A finishing work roll of a large aluminum hot rolling mill and its induction quenching method

Abstract

The invention belongs to the field of roller heat treatment and discloses a working roller made of a new material and used for a large aluminum hot mill and an induction quenching method of the working roller. Components of the working roller comprise, by mass percentage, 0.40%-0.85% of C, 3.50%-5.50% of Cr, 0.40%-0.80% of Si, 0.40%-0.80% of Mn, 0.30%-0.70% of Ni, 0.50%-1.20% of Mo, 0.30%-0.70% of V, not larger than 0.020% of P and not larger than 0.020% of S. The manufacturing method includes the following steps that a, the roller is subjected to primary preheating in a drying oven; b, the roller is mounted on a double-frequency quenching machine tool, and an inductor conducts heating from bottom to top; c, the chamfer or the oblique plane of the lower end of a roll body is subjected to primary machine tool preheating; d, on the position of the chamfer or the oblique plane, the quenching machine tool is started so that the inductor can move from bottom to top in the axial direction of the roller, and then water cooling is conducted; e, roller tempering is conducted; f, the hardness of the roller is detected; g, semi-finishing grinding and finished product grinding are conducted; and h, a product is subjected to ultrasonic testing.

Description

technical field [0001] The invention belongs to the field of roll heat treatment, and in particular relates to a finishing work roll of a new material aluminum hot rolling mill and an induction quenching method thereof. Background technique [0002] The main research of this project is a new material of large-scale aluminum hot rolling mill finish rolling work roll. Aluminum and its alloys have many excellent properties and are widely used in aerospace, aviation, high-speed rail, and daily life. With the rapid development of my country's economy, the demand for aluminum and its alloy products is increasing, and the requirements for the surface quality of aluminum sheets are also getting higher and higher. Therefore, the performance requirements for hot rolls for rolling aluminum sheets are also getting higher and higher. At present, the hot-rolled work rolls mainly used for rolling aluminum plates are mainly made of Cr3 series materials, but the wear resistance and service ...

AI Technical Summary

Problems solved by technology

[0003] Finishing work rolls of large aluminum hot rolling mills, with a diameter of 750 mm, are manufactured according to the conventional cold roll manufacturing method, and the surface is induction quenched after conditioning. The main problems are that the quenching stress is large, the soft-hard junction area is easy to crack, and the structure and hardness are uneven. Case