The Sickle Bend Defect Often Occurs in The Cutting Of Disc Shears, Which Affects The Final Surface Quality Of The Product. The Reason Is:

The sickle bend defect often occurs in the cutting of disc shears, which affects the final surface quality of the product. The reason is:

1. Excessive use of cutting blades

1. When overuse or not turning the blade, the cutting blade will be dull and inconsistent in sharpness, which will cause the steel plate to shift the cutting centerline during the cutting process, causing the sickle to bend.

2. The consistency of the cutting blade diameter is poor. As the number of shear increases, the shear blade will wear out, and the moving side and the fixed side shear blade will wear deviation, but when the sheer speed changes, the steel plate will deviate to the side with the smaller shear blade diameter, resulting in a sickle bend.

Second, the synchronization of the pinch roller

When the crown of the pinch roll or the parallelism of the equipment assembly changes, or the pressure difference of the pinch roll is too large, the rise and fall are not synchronized, which can also cause the deviation of the shear center during the shearing process of the steel plate, resulting in a sickle bend.

Third, the positioning accuracy problem

With the continuous increase of the shearing volume, various mechanical gaps of the equipment exceed the design level, and deviations in the feedback data of the position detection and positioning system will affect the quality of the shearing and positioning.

The corresponding countermeasures are:

1. Establish a synchronous replacement mechanism for cutting blades

According to the amount of steel plate shearing and the state of use of the cutting blade, the moving and fixed sides of the cutting blade of the disc cutter and the edge cutting shear must be replaced or turned over simultaneously to prevent the inconsistency of the shear force caused by the different wear conditions of the cutting blade. Sickle bend.

2. Optimize and adjust the pinch roller

The diameter of the transfer side and the fixed side of the inlet and outlet pinch rollers are kept the same. At the same time, the pressure difference of the pinch rollers is reduced by adjusting the proportional valve in the hydraulic control system to ensure that the pinch rollers are raised and lowered synchronously during the lifting and lowering process to ensure that the steel plate is always on the roll. The center of the road ensures the cutting parallelism.

3. Adjust the knife seam value

However, when the plate shape appears in a barrel shape, the vertical slit value is appropriately increased to increase the force of the upper shearing blade on the plate edge, reduce the degree of freedom of the narrower side of the head in the chute, and make it run down the chute as much as possible to reduce The sickle bends.

4. Improve positioning accuracy

When the expected position of the disc shears differs greatly from the actual position, the speed of the disc shears traverse motor is given a larger value as an exponential function; when the difference is small, a smaller speed is given to reduce the mechanical traverse inertia and increase The accuracy of positioning avoids the sickle bend caused by the problem of the control system.