Usually, we're telling you about bigger 3D printer build volumes, not smaller ones. But this is a bit different. Optomec has taken a highly sophisticated 3D printing process for metals and made it available in a smaller machine.
Engineers have been producing metal components, not just prototypes, for several years using Optomec's version of selective laser sintering (SLS), which the company calls LENS (Laser Engineered Net Shaping). The components built have been relatively large, with a process work envelope of 900 mm x 1,500 mm x 900 mm (35.43 inch x 59.0 inch x 35.43 inch) for the company's largest machine, the 850-R. That one deposits material such as standard steels, titanium, and nickel alloys at up to 500 g/hr (1.1 lb/hr).
Click on the image below to start the slideshow.
Optomec's original, large 850-R system is used for making final production parts or prototypes, and repairing metallic components, such as this casing. (Source: Optomec)
Optomec says that for many applications the mechanical properties of components built with the process are equivalent to those of wrought metals. For example, independent testing has shown that the fatigue strength of Ti 6-4 matches the fatigue strength of wrought annealed material. Yield strength and tensile strength of the 3D-printed material were actually better at 973 MPa and 1077 MPa versus 834 MPa and 973 MPa, respectively, for Ti-6Al-4V, a titanium/aluminum alloy. Among other things, Ti-6Al-4V alloys are used for structural components on commercial aircraft.
Originally developed at Sandia National Laboratories, the LENS process has been used for prototyping and manufacturing military and aerospace components, as well as medical instruments and implants. It can be used for adding layers of metals to an existing component to improve its wear resistance, or add features to large cast components, such as a flange or boss. The process has also been optimized for repairing military and aerospace metallic components, such as restoring their inner diameters or inside blind holes. (Watch a video demonstrating the process below.)
The new machine, the LENS 450, is built with the same basic technology, but it has a much smaller process work envelope of 100 mm x 100 mm x 100 mm (3.94 inch x 3.94 inch x 3.94 inch). It also has a much slower (about 6.25 times slower) maximum deposition rate of 80 g/hr (2.82 oz/hr). It comes with a 400W fiber laser, a motion control system, and proprietary process control and part preparation software. The machine prints titanium, stainless steel, cobalt chrome, and superalloys.
So why would anyone want one of these? Interestingly, Optomec says it has developed this model to help proliferate the use of metals in additive manufacturing. The company is aiming the printer at university mechanical and materials engineering departments and labs, for the purpose of training the next generation of engineers in AM, and specifically, AM with metals.
The first machine will be delivered to the University of Pittsburgh's department of mechanical engineering and materials science, for use in the department's advanced manufacturing program. The university is a member of the federally sponsored National Additive Manufacturing Innovation Institute (NAMII). Wouldn't it be interesting if this became a trend?
I'm reluctant to plug a commercial service, but have any of you looked at www.shapeways.com? It's an online 3D printing service where you can upload STL files and they mail you your part - in an amazing variety of available materials. I recently had a camera part made in stainless steel for a fraction of just the material cost to make it by machining from bar stock. There may be other similar things out there, but this is the one I've happened to come across.
eafpres, I had a similar experience after writing my first metals 3D printing article several months ago: it seemed like suddenly I saw media coverage of similar manufacturers everywhere. Of course, there are always way more service bureaus than manufacturers of the technology. Good to know the service bureaus are available.
78RPM, those snake and worm robots are fun, aren't they? The idea of their self-reconfiguration ability makes them even more interesting. And yes, things are moving awfully fast in these design areas. It often feels like the future is already here.
Nadine, to clarify again, I don't find my article more compelling, I find the concepts discussed in it of self-assembling and self-reconfiguring robots and methods more compelling than the lego-like so-called "digital materials" in the MIT paper. Anyway, too bad what you heard about isn't findable anywhere online. If you ever do find links, please let us know. It sounds a bit like MIT's so-called 4D printing, which is actually self-assembly combined with 3D printing. I wrote about that here: http://www.designnews.com/author.asp?section_id=1392&doc_id=260118
I want one of those Transformers. I've seen other Design News articles about robotic snakes and the like. It will be really useful when snake robots can crawl through small spaces, then reconfigure to lift a fallen piece of concrete rubble or take out a firehose or whatever the need is. The future is really being invented very fast, isn't it?
78RPM, the self-assembly and self-reconfiguring concepts in my other article are definitely more futuristic. OTOH, this Transformer-like robot is pretty here and now, if still small: http://www.designnews.com/document.asp?doc_id=256018
Oak Ridge National Laboratory has developed a surface preparation method to improve joining carbon composites with aluminum, with potentially far-reaching ramifications for high-volume industrial applications.
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