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Question 11
We have noticed
that when initiating a machine stop (e.g. triggered by tool monitoring) the
machine is no longer coming to an immediate standstill. The upper section of the
tool runs into the lower section two or even three times before the machine
stops. Mispitching can lead to the strip stock accumulated in the punching tool
causing punch breakage. What can we do to counter this? Do we have to replace
the brake and clutch unit? |
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Answer
A certain brake angle is entirely normal at high
speeds. However, if the brake angle rises above that
indicated in the diagram (see Operating
Instructions/Manual) the brake linings might be
oiled-up. In this case, please contact our Service
Department.
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Question 12
We optimise our
tools at speeds around 250 spm. Subsequent operating speed is 750 spm. At full
speed, the display is indicating a change in feed length (BBV 202) of approx. +
0.15 mm. Why is the previously set feed length changing by this amount? |
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Answer
During feeding, acceleration rates rise in
accordance with increases in spm/rpm. The actual
factor of increase is ninefold. (see also Question 8)
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Question 13
On BRUDERER
punching presses, the ram guiding system is located exclusively at strip level.
Punching presses by other manufacturers feature guiding systems below and above
strip level. Does the location of the ram guiding system affect tool life? |
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Answer
Yes – locating the ram guides at strip level has a
significant effect on tool life. As the guides are
located at strip level, the tilt angle of the punch
is also at strip level. This significantly reduces
wear on the tool – even in the case of eccentric
load – and extends tool life.
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Question 14
How often should
the oil level of the shock absorbers be checked or the oil changed? |
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Answer
As long as the machine does not run at resonance
stroke rate (150 spm) in standard punching mode, the
shock absorbers will not need to be checked
regularly and are in this respect also
maintenance-free.
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Question 15
Where the design
of punching tools is concerned, what do we need to be aware of in respect of
eccentric loads on punching presses (BSTA 800-145B)? Can stamping and bending
stations in the punching tool also be located remotely (e.g. away from the two
pressure columns)? |
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Answer
Yes – BSTA presses can support eccentric loads, see
the corresponding diagrams in the Operating
Instructions/Manual. Please contact our Service
Department for more information.
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Question 16
How precisely do
the strip pressure pads and strip guides need to be set on a BBV 190 type strip
feed unit? |
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Answer
These settings need to be adapted individually to
the relevant application and have little to do with
the type of strip feed unit being used. In respect
of strip feeds, please note that settings must be as
precise as possible (in relation to the strip feed
direction). A tolerance of 0.10 mm needs to be
observed between punch strip and strip feed.
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Question 17
What do we need
to be aware of when integrating a rather small punching tool (side length = 500
mm) into a relatively large punching press (BSTA 500-110B) with a tool
installation space of 1100 mm? |
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Answer
In this case you need to ensure an exact strip feed
(vertical & horizontal) between feed and tool in
order to avoid warping of the strip stock prior to
insertion into the tool.
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Question 18
What is the
difference between the insertion depth measurement offered so far in relation to
the analogue ram depth control (eddy current sensors) with distance measurements
in the die? |
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Answer
At the present version of the insertion depth
measurement the position of the ram is measured by a
magnetic tape. Due to the fact that the measuring
system is attached to the ram and the guide support,
only the ram position is measured and not the actual
die position. The new measuring method is very close
to the actual stamping process as the sensors are
mounted in the die itself. Obviously, this improves
the process and parts accuracy.
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Question 19
Is it reasonable
to integrate the insertion depth measurement if the tool is equipped with
mechanical stopper blocks? |
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Answer
The insertion depth measurement at the ram / guide
support has its limits when using tools with stopper
blocks. For this purpose the measurement unit is too
far away from the process (or the stamping die
respectively). With the analogue BRUDERER ram
position control, the distance is measured by means
of eddy current sensors, which are located in the
die. Therefore this system can detect displacements
of the ram in BDC more accurate or stop the machine
in case the set limits are exceeded.
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Question 20
Why is a
relatively large oil circulating quantity necessary for stamping machines? |
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Answer
The heat must be dissipated from the individual
bearings and interior parts of the mechanism. 60% of
the entire power dissipation is through the
lubrication oil. A constant machine temperature is
also essential to achieve optimal process
reliability.
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