The "folding" of a hacksaw blade refers to the proper way to store it during transportation, storage, or replacement. Because hacksaw blades have a certain degree of elasticity and rigidity, improper folding can easily lead to permanent deformation or even breakage.
For hand hacksaw blades, a common practice is to gently bend the blade into a large arc before coiling it multiple times for storage. Avoid forcibly bending it into a sharp angle at any point; instead, distribute the bend evenly along the entire length to reduce localized stress concentration. Typically, the blade is rolled into three to four loops and then secured with cable ties or rubber bands.
For machine band saw blades (such as those used in band saw machines), the folding method is more professional, commonly known as the "three-leaf fold." During operation, both hands control the blade to allow it to naturally rotate, forming three symmetrical loops stacked together under elasticity, resembling flower petals. This method compresses the long blade into a shape that is easy to carry and store without damaging the teeth.
It is important to note that regardless of the type of saw blade, it should never be folded at a right angle or subjected to forceful pressure, as this can lead to tooth breakage or metal fatigue. The correct folding technique involves "utilizing natural elasticity to create a large curvature bend," rather than forced deformation, thus extending the saw blade's lifespan.
