![]() ![]() The minor diameter of a formed thread is created by material displacement. ![]() Thread flank quality is uniform and size is very consistent. ![]() Thread surface finish is also good, improving resistance to corrosion and abrasion. The cold forming process redirects material grain orientation, resulting in thread flanks with higher surface tensile, yield, and shear strengths. The company says this is particularly important for self-reversing heads, because the torque output of a self-reversing head is limited by the size of its components, and cannot match the output of the machine itself.įormed threads are created by material displacement. Torque increases as the tap dulls, and the tap may continue to produce acceptable threads even after the torque required has doubled.īecause of the increased torque requirements, Tapmatic recommends reducing the acceptable tap capacity range for its tapping attachments by 25% when using forming taps. The company explains that thread forming requires more torque than cutting an equivalent thread in the same work material. They also work with tapping heads–either self-reversing or non-reversing–such as those manufactured by Tapmatic Corp. The forming tap, running at the same surface speed, spindle speed of 307 rpm, and feed of 460 mm/min, produced 6240 threads at a cost per hole of $0.01.įorming taps work with standard tapping heads, CNC machines, automatic screw machines, or leadscrew tappers. The cutting tap could produce an estimated 2281 threads at surface speed of 10 m/min, spindle speed of 322 rpm, and feed of 483 mm/min for a cost per hole of $0.02. In one example, the software was used to compare cost of producing a 15 mm deep, M10 thread in B226 aluminum casting alloy. By inputting the work material, thread parameters such as size and tolerances, the type of machine being used, and hole type, users can get a direct economic comparison between thread forming and cutting. Cost per threaded hole can be further reduced by a reduction in downtime normally created by chip problems, tap breakage, and frequent tool replacement.Įmuge offers a computer model service that compares expected performance of forming taps versus thread cutting. The result of higher speeds and longer tool life is higher production rates and lower costs.
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