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.
Drawing No.1 Drawing No.2
Drawing No.3
Steel Part for Cut-off Knives:
Carbide Part for Cut-off Knives:
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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