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ABSTRACT Single point incremental forming (SPIF) is a novel sheet metal forming process. Owing to unique deformation mechanism, this process improves the sheet formability as compared to the conventional stamping process. In the current... more
ABSTRACT Single point incremental forming (SPIF) is a novel sheet metal forming process. Owing to unique deformation mechanism, this process improves the sheet formability as compared to the conventional stamping process. In the current paper, the mechanical properties and spifability (i.e. formability in SPIF) of a wide range of materials were tested. The mechanical properties were mainly determined through tensile testing and the spifability was evaluated using Varying Wall Angle Conical Frustum (VWACF) test. Each mechanical property was drawn against the improvement in sheet formability (i.e. difference of spifability and stampability) and the sole most influential property was identified. It was found that the improvement in formability increases with the increasing of true thickness strain at tensile fracture.
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Single point incremental forming (SPIF) has potential to be employed commercially and can replace conventional sheet stamping process if its defects, such as poor geometrical accuracy, can be overcome. In the present article, three... more
Single point incremental forming (SPIF) has potential to be employed commercially and can replace conventional sheet stamping process if its defects, such as poor geometrical accuracy, can be overcome. In the present article, three forming defects, namely, squeezed out wall formation, corner fold corner, and bulge height, are introduced. It is demonstrated that the formation of these defects has adverse effect on the formability in SPIF. In order to eliminate, if possible, the formation of these defects, the potential effect of operating (i.e., tool radius and step size), geometrical (i.e., wall angle), and material (i.e., sheet thickness and material property) parameters and their interaction on the defect formation and growth has been quantitatively investigated by employing response surface design method. With the help of proposed empirical models, the investigated defects can be overcome through parametric optimization.
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Single point incremental forming (SPIF) is relatively a novel sheet forming process to produce small lots with low cost. In this paper, guidelines for tool size selection for SPIF of an aerospace grade alloy (AA-2024) are presented. The... more
Single point incremental forming (SPIF) is relatively a novel sheet forming process to produce small lots with low cost. In this paper, guidelines for tool size selection for SPIF of an aerospace grade alloy (AA-2024) are presented. The role of tool size, with respect to sheet thickness employed, on the formability in SPIF (i.e., spifability) is clarified. The response surface
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ABSTRACT Single-point incremental forming (SPIF) has the potential to replace conventional sheet forming processes for customized and small batch size sheet metal products. In this research work, the operating parameters (i.e. step size,... more
ABSTRACT Single-point incremental forming (SPIF) has the potential to replace conventional sheet forming processes for customized and small batch size sheet metal products. In this research work, the operating parameters (i.e. step size, tool size, and forming speed) which can affect the formability during SPIF process were altered over wide ranges and their effect on the formability of a titanium sheet was investigated. A six-dimensional hyper-surface showing the influence of investigated parameters on the formability was developed by using a response surface methodology. The capability of the SPIF process to enhance the cold formability of titanium sheet was also examined. This was carried out by comparing the sheet formability in SPIF and stamping processes.
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Page 1. New Methodologies for the Determination of Precise Forming Limit Curve in Single Point Incremental Forming Process Ghulam Hussain 1, a , Gao Lin 1, b , Nasir Hayat 1, c , Nameem Ullah Dar 2, d and Asif Iqbal 2, e ...
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A comparison has been made of the mechanical properties of gravity and squeeze cast aluminium alloys that have been grain refined using gas bubbling and those that have not. To find the optimum gas bubbling conditions, the alloy melt... more
A comparison has been made of the mechanical properties of gravity and squeeze cast aluminium alloys that have been grain refined using gas bubbling and those that have not. To find the optimum gas bubbling conditions, the alloy melt temperature, the gas flow rate and the gas bubbling times were varied over wide ranges. The microstructure of the gas bubbled gravity and squeeze cast materials is fine, equiaxed and non-dendritic with an average primary α size of 52 μm and 163 μm respectively. However, gas bubbling has no effect on the morphology of the eutectic Si. There seems to be no noticeable difference between the measured mechanical properties of the gravity and squeeze cast materials with or without the gas bubbling. The lack of improvement in the mechanical properties of the gravity cast alloy is due to casting defects and porosity, which offset the effects of the grain refinement. The crystal separation and showering mechanisms are operative for the formation of equiaxed grains.
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This paper examines the application of genetic algorithms to a scheduling problem in which n jobs are to be scheduled on a single and parallel identical machines with an objective to minimize the total flow time. The jobs are divided into... more
This paper examines the application of genetic algorithms to a scheduling problem in which n jobs are to be scheduled on a single and parallel identical machines with an objective to minimize the total flow time. The jobs are divided into mutually exclusive classes and a setup task is required when processing switches from a job of one class to
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Page 1. New Methodologies for the Determination of Precise Forming Limit Curve in Single Point Incremental Forming Process Ghulam Hussain 1, a , Gao Lin 1, b , Nasir Hayat 1, c , Nameem Ullah Dar 2, d and Asif Iqbal 2, e ...
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Increased concern for environment has led to the search for more environment friendly sources of energy. Wind energy can be a viable option in this regard. Vertical axis wind turbines offer promising solution for areas away from the... more
Increased concern for environment has led to the search for more environment friendly sources of energy. Wind energy can be a viable option in this regard. Vertical axis wind turbines offer promising solution for areas away from the integrated grid systems. However, they have certain drawbacks associated with different configurations. This paper reviews various configurations of VAWT along with their
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ABSTRACT Single-point incremental forming (SPIF) has the potential to replace conventional sheet forming processes for customized and small batch size sheet metal products. In this research work, the operating parameters (i.e. step size,... more
ABSTRACT Single-point incremental forming (SPIF) has the potential to replace conventional sheet forming processes for customized and small batch size sheet metal products. In this research work, the operating parameters (i.e. step size, tool size, and forming speed) which can affect the formability during SPIF process were altered over wide ranges and their effect on the formability of a titanium sheet was investigated. A six-dimensional hyper-surface showing the influence of investigated parameters on the formability was developed by using a response surface methodology. The capability of the SPIF process to enhance the cold formability of titanium sheet was also examined. This was carried out by comparing the sheet formability in SPIF and stamping processes.
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... For applying the lubricant to the surface of sheet-metal and ensuring its presence throughout ... The selection of lubricant and tool is the beginning point for incremental forming of titanium ... These investigations led to the... more
... For applying the lubricant to the surface of sheet-metal and ensuring its presence throughout ... The selection of lubricant and tool is the beginning point for incremental forming of titanium ... These investigations led to the proper tool, lubricant, and novel lubrication method for cold ...
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ABSTRACT: It is a well established fact that time to market is a key factor in the success of a new product in this era of free trade. The target of reducing time to market can be achieved by accelerating the development process of a new... more
ABSTRACT: It is a well established fact that time to market is a key factor in the success of a new product in this era of free trade. The target of reducing time to market can be achieved by accelerating the development process of a new product. This paper reports a case ...