Thread Rolling Process

Thread and Profile Rolling belong to the chipless machining processes. This technology is used for producing threads, splines, grooves, worm gears and serrations on the outside of a round work piece which is axially symmetric. On the SURFACE of the work piece a certain profile will be formed.

This is an extremely efficient CHIPLESS 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 . The uninterrupted structure in the cold formed material increases the tensile strength of the work piece.

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

From High Grade Steel: 42CrMo4, Tr 30×6 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 rate: 1 up to 300 Parts / min

Work piece sizes: M2 to M300 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: