During the metal rolling process, the surface of the roll is prone to wear and fall due to strong extrusion and friction. In order to increase the service life of the rolls, the roll manufacturers have taken some mechanical manufacturing measures.
Typically, the rolls are initially made of 45 steel. Before grinding, we tempered the entire quenching roll at low temperatures. However, 45 steel rolls have a low service life and cannot meet the growing production demands. Now, we can use 9SiCr steel to make sheet metal rolls to meet demanding customers. This greatly increases the service life of the rolls and fundamentally changes the disadvantages of the life of the rolling mill.
9SiCr steel is an alloy tool steel. It is an alloy steel with a small amount of alloying elements added to the carbon tool steel. Its average carbon content is 0.9%. The main alloying elements are chromium and silicon, both of which contain less than 1.5%. 9SiCr steel has high strength, hardness and wear resistance. At the same time, it has high hardenability during heat treatment. The internal structure of the material has fine grains and good fatigue resistance. It is one of the high quality materials for the manufacture of plate cylinders.
The manufacture of roll blanks is usually achieved by forging. In production, there are many factors that affect the forging process, such as heating of the forging blank, selection of the forging temperature, and determination of the forging method.
Updated forging heating equipment.
Reduce the forging temperature range.
Improvements in the forging method.
Adjust the cutting process
Prior to roughing, the roll mill manufacturer will quench the billet. Before the rolling billet is manufactured, the manufacturer should first anneal the forged billet to eliminate the internal stress of the forging, reduce the hardness of the forging, and facilitate the cutting process. The hardness of the billet after quenching treatment is usually about HB220.
Cutting tool update
Update tool materials.
Improve tool structure.
Upgrade the final heat treatment process
Advanced final heat treatment equipment is used.
Use a new quenching medium.
There are many measures to improve the life of the sheet metal roll. First, we can replace the material with 45 steels used in the original roll manufacturing with 9SiCr steel alloy tool steel. In this way, we have fundamentally improved the performance of the drum.
In addition, with the improvement of the blank forging process, the adjustment of the cutting process and the upgrading of the heat treatment process, the working surface hardness of the roll can be improved, the microcracks are greatly reduced, and the anti-wear and anti-fatigue properties are remarkably enhanced. .
Therefore, we can effectively extend the working life to meet the needs of users.
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