Understand the Relationship between Roll Gap and Curvature

The roll gap is the space between the rollers in a roll - bending machine. A smaller roll gap will result in a greater degree of bending of the LR/DH36 shipbuilding steel plate. The curvature of the plate is inversely proportional to the roll gap. As the roll gap decreases, the plate is forced to conform more closely to the shape of the rollers, increasing its curvature.

 

Trial - and - Error Adjustment during the Process

After the initial roll - gap setting, a trial - and - error approach is often necessary. Roll the steel plate through the rollers at a slow speed for the first pass. Observe the actual curvature of the plate after the first pass. If the curvature is less than the desired value, reduce the roll gap slightly for the next pass. Conversely, if the curvature is greater than expected, increase the roll gap. The adjustment amount can be based on experience or a more precise calculation considering the elastic - plastic behavior of the steel. For example, if the curvature is found to be 10% less than the desired value after the first pass, the roll gap can be reduced by a certain percentage (such as 5 - 10%) for the second pass, depending on the specific characteristics of the equipment and the material.

 

 

 

 

 

 

Product Name	Shipbuilding steel plate
Surface	Skin Pass
Certificate	ISO 9001:2008/SGS/BV
Shape	Plate. Coil
Material	EH36

 

Use of Measuring Tools and Feedback Systems

To ensure the accuracy of the plate curvature, it is essential to use measuring tools during the roll - bending process. Laser - based or mechanical profilometers can be used to measure the actual curvature of the plate in real - time. These measurements can be fed back to the control system of the roll - bending machine. Based on the feedback, the roll gap can be automatically adjusted to achieve the desired curvature. For example, if the measured curvature deviates from the target value by a certain tolerance (e.g., ±5mm in the radius of curvature), the control system can calculate the necessary roll - gap adjustment and implement it immediately.

Account for Material Spring - back

LR/DH36 shipbuilding steel plate has a property called spring - back. After the plate is bent, it will tend to return slightly to its original shape due to the release of internal elastic stresses. When adjusting the roll gap, this spring - back effect must be considered. The roll gap can be set slightly smaller than what would be expected without considering spring - back to compensate for this effect. The amount of spring - back can vary depending on factors such as the material's yield strength, the degree of bending, and the plate thickness. Empirical data or finite - element - analysis - based simulations can be used to estimate the spring - back and make appropriate adjustments to the roll gap.

 

 

 

 

 

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