• Cut-off Knife

Fasteners have become an integral part of everyday life. Typical fasteners include screws, bolts, nuts, and washers that come in a wide variety of shapes. Fasteners are generally made from coiled wire or round bar stock made of cold upsetting steel, alloy steel, copper alloys such as brass and bronze, aluminum alloys, titanium alloys, and nickel-based alloys. The cut-off tool of the cold heading machine consists of a cut-off matrix and a cut-off knife. The cutting knife is used to obtain a precisely measured workpiece.

Proper cut-off of blanks in the heading machine is a critical operation since blank mass equals the mass of the finished part. During fastener-making production, after the wire has been successfully drawn to size, it enters the inside of the cold heading machine. It then goes through a cut-off die and continues until it reaches a wire stop. At this point, a cut-off knife moves across the wire, cutting it off to a specific length. This is also referred to as the cut-off slug.

A specific length of wire is cut off from a coil of wire prior to going into the heading die. Cut-off knife application

Drawing No.1 Cut-off Knife Drawing Drawing No.2 Cut-off Knife Drawing Drawing No.3 Cut-off Knife Drawing

Steel Part for Cut-off Knives:

Material Hardness (HRC) Features Applications
S45C 25-64 S45C is high-quality carbon structural steel at an affordable price, with good overall mechanical properties. Used for nuts, screws, shear dies, cut-off knives and thread rolling flat dies, etc.
SKD11 58-61 SKD11 tool steel has good wear resistance and size ability after heat treatment. Used for tensile dies, cold extrusion dies, first punch holder, etc.
SKD61 43-53 SKD61 steel is a high-grade die-casting die. It has heat shock resistance, heat deformation resistance, heat fatigue resistance. Used for heat work dies, cold heading dies, and second punch holders.

Carbide Part for Cut-off Knives:

Grade WC+Other Co Grain Size Density Hardness TRS
(±0.5%) (±0.5%) (g/cm³) (HRA)±0.5 (N/mm²)
VA80 80 20 Coarse 13.58 84 280

Benefit

  • Improved efficiency: The use of a cutting knife ensures that steel wire is cut to precise lengths, resulting in uniform and consistent products, reducing waste and improving productivity.
  • Low maintenance: Working parts of the cutting knife are made from high-quality tungsten carbide, ensuring their longevity and reliability. This leads to requiring minimal maintenance, reducing downtime and maintenance costs.
  • Customizable: Cutting knives can be designed to cut wire of different diameters and lengths, making them suitable for a range of cold heading applications. This increases production flexibility and efficiency.

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