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Process Thread Rolling


Thread and Profile Rolling belong to the chipless forming procedure. This technology is used for producing threads, worm gears and serrations on the outside of a round work piece which is axially symmetric. On the sur- face of the work piece a certain profile will be formed.

This is an extremely efficient chip - less forming process saving steel because of the absence of chips on the one hand. On the other hand you will receive an increase in the surface hardness . Based on the uninterrupted structure in the cold formed material you will receive a work piece of in- creased tensile strength.


Process/Application

Through-Feed System with 2 tools


Application:
Standard threads, special threads, knurling, ball screws etc. medium to high accuracy

Production rate: 1 to 60 m / min
Work piece sizes: M2 upt to M 300 in standard
or high tensile steel length up to 6000 mm



Example:




ACME Thread
Feeder High Grade Steel: 42CrMo4, Tr 30x6 DIN 103

Piece length 3.000 mm
Production: 600 mm / min.



In-feed System with 2 tools




Application:
Standard threads, special threads, knurling and serrations with medium to high accuracy
Production rates: 1 up to 300 Teile / min
Workpiece sizes: M2 bis M 300 in standard
or high tensile steel
length of the thread/serration = width of the tool




Example: clamp bolt for wind power plants
High Grade Steel: 20mn B 4 Cr 8 (10,9) ca. 900 N / mm 2 tensile strength
M 45 pitch 5 mm, Production: 150 Parts / Hour.





Examples for valves
High temprature metal: Inconel bis 1.800 N / mm 2 tensile strength
Setting of the shaft, Production: 1.400 parts / hour





Progression of force during the chipless forming of threads:






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