HAS WON QS9000 / ISO-9002 INTERNATIONAL QUALITY APPROVAL
SPRING FORMULA

1. Formula of compressed, elastic screw spring (Round section)
 Calculated from  P (kg) Calculated from  d (mm) Calculated from  P (kg/mm2) Formula of load P(kg) - Gd4  　P =─── d 　　　8nD3 pd3  　P =─── t 　　　8D Formula of Elasticity d (mm) 8nD3  　d =─── P 　　　d4G - pnD2 　d =─── t 　　　dG Formula of Stress t (kg/mm2) 8D 　t =─── P 　　　pd3 dG  　t =─── d 　　　pnd2 -

 Relationship between spring index and initial stress:
2. Formula of torque spring :
 Calculated from  M (kg-mm) Calculated from  elasticity ao Calculated from  stress d (kg/mm2) Formula of M (kg-mm) - Epd4 M =──── a 　　11520nD pd3 　M =─── d 　　　32 Formula of Elasticity  ao 11520nD 　a =────M 　　　pd4E - 360nD 　a =─── d 　　　dE Formula of Stress  d (kg/mm2) 32 　d =─── M 　　　pd3 Ed 　d =─── a 　　　360nd -
 3. Sign of symbol: d : Dia.  G: elastic modulus D: average dia. E: longitudinal elastic modulus n : effective roll P : Load

Elastic modulus of SPRING MATERIAL

 Material Modulus of transverse latitudixal elasticity  G value (kg/mm2) Modulus of longitudinal elasticity  E value (kg/mm2) Spring steel SUP 8X103 21X103 Piano wire SWP 8X103 21X103 Tempering wire SWOC 8X103 21X103 Hardening bronze wire SWC 8X103 21X103 Stainless steel wire SUS631 7.5X103 21X103 Stainless steel wire SUS316 7X103 19X103 Stainless steel wire SUS304 7X103 19X103 Stainless steel wire SUS302 7X103 19X103 Bronze wire 4.5X103 13X103 Phosphor bronze 4.3X103 10X103 Brass wire 4X103 10X103 White brass wire 4X103 11X103

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