HELICAL SPRINGS
FOLLOWING DIN EN 13906-1,2,3
Order : Dware
Project : HeliSpring
Subproject : Dimensioning Torsion Spring
Project item : Spring for Sectional Car Port
Spring ID : 60x1200
Calculated by : André Dewispelaere
Organization : Dware
Date : 03.12.2025 




   Spring wire grade




 Nr, Cl, Spring Wire Grade       ,      E,     G,  rho,  Rm1, Rco




230, FD, EN 10270-2 FDSiCr       , 206000, 79500, 7.85, 2000, 320
1 Calculated wire properties Symbol Unit Value
2 Wire diameter d mm 7.000
3 Minimal ultimate tensile strength Rm N/mm˛ 1730
4 Module of rigidity G N/mm˛ 79500
5 Module of Elasticity E N/mm˛ 206000

1 Spring Specifications Symbol Unit Value
2 Outside diameter of spring De mm 60.00
3 Nominal wire diameter d mm 7.000
4 Coil space unloaded spring a mm 0.500
5 Total number of coils nt -- 159.00
6 Body length unloaded LK0 mm 1200.0
7 Type spring end A ETA -- rad inside
8 Number of inactive coils A nnaA -- 0.00
9 Distance force action point LFA mm 20.0
10 Length of end lA mm 10.0
11 Inner bending radius of end rA mm 7.0
12 Type spring end B ETB -- rad inside
13 Number of inactive coils B nnaB -- 0.00
14 Distance of force action point LFB mm 20.0
15 Length of spring end lB mm 10.0
16 Inner bending radius of end rB mm 7.0
17 Hand of coils -- -- left
18 Coiling -- -- cold
19 Shot peening -- -- Yes
20 Spring Load Symbol Unit Value
21 Load expressed by -- -- tors moment
22 Minor torsional moment M1 Nm 8.00
23 Major torsional moment M2 Nm 32.00
24 Number of load cycles Ncy Mcy 0.010
25 Calculation of geometry Symbol Unit Value
26 Outside diameter of spring De mm 60.00
27 Mean diameter of coil D mm 53.00
28 Inside diameter of spring Di mm 46.00
29 Spring index w -- 7.57
30 Number of active coils n -- 159.00
31 Developed length of active coils l mm 26501
32 Spring rate RMRv Nm/rev 5.757
33 Coil pitch when unloaded m0 mm 7.500
34 Coil space unloaded spring a mm 0.500
35 Permissible max space between coil amax mm 12.77
36 Force in action point leg A FA N 1600.000
37 Force in action point leg B FB N 1600.000
38 Free body length LK0 mm 1199.5
39 Spring diagram Symbol Unit Value
40 Minor torsional moment M1 Nm 8.000
41 Minor torsion angle nrev1 rev 1.390
42 Major torsional moment M2 Nm 32.000
43 Major torsion angle nrev2 rev 5.558
44 Permissible max torsional moment Mn Nm 36.380
45 Permissible max torsion angle nrevn rev 6.319
46 Strength calculation Symbol Unit Value
47 Stress correction factor q -- 1.120
48 Corrected minor bending stress σbq1 N/mm˛ 266
49 Corrected major bending stress σbq2 N/mm˛ 1064
50 Permissible static bending stress SbP N/mm˛ 1210
51 Safety factor major bend stress SF -- 1.14
52 Strength domain -- -- static
53 Permissible endurance stress σbeN N/mm˛ 1210
54 Permissible upper bending stress σbqO N/mm˛ 1210
55 Safety factor upper bending stress SFO -- 1.14
56 Corrected lower bending stress σbqU N/mm˛ 266
57 Stroke bending stress σbqh N/mm˛ 798
58 Permissible stroke bending stress σbqH N/mm˛ 944
59 Safety fact stroke bending stress SFH -- 1.18
60 Length - weight of wire Symbol Unit Value
61 Total length of developed wire lw mm 26540
62 Mass of spring mw g 8018
63 Spring work Symbol Unit Value
64 Minor spring work W1 J 34.935
65 Major spring work W2 J 558.751
66 Work exchange DW J 523.817
67 Frequency analysis Symbol Unit Value
68 Natural revolv-frequency of coils fa Hz 6.35