SHEET HYDROFORMING PROCESS
Sheet hydroforming (fluid forming), is forming process whereby pressurized water forms sheet metal. the lower die is effectively the water chamber and dies face. The punch contains the shape of the part and the upper binder, called the blank holder, provides material draw in control. As the punch pushes the material into the water chamber, flow out of the lower side is controlled by a pressure relief valve and water pressure can be adjusted and controlled throughout the full stroke of the press. Water pressure and blank holder forces are consoled and monitored by the systems computer or PLC.
The one advantage of sheet hydroforming is higher formality when compared to conventional stamping.. shown below is a comparison of conventional stamping to sheet hydroforming. Conventionally, forming limitations at the punch shoulder A and die radius B, normally show thinning and splits.
In sheet hydroforming, water pushes the sheet firmly to the punch. Instead of areas of localized thinning, the blank stretches evenly all across the surface. Additionally, the blank is pushed away from the die radius reducing shock lines and thinning.
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