1 Introduction
2 Experimental setup
Parameter | Symbol | Investigated magnitudes | Unit |
---|---|---|---|
Punch diameter | Ø | 10; 20 | mm |
Relative die clearance | u | 4.5, 10.0, 15.0, 22.5 | % |
Punch-penetration-depth | ppd | 0.5, 2.0 | mm |
Cutting edge radius | r | 50, 250 | µm |
Lubrication | - | lubricant 1, lubricant 2, w/o lubricant | – |
3 Sheet metal material and lubrication
C | Mn | P | S | Cr | Al | Cu | Fe | |
---|---|---|---|---|---|---|---|---|
wt% | 0.06 | 0.2 | 0.01 | 0.01 | 0.02 | 0.05 | 0.01 | Rest |
Re (MPa) | Rm (MPa) | A80 (%) | |
---|---|---|---|
DC03 | 240 | 270–370 | 34 |
4 Measurement of the partial forces
4.1 Vacuum force
4.1.1 Test execution and evaluation
4.1.2 Results
4.2 Burr clamping force
4.2.1 Test execution and evaluation
-
Gravitational force of the slug
-
Acceleration force due to the accelerated mass of the slug while pushing-off
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Burr clamping force
-
Magnetic forces if there is residual magnetism in the punch or the slug