BULETINUL INSTITUTULUI POLITEHNIC DIN IAŞI - Universitatea ...

(5)
Bul. Inst . Polit. Iaşi, t. LVI (LX), f. 2, 2010
67
C
d
L
=
L
a
,
The experimental tests were conducted using five lathe tools (Co...C4)
having different values of the main constructive angles, as presented in Table 1.
This table includes also the calculated values for k1... k4 and Cz, Cx, Cy, based on
Eqs.(2) and (3).
Table 1
Lathe tools’ constructive geometry
Lathe
tool
Main constructive geometry
γ λ K α r
[°] [°] [°] [°] [mm]
k1 Values calculated with Eqs. (2) and (3)
k2 k3 k4 Cz Cx Cy Co 0 0 70 10 0 1 0.5 0 0 1 0.47 0.17
C1 -10 0 70 10 0 0.898 0.67 0 0 0.898 0.63 0.23
C2 0 -10 70 10 0 1 0.5 -0.06 -0.16 0.985 0.41 0.33
C3 0 10 70 10 0 1 0.5 0.06 0.16 0.985 0.53 0.01
C4 10 0 70 10 0 1.07 0.32 0 0 1.07 0.3 0.01
The specific working conditions and the experimental results (Fz, Cd, mz)
are presented in Tables 2 – 6. The values of mz were obtained using Eq.(6),
where Cz is according to Table 1 and σo is a steel type characteristic.
(6)
F
zexp
z
L
a
o
=
n
∑
i=
1
L
= C σ t s C
ai
1+
mz
d
Table 2
OL44 – The influences of tool´s geometry and cutting feed
Cut
material/
Tool´s type
σo [daN/
mm 2 ]
t
[mm]
s
[mm/
rev]
n
[rev/
min]
L
[mm]
La
[mm]
D
[mm]
Cd
Fz
[daN]
mz
OL44/ Co 29 2
0.1
0.25
630
630
42.5
42.5
16.52
17.38
58.5
58.5
2.57
2.44
54.9
113.5
1.38
1.30
OL44/ C1 29 2
0.1
0.25
630
630
38.5
38.5
13.03
14.18
53.5
53.5
2.91
2.72
63.4
125.8
1.34
1.27
OL44/ C2 29 2
0.1
0.25
630
630
41.5
41.5
14.25
15.11
57.3
57.3
2.91
2.75
58.16
123.6
1.17
1.14
OL44/ C3 29 2
0.1
0.25
630
630
41.5
41.5
15.22
16.18
57.3
57.3
2.73
2.57
47.9
118.0
1.12
1.24
OL44/ C4 29 2
0.1
0.25
630
630
41.5
41.5
16.47
17.33
57.3
57.3
2.52
2.39
47.65
118.0
1.21
1.32
n.
.