Diabond 2000, Verona 25/26 September Key Factors in the Performance of Sintered Diamond Tools for Stone Sawing L. Risso, M. Pareto, M. Capurro*, L. Gaggero § Centro Sviluppo Materiali Corso Perrone 24/a I-16152 Genova Italy *DEUIM, University of Genoa P.zale Kennedy, Fiera del Mare, Pad. D I-16127 Genova Italy § DIPTERIS, University of Genoa Corso Europa 26 I-16132 Genova
This document is posted to help you gain knowledge. Please leave a comment to let me know what you think about it! Share it to your friends and learn new things together.
Transcript
Diabond 2000, Verona 25/26 September
Key Factors in the Performance of Sintered Diamond Tools for Stone Sawing
L. Risso, M. Pareto, M. Capurro*, L. Gaggero§
Centro Sviluppo MaterialiCorso Perrone 24/aI-16152 GenovaItaly
*DEUIM, University of GenoaP.zale Kennedy, Fiera del Mare, Pad. DI-16127 GenovaItaly
§DIPTERIS, University of GenoaCorso Europa 26I-16132 Genova
Diabond 2000, Verona 25/26 September
STONE
DIAMOND ALLOY
•COMPOSITION
•PETROGRAPHY
•MECHANICAL PROPERTIES
•COMPOSITION
•MICRO-STRUCTURE
•MECHANICALPROPERTIES
•FRIABILITY
•COMPRESSIVESTRENGTH
•STATISTICS
•GANULOMETRYANDMORPHOLOGY
•COLOUR
•INCLUSIONS
•THERMALSTABILITY
•Sawability •Abrasivity
•Retention
•Concentration
PERFORMANCE
Diabond 2000, Verona 25/26 September
NF
T
PP
NIT
ln
..
Toughness indexToughness index
It is conventionally assumed that N is the number of cycles such that PNF= 0.5PT
Diabond 2000, Verona 25/26 September
(*) average value of dispersed results
Measure of TI and TTI for Measure of TI and TTI for different materialsdifferent materials
Diabond 2000, Verona 25/26 September
Crushed grain distribution (mesh)Crushed grain distribution (mesh)
Diabond 2000, Verona 25/26 September
Friabilty of Diamond Mixtures
0
10
20
30
40
50
60
70
80
90
100
110
120
130
140
150
160
0 0,1 0,2 0,3 0,4 0,5 0,6 0,7 0,8 0,9 1
Fraction
F.I.
of
the
Mix
ture
Fi=10; Fj=20
Fi=10; Fj=30
Fi=10; Fj=40
Fi=10; Fj=50
Fi=10; Fj=60
Fi=10; Fj=70
Fi=10; Fj=80
Fi=10; Fj=90
Fi=10; Fj=100
Fi=10; Fj=110
Fi=10; Fj=120
Fi=10; Fj=130
Fi=10; Fj=140
Fi=10; Fj=150
5.0)5.0()5.0()()( Fj
F
Fi
F
P
Pj
P
Pi
Diabond 2000, Verona 25/26 September
Geometrical parameters of the Geometrical parameters of the modelmodel
rr
33
Diabond 2000, Verona 25/26 September
Convergence of Mean Stress and Standard Deviation (SDB 1085)
0
200
400
600
800
1000
1200
1400
0 10 20 30 40 50 60
Number of Data
Me
an
Va
lue
s (
MP
a)
Average of MeanStress
Average ofStand. Dev.
Diabond 2000, Verona 25/26 September
)(1)( cNf eP
Weibull statisticsWeibull statistics
Where Nc is the mean number of defects responsible for fracture at a stresses
dVnNEV
c )()(
Diabond 2000, Verona 25/26 September
n() at different Weibull modulus value
0
0,2
0,4
0,6
0,8
1
0 0,2 0,4 0,6 0,8 1
n(
)V0
m=0
m=
100
m
Vn
00
1)(
Weibull statisticsWeibull statistics
Diabond 2000, Verona 25/26 September
Weibull statisticsWeibull statistics
With the hypothesis of uniform defects distribution ((V)) we obtain: