DVSpezial_2019

58 NAXOS-DISKUS Schleifmittelwerke
DVS Tools & Components
59
In all areas of grinding technology,
there are path-controlled forming rollers
for dressing the abrasives used.
Changes in the production process are
very easy to implement by dressing
using the machine‘s own CNC control.
The application-related dressing costs
thus remain extremely low. The dressing
process can be carried out on all
common types of abrasives. The wide
range of application possibilities of
the forming rollers offered by NAXOS-
DISKUS is particularly convincing.
Grinding tools are subject to wear during
use. Due to the continuous grinding
process, the abrasive grains used become
increasingly dull. In addition to the loss of
shape and profile accuracy, this results in
a considerably lower cutting performance
with a longer grinding and cycle time.
Furthermore, increased grinding forces
and the resulting high temperatures on
the workpiece are the result. In order to
counter these effects, it is essential to
sharpen grinding tools using a controlled
dressing process. This creates new sharp
grain edges. It restores the circumferential
profile and significantly increases the cutting
performance of the grinding tools.
This results in a reduction of the cutting
forces and the workpiece temperature in
the grinding process.
NAXOS-DISKUS now starts - in close cooperation
with the sister companies of the
DVS Technology Group - an advance into
this important segment of grinding technology.
The development and production
of form dressing rolls is based on 140 years
of experience in grinding technology. The
advantage for our customers:
• Low acquisition costs
• Greater flexibility, as the form dressing
rolls can be used largely independently
of the grinding wheel and workpiece
profiles.
• Lower forces in the dressing process.
The effective roughness depth of a grinding
tool is decisively influenced by the
dressing process. While a good cutting
performance and thus high effective using
roughness depths are advantageous in
roughing grinding, a rather lower effective
roughness depth is preferred in fine grinding
or in the finishing process with the aim
of achieving a high surface quality.
For dressing conventional as well as superabrasive
grinding tools, rotating diamond
and PCD dressing rolls are used in addition
to stationary dressing rolls, where a distinction
is made between profile and form
dressing rolls.
NAXOS-DISKUS distinguishes between
two different manufacturing processes for
the manufacture of form dressing rolls:
• The diamond grain, in the selected
shape and size, is galvanically scattered
by a special technology – in the positive
direct process – and sintered directly
onto the carrier body in a matrix.
• The carrier body is coated with polycrystalline
(PCD) or monocrystalline (MKD)
plates, which are applied to the carrier
body in a specially developed process.
Galvanically scattered dressing rolls are
mainly used for superabrasive CBN and
diamond grinding wheels, while dressing
rolls coated with platelets are mainly used
for conventional grinding wheels with
aluminium oxide and silicon carbide grain
types in ceramic bond.
The following geometries, among others,
are available for the assignment of PCD
MKD form dressing rolls. Half moons,
quarter moons and rectangles. The width
of the plates as well as their setting patterns
and setting distances can be variably
produced and arranged according to the
requirements of the respective grinding
process. The possibly necessary reworking
of the form dressing rolls for the dressing
process – in order to achieve the exact
profile with the required dimensional
tolerances – is carried out by a materialfriendly
finishing process using a specially
developed, high-precision laser technology.
The accuracy of the form dressing rolls
is influenced not only by the manufacture
of the high-precision carrier body, but also
by the choice of grain size and shape, with
the smallest tolerances for dimension and
form. The different types of coating result
from the respective dressing process required.
•
Author:
Norbert Knoedler
Sales Director
NAXOS-DISKUS Schleifmittelwerke GmbH