Internal high pressure forming method for a workpiece
AssigneeDaimlerChrysler AG
InventorsPierre Bonny, Matthias Schroeder, Stefan Schwarz
Life of this patent
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Abstract
A method and an apparatus are provided for internal high-pressure forming of a workpiece in a closed internal high-pressure forming die. The workpiece is expanded owing to the internal high fluid pressure exerted by a pressure generator and coming to rest on the cavity of the forming die. The workpiece and the forming die form friction partners in the areas of contact. In order to improve process reliability during the internal high-pressure forming of workpieces and to expand the scope of the method, vibration is imparted directly to at least one of the friction partners by a vibration generator during forming.
Claims22
Method for internal high-pressure forming of a workpiece in a closed internal high-pressure forming die, the workpiece being expanded owing to the internal high fluid pressure exerted by a pressure generator and coming to rest on the cavity of the forming die, the workpiece and the forming die forming friction partners in the areas of contact, wherein vibration is imparted directly to at least one of the friction partners by a vibration generator during forming.
Apparatus for internal high-pressure forming of a workpiece with an internal high-pressure forming die that is split in a direction of extension of the workpiece and is connected to a fluid-pressure generator, the forming die and the workpiece forming friction partners when the workpiece is expanded, and with at least one sealing ram, by way of which the workpiece can be sealed axially,
- wherein the apparatus includes at least one vibration generator, which is coupled in a vibrationally effective manner to at least one of the friction partners.
A method of making a workpiece, comprising:
- placing a hollow workpiece blank in a high pressure forming die,
- applying high pressure fluid to inside the hollow blank to plastically deform the hollow blank to rest against internal surfaces of the forming die with the workpiece blank and the forming die forming friction partners in respective areas of contact with one another, and
- imparting vibration forces to at least one of the friction partners during deforming of the hollow blank by the high pressure fluid.
Dependencies are inferred from the claim text.