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We are supplying Chilled cast iron rolls for rubber industry,plastics industry,paper industry, and other industries.
1. The rolls are made of special cast iron. The working surface of the roll is chill cast,forming a very hard and excellent wear-resistant shell.
2. We are supplying rolls cored, drilled, or assembled.
3. The rolls can be supplied as casting, or as wholly machined ones,including turning,grinding,drilling.keyway cutting,thread taping.etc. The working surface of the roll can be ground cylindrical or crowned.We are making groove rolls as well
4. We are using either the ordinary gravity pouring process or the centrifugal pouring process,or a combination of both processes.Customers are free to choose which process they prefer.
5. The centrifugal pouring process for big size rolls is a recently developed pouring process.The notable advantages of rolls made by centrifugal pouring process vs rolls made by ordinary gravity pouring process are:
1).The chill cast shell and the inner part of the roll can be poured separately. Thus different composition of iron for the shell and for the inner part can be chosen freely according to different requirements.
2).The thickness and the hardness of the chill cast shell can be controlled more precisely and uniformly.
3).The molten iron is condensed under the centrifugal force.The surface of the shell is free from porosity, sand hole, slag inclusion, or other casting defects.
4).When the roll is made by ordinary gravity pouring process, there is always a layer of mottled iron formed between the white iron(chill cast iron) and the gray cast iron.When drilled roll is used, this mottled cast iron layer always makes the drilling very difficule.When the roll is made by centrifugal pouring process, there is no mottled iron layer formed at all. The mottled iron layer problem no longer exists. The drilling can be done easily and precisely.
5).When proper materials are used and centrifugal pouring process is adopted. the hardness of the chill cast shell can hold as high as HS 74+/-2.The tensile strength of the roll can reach as high as 250 MPa. The working life of the roll made by centrifugal pouring process would be three to five times the working life of the rolls made by ordinary gravity pouring process.
The sizes of rolls we are supplying are:
(Diameter X Working Length in mm)
360 X 1500; 400X1000; 450X1200; 480X800-1500; 510X800-1600; 550X1500;
560X1530-2000; 610X1730-2500; 650X2130; 660X2130-3000; 700X2500-3500;
800X2500-4000; 900X2500-4000
Chilled cast iron rolls