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Imprint - english - Gutekunst Federn
Imprint
Gutekunst + Co.KG
Spring Factories
Carl-Zeiss-Straße 15
D-72555 Metzingen
Manager:
Holger Gutekunst
VAT.no.: DE814933590
HRA 360 835 / Stuttgart
Telephone 0049 71 23 9 60-0
Telefax 0049 71 23 9 60-195
order@gutekunst-co.com
Project leader
Gutekunst + Co.KG
Spring Factories
Carl-Zeiss-Straße 15
D-72555 Metzingen
J. Mugrauer
Telephone 0049 71 23 9 60-158
Telefax 0049 71 23 9 60-183
mugrauer@gutekunst-co.com
Producer
Hölle & Hüttner AG
Informationstechnologie
Derendinger Straße 40
D-72072 Tübingen
Dipl.Ing. L. Boll
Dipl.Ing. W. Fetzer
Telephone 0049 70 71 97 61-1
Telefax 0049 70 71 97 61-90
info@h-net.com
Producer CAD
KIM GmbH
Informationstechnologie
Kapellenweg 31
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Telephone 0049 6851 80 00 6-0
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Gutekunst Federn
· Carl-Zeiss-Strasse 15 · D-72555 Metzingen
F
on 0049 (0)7123 960-0 · Fax 0049 (0)7123 960-195
order@gutekunst-co.com
Extension spring - calculation - information - english - Gutekunst Federn
information extension spring calculation
1.
pre-setting side
material properties
2.
result page
symbols
3.
print / inquire / search
loop shapes
1. pre-setting extension spring calculation
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Material, quality category as per DIN 2095, loop shape and a valid combination of diameter, spring forces, spring deflections and lengths must be entered in the parameter pre-settings.
Standard combinations include i.e.:
De or Di, F2, R
De or Di, F2, R, L0
De or Di, F2, s2
De or Di, F2, s2, F1 or s1
De or Di, F2, L2, L0
De or Di, F2, L2, F1 or L1
You have 3 possibilities for entry:
all calculation pre-settings
Here, all entry windows for the calculation are available.
Di
= inner coil diameter (mm)
De
= outer coil diameter (mm)
F0
= initial tension (N)
F1
= prestressed spring force (N)
F2
= loaded spring force (N)
s1
= prestressed spring deflection (mm)
s2
= loaded spring deflection (mm)
R
= spring rate (N/mm)
L0
= unstressed spring length (mm)
L1
= prestressed spring length (mm)
L2
= loaded spring length (mm)
calculation according to paths and forces
In this case for a better overview, only the windows for the calculation according to paths and forces are available.
Di
= inner coil diameter (mm)
De
= outer coil diameter (mm)
F0
= initial tension (N)
L0
= unstressed spring length (mm)
s1
= prestressed spring deflection (mm)
F1
= prestressed spring force (N)
s2
= loaded spring deflection (mm)
F2
= loaded spring force (N)
calculation according to lengths and forces
In this case for a better overview, only the windows for the calculation according to lengths and forces are available.
Di
= inner coil diameter (mm)
De
= outer coil diameter (mm)
F0
= initial tension (N)
L0
= unstressed spring length (mm)
L1
= prestressed spring length (mm)
F1
= prestressed spring force (N)
L2
= loaded spring length (mm)
F2
= loaded spring force (N)
2. result page compression spring calculation
return
Once the computation has been started from the "Pre-settings", switch automatically to the "results" computing page which displays all the computed spring sizes.
To complete the calculation you are requested here to select the wire diameter < d > according to DIN 2076 and adapt the number of coils < n > and loops accordingly if required. The selection of wire diameter is compulsory. The nearest five values are available for selection in the drop-down lists. In the case of extension springs, the loop position (angle of rotation between the two loops) is changed by adapting the number of coils < n >.
The values entered from the "pre-setting" and the wire diameter < d > can be altered; they are displayed in white highlighted input fields. All other values are purely output values. The spring is recalculated on the basis of the modified values using the calculate button.
Invalid or faulty calculation results are displayed for you in the text box. Solution possibilities will be presented to you if you click on the individual fault messages.
Important
The tension coefficient "k" is incorporated as standard for the extension spring computation. The tension coefficient "k" takes approximate account of the maximum computed tension of the spring body.
Further functions of extension spring calculation
Loop adjustment
The "loop adjustment" shows all properties and values of the selected loops; it is automatically displayed in the current Extension spring design.
Adjustments are carried out as follows:
For computations in which the unstressed spring length < L0 > and the loop heights < LH1, LH2 > are not predefined, the loops heights are computed using a defined factor for the corresponding loop shape. Aou can adjust these predefined values as required, the correction is applied along the unstressed spring length < L0 >. However, when making the alteration please note the structural limitation of certain loop shapes (e.g. 1/1 german loop: Lh = 0,8 to 1,1 Di).
