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Case study: variable adjustment of inner diameter (1)
Established within the GROWTH project GRD1-1999-10748 "Improvement of Service Life and Reliability of Cold Forging Tools with respect to Fatigue Damage due to Cyclic Plasticity (COLT)", funded by the European Community.
COLT Design Manual for Cold Forging Dies
Case study: net-shape forging in close tolerancesCase study: net-shape forging in close tolerancesby STRECONby STRECON®® VARI-FIT VARI-FIT
Example for net-shape forgedspline on hollow steering shaft
Model of a STRECON® VARI-FIT
Case study: variable adjustment of inner diameter (2)
Established within the GROWTH project GRD1-1999-10748 "Improvement of Service Life and Reliability of Cold Forging Tools with respect to Fatigue Damage due to Cyclic Plasticity (COLT)", funded by the European Community.
COLT Design Manual for Cold Forging Dies
Principle design of a STRECONPrinciple design of a STRECON®® VARI-FIT VARI-FIT
die insert
carbidewinding core
stripwinding
intermediaterings
axial prestressing
• Strip-wound container withcarbide winding core
• Combined radial and axial prestressing
• Change of the inner diameter of the die by controlled axial displacement of the die
• Intermediate rings define the axial position of the die
• Quick disassembly and assembly for rearrangement of the intermediate rings
lowest position maximum diameter
highest position minimum diameter
Case study: variable adjustment of inner diameter (3)
Established within the GROWTH project GRD1-1999-10748 "Improvement of Service Life and Reliability of Cold Forging Tools with respect to Fatigue Damage due to Cyclic Plasticity (COLT)", funded by the European Community.
COLT Design Manual for Cold Forging Dies
Example:
Inner diameter of the die insert: Ø28mm
Die insert material: WC or HSS
prestressed by STRECON® VARI-FIT
die made of high-speed steel:circa 3 µm diameter change per 0.1 mm axial displacement
die made of carbide:circa 2 µm diameter change per 0.1 mm axial displacement
Variable adjustment of the inner diameter of the dieVariable adjustment of the inner diameter of the die
Case study: variable adjustment of inner diameter (4)
Established within the GROWTH project GRD1-1999-10748 "Improvement of Service Life and Reliability of Cold Forging Tools with respect to Fatigue Damage due to Cyclic Plasticity (COLT)", funded by the European Community.
COLT Design Manual for Cold Forging Dies
Turning
Heat Treatment
Grinding
EDM
Polishing
Coating
Serial productionand on-going inspection
no
in case of conventional prestressing
systems
nono
no
in case of STRECON®
VARI-FIT
Shortening the Shortening the process chain of process chain of manufacturing andmanufacturing andset-up of dies byset-up of dies bySTRECONSTRECON®® VARI-FIT VARI-FIT
OK?
Prestress-Assembly
Tool set-up in the press
Forging and inspection ofsamples
OK?
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