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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 e avalia??o de padr?o de torque para calibra??o de torqu?metros em tr?s faixas de medi??o

Dantas, Alexandro Barreto 03 September 2007 (has links)
Made available in DSpace on 2014-12-17T14:58:25Z (GMT). No. of bitstreams: 1 AlexandroBD.pdf: 1325116 bytes, checksum: a0d962d3893dafa626cf6e5b2c8d670f (MD5) Previous issue date: 2007-09-03 / The continuous development of instruments and equipment used as tools or torque measurement in the industry is demanding more accurate techniques in the use of this kind instrumentation, including development of metrological characteristics in torque measurement. The same happens with the needs in calibration services. There is a diversity of methods of hand torque tools in the market with different measuring range but without complaining with technical standards in terms of requirements of quality and reliability. However, actually there is no choice of a torque measuring standard that fulfils, with low cost, the needs for the calibration of hand torque tools in a large number of ranges. The objective of this thesis is to show the development and evaluation of a torque measuring standard device with a conception to allow the calibration of hand torque tools with three levels of torque with an single instrument, promoting reduction of costs and time in the calibration, also offering reliability for the evaluation of torque measuring instrument. To attend the demand in the calibration of hand torque tools it is necessary that the calibration laboratories have a big collection of torque measuring standards, to fulfills the needs of the costumer, what is very costly. The development of this type of torque measuring standard revealed a viable technique and economically making possible the calibration of hand torque tools in different nominal ranges through a single measurement system versatile, efficient and of easy operation / O constante desenvolvimento dos instrumentos e equipamentos utilizados para aplica??o e medi??o de torque na ind?stria em geral, incluindo suas t?cnicas de uso e instrumenta??o cada vez mais exatas e abrangentes, qualifica a metrologia em torque como uma das ?reas da engenharia mec?nica em maior desenvolvimento tecnol?gico e com crescente demanda em servi?os de calibra??o. Existe uma diversidade de calibradores de torqu?metros dispon?vel no mercado, atendendo diferentes faixas de torque e utilizando princ?pios de funcionamento diversos, estes calibradores atendem ?s exig?ncias das normas de qualidade e confiabilidade. Entretanto, atualmente n?o h? a op??o de um padr?o de torque que atenda, com baixo custo, a calibra??o de torqu?metros em v?rias faixas utilizando-se apenas um padr?o. O objetivo deste trabalho ? o desenvolvimento e avalia??o de um padr?o de torque cuja concep??o permita a calibra??o de torqu?metros em tr?s faixas nominais distintas atrav?s de um instrumento com um ?nico padr?o, propiciando redu??o de custos e tempo de execu??o, al?m de disponibilizar maior confiabilidade na qualifica??o final dos instrumentos medidores de torque. Para um adequado atendimento da demanda na calibra??o de torqu?metros, ? necess?rio que laborat?rios de calibra??o e ensaios possuam uma cole??o de padr?es de torque, cada qual apto a atender uma ?nica faixa nominal, o que se torna oneroso. O desenvolvimento do padr?o de torque mostrou-se vi?vel t?cnica e economicamente, possibilitando a calibra??o de torqu?metros em diferentes faixas nominais atrav?s de um ?nico sistema de medi??o vers?til, eficiente e de simples opera??o

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