Manual
Weld Seam Detection System R4000 SND40
for Tubes, Cans and Drums
System description
B0059001 / Rev. 2.3
14
ROLAND ELECTRONIC GmbH · Otto-Maurer-Str. 17 · DE 75210 Keltern · Phone +49 (0)7236-9392-0 · Fax +49 (0)7236-9392-33
2.3.4 Cycle time and Duration of weld seam detection
Die cycle time is the sum of all times in the course of a weld seam detection. See the chapter
„Sequence of a Weld Seam Detection“- Steps 1 to 8.
Note:
Typically, the cycle time is initially calculated based on the number of units per
minute. If the cycle time is very short, it remains limited time for the individual steps.
The detection time T
D
includes the steps 4 to 6 from „ Sequence of a Weld Seam Detection “.
The influences are:
•
tube diameter
•
rotation speed
•
wall thickness / settling time
•
measuring methods
The following diagram shows the duration of weld seam detection in dependence of the tube
diameter and rotation speed. The settling time T
S
of 1.5 seconds is considered here.
Fig. 2: Duration of weld seam detection in dependency of tube diameter and rotation speed
Note:
Not valid for the type of filter "cross correlation".
To calculate the detection time T
D
for another settling time T
S
use following formulas:
For drives with clamping chucks or cone points:
N
200
T
T
S
D
+
=
T
S
= Settling time of system
N = Number of rotations of the tube [rpm] *
T
D
= Detection time [s]
*
Conversion of the rotation rate from rpm to rps is not required.
For drives:
V
5
,
10
D
T
T
S
D
⋅
+
=
T
S
= Settling time of system
T
D
= Detection time [s]
D = Tube Diameter [mm]
V = Speed [mm/s]
However, the settling time cannot be set arbitrarily small. Following information for orientation:
NS12 sensors:
T
S
> 0.5 s per 1 mm wall thickness
NS9 sensors:
Ts > 0.7s per 1 mm wall thickness
N
um
be
r o
f r
ot
at
io
ns
[R
P
M
]
400
200
100
50
20
10
5
Ti
m
e
re
qu
ire
m
en
t d
et
ec
tio
n
T
[s
ec
.]
D
2,0
2,2
2,5
3,5
5
6,5
11,5
21
40
Work area
Tube diameter [mm]
100
200 250 300
500
1000
5
10
20
30
40 50
70
