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Anchor Lamina GmbH
Jan Schiefer
An der Wiesenmühle 19
09224 Chemnitz, OT Grüna
Germany

Phone: +49 371 842450
Fax: +49 371 243506-50
http://anchorlamina.de

Rotary Benders - Examples and Options

1. using internal stripper plate

  • Reduction/ Elimination of tool markings in case of using an internal stripper plate
Rotationsbieger Beispiel Anwendung

Channel Bends

  • Channel bend is done with two benders side by side in one operation
  • min. channel width PC = 2x Dimension B (see table)
Rotationsbieger Anwendung U Biegen Kompakt
  • with compact beder CMB
Compact - UnitsB [mm]C [mm]min. PC [mm]
 CMB-20 1818 36
 CMB-25 20 20 40
 CMB-35 25 25 50
 CMB-50 35 35 70
 CMB-65 45 45 90
Standard - UnitsB [mm]C [mm]min. PC [mm]
 MB-16 19,134,938,2
 MB-20 253550
 MB-25 304560
 MB-35 386076
 MB-40 405880
 MB-50 5076100
 MB-65 6092120
 MB-80 70105140
 MB-100 85120170
 MB-115 90127180

3. interlaced Benders

  • for channel bends, where minimum dimension PC of Standard / Compact Units is not narrow enough
  • Custom interlacing to required channel dimension PC
  • use of stripper is recommended to prevent part from bulging
Rotationsbieger Anwendung verzahntes Biegen 3
Rotationsbieger Anwendung verzahntes Biegen 2

4. Z-Bends

  • Z-Bend= 2 bendings are realized by one bender in one operation (including over bend)
  • Pressure pad is used optionally to make up the difference between part height and dimension l of the rocker
  • Over bend is possible, rocker shape is designed according to customer requirements
  • Bending lobe for second bend is used as anvil, the radius of the bending lobe is designed based on the required part radius
Rotationsbieger Anwendung Z Biegen 2
Rotationsbieger Anwendung Z Biegen 3

Rotationsbieger Anwendung Doppel Z Biegen

5. Double Z- Bends or Hat-Bends

  • two benders including internal pressure pad are used
  • for adjustment benders can be moved horizontally against each other
  • Pressure pad is used to make up the difference between part height and dimension l of the rocker
  • Over bend is possible, rocker shape is designed according to customer requirements
  • Bending lobe for second bend is used as anvil, the radius of the bending lobe is designed based on the required part radius

6. overbends up to 120°

  • over square bends up to 120° are possible, the rocker angle and shape is designed accordingly
  • the use of a pressure pad is suggested for over square bends over 110° to keep the rocker from sticking to the part
Rotationsbieger Anwendung Biegen über 120° 2
Rotationsbieger Anwendung Biegen bis 120° 3

7. Under square (bending angle less than 90°)

  • for bending under square the rocker angle and shape is designed accordingly
  • bending angle of minimum 60° (equals 120° rocker angle) possible, smaller bending angles on request
  •  generally it is recommended to use a pressure pad, but mandatory for bending angles smaller than 70°, in order to prevent part from sticking to the rocker when tool is opening
Rotationsbieger Anwendung Biegen kleiner 90°

8. short leg bends

  • short leg bends require a recessed step in the bending lobe of the rocker
  • as compared to a standard rocker-shape the required tonnage will increase (reduced lever dimension G)
Rotationsbieger Anwendung Kurzschenkelbiegen 2
Rotationsbieger Anwendung Kurzschenkelbiegen 3

9. large bend radius

  • a bend radius exceeding 2 times part thickness
  • choose larger size rocker than standard choice (table) to accomplish part clamping at large radius bends
  • Please consider :
    • The larger the bend radius the larger is the material spring back!
Rotationsbieger Ablauf große Biegeradien

example: PT= 3,2mm R=8mm

  • per Standard catalogue choice MB40-Bender is possible,  but use MB50-Bender
techn. dataMB-16MB-20MB-25MB-35MB-40
 RD [mm] 1620253540
 Max. PT [mm]11,2233,5
techn. dataMB-50MB-65MB-80MB-100MB-115
  RD [mm] 506580100115
  Max. PT [mm] 4,567,58,59,5

10. Dart Stiffener

  • dart stiffeners in the part are possible with ACCU-BendTM Rotary benders
  • size of the dart can be designed into the rocker based on customer requirement
  • dart stiffener included in rocker geometry
  • Please consider: less spring back
Rotationsbieger Anwendung Sicken

11. Delrin- inserts

  • Delrin- ® is a hard, low-friction polymer used as contact material for those applications where slight tool marks are not acceptable
  • for rocker diameter 25mm- 115mm Delrin ®- inserts in tool steel rocker
  • use pressure pad to prevent tool marks on stripper side
  • use only for low production volumes < 100K parts
Rotationsbieger Anwendung Delrin-Einsatz

Source: https://en.anchor-lamina.de/Rotary_Benders_-_Examples_and_Options

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