Hydro mechanical deep drawing combines the features of conventional deep drawing and hydro forming. In this process, the punch deforms the blank to its final shape by moving against a controlled pressurized fluid. Hydro mechanical deep drawing offers several advantages over conventional deep drawing like higher drawability, uniform strain distribution, better surface finish and improved dimensional accuracy. The objective of this work was to experimentally study the hydro mechanical deep drawing process as a means of shaping Inconel 625, a nickel-based super alloy sheets. In hydro mechanical deep drawing one side surface of the sheet metal is supported with pressurized fluid to assist forming. The effect of applying a varying pressure to the surface of Inconel 625 sheet was evaluated. In hydro mechanical deep drawing process it is necessary that an optimum fluid pressure-punch travel path is to be maintained in order to achieve maximum forming depth. The optimum fluid pressure-punch travel path is to be traced in the working zone between the rupture and wrinkle zones. A user interface to control fluid pressure-punch travel path was developed using commercial software LabVIEW. The punch travel was coupled with the liner variable transducer which in turn sends signal to the LabVIEW with the help of data acquisition card. According to the signal the fluid pressure was controlled between the wrinkle and rupture zones. Experiments were conducted by varying the process parameters such as blank thickness and blank diameter. The results obtained from the experimental work are useful to get optimum combination of parameters to obtain maximum forming depth.

An Experimental Investigation of Hydro Mechanical Deep Drawing of Super Alloy Cups

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An Experimental Investigation of Hydro Mechanical Deep Drawing of Super Alloy Cups