What Causes The Barrel-Shaped Deformation Of The Plate Rolling Machine?

The plate rolling machine is a piece of equipment suitable for many different occasions. However, during the use of the equipment, due to improper use, it is likely to cause barrel deformation of the equipment, resulting in a decrease in the efficiency of the equipment. In order to solve this problem, Once there is a problem, the next step is to understand the cause of the problem.

During the working process of the plate rolling machine, the upper roller presses down and the rollers on both sides rotate, causing the plate to continuously bend around the upper roller, thereby achieving the purpose of rolling out a cylinder with the required radius.

According to the structural form of the plate rolling machine, we can analyze the stress of each roller during the working process as a tube support beam. Generally speaking, the upper roller of the plate rolling machine is thicker and has better rigidity, while the lower roller is slightly thinner and less rigid than the upper roller. If the downward pressure of the upper roller is too large when rolling the plate, and the rigidity of the measuring roller is insufficient, the roller will deform and deflect during the rolling process of the cylinder.

For plate rolling machines with longer rollers (for example, more than 5m), the rollers are more likely to undergo such deformation when the pressing force and rolling force are close to the upper limit of the equipment. This makes the gap size along the length direction between the upper and lower rollers of the plate bending machine inconsistent. The gap in the middle part is too large and the gap at both ends is small, resulting in a situation where the pressing force on the plate at both ends of the roller is large and the pressing force in the middle is small. That is, when rolling the cylinder, the plate on the same layer along the length of the roller is Uneven stress and inconsistent stress and strain at each point cause the bending radius of the middle part of the rolled cylinder to become larger and form a barrel shape. For medium and thin plates with the same material properties, when the plate thickness is the same as the rolled cylinder diameter and the plate width The larger the size or the thickness of the plate is the same as the width of the plate and the diameter of the rolled cylinder is smaller, the greater the pressing force and rolling force required, and the greater the deflection caused by the roller deformation.

Therefore, the difference in force at each point along the length of the roller axis is greater, and the barrel deformation is more obvious. If the width of the sheet exceeds 5mm during the roll (usually some cylinders where the plates are welded first and then rolled) and the rolled diameter is relatively small (such as less than ~1000mm), the rolled cylinder will There will be obvious barrel deformation.

The above are the reasons for the barrel-shaped deformation of the plate rolling machine. Based on the understanding of the causes and other aspects, the equipment can be better used and the user can achieve satisfactory results.