Strengthening method of ball mill cast iron roll and strengthened ball mill cast iron roll

Abstract

The invention provides a strengthening method of a ball-mill cast iron roll and a strengthened ball-mill cast iron roll, and belongs to the technical field of metal surface treatment. The strengthening method adopts laser cladding and laser alloying to prepare a base cladding layer and an alloying layer respectively and combines a material for the base cladding layer and a material for the alloying layer, and thus an uncracked base cladding layer and a reinforced alloying layer are obtained. Meanwhile, laser cladding and laser alloying have low heat input, and a smaller heat-affected zone andheat distortion are generated, so the quality of the base cladding layer and the alloying layer are further improved, and the strengthening method overcomes the defect that conventional surface technology, such as surfacing, plasma arc cladding and spray welding, can easily lead to the surface cracking of the ball-mill cast iron roll, but cannot realize the strengthening of the ball-mill cast ironroll. The data of the embodiment indicates that through the actual comparison test, the total amount of steel of the strengthened ball-mill cast iron roll is more than 2 times higher than that of theball-mill cast iron roll.

Description

technical field [0001] The invention relates to the technical field of metal surface treatment, in particular to a method for strengthening a nodular-ground cast iron roll and a strengthened nodular-grinded cast iron roll. Background technique [0002] In the process of rolling steel, the rolls will be worn and fatigued due to various reasons, especially the widely used spheroidal grinding cast iron rolls. How to improve the steel passing capacity and service life of spheroidal grinding cast iron rolls has become a key factor restricting the cost per ton of steel. [0003] Due to the particularity of the material of spheroidal grinding cast iron, traditional methods cannot achieve its strengthening, such as traditional surfacing welding process, spray welding process and plasma cladding, etc., due to their large heat input in the welding process, the surface of the spheroidal grinding cast iron roll is often cracked, As a result, the roll was scrapped and the strengthening c...

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Problems solved by technology

[0003] Due to the particularity of the material of spheroidal grinding cast iron, traditional methods cannot achieve its strengthening, such as traditional surfacing welding process, spray welding process and plasma cladding, etc., due to their large heat input in the welding process, the surface of the spheroidal grinding cast iron roll is often cracked, As a result, the roll was scrapped and the strengthening could not be completed; however, the laser alloying technology alone cannot be directly alloyed and strengthened due to the existence of the fatigue layer on the surface of the used ball-ground cast iron roll.

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