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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

Investigação na aplicação da teoria de vibração ao teste dinâmico de máquinas-ferramentas

Abi-Zaid, José Antônio Saadi 11 1900 (has links)
Submitted by maria angelica Varella (angelica@sibi.ufrj.br) on 2018-01-05T17:45:05Z No. of bitstreams: 1 130564.pdf: 2154876 bytes, checksum: e8557af60b9db56c0fa6f32ca4b1d23e (MD5) / Made available in DSpace on 2018-01-05T17:45:05Z (GMT). No. of bitstreams: 1 130564.pdf: 2154876 bytes, checksum: e8557af60b9db56c0fa6f32ca4b1d23e (MD5) Previous issue date: 1972-11 / CNPq / BNDES / Investigação da estabilidade dinâmica de um torno de centro nacional. O grau de estabilidade da referida máquina-ferramenta foi determinado de duas maneiras distintas. Primeiramente foram feitos testes de usinagem em peças pré-determinadas a fim de se obter uma carta de estabilidade, relacionando a largura limite de corte com a velocidade superficial da peça. Manteve-se o avanço transversal constante variando sucessivamente as rotações do eixo-árvore. A segunda parte teve por finalidade medir a resposta da máquina à excitação por meio de um vibrador eletrodinâmico, utilizando equipamento automático. Por Último foram comparados os gráficos de estabilidade dinâmica obtidos experimentalmente e, teoricamente, através de três aspectos distintos da teoria de estabilidade com o auxílio de programas de computador. / The main purpose of this work was to investigate the dynamic stability of a national centre lathe. The degree of stability to above referred rnachine tool was determined in two different ways. Firstly, the cutting tests were done on predetermined workpieces to obtain a chart of stability between the lirnit width of cut and the superficial velocity of the workpiece. Maintaining the transverse feed constant and varying sucessively the rotation of the spindle. The second part was measuring the response of the rnachine to excitation by an electrodynarnic vibrator, utilizing automatic equipment. Finally one compared the graphs of dynamic stability obtained experimentally and, theoretically, by considering three distinct aspects of the the theory of stability using the respective cornputer programrnes.

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