A method for casting the journal of a finished roll by using a protective sleeve

Abstract

The invention discloses a method for cast-bonding of a journal of a finished product roller through a protective jacket, and belongs to the field of roller repairing. The method comprises the steps of flaw detection, truncation, protective jacket manufacturing, protective jacket installation, cast bonding, protective jacket dismounting and the like. The method effectively solves the problem that a traditional cast bonding process is prone to scalding and bumping the roller, the cast-bonding repairing success rate is improved, and the cast-bonding repairing difficulty of the finished product roller is greatly reduced.

Description

technical field [0001] The invention relates to the repair field of rolls, in particular to a method for casting the journal of a finished roll by using a protective sleeve, which is used for casting and repairing a roll with a defective journal. Background technique [0002] During the casting process of the roll, due to factors such as untimely riser feeding and substandard pouring temperature control, etc., the inner looseness of the journal will often be caused, especially for rolls with a long roll body, a large roll body diameter and a relatively thin journal. This situation is particularly serious. For serious loose journals, the rolls need to be repaired by casting. The so-called casting repair is to cut off the loose part of the journal, recast the cut part, and process it. [0003] This type of casting method is mostly used for the repair of the roller blank. Since the roller blank has not been processed yet, there is a machining allowance, so the defective rolle...

AI Technical Summary

Problems solved by technology

However, for the finished rolls that have been machined, many problems will arise if they are repaired by casting.

[0004] First, after the casting and pouring of the finished roll is completed, during the process of solidification and shrinkage of molten steel or molten iron, due to the existence of thermal expansion and contraction, the newly casted journal will stretch the journal below the casting joint, resulting in The size of the neck diameter direction becomes smaller

Second, it is easy to damage the rolls during the pouring process, and it is easy to burn the finished rolls during the injection of the casting liquid, and even cause the rolls to be scrapped.

[0005] In the prior art, there is no effective countermeasure for the above problems

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