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What are the applications of flat-edged round knives in the metalworking industry
Flat edge round knife (flat edge round knife) is the core cutting tool for metal coil/sheet processing, with the core advantages of rotary cutting, flat cutting surface, and high efficiency. It is widely used in metal coil longitudinal cutting, sheet cutting, precision slitting, and edge trimming scenarios.Sources：www.kmjjw.cn | PublishDate：2026.03.16
1、 Core application scenarios
1. Longitudinal cutting and slitting of metal coil (the most mainstream)
Applicable materials: cold-rolled/hot-rolled steel coils, stainless steel coils, aluminum coils, copper coils, galvanized sheets, tinplate, silicon steel sheets, etc.
Processing method: Used in pairs (upper blade+lower blade), the wide coil is continuously cut into narrow strips by rolling shear.
Typical products: Transformer silicon steel sheet, motor iron core strip, metal packaging strip, narrow strip for automotive stamping, electronic shielding copper/aluminum foil.
Advantages: Smooth and burr free cutting surface, high precision (tolerance ± 0.01mm), fast speed (up to 300m/min), and high material utilization rate.
2. Edge trimming and width determination of metal sheet/strip
Usage: Cutting burrs on sheet/strip, controlling width tolerances, removing oxide scale or defect layers.
Application: Pre processing of sheet metal processing, sizing of stamping blanks, and edge shaping of precision strip materials.
3. Precision slitting of thin metal foil/metal strip
Applicable: Aluminum foil, copper foil, nickel strip, stainless steel foil (thickness 0.01-1mm).
Fields: Lithium battery electrodes, capacitor electrodes, heat dissipation foils, shielding materials, electronic lead frames.
Characteristics: High roundness, dynamic balance, and sharp edge are required to avoid tearing and wrinkling of the foil material.
4. Cutting and cutting of metal pipes/profiles
Method: The rotary flat mouth circular knife is used in conjunction with a pipe cutting machine to perform chip free or micro chip cutting on thin-walled metal pipes (copper, aluminum, stainless steel, welded pipes).
Advantages: Smooth incision, no deformation, higher efficiency than sawing, suitable for large-scale pipe processing.
5. Rolling cutting and marking of metal sheets
Roll cutting: Continuous cutting of thin steel plates and aluminum plates, replacing traditional shearing machines, suitable for large-sized plates.
Marking/creasing: Press crease lines on the surface of metal plates for subsequent bending and forming (such as chassis, cabinets, and home appliance casings).
6. Recycling and cutting of metal waste
Purpose: Cut metal scraps, waste coils, and waste sheets into small pieces for easy recycling and remelting.
Features: Wear resistant, impact resistant, suitable for high-strength scrap steel, stainless steel, etc.
2、 Application advantages
Good cutting quality: The flat mouth design makes the cutting surface straight, without burrs or collapsed edges, reducing subsequent polishing/deburring processes.
High efficiency: Continuous rotary shearing, with a speed far exceeding that of reciprocating cutting tools, suitable for high-speed production lines.
High precision: dynamic balance of the blade body+precision grinding, small cutting width tolerance, suitable for precision metal strip.
Strong universality: can adapt to metal materials of different thicknesses (0.01-5mm) and materials.
Long lifespan: Hard alloy/coated flat round knives are wear-resistant, with low tool changing frequency and less downtime.