Lost Foam Casting Essay Example | Topics and Well Written Essays - 1250 words

Lost Foam Casting - Essay Example The pattern is made through the use of polystyrene foam. If the cast is to be made on the basis of a simple geometrical form, then the use of a hot wire foam cutter can be done. In case the volume of casting is large, then a mass production usage pattern is sued which is similar to the injection molding technique. The foam cluster done for the casting is coated with ceramic material via the use of brushing, dipping, flow casting and spraying. This form of coating is known as the refractory coating technique. After this coating dries, then the cast is put into a container and baked up on a vibration table with unbounded sand. The system of automatic pouring is significant in the Lost Foam Casting (LFC) because the pouring process is most critical in this form of casting technique (Youtube.com, 2013). The common metals that are used for casting in the Lost Foam Casting (LFC) are cast irons, nickel alloys, aluminum alloys, copper alloys, stainless steels and steels. The size of the cast ing ranges from 0.5 kg to hundreds of tons. The minimum thickness of the walls of the casts is 2.5 mm. There is no upper limit for the thickness of these types of castings. The linear tolerance of these casting is 0.005 mm/mm and the general surface finish ranges from 25 to 23 mm in RMS. There are different types of LFC employed in the arena of engineering and construction (Figure 3). There are many industrial applications of the Lost Foam Casting (LFC) technique. This casting process is commonly used in small scale and large scale engineering and manufacturing of products.

Services of DEX Media Assignment Example | Topics and Well Written Essays - 250 words

Services of DEX Media - Assignment Example Additionally, Dex Media prints directories for use in automobiles. These directories feature maps, shopping guides, entertainment lists, and telephone as well as address information for central business district. Similarly, Dex Media prints bilingual directories in English and Spanish for about 20 markets. On the other hand, Dex Media offers digital services including marketing on search engine and optimization, keyword implementation, social media marketing, tracking, and reporting. Since most customers did not use print directories frequently, Dex Media faced stiff competition from online businesses and hence launched its online directory assistance program with an enhanced and superior internet search system. The company used recent technology to reinforce search ability of its content in more than 240000 advertisement displays in the company’s directories in the yellow pages. The Dex Media’s search system offers multiple search choices in a single search box thereby allowing customers to search using product or brand names, hours of operation, and location. Dex Media’s online presence is on the Dex Knows.com and Superpages.com. In addition, it offers consumer digital services like search portals, applications, and directories. The company displays content in a number of platforms in partnerships with digital companies like Google, Bing, Yahoo, and many others. Again, Dex Media offers face book creation with automatic updates and guidance on social media