Calculation Example Parallel Keys According to DIN 6892 Release July 2013 c 2013 GWJ Technology GmbH Rebenring 31 38106 Braunschweig Tel.: +49 (0) 531 129 399-0 www.eAssistant.eu Contents 0.1 Calculation Example: Parallel Key According to DIN 6892 0.1.1 Start the Calculation Module . . . . . . . . . . 0.1.2 Calculation Example . . . . . . . . . . . . . . . 0.1.3 Start the Calculation . . . . . . . . . . . . . . . 0.1.4 Calculation Method B . . . . . . . . . . . . . . 0.1.5 Calculation Results . . . . . . . . . . . . . . . . 0.1.6 Documentation: Calculation Report . . . . . . . 0.1.7 How to Save the Calculation . . . . . . . . . . . 2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 3 3 3 4 6 8 9 0.1. Calculation Example: Parallel Key According to DIN 6892 0.1 0.1.1 3 Calculation Example: Parallel Key According to DIN 6892 Start the Calculation Module Please login with your username and your password. Select the module `Parallel key' through the tree structure of the project manager by double-clicking on the module or clicking on the button `New calculation'. 0.1.2 Calculation Example A strength calculation for the following shaft-hub-connection is required (see also DIN 6892, Example E.2). Enter the following values into the input elds: Shaft diameter Application factor Outer diameter hub D2 Calculation method Operation nominal torque Tnom Min. frictional torque TRmin Max. load peak torque Tmax Load peaks NL Material shaft Material hub Parallel key Material parallel key Standard length parallel key Number of parallel keys Inputs Method B: = 60 mm = 1.75 = 120 mm =B = 1.950 Nm = 1.250 Nm = 3.900 Nm = 500 = C45 hardened and tempered = 34CrNiMo6 hardened and tempered = DIN 6885.1 AB 18 x 11 x 100 = 34CrNiMo6 hardened and tempered = 100 mm =1 Kind of load Changes of load direction Max. reverse torque TmaxRev Small outer diameter D1 Large outer diameter D2 Width of hub within ltr Axial distance a0 Chamfer/radius on shaft keyway edge s1 Chamfer/radius on shaft keyway edge s2 0.1.3 = Alternating torque with a slow torque increase = 106 = 3900 Nm = 120 mm = 120 mm = 91 mm = 45.5 mm = 1.0 mm = 1.0 mm Start the Calculation Please start to enter the values into the input eld. All important calculation results will be calculated during every input and will be displayed in the result panel. A recalculation occurs after every data input. During the input of the values it can happen that the results will be marked in red. Nevertheless, please continue to input the data as usual. For the load peaks NL , please select the entry `User dened input' from the listbox. Enter the the value `500' into the adjacent input eld. Figure 1: Input of the values www.eAssistant.eu 0.1. Calculation Example: Parallel Key According to DIN 6892 0.1.4 4 Calculation Method B The direction of the torque is reversed and a rough calculation according to Method C is not possible. It is recommended to use the calculation method B. Select the calculation method B from the listbox and click the button `Input data method B`. Figure 2: Calculation method B Clicking this button opens the window `Input data method B' and allows you to enter the other input values. Figure 3: Calculation method B If, at a later time, you need to change certain values, then click the button `Input data method B' and the input mask will open again. Hinweis: Input Values for Shaft and Hub Specify the material for the shaft and the hub. The material for the shaft is `C45 hardened and tempered'. The required material for the hub is `34CrNiMo6 hardened and tempered'. Both materials can be selected from the listbox. Figure 4: Material selection for shaft and hub Select the material either from the listbox or click the button `Material' to open the material database. The database allows you to choose the material. You also get detailed information on the kind of material, hardness factor fH , yield point as well as support factor fS . www.eAssistant.eu 0.1. Calculation Example: Parallel Key According to DIN 6892 5 Input Values for Parallel Key The parallel key selection according to DIN 6885 sheet 1 to 3 makes it easier to choose the required parallel key. You can also select the geometry and size of the parallel key. The database also provides the standard lengths of the parallel keys. The dimensions of the parallel key are as follows: DIN 6885.1 AB 18 x 11 x 100 Standard Length In order to dene the standard length of the parallel key, select the value `100' from the listbox. Figure 5: Standard length Selection of the Parallel Key Geometry Click on the button `Parallel key' to select the shape of the parallel key. Figure 6: Button `Parallel key' The geometry selection shows the suitable parallel key. Select the parallel key geometry `DIN 6885 sheet 1-8/1968' as well the shape `AB' from the listbox. Click the button `OK' to conrm the values. Figure 