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Please login with your user name and your password. Select the module ‘Compression spring’ through the tree structure of the Project Manager by double-clicking on the module or clicking on the button ‘New calculation’.
The calculation module is opened in a new window.
For the calculation of the compression spring according to DIN EN 13906-1 forces or deflections or a combination of both can be specified for the calculation. Other parameters that describe the compression spring geometry (e.g., length, diameter and coils) can be entered manually or can be selected from the spring geometry database according to DIN 2098. In case you enter the data manually, you can determine individual compression springs. During the input of the manual definition of the spring geometry, the values depending on the entered values are calculated automatically.
For the entry of forces and deflections there are the following possibilities:
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The input fields that depend on each other are color-coded to guide you. When you click on the input field, this input field turns violet. The appropriate input field will turn yellow. It makes it easy for you to see how these values relate to each other and how they change.
Use this function to change the unit of measurement.
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If an axial loaded spring with parallel ends is loaded transversely to its axis, a transversal spring with local stress increase appears (DIN EN 13906-1:2002 (D) p. 280). Consider here the transversal spring. Please enter either force or deflection.
Here the number of active coils 
can be entered manually. The manual entry allows the dimensioning of
individual compression springs. Activate the option ‘unsprung’ and enter a value for the number of unsprung
coils.
Enter a value either for the coils 
or the spring rate 
. The input fields are color-coded, too. For example: In
case you enter a number of active coils, the spring rate is determined automatically and the data
input field turns yellow. In case you define the spring rate, the data input field for the coils turns
yellow.
Please note: Click on the button ‘Options’ in the upper line of the calculation module and consider the
wire diameter tolerances. Select DIN 2076 B/C and DIN 2077. The calculation report contains all
detailed information on the tolerances according to DIN 2095 or DIN 2096 (see section 11.11 ‘The
options’).
Select the following spring end types:
Please note: Move fast within the listbox and select the various end types using the arrow keys ‘Up’ and ‘Down’
on your computer keyboard. The result panel and the diagrams display all changes.
For the support of spring end types the following options are available:
Please note: Select the option ‘Own input’ and enter your own supporting coefficient 
of the spring end
type.
Before you start the calculation, it should be clarified whether the load refers to a dynamic or static/quasi static load. The calculation is possible for both dynamic and static/quasi static load.
Please note: Quasi static load means: Number of load changes 
Please enter here the data for the lengths and diameter. The input fields that are depending on each other are color-coded.
For example: Click on the input field for the length 
, this field turns violet. The lengths 
and 
turn
yellow. Modify 
, then 
and 
change, too.
The calculation module allows to add all values for the compression spring geometry (length, diameter and coils) you already know, but you can also use the spring geometry database according to DIN 2098. The spring geometry selection suggests compression springs. At first, define the loads, then click on the button ‘Spring geometry database’.
The spring geometry database is opened.
The database provides a list of all spring geometries that can be used for your case of application. Please select the compression spring and confirm with the ‘OK’ button.
The spring geometry is taken over now.
The option ‘Show only geometries that are applicable for the entered values.’ is activated by default. If you want to display all geometries, remove the checkmark from its box and select a spring geometry. Confirm with the ‘OK’ button.
Click on the button ‘Material’. The following database provides an extensive material selection. In case you cannot find the required material in the database, you can define your own material.
The material database opens.
Select a material from the list. Further, you will get detailed information on the material.
Please note: Move fast within the listbox and select the material by using the arrow keys ‘Up’ and ‘Down’ on
your computer keyboard. This allows you to browse through the list to view details or to compare different
materials.
Choose the entry ‘User defined’ to define your own material. When you click ‘User defined’, the input fields are enabled so you can fill in your own values.
Then specify the individual material as well add a short comment. Confirm your entries with the ‘OK’ button.
Please note: Please note that by changing the material, your individual definition of a material is
deleted.
Depending on the manufacturing process of the chosen material (e.g. hot-formed rolled or cold-formed), the
calculation of the tolerances is determined according to DIN 2095 or DIN 2096. In addition, the eigenfrequency
of the spring is calculated.
The calculation module contains a message window. You get all information, warnings and hints. For example whether the compression spring is suitable for the case of application. The information will also appear in the calculation report later. After the completion of your calculation, click on the ‘Report’ button to create a calculation report (see section 11.8 ‘The documentation: Calculation report’).
All important calculation results are determined and displayed immediately during the input of your values. After every data input, your result will be calculated again. Click on the button ‘Calculate’, your input data will be confirmed, the results will be calculated and be displayed in the result panel. If you press the ‘ENTER’ or the ‘TAB’ key of your keyboard or click in a different input field, your data will be also confirmed automatically. If the result exceeds certain values, the result will be marked red.
