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  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
1

Desenvolvimento de um sistema de ventila??o for?ada para secar o fio m?quina na lamina??o a frio de vergalh?es

Rocha, F?bio Augusto Costa da 29 May 2012 (has links)
Made available in DSpace on 2015-04-14T13:58:51Z (GMT). No. of bitstreams: 1 439945.pdf: 2035621 bytes, checksum: 74dbb8f5ad2bb0c294b36e4fbd0fa10c (MD5) Previous issue date: 2012-05-29 / The national steel industry has been modernized. Indeed, its processes seek stability in the production area. The cold rolling of rebars is a process which is evolving: technological advance allows such machines, for example, reach speeds up to 17 m/s. However, high speeds bring the probability of interruptions in production. At Gerdau, the cold rolling mills are common, and one of the main reasons identified by stopping production units throughout Brazil is just a interruption in machinery because of wire rod wet by the rain water. This fact is because the lubricant and has very small particles with the passage of the wire rod wet, expands, and deposited on the cassettes - the equipment responsible for a reduction of the wire rod - locking the bearings of the rolls. The solution adopted for the removal of water from the wire rod was the installation of a system compound of a tube with bearings at the ends two nozzles spaced 120? from e ach other. In theses nozzles are hoses coupled, in turn, are connected to a centrifugal fan. The implementation of this system guaranteed, thus, the stability of the process, even on rainy days. / A siderurgia nacional vem se modernizando. Logo, seus processos buscam a estabilidade na ?rea de produ??o. A lamina??o a frio de vergalh?es ? um processo que vem evoluindo: o avan?o tecnol?gico permite a tais m?quinas, por exemplo, alcan?ar velocidades de at? 17 m/s. Entretanto, altas velocidades trazem consigo a probabilidade de interrup??es na produ??o. Na Gerdau, os laminadores a frio s?o comuns, e um dos principais motivos de parada identificado pelas unidades de produ??o espalhadas pelo Brasil ? justamente a interrup??o das m?quinas em virtude de fio m?quina molhado pela ?gua da chuva. Tal fato se d? porque o lubrificante possui part?culas muito pequenas e, com a passagem do fio m?quina molhado, se expande, e com o arraste, se aglomera sobre os cassetes equipamentos respons?veis pela redu??o da ?rea do fio m?quina trancando os rolamentos dos rolos laminadores. A solu??o adotada para a retirada da ?gua do fio m?quina foi a instala??o de um sistema composto por um tubo com mancais nas pontas mais dois bicos distanciados 120? um do outro. Nesses bicos est?o acopladas mangueiras que, por sua vez, est?o conectadas a um ventilador centr?fugo. A implanta??o desse sistema garantiu, dessa forma, a estabilidade do processo, mesmo em dias chuvosos.

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