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Selective laser sinteringis an additive manufacturing approach that uses a excessive power laser (for example, a carbon dioxide laser) to fuse small particles of plastic, metal (Direct Steel Laser Sintering), ceramic, or glass powders right into a mass representing a desired 3-dimensional object. The laser selectively fuses powdered material by scanning cross-sections generated from a three-D digital description of the part (for example from a CAD file or scan information) on the surface of a powder bed. After every cross-section is scanned, the powder bed is lowered by one layer thickness, a brand new layer of fabric is utilized on high, and the process is repeated until the half is accomplished – selective laser sintering machine.
In comparison with different strategies of additive manufacturing, SLS can produce elements from a comparatively wide selection of commercially accessible powder materials. These embody polymers such as nylon, (neat, glass-stuffed or with different fillers) or polystyrene, metals including steel, titanium, alloy mixtures, and composites and inexperienced sand. The bodily course of can be full melting, partial melting, or liquid-section sintering. And, depending on the material, up to a hundred% density might be achieved with materials properties comparable to those from typical manufacturing methods. In many instances giant numbers of parts could be packed within the powder mattress, permitting very excessive productivity.
SLS is carried out by machines called Selective laser sintering systems. Selective laser sintering know-how is in extensive use around the globe on account of its means to easily make very advanced geometries instantly from digital CAD data. While it began as a technique to construct prototype components early within the design cycle, it is more and more being utilized in limited-run fabrication to produce end-use parts. One less anticipated and quickly growing utility of Selective laser sintering is its use in art.
Selective laser sintering was developed and patented by Dr. Carl Deckard at the College of Texas at Austin within the mid-1980s, beneath sponsorship of DARPA. An identical process was patented with out being commercialized by R.F. Housholder in 1979.
Not like some other rapid fabrication processes, comparable to Stereolithography prototyping (SLA) and Fused Deposition Modeling (FDM), Selective laser sintering doesn’t require support structures as a result of the truth that the half being constructed is surrounded by unsintered powder in any respect times.
Producers have traditionally used machine instruments to produce prototype parts by eradicating materials from strong blocks of steel (or plastic), or from castings, forgings or extrusions. When machining a strong, it is not uncommon to remove over 90% of the original materials, which is both inefficient and expensive when it comes to the fabric used and the swarf that has to be removed and recycled.
Direct metal laser sintering (DMLS) fabricates metallic prototypes and tools directly from laptop aided design (CAD) data. The process is in style in speedy tooling (RT) ,since an appropriate steel powder can be used to provide the metal parts and tools. The powder system may be pre-alloyed powder or multi-part powder. The properties of the RT elements, however, depend upon its composition and solidification conditions. Accuracy, put on resistance and mechanical properties are important on selecting the rapid tooling mould as the manufacturing-grade tooling. This examine consists of the design of steel prototypes that are then fabricated by EOS’s DMLS. The EOS material system is a mixture of nickel, bronze and copper-phosphide material. The dimensional accuracy, floor roughness, affect toughness, hardness, and energy of EOS parts are measured. SEM footage of EOS components are also totally analysed.
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Tags: prototyping, Science, SLS, software, tech
Posted in Uncategorized · April 6th, 2010 · Comments (0)
Those (thinking about|considering purchasing a hybrid car may be more than a little concerned about what lies under the hood. Hybrid cars have partially battery-powered motors. Since a battery powered motors is not what that typically comes to mind when people think about what is driving a car, it’s a good idea to get an understanding of hybrid car battery packs. You will find a few facts about them below.
Hybrid car battery packs do not need to be replaced like torch batteries do. Made to last over the lifetime of the vehicle, a hybrid car’s warranty covers the battery for a time period that lasts between eight and ten years. In terms of mileage, a hybrid car battery pack is expected to last between 150,000 and 200,000 miles, and it probably will last longer than that.
The toxicity of hybrid car battery packs is a concern, but not a major concern, since hybrid car batteries use NiMH batteries, not the rechargeable nickel cadmium ones. Nickel cadmium batteries can be detrimental to the environment if not disposed of correctly, but the NiMH batteries that are used in hybrid car battery packs are fully recyclable.
Hybrid car battery packs contain hundreds of cells. Hundreds of cells means that hybrid cars have a complex battery underneath their hoods, and complexity does usually mean expensive, but with the generous warranty car manufacturers are giving on these cars, there is little risk of additional massive expense from the battery pack involved in purchasing a hybrid car.
The number of hybrid car battery pack failures has been really low. When I say low, I mean really low. If failure occurs, it’s probably before the hybrid car even gets off the forecourt. Toyota has even said that some of its original Prius models have packs that have gone over 300,000 miles.
The cost of replacing hybrid car battery packs isn’t really even an issue. It isn’t a problem because the hybrid car battery packs are built for longevity. The Department of Energy looked into hybrid cars, but halted its tests when the capacity of the hybrid car battery pack was determined to be “just like new” after 160,000 miles. So, very few people really seem to know for sure what it costs to replace hybrid car battery packs except the manufacturers.
Hybrid car battery packs are evolving very quickly. If we look into the near future, we can see the next generation of hybrid car batteries is already in the works. The goal is, naturally, to discover a technology that gives lots of power, lasts for the hybrid car’s lifetime, and costs less to make than it does today.
If your hybrid car battery pack does develop a problem, there is a solution. Toyota has given some advice on what to do, should your hybrid battery pack run out after the warranty has expired. Their advice is to have the battery reconditioned. This solution works well because if something does go wrong, the problem usually lies with only one of the 28 modules that make up the battery.
So, if you simply replace the problematic module with one that matches the chemistry of the other 27 modules, your hybrid car’s battery should be back in good shape. You can find a match by getting a battery pack from another car that has a similar mileage and age.
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Tags: automobiles, Cars and Trucks, environmental, Fashion, hi-tech, hybrid vehicles, innovation, Leasing, oil, other, Outdoors, Science, SUV, Technology, trucks
Posted in Cars and Trucks · November 21st, 2009 · Comments (0)