GRINDING & SURFACE FINISHING WHEELS IN MOTION
unique machining system to achieve
accuracy to DIN 2 levels and beyond.
Holroyd’s regional sales director Steven
Benn says: “The customer required a
machine capable of grinding a variety of
gears to exacting tolerances. Products to be
manufactured include spur and helical
gears; gears with end tip relief and root llet
radius; worm tooth forms such as ZA, ZI, ZK
and ZN; worms with sunken tooth forms;
and dual-lead forms with both cylindrical and
tapered roots. The GTG2 was selected for its
versatility, reliability and accuracy – the
latter achieved through high levels of onboard
machine intelligence and a machining
process developed to compensate for helical
twist.”
NEW TWIST ON PRODUCTION
Helical Twist occurs when helical gears are
‘lead crowned’ to improve meshing and
reduce noise and wear. Lead crowning varies
the amount of material removed from the
ank of a tooth, across the face width, by
causing the tool motion to deviate from a
true helix. The problem is that ‘in-form’
grinding has the undesirable effect of
causing the pro le of the tooth ank to vary
across the face. Particularly in high precision
and low noise applications, this variation
affects gear wheel performance by
concentrating loads on particular areas of
teeth during meshing.
The GTG2 machine corrects this problem
by calculating and controlling additional
motions of the grinding wheel during the
grinding operation using dedicated software
written by Holroyd engineers. In the
machining process, the workpiece is rotated
about its axis and the tool moved so as to
A large face width pinion
gear mounted on a Holroyd gear grinder
vary the angle of inclination of its axis
relative to the workpiece axis. As a result,
generation errors are reduced along each
line of instantaneous contact between the
tool envelope and groove surface being
machined. The outcome is better tooth
contact during meshing and improvements in
torque transfer ef ciency.
“Although the GTG2 is designed to
provide DIN 2 levels of accuracy, it has
Grinding & surface fi nishing industry news in brief
Following the acquisition of Hardinge Inc by Privet Fund
Management LLC during the summer of 2018, a restructuring of
the group is being implemented that has resulted in a number of
changes at the headquarters of its UK Jones & Shipman
Hardinge operations. The company has relocated from its
Leicester headquarters and factory to a new administration,
distribution and demonstration facility on the Europark at Clifton
Dunsmore, just outside Rugby. Furthermore, the group’s sister
grinding companies – Kellenberger, Hauser, Voumard, Tschudin
and Usach – now include the Hardinge identity and are
represented under the new Hardinge global umbrella website as
distinct brands. More details: https://is.gd/okiwic
Advanced Grinding Solutions (https://is.gd/noxulu) has
announced a partnership with Italian ltration system
manufacturer, Comat. The company manufactures super- ltration
systems that deliver 2-3 micron ltration quality, which is said
to make oil cleaner even than new unused oil. The lters are able
to achieve this level of performance throughout the entire working
cycle, while minimising the lifetime running costs of grinding
machines and maintaining maximum coolant consistency, it is
claimed.
GE certi cation for mass surface nishing has been gained by
Fintek (https://is.gd/wufopi). Adding to the company’s existing
AS9100 and AS9001 accreditations, the new certi cate is an
important milestone for the Fintek as the company continues to
expand its subcontract surface nishing services for the
aerospace sector. Fintek is engaged in pioneering work with
several aerospace component manufacturers working closely with
it to eliminate production bottlenecks where hand and traditional
surface nishing methods are not able to achieve high quality
requirements in short cycle times that are required.
Sunnen and Applied Nano Surfaces (ANS) of Sweden have
entered into a joint development programme that is focused on
the patented ANS ‘Triboconditioning’ process, which is designed
to reduce friction and wear on a variety of honed parts and
components. Triboconditioning is a combined mechanical/
chemical surface-treatment process that uses a machining
procedure to level off surface peaks and apply a friction- and
wear-reducing compound to the component surface. Unlike spray
coatings, the compound becomes an integrated part of the
component structure at a nano level. More details: https://is.gd/
ubovut
www.machinery.co.uk @MachineryTweets September 2019 65
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