You get a graphical representation of the load-deflection and Goodman diagram. Click on the diagram to see the full image and details.
Please note: The Goodman diagram is displayed only for the dynamic load.
After the completion of your calculation you can create a calculation report. Click on the ‘Report’ button.
The calculation report is opened.
The calculation report contains a table of contents. You can navigate through the report via the table of contents that provides links to the input values, results and figures. The report is available in HTML and PDF format. Calculation reports, saved in HTML format, can be opened in a web browser or in Word for Windows.
‘Save as’ from your browser menu
bar. Select the file type ‘Webpage complete’, then just click on the button ‘Save’.
When the calculation is finished, you can save it either on the eAssistant server or on your own workstation. Click on the ‘Save’ button.
If you have activated the option ‘Enable file save local’ in the Project Manager and the option ‘Local’ in the
calculation module, a standard Windows dialog for saving the file on your workstation appears.
Please note: You must not forget that the calculation module has to be closed to activate the option ‘Enable file save local.’
In case you have not activated this option, a new window is opened and you can save the calculation on the eAssistant server.
Please enter a name into the input field ‘Filename’ and click on the button ‘Save’. Then click on the button ‘Refresh’ in the Project Manager. Your saved calculation file is displayed in the window ‘File’.
The button ´Undo allows you to reset your input to an older state. The button ‘Redo’ reverses the undo.
The button ‘Options’ allows you to change some general settings.
A new window is opened.
Here you can change some general settings. Modify the tolerances for the wire diameter according to DIN 2076 B/C and DIN 2077 as well consider the operating temperature.
Please note: If you would like to change these values permanently, you can save your desired settings as a
‘standard’ file. For further details, please check the ‘General functions’ chapter.
Please login with your user name and your password. Select the module ‘Compression spring’ through the tree structure of the Project Manager by double-clicking on the module or clicking on the button ‘New calculation’.
The calculation module is opened in a new window.
A cold-formed compression spring 4 x 32 x 120 made of patented cold drawn wire
Wire diameter  | = 4 mm |
Diameter  | = 32 mm |
Coils  | = 8.5 |
Length of the unloaded spring  | = 120 mm |
| is alternately loaded with |
Spring force  | = 300 N |
Spring force  | = 500 N |
We are looking for the spring rate 
, the corrected shear stress at spring force 
for 
= 500 N and
spring deviation 
.
Please start to enter the spring forces 
and 
.
During the entry of the spring forces, the corresponding spring deflections are determined and
color-coded.
Enter the number of coils 
as well as the wire diameter 
.
The settings for the spring ends, the support of spring as well the load are not changed.
Enter the spring length 
and the spring diameter 
.
To find the required material for the compression spring, click on the button ‘Material’.
The material selection is opened.
Select the following material from the listbox: patented cold drawn wire DH according to EN 10270-1: 2001, shot
peended, 
.
When you enter the values, the result is determined and displayed immediately. You can find all detailed results
in the result panel.
The spring rate 
is = 9,364 N/mm and is displayed above the input field for the wire diameter.
In order to find the result for the shear stress, click on the ‘Report’ button. The shear stress 
at spring force
is = 636,62 N/mm
.
You will find the value for the spring deviation 
in the result panel. The spring deviation 
is = 21,36
mm.
The results are clearly displayed in the diagrams. Click on the diagram to see the full image and details.
After the completion of your calculation, you can create a calculation report. Click on the ‘Report’ button. You can navigate through the report via the table of contents that provides links to the input values, results and figures. The report is available in HTML and PDF format. Calculation reports, saved in HTML format, can be opened in a web browser or in Word for Windows.
‘Save as’ from your browser menu
bar. Select the file type ‘Webpage complete’, then just click on the button ‘Save’.
When the calculation is finished, you can save it either on the eAssistant server or on your own workstation. Click on the ‘Save’ button.
If you have activated the option ‘Enable file save local’ in the Project Manager and the option ‘Local’ in the
calculation module, a standard Windows dialog for saving the file on your workstation appears.
Please note: You must not forget that the calculation module has to be closed to activate the option ‘Enable file save local.’
In case you have not activated this option, a new window is opened and you can save the calculation on the eAssistant server.
Please enter a name into the input field ‘Filename’ and click on the button ‘Save’. Then click on the button ‘Refresh’ in the Project Manager. Your saved calculation file is displayed in the window ‘File’.
Our manual is improved continually. Of course we are always interested in your opinion, so we would like to know what you think. We appreciate your feedback and we are looking for ideas, suggestions or criticism. If you have anything to say or if you have any questions, please let us know via phone +49 (0) 531 129 399-0 or email eAssistant@gwj.de.
and wire diameter 
