Thread Forming

Thread forming is a consistent solution for realizing the internal thread. The swarf remains the biggest opponent when cutting the thread and its evacuation, especially in deep threads and threads with counter-bore, is challenging. With the thread forming tap, the material will not be cut but formed. Thanks to the deforming process, the forming tap avoids creating swarfs or chips and guarantees a high process security with impressive performances.

RANGE OF APPLICATION

All materials with a minimum of 10 % elongation and a tensile strength of up to 1’150 N/mm2, e.g. steels, stainless steels, pure titanium, aluminium, copper, long chipping brass, etc.

FORMING PROCESS

The polished points and flats of the thread former’s teeth pierce the ductile material and force the material into the space in the tool profi le. This creates the thread profile with its typical groove in the crest.

ADVANTAGES

Higher process security due to the lack of shavings.
Only one tool for both, through and blind holes.
Optimal for deep threads.
Thread with higher resistance of stripping by static and dynamic load.

APPLICATION RESTRICTION

For physical reasons, thread forming in thin-walled work pieces should be carried out with due care.

ADEQUATE LUBRICATION

The thread forming process generates considerable friction. Therefore the tool must be protected by a film of lubricant. If the supply of lubricant is interrupted, then cold welding will quickly occur, resulting in tool failure.

		LUBRICATION GROOVES FROM Ø 3 MM Lubricant will be guided to the surface of the tool which is directly in contact with the material.				WITHOUT LUBRICATION GROOVES Especially recommended for forming soft materials and for through holes in thin parts (e.g. sheet metal work).
		WITH INTERNAL COOLANT SUPPLY Highly recommended for deeper threads and for horizontal working.				CORRECT THREAD PROFILE Accurate core hole is required in order to form a thread according to the norm. For materials with a very high elongation coefficient and threading depth > 2 x D, we recommend increasing the core hole Ø by 0.02 to 0.05 mm.
		INCORRECT THREAD PROFILE Too big profile due to the too small core hole diameter. The required torque is higher. Incomplete profile caused by the core hole diameter being too big.