gráficos de controle
TRANSCRIPT
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O que são gráficos de controle?Qual sua finalidade?Como montar um gráfico de
controle?
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Fabricação
Variabilidade inevitável
MáquinaOperador
Matéria primaFornecedores
AmbienteFerramenta
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Shewardt1924
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CONTROLE POR VARIÁVEIS: aspectos mensuráveis como peso, dimensão, densidade, dureza, concentração, etc
CONTROLE POR ATRIBUTOS: aspectos classificados, tais como passa/não-passa, com trinca/sem trinca,
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Gráfico de controle é um tipo específico de gráfico que serve para acompanhar a variabilidade de um processo.
São empregados para evitar, reduzir ou eliminar não conformidades em tempo real (durante o processo de produção);
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tempo
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icad
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alid
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LM
LIE
LSELSC
LIC
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Gráficos de controle
LM: linha central LSE: limite superior de especificação LSC: limite superior de controle LIC: limite inferior de controle LIE: limite inferior de especificação
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O processo está sob controle quando: Todos os pontos do gráfico estão dentro
dos limites de controle (LIC e LSC). A disposição dos pontos dentro dos
limites é aleatória.
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Processo fora de controle: Variação extrema Tendência Desvios Ciclos Falta de variabilidade
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LSC = X + k. σ LM = XLIC = X - k. σ
Sendo:
Onde k=3
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Fabricação de um eixo para motor elétrico.
Diâmetro requerido: 10 +- 0.2 mm
Limite Superior de EspecificaçãoLSE: 10.2
Limite Inferior de EspecificaçãoLIE: 9.8
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Coleta de dados n=30:
n D n D n D1 10,01 11 10,11 21 10,152 10,09 12 10,12 22 10,13 10,05 13 10,13 23 10,074 9,98 14 10,14 24 105 9,97 15 10 25 10,026 9,96 16 10 26 10,037 10,08 17 10 27 10,18 10,09 18 10 28 109 10,1 19 10 29 9,9810 10,1 20 9,2 30 9,99
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Cálculos:
Media: X = 10,019 Desvio padrão: σ = 0,162221 3σ = 0,486663
LSC = 10,50566 LIC = 9,532337
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Coleta de dados n=30:n D n D n D1 10,01 11 9,95 21 10,152 10,09 12 9,97 22 10,13 10,05 13 9,98 23 10,074 9,98 14 10,01 24 105 9,97 15 10 25 10,026 9,96 16 10 26 10,037 10,08 17 10 27 10,18 10,09 18 10 28 109 10,1 19 10 29 9,9810 10,1 20 9,99 30 9,99
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Cálculos:
Media: X = 10,02333 Desvio padrão: σ = 0,052035 3σ = 0,156106
LSC = 10,17944 LIC = 9,867228
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O que são gráficos de controle?Qual sua finalidade?Como montar um gráfico de
controle?
![Page 28: Gráficos de Controle](https://reader035.vdocuments.pub/reader035/viewer/2022062300/5571f7e849795991698c403b/html5/thumbnails/28.jpg)
Bibliografia
http://www.fag.edu.br/professores/pos/MATERIAIS/Grafico-Controle-Cap2
http://artigocientifico.tebas.kinghost.net/uploads/artc_1243345704_47.pdfA-2008.pdf
http://www.liberato.com.br/upload/arquivos/0121080808570219.pdf