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  • Offer Profile
  • No matter whether high-performance system for the individual production or price-conscious performance for simpler tasks. Hardinge offers turning centers for any requirement. We are where our customers expect first-class solutions in matters of accuracy, quality, individuality and service. Our location in Krefeld lay all the foundations to achieve just that.
Product Portfolio
  • Turning centers for Hard turning and high-precision turning

  • 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 T-Series, CNC-High-Precision- Workholding Equipement

      • 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 high-accuracy workpieces.

        Key features:
        • Perfectly suited for Hard Turning & Milling
        • Spindle concentricity < 0.7µ
        • Variation at workpiece < 3µ
        • Repeatability of axes < 0,76µ
        • Hardinge collet spindle
        • High spindle speeds
        • High rapid traverse rates of up to 38 m/min
        • Fast indexing times of turret < 1 sec
        • High chip removal capacity
        • 45° fully cast machine bed, filled with HARCRETE® polymer concrete
        • Hardinge collet spindle as motor spindle
        • Heavy-duty type linear guideways for X axis and Z axis
        • Preloaded ball screws - guaranteed for long life and consistent high precision
        • FEA (Finite Element Analysis) for dynamic and thermal stability
      • The Conquest H51, CNC-High-Precision Lathes

      • 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.

        Key features:
        • Perfectly suited for Hard Turning
        • Usable as Chuck- and Bar Machine
        • Spindle concentricity 0,5µ (only SP-Machine)
        • Variation at workpiece < 5µ
        • Repeatability of axes 0,76µ
        • Hardinge Collet ReadySpindle (Option CFS-Spindel for SpannTop + TopPlus)
        • High spindle speed 5,000 min-1
        • Fast indexing times of turret < 1,45 Sek.
        • One-piece, 45 degree slant bed design
        • Hardinge Spannzangenspindel (Option CFS-Spindel for SpannTop + TopPlus)
        • Heavy-duty type linear guideways
        • Preloaded ball screws - guaranteed for Long life and
        • consistent high precision

        3 Controlsystems are available:

        • Siemens 840 D Solution Line
        • Mitsubishi M720V
        • Fanuc Oi-TD
      • The GT series, CNC High-Precision Lathes

      • 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.

        Key features:
        • Perfectly suited for hard turning & milling
        • Spindle concentricity 5C < 0.4µ
        • Spindle concentricity 16 C < 0.7µ
        • Variation at workpiece < 3µ
        • Repeatability of axes < 1.2µ
        • High spindle speeds
        • HARDINGE collet spindle
        • High rapid traverse rates
        • 2 grinding spindles (optional)
        • Max. speed of grinding spindle – 80,000 rpm
        • Component Probe Systems available
        • Machine bed made from Hardinge Harcrete®
        • Linear guideways designed for heavy-duty operations
        • Preloaded ballscrews for a long life and consistently high precision
        • FEA (Finite Element Analysis) for dynamic and thermal stability
        • High-frequency spindle with hybrid bearings (option)


         

      • The GS series, CNC Horizontal Lathes

      • 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.

        Key features:
        • Shorter cycle times and reduced non-productive times
        • High spindle speeds
        • Rapide traverse rates of up to 30 m/min in X axis & Z axis
        • Short tool change time of the turret head
        • High chip removal capacity
        • Longer tool lives and increased efficiency particularly in high-speed machining
        • Inclined bed cast in one piece reinforced with additional ribs
        • FEA (Finite Element Analysis) for dynamic and thermal stability
        • Preloaded C2 ballscrews for low-noise operation and minimum thermal expansion
        • Heavy-duty linear guideways with 6-fold ball bearings boost rigidity by 30% and significantly extend the machine life
      • GS 42 / GS 51 / GS 65 CNC Horizontal Lathes

      • 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.

        Key features:
        • High precision
        • High series accuracy
        • Compact design
        • Long life
        • Flexibility thanks to various options like for instance
        • Performance Plus package (thermal stabilization)
        • Tailstock
        • C axis for contour milling
        • Rotary tools in all stations
        • Gantry loading system, machine-integrated
        • Automatic tool and part measurement
        • Control: Fanuc Oi-TD or Siemens 828 D
        • Performance Plus thermal stabilization Package comprising glass scales in X and Z axis, main spindle cooling unit and heat exchanger for hydraulic system

        The Hardinge collets are directly inserted in the main spindle. This results in a minimum projection of the workpiece beyond the spindle bearings. One of the most important prerequisites for the spindle to transmit the guaranteed runout of 0,5 µm to the workpiece. At the same time, the rigidity of the clamping system is increased. This creates ideal conditions for the observance of form and positional tolerances.
      • The XR series, Vertical Machining Centers

      • 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.

