The original Roll Chocks are manufactured by fabricating from cast steel or gray cast iron. The cast iron from which such Roll Chocks are manufactured should contain carbon from 0.2% to 0.3%. In cast Iron Roll Chocks, minor welding repair is possible but major welding repair is not possible to these cast iron Roll Chocks because the major welding repair, large amount of welding material is required.
Manufacturing Process of Roll Chocks
Roll Chocks can also be made of steel casting but in this manufacturing process a great diligence and utmost care are required. Especially, during the formation of precision holes of roller bearings and machining of diameters of these chocks, high degree of accuracy is needed. Surface accuracies of the holes those are present in these chocks is very essential.
Types of Roll Chocks
Roll Chocks are used in different applications and depending upon the nature of the application, the roll chocks are broadly categorized into 4 types. These types of roll chocks are:
- Work Roll Chocks
- Back-up Roll Chocks
- Upper Roll Chocks
- Bottom Roll Chocks
The roll chocks are protected from wearing by the backup roll that presents outside the chock liners. It also permits close clearance between the backup roll chocks and the mill housings. This clearance assist to maintain gaps and roll alignment. For both inside and outside backup roll chock liners, wear resistance is significant. The hardness of the parts which are being contacted by the back up roll chocks is a very important material consideration for the backup chocks. This is because, if there is a difference between the hardness of two contacted parts, then parts having higher hardness will erode the part with lower hardness. Thus, the harness of the housing liner should be higher than the harness of the outside backup roll chock liners.
Roll Chocks Maintaining:Features
The maintenance process of the Roll Chock is very important. The bearings and Roll Chock maintenance process is a comprehensive sub-system of the RMS providing maintenance scheduling and also recording for plain bearing, roll chocks, thrust bearings and roller bearings. The entire maintenance schedule is recorded through highly inherent data entry screens such as Roll Chock Maintenance Wizard. The features of this maintenance process are:
- Intuitive screens based on chock and bearing engineering diagrams.
- Detailed recording of condition and dimensional checks.
- Recording of chock and bearing damage histories.
- Schedule component maintenance on basis of usage rather than time.
- Bearing performance analysis by type.
