COLD FORMING ROLL TAPS FOR THREAD ROLLING MACHINES

• Fluteless taps RH class selection
• Calculating Tap Drill Sizes for Forming Taps
• Selection of cutting fluid
• Tapping Speed Selection

Applications ot of chipless roll taps

Roll taps (fluteless taps, cold forming taps) are recommended to be used when producing threads by plastic deformation (rolling) in parts made of non-ferrous and ferrous metals with high plasticity. These materials include: aluminum and its alloys, copper, brass, bronze with a high copper content, zinc and its alloys, low-carbon and high-plastic stainless and heat-resistant steels. Compared to cutting taps, forming taps have greater strength, provide accurate threads with low surface roughness, and increase thread strength (up to 20%).

Their main difference from cutting taps is the absence of longitudinal grooves that form cutting edges. In addition, the champfer on these taps is significantly shorter. At the end of the threaded part of the fluteless taps, there are small symmetrically located coolant grooves.

Chipless roll taps are much stronger than regular taps, their breakages are very rare and there are almost no defects of parts due to taps breakdowns. Thanks to the long threaded part, the tap can be re-sharpened several times. Thus, the service life of the roll tap is much longer than cutting taps.

High productivity in threading is the main advantage of chipless roll taps. They are used for thread forming not only in through holes, but also in blind holes. The thread rolling profile is formed by pressing the tool into the workpiece material and extruding part of the material into the tool cavity.

Outlook & Drawing

(coarse and fine thread taps have the same shape)
G - Chamfer Length: 2 threads for blind holes (B) or 4 threads for through holes (P)
H - lubricating groove

Ordering of Roll Taps for Non-Ferrous Alloys with Long Thread