        Key features:
        • Rigid 'C-Frame' cast iron design for high stability and capacity
        • Generously dimensioned linear guideways for high rigidity and repeatability
        • Maximum positioning accuracy
        • Machine specifications pursuant to ISO 202-2
        • Thermal stability and optimum power transmission
        • FEA (Finite Element Analysis) for high rigidity and dynamic stability
        • Fast cycle times and low non-productive times
        • Best values in chip removal capacity
        • BIG-Plus spindle system
      • The GX series, Vertical Machining Centers

      • 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.

        Key features:
        • Fast cycle times and low non-productive times
        • Best values in chip removal capacity
        • Main spindle with 8,000 rpm (GX 600/1000)
        • Main spindle 10,000 min-1 (GX 1300/1600) included as standard
        • Rapid traverse rates in X & Y & Z axis 36 m/min
        • Long tool lives and optimized efficiency particularly in high-speed machining
        • FEA (Finite Element Analysis) for high rigidity and dynamic stability
        • Positioning accuracy pursuant to ISO 230-2
        • Linear guideways in all axes
        • Roller guideways in all axes (GX 1300/GX1600)
        • Low noise level, high thermal stability
        • High power transmission
        • 'C-Frame' design (incl. stationary column) with wide machine bed
    • Technology

    • WHO TURNS PRECISION, HITS THE TARGET FASTER AND FINISHES FIRST

      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:

      • < 3 µ continuous machining accuracy
      • 0.25 µ achievable part concentricity
      • RZ 1 achievable surface finish

      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.

        • High part stability

        • Most hardened parts may be hard turned with regard to their properties and condition, unless they are not sufficiently stable due to their length/diameter ratio. As rule of thumb, a length/diameter ratio of 4:1 with tailstock and of 6:1 without is assumed. In case if ID machining, the tool is the decisive factor. Not qualified for hard turning processes are parts which cannot withstand the cutting forces due to deficient inherent stability.
        • High machine stability & precision

        • 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%.

          • Spindle run-out: Specified with 0.000375 mm, actual values lie around 0.00015 to 0.00025 mm.
          • Positioning accuracy: Specified with 0.00125 mm, actual values lie around 0.0005 to 0.00075 mm.

          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

          • Chuck and collet seats are ground in their own bearings
          • Thermal shielding prevents "thermal growth"
          • Spindle motor and collet closing mechanism are dynamically balanced
          • Spindle pitch error compensation improves positioning accuracy with a resolution of 0.0001mm in the axes
        • High shock absorbtion

        • 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:

          • 60% less vibrations
          • Achievement of optimum grinding accuracies
          • Improved part tolerances
          • 30 % longer tool life - and more
          • Lower tooling costs
          • Less scrap and refinishing work
        • High tool holder stability

        • The in-house developed BMT45/55 tooling plate by Hardinge permits the use of live tools in all 12/16 turret stations. It comes equipped with a pin drive and special tool holders which allow for accommodating modular driven and static tools. The turret head may also be locked halfway at the station increasing the number of tool pockets to 24/32 which offers maximum flexibility and prevents restrictions in case of complex requirements through combined operational processes in one cycle. For the BMT 45 / 55 turret head plate, a great number of live tools is available; radial, axial and adjustable tool holders (+/- 90°), loadable in main and sub spindle, grant perfect machining results for all drilling and milling applications.
        • High workholding stability

        • 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.

        • High suitablity of the cutting tool materials

        • 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.

        • Combined processes - turning and grinding in one setup

        • 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.

      • Solutions

      • FIRST CLASS APPLICATIONS FOR THE MANUFACTURE OF INNOVATIVE AND TRENDSETTING PRODUCTS
          • Automotive - Hard processing of the gear wheel

          • All form- and position tolerances, surface finishes and fits must be observed..

            Advantages:

            Hard turning as an alternative to grinding.

            Results:
            • Surface finish quality < Ra 0,4 µ
            • Roundness  < 3µm
            • Shape and positional tolerances (axial runout and concentricity) <2µm
            • Concentricity  outer diameter zu Teilkreis < 10 µ (depending on component)

            Processing time: 4 minutes 20 seconds in total
            Material, hardness: 16 Mn Cr 5 , 58 ± 2, Eht = 0,7

            Process description:

            In the first setup, the gear was clamped in the pitch circle diameter of the gearing in order to guarantee the concentricity to this reference. In the second setup, a clamping mandrel was used. All faces were machined by roughing and finishing.

