3 Fundamentals of press design

32 Basic principles of metal forming
Table 2.2.1: Conversion of technical to SI units of measurement
Unit system Technical (m kp s) SI (MKS)
Time: t 1 s 1 s
Length: l 1 m 1 m
Speed: v 1 m/s 1 m/s
Revolutions /no. of strokes: rpm rpm
Acceleration: a 1 m/s2 1 m/s2 Mass: G 9,81 kg = 1 kp s2 /m 1 kg
1 t = 1000 kg
Density: � 9,81 kg/m3 = 1 kp s2 /m4 1 kg/m3 Force: F 9,81 kg m/s2 = 1 N (Newton) = 1 kg m/s2 1 kp 1MP = 1000 kp 1 kN = 1000 N
Pressure: p 9,81 N/m2 = 1 kp/m2 1 N/m2 = 1 Pa (Pascal) = 1 kg/m s2 0,0981 bar = 1 at 105 N/m2 1,333 mbar = 1 Torr
= 1 bar
Tension: � 9,81 N/mm2 = 1 kp/mm2 1 N/mm2 Torque: M 9,81 N m = 1 kp m 1 N m
1 kN m = 1000 N m
Mass moment of inertia: J 9,81 kg m2 = 1 kp m s2 1 kgm2 Performance: P 9,81 W = 1 kp m/s 1 N m/s = 1 W (Watt)
0,7355 kW = 1 PS 1kW = 1000 W
Work: W 9,81 J = 1 kp m 1 J (Joule) = 1 N m = 1 W s
1kJ = 1000 J
Quantity of heat: Q 4,19 kJ = 1 kcal 1 kJ
Sound pressure level: L 1 dB(A) 1 dB(A)
Bibliography
DIN 8580 (Entwurf): Manufacturing Methods, Classification, Beuth Verlag, Berlin.
DIN 8582: Manufacturing methods, forming, classification, subdivision, Beuth Verlag, Berlin.
DIN 8583: Manufacturing methods, forming under compressive conditions, Part 1 - 6, Beuth Verlag,
Berlin.
DIN 8584: Manufacturing methods, forming under combination of tensile and compressive conditions,
part 1 - 6, Beuth Verlag, Berlin.
DIN 8585: Manufacturing methods, forming under tensile conditions, part 1 - 4, Beuth Verlag, Berlin.
DIN 8586: Manufacturing methods, forming by bending, Beuth Verlag, Berlin.
DIN 8587: Manufacturing methods, forming under shearing conditions, Beuth Verlag, Berlin.
DIN 8588: Manufacturing methods, terms, dividing, Beuth Verlag, Berlin.
Lange, K: Umformtechnik, Band 1: Grundlagen, Springer-Verlag, Heidelberg (1984).
Metal Forming Handbook / Schuler (c) Springer-Verlag Berlin Heidelberg 1998