Rosca no torno Prof. Isaac N L Silva Professor Adjunto – PUCRS.
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Transcript of Rosca no torno Prof. Isaac N L Silva Professor Adjunto – PUCRS.
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Rosca no tornoProf. Isaac N L SilvaProfessor Adjunto – PUCRS
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ROSCAS E ROSCAMENTO NO TORNO
Para que servem as roscas?
Fixar peças = roscas triangulares
Transmitir movimento = roscas quadradas, trapezoidais, dente de serra ou redonda
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Dimensões das roscas
As dimensões das roscas são padronizadas e
constam em tabelas
Dimensões mais importantes:
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Roscamento no tornoA rosca é produzida pela ferramenta de roscar devidamente afiada O passo deve ser estabelecido no torno, antes de iniciar o roscamento, por meio de alavancas de controle Deve ser estabelecida uma conexão entre o carro da ferramenta e o parafuso de avanço, unindo a porca partida com a rosca do parafuso de avanço O diâmetro inicial deve ser menor do que o diâmetro nominal da rosca a ser feita, porque o material é “levantado” no roscamento; se isso não for levado em consideração, a rosca pode quebrar
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Esquema para o roscamento no torno
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N.º OPERAÇÃO FERRAMENTA VELOCIDADE
01 Fixar lado A e facear lado B Bits Normal
02 Abrir furo de centro lado B Broca apropriada Normal
03 Puxar a peça mais para fora e apoiar o ponto
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04 Realizar cilindramento 9,3 x 25 Bits Normal
05 Quebrar canto vivo do lado B externo
Bits Normal
06 Sangramento 7,5 x 4 Bedame Normal (latão)Reduzida (aço)
07 Abrir rosca W3/8” – 16 f.p.p. No torno (incluindo determinadas
verificações)
Reduzida
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Sequencia de operaçõesN.º OPERAÇÃO FERRAMENTA VELOCIDADE
01 Fixar lado A e facear lado B Bits Normal
02 Abrir furo de centro lado B Broca apropriada Normal
03 Puxar a peça mais para fora e apoiar o ponto
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04 Realizar cilindramento 9,3 x 25
Bits Normal
05 Quebrar canto vivo do lado B externo
Bits Normal
06 Sangramento 7,5 x 4 Bedame Normal (latão)Reduzida (aço)
07 Abrir rosca W3/8” – 16 f.p.p. No torno (incluindo determinadas
verificações)
Reduzida
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Facear topo até eliminar marcas da serra
Furar com broca “decentro
cilindrar diâmetro 9,3mm por
comp. de 30 mm
Sangrar 18mm por comp. de 20 mm
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Fixar peça para 1ª. operação
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Posicionar a ferramenta para facear, e facear o topo
Fixar o carro longitudinalSempre que usar :o carro transversal ou o carro superior
Inclinação menor que 90
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Furar “decentro”
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Fixar cabeçote móvel
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Movimentar a broca “ decentro”
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Marcar o comprimento a cilindrar
~25 mm
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Criar a referência para a medição do diâmetro com o colar milimétrico
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Cada traço do carro transversal = 0.05mm no
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Cilindrar até 9.3mm
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“Acertar” o comprimento!Novamente fixar
o carro long.
Com o carro transversal, fazendo as medidas no carro superior
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Cada traço do carro superior
= 0.05mm
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Fixação e posicionamento da ferramenta de corte
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Talhar a rosca
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Substituir a ferramenta
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Posicionar a ferramenta
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Escolha das alavancas da “caixa Norton”
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Porca bipartida
Fuso
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