Fresamento de aço para moldes e matrizes em condições criogênicas
| Ano de defesa: | 2015 |
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| Autor(a) principal: | |
| Orientador(a): | |
| Banca de defesa: | |
| Tipo de documento: | Dissertação |
| Tipo de acesso: | Acesso aberto |
| Idioma: | por |
| Instituição de defesa: |
Universidade Estadual Paulista (Unesp)
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| Programa de Pós-Graduação: |
Não Informado pela instituição
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| Departamento: |
Não Informado pela instituição
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| País: |
Não Informado pela instituição
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| Palavras-chave em Português: | |
| Link de acesso: | http://hdl.handle.net/11449/138493 http://www.athena.biblioteca.unesp.br/exlibris/bd/cathedra/15-04-2016/000864225.pdf |
Resumo: | Steel for molds production are considered difficult-to-cut materials. However, molds require complex shapes with good surface finish and without serious tool damage during the machining. Milling is the most commonly process applied to molds manufacturing given its versatility when producing precisely different geometric shapes. Otherwise, the interrupted cutting cyclically heats and cools the tool which in turn significantly reduces its life and impairs the workpiece surface integrity. Cryogenics has been used in milling processes aiming at stabilizing the thermal cycles in the tool and reducing the harmful effects on the part surface integrity. This research determined the influence of the cooling condition (cryogenic, wet and dry) on tool wear (main and end flank), chip formation (color and shape) and workpiece surface integrity (grain deformation, roughness and microhardeness) when milling Villares VP100 steel (similar to AISI P20 steel) applied to tooling production for plastic injection. The results indicated smaller part roughness and greater tool life when milling cryogenically. Abundant fluid reduced tool life even when compared to dry condition. More significant damages over workpiece surface integrity were found in dry condition, although similar tool life to the cryogenic milling was also reached. Cryogenics favored the VP100 steel milling. Despite the good performance of the dry milling, its application may be infeasible since greater heating may harms the product surface integrity |