Rapid Prototyping: Laser-based and Other Technologies by Patri K. Venuvinod

By Patri K. Venuvinod

Since the sunrise of civilization, mankind has been engaged within the belief and manufacture of discrete items to serve the practical wishes of neighborhood consumers and the instruments (technology) wanted via different craftsmen. in truth, a lot of the development in civilization could be attributed to development in discrete product manufacture. The performance of a discrete item depends upon entities: shape, and fabric composition. for example, the cultured visual appeal of a sculpture will depend on its shape while its sturdiness is determined by the cloth composition. an incredible production strategy is one who is ready to instantly generate any shape (freeform) in any fabric. despite the fact that, regrettably, most standard production approaches are significantly limited on a lot of these counts. There are 3 easy methods of making shape: conservative, subtractive, and additive. within the first strategy, we take a fabric and follow the wanted forces to deform it to the necessary form, with no both including or removal fabric, i. e. , we preserve fabric. Many business tactics comparable to forging, casting, sheet steel forming and extrusion emulate this process. an issue with a lot of those techniques is they specialize in shape new release with out explicitly offering any potential for controlling fabric composition. in reality, even shape isn't really created at once. They only reproduction the exterior shape embedded in exterior tooling akin to dies and molds and the interior shape embedded in cores, and so on. until lately, now we have needed to inn to the 'subtractive' method of create the shape of the tooling.

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Extra resources for Rapid Prototyping: Laser-based and Other Technologies

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The material is electrically conductive because the delocalized ions move about easily when an electric potential is applied. Three types of secondary bonds are of particular importance. The weakest (2 to 8kJ/mol) of these are bonds formed due to Van der Waals forces as in polyethylene. , pairs of equal and opposite electric charges with noncoincident centers. These dipoles tend to align with each other and induce further polarization in neighboring molecules so that a net attractive force is always present.

The number of secondary bonds and hence the strength of a polymer increases with increasing chain length. , there can be relative motion between molecules. , the heated polymer is cooled), the polymer practically returns to its original hardness and strength. Polymers exhibiting such reversible behavior are called thermoplastics. Thermoplastics are extensively used in industry and are shaped using processes such as injection molding. Such plastics are also used in rapid prototyping processes such as laser stereolithography.

The next level of secondary bond is the dipole bond that arises because the sharing of electrons in a covalent bond results in the atoms losing electrons appearing to be positively charged and vice versa. Thus, a permanent dipole is set up. Such polar molecules containing Cl, F, or 0 valences make stronger bonds (6 to 13kJ/mol) as in PVC (polyvynil chloride). The final level of secondary bond in terms of strength (13 to 30kJ/mol) is the hydrogen bond that is a special case of dipole bond occurring between hydrogen and F, 0, or N atoms.

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