Great question Ken! Since the SolidWorks model is idealized (meaning there is no actual bend deformation) but in the real world there is stretching and compression in the bent corners, the flat pattern is slightly different in total mass/volume as compared to the formed shape. This deformation is calculated using a bend calculation like K-FACTOR or BEND DEDCUTION. (see my other video on K-FACTOR for more details here). So you'd have to know which calculation is being used, if you wanted to start with a flat part and end up with a formed part. (using sheet metal sketched bends, for example) In the case of this part: MASS when formed: 1380.15 g K-FACTOR: 0.3333 MASS in the flat: 1359.08 g Pretty wide deviation right? crazy
I have a doubt on 7:52 that you subtract wall thickness and bend radius. My doubt is bend radius what will the normal distance be. Next time can you show that in measure explaining that.
There's 2 ways you could do this: Either use a "layout feature" like a sketch or set of planes at the correct locations, or use LINKED VALUES/GLOBAL VARIABLES. Both of these would yield an elegant solution. I guess the other thing you could do would be to extrude to 180, then make your edge flanges MATERIAL INSIDE (for the flange position) - but then you'd have to use TRIM SIDE BENDS and then clean up the lower area, so it would take an extrude CUT EXTRUDE. But this would work too, and would be dynamic and elegant.
Do one on ‘convert to sheet metal’.
💯 respect!
As usual great video
Thanks James!
Curious question: If someone only modeled the flat pattern, would the mass be correct? Maybe that's another "ivan exploit"?
Unless other processes are done to remove material there would be no mass change from flat to shaped part.
Great question Ken! Since the SolidWorks model is idealized (meaning there is no actual bend deformation) but in the real world there is stretching and compression in the bent corners, the flat pattern is slightly different in total mass/volume as compared to the formed shape. This deformation is calculated using a bend calculation like K-FACTOR or BEND DEDCUTION. (see my other video on K-FACTOR for more details here). So you'd have to know which calculation is being used, if you wanted to start with a flat part and end up with a formed part. (using sheet metal sketched bends, for example)
In the case of this part:
MASS when formed: 1380.15 g
K-FACTOR: 0.3333
MASS in the flat: 1359.08 g
Pretty wide deviation right? crazy
@Nanan00 see my comment to ken - interesting stuff!
I have a doubt on 7:52 that you subtract wall thickness and bend radius. My doubt is bend radius what will the normal distance be. Next time can you show that in measure explaining that.
There's 2 ways you could do this: Either use a "layout feature" like a sketch or set of planes at the correct locations, or use LINKED VALUES/GLOBAL VARIABLES. Both of these would yield an elegant solution.
I guess the other thing you could do would be to extrude to 180, then make your edge flanges MATERIAL INSIDE (for the flange position) - but then you'd have to use TRIM SIDE BENDS and then clean up the lower area, so it would take an extrude CUT EXTRUDE. But this would work too, and would be dynamic and elegant.