Cold Saw Blades
– Cold saw blades are categorized into two types: solid HSS or tungsten carbide-tipped (TCT).
– Both types of blades are resharpenable and can be used multiple times.
– Cold saw blades have a relatively slow rotational speed and a high chip load per tooth.
– They are driven by a high power motor and high-torque gear reduction unit or an AC vector drive.
– The metal is released in a shearing action by the teeth as the blade turns and the feed mechanism moves the blade forward.
– Solid HSS cold saw blades are made from M2 or M35 tool steel alloyed with cobalt.
– They are heat treated and hardened to 64/65 HRC for ferrous cutting applications and 58/60 HRC for non-ferrous cutting applications.
– HSS blades have high resistance to heat and wear but are brittle and not resistant to shock.
– Tensioned raw material is required to produce high-quality HSS cold saw blades.
– TCT cold saw blades have an alloy steel body with tungsten carbide inserts brazed to the tips of the teeth.
Portable Saws
– Portable cold saws were primarily designed for sheet metal roofers in the building industry.
– They can cut up to 6mm (0.24in) thick mild steel.
– Cold saws are used to avoid damaging protective coatings.
– They have a heavy-duty aluminum catcher for capturing the swarf.
– Portable saws use cermet tipped blades.
Advantages of Cold Saws
– Cold saws produce minimal burr, fewer sparks, less discoloration, and no dust.
– Saws with a flood coolant system can eliminate sparks and discoloration.
– The type and number of teeth, cutting speed, and feed rate must be appropriate for the material being cut.
– The material being cut must be mechanically clamped to prevent movement during cutting.
– Cold saws are capable of machining most ferrous and non-ferrous alloys.
References
– Dunn, Michael (2019-11-28). The 11 Best Cold Cut Metal Saws 2023 Review. Retrieved 2023-07-02.
– ‘Do A Lot of Cutting Through Steel? Get One of These Best Chop Saws.’ Popular Mechanics. 2022-07-12. Retrieved 2023-07-02.
– M2 HSS Cold Saw Blades – Cold Saw Blade Store. Retrieved 2023-07-02.
– Heinemann Saw. www.heinemannsaw.com. Retrieved 2023-07-02.
– Digest, Team Tool (2020-06-04). Best Cold Saws 2022: For a Smooth Finish – Tool Digest. Retrieved 2023-07-02.
Miscellaneous
– Cold saws with a flood coolant system can eliminate sparks and discoloration.
– The type and number of teeth, cutting speed, and feed rate must be appropriate for the material being cut.
– The material being cut must be mechanically clamped to prevent movement during cutting. Source: https://en.wikipedia.org/wiki/Cold_saw
A cold saw is a circular saw designed to cut metal which uses a toothed blade to transfer the heat generated by cutting to the chips created by the saw blade, allowing both the blade and material being cut to remain cool. This is in contrast to an abrasive saw, which abrades the metal and generates a great deal of heat absorbed by the material being cut and saw blade.
As metals expand when heated, abrasive cutting causes both the material being cut and blade to expand, resulting in increased effort to produce a cut and potential binding. This produces more heat through friction, resulting in increased blade wear and greater energy consumption.
Cold saws use either a solid high-speed steel (HSS) or tungsten carbide-tipped, resharpenable circular saw blade. They are equipped with an electric motor and often a gear reduction unit to reduce the saw blade's rotational speed while maintaining constant torque. This allows the HSS saw blade to feed at a constant rate with a very high chip load per tooth.
Cold saws are capable of machining most ferrous and non-ferrous alloys. Additional advantages include minimal burr production, fewer sparks, less discoloration and no dust. Saws designed to employ a flood coolant system to keep saw blade teeth cooled and lubricated may reduce sparks and discoloration completely. Saw blade type and number of teeth, cutting speed, and feed rate all must be appropriate to the type and size of material being cut, which must be mechanically clamped to prevent movement during the cutting process.
