HELICAL SPRINGS | |
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FOLLOWING DIN EN 13906-1,2,3 | |

Order : | Dware |

Project : | HeliSpring |

Subproject : | Dimensionig extension spring |

Project item : | Metallfedern |

Spring ID : | S.202 |

Calculated by : | André Dewispelaere |

Organization : | Dware |

Date : | 26/07/2021 |

Spring wire grade |
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Nr, Cl, Spring Wire Grade , E, G, rho, Rm1, Rco |

421, CR, 1.4310 X10CrNi18-8 HS , 180000, 70000, 7.90, 2050, 700 |

Calculated wire properties | Symbol | Unit | Value |
---|---|---|---|

Wire diameter | d | mm | 1.600 |

Minimum value tensile strength | R_{m} |
N/mm˛ | 1910 |

Modulus of rigidity | G | N/mm˛ | 70000 |

Modulus of Elasticity | E | N/mm˛ | 180000 |

Design specifications | Symbol | Unit | Value |
---|---|---|---|

Minor axial spring force | F_{1} |
N | 30.0 |

Major spring force | F_{2} |
N | 92.0 |

Stroke length | s_{h} |
mm | 31.0 |

Number of loading cycles | N_{cy} |
Mcy | 0.010 |

Outside diameter not greater than | D_{e} |
mm | 0.00 |

Imposed spring index | w | -- | 7.00 |

Coiling | -- | -- | cold |

Initial tension force to apply | -- | -- | Yes |

Coiled with | -- | -- | Bench |

Hand of coils | -- | -- | right |

Spring end A | ET_{A} |
-- | german loop |

Spring end B | ET_{B} |
-- | german loop |

Shot peening | -- | -- | No |

Geometry calculation | Symbol | Unit | Value |

Calculated wire diameter | d_{c} |
mm | 1.44 |

Selected wire diameter | d | mm | 1.600 |

Wire diameter deviation | A_{d} |
mm | 0.020 |

Mean diameter of coil | D_{} |
mm | 11.10 |

Spring index | w | -- | 6.94 |

Outside diameter of spring | D_{e} |
mm | 12.7 |

Inside diameter of spring | D_{i} |
mm | 9.5 |

Initial torsional stress | τ_{0} |
N/mm˛ | 175.0 |

Attainable initial tension force | F_{0i} |
N | 25.4 |

Number of active coils | n | -- | 21.00 |

Spring rate | R | N/mm | 1.997 |

Initial tension force | F_{0} |
N | 26.1 |

Coil pitch at free length | m_{0} |
mm | 1.620 |

Coil space at free length | a_{0} |
mm | 0.000 |

Nominal free length of spring | L_{K} |
mm | 35.6 |

Length of spring end A | L_{HA} |
mm | 8.0 |

Number inactive coils spring end A | n_{naA} |
-- | 0.00 |

Length of spring end B | L_{HB} |
mm | 8.0 |

Number inactive coils spring end B | n_{naB} |
-- | 0.00 |

Total number of coils | n_{t} |
-- | 21.00 |

Spring free length inside loops | L_{0} |
mm | 51.6 |

Calculation spring diagram | Symbol | Unit | Value |

Minor deflection | s_{1} |
mm | 2.0 |

Length at minor deflection | L_{1} |
mm | 53.6 |

Minor spring force | F_{1} |
N | 30.0 |

Major deflection | s_{2} |
mm | 33.0 |

Length at major deflection | L_{2} |
mm | 84.6 |

Major spring force | F_{2} |
N | 92.0 |

Maximum permissible deflection | s_{n} |
mm | 49.3 |

Maximum permissible spring length | L_{n} |
mm | 100.9 |

Maximum permissible load force | F_{n} |
N | 124.6 |

Strength calculation | Symbol | Unit | Value |

Stress correction factor | k | -- | 1.202 |

Corrected minor torsional stress | τ_{k1} |
N/mm˛ | 249 |

Corrected major torsional stress | τ_{k2} |
N/mm˛ | 763 |

Permissible static torsion stress | τ_{P} |
N/mm˛ | 860 |

Safety factor on major stress | S_{F} |
-- | 1.13 |

Tors stress at max permiss length | τ_{n} |
N/mm˛ | 860 |

Permissible static torsion stress | τ_{P} |
N/mm˛ | 860 |

Safety factor at max permis length | S_{Fn} |
-- | 1.00 |

Strength domain | -- | -- | static |

Permissible endurance stress | τ_{eN} |
N/mm˛ | 860 |

Permissible upper torsional stress | τ_{kO} |
N/mm˛ | 860 |

Safety factor upper torsion stress | S_{FO} |
-- | 1.13 |

Corrected lower torsional stress | τ_{kU} |
N/mm˛ | 249 |

Corrected stroke torsional stress | τ_{kh} |
N/mm˛ | 514 |

Permissible stroke torsion stress | τ_{kH} |
N/mm˛ | 611 |

Safety factor on variable stress | S_{FH} |
-- | 1.19 |

Length of wire for spring | Symbol | Unit | Value |

Length of wire spring end A | l_{HA} |
mm | 25.4 |

Length of inactive coils A | l_{naA} |
mm | 0.0 |

Length of active coils | l_{K} |
mm | 733.1 |

Length of inactive coils B | l_{naB} |
mm | 0.0 |

Length of wire spring end B | l_{HB} |
mm | 25.4 |

Total length of wire | l_{w} |
mm | 784.0 |

Mass of spring | m_{w} |
g | 12.5 |