Featured Research

from universities, journals, and other organizations

New USC Process Offers Faster, Cheaper 3D 'Printouts'; Desktop Manufacturing For Home Desks Seen

Date:
November 25, 2003
Source:
University Of Southern California
Summary:
A University of Southern California inventor has created a machine that can produce 3-dimensional "printouts" in plastic and even metal more quickly and cheaply than widely-used existing systems.

A University of Southern California inventor has created a machine that can produce 3-dimensional "printouts" in plastic and even metal more quickly and cheaply than widely-used existing systems.

The new machine is a significant improvement on the laser sintering machines now widely used around the world to build complex 3D forms from computer files, according to its creator, Professor Behrokh Khoshnevis of the USC School of Engineering's Daniel J. Epstein department of Industrial and Systems Engineering.

One patent has been granted and others are pending on the process, which may eventually put 3D object-making within reach of home offices.

Both traditional laser sintering and Dr. Khoshnevis' "Selective Inhibition of Sintering" (SIS) process start with CAD ("computer aided design) three-dimensional form creation software.

The three-dimensional shapes visualized in the computer are re-visualized as stacks of very thin virtual layers. Then, each virtual layer is transformed into a real one.

Sintering machines build up objects by spreading a less- than-1 millimeter thick layer of powdered plastic or other material in a work area, and then melting ("sintering") selected areas, guided by the computer pattern. The process is repeated multiple times, with unmelted powder shaken off or blown away at the end of the process.

The result is to gradually build up complex forms, layer by layer. Such structures as free rolling balls inside of cages, for example, can easily be made.

The objects created were once almost exclusively used as molds or prototypes for die-casting, stamping or other traditional mass-production processes, and this role gave the name "rapid prototyping" to such processes. But with the increasing sophistication of techniques, some companies now use R-P processes - and particularly laser sintering -- for what is now called "direct manufacturing" or "desktop manufacturing" of final products.

Existing machines use a moving laser beam traveling over the work area to do the melting. SIS, for "Selective Inhibition Sintering" instead automatically treats some of the powder applied to resist bonding with adjacent particles under heat, and then exposes the entire piece to uniform, high-intensity heat. Untreated areas of powder sinter. Treated areas do not.

Various anti-sintering materials can be used, including salt water.

Khoshnevis says the SIS process has several advantages over laser machines. The lasers and scanners used in such machines are extremely expensive (up to $100,000 each), short-lived, and energy intensive, he notes, while the heat source for an SIS can be a low- tech gas flame, or an inexpensive electrical heater filament. The cheap, high heat possible with the SIS process makes the use of metals as well as plastics feasible.

Finally, because lasers have to scan out the entire work area, turning on and off to melt the needed areas, they are intrinsically slower in building up pieces, with large, complicated pieces requiring many hours, or even days. The SIS machine can complete a layer in as little as 15 seconds.

The advantages of the process make it possible to see a wider range of use for such machines. "Down the line," says Dr. Khoshnevis, "home offices may have them, right alongside the printer." Shops may have similar, heavier duty units, he said, filling work niches now held by lathes and milling machines.

Khoshnevis now has a working prototype machine, the performance of which he has demonstrated at various conferences.

###

Khoshnevis' research was supported by a grant from the National Science Foundation.

Behrokh Khoshnevis Web site http://www-rcf.usc.edu/~khoshnev/


Story Source:

The above story is based on materials provided by University Of Southern California. Note: Materials may be edited for content and length.


Cite This Page:

University Of Southern California. "New USC Process Offers Faster, Cheaper 3D 'Printouts'; Desktop Manufacturing For Home Desks Seen." ScienceDaily. ScienceDaily, 25 November 2003. <www.sciencedaily.com/releases/2003/11/031125071102.htm>.
University Of Southern California. (2003, November 25). New USC Process Offers Faster, Cheaper 3D 'Printouts'; Desktop Manufacturing For Home Desks Seen. ScienceDaily. Retrieved October 21, 2014 from www.sciencedaily.com/releases/2003/11/031125071102.htm
University Of Southern California. "New USC Process Offers Faster, Cheaper 3D 'Printouts'; Desktop Manufacturing For Home Desks Seen." ScienceDaily. www.sciencedaily.com/releases/2003/11/031125071102.htm (accessed October 21, 2014).

Share This



More Matter & Energy News

Tuesday, October 21, 2014

Featured Research

from universities, journals, and other organizations


Featured Videos

from AP, Reuters, AFP, and other news services

Thanks, Marty McFly! Hoverboards Could Be Coming In 2015

Thanks, Marty McFly! Hoverboards Could Be Coming In 2015

Newsy (Oct. 21, 2014) If you've ever watched "Back to the Future Part II" and wanted to get your hands on a hoverboard, well, you might soon be in luck. Video provided by Newsy
Powered by NewsLook.com
Robots to Fly Planes Where Humans Can't

Robots to Fly Planes Where Humans Can't

Reuters - Innovations Video Online (Oct. 21, 2014) Researchers in South Korea are developing a robotic pilot that could potentially replace humans in the cockpit. Unlike drones and autopilot programs which are configured for specific aircraft, the robots' humanoid design will allow it to fly any type of plane with no additional sensors. Ben Gruber reports. Video provided by Reuters
Powered by NewsLook.com
Graphene Paint Offers Rust-Free Future

Graphene Paint Offers Rust-Free Future

Reuters - Innovations Video Online (Oct. 21, 2014) British scientists have developed a prototype graphene paint that can make coatings which are resistant to liquids, gases, and chemicals. The team says the paint could have a variety of uses, from stopping ships rusting to keeping food fresher for longer. Jim Drury reports. Video provided by Reuters
Powered by NewsLook.com
Massive Air Bag Recall Affects More Than 4.5 Million Vehicles

Massive Air Bag Recall Affects More Than 4.5 Million Vehicles

Reuters - US Online Video (Oct. 21, 2014) Major automakers are recalling millions of vehicles due to potentially defective front passenger air bag inflators that can rupture and spray metal shrapnel. Linda So reports. Video provided by Reuters
Powered by NewsLook.com

Search ScienceDaily

Number of stories in archives: 140,361

Find with keyword(s):
Enter a keyword or phrase to search ScienceDaily for related topics and research stories.

Save/Print:
Share:

Breaking News:

Strange & Offbeat Stories


Space & Time

Matter & Energy

Computers & Math

In Other News

... from NewsDaily.com

Science News

Health News

Environment News

Technology News



Save/Print:
Share:

Free Subscriptions


Get the latest science news with ScienceDaily's free email newsletters, updated daily and weekly. Or view hourly updated newsfeeds in your RSS reader:

Get Social & Mobile


Keep up to date with the latest news from ScienceDaily via social networks and mobile apps:

Have Feedback?


Tell us what you think of ScienceDaily -- we welcome both positive and negative comments. Have any problems using the site? Questions?
Mobile: iPhone Android Web
Follow: Facebook Twitter Google+
Subscribe: RSS Feeds Email Newsletters
Latest Headlines Health & Medicine Mind & Brain Space & Time Matter & Energy Computers & Math Plants & Animals Earth & Climate Fossils & Ruins