KISSsoft · root stresses for cylindrical gears (with straight ... New calculation method DIN 31652...

Reseller Meeting 20171

KISSsoft

New features 2017

KISSsoft AG


Topics

1. Gears

▪ Tooth root stresses by FE

▪ Gear body deformation

▪ Plastics manager

▪ Profile modifications with grinding worms / dressing wheels

2. Shafts

▪ Shafts sizing

▪ Load spectra with temperature

▪ Forced vibration

3. Rolling bearings

▪ Fine sizing of bearings

▪ Elastic deformation of inner / outer rings

▪ Inner geometry of thrust needle bearing

4. Various

▪ Database

▪ Journal bearing

▪ Splines

▪ Bolts

▪ Springs

▪ FKM Guideline


▪ Using 2D FEM, you can calculate the tooth

root stresses for cylindrical gears (with straight

or helical teeth)

▪ This is of special interest for the rating of

grinding notches in the tooth root

Gears

Tooth root stresses by FE


▪ Either by selecting the

stiffness files directly

▪ Or by adding them to the

respective shaft calculation

▪ Supported stiffness matrix:

Code Aster, Ansys, Abaqus,

Altair OptiStruct

▪ Supported by pair, 3-gear-

chain, 4-gear-chain and

planet calculation

Gears

Gear body deformation

Can be considered by contact analysis (Cylindrical and Planet) and face load factor calculation.


Gears

Functionality

▪ Adding new plastic materials to the KS database

▪ Automatic generation of the corresponding DAT files

If fatigue data from gear testing is available

▪ Calculation of permissible tooth root/flank stresses

▪ Statistical evaluation of cycles to failure

2 calculation cases possible

▪ Identical test gears for all tests (testing on the test bench)

▪ Different test gears used (Z12, Z14, Z15, Z16) – mainly testing in

actual applications

Possible to calculate wear factors and heat transfer coeffcients acc. to

the VDI 2736

Plastics Manager


Gears

The results from test rig are used in KISSsoft to generate the

material data file

Results from gear tests


▪ You can check whether a required tip relief

can be generated with an available grinding

worm / dressing wheel.

▪ For this check, the system lists all available

grinding worms / dressing wheels from a

user-defined file.

▪ It then displays the grinding worms / dressing

wheels that are suitable in a table and shows

the manufactured tip relief for the current

gear.

Gears

Profile modifications with grinding worms / dressing wheels

Source: Dr. Kaiser


▪ Shaft sizing

▪ equivalent stress

▪ outer contour (length/diameter)

▪ Bearing lifetime

▪ catalogue method

▪ collision detection

Shafts

Rough sizing (single shafts)


Shafts

Examples of rough sizing (single shafts)


Shafts

Load spectra with temperature

▪ Thermal expansion of shafts (affects reaction forces)

▪ Operating clearance of bearings (inner geometry) bending line ...


Shafts

Forced vibration

▪ The vibration of the shaft is calculated on the basis of the unbalance response

▪ The eccentric mass is defined as an additional mass

▪ The amplitudes etc. are evaluated at documentation points which can be positioned at any point on

the shaft.


▪ You can use variation calculation to

optimize the internal geometry of

bearings.

▪ The variants are displayed in a list, or

graphically

Rolling bearings

Fine sizing of inner geometry


▪ Elastic deformation of inner and outer ring

due to external loads

▪ typical application planet bearings

▪ arbitrary boundary conditions possible

(point/line load, elastic/fixed support)

Rolling bearings

Elastic deformation of inner / outer ring


▪ At a given axial position of a connecting

element, both shafts should have had some

geometry definition. However, this was not

realistic for thrust connections, and is

changed now.

▪ In addition, thrust needle cage bearings are

now available with inner geometry.

Rolling bearings

Inner geometry of thrust needle bearing


Various

Oil data in the database

▪ New data for oils and greases added from Interflon

▪ Oil data from Klüber updated

Bearing data in the database actualized from:

▪ SKF

▪ Schaeffler (INA, FAG)

▪ TIMKEN

▪ KOYO

New bearing types in the database from different manufacturer:

▪ TIMKEN: deep groove ball bearings (single row), thrust sperical roller bearings

▪ SKF: hybrid deep groove ball bearings, hybrid cylindrical roller bearings (one row)

▪ INA: Axial angular contact ball bearings

Database


▪ Negative speed (counterclockwise) is

possible to input (only important for the

stiffness calculation – position of the reacting

force on the shaft)

▪ New calculation method DIN 31652:2017 for

radial journal bearings:

▪ for low speed bearings (So > 1)

▪ for bearings with circumferential angle

180°or 360° shells

▪ with formulas, that we don’t have to

read the values from a diagram or

iterate from a table.

▪ possible relations B/d from 0.001 to 5

Various

Journal bearings


▪ Strength calculation according AGMA 6123:

▪ Additional calculation to the release 2016:

- influence of the misalignment and crowning

- calculation to check the ring bursting

▪ update to AGMA 6123-C16:

▪ main change is that the allowable torque rating Ta is calculated with the surface

hardness, in the old standard was this value calculated with the core hardness.

Various

Splines


▪ Additional parameters in the graphic ‘Clamping’ and additional information in the graphic

‘Pretension’ if you input both tightening torque.

Various

Bolts


Compression springs

▪ Standard actualized DIN EN 13906-1:2013

▪ Tolerance quality standard list splitted in 2 lists one for the geometry values and one for the forces

Leg springs

▪ Standard actualized DIN EN 13906-3:2014

Formulas for the diameter Dd and Dh (with working mandrel or working bush)

Formulas for the angle and ’ changed (additional rotation angle)

Compression / Tension / Leg springs

▪ Some wire diameter tolerances added/ updated:

▪ Diameter tolerances according DIN EN 10218:2012 T1-T5

and DIN EN 10270-3 T12-T15 added

▪ Material data actualized to the current standards

Various

Springs


Various

Shaft calculation

▪ FKM-guideline chapter 5.5 is integrated. In the strength calculation according FKM you have for

surface treated components only a global surface treatment factor. According the chapter 5.5 you

have an more detailed method to give an estimation for fatigue limit for surface treated components.

In this method you look about 2 Points:

▪ point on the surface RS

▪ point in the interior of the component at

the transitation between the surface

layer and the core.

For both points are the local elastic stresses to determine

(calculate the local stresses according FKM). With the input

of the surface hardness and the hardness depth or the tensile

strength (the hardness can be convert with this value).The utilization

at this 2 points should be smaller than 1, the bigger one is the

result of this theory.

FKM Guideline


Thank you!

Any Questions?

KISSsoft AG

Reseller Meeting

April 2017

KISSsoft · root stresses for cylindrical gears (with straight ... New calculation method DIN 31652...

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