kisssoft-tut-004-E-bolts.pdf

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KISSsoft 2019 – Tutorial 4
Bolt calculation according to VDI 2230
KISSsoft AG
A Gleason Company
Rosengartenstr. 4, 8608 Bubikon
Switzerland
T. +41 55 254 20 50
F. +41 55 254 20 51
info@KISSsoft.AG
www.KISSsoft.AG
Sharing Knowledge
Contents
1
Starting KISSsoft..................................................................................................................... 3
1.1
1.2
Starting the software ............................................................................................................................... 3
Selecting a calculation ............................................................................................................................ 3
2
Calculation of a flanged connection......................................................................................... 4
2.1
2.2
2.3
2.4
2.5
Task ........................................................................................................................................................ 4
Proposal for a reasonable bolt diameter ................................................................................................. 5
Definition of nuts and washers ................................................................................................................ 5
Definition of clamped parts ...................................................................................................................... 6
Definition of the bolt ................................................................................................................................ 7
3
Analysis and results ................................................................................................................ 9
3.1
3.2
Performing the analysis, report ............................................................................................................... 9
Comments on the results ...................................................................................................................... 11
4
Further Calculations .............................................................................................................. 12
4.1
4.2
4.3
Analysis with a smaller bolt ................................................................................................................... 12
Constraints, settings.............................................................................................................................. 12
FEM calculation comparison Model class III ......................................................................................... 15
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1 Starting KISSsoft
1.1 Starting the software
You can call KISSsoft as soon as the software has been installed and activated. Usually you start the program by
clicking «Start→Program Files→KISSsoft 03-2019→KISSsoft 03-2019. This opens the following KISSsoft user
interface:
Figure 1.
Starting KISSsoft, initial window
1.2 Selecting a calculation
In the Modules tree window, select the
«Modules»
tab to call the bolt calculation module:
Figure 2.
Selecting the «Bolts» calculation module
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2 Calculation of a flanged connection
2.1 Task
Size and verify the bolting for a flanged coupling using the following data:
Torque to be transmitted
Pitch diameter
Number of bolts on pitch circle
Material flange
(left/right)
EN-GJL-250 (GG25)/34CrNiMo6
Thickness flange (left/right)
Flange surface (left/right)
Flange outer diameter
22 mm/18 mm
N7/N8
320 mm
13 kNm
258 mm
12
Flange inner diameter
Coefficient of friction
Axial force lower value
Axial force upper value
Bolt strength class
210 mm
0.15
0 kN
10 kN
10.9
Type: hexagon headed bolt with shank (AB)
EN ISO 4014,
Tightening: with torque wrench
The connection is made using through bolts (notation as specified in VDI 2230:2014 - bolted joint) with nuts, with
washers under the nuts and under the bolt head. If you require a different input unit, click with the right-hand
mouse button on the unit you want to change to open the corresponding selection list. You can then simply select
the unit you want from this list and change the units used in the calculation. Input this data in the
«Basic data»
tab as follows:
Figure 3.
Inputting known data, selecting the calculation method
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2.2 Proposal for a reasonable bolt diameter
After you have defined the load and input the basic data for the bolt, click the
«Sizing button»
in the main
window. The program proposes values for a suitable bolt diameter. This proposal is based on a simplified bolt
layout as specified in VDI 2230:2014. This method usually results in over-dimensioned bolts. Experience shows
that the minimum permitted bolt diameter is often one or two sizes lower! Note the message that appears when
you click the Sizing button. When you click the Sizing button, the software suggest a reference diameter based
on VDI 2230: 2014, in this case, M22.
Figure 4.
Sizing the bolt diameter
Figure 5.
Message indicating that the proposed bolt diameter may be too large
You can reduce the reference diameter to 16mm manually:
Figure 6.
Reference bolt diameter set manually to 16mm
2.3 Definition of nuts and washers
In the
«Basic data»
tab you can now input the data for the nuts and washers:
Figure 7.
Input for washers and nuts
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