|
g*******a
发帖数: 1383 | 2 hello, can someone explain me that during a die making
process, how the CAM get involved? say i have a sample,
and want to make stamping die acordingly. the hold way
would be hand, but i'm curious if they use some kind
of "scanning" process like electrode then get the shape
into CAM/CAD software.
i'm no ME so if someone knows how this works please
let me know, thanks! |
|
s*i
发帖数: 5025 | 3 The process is actually straight forward. The software creates "path" for the
electrode. Then there is motor drived stages to perform the action to get the
job done physically. |
|
g*******a
发帖数: 1383 | 4 thanks dude, do you know some good websites or books can give
me an intro on this kind of rapid prototyping and die making
process??
if the software has to create a path according to a sample,
how does the surface information get input into the system?
by some kind of scanning device or hand ?
thank you! |
|
s*i
发帖数: 5025 | 5 Man, I didn't expect you know the word "rapid prototyping".
The very basic idea is:
CAD --slicing-->layered representation -->path -->machine code
The virtual CAD model, can be either designed from scratch, or reverse
engineerred, which involvs a scanning system to get point cloud.
The de facto format of CAD for rapid prototyping is STL. So if you search
google, the keyword should be:
STL, Rapid prototyping, point cloud, segmentation(CT, MRI-->surface model)...
Reverse Engineering
I know them be |
|
g*******a
发帖数: 1383 | 6 awesome! hey, thanks a lot dude, i really appreciate it.
i'm an EE by trade, so i know some of the terms.
my situation is "rapid prototyping via reverse engineering"
i restore old (antique) motorcycles as a hobby, so a lot of parts have
to be made from original samples. it just takes too long to make a
stamping die, 1~2 month, by hand. so i'm looking for some ways
can expdite the die making. can you tell me more on the part
of "surface scanning" to "CAD drawing"? like what device you
use to scan |
|
s*i
发帖数: 5025 | 7 Check out this guy - Wohlers
http://www.wohlersassociates.com
Under Resource Listings, you will find all the stuff you needed.
You are rich, BTW.
model)... |
|
g*******a
发帖数: 1383 | 8 i'm learning, i'm learning...
looks like all these companies are marketing their prototyping
technology to china, for the manufacturing system, smart..
what's the most reputable industry show for this prototyping
technologies?
i'm not rich, yet, but i'm always curious about everything, hehe |
|
s*i
发帖数: 5025 | 9 Euromold
SME Exposition (April or May urually)
Solid Freeform Fabrication conference at Austin (August every year, more
academic)
Hope this helps :) |
|
g*******a
发帖数: 1383 | 10 i read almost all the scanning technologies, but all of them
are "scanning". is there anything can take a picture of a surface
and analyze it into a "point cloud" or some kind of vector based
format? i mean a still picture |
|
s*i
发帖数: 5025 | 11 Sorry. I thought you have 3D piece already.
A 2D picture, which essentially is a projection of 3D obejcts, irreversibly
lost information. But it is still doable, with some assumptions and
limitations.
Search "3D Reconstruction from a single view". I doubt it is practical. I
remember a guy named "Wang Jianguo" in Tsinghua University did it many years
ago. He basically reversed a car's image to a 3D car model, and then used LOM
process to get a real model. But it is a toy anyway. |
|
g*******a
发帖数: 1383 | 12 i'll search around
i was wondering if a scanner can do this, why not w/ some kind of
special camera, taking a pic of some surface and bam! you got the
point-cloud on the computer |
|
s*i
发帖数: 5025 | 13 Yes. People are doing that. THey call that "depth from focus" and "depth from
defocus". Augmented reality guys are also doing similar thing: that is retrive
depth information from two cameras. Again, it is not accurate enough :(
irreversibly
years
LOM |
|
|