             

          • Medical instruments - Full workpiece processing

          • The critical feature is the general processing of the chromium molybdenum cobalt material and the high requirements for surface and shape accuracy. Advantages:

            Complete processing including rolling the surface using Ecoroll

            Results:
            • Roundness less than 2 µm
            • Shape accuracy less than 5 µm
            • Surface finish quality of less than Ra 0.3 µ

            Processing time: max. 17 minutes 30 seconds (depending on component)
            Material, hardness: CrMoCo

            Process description:

            For the various workpieces, both a bar and fixtures were used in order to clamp and process the castings accurately. All the processing was carried out with a roughing and a finishing pass.

          • Medical instruments - Full workpiece processing

          • The critical feature is the general processing of the chromium molybdenum cobalt material and the high requirements for surface and shape accuracy. Advantages:

            Complete processing

            Results:
            • Roundness less than 1 µm
            • Axial runout/concentricity less than 3 µm
            • Surface finish quality all less than Ra 0.4 µ

            Processing time: 7 minutes/7 minutes 15 seconds
            Material, hardness: CrMoCo

            Process description:

            The workpieces were produced from bar material. After completing the first side, the workpieces were transferred to the opposing spindle and the second operation was carried out. All the processing included roughing and finishing passes.

             

          • Aerospace - Full processing from a single casting

          • All the turning, milling and boring processes must be carried out in two setups. Advantages:

            Minimising the number of operations

            Results:
            • Roundness less than 2 µm
            • Axial runout and concentricity less than 3 µm
            • Surface finish quality of less than Ra 0.4 µ

            Processing time: 1 hour 30 minutes in total. There is significant variation between unprocessed parts
            Material, hardness: MSRR 6002 Forging

            Process description:

            The workpiece was produced in two clamping positions. The workpiece was positioned using the front face bores so that the bores on the second side could be processed with a high level of precision.

             

          • Aerospace - Complete processing of a workpiece

          • Advantages:

            Turning as an alternative to grinding.

            Results:
            • Surface finish quality less than Rz 4
            • Roundness less than 2 µm
            • Concentricity less than 4 µm
            • Plane parallelism of both flat surfaces less than 4 µm
            • Repeat accuracy on the part 4 µm

            Processing time: 4 minutes, 38 seconds
            Material, hardness: H 11, approx. 52 HRC

            Process description:

            In the first operation, the workpiece was clamped between a face driver main spindle and a centring device opposing spindle. The complete outer contour was created as a result of this operation. In the second operation, the eccentric was completed using a step chuck and an eccentric sleeve. Finally, the back of the workpiece was planed to the correct dimension.

          • Tools and moulds - Complete processing of a workpiece

          • The critical feature is the cone, as this has to be mounted onto another component with as little play as possible. Advantages:

            Hard turning as an alternative to grinding. Minimising the cycle time.

            Results:
            • Roundness less than 1 µm
            • Surface finish quality less than Rz 2
            • Concentricity defects less than 4 µm

            Processing time: Both operations 7 minutes in total
            Material, hardness: M340/50–54 HRC

            Process description:

            In the first clamping position, the outer diameter was turned. This also forms the reference diameter for clamping in the second position. In the second clamping position, the inside of the cone was turned, as well as the outer diameter. The surface on the outer diameter was milled as the last stage.

             

          • Tools and moulds - Processing the front cone of a workpiece

          • Advantages:

            Hard turning as an alternative to grinding. Minimising the cycle time.

            Results:
            • Roundness less than 1 µm
            • Surface finish quality less than Rz 2

            Processing time: 3 minutes 30 seconds
            Material, hardness: M340/54 HRC

            Process description:

            A bore was made into the hardened material while the workpiece was clamped with an overhang, and the centring was machined in order to support the workpiece accurately. The complete outer contour and the groove were produced.

          • Tools and moulds - Precision hard turning of the outer contour

          • The shape accuracy of the contour is the critical feature
            Advantages:

            Hard turning as an alternative to grinding.

            Results:
            • All turned surfaces less than Ra 0.23
            • High shape accuracy of the turned outer contour < 2 µ

            Processing time: 45 minutes
            Material, hardness: 1.2327-VE 2% Cr — special cold-rolled steel, 61–63 HR

            Process description:

            The workpiece was clamped using a clamping cone. The clamping position was supported by the opposing spindle. Right and left steel holders were used for the outer contour. The contour was produced using a roughing and a finishing pass.

