Fracture types and thickness distribution in superplastic sheets formed with plastic injection molding
Resource
Journal of Materials Processing Technology 120, 133-139
Journal
Journal of Materials Processing Technology 120
Pages
133-139
Date Issued
2002
Date
2002
Author(s)
Parng, S.H.
Yang, S.Y.
DOI
246246/2006111501233203
Abstract
This paper investigates the fracter types and thickness ratio distribution in superplatic Zn/Al sheets formes during a hybrid process combining superplastic sheet forming with plastic injection molding. Three types of sheet fractures, edge cracking, central cracking and combined cracking. are observed. The success of forming superplastic sheets with rib features using injectino molding with various parameters, including melt temperature, injection pressure and mold temperature, are investigated. They are presentes in the form of a molding area with areas of various fracture types. Central cracks occur when superplastic sheets are formed with injection molding with higher melt temperature, while edge cracks occur with higher injection pressure. When the melt flow is parallel to the sheet rolling direction, the areas of edge crack are enlarged. The sheet thickness ratio distribution is obtained for various injection parameters and rib depths. Observation of the sheet thickness distribution for variation parameters, the tendency of the sheet fracture type can be generalized.
Subjects
Superplastic injection molding
Electromagnetic interference
Thickness ratio
Zn-2% Al
Publisher
Taipei:National Taiwan University Dept Chem Engn
Type
journal article
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