Operating Manual
Tangential Rolling System T18F - T27F
14
4.3 The thread rolls
A set of thread rolls is required for each thread size. A set consists of 2 different thread
rolls. They are labeled with the numbers 1 and 2.
Depending on the rolling head size and the thread size the thread rolls are either
constructed with a single or multiple thread design. In principle, the largest number of
starts on the roll Z and thus also the largest possible roll diameter D
r
should be aimed
for in order to consider the largest possible shoulder diameter at the workpiece.
The thread rolls for the thread tolerance 6g (for threads as per DIN), 7e (for trapezoid
threads) and 2A (for UN threads) are delivered by default. A lot of other thread toler-
ances are also possible.
4.3.1 Tool life
The tool life of the thread rolls is dependent on many factors. This includes, e. g.:
■ Material properties (especially tensile strength and breaking elongation)
■ Hardening behavior of the material during cold forming
■ Profile rolling degree
■ Type of chamfers during workpiece preparation
■ Correct adjustment of the tool
■ Rolling speed and working feed
■ Sufficient supply of clean coolant
■ Avoidance of chips on workpieces and thread rolls prior to the rolling process
Depending on the application it can make sense to use thread rolls with a special
design (e. g. from another roll material) instead of thread rolls with a standard design.
Contact LMT Fette for more information (see Chapter 13).
After the thread rolls have become worn they will need to be replaced with new ones;
see Chapter 5.1.2 for more information
LMT_Bedienungsanleitung_T18F_T27F_e.indd 14 02.08.11 17:40
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