hpt 2022 #4

materials & tools
μ-milling cutter –
for high-precision requirements in mould making
Mould making plays a key role in many industries.
Mould makers place high demands on cutting tools –
after all, they are a key component in ensuring product
quality. This is why Gühring presented a new milling
cutter range for high-precision finishing requirements
at AMB 2022.
The combination of new geometry, adapted coating system
and ultra-hard substrate makes the high-precision milling
cutters so successful when used in hardened tool steel.
Maximum angular and fit accuracy
Whether plastic, metal, glass or chocolate – moulding is what
turns raw materials into products. Because these moulds produce
the surfaces of the finished components, maximum precision
is required here: only a perfectly manufactured mould
can produce a final product with tolerances and surfaces that
meet the required quality without reworking. For perfect part
quality, mould makers rely on tools that guarantee process reliability,
precision and repeatability. The Swabian tool manu -
facturer Gühring meets precisely these requirements with
a new range of high-precision milling cutters: the μ-precise
solid carbide milling cutters have a stable core geometry and
an optimised flute profile. Both reduce displacement during
milling and ensure stability which is reflected in a very high
contour accuracy. This makes the tools suitable for finishing
high-precision fits and guides with exact angular accuracy.
Safe chip removal during the milling process was another
focus during tool development as a basic requirement for
good surfaces. The structural dimensions and neck transition
geometries of the new milling cutters have therefore been
optimised for use in deep and narrow contours. All micro
With the new G-mold μ tool range all milling
processes in mould making can be covered
milling cutters in the new range also consist of revolver
blanks with GühroJet periphery cooling. With this innovative
technology for internal cooling, chips are removed directly
and safely from the machining zone by air, minimum
quantity lubrication (MQL) or cooling lubricant.
Harder substrate, extremely smooth layer
Because tool and mould making involves machining highstrength
and hardened steels, Gühring has adapted its carbide
substrate to these materials with the new high-precision
milling cutters: the cutting material is now around 200 HV
harder and finer-grained. This ultra-hard solid carbide substrate
guarantees very good edge stability and thus processreliable
service life in hard machining. The precision blanks
also have optimised shaft tolerances in the h5 range and are
μ-precise in diameter, concentricity and roundness. The radius
tolerances are even in the range of +- 5 μm. The coating system
has also been specially adapted for mould making: a
Perrox coating produced using the HiPiMS process makes
the tool surfaces extremely smooth and therefore very resistant
to wear. Thanks to this combination of carbide, coating
and geometry, the new high-precision milling cutters promise
a significant increase in performance – both in soft and harder
materials up to 65 HRC and even in high-alloyed or powder
metallurgically manufactured tool steels.
Every milling application covered
With its new G-Mold μ tool range, Gühring can now cover
all milling processes in mould making. The solid carbide
full-radius milling cutter “G-Mold μ65 B”and the highprecision
torus cutter “G-Mold μ65 T” are perfect for copy
milling and finishing of moulds and mould inserts made of
hardened steel up to 65 HRC. The cylindrical high-precision
finishing cutters “G-Mold μ65 F” for hardened workpieces
and “G- Mold μ48 F” for soft workpieces enable the optimal
angular accuracy and exact fits when finishing guides and
pockets in moulding plates. The new μ-precise micro milling
cutter “MikroMill μ55 U”meets high demands in the micro
range: very high-quality surfaces can be achieved with
the tightest tolerances and precise concentricity. An FEMoptimised
radius angle transition also ensures maximum
radial rigidity and low displacement during micro-milling.
The innovative GühroJet internal cooling increases the
service life of the tool and ensures process reliability.
The new range offers a high degree of flexibility with over
350 different dimensions, a wide range of full or corner
radii as well as corner chamfers and different versions for
hard and soft materials. Because quality counts above all in
addition to quantity, the tool manufacturer has invested specifically
in specialised production and measuring technologies
at its site in Germany – for tools that customers in tool
and mould making can rely on.
further information: www.guehring.com
no. 4, November 2022
21