Slitting machine blades and rotary shear blades typically refer to two sets of circular disc-shaped tools, which achieve longitudinal slitting of metal sheets and strips through interlocking rotation. They are widely used in metallurgy, automotive, home appliance, and packaging industries, allowing wide metal coils to be slit into narrow strips of different widths to meet the needs of subsequent processing, such as cutting car body panels and manufacturing home appliance casings.
Material Selection
High-alloy tool steel: such as Cr12MoV and H13. These steels, after heat treatment, have high hardness, good toughness, and excellent wear resistance and fatigue resistance. They can be used for slitting materials with high hardness or requiring high wear resistance, such as stainless steel and silicon steel sheets.
High-speed steel: such as W18Cr4V and W6Mo5Cr4V2. These steels have good red hardness, maintaining the sharpness and hardness of the cutting edge during high-speed cutting. They are suitable for applications requiring high precision and high speed, such as the slitting of precision metal foils.
Cemented carbide: It has extremely high hardness, excellent wear resistance and corrosion resistance. It is often used for slitting materials with high hardness and wear resistance. For example, cemented carbide blades can be used for slitting thin stainless steel sheets and aluminum foil, especially when extremely high demands are placed on slitting quality and blade life.
Structural Features
The blades are usually disc-shaped, consisting of the blade body and inner hole. The inner hole is used for mounting with the blade shaft. The dimensional accuracy of the inner hole and the clearance with the blade shaft are controlled within a very small range to ensure the stability and concentricity of the blade during high-speed rotation.
To adjust the spacing between the blades and the gap between the upper and lower blades, spacers and rubber gaskets are usually provided. The thickness of the spacers is selected according to the required slitting width. The commonly used thickness range is between 0.8-200mm, and their hardness is generally above HRC45 to prevent scratching and damage.
Manufacturing Process
Forging: Forging can improve the internal microstructure of the steel, making it more dense and uniform, and improving the overall performance of the blade. Heat Treatment: Including processes such as quenching and tempering, this is a crucial step in ensuring the hardness, toughness, and wear resistance of the blades. For example, using vacuum quenching and low-temperature tempering can ensure uniform hardness of the blades, prevent oxidation and decarburization, and improve the service life of the blades.
Precision Machining: Through multiple processes such as rough turning, fine turning, grinding, and polishing, the outer diameter, thickness, flatness, and parallelism of the blades are precisely controlled to ensure cutting quality.
Installation and Usage Guidelines
Installation: Wear gloves during installation. First, install the lower blade on the blade shaft and tighten it, then install the upper blade. Be careful to prevent the blades from colliding. During installation, ensure that the blade and the blade shaft are tightly fitted without any looseness.
Blade Alignment: Press down both handwheels simultaneously. Stop pressing down when the upper and lower blades are about to touch. Then, adjust the upper blade shaft axially so that the upper blade engages with the lower blade groove to prevent blade chipping. After aligning the blades, continue rotating the handwheels to press down, ensuring the blades engage with moderate depth. After aligning the rotary blades, test cut with a strip of paper. If the paper can be cut smoothly, tighten the upper blade fastening bolts. If not, continue aligning the blades until the paper can be cut.
Usage: During the slitting process, the blade gap and cutting speed should be adjusted reasonably according to factors such as material thickness and type. At the same time, a good lubrication and cooling system should be used to reduce the temperature of the blades, reduce wear, and improve slitting quality and blade life.
Accept non-standard customization