Method and device for forming sheet metal
AssigneesSMG-Suddeutsche Maschinenbau GmbH, Schuler Werkzeuge GmbH & Co.
InventorHarald Kasmacher
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Abstract
A method and apparatus for shaping a sheet metal blank into a shaped outline is disclosed. The blank is clamped hydraulically between an upper tool and a lower tool with one of the tools having the shaped outline. Hydraulic pressure acts on a side of the sheet metal blank opposite the shaped outline to force the sheet metal blank into the shaped outline. The sheet metal blank, under the controlled action of the hydraulic pressure, is initially preformed to an extension of 10-15% of initial dimensions of the sheet metal blank and then, with continuing hydraulic pressure, the sheet metal blank is finally shaped by drawing without further extension until the sheet metal blank completely conforms to the shaped outline.
Claims16
A method of shaping a sheet metal blank clamped in fluid tight fashion in a parting plane between an upper tool and a lower tool with one of the tools having a shaped outline with the sheet metal blank being formed into the shaped outline by a hydraulic pressure medium acting on a side of the sheet metal blank opposite the shaped outline comprising:
- initially preforming the sheet metal blank under a controlled hydraulic pressure to produce a stretching of 10-15% beyond initial dimensions of the sheet metal blank;
- and
- with continued hydraulic pressure drawing the sheet metal blank without further stretching until the sheet metal blank has the shaped outline.
A method of shaping a sheet metal blank clamped in fluid tight fashion in a parting plane between an upper tool and a lower tool with one of the tools having a shaped outline with the sheet metal blank being formed into the shaped outline by a hydraulic pressure medium acting on a side of the sheet metal blank opposite the shaped outline comprising:
- initially preforming the sheet metal blank under a controlled hydraulic pressure to produce a stretching in accordance with Hookes law beyond initial dimensions of the sheet metal blank until the blank contacts the one of the tools;
- and
- with continued hydraulic pressure drawing the sheet metal blank, without further stretching in accordance with Hookes law, until the sheet metal blank has the shaped outline.
Dependencies are inferred from the claim text.