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Thread tools \ Technical introduction – thread forming

Lubrication and cooling during thread forming

Process:
In contrast to tapping, where sections are cut out of the material, thread forming is a non-cutting, pressure forming procedure.
Advantages:
ƒ No chip formation
ƒ Up to 30% higher surface quality than with thread cutting
ƒ Up to 40% higher processing speed than with thread cutting
ƒ Threads in through holes and blind holes can be produced with the same tool
ƒ Wide range of materials processable
ƒ Cutting of thread eliminated
ƒ Thread pitch and thread angle errors as with cut threads eliminated
ƒ Shaped threads have higher strength owing to non-continuous cut
Requirements: For all shapeable materials with elongation >10 %.

in thread forming, the main job of the coolant is lubrication. the more lubrication is used with the highest
possible grease content, the longer the service life. we distinguish between the following coolants: 2
non water-soluble coolants
these are mineral oils with the best lubricating properties. they minimise friction and thus increase the
service life.
water-soluble coolants
can be emulsified with water. the grease content of these coolants should be no lower than 6%. the ideal
grease content is over 12%.
① coolant grease content ② service life ③ friction 3
1 6% 8% 8% 9% 10% 12% 20% 50% 100%

h For more detailed information and explanations, refer to the technical manual.
Cutting materials in thread forming

Process:
In contrast to tapping, where sections are cut out of the material, thread forming is a non-cutting, pressure forming procedure.
Advantages:
ƒ No chip formation
ƒ Up to 30% higher surface quality than with thread cutting
ƒ Up to 40% higher processing speed than with thread cutting
ƒ Threads in through holes and blind holes can be produced with the same tool
ƒ Wide range of materials processable
ƒ Cutting of thread eliminated
ƒ Thread pitch and thread angle errors as with cut threads eliminated
ƒ Shaped threads have higher strength owing to non-continuous cut
Requirements: For all shapeable materials with elongation >10 %.
Selecting the correct cutting material in thread forming depends strongly on the machine conditions and 1
the quantity to be manufactured. The cutting materials HSSE and HSSE-PM are used in the small to medium
quantity range or with unstable machine conditions. In large-scale series production, it is more economical VHM
to use solid carbide thread formers.
① Stable ② Unstable ③ Service life/procurement costs HSSE-
PM

HSSE

2
3
h For more detailed information and explanations, refer to the technical manual.

Source: Hahn+Kolb Werkzeuge GmbH
Technical data subject to change. www.iconridge.com
Availability subject to country specific rules and regulations. 129

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