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KL-TECH s.r.o. | www.klte.cz
Optimization
of knurling
The pitch corresponds
to the workpiece
circumference In many cases the user does not notice the relationship between the pitch and
the workpiece circumference, since the pitch already corresponds to the workpiece
circumference.
The knurling wheel can compensate the distortion of the pitch to produce good
knurling (see Figure 1).
The pitch does not
optimally correspond
to the workpiece
circumference The more unfavourable the pitch corresponds to the workpiece circumference, the
more the knurling wheel has to compensate. This results in knurling of poor quality
and reduces the tool life.
Effects on the knurling quality:
„ „ Form knurling:
The less favourable forming process (unnecessary strain on the material) results in
a rough surface and reduced tool life. The sub-optimal penetration process causes
material abrasion, which is formed into the knurling profile (indistinct profile flanks).
This results in distortions of the knurling profile, which are evident in flattening of the
profile and rounding of the tooth crest and tooth gullet (see Figure 2).
„ „ Cut knurling:
The sub-optimal penetration process of the knurling wheel results in indistinct profile
flanks (shadowing). This results in distortions of the knurling profile, which are evident
in flattening of the knurling profile and rounding of the tooth crest and tooth gullet
(see Figure 2).
The pitch does not
correspond to the work-
piece circumference
This is an extreme case. The knurling wheel cannot compensate the unfavourable
relationship between the pitch and the workpiece circumference, or the profile is
heavily distorted.
In the worst case this can result in “double knurling”. The knurling wheel then no
longer engages in the knurling profile after one workpiece rotation, but instead
engages between the profile.
This is evident in the finer pitch of the knurling (see Figure 3).
Figure 1:
Optimal knurling profile
p = pitch
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Figure 2:
Distorted knurling profile
Figure 3:
Double knurling