7: Selection dialog for the parallel key www.eAssistant.eu 0.1. Calculation Example: Parallel Key According to DIN 6892 6 Selection of Material Select the material `34CrNiMo6 hardened and tempered' from the listbox. If you need further information on the material, click the button `Material' to open the material database. Figure 8: Material for parallel key Supporting Length and Number of Parallel Keys The supporting length ltr is determined automatically from the selected standard length. You can use the listbox to select the number of parallel keys. For our calculation example we specify one parallel key. Figure 9: Supporting length and number of parallel key 0.1.5 Calculation Results All important calculation results, such as the safeties for the operation load or at the maximum load for all three components (shaft, hub and parallel key) or the equivalent pressure will be calculated during every input and will be displayed in the result panel. A recalculation occurs after every data input. Any changes that are made to the user interface take eect immediately. You will get the results for the equivalent pressure and for the pressure at load peak as well as the safety at operation load and the safety at peak load. Figure 10: Calculation results In our calculation example the safeties for the shaft, the hub and the parallel key are marked red. That means the minimum safeties are not fullled. In addition, you get also an appropriate message in the message window. The parallel key is not suitable for our calculation example. Figure 11: Message window www.eAssistant.eu 0.1. Calculation Example: Parallel Key According to DIN 6892 7 Minimum Safety: Dimensioning of the Shaft Diameter Use the automatic dimensioning function (calculator button) in order to determine the shaft diameter. With just one click, the program automatically determines the shaft diameter so that the required minimum safety of `1.2' will be fullled. In order to do so, please click the calculator button next to the input eld of the shaft diameter. Figure 12: Dimensioning button for the shaft diameter Now the new shaft diameter is determined. Figure 13: New shaft diameter The shaft diameter is now d = 111.88 mm. With this diameter the minimum safety of `1.2' is achieved and the parallel key is suitable for this application. The safety can even be increased by selecting another material. Figure 14: Calculation result Due to the new dimensioning, the shaft diameter is signicantly larger now. A new size of the parallel key was determined automatically. Click the button `Parallel key' and the larger parallel key is displayed automatically. Figure 15: New parallel key www.eAssistant.eu 0.1. Calculation Example: Parallel Key According to DIN 6892 0.1.6 8 Documentation: Calculation Report Use the button `Report' to generate the calculation report very fast. This report contains the calculation method, all input values as well as the detailed results. Figure 16: Button `Report' 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 gures. 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. Figure 17: Calculation report You may also print or save the calculation report: - To save the report in the HTML format, please select `File' → `Save as' from your browser menu bar. Select the le type `Webpage complete', then just click on the button `Save'. - If you click on the symbol `Print', then you can print the report very easily. - If you click on the symbol `PDF', then the report appears in the PDF format. If you right-click on the PDF symbol, you should see the `Save Target As' option. Click on that option and you will see the dialog box for saving the report. www.eAssistant.eu 0.1. Calculation Example: Parallel Key According to DIN 6892 0.1.7 9 How to Save the Calculation When the calculation is nished, you can save it to your computer or to the eAssistant server. Click on the button `Save'. Figure 18: Button `Save' Before you can save the calculation to your computer, you need to activate the checkbox `Enable save data local' in the project manager and the option `Local' in the calculation module. A standard Windows dialog for saving les will appear. Now you will be able to save the calculation to your computer. Figure 19: Windows dialog for saving the le In case you do not activate the option in order to save your les locally, then a new window is opened and you can save the calculation to the eAssistant server. Please enter a name into the input eld `Filename' and click on the button `Save'. Then click on the button `Refresh' in the project manager. Your saved calculation le is displayed in the window `Files'. Figure 20: Save the calculation 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 by phone +49 (0) 531 129 399-0 or email www.eAssistant.eu eAssistant@gwj.de.
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