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Spring calculation

Material  
Loop shape 1 LH 1 Non-elastic coils mm Loop shape 2 LH 2 mm Non-elastic coils m 1 m 2                 mm mm
d Di De (mm) (N) (N) (N) F0 F1 F2 s1 s2 (mm) (mm) (mm) (N/mm) (mm) (mm) R L0 L1                       L2 (mm)   n   (mm) Calculation pre-settings


F1L1s1F2L2s2FnLnsnL0DhmdDeDLkRF0LhLh
For an explanation of the symbols used, please move the mouse pointer over the required symbol in the graphic.
Extension spring - calculation - information - english - Gutekunst Federn
  information extension spring calculation
This spring design program was created on the basis of the German standard for springs as well as our experience in production engineering. The computation can be carried out for compression, extension and torsion springs. The procedures use the same input logic typical for Windows, i.e. via keyboard and mouse.

No warranty is accepted for calculation results outside the production at "Gutekunst Federn".

  pre-setting extension spring calculation

Material, quality category as per DIN 2097, 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.:
 Material, De or Di, F2, R
 Material, De or Di, F2, R, L0
 Material, De or Di, F2, s2
 Material, De or Di, F2, s2, F1 or s1
 Material, De or Di, F2, L2, L0
 Material, De or Di, F2, L2, F1 or L1
 Material, d, De or Di, L0, L2, n

 material properties

 Designation,
 Material-description
Max. operating
temp
.
EN F
(AFNOR)
GB
(BS)
S
(SIS)
USA
(AISI)
G-module
EN 10270-1 type SM
Spring steel wire
For all common springs
80°C 10270-1 NFA
47-301-76
BS 5216-75 * AMS 5112
81500
EN 10270-1 type SH
Spring steel wire
For all common springs
80°C 10270-1 NFA
47-301-76
BS 5216-75 * AMS 5112
81500
EN 10270-1 type SH and DH
Spring steel wire
For all common springs
80°C 10270-1 NFA
47-301-76
BS 5216-75 * AMS 5112
81500
EN 10270-2 / VDC (unalloyed)
Valve spring wire
In high dynamical stress
80°C 10270-2 * * * *
79500
EN 10270-2 / VDSiCr (alloyed)
Valve spring wire
In high dynamical stress between 80 and 120° C
120°C 10270-2 * 2803 685A55HD * 6150
81500
1.4310 / X10CrNi188
Stainless steel V2A
High corrosion resistance
270°C 10270-3 Z12CN17.07 301S21 2330 302
73000
1.4568 / X7CrNiAI17-7
Spring steel V4A
Minimal relaxation, high dynamical stress
350°C 10270-3 Z8CNA17.07.01 301S81 2388 631
78000
CW507L / CuZn36
Copper wire
Non-magnetic, salt-water proof
60°C 12166 * * * *
35000
CW452K / CuSn6
Bronze alloy
Non-magnetic, solderable, weldable, corrosion resistant
60°C 12166 * * * *
39000

 loop shapes

When making your selection, please note the constructional limitations of certain loop shapes.
< Lh > = distance of inner edge of loop from the spring body (mm)
< Di > = inner coil diameter (mm)

1/1 German loop
Make input for "Lh" and "m"
(Lh = 0,8 up to 1,1 Di)
1/1 douple German loop
Make input for "Lh"
(Lh = 0,8 up to 1,1 Di)
1/1 German side loop
Make input for "m"
(Lh ~ Di)
1/1 double German side loop
No more input
(Lh ~ Di)
1/1 German loop, aslant
Make input for "m"
1/2 German loop
Make input for "Lh" and "m"
(Lh = 0,55 up to 0,8 Di)
English loop
Make input for"m"
(Lh ~ 1,1 Di)
Hook
no constructional limitation
Extended side hook
no constructional limitation
Coiled-in hook
no constructional limitation
Screwed plug
no constructional limitation
Screwed
no constructional limitation
Screwed-in shackle
no constructional limitation
   

  You have 4 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)

 calculation according to dimension
In this case for a better overview, only the windows for the calculation according to dimensions are available.


 d = wire diameter (mm)
 Di = inner coil diameter (mm)
 De = outer coil diameter (mm)
 F0 = initial tension (N)
 L0 = unstressed spring length (mm)
 L1 = prestressed spring length (mm)
 L2 = loaded spring length (mm)
 n = number of coils (pc.)


  result page compression spring calculation

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 EN 10218-2 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.


  print / inquire / search

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 catalogue > 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
order@gutekunst-co.com


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