For computations in which the unstressed spring length < L0 > and the loop heights < LH1, LH2 > or just < L0 > are predefined, an "actual value" and a "nominal value" is computed in the loop adjustment. The function < centralise LH1, LH2 > enables you to align the "actual value" to the "nominal value". Here again please note the structural limitation of certain loop shapes. If necessary alter the loop shape.
Diagrams
The diagrams function provides you with the path-force diagram and the Goodmann diagram in the case of dynamic calculation.
3. print / inquire / search
return
You can print the calculation or send it as an inquiry direct to Gutekunst Federn. When you have sent your inquiry you will receive a copy of your inquiry back directly by e-mail.
You can search our catalogue range directly for a suitable spring using the "Search" function. As a standard, the search program works with a tolerance value of 10%. Please note that our catalogue springs are only supplied in the materials EN 10270-1 and EN 10270-3-1.4310.
Gutekunst Federn
· Carl-Zeiss-Strasse 15 · D-72555 Metzingen
Phone
0049 71 23 9 60-0 · Fax
0049 71 23 9 60-195
service@gutekunst-co.com
Extension springs - metal springs - formula - english - Gutekunst Federn - 2005
formula extension springs
formula
specification
unit
BstNr
order number
Mat
type of material
Oefo
loop shape
Oest
loop position
degrees
Oesttol
+/- tolerance of loop position
degrees
d
wire diameter
mm
D
mean coil diameter
mm
De
outer coil diameter
mm
Detol
+/- tolerance of outer coil diameter
mm
Dh
minimum bush diameter
mm
F0
initial tension
N
F1
prestressed spring force
N
F1tol
+/- tolerance of prestressed spring force
N
F2
loaded spring force
N
F2tol
+/- tolerance of loaded spring force
N
Fn
maximum spring force
N
Fntol
+/- tolerance of maximum spring force
N
Lk
length of relaxed spring body
mm
L0
length of unstressed spring, measured from inner edge of loop to inner edge of loop
mm
L0tol
+/- tolerance of unstressed length
mm
L1
prestressed spring length, inner loop to inner loop
mm
L2
loaded spring length, inner loop to inner loop
mm
Ln
maximum spring length, inner loop to inner loop
mm
s1
prestressed spring deflection
mm
s2
loaded spring deflection
mm
sh
maximum stroke
mm
sn
maximum spring deflection
mm
Lh
distance of inner edge of loop from the spring body
mm
m
loop opening width
mm
R
spring rate
N/mm
nt
total number of coils
pc.
Gew
weight of one spring
g
PG
price group
formula extension springs (spring calculation)
formula
specification
unit
General
Material
Material
G
Shearing modulus
N/mm²
E
Elasticity modulus
N/mm²
Rm min
Minimum tensile strength
N/mm²
tau zul
Permitted shearing strength
N/mm²
k
Stress coefficient
Quality grade
Production quality grade
Wire length
Wire length for producing a spring
mm
Wire weight
Wire weight for producing a spring
g
Loops
Loop position
Angle between loops
degrees
Loop shape 1
Loop shape 1
Lh 1
Loop height of eye shape 1
mm
Loop shape 2
Loop shape 2
Lh 2
Loop height of eye shape 2
mm
Diameter
d
Wire diameter
mm
Di
Inner coil diameter
mm
D
Mean coil diameter
mm
De
Outer coil diameter
mm
Dh min
Minimum bush diameter
mm
Lengths
L0
Length of unstressed spring, measured from inner edge of loop to inner edge of loop
mm
L1
Prestressed spring length, inner loop to inner loop
mm
L2
Loaded spring length, inner loop to inner loop
mm
Ln
Maximum spring length, inner loop to inner loop
mm
Lk
Length of relaxed spring body
mm
Deflections
s1
Prestressed spring deflection
mm
s2
Loaded spring deflection
mm
sn
Maximum spring deflection
mm
Forces
F0
Initial tension
N
F1
Prestressed spring force
N
F2
Loaded spring force
N
Fn
Maximum spring force
N
F0 winding bench
Alignment force for F0 for manufacture on winding bench
N
F0 automatic
Alignment force for F0 for manufacture on automatic unit
N
Spring rate
R
Spring rate
N/mm
Coils
n
Number of active coils
pc.
nt
Total number of coils
pc.
nt-n
Number of non-elastic coils
pc.
Pitch
St.
Spring pitch (coil centre to coil centre)
mm
St.W
Pitch angle
degrees
Ratios
w
Winding ratio
Lk/D
Degree of slimness
Statics load
tau k0
Corrected shearing stress at F0
N/mm²
tau k1
Corrected shearing stress at F1
N/mm²
tau k2
Corrected shearing stress at F2
N/mm²
tau kn
Corrected shearing stress at Fn
N/mm²
tau k2 / tau zul
Ratio
tau kn / tau zul
Ratio
Gutekunst Federn
· Carl-Zeiss-Strasse 15 · D-72555 Metzingen
Phone
0049 71 23 9 60-0 · Fax
0049 71 23 9 60-195
service@gutekunst-co.com
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