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TURNING APPLICATIONS


 

Turning of crankshaft frb schema 1633/99

CRANKSHAFT – SCHEMA FRB 1633/99


1633-99_ing

 

  • MACHINING: Roughing turning and finishing ends flywheel side and timing side.
  • REQUIRED QUALITY
    • Tolerance: 0,1 mm on main diameters.
    • Concentricity: 0,05 mm.
  • ORIGINAL CYCLE
    • Centering facing.
    • Turning flywheel side end.
    • Turning timing side end
  • TECNOLOGIE FRB CYCLE
    • Centering facing.
    • Turning flywheel side and timing side.

RESULTS:

  • FRB cycle, because of elimination of one operation, permits e reduction of 22,5″ to machine the workpiece due to load/unload, acceleration and stop of the chuck. Consequently, to machine 1.400 shafts/day it can be necessary 3 lathes instead of 4 with better efficiency because each lathe machines the whole workpiece.
  • TOOLING: The workpiece is machined in one operation with driving on end of flywheel side and longitudinal reference on fixed center. During roughing, thrust on live center is 1.000 Kg. and 800 Kg. on driving pins; during finishing thrusts are reduced respectively to 500 Kg. and 400 Kg. The tailstock sleeve is locked during working cycles and it is provided with MT5.
  • QUALITATIVE IMPROVEMENTS: Improvements are present both on concentricity and on dimensions, obtained with the self-compensating face driver only, so that errors due to double positioning of original cycle and to radial efforts originated by self-compensating chuck and self centering chuck are eliminated.

 

Turning arm bridge scheme frb 1670/99

BACK ARM AXLE – FRB SCHEMA 1670/99


BACK ARM AXLE – FRB SCHEMA 1670/99

 

  • WORKED MODELS: Three models, with a max. lenght of 980 mm- crown thickness 6 mm.
  • MACHINING: Rough turning and finishing of ends and machining intermediate brake support.
  • REQUIRED QUALITY
    • Tolerance: 0,03 mm on principal diameters.
    • Roughness: 1,6 Ra.
    • Concentricity: 0,04 mm.
    • Roundness: 0,006 mm on Ø of driving on box.
    • Cilindricity: 0,014 mm.
  • MACHINING CYCLE UNTIL 1996
    • Turning driving side end.
    • Turning opposite side with working brake support.
    • Grinding Ø driving side.
  • PRESENT MACHINING CYCLE WITH FRB FACE DRIVERS (SINCE 1997)
    • Rough/finishing turning of end with working brake support.

FACE DRIVER FEATURES:

  • TYPE 45/120 SPECIAL FLANGED WITH POINT OPERATED BY SPRINGS
  • TECNOLOGIE FRB have chosen this type of face driver (point by spring) to permit centering of the workpiece on internal chamfer without causing radial deformations in the driving area (required roundness 0,006 mm). The workpiece is driven by 4 self-compensating driving pins that drive on a crown of 1,5 mm., with a thrust of the live center of 800 Kg.unta di 800 Kg.
  • CONCLUSION: with only one operation it is possible to make roughing and finishing with degree of finess a sgrinding on both parts because, through this system, it is possible to obtain the roundness required in grinding, in turning also with considerable reduction of the overall machining time..

 

Turning of left back wheel stub axle frb schema 2000/00

LEFT BACK WHEEL STUB AXLE – SCHEMA FRB 2000/00


LEFT BACK WHEEL STUB AXLE – SCHEMA FRB 2000/00

  • MACHINING: Rough turning and complete finishing.
  • REQUIRED QUALITY
    • on Ø 29,99 : Cilindricity 0,006 mm.
    • tolerance 0,018 mm.
    • roughness 1,2 Ra
    • ORIGINAL TOOLING
    • Rotation of the workpiece and dead centers.
    • Driving with 3 sector chuck.
    • Two lathes have been overhauled and equipped with FRB face drivers (right and left) for machining of the new stub axle.
    • CURRENT TOOLING
    • The workpiece needs one operation of facing with interrupted cut and different precision turnings.

    Tecnologie FRB have chosen to use the face driver 20/70 special flanged dwg.1998/00 and 2003/00 and the live center with load distribution MT5 dwg.2508/01 to work with a couple that grants stiffness to the system and precision.
    COSTS:

    • By using self-compensating face drivers it has been possible to make the required machining in only one operation.
    • Simplicity of management and maintenance of the face driver and of the wear parts, rapidity of replacement of the live center compared to replacement of bearings and to overhaul of traditional tailstock, are features that increase efficiency and contribute to reduction in costs.

     

    Turning of differential carrier frb schema 1519/99

    DIFFERENTIAL CARRIER – FRB SCHEMA 1519/99


    DIFFERENTIAL CARRIER – FRB SCHEMA 1519/99

     

    • MACHINING: Complete roughing and finishing turning.
    • REQUIRED QUALITY
      • Tolerance: 0,05 mm on main Ø
      • Tolerance: 0,03 mm on dimensions
      • Concentricity: 0,025 mm.
    • ORIGINAL CYCLE
      • Centering facing.
      • Turning of first part with clamping on blank Ø with self-compensating chuck.
      • Turning of opposite part with clamping on machined Ø with self centering chuck.
    • Tecnologie FRB CYCLE
      • Centering facing.
      • Complete turning of both parts with self compensating face driver and live center.

    RESULTS:

    • QUALITY: The workpiece isn’t affected by dispersion of longitudinal position and of concentricity due to self-compensating chuck of the first operation and to errors on 2° clamping.
    • PRODUCTION: Reduction of machine time of 20’’ for each turned workpiece , because of elimination of load/unload and stop of the chuck. It’s supposed that 3 lathes with FRB cycle machine as 4 of original cycle because of the increase of efficiencyb due to stops for tools change or defects that don’t interfere bwith the second turning.
    • COSTS: Using face drivers determines simplicity of management and maintenance because wear parts, as driving pins and central point, are at quick change and have costs decidedly lower than management of chucks (self-compensating and self-centering) groups.