality of the crucible sintered inner wall is good and bad. When there are cracks on the inner wall of the induction furnace crucible or the sintering quality of the inner wall is not good, it is not only easy to wear steel and cause s...

AI Technical Summary

Problems solved by technology

[0002] In the process of knotting the crucible for ordinary high-temperature alloy vacuum induction furnace, the upper and lower parts of the crucible often use dry material of two kinds of materials. The thermal expansion and contraction near the furnace nozzle, and the alternating changes of cold and heat, so the crucible often produces transverse cracks at the furnace nozzle, that is, at the joint of the two materials; the design and production of the original crucible knotting mold did not consider the water vapor in the dry material Excluded, the quality of the sintered inner wall of the crucible is good and bad

When cracks appear on the inner wall of the induction furnace crucible or the sintering quality of the inner wall is not good, it is not only easy to wear steel and cause safety accidents, but also easy to drop slag and blocks at the cracks, which is not conducive to the improvement of the quality of metallurgical ingots

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