Why choose LMM ROLLS?
LMM GROUP main products focus on the cold and hot plate & wide strip mill rolls and heavy section mill rolls and big casting & forging pieces. We can provide characteristic service and differentiated products according to the different conditions of rolling mill.
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High-speed steel has only been used as a roll material for more than ten years. The reason why high-speed steel rolls are suitable for both plate and strip mills, wire and bar mills, and has achieved remarkable results is that high-speed steel has high The high wear resistance and hardenability, especially the red hardness at high temperature, make high-speed steel more suitable for use as a manufacturing material for rolls. At present, high-speed steel roll series products are widely used in:
● High-speed bar pre-finishing stand, finished product stand, finished product pre-rolling stand, pre-slicing stand, slitting stand of bar rolling mill
● High-speed wire rod mill pre-finishing mill
● Hot rolling narrow and medium wide steel rolling mill finishing line
● Finishing stand of spring flat steel mill and small section steel mills such as angle steel and channel steel
Compared with traditional ductile iron rolls and high-nickel-chromium rolls, high-speed steel rolls have higher steel passing per groove (times) due to their good wear resistance, which saves roll changing time, improves rolling mill operation rate, reduces roll consumption, and reduces production. cost, and improve the overall efficiency of the factory. Generally, the amount of steel passing in a single groove (times) is 3 to 5 times that of cast iron rolls, and the total amount of passing steel can be guaranteed to be more than 4 times on average. The following table shows the use effect of high-speed steel rolls on continuous bar rolling mills:
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Product design→ Roll blank design→ Roll blank manufacturing→ Roll blank acceptance→ Annealing→ Rough turning→ Ultrasonic flaw detection→ High temperature quenching→ Low temperature tempering→ Ultrasonic flaw detection→ Finishing→ Ultrasonic flaw detection→ Roll body grinding→ Roll numbering→ Inspection→ Cleaning → Packing → Shipping → Warehousing → Inspection → Use and Maintenance → On-site Communication → Design Improvement.
As can be seen from the flow chart, roll manufacturing forms a closed-loop system from product design, production and manufacturing, use and maintenance, and improved design, and the quality of rolls is constantly improving.
First of all, the production and manufacturing must be organized according to the product drawings and technical requirements agreed by both the supplier and the buyer. The main standards are:
GB/T 13313-2008 Roller Shore, Leeb Hardness Test Method
GB/T 1503-2008 Cast steel rolls
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