Stainless steel sinks are made by deep-drawing. The sheet metal cut is stabilized with high force between the so called blankholder and a die. Then one (or more) drawing punch passes through the die and is forming the workpiece to be shaped.
The principle of the adaptive blankholder was developed by us.
Adaptive blank holding is a patented process in which an additional array of pistons is located at the level of the blankholder to optimize the distribution of the plate holding force. An optimal distribution of surface pressure on the plate is necessary for the production of a correctly drawn metal part.
In the picture left to see is a prototype, the right shows the drawing cushion used for production. Our original method is based on a design-dependent regulation of forces and requires no active NC control for optimal pressure distribution.
Manufacturers today use the adaptive blankholding. However, a sufficiently good distribution of the total force is not achived with the inherent physics of hydraulics, but by complex valve installment under NC control. This of course has the advantage of data collection for process analysis.
Our self-regulating process reacts to thickening of the plate and the forces during the drawing process. Adaptive sheet blankholding improves wrinkling and tearing behavior already in early sample draws.
In the production of parts can be drawn deeper and faster, inferior sheet quality used or simply a better part quality can be achieved.