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Functions and Types of Flying Shears in Steel Rolling Mills
Release date:
2021-01-01
The Use and Classification of Flying Shears in Steel Rolling Mills A shear machine used to transversely cut moving rolled stock is called a flying shear. With the advancement of continuous plate mills, structural steel mills, and billet mills, coupled with the increasing productivity of flying shears, their applications have become increasingly widespread. Flying shears come in a wide variety of types and are widely used: disc-type flying shears, dual-drum flying shears, crank-rotary flying shears, and swing-type flying shears, among others.
Steel rolling mill The Use and Classification of Flying Shears
A shear machine used for horizontally shearing and moving rolled stock is called a flying shear. With the advancements in continuous plate mills, structural steel mills, and billet mills, as well as the increasing productivity of flying shears, their applications have become increasingly widespread.
Flying shears come in a wide variety of types and are widely used: including disc flying shears, dual-drum flying shears, crank-rotary flying shears, and swing-type flying shears, among others.
1. Disc flying shears—this type of flying shear is typically used for small-scale applications. Steel rolling mill Workshop. It’s installed either before the cooling bed to perform rough cutting of the rolled products, ensuring they don’t spend too long waiting to enter the bed, or positioned upstream of the finishing mill to trim the head end of the rolls, thereby maintaining a smooth rolling process in the finishing mill. The flying shear consists of two or more pairs of disc-shaped blades, with the axes of the discs aligned precisely with the speed at which the steel moves. When the flying shear is in its initial position, the steel advances along the inlet guide into the left side of the shear mechanism. As the steel contacts the flag switch or light beam sensor, the guide and the steel momentarily deflect to the right, allowing the material to pass between the two rotating discs for cutting. After the lower blade descends, the guide directs the steel back to its original left-hand position, after which the lower blade rises again. One drawback of this type of flying shear is that the cut edges are slightly angled—but this doesn’t significantly affect the head-end trimming or rough-cutting operations performed before the cooling bed.
2. Continuous Steel Plate Slitting Line Steel rolling mill Sometimes, the workshop uses a pendulum-type flying shear. In this type of flying shear, the blades also move in a translational motion, resulting in higher-quality cutting of the steel plates. The blade holder is fixed to a swinging frame, which is supported by an eccentric shaft. The shaft features two pairs of eccentrics—another pair of eccentrics is connected via a connecting rod to the lower blade holder, allowing the lower blade holder to slide within grooves on the swinging frame. Because the two pairs of eccentrics on the shaft are positioned 180 degrees apart, as the shaft rotates, the upper blade holder moves downward while the lower blade holder rises simultaneously, completing the shearing action. However, this mechanism can only cut stationary rolled materials. To shear moving materials, the swinging frame must be made to oscillate back and forth. At the bottom of the swinging frame, an eccentric rod is hinged, and an eccentric wheel is mounted on the rear axle. This rear axle is connected to the main shaft through a small pinion gear, a rack, and a synchronous disc. When the main shaft rotates, the swinging frame pivots forward and backward around the main shaft via the synchronous disc, rack, pinion gear, and eccentric connecting rod attached to the rear axle. As a result, the blade holders undergo a translational motion, enabling the pendulum-type flying shear to perform its cutting operation effectively.
Although Steel rolling mill The role of the middle shear machine isn't critical, but it plays a vital part in ensuring the precision and shape of the finished product. Different types of Steel rolling mill The appropriate flying shear should be selected to ensure the entire production line achieves the target dimensions and precision.
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