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Design of Helical spring

Design of Helical spring. What is helical spring. Helical spring is a spiral wound wire with a constant coil diameter and uniform pitch . Function of Helical spring. Used to store energy and subsequently release it To absorb shock To maintain a force between contacting surfaces.

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Design of Helical spring

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  1. Design of Helical spring

  2. What is helical spring Helical spring is a spiral wound wire with a constant coil diameter and uniform pitch. Function of Helical spring • Used to store energy and subsequently release it • To absorb shock • To maintain a force between contacting surfaces

  3. Design consideration of helical spring

  4. Nomenclature of Helical spring C = Spring Index D/d d = wire diameter (m)D = Spring diameter (m)Di = Spring inside diameter (m)Dil = Spring inside diameter (loaded ) (m)E = Young's Modulus (N/m2)F = Axial Force (N)G = Modulus of Rigidity (N/m2)K W = Wahl Factor = [(4C-1)/(4C+5)}]+ (0,615/C)L 0 = Free Length (m)L s = Solid Length (m)n t = Total number of coilsn = Number of active coilsp = pitch (m)y = distance from neutral axis to outer fibre of wire (m)τ = shear stress (N/m2)τ max = Max shear stress (N/m2)θ = Deflection (radians)

  5. Spring material • 4. Copper based alloy • Phosphor Bronze (Grade A) - ASTM B159 • Beryllium Copper - ASTM B197 • Monel 400 (AMS 7233) • Monel K500 (QQ-N-286 • Nickel based alloy • A286 Alloy • Inconel 600 (QQ-W-390) • Inconel 718 • Inconel X-750 (AMS 5698, 5699) • High carbon steel • Music Wire (ASTM A228) • Hard Drawn (ASTM A227) • High Tensile Hard Drawn (ASTM A679) • Oil Tempered (ASTM A229) • Carbon Valve (ASTM A230) • Alloy spring steel • Chrome Vanadium (ASTM A231) • Chrome Silicon (ASTM A401) • Stainless steel • AISI 302/304 - ASTM A313 • AISI 316 - ASTM A313 • 17-7 PH - ASTM A313(631)

  6. Effect of End treatment.

  7. The module calculates the following design parameters: 1. Outer Diameter (Do) 5. Maximum load 2. Spring Index (C) 6. Corrected maximum stress index range is 4 to 12 3. Slenderness ratio 7. Uncorrect maximum stress 8. Wahl correction factor 4. Spring rate (k)

  8. 12. Shear stress 9. Maximum deflection 10. Spring mass 13. uncorrected Shear stress 11. Wire length 14. Natural frequency

  9. CHECKING • Stability of spring (buckling) 2. Fatigue loading

  10. Spring testing machine

  11. Thanks

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