          • Tools and moulds - Meeting shape and positional tolerances and a surface finish quality of Rz 4

          • Advantages:

            Minimising the number of operations

            Results:
            • Roundness below 1.3 µm
            • Axial runout below 1.2 µm
            • Concentricity bore to flat surface of the second clamping position less than 5 µm

            Processing time: 12 minutes
            Material, hardness: 1.2080, 60 + 1 HRC

            Process description:

            The workpiece was clamped in the bore in the first operation using the clamping mandrel. The outer diameter was turned, the workpiece was planed, and the cone to the bore was drilled out. In the second operation, the workpiece was clamped on the outside, planed to the correct dimensions, and the inner contour was completed together with its thread.

          • Hydraulics and pneumatics - Fully processing of the piston

          • Fit, shape and positional tolerances must be met. The surface finish quality must be less than Rz 1.6 Advantages:

            Minimising the number of operations.

            Results:
            • Roundness less than 0.8 µm
            • Cylinder shape less than 4 µm
            • Coaxiality less than 4 µm
            • Concentricity less than 3 µm
            • Surface finish quality less than Rz 0.8 µm

            Processing time: 2 minutes 30 seconds
            Material, hardness: 16 Mn Cr 5, 60 HRC

            Process description:

            The workpieces were clamped between spikes; the outer diameter was roughed and finished. The groove was produced, then the Baublies diamond smoothing tool was used. The aim was to achieve a contact ratio of 50–70% on the surface.

             

          • Hydraulics and pneumatics - Sealing surfaces must be machined on both workpieces

          • The critical features are their shape accuracy and surface finish quality. Advantages:

            Minimising the number of operations, reducing the cycle time.

            Results:
            • Roundness < 1 µm
            • Surface finish quality < Rz 2
            • Shape accuracy < 5 µ

            Processing time: Part #1: 26 seconds; part #2: 32 seconds
            Material, hardness: Part #1: steel 1957/04STD 1119,57; part #2: 15 Cr Ni 6

            Process description:

            The workpieces were clamped using clamping jaws. Processing was carried out with roughing and finishing passes.

             

          • Hydraulics and pneumatics - Complete processing with transfer from the opposing spindle to the main spindle

          • Cycle time of 4 min. 20 sec. must be achieved. Shape and positional tolerances as well as all fits must be met. Surface finish qualities of Rz 10 and Rz 16 must be achieved Advantages:

            Complete processing including gear hobbing as main feature

            Results:
            • All turned surfaces less than Rz 8
            • Concentricity less than 30 µm
            • Repeat accuracy on the workpiece amounted to 5 µm

            Processing time: 4 minutes 20 seconds
            Material, hardness: 1.4104 (X14CrMoS17)

            Process description:

            The outer contour was first created on the opposing spindle. The inner contour was first drilled out and completed with a finishing pass. After transferring to the main spindle, the gear hobbing was created using roughing and finishing passes. Both rear fits (outer and inner) were completed with a finishing pass.

             

          • Hydraulics and pneumatics - Process development of a valve seat

          • Meeting all shape and positional tolerances, surface finish qualities and fits. Advantages:

            Hard turning as an alternative to grinding.

            Results:
            • Sealing seat 1 µm round
            • Surface finish quality < Rz 0.8
            • Repeat accuracy on the part 2 µm

            Processing time: 1 minutes 8 seconds
            Material, hardness: 16MnCrS5 58 + 4HRC

            Process description:

            The workpiece was clamped in an extended 16C clamping jaw. First the bore 5.8 H7 was roughed and finished. The bore diameter and sealing seat were created as the last step.

             

          • Tool holder - Complete processing of an ER32 clamping jaw spindle

          • Advantages:

            Hard turning as an alternative to grinding. Minimising the cycle time.

            Results:
            • Surface finish quality < Ra 0.3 µm

            Processing time: 4 minutes 30 seconds
            Material, hardness: 16 Mn Cr 5, 58 +4 HRC

            Process description:

            Turning of the clamping jaw spindle in 2 clamping positions. Outer fits, the cone and the M40 x 1.5 thread must be produced.

