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Reinforcement Pads

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Message 1 of 21
enerfab
2626 Views, 20 Replies

Reinforcement Pads

I need to add re-pads at specific nozzle locations on a round pressure vessel in Inventor. Our repads are OD/ID plates with the thickness varying based on code requirements, and vessel pressure. I can create a square shape that would conform to the shell OD, but can't figure out how to create a round shape that would wrap around the shell. Please help!
20 REPLIES 20
Message 2 of 21
Anonymous
in reply to: enerfab

Can you post a picture of what you're trying to achieve?

--
Cheers,

Rob Singlehurst

Quadro4 750XGL 81.64
Athlon XP 2600+
1G RAM
W2K SP4
IV10 SP1

wrote in message news:5050896@discussion.autodesk.com...
I need to add re-pads at specific nozzle locations on a round pressure
vessel in Inventor. Our repads are OD/ID plates with the thickness varying
based on code requirements, and vessel pressure. I can create a square
shape that would conform to the shell OD, but can't figure out how to create
a round shape that would wrap around the shell. Please help!
Message 3 of 21
Anonymous
in reply to: enerfab

wrote in message news:5050896@discussion.autodesk.com...
I need to add re-pads at specific nozzle locations on a round pressure
vessel in Inventor. Our repads are OD/ID plates with the thickness varying
based on code requirements, and vessel pressure. I can create a square
shape that would conform to the shell OD, but can't figure out how to create
a round shape that would wrap around the shell. Please help!

_________________

There's several different ways to model repads, depending on whether you
need to generate flat patterns for manufacturing. When I was doing repads,
the shop had their own formulas for making the things based on a simple
description, so all I had to do was represent them for visuals on the model
and for the BOM. I've got to go do the commute right now, but in a few
hours I'll post some examples, one of which will unfold flat.

Cheers,
Walt
Message 4 of 21
Anonymous
in reply to: enerfab

Example 1...

In past versions, Inventor wouldn't create a flat pattern of a repad made
this way, but I tried it, and R10 will do it. This repad is a reasonably
accurate representation of the real thing, and is good for doing FEA calcs
since the nozzle hole conforms exactly to the nozzle. It's set up so it can
be constrained in place on the shell and nozzle via the two renamed origin
axis (a nice touch; these things can be hard to assemble if they're not made
with that in mind). The only real problem with this method is that the
outer shape is made with fillets, and their dimension has to be a bit less
than half the height of the repad, so there's some trial and error there to
find a value that works. It might be doable with a formula that would work
for most cases. Take a look at the parameters table to get an idea how I
set things up.

Now that this method is unfoldble, it's probably the easiest and best of the
ways I know to make a repad. I'll try to post a few more in a bit, but this
is the method I'd prefer.

Cheers,
Walt
Message 5 of 21
Anonymous
in reply to: enerfab

I'm curious about your re-pad but your zip file won't open?


"Walt Jaquith" wrote in message
news:5051038@discussion.autodesk.com...
Example 1...

In past versions, Inventor wouldn't create a flat pattern of a repad made
this way, but I tried it, and R10 will do it. This repad is a reasonably
accurate representation of the real thing, and is good for doing FEA calcs
since the nozzle hole conforms exactly to the nozzle. It's set up so it can
be constrained in place on the shell and nozzle via the two renamed origin
axis (a nice touch; these things can be hard to assemble if they're not made

with that in mind). The only real problem with this method is that the
outer shape is made with fillets, and their dimension has to be a bit less
than half the height of the repad, so there's some trial and error there to
find a value that works. It might be doable with a formula that would work
for most cases. Take a look at the parameters table to get an idea how I
set things up.

Now that this method is unfoldble, it's probably the easiest and best of the
way
s I know to make a repad. I'll try to post a few more in a bit, but this
is the method I'd prefer.

Cheers,
Walt
Message 6 of 21
Anonymous
in reply to: enerfab

Opens alright here Chris.

--
Cheers,

Rob Singlehurst

Quadro4 750XGL 81.64
Athlon XP 2600+
1G RAM
W2K SP4
IV10 SP1

"Chris D" wrote in message
news:5051137@discussion.autodesk.com...
I'm curious about your re-pad but your zip file won't open?


"Walt Jaquith" wrote in message
news:5051038@discussion.autodesk.com...
Example 1...

In past versions, Inventor wouldn't create a flat pattern of a repad made
this way, but I tried it, and R10 will do it. This repad is a reasonably
accurate representation of the real thing, and is good for doing FEA calcs
since the nozzle hole conforms exactly to the nozzle. It's set up so it can
be constrained in place on the shell and nozzle via the two renamed origin
axis (a nice touch; these things can be hard to assemble if they're not made

with that in mind). The only real problem with this method is that the
outer shape is made with fillets, and their dimension has to be a bit less
than half the height of the repad, so there's some trial and error there to
find a value that works. It might be doable with a formula that would work
for most cases. Take a look at the parameters table to get an idea how I
set things up.

