Alloying treatment method for surface of spheroidal graphite cast iron roll

Abstract

The invention discloses an alloying treatment method for the surface of a spheroidal graphite cast iron roll. The method comprises the following steps that: A. the working surface of the roll to be treated is derusted and is washed clean; B. alloy powder and phenolic resin are prepared into paste alloy coating by using absolute alcohol, and the paste alloy coating is evenly coated on the working surface and is aired or dried; C. laser beams are used to continuously scan the entire working surface in an overlapping way; and D. a handheld grinder installed with a steel wire grinding wheel is used to clear the surface. The treated roll requires no subsequent treatment and can be directly installed on the machine for use. The invention has the advantages that the method is simple and feasible, laser alloying is expanded to spheroidal graphite cast iron finishing rolls and the service life of the rolls are improved by more than 0.9 times.

Description

technical field [0001] The invention belongs to the field of laser processing, and more specifically relates to a surface alloying treatment method for a nodular cast iron roll (nodular iron roll for short), which is suitable for metallurgical rolls such as medium-rolled and finish-rolled bars, channel steel, angle steel, and I-beam. Background technique [0002] With the advancement and development of science and technology, high-performance rolls are used more and more widely. However, the domestic steel rolling industry still uses cast steel and ductile iron rolls in large quantities due to the constraints of cost, capital and technical level, and the usage of ductile iron rolls accounts for more than 50% of the total roll usage. [0003] Although the ductile iron roll is a high-strength cast iron roll, its comprehensive performance is close to that of steel, and the cost is low. However, its hardness and temper softening resistance are far inferior to rolls made of high...

AI Technical Summary

Problems solved by technology

While increasing the hard phase, add some alloy elements that can resist temper softening, so that the working surface of the ductile iron roll has high performance (high hardness, high temper softening resistance, high temperature strength and toughness, high resistance Abrasive) the method of the alloyed layer has not been reported yet

[0007] 2. Surface roughness problem

At present, it cannot be controlled in a small range, which can be used directly without any processing after treatment, which prevents the application of this technology on profile finishing rolls, such as the right angle of angle steel roll finishing rolls

[0008] 3. Crack growth problem

Especially when high-power-density light spots are used to scan ductile iron with high-speed multi-channel overlapping, micro-cracks will form long cracks across the scanning channels, and in severe cases, blocks will fall off and the roll will be scrapped.

This is also one of the main problems preventing the application of this technology at the sharp corners of profile finishing rolls

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