          • Tool holder - Complete processing of the tool spindle

          • All shape and positional tolerances, surface finish qualities and fits must be met. Advantages:

            Hard turning as an alternative to grinding

            Results:
            • Surface finish quality less than Ra 0.4 µ
            • Roundness outer less than 3 µm
            • Shape and positional tolerances (axial runout and concentricity) less than 1.5 µm

            Processing time: 5 minutes 38 seconds
            Material, hardness: 16 Mn Cr 5 Pb, 58 ± 2, Eht = 0.4

            Process description:

            Turning of the tool spindle between spikes; a polygon was milled on the main spindle side so that this could be used as a carrier. In the second clamping position, the inner contour and the flat surface of the tool spindle were produced.

             

          • Measurement technology - Process development of a spindle

          • All shape and positional tolerances, surface finish qualities and fits must be met. Advantages:

            Turning as an alternative to grinding.

            Results:
            • Surface finish quality less than Rz 2.8
            • Roundness less than 1.2 µm
            • Concentricity less than 4 µm
            • Repeat accuracy on the part 4 µm

            Processing time: 1 minutes 33 seconds
            Material, hardness: 1.0401 (C15)

            Process description:

            The workpiece was clamped using 16C clamping jaws; the available centring was machined with an overhang.  Next the workpiece was turned using a centring device on all the diameters with a single finishing pass.

          • Machinery manufacture - Process development of a gearbox pinion

          • Which must be fully turned in just one clamping position

            Advantages:

            Minimising the number of operations and their cycle time. Hard turning as an alternative to grinding.

            Results:
            • Surface finish quality achieved < Ra 0.2 µ
            • Roundness < 2 µm

            Processing time: 2 minutes
            Material, hardness: 16 Mn Cr 5/60 +/- 2

            Process description:

            The workpiece was clamped between spikes. The flat surface, outer diameter and the thread were processed fully. A diameter described as twist-free was processed using rollers.

             

          • Machinery manufacture - Complete processing from bar material with main and opposing spindle machining

          • The bore under 6° is the critical feature. Advantages:

            Minimising the number of processes in two setups.

            Results:
            • Surface finish quality less than Rz 4
            • Roundness less than 2 µm
            • Concentricity less than 4 µm
            • Plane parallelism of both flat surfaces less than 4 µm
            • Repeat accuracy on the part 4 µm

            Processing time: 4 minutes 38 seconds
            Material, hardness: Bronze (soft turning)

            Process description:

            Using extended 16C clamping jaws, the bar material was clamped to the main spindle. After all the boring, milling and turning processes had been completed, the part was transferred to the opposing spindle. Here the workpiece was planed to the correct dimensions, and all the necessary phases were turned.

             

          • Packaging industry - The workpiece needs to be processed on the bore and outer contour, including grooves

          • The inner processing is carried out using a grinding spindle

            Advantages:

            Minimising the number of operations

            Results:
            • Roundness < 2 µm
            • Axial runout of front surface < 1 µm
            • Surface finish quality < Rz 2
            • Repeat accuracy in the process < 3 µ

            Processing time: 9 minutes 35 seconds
            Material, hardness: 1.2379 HRC 62 HRC

            Process description:

            The workpiece was clamped onto a magnetic disc using an adapter plate. The outer and inner contours were completed using roughing and finishing passes.

             

          • Ball bearings - Complete processing of a ball bearing

          • Shape and positional tolerances must be met. Advantages:

            Minimising the number of operations.

            Results:
            • Roundness outer < 1 µm
            • Cylinder shape bore < 2 µm
            • Concentricity outer to flat surface < 2.5 µm
            • Roundness inner < 1.2 µm
            • Coaxiality < 3 µm
            • Surface finish quality < Rz 1.6 µm

            Processing time: 13 minutes (machining allowance 1 mm)
            Material, hardness: 100 Cr 6, 700–740 VPN

            Process description:

            Workpiece clamping using magnetic chucks, in order to be able to fully turn the outer and inner contour in one clamping position.

             

          • Ball bearings -The cylinder rollers must be processed on the flat surfaces and the outer contour

          • The critical features are the concentricity, axial runout of both front surfaces and the roundness of the workpiece. Advantages

            Hard turning as an alternative to grinding, reduced throughput time.

            Results:
            • Concentricity < 2 µ
            • Roundness < 0.6 µm
            • Axial runout of front surfaces < 2 µm
            • Surface finish quality all < Rz 2

            Processing time: 2–4 minutes (depending on size)
            Material, hardness: 1.3520/1.3537/1.3536, 60 +2 HRC

            Process description:

            The workpiece was clamped between spikes (main and opposing spindle with clamping jaws, stamp material) and all the operations (roughing and finishing steps on all operations) were completed in this clamping position.