Now that this method is unfoldble, it's probably the easiest and best of the
way
s I know to make a repad. I'll try to post a few more in a bit, but this
is the method I'd prefer.

Cheers,
Walt
Message 7 of 21
StuartMoore
in reply to: enerfab

Didn't open here. Got a 'Server Busy' message and had to restart the mechine to get rid of it.
Message 8 of 21
Anonymous
in reply to: enerfab

"Chris D" wrote in message
news:5051137@discussion.autodesk.com...
I'm curious about your re-pad but your zip file won't open?

I'll repost the file unzipped to the inventor.customer-files group.

Cheers,
Walt
Message 9 of 21
Anonymous
in reply to: enerfab

It works fine, Walt.

Don't waste your time.

QBZ


"Walt Jaquith" wrote in message
news:5051241@discussion.autodesk.com...
"Chris D" wrote in message
news:5051137@discussion.autodesk.com...
I'm curious about your re-pad but your zip file won't open?

I'll repost the file unzipped to the inventor.customer-files group.

Cheers,
Walt
Message 10 of 21
Anonymous
in reply to: enerfab

"Quinn Zander" wrote in message
news:5051270@discussion.autodesk.com...
It works fine, Walt.

Don't waste your time.

QBZ


___________

The server won't accept the post anyway.

Cheers,
Walt
Message 11 of 21
Anonymous
in reply to: enerfab

On Thu, 05 Jan 2006 17:15:25 +0000, Walt Jaquith wrote:

> "Chris D" wrote in message
> news:5051137@discussion.autodesk.com... I'm curious about your re-pad but
> your zip file won't open?
>
> I'll repost the file unzipped to the inventor.customer-files group.
>
> Cheers,
> Walt

Got it to work on my Linux box, sorry about that.

Go figure, the WinPro x64 box said it was corrupt but the Linux box worked
fine, LOL.

---------------

(Chris D is Chris K in this case, forgot to change it on the workstation
since there's already another Chris D)
Message 12 of 21
Anonymous
in reply to: enerfab

Wouldn't a constant 4" surfaced ring thickened be more accurate?

Of course the ID's edges are normal to the repad itself on a thicken and not
a "thru" cut so I went in and replaced the normal ID edge to be true to the
24" ID cylinder so the FEA won't freak out with the resultant (real world??)
gap.

QBZ


"Walt Jaquith" wrote in message
news:5051038@discussion.autodesk.com...
Example 1...

In past versions, Inventor wouldn't create a flat pattern of a repad made
this way, but I tried it, and R10 will do it. This repad is a reasonably
accurate representation of the real thing, and is good for doing FEA calcs
since the nozzle hole conforms exactly to the nozzle. It's set up so it can
be constrained in place on the shell and nozzle via the two renamed origin
axis (a nice touch; these things can be hard to assemble if they're not made

with that in mind). The only real problem with this method is that the
outer shape is made with fillets, and their dimension has to be a bit less
than half the height of the repad, so there's some trial and error there to
find a value that works. It might be doable with a formula that would work
for most cases. Take a look at the parameters table to get an idea how I
set things up.

Now that this method is unfoldble, it's probably the easiest and best of the
way
s I know to make a repad. I'll try to post a few more in a bit, but this
is the method I'd prefer.

Cheers,
Walt
Message 13 of 21
Anonymous
in reply to: enerfab

Yeah, that's another way to do them. The problem with that is that you
can't unfold a part with a thicken feature(at least you couldn't; it was
R6-7 era when I last did a lot of repads). Another is an intersect
extrusion, which if I remember doesn't give a particularly accurate result,
and the fourth is to model it flat and bend it in the sheet metal
environment.

Cheers,
Walt


"Quinn Zander" wrote in message
news:5051495@discussion.autodesk.com...
Wouldn't a constant 4" surfaced ring thickened be more accurate?

Of course the ID's edges are normal to the repad itself on a thicken and not
a "thru" cut so I went in and replaced the normal ID edge to be true to the
24" ID cylinder so the FEA won't freak out with the resultant (real world??)
gap.

QBZ


"Walt Jaquith" wrote in message
news:5051038@discussion.autodesk.com...
Example 1...

