Hardinge builds super-precision machines which are specifically designed to
achieve extremely low tolerances and high surface finishes. The machine
design allows for bringing the part closer to the spindle which is
particularly beneficial in hard turning.
Our machines offer a particularly high level of stability & precision, excellent vibration-absorbing characteristics, extremely high rigidity of the tool holders, and perfect stability of the workholding facilities. SUPER-PRECISION hard turning by Hardinge opens up new opportunities to replace expensive and complex grinding processes without any loss in quality. Hard turning is faster, more flexible, needs shorter setup times, and requires less operations.
Where precision and power count, machines and clamping technology of Hardinge are the first choice - where other manufacturers fails we are only warming up.
The Hardinge T series Super
Precision® sets new standards in high-precision machining - You achieve
excellent results no matter whether turning in two axes or producing highly
complex workpieces. The T series has been developed and designed to meet even
the highest demands and combines the entire technical know-how of the Hardinge
Group - the true global player in terms of CNC lathes for the manufacture of
The Hardinge CONQUEST H51
sets new standards in machining – as either a Chucker- or Bar-Machine - from
Hardturning to Universal Turning through to high volume production.
The CONQUEST H51 meets all your requirements for precision turning and incorporates the entire technical Know How of the Hardinge Group in terms of CNC-Lathes.
3 Controlsystems are available:
The lathes of the GT series are
machines of the latest generation, especially designed for high-precision
manufacturing. The GT 27 SP with linear tool carriage and comprehensive optional
components allows for individually configuring the system and matching it to
your specific requirements and demands. With the GT 27 SP Turn/Grind, you easily
turn & grind in one setup. Optionally, 3 high-frequency spindles with hybrid
bearings are available. The CHNC with one tool turret is offered for bar
capacities of 27mm and 42 mm.
The GS series by Hardinge includes
excellent horizontal turning centers meeting even the highest requirements and
demands. Each single machine convinces with outstanding features and
characteristics in terms of performance, accuracy and stability. Another
advantage is the enormous flexibility supporting the most versatile machining
cycles in production. The GS series stands for concistently high performance and
exceptionally long machine lives.
Compact and powerful CNC heavy-duty
turning centers with Hardinge collet spindle, tailstock (option) and NSK V
roller guideways in all axes. The optionally available Performance Plus package
comprising glass scales in X and Y axis, main spindle cooling unit and heat
exchanger at the hydraulic system paves the way for efficient hard machining.
The collet spindle allows for the series production of workpieces offering an
excellent surface finish within close tolerances.
Whether machining standard workpieces or high-quality stamping or casting
molds or complex components - this series has the perfect machining center
in store for each application. The Bridgeport XR series meets the highest
precision requirements for the aerospace industry, automative engineering as
well as mold & die making, and is perfectly suited for the machining of
materials made from special alloys like Titanium and Nimonic. All machines
of the XR series are prepared for 4-axis machining, while rotary table and
interface are available as options.
The GX series by Bridgeport
includes a variety of vertical machining centers. Each single machine convinces
with outstanding features and characteristics in terms of performance,
concistently high accuracy and absolute stability & rigidity. Another advantage
of this series lies in its flexibililty and the comprehensive range of optional
components. This allows for covering the most versatile production tasks and
achieving optimum machining results.
Hard turning and high-precision turning with Hardinge opens up new opportunities to replace expensive and complex grinding processes without any loss in quality. Hard turning and high-precision turning is faster, more flexible, needs shorter setup times, and requires less operations. And best of all: Hard turning and high-precision turning on a SUPER-PRECISION machine by Hardinge resembles machining on a cylindrical grinding machine in many respects. If you are in need of precision and power, opt for machines and clamping technology by Hardinge. Where others call it quits, Hardinge is just about to warm up:
In order to fully utilizes the hard turning and high-precision turning potential, established grinding processes should not simply be substituted. Instead, the process chain should be adapted to the new procedure. What is more: Successful hard turning and high-precision turning are based on an overall system. For it to function properly, the individual parts of the systems must be designed appropriately.
The wide design of the guideways of Hardinge machines typically offer a 40% to 60% higher performance and capacity compared to similar machines. The wide distance of the linear guideways forms a solid basis to absorb the generated cutting forces. The linear guideways are lapped and therefore grant absolutely minimal motion resistance. As a rule, the true running of the spindle exceeds the values specified in our documentation by 30% to 40%.
Further measurements reveal similar results. Again, the accuracy clearly surpasses the requirements. Among others, this is due to:
Digital glass scales in the X & Z & Y axis
All Hardinge T machines dispose of a highly rigid gray cast iron bed. In addition, this bed is filled with Harcrete polymer concrete in the critical areas - below the guideways and above the leveling feet. Harcrete is a synthetic granite and perfectly suited for absorbing vibrations. Thus, the basic structure of the machine alone guarantees successful hard turning and high-precision turning. The effects:
Concentricity is one of the main requirements! The Hardinge collet spindle ensures that the part is located as close as possible to the spindle bearings - the point of the highest stability and precision. In particular, this has a positive effect on the hard turning process and distinguishes Hardinge from other competitors. The farther away the part if from the spindle bearings, the worse becomes the spindle run-out, i.e. the concentricity at the turned part grows more and more.
Hardinge convinces customers as one of the world's largest manufacturer of workholding equipment for lathes. The clamping means are especially designed for the Hardinge collet spindles - without any compromise - and ensure optimum workholding solutions for all machining tasks thanks to their high versatility.
A decisive factor for the hard turning result and the process optimization is the use of the correct cutting tool materials. CBN (cubic boron nitride) is the material most frequently used for hard turning processes. CBN is available in various grades and quality classes. Selection is made depending on insert, material, hardness, interrupted cut, etc. However, despite its hardness, CBN often tends to be brittle. Tools with negative rake angle offer the strongest support for the cutting edge and should be selected whenever possible.
Experience shows, that tools with larger cutting radii score better surface finishes than those with small radii.
The general feasibility analysis of workpieces for which the conventional grinding process is to be changed to a hard turning process shows for the individual workpieces whether the combination of grinding and hard turning is beneficial.
Take for instance the hard turning of HSK workpieces the clamping diameter of which ranges between 5 and 12 mm and the length/diameter ratio of which exceeds the factor 3 as an example.
In this case, hard turning is restricted by physical limitations as unfavorable L/D ratios cause vibrations during hard machining processes . Therefore, this task would perfectly be suited for combined hard turning & grinding. This involves hard turning the workpiece and additionally grinding the hole so that the workpiece may be finished in one setup.