Hot roll for rolling aluminium products and manufacturing method thereof

Abstract

The invention discloses a hot roll for rolling aluminium products and a manufacturing method thereof. The hot roll is prepared from the following chemical constituents in percentage by weight: 0.50-0.80% of C, 0.20-1.50% of Si, 0.20-1.00% of Mn, no more than 0.025% of P, no more than 0.025% of S, 4.50-6.00% of Cr, 0.50-2.00% of Mo, 0.10-1.00% of V and the balance of Fe and inevitable impurities. The manufacturing method for the hot roll for rolling aluminium products includes the technological steps of steel ingot refining, roll blank forging, hardening and tempering as well as machining, quenching thermal treatment, tempering and the like. The hot roll for rolling aluminium products, which is provided by the invention, has high wearing resistance, excellent hot cracking resistance and electrochemical corrosion resistance, and the service life of the hot roll is prolonged by 50% above in comparison with that of a common hot roll made of Cr3 material.

Description

technical field [0001] The invention relates to a roll and a manufacturing method thereof, in particular to a hot rolling roll for rolling aluminum and a manufacturing method thereof. Background technique [0002] The roll is an important part of the rolling mill in the rolling mill and an important consumable part that determines the efficiency of the rolling mill and the quality of the rolled product. The rolls use the pressure generated by a pair or a group of rolls to roll the rolled piece, so that the rolled piece produces plastic deformation and obtains an ideal design shape. Therefore, the quality of the roll is directly related to the surface quality of the rolled product and the rolled steel. machine productivity. It is mainly subjected to dynamic and static loads, wear and temperature changes during rolling. [0003] According to different working conditions, rolls are usually divided into cold rolls and hot rolls. In the hot rolling process, the rolls are subje...

AI Technical Summary

Problems solved by technology

[0007] (1) Rolls made of Cr3 series materials have poor wear resistance and short roll changing cycle. Frequent roll replacement seriously restricts the production efficiency of continuous rolling equipment, increases the labor intensity of workers, and makes the production cost of products remain high; At the same time, due to the wear and tear of the roll, the shape retention ability of the roll is poor, the dimensional accuracy and shape of the rolled aluminum plate are difficult to guarantee, and the product quality is reduced;

[0008] (2) During the rolling process, since the roll is a steel material, the electrode potential of the aluminum plate is different from that of the aluminum plate, so the processing system composed of the roll, aluminum plate and rolling lubricant becomes a chemical primary battery system. , the roll is subjected to electrochemical corrosion under rolling stress conditions and stress fatigue under corrosion conditions at the same time, thermal cracks are prone to appear on the surface of the roll body, and the grinding amount of the off-machine is large, which further aggravates the wear of the roll and shortens the life of the roll;

[0009] (3) After thermal cracks appear on the surface of the roll, it is easy to print on the aluminum sheet during rolling, resulting in poor surface quality of the rolled aluminum sheet and high scrap rate