![]() Dormer's comprehensive range is available with different surface finish options including Bright and Titanium Nitride (TiN). Manufactured from premium grade High Speed Cobalt (HSS-E), all are designed to support high performance thread production in a wide range of materials, and can be specified with an optional oil groove to ensure lubrication supply to the working edge.Īs with other tooling applications, coatings continue to play a major part in the development and increased productivity of fluteless tap applications. To enable companies to take full advantage of thread forming, Dormer has a comprehensive programme of forming taps. Also, as thread forming does not produce chips there is no need to clear away swarf making the threading process more efficient and productive.” “The fact that the same tap can be used for threading both through and blind holes increases their versatility yet further. ![]() Johan Bodin, Dormer's threading R&D manager, explains: “Our forming taps provide accurate thread production across a wide range of materials including steels, stainless, non-ferrous metals and aluminium. As a result, higher cutting speeds are recommended for forming taps than for the corresponding cutting taps in the same material. Tests have shown the process of thread forming increases not only the yield strength of the thread but also its surface finish, hardness and wear resistance. Subsequently, there is no need to periodically back out the tap to clear away swarf which, with a cutting tap, can jam and break the tap resulting in costly machine downtime and component rework as the broken tap will need to be removed – often using an EDM drill. Of course one of the key differences between this process and thread cutting is that it doesn't produce chips. Because the material is compressed and its grain redirected rather than cut or interrupted, strength at the thread flanks and root is increased. The lead taper produces the thread profile, gradually flowing material from the thread crests along the thread flanks and into the minor diameter area. These lobes spaced periodically around the tap carry out the forming process, creating the thread as the tool is advanced into the material. These include: speed, as cold forming is faster than ordinary thread cutting a longer tool life, and as cold forming taps have a stable design there is a lower risk of breakage one type of tool can be used in a range of different materials and for both through and blind holes threads are guaranteed to the correct tolerance stronger thread (higher stripping strength) compared to threads obtained by cutting no chips and a lower surface roughness on the thread.įundamentally a cutting tap without the flutes, various designs of fluteless taps exist, but all essentially follow the same basic concept – a thread is ground onto a blank with a specific geometry which introduces forming lobes at the same time, or, conversely, the cylindrical thread is relieved at various positions around the circumference to leave the forming lobes. There are several significant advantages of using this method compared with cutting taps. Threading with fluteless taps – also known as cold forming or roll tapping – involves the creation of a thread by forming the material rather than cutting it like other taps. However, there is an alternative method that although not new, remains a relatively unexploited resource that offers significant benefits over the traditional methods. Here, Dormer Tools highlights the benefits of thread forming for manufacturing businesses.Īlthough there are many ways of creating threads, probably the most commonly accepted is by cutting the workpiece material with a thread cutting tap (internal) or die (external).
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