AHMEDABAD INSTITUTE OF TECHNOLOGY

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Presentation transcript:

AHMEDABAD INSTITUTE OF TECHNOLOGY Prepared By 130020119100 – Nirmal Sinroja 130020119101 – Smit Patel 130020119102 – Kirtee Sohalia 130020119104 – Aditya Soni 130020119105 – Rutul Soni Guided By P D Panchal & J R Mewada

Design of Helical spring

Springs Springs Characterized By: Ability to deform significantly without failure Ability to store/release PE over large deflections Provides an elastic force for useful purpose

Springs How used in mechanical design? Shock/Vibration protection Store/Release PE Offer resisting force or reaction force for mechanism Example: Valve spring pushes rocker arm so lifter follows cam VCR lid – torsion springs keeps door closed

Function of 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

Design consideration of helical spring

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 coils n = Number of active coils p = 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)

Spring material High carbon steel 4. Copper based alloy 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) 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)

Effect of End treatment

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 4. Spring rate (k) 8. Wahl correction factor

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

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

Spring testing machine

Thank You