Science and techno world topic: Technology
Jewelry, toys, prototypes, models are just some of the
applications of an industry growing exponentially. Within 10 years aims to
revolutionize the manufacture.
Photo: 3d printed parts |
When the mid-'80s began to circulate the
first machines for 3D printing, few were willing to bet that the
technology had a chance to drive a revolution in manufacturing. At
the time the only available technique was the stereolithography, which
consisted precisely in the print layers of photopolymer modeled through the use
of ultraviolet light and gradually superimposed to form more or less faithful
reproduction of a three-dimensional object. It was a slow and
expensive process (a machine could cost as much as 500 thousand dollars)
and therefore unattractive for large-scale application.
Almost thirty years later the situation has drastically changed. The cost
of equipment over the years has literally collapsed to the point
that more than 10 years, many companies take advantage of 3D printing to build three-dimensional plastic prototypes without
having to activate a process of production ad hoc. But it is only in
recent years that the three-dimensional printing machines have reached such
a low cost to enable a potential distribution at the household level. Suffice
to say that there are companies like MakerBot who have already sold
3D printers small a price not exceeding one thousand euros (some even
go below 500).
Of course, the basic concept of 3D printing is
attractive: build a three dimensional model of your computer screen and orders
the printer to use it to forge a true representation of plastic. But how
will such a technology to revolutionize the manufacturing sector? Before
answering this question, we need to go a little into detail.
Techniques: the concept of additive
manufacturing
Most of the machines for 3D printing uses a production
technique known as additive manufacturing: desired object is modeled by
printing a layer at a time and superimposing those already printed. To do
this you can proceed in several ways. 3D printers to laser
sintering create the object by laser heating of the
metal powders or thermoplastic and compacting at a specific location
layer by layer. In the Fused Deposition Modeling is used a
heated nozzle that melts the material of manufacture and places it
three-dimensionally so as to reproduce the 3D model on the
screen. There are other techniques used mainly in industry, such as Laminated
Object Manufacturing, which consists when stacking thin layers of
material which from time to time are engraved by laser.
There are also techniques that reflect the concept of
stereolithography as the Digital Light Processing (photopolymer cured by
means of light).
Advantages: cheap, a few waste and increasing
flexibility
The benefits of 3D printing are endless, a little 'as
possible fields of application. It should be stated at the outset that
this technology is becoming more and more cheaply, machinery
and ink (in fact most of the times is a plastic material) become more
affordable, in addition the fabrication technique allows deposition
of wasting very little raw material (where Instead the major
processes producing tons and tons of waste). The type of
materials used is expanding (albeit slowly) and multinationals operating
in the automotive or aircraft has already begun to produce the first
titanium parts. These same industries can thus produce individual
components without having to launch a full and expensive production
process, or just reprint some components running without having to reconsider
the project as a whole. Recently, techniques have been developed to
produce objects made of several pieces already
assembled. Furthermore, the laser sintering allows to forge objects
with lighter materials than those usually used, and to obtain forms
and structures previously inconceivable.
Disadvantages: long processing times and quality
control difficult
It is one thing when a person wants to produce a handful
of plastic pots to test their creative ambitions; another is when this
technology is employed in the industry with the goal of producing
complete pieces in bulk. The aspiring potter can spend time perfecting his
model on the computer and then let the printer do the rest, but the industry
needs the final result meets the high standards of quality (and
safety) and, especially, has require that the results come quickly.
The time here is the main problem of the 3D
printing means the production of a single object costs a huge amount of time,
and the object is more complicated (and larger) than this time
expands. The second obstacle to the diffusion of these techniques is the
difficulty in performing an effective quality control on the production of
objects: science each piece product may be made up of thousands of layers of
material, it is difficult to control which layers bring back imperfections and
how this could impair the functionality of the object.
From this point of view the 3D printing technology should
make many more steps forward, so as to ensure the production of objects and
components identical in every detail.
Prospects: the engine of the Boeing medical
implants
Some people want to buy it to make himself a
plastic jewels, there are nerds who have already begun to shape
virtual models for their action figures, but who has more interest in
the future development of additive manufacturing
technologies, manufacturing industries are. Despite the
disadvantages and problems that we mentioned above, the 3D printing techniques
(including laser sintering) are already used in various fields. General
Electric, for example, has already begun to produce fuel
injectors for engines of the Boeing 787 Dreamliner
jet "printing" 20,000 different components then assembled into the
engine. For the year ahead, the company already has plans to exploit the
laser sintering to produce titanium strips to be mounted on
the propeller blades that will serve to more easily remove the debris
collected in flight. The European company EADS instead is using
this technology to produce satellite components. But they are
different areas that have decided to rely (or at least try) to 3D printing,
such as the 'biomedical engineering, which is evaluating the
possibility of using ceramic materials for the production of prostheses and
implants.
As we explained, because the 3D printing can really have
a role in the manufacturing industry of the future, you must first overcome the
limitations represented by the timing of production, materials used and quality
control systems. But in the meantime the weather and are wasted on the
subject has been debated to the point of generating two camps: there are some
who focuses on copyright issues that a massive expansion of 3D
printers could generate, and the other Who sees the additive in the manufacture
a satisfactory substitute for teleportation . What is certain is
that the techniques of 3D printing for now continue to depopulate as devices
for prototyping low cost, an area in which you are reaching
previously unattainable levels.
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