Forming a perforated sheet
Forming a perforated sheet
(OP)
Someone asked me an interesting question which I did not have an answer for. So naturally, I figured I would ask you guys (and gals).
We take a piece of perforated sheet metal (.149in holes on .1875in spacing), and draw it into a round shape. So the question is there an easy way to model this so that each of the perforations are (relativly) close to where one would expect them to be after the part is formed?
The attached image shows the cross section of the formed part.
We take a piece of perforated sheet metal (.149in holes on .1875in spacing), and draw it into a round shape. So the question is there an easy way to model this so that each of the perforations are (relativly) close to where one would expect them to be after the part is formed?
The attached image shows the cross section of the formed part.
Chris T.
Project Design Analyst
Kohler Co. Engine Division
Using NX7.5





RE: Forming a perforated sheet
John R. Baker, P.E.
Product 'Evangelist'
Product Engineering Software
Siemens PLM Software Inc.
Industry Sector
Cypress, CA
Siemens PLM:
UG/NX Museum:
To an Engineer, the glass is twice as big as it needs to be.
RE: Forming a perforated sheet
Chris T.
Project Design Analyst
Kohler Co. Engine Division
Using NX7.5
RE: Forming a perforated sheet
Sam Slivinski
Using NX 6
Manufacturing/Aerospace
RE: Forming a perforated sheet
Where my co-worker is struggling is how to model the perforations on the vertical drawn sections without much effort.
Chris T.
Project Design Analyst
Kohler Co. Engine Division
Using NX7.5
RE: Forming a perforated sheet
John R. Baker, P.E.
Product 'Evangelist'
Product Engineering Software
Siemens PLM Software Inc.
Industry Sector
Cypress, CA
Siemens PLM:
UG/NX Museum:
To an Engineer, the glass is twice as big as it needs to be.
RE: Forming a perforated sheet
John R. Baker, P.E.
Product 'Evangelist'
Product Engineering Software
Siemens PLM Software Inc.
Industry Sector
Cypress, CA
Siemens PLM:
UG/NX Museum:
To an Engineer, the glass is twice as big as it needs to be.
RE: Forming a perforated sheet
www.nxjournaling.com
RE: Forming a perforated sheet
Basic weight of the part can be manipulated in the file.
"Wildfires are dangerous, hard to control, and economically catastrophic."
Ben Loosli
RE: Forming a perforated sheet
John R. Baker, P.E.
Product 'Evangelist'
Product Engineering Software
Siemens PLM Software Inc.
Industry Sector
Cypress, CA
Siemens PLM:
UG/NX Museum:
To an Engineer, the glass is twice as big as it needs to be.
RE: Forming a perforated sheet
Proud Member of the Reality-Based Community..
To the Toolmaker, your nice little cartoon drawing of your glass looks cool, but your solid model sucks. Do you want me to fix it, or are you going to take all week to get it back to me so I can get some work done?
RE: Forming a perforated sheet
Sam Slivinski
Using NX 6
Manufacturing/Aerospace
RE: Forming a perforated sheet
Typically, we don't even bother to attempt to model the perforations. From a design standpoint, there really isn't any value in it.
The reason this question is being asked is because of a couple of reasons that others have pointed out. This part is a rotating screen that is at the inlet of the cooling system on a air cooled engine. The purpose of the screen is to block as much debris as possible, but still let as much air pass through as possible.
Our people that handle the analysis of the cooling system performance would prefer if the perforations were in the model. As it is now, they guess the locations. For their purposes, I'm not entirely sure how critical it is for them to have each perforation at it's exact location.
Also, our people that create the service literature from our models have been asking for more realistic models for some time.
Is it a show-stopper if we can't do this? Nah, not really. It would be nice, but I suspect that if it was possible, the model would become quite large and take up quite a bit of computer resources to handle.
Attached is a picture of a similar part.
Chris T.
Project Design Analyst
Kohler Co. Engine Division
Using NX7.5
RE: Forming a perforated sheet
“Know the rules well, so you can break them effectively.”
-Dalai Lama XIV
RE: Forming a perforated sheet
( possibly a sample of the perforated sheet and a sample of the shape to follow )
I did a quick and dirty test to see if the Global Shaping feature could do it , and it seems quite promising, See attached image. ( Note that i started with a square perforated sheet which was larger than the shape i wrapped to, i have not tried to wrap a solid in this case.)
The Global Shaping is probably in the "NX_Freeform_2" license which not everybody has.
I can later upload the model, if interest exists. ( This one NX 8.5)
Regards,
Tomas
RE: Forming a perforated sheet
I haven't had the need to mess around with Global Shaping much, so I will have to take a look at it. I'd like to take a look at your model, but I'm on NX7.5 at the moment...
Chris T.
Project Design Analyst
Kohler Co. Engine Division
Using NX7.5
RE: Forming a perforated sheet
I will play around with the model i have and see what i can come up with.
Regards,
Tomas
RE: Forming a perforated sheet
RE: Forming a perforated sheet
John R. Baker, P.E.
Product 'Evangelist'
Product Engineering Software
Siemens PLM Software Inc.
Industry Sector
Cypress, CA
Siemens PLM:
UG/NX Museum:
To an Engineer, the glass is twice as big as it needs to be.
RE: Forming a perforated sheet
Looks like I will try to tackle this next week!
Chris T.
Project Design Analyst
Kohler Co. Engine Division
Using NX7.5
RE: Forming a perforated sheet
It is a bit "volatile", if one sets the wrong input, it calculates "for ever".
The single sheet body in the image took a few minutes to calculate. ( Didn't clock it.)
Probably one can learn what to do and don't. In this case the shape that i formed to is a single b-surface sheet.
Don't know if this is better or worse.
Attached a 7.5 parasolid copy. ( model made in 8.5)
Regards,
Tomas
RE: Forming a perforated sheet
I've noticed that as well...if the wrong inputs are selected, it basically sits there forever. I'll keep playing around with it to see if I can get something that works
Chris T.
Project Design Analyst
Kohler Co. Engine Division
Using NX7.5
RE: Forming a perforated sheet
Regards,
Tomas
RE: Forming a perforated sheet
Chris T.
Project Design Analyst
Kohler Co. Engine Division
Using NX7.5
RE: Forming a perforated sheet
Regards Tomas
RE: Forming a perforated sheet
RE: Forming a perforated sheet
Best regards
Simon NX 7.5.4.4 MP8 and NX 8.5 (native) - TC 8 www.jcb.com