Historically, internal threads were formed by "cutting" taps. These tools are designed to remove material from the hole to form a finished internal thread in the desired geometry. These tools use a feature called chamfer to achieve a gradual cutting action when the tap enters the hole, and use the groove to make room for chips generated by the cutting action, and use tools or lubricants to help cut and remove materials from the groove.
Fkrdrill recommends the use of "Fkrtaps", and our goal is to thread as many materials as possible.
Cutting the bushing formed by the fkrdrill tool with a cutting tap will weaken the connection.
Formwork can be used for cold formed good materials. This includes steel, stainless steel, light metals, light metal alloys and other tensile strengths up to 1200 N/mm ² Materials. Generally, the material that produces continuous chips during drilling is a good candidate for thread forming.
Forming taps create thread by displacement of material within the hole.
The formed material assumes the shape of the thread form of the tap without the creation of chips. Some features of the cutting tap like chamfer, are altered to address the forces required to cause the material being threaded to
assume a new form.
Tap Lands separated by flutes are replaced by high areas called lobes.
These lobes are relieved to reduce surface contact with the work material. Friction reduction is a major objective in successfully forming threads.
Thread Cutting
FormtappingForming taps require a slightly larger hole, as the material being threaded flows into, as well as away from, the threads of the tap. The finished minor diameter of the hole will be smaller than the unthreaded hole when the process is complete.
It is universally accepted that formed threads are stronger than cut threads and have a smooth, burnished surface finish.
Cold forming taps can also be operated at higher speeds and feeds than conventional taps.
The non-cutting cold working process has an extreme compacting effect on the material, particularly at the root and crest of the thread form and does not fracture the material’s
grain structure.
Thread Cutting
FkrtappingThis procedure is particularly suitable with Formdrill for the production of threaded connections. The result is that the structure of the thin-walled bushing is very strongly consolidated and a high quality thread is ensured.