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Rapid prototyping

Rapid prototyping

Coolidge www.diecastingpartsupplier.com 2018-07-09 16:22:58

Rapid prototyping


Not to be confused with Digital prototyping.
This article is about rapid prototyping of physical objects. For rapid software prototyping, see rapid application development.

A rapid prototyping machine using selective laser sintering (SLS)

3D model slicing
Rapid prototyping is a group of techniques used to quickly fabricate a scale model of a physical part or assembly using three-dimensional computer aided design (CAD) data.[1][2] Construction of the part or assembly is usually done using 3D printing or "additive layer manufacturing" technology.[3]
The first methods for rapid prototyping became available in the late 1980s and were used to produce models and prototype parts. Today, they are used for a wide range of applications[4] and are used to manufactureproduction-quality parts in relatively small numbers if desired without the typical unfavorable short-run economics. This economy has encouraged online service bureaus. Historical surveys of RP technology[2] start with discussions of simulacra production techniques used by 19th-century sculptors. Some modern sculptors use the progeny technology to produce exhibitions.[5] The ability to reproduce designs from a dataset has given rise to issues of rights, as it is now possible to interpolate volumetric data from one-dimensional images.
As with CNC subtractive methods, the computer-aided-design – computer-aided manufacturing CAD -CAM workflow in the traditional Rapid Prototyping process starts with the creation of geometric data, either as a 3D solid using a CAD workstation, or 2D slices using a scanning device. For Rapid prototyping this data must represent a valid geometric model; namely, one whose boundary surfaces enclose a finite volume, contain no holes exposing the interior, and do not fold back on themselves. In other words, the object must have an "inside". The model is valid if for each point in 3D space the computer can determine uniquely whether that point lies inside, on, or outside the boundary surface of the model. CAD post-processors will approximate the application vendors' internal CAD geometric forms (e.g., B-splines) with a simplified mathematical form, which in turn is expressed in a specified data format which is a common feature in additive manufacturing: STL (stereolithography) a de facto standard for transferring solid geometric models to SFF machines. To obtain the necessary motion control trajectories to drive the actual SFF, rapid prototyping, 3D printing or additive manufacturing mechanism, the prepared geometric model is typically sliced into layers, and the slices are scanned into lines (producing a "2D drawing" used to generate trajectory as in CNC's toolpath), mimicking in reverse the layer-to-layer physical building process.
Contributor(s): Brenda Cole
Rapid prototyping is the speedy creation of a full-scale model. The word prototype comes from the Latin words proto (original) and typus (model).

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In manufacturing, rapid prototyping is used to create a three-dimensional model of a part or product. In addition to providing 3-D visualization for digitally rendered items, rapid prototyping can be used to test the efficiency of a part or product design before it is manufactured in larger quantities. Testing may have more to do with the shape or size of a design, rather than its strength or durability, because the prototype may not be made of the same material as the final product. Today, prototypes are often created with additive layer manufacturing technology, also known as 3-D printing. Direct metal laser sintering (DMLS) may also be used to create aluminum, stainless steel or titanium prototypes. This process uses laser beams to melt and fuse metal powders into solid parts.

In network design, rapid prototyping can be used to map the architecture for a new network.  A rapid prototype tool called Mininet, for example, allows the user to quickly create, interact with, customize and share a software-defined network (SDN) prototype on a single computer which simulates a network topology that uses Openflow switches.

In software development, when a small team quickly builds a working software program for users to review, it is also called rapid prototyping. It may also be called rapid application development

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