In past versions, Inventor wouldn't create a flat pattern of
a repad made
this way, but I tried it, and R10 will do it. This repad is a reasonably
accurate representation of the real thing, and is good for doing FEA calcs
since the nozzle hole conforms exactly to the nozzle. It's set up so it can
be constrained in place on the shell and nozzle via the two renamed origin
axis (a nice touch; these things can be hard to assemble if they're not made

with that in mind). The only real problem with this method is that the
outer shape is made with fillets
, and their dimension has to be a bit less
than half the height of the repad, so there's some trial and error there to
find a value that works. It might be doable with a formula that would work
for most cases. Take a look at the parameters table to get an idea how I
set things up.

Now that this method is unfoldble, it's probably the easiest and best of the
way
s I know to make a repad. I'll try to post a few more in a bit, but this
is the method I'd prefer.

Cheers,
Walt
Message 14 of 21
Anonymous
in reply to: enerfab

Getting a little dangerous now aren't we Quinn. Ever tried converting
that part over to "modeling" and then back again to "sheet metal"?

Quinn Zander wrote:
> Wouldn't a constant 4" surfaced ring thickened be more accurate?
>
> Of course the ID's edges are normal to the repad itself on a thicken and not
> a "thru" cut so I went in and replaced the normal ID edge to be true to the
> 24" ID cylinder so the FEA won't freak out with the resultant (real world??)
> gap.
>
> QBZ
>
>
> "Walt Jaquith" wrote in message
> news:5051038@discussion.autodesk.com...
> Example 1...
>
> In past versions, Inventor wouldn't create a flat pattern of
> a repad made
> this way, but I tried it, and R10 will do it. This repad is a reasonably
> accurate representation of the real thing, and is good for doing FEA calcs
> since the nozzle hole conforms exactly to the nozzle. It's set up so it can
> be constrained in place on the shell and nozzle via the two renamed origin
> axis (a nice touch; these things can be hard to assemble if they're not made
>
> with that in mind). The only real problem with this method is that the
> outer shape is made with fillets
> , and their dimension has to be a bit less
> than half the height of the repad, so there's some trial and error there to
> find a value that works. It might be doable with a formula that would work
> for most cases. Take a look at the parameters table to get an idea how I
> set things up.
>
> Now that this method is unfoldble, it's probably the easiest and best of the
> way
> s I know to make a repad. I'll try to post a few more in a bit, but this
> is the method I'd prefer.
>
> Cheers,
> Walt
Message 15 of 21
Anonymous
in reply to: enerfab

The model I posted has a working flat pattern so at least we can produce
flats from thickened models now.

progress in action.

QBZ


"Walt Jaquith" wrote in message
news:5051671@discussion.autodesk.com...
Yeah, that's another way to do them. The problem with that is that you
can't unfold a part with a thicken feature(at least you couldn't; it was
R6-7 era when I last did a lot of repads). Another is an intersect
extrusion, which if I remember doesn't give a particularly accurate result,
and the fourth is to model it flat and bend it in the sheet metal
environment.

Cheers,
Walt
Message 16 of 21
Anonymous
in reply to: enerfab

Cool! In most cases, it wouldn't matter much if the gap wasn't completely
accurate. I remember going through fits trying to figure out how to do my
first repad. Someone here on the support group helped me out...I forget
who.

Cheers,
Walt

"Quinn Zander" wrote in message
news:5051715@discussion.autodesk.com...
The model I posted has a working flat pattern so at least we can produce
flats from thickened models now.

progress in action.

QBZ


"Walt Jaquith" wrote in message
news:5051671@discussion.autodesk.com...
Yeah, that's another way to do them. The problem with that is that you
can't unfold a part with a thicken feature(at least you couldn't; it was
R6-7 era when I last did a lot of repads). Another is an intersect
extrusion, which if I remember doesn't give a particularly accurate result,
and the fourth is to model it flat and bend it in the sheet metal
environment.

Cheers,
Walt
Message 17 of 21
enerfab
in reply to: enerfab

Thanks for the help. I will post my attempt soon.

Bruce Leonhardt
bruce.leonhardt@enerfab.com
Cincinnati, Ohio
Message 18 of 21
renatodomingues09
in reply to: Anonymous

Quinn, have you ever tried to unbend a repad that would go in a thorispherical head. it would have more than one radius to unbend about. We are trying it here at my company, and the flat pattern just do not correspond to the expected.
Message 19 of 21
graemev
in reply to: enerfab

You mean like this?

Repad.JPG

Message 20 of 21
renatodomingues09
in reply to: graemev

I cant see more than one radius in this example. The only one radius is the shell OD radios, right? I mean, try to create this part, but not bend it over a pipe, but over a sphere. I'm talking about a much more complex geometry, but the sphere is the basis for it.

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