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)
-
   Gd
 P =─── d
   8nD3
   pd
 P =─── t
   8D
Formula of Elasticity d (mm)    8nD
 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

33-18, 1-Te South Rd., Niu Pu Li,
Chang-Hua City, Taiwan, R. O. C.
TEL:886-4-7376117~9
FAX:886-4-7376120
http://www.ryk.com.tw
E-mail:ryc@ms24.hinet.net
  • INTRODUCTION OF COMPANY
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