Quality Requirements for Flying Shear Blades

Flying shear blades, as a critical industrial cutting component, have strict quality requirements.

1、 Material quality

hardness

Flying scissors blades need to have sufficient hardness, which is the key to ensuring that they can smoothly cut into the material being sheared. For cutting blades made of harder materials such as steel strips and thick cardboard, their hardness usually needs to reach around HRC (Rockwell hardness) 58-62. Only by achieving such hardness can the blade maintain its sharpness during long-term cutting work, effectively cutting materials without curling or deforming the blade edge.

toughness

High resilience is equally indispensable. During high-speed cutting, flying scissors blades have to withstand enormous impact forces. If the toughness is insufficient, the blade is easily broken. A good flying scissor blade should be able to withstand frequent shear impacts without damage. For example, when cutting high-speed moving metal wires, the blade may have to withstand multiple impacts per second, and only a blade with good toughness can work stably. Generally, steel containing alloying elements is used to enhance toughness, such as adding molybdenum (Mo) and vanadium (V) to refine grain size and improve the toughness of the steel.

Wear resistance

Due to the frequent contact and shearing of flying shear blades with materials, their wear resistance is crucial. Blades with poor wear resistance will wear out quickly, causing the cutting edge to become dull and affecting the cutting quality. High quality blade materials can resist friction and wear of materials, extending the service life of blades. For enterprises engaged in continuous production operations, this can reduce production costs and improve production efficiency.

2、 Dimensional accuracy

Blade flatness and straightness

The flatness of the blade directly affects the cutting quality. If the blade is not smooth, it will cause uneven material cuts during cutting, resulting in burrs or wavy cuts. For high-precision flying shear applications, such as cutting processes in electronic materials or precision mechanical parts processing, the straightness error of the blade is usually required to be controlled within a very small range, possibly only a few micrometers. This is the only way to ensure that the material size after cutting is accurate and meets the production process requirements.

Blade thickness and length accuracy

The thickness and length of the blade also need to be strictly controlled. The accuracy of thickness affects the installation of blades and the distribution of shear forces. If the thickness is uneven, it may not fit tightly with the blade shaft during installation, causing the blade to shake during operation and affecting shear stability. The length accuracy is related to the fit between blades and the control of material length. In a flying shear, inaccurate blade length may result in a deviation in cutting length, which cannot meet the fixed length requirements of the product.

3、 Surface quality

Roughness control

The surface roughness of flying scissor blades should be maintained within an appropriate range. A smoother surface can reduce the friction between the material and the blade, lower energy loss during shearing, and help improve the lifespan of the blade. A rough surface can increase friction, leading to increased blade wear and potentially causing quality issues such as surface scratches during the shearing process. Usually, the surface roughness Ra (arithmetic mean deviation of contour) of the blade should be controlled between 0.8-1.6 μ m.

Surface integrity

The surface of the blade should be free of defects such as cracks and sand holes. These defects may become stress concentration points during the shearing process, leading to premature damage of the blade. In the manufacturing process of blades, strict quality inspection methods such as non-destructive testing are required to ensure the integrity of the surface.