DATA OF SPRING PLAN

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SPRING DESIGN BASICS

GLOBAL NO.1 SPRING
Symbol Contents Symbol Contents
d Diameter of materials ㎜ D1 Coil bore (Dt)㎜
D2 Coil bore (Dt)㎜ D coil core ㎜
Nt Total no. of coils(N) Na coil spring winding(n)
Hf free field Hs solid height Hs solid height
p speed ㎜ Pi initial magnetism ㎏
C= D/d spring index G modulus of of transverse elasticity ㎏/㎟
P weight taken on spring ㎏ б slack of spring ㎜
k essence of spring ㎏/㎜ て˚ torsion stress ㎏/㎟
torsion stress ㎏/㎟ てi torsion stress due to initial tension ㎏/㎟
K stress adjusting factor W weight of spring gr
g acceleration of gravity = 9800 ㎜/D2 f number of vibration c.p.s
u energy stored in spring ㎏/㎜ r weight of unit volume of material ㎏/㎟
R(R1,R2) load action, radius mm E module of direct elasticity ㎟
I module of direct elasticity ㎜4 Z section modulus ㎟
a1, a2 length of Arm ㎜ L 스프링의 유효부전개길이 ㎜
Kt , Ktd constant of spring △D 부항상태에서의
㎏-1㎜/rad, ㎏-㎜/deg decrease of mean diameter of coil ㎜
Ds diameter of guide bar ㎜ Kb bending stress adjusting factor
σ bending stress ㎏/㎟ Ø(Ød) angle of torsion of spring rad°
material value of g kgf/㎟ (N/㎟) value of g kgf/㎟ (N/㎟)
hard steel wire 8*10² 21*10²
piano wire 8*10^3 21*10^3
oil temper wire 8*10^3 21*10^3
stainless steel wire STS 302 7.2*10^3 19*10^3
STS 304
STS 316
STS 321 J1 7.5*10^3 20*10^3
brass wire 4*10^3 10*10^3
양백선 4*10^3 11*10^3
phosphor bronze wire 1.3*10^3 10*10^3
beryllium copper wire 1.5*10^3 13*10^3
value of module of elasticity g of formula 2 allowable stress of material
material value of g
kgf/mm2(N/mm2)
material allowable stress
spring structural steel 8 * 10^3 (78*10^2) hard steel wire 0.5 * δB
hard steel wire 8 * 10^3 (78*10^2) piano wire 0.5 * δB
piano wire 8 * 10^3 (78*10^2) stainless steel wire 0.45 * δB
oil temper wire 8 * 10^3 (78*10^2) phosphor bronze wire 0.4 * δB
stainless steel wire STS 302 7 * 10^3 (69*10^2) specific gravity of material
STS 304 material specific gravity g/mm3
STS 316 piano wire 7.8 * 10-3
STS 631 J1 7.5 * 10^3 (74*10^2) hard steel wire
brass wire 4 * 10^3 (39*10^2) stainless steel wire 7.93 * 10-3
양백선 4 * 10^3 (39*10^2) phosphor bronze wire 8.8 * 10-3
phosphor bronze wire 4.3 * 10^3 (42*10^2) brass wire 8.6 * 10-3
beryllium copper wire 4.5 * 10^3 (44*10^2) 베리움동선 8.26 * 10-3
item - tolerance or range
free height - (a) If there is designation of feature of spring, it would be reference value
(b) If there is no designation of feature of spring, +-2% of free height
diameter of coil - Regulate either inner diameter or outer diameter of coil.
코일지름 - free height mm / tolerence
- under 250 / mean diameter of coil ±1%, minimum ±1.5mm
- over 250, under 500 / mean diameter of coil ±1.5%, minimum ±1.5mm
- over 500 / Follow treaty between delivery and taking delivery
- If needed, tolerance can be set on one side only.
In this situation, set range of tolerance to one side
total no. of coils - (a) If there is designation of feature of spring, it would be reference value
- (b) If there is no designation of feature of spring, 1/4 no. of coils to pressed spring
- *For tension spring, follow treaty between delivery and taking delivery including
outer side of coil - At the state of free height of pressed spring, calculation of slope of outer side of coil about each end of right angle axis makes
tolerated limit 0.05Ho(2.9°), especially when needed 0.02 Ho(1.15°)
slope - *(주) Ho : free height , inside () is angle of slope
floating of pitch - When pressing 80% of slack from pressing spring of same pitch, except for both end, it should not be adhesion to the coil
feature of spring designation Feature of spring is designating height of designated weight or weight of designated height.
Especially, when spring constant is needed, it can be designated
height of designated height ±(1.5mm+deflection plan of designated weight 3%)(mm) But, minimum is 1% of free height
Height of designated weight is between 20-80% of slack of spring when tested weight’s slack
weight of designated height ±(1.5mm+deflection plan of designated weight3%) *spring constant (kgf)(N)or  ±(1.5mm+or deflection plan of designated height 3%)*100(%) 
or deflection plan of designated height
(1.5mm+deflection plan of designated weight 3%)But, minimum is 1% of free height
Height of designated weight is between 20-80% of slack of spring when tested weight’s slack
spring constant But, when precision is needed, can be designated up to ±5% due to feature of usage.
Spring constant is decided by difference of weight and deflection between 2 weight from deflection of tested weight