Powder injection molding : influence of mixing routes
Powder injection molding (PIM) is a manufacturing process for producing very small parts. There are generally four steps in PIM namely mixing of feedstock, injection molding, debinding and sintering. In this project, the focus is only on the first step, mixing of feedstock. A homogeneous feedstock i...
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| Other Authors: | |
| Format: | Final Year Project (FYP) |
| Language: | English |
| Published: |
2009
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| Online Access: | http://hdl.handle.net/10356/16148 |
| _version_ | 1811692046506786816 |
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| author | Soh, Wei Xiang. |
| author2 | Loh Ngiap Hiang |
| author_facet | Loh Ngiap Hiang Soh, Wei Xiang. |
| author_sort | Soh, Wei Xiang. |
| collection | NTU |
| description | Powder injection molding (PIM) is a manufacturing process for producing very small parts. There are generally four steps in PIM namely mixing of feedstock, injection molding, debinding and sintering. In this project, the focus is only on the first step, mixing of feedstock. A homogeneous feedstock is desired because it is the basis for the whole PIM process. If not done properly, the whole structure might collapse during debinding or sintering, incurring huge losses.
Through Design of Experiments and Analysis of Variance, various factors like mixing temperature, mixing time, powder loading sequence and mixing speed were varied in 2k experiments. In the end, only mixing temperature had significant effect on the response (torques), while the other three factors had little or no influence on the torques.
Homogeneity in this project, was assessed using a quantitative method known as Thermogravimetric Analysis (TGA). Through this method, the homogeneity of the feedstock was correlated to the torques during mixing. During mixing, lower torques mean lower viscosity of the feedstock and the binder system will coat the powder more easily. This will result in a more homogeneous feedstock compared to one with higher torques. However in this project, it was found that higher torques gave better homogeneity instead. This could be due to the combination of certain factors and interactions or the degradation of certain binder system components during mixing at high temperatures. |
| first_indexed | 2024-10-01T06:29:33Z |
| format | Final Year Project (FYP) |
| id | ntu-10356/16148 |
| institution | Nanyang Technological University |
| language | English |
| last_indexed | 2024-10-01T06:29:33Z |
| publishDate | 2009 |
| record_format | dspace |
| spelling | ntu-10356/161482023-03-04T18:31:30Z Powder injection molding : influence of mixing routes Soh, Wei Xiang. Loh Ngiap Hiang School of Mechanical and Aerospace Engineering DRNTU::Engineering::Manufacturing::Polymers and plastics Powder injection molding (PIM) is a manufacturing process for producing very small parts. There are generally four steps in PIM namely mixing of feedstock, injection molding, debinding and sintering. In this project, the focus is only on the first step, mixing of feedstock. A homogeneous feedstock is desired because it is the basis for the whole PIM process. If not done properly, the whole structure might collapse during debinding or sintering, incurring huge losses. Through Design of Experiments and Analysis of Variance, various factors like mixing temperature, mixing time, powder loading sequence and mixing speed were varied in 2k experiments. In the end, only mixing temperature had significant effect on the response (torques), while the other three factors had little or no influence on the torques. Homogeneity in this project, was assessed using a quantitative method known as Thermogravimetric Analysis (TGA). Through this method, the homogeneity of the feedstock was correlated to the torques during mixing. During mixing, lower torques mean lower viscosity of the feedstock and the binder system will coat the powder more easily. This will result in a more homogeneous feedstock compared to one with higher torques. However in this project, it was found that higher torques gave better homogeneity instead. This could be due to the combination of certain factors and interactions or the degradation of certain binder system components during mixing at high temperatures. Bachelor of Engineering 2009-05-21T08:19:49Z 2009-05-21T08:19:49Z 2009 2009 Final Year Project (FYP) http://hdl.handle.net/10356/16148 en Nanyang Technological University 101 p. application/pdf |
| spellingShingle | DRNTU::Engineering::Manufacturing::Polymers and plastics Soh, Wei Xiang. Powder injection molding : influence of mixing routes |
| title | Powder injection molding : influence of mixing routes |
| title_full | Powder injection molding : influence of mixing routes |
| title_fullStr | Powder injection molding : influence of mixing routes |
| title_full_unstemmed | Powder injection molding : influence of mixing routes |
| title_short | Powder injection molding : influence of mixing routes |
| title_sort | powder injection molding influence of mixing routes |
| topic | DRNTU::Engineering::Manufacturing::Polymers and plastics |
| url | http://hdl.handle.net/10356/16148 |
| work_keys_str_mv | AT sohweixiang powderinjectionmoldinginfluenceofmixingroutes |