Page 40 - Metalorming Magazine January/February 2023

R14.6 mm
R12.0 mm
R10.0 mm
105.2 mm
R10.0 mm 100.0 mm
Knockout
Punch insert
Fig. 2—Punch/die dimensions
Die insert
Blank holder
“Conventional” Profile
Time[s]
Distance off Bottom [mm]
“Soft Contact” Profile
“Pulsating” Profile
Time[s]
Distance off Bottom [mm]
Distance off Bottom [mm]
“Dwell” Profile
Time[s]
Distance off Bottom [mm]
“Constant Speed” Profile
Time[s]
Time[s]
Distance off Bottom [mm]
Fig. 3—Servo-motion profiles used in the experiments
400
350
300
250
200
150
100
50 0
Fig. 4—Speed effect on punch force for forming 1.4-mm-thick DP980 steel into a square cup, 40 mm deep.
cell installed under the punch to meas- ure forming loads. Tests were per- formed using 1.4-mm-thick Gen 3 (980- MPa tensile strength) and dual-phase steels, as well as 1-mm-thick Al 6005 (Table 2).
Note: All materials and their mechan- ical properties were provided by the Center for Precision Forming at The Ohio State University, and its sponsors.
Faster is Better
The researchers performed their metal forming tests on 210-mm-dia. round blanks, drawn into 50-mm- square40mmdeepfordual-phase steel and 50 mm deep for Gen3 steel and Al 6005. The holding force at the
Punch Force [kN]
20 rpm
DP980/1.4 mm
5 rpm
0 10 20 30 40
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