KISSsoft Tutorial:
Bolt lection and rating according to VDI guideline 2230 __________________________________________________________________________________________ For relea 03/2008
Last modification 25.03.2008 16:07:00
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1Starting KISSsoft
1.1Starting the software
Start KISSsoft using …Start/Programme/KISSsoft 03-2008/KISSsoft“. The following window will appear:
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Figure 1.1-1; Start KISSsoft, KISSsoft main window
1.2Select Calculation
Using the Module tree window Tab “Modules”, lect the bolt analysis
Figure 1.2-1; Selecting the bolt analysis
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2Calculation of a flanged connection 2.1Task description
Sizing and rating of the bolting for a flanged coupling with data as shown:
Torque to be transmitted 13kNm
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Pitch diameter 258mm
Number of bolts on pitch circle 12
Material flange (left/right) GG25/34CrNiMo6 Thickness flange(left/right) 22mm/18mm Surface flange (left/right) N7/N8 Coefficient of friction 0.15 Minimal axial force 0kN Maximum axial force 10kN Strength class of bolt 10.9 Hexagon head screw with shank (AB) ISO4014
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Tightening: with dynamometric key
The connection realid with through bolts (notation according VDI 2230:2003 bolted joint) with nuts and washer under nuts and under bolt head.
This basic data is entered as follows:
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Figure 2.1-1; Input of known data, lection of calculation method
2.2Proposal for a nsible bolt diameter
After having defined the loads acting and the type/strength of the bolt, the sizing button can be ud in order to have the software proposing a suitable bolt diameter. This proposal is bad on a simplified method as described in VDI guideline 2230, table 7. This methods tends to result in over-dimensioned bolts, experience shows that the minimal permissible bolt diameter is one to two sizes lower. Note the message issued once the sizing button is presd.
Figure 2.2-1; Using the sizing button will result in a proposal for the bolt diameter (bad on VDI2230), here, M18
Figure 2.2-2; Message indicating that the resulting bolt diameter may be to large
The nominal bolt diameter can be changed manually, here to 16mm.
Figure 2.2-3; Nominal bolt diameter t to 16mm
2.3Definition of washer and nut
Under the tab ‘Basic data’the ttings for the washer and the nut can be t as follows:
Figure 2.3-1; Call of program module definition
Choo nut from standard or define own geometry Defining the washer (once for the washer underneath the
nut, once for underneath the bolt head). Choo from
standard or define own geometry.
Figure 2.3-2; Detailed input on nut, washer and flange geometry
2.4Definition of clamped parts
In the tab …Clamped parts“ is presd to get a window where all clamped parts (all parts of the connection except for the bolt itlf) can be defined. Since a circular flange is calculated, the software recommends – by issuing a respective message – to define the clamped parts as gments of a ring.
Figure 2.4-1; advice: by calculation of flange connection define of “gments of annulus”
Definition of Bore
geometrical
definition of the
gment of annulus
Choice of the type
here “gment of
annulus”
Input of material and
depth of layer
add a new depth of
layer: “+”
deled depth of layer:
“-“
clear all: “x”
Application of force
is according to figure
SV3 (U …i“ button
for figures)
Figure 2.4-2; Definitionen of the clamped parts
Detailing the through hole. A hole diameter may be defined
using “Own definition” in “Standard”. Input diameter in
field “Diameter”
Information on outer and inner diameter of flange, pitch
diameter and bolt pitch (calculate uing sizing button) Figure 2.4-3; Detailed input
2.5Definition of the bolt
The spesifications for the bolt could be defined in the tab “basic data”. The length can be calculated using the sizing button (then, the smallest possible length is calculated, using nominal
bolt lengths) or can be defined manually. The definition of the connection is now completed and may be viewed in the graphic below:
Figure 2.5-1; Calculation or definition of bolt length
Figure 2.5-2; Connection with flange, bolt, washers and nut
3Calculation and results
3.1Execution of analysis, reports
The analysis is executed using “Ó” (or F5). The most important results are shown in the lower portion of the main window. Using the button to the right of “Ó” (or F6) a report containing all
input data, analysis parameters, and results is written. From the report back to the calculation
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