Resumo
A comparison has been made between faced hoes manufactured in Brazil and those manufactured in Great Britain. The Brazilian hoes lack uniformity in the raw materials employed in subsequent heat treatments and in the finishing processes. The British hoes were used as a standard for all comparison. Differences between Brazilian and British hoes were due in part to the differences in raw material employed and in part to the different methods of fabrication. In the author's opinion, the Brazilian hoes are of poorer quality because the raw material are very heterogeneous. They come from several sources and there is no process for selection of raw materials. In this regard it is suggested in this paper that the Brazilian factories should buy the raw material at the same source and that this material should be more carefully selected. The British hoes are more uniform and it is assumed that they are made by more modern mechanical processes and that the operations are controlled more rigorously than in Brazil. The author gives tentavite specifications for selection of raw material for the manufacture of faced hoes in Brazil. These specifications cover the chemical composition of the raw material to be employed and the width and height of the facing as well as the heat treatment to which the hoes should be submitted.
As ferramentas e máquinas agrícolas nacionais(1 (1 ) Trabalho recebido para a publicação em janeiro de 1948. ). Constituição química dos materiais empregados na sua fabricação e análise de suas propriedades mecânicas. Parte I As enxadas calçadas
P. J. Roston(2 (2 ) O autor agradece a colaboração do eng. agr. André Tosello, pelas sugestões apresentadas. )
Engenheiro agrônomo, Secção de Mecânica da Agricultura, Departamento de Engenharia e Mecânica da Agricultura, Campinas
SUMMARY
A comparison has been made between faced hoes manufactured in Brazil and those manufactured in Great Britain. The Brazilian hoes lack uniformity in the raw materials employed in subsequent heat treatments and in the finishing processes. The British hoes were used as a standard for all comparison.
Differences between Brazilian and British hoes were due in part to the differences in raw material employed and in part to the different methods of fabrication.
In the author's opinion, the Brazilian hoes are of poorer quality because the raw material are very heterogeneous. They come from several sources and there is no process for selection of raw materials. In this regard it is suggested in this paper that the Brazilian factories should buy the raw material at the same source and that this material should be more carefully selected.
The British hoes are more uniform and it is assumed that they are made by more modern mechanical processes and that the operations are controlled more rigorously than in Brazil.
The author gives tentavite specifications for selection of raw material for the manufacture of faced hoes in Brazil. These specifications cover the chemical composition of the raw material to be employed and the width and height of the facing as well as the heat treatment to which the hoes should be submitted.
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Full text available only in PDF format.
LITERATURA CITADA
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11. Anônimo. Em Standards of the American Society for Testing Materials (A.S.T.M). Parte I : 116 e 206.1939.
- 2. Anônimo. Norma Elaborada pela Comissão de Normas de Emergência da Associação Brasileira de Normas Técnicas (ABNT), em Colaboração com o Setor da Produção Industrial (Coordenação da Mobilização Econômica). Norma de Emergência para Pás para terra, Enxadas e Enxadões 26 : 1945.
- 3. Anônimo. Noções Elementares para o Exercício Prático de Micrografia (Aços comuns esfriados lentamente). Produtos siderúrgicos comuns. Publicação do Instituto de Pesquisas Tecnológicas de São Paulo. Fase. 2 : 6-9. 1940.
- 4. Anônimo. Resumo de Noções Fundamentais para o Exercício Prático de Tratamentos Térmicos. Produtos siderúrgicos comuns. Publicação do Instituto de Pesquisas Tecnológicas de São Paulo. Fase. 3 : 9-10, 27, 1945.
- 5. Guzzoni, G. Em Gli Acciai Comuni e Speciali, pág. 169-183, 339-340 e 632, 2.Ş ed., Ulrico Hoelpi, Milano, Itália. 1939.
- 6. Roston, P. J. Em Relatório da Secção de Mecânica de Agricultura do D.E.M.A 1947: 1-32, figs. 1-22, 1948 (não publicado).
Datas de Publicação
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Publicação nesta coleção
08 Jun 2010 -
Data do Fascículo
Dez 1948
Histórico
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Recebido
Jan 1948
