| Author |
Message |
bigmouth
Guest
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 Posted:
Mon Dec 13, 2004 8:31 am Post subject:
unfolding sheetmetal |
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We are messing around with unfolding sheet metal parts. One problem we are
encountering is that the unfolded parts are not workable. The stretch that
happen during bending is different from what wildfire calculates. we have
used different bend allowance table and k facters ... but still the bend
allowance/ stretch are off. Usually when we calculate stretch at the shop
for stainless steel we use 1.6 X thickness and that give us a very accurate
stretch. Where can we find info on how to get wildfire 2 to unfold with the
correct stretch/bend allowance?
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Guest
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| Posted:
Thu Dec 23, 2004 1:22 am Post subject:
Re: unfolding sheetmetal |
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bigmouth wrote:
| Quote: | We are messing around with unfolding sheet metal parts. One problem
we are
encountering is that the unfolded parts are not workable. The
stretch that
happen during bending is different from what wildfire calculates. we
have
used different bend allowance table and k facters ... but still the
bend
allowance/ stretch are off. Usually when we calculate stretch at the
shop
for stainless steel we use 1.6 X thickness and that give us a very
accurate
stretch. Where can we find info on how to get wildfire 2 to unfold
with the
correct stretch/bend allowance?
|
I've had the same problem and have had to resort to assigning each wall
to look at a specified bend table. Even then, I've had to go back and
double check each developed length to make sure. Generally a few still
aren't right and reassigning the DL to "return to driven" will get it
right.
Personally I think that PTC has really screwed up the Sheet Metal
module.
Marty |
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J. Perry
Guest
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| Posted:
Thu Dec 23, 2004 8:16 pm Post subject:
Re: unfolding sheetmetal |
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<hangdog109@hotmail.com> wrote in message
news:1103746927.897319.301110@c13g2000cwb.googlegroups.com...
| Quote: | bigmouth wrote:
We are messing around with unfolding sheet metal parts. One problem
we are
encountering is that the unfolded parts are not workable. The
stretch that
happen during bending is different from what wildfire calculates. we
have
used different bend allowance table and k facters ... but still the
bend
allowance/ stretch are off. Usually when we calculate stretch at the
shop
for stainless steel we use 1.6 X thickness and that give us a very
accurate
stretch. Where can we find info on how to get wildfire 2 to unfold
with the
correct stretch/bend allowance?
I've had the same problem and have had to resort to assigning each wall
to look at a specified bend table. Even then, I've had to go back and
double check each developed length to make sure. Generally a few still
aren't right and reassigning the DL to "return to driven" will get it
right.
Personally I think that PTC has really screwed up the Sheet Metal
module.
Marty
|
There's still no ability to pattern a Flat Wall, Flange Wall and certain
other types of Wall features. I would like to have the ability to perform an
Unbend Sel on an Unattached Wall feature that is in its formed state when
there are other Unattached Wall features present in the model. Of all the
Pro/ENGINEER modules that we use regularly, Pro/SHEETMETAL needs the most
improvement for the types of parts that we design
and manufacture.
J. Perry
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J. Perry
Guest
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| Posted:
Thu Dec 23, 2004 8:53 pm Post subject:
Re: unfolding sheetmetal |
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"J. Perry" <j_perry@musicians.net> wrote in message
news:10sloavjgqo3a99@corp.supernews.com...
| Quote: | hangdog109@hotmail.com> wrote in message
news:1103746927.897319.301110@c13g2000cwb.googlegroups.com...
bigmouth wrote:
We are messing around with unfolding sheet metal parts. One problem
we are
encountering is that the unfolded parts are not workable. The
stretch that
happen during bending is different from what wildfire calculates. we
have
used different bend allowance table and k facters ... but still the
bend
allowance/ stretch are off. Usually when we calculate stretch at the
shop
for stainless steel we use 1.6 X thickness and that give us a very
accurate
stretch. Where can we find info on how to get wildfire 2 to unfold
with the
correct stretch/bend allowance?
I've had the same problem and have had to resort to assigning each wall
to look at a specified bend table. Even then, I've had to go back and
double check each developed length to make sure. Generally a few still
aren't right and reassigning the DL to "return to driven" will get it
right.
Personally I think that PTC has really screwed up the Sheet Metal
module.
Marty
There's still no ability to pattern a Flat Wall, Flange Wall and certain
other types of Wall features. I would like to have the ability to perform
an
Unbend Sel on an Unattached Wall feature that is in its formed state when
there are other Unattached Wall features present in the model. Of all the
Pro/ENGINEER modules that we use regularly, Pro/SHEETMETAL needs the most
improvement for the types of parts that we design
and manufacture.
J. Perry
|
To clarify the Unbend Sel request, I am referring to models that contain
multiple Unattached Wall features that are not yet connected with Merge Wall
features.
J. Perry |
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CKERIDES
Guest
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| Posted:
Fri Dec 24, 2004 4:04 am Post subject:
Re: unfolding sheetmetal |
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| Quote: | I've had the same problem and have had to resort to assigning each wall
to look at a specified bend table. Even then, I've had to go back and
double check each developed length to make sure. Generally a few still
aren't right and reassigning the DL to "return to driven" will get it
right.
Not sure why they don't allow a user assigned value that isn't related or |
effected by a radius or mtl thickness change. In other words, select a
wall/bend and assign a bend deduction value for it that isn't associated with a
bend table - I believe SW has this capability |
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Brooke
Guest
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| Posted:
Fri Dec 24, 2004 5:45 am Post subject:
Re: unfolding sheetmetal |
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The easiest way to get the correct flat layout is to calculate what the
actual inside bend radius will be in fabrication and then create the model
using the actual inside bend radius. As long as the neutral axis in the
sheet metal setup is .44 (44% of material thickness) then the flat will be
correct. It is easy to calculate the actual inside bend radius as long as
the type of forming, material thickness, material type, die width, and punch
radius are known. You can also calculate the tonnage required, which can be
very important, especially if you have limited bending capabilities. If the
equipment doesn't have enough tonnage to form a particular part then a
larger v-die can be used to reduce the tonnage required, but a larger die
width will also increase the inside bend radius, which will result in a
larger bend deduction, which will ultimately reduce the size of the flat
blank.
I never use bend tables and I have done many process capability studies
to verify my calculations, and there are very accurate.
There is also another factor that will effect the inside bend radius on
aluminum and it is the grain direction. I did studies and found a happy
medium which works well...
Bye
"CKERIDES" <ckerides@aol.com> wrote in message
news:20041223180425.12369.00002387@mb-m28.aol.com...
| Quote: | I've had the same problem and have had to resort to assigning each wall
to look at a specified bend table. Even then, I've had to go back and
double check each developed length to make sure. Generally a few still
aren't right and reassigning the DL to "return to driven" will get it
right.
Not sure why they don't allow a user assigned value that isn't related or
effected by a radius or mtl thickness change. In other words, select a
wall/bend and assign a bend deduction value for it that isn't associated
with a
bend table - I believe SW has this capability
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