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Fig.7 Schematic of the first strategy forming 1. In the first test, after applying vertical feeding ste size at sheet centre by forming tool (f1), the formin, tool will move toward the sheet boundary. Automati radial feeding of the tool in this motion is f , then th forming tool without imposing secondary load on th sheet boundary, will travel towards the sheet centre. Th above cyc e will continue until the initial tearing appear on the sheet (Fig. 7).

Figure 7 Schematic of the first strategy forming 1. In the first test, after applying vertical feeding ste size at sheet centre by forming tool (f1), the formin, tool will move toward the sheet boundary. Automati radial feeding of the tool in this motion is f , then th forming tool without imposing secondary load on th sheet boundary, will travel towards the sheet centre. Th above cyc e will continue until the initial tearing appear on the sheet (Fig. 7).

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Table 1 Comparison between spinning process and the new method
Table 1 Comparison between spinning process and the new method
Fig.1 Fixture including main base and ring piece Int J Advanced Design and Manufacturing Technology, Vol. 5/ No. 2/ March - 2012
Fig.1 Fixture including main base and ring piece Int J Advanced Design and Manufacturing Technology, Vol. 5/ No. 2/ March - 2012
Fig.4 Attaching the fixture to the chuck
Fig.4 Attaching the fixture to the chuck
Fig.3 = Clamping annealed AI sheet on the fixture
Fig.3 = Clamping annealed AI sheet on the fixture
At the end of the process, the sheet was formed into conical geometry (Fig. 6). The initial formed sample was produced successfully and the ability of this new method for forming symmetric geometries was approved. The presented method will open a new path for researchers and industrialists. In the next section, two strategies for forming process will be studied. 4 EFFECT OF FORMING STRATEGY ON SHEET FORMABILITY
At the end of the process, the sheet was formed into conical geometry (Fig. 6). The initial formed sample was produced successfully and the ability of this new method for forming symmetric geometries was approved. The presented method will open a new path for researchers and industrialists. In the next section, two strategies for forming process will be studied. 4 EFFECT OF FORMING STRATEGY ON SHEET FORMABILITY
Fig.5 Sheet forming process
Fig.5 Sheet forming process
ig. 8 | Schematic of the second strategy forming Int J Advanced Design and Manufacturing Technology, Vol. 5/ No. 2/ March - 2012
ig. 8 | Schematic of the second strategy forming Int J Advanced Design and Manufacturing Technology, Vol. 5/ No. 2/ March - 2012
Fig.9 | Drawing of circle on the back and centre of the sheet Two annealed Al sheets of 1mm thickness were cut to 150mmx150mm dimensions. The study criterion of sheet formability in this process is final forming depth and effective strain (€ ). In order to determine effective strain (based on von-mises yielding criterion), a circle by diameter: dg9=25mm_ was drawn on the back and centre of the sheet by beam compass (Fig. 9). The tests were performed in accordance with the designed process. Sheet surface should be lubricated. Lubrication will decrease the friction between the tool and the sheet surfaceand will absorb deformation heat.
Fig.9 | Drawing of circle on the back and centre of the sheet Two annealed Al sheets of 1mm thickness were cut to 150mmx150mm dimensions. The study criterion of sheet formability in this process is final forming depth and effective strain (€ ). In order to determine effective strain (based on von-mises yielding criterion), a circle by diameter: dg9=25mm_ was drawn on the back and centre of the sheet by beam compass (Fig. 9). The tests were performed in accordance with the designed process. Sheet surface should be lubricated. Lubrication will decrease the friction between the tool and the sheet surfaceand will absorb deformation heat.
Table 2 shows measured diameters dy,d5 and th resultant principal and effective strains. Based on the above results, the ratio of effective strain in the first test to the second test is calculated. &/€2 = 0.243/0.0849 = 2.86 | predominance of the first stratesv in this process has been confirmed again.
Table 2 shows measured diameters dy,d5 and th resultant principal and effective strains. Based on the above results, the ratio of effective strain in the first test to the second test is calculated. &/€2 = 0.243/0.0849 = 2.86 | predominance of the first stratesv in this process has been confirmed again.
Fig. 10 Failure zone in the formed sheet by first strategy Int J Advanced Design and Manufacturing Technology, Vol. 5/ No. 2/ March - 2012
Fig. 10 Failure zone in the formed sheet by first strategy Int J Advanced Design and Manufacturing Technology, Vol. 5/ No. 2/ March - 2012
Fig. 11 Failure zone in the formed sheet by second strategy
Fig. 11 Failure zone in the formed sheet by second strategy
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