Browsing by Author "Pajula, Matti"
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Insinööritieteiden korkeakoulu | Bachelor's thesis(2013-04-22) Pajula, Matti - Utilization of model-based definition within mechanical design and manufacturing
Insinööritieteiden korkeakoulu | Master's thesis(2016-04-18) Pajula, MattiModel-based definition is a design method in which all the product and manufacturing information of a part is included in the 3D-model, instead of a conventional 2D-drawing. The objective of this thesis was to determine the possibility to implement model-based definition to the currently used systems of a target company. Another target was to determine how the data transfer between various organizations could be conducted without the 2D-drawings. In addition, the utilization of the 3D-models within manufacturing processes and the possible benefits within the entire process considering time savings and quality improvements were investigated. Several sources indicate that model-based definition offers various advantages over the conventional 2D-definitions. The benefits include time savings within design, reduction of misunderstandings in the design documents, and the extraction of tolerances and annotations of a 3D-model in the manufacturing processes. To verify the claimed benefits, several studies were conducted. The studies were related to the design processes, design items, manufacturing processes and implementation of model-based definition in two CAD-software. The CAD-software used in the target company is capable of generating fully defined 3D-models with no additional investments. Regarding the manufacturing processes investigated within this thesis, it can be stated that almost every manufacturer is capable of utilizing 3D-models. However, there are various software used among the manufacturers, for which so-called neutral formats need to be used. By using the neutral formats, parts of the intelligence within the models disappear and the reuse possibility of the model properties becomes more difficult. In conclusion, including all the product and manufacturing information to the 3D-model makes the product definition unambiguous and eliminates the possibility of differences between the 3D-model and the 2D-drawing. In addition, the geometry is generally easier to understand in a 3D-format. However, no time savings in the design phase could be achieved in the time studies conducted during the thesis. Certain time saving could most likely be achieved if the design tools of model-based definition were more sophisticated and more familiar to the designers. Due to several software among the manufacturers, further studies on how the fully defined 3D-models and neutral file formats can be utilized within the software, should be conducted. Hence, the utilization of model-based definition should be tested in a pilot project. - Vesipohjaiset tapetti- ja pakkauspainovärit
Helsinki University of Technology | Master's thesis(1996) Pajula, Matti