Volume 2, Issue 1, 2011, Full Text - 5th International Conference on ...

Sustainable Construction and Design <strong>2011</strong>
These calculations does already exist but the aim is to sort out the correct one between several parameters
(Ra, Rz…) and directions effects. From the different values of Ra and Rz correlation cannot be made to
make a certain surface. Fig 10. and Fig 11. show the results of different grinded steel plates in parallel and
perpendicular directions. As you can see there is difference in the values of Ra and Rz between the
perpendicular and the parallel measurements. Measurements parallel of the machining has less influence
so the difference rather belongs to the results from the measurements in the perpendicular direction (Fig.
12).
Table 3. Relationships between the surface parameters.
Unknown
parameters
R a
R a
R z
Measured
parameters
R z
R q
R q
Border
Rz
R
a
=
7,5
Rq
R
a
=
1,4
Rq
R
z
=
0,3
= 4 ⋅ R
R z R a z a
R q R a q a
R
R
= 1 ⋅ R
= 0 , 15 ⋅ R
R q R z q
z
R
R oughness - R z (µm) a
7
6
5
4
3
2
1
0
1st sample
3rd sample
2nd sample
4th sample
0 0.2 0.4 0.6 0.8 1
Roughness - Ra (µm)
Fig. 10. Different grinding samples
(perpendicular of feed).
R oughness - R z (µm) a
4
3.5
3
2.5
2
1.5
1
0.5
0
1st sample
3rd sample
2nd sample
4th sample
0 0.1 0.2 0.3 0.4 0.5 0.6
Roughness - Ra (µm)
Fig. 11. Different grinding samples
(parallel of feed).
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