![]() The material is pushed to the side by the edges (pressure studs) and formed into a thread. A prerequisite is the good cold formability of the material. With the thread former (tap) internal threads are produced chiplessly by cold forming. Tap with internal cooling (suitable for deep tapped holes) Tap with lubrication groove (The lubrication groove improves the contact between tap and workpiece surface) Thread formers without lubrication groove (suitable for thin and soft materials) Thread formers and thread formers come in different designs: Which different thread formers are available? Tap with a TiN coating (titanium nitride coating).This is because thread formers, like taps, can also be surface finished. The material in which a thread can be formed depends, among other things, on the surface treatment of the tap. Nevertheless, a tap is suitable for both through holes and blind holes. This can sometimes be the case with blind holes. Thread formers are particularly suitable when no chips are desired. Which materials and materials can be shaped? P = Thread pitch in mm Core hole dimension table for thread formersĬore hole dimension table for thread formers former: D K = D Nominal diameter – (0,5 × P) + 0,05ĭ K= Nominal diameter of the thread (thread former or tap).The mathematical derivation for determining the correct core hole diameter (D K) for tapping as well as thread formers is: Differences and comparison: former and tapping You can find more information on this in the core hole dimension table for thread formers below. This is because the core hole dimension is calculated differently than when tapping. ![]() While you need a smaller core hole when tapping, you have to make sure that the core hole is larger when tapping. However, the decisive difference between the two methods is in the detail. ![]() To form a thread you have to pre-drill a core hole, similar to tapping. The forming pockets are then formed during thread forming. ![]() What exactly is cold forming in thread forming?Ĭold forming is the forming of metals at a temperature well below the recrystallisation temperature, which results in an increase in strength and a reduction in elongation at break. Unfortunately thread forming is not suitable for all materials. The thread also has a higher thread strength. Thread forming does not destroy any material fibres and therefore provides a better surface structure of the tap. However, the tolerances of the drill hole are tighter and the applied torque is higher than with tapping. Thus, no chips are produced, the surface is smooth and the machining is fast and precise. In direct comparison to the tap, the tap has a longer service life. The prerequisite is the good cold formability of the material. With the thread former (also called a tap drill) internal threads are produced without cutting by cold forming. In this blog post we will deal with: What is a thread former / thread grooving? What exactly is cold forming in a tap? Which materials and materials can be formed? What are thread formers with and without lubrication grooves? Is there a difference between core holes for tapping and core holes for thread forming? You can find more methods for thread production here: Methods of making threads. ![]() There are different methods to produce a thread (milling, forming, drilling, rolling…etc.) Thread forming or thread grooving is one of many methods. ![]()
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