Method for producing a helix and permanent mold for casting a helix

US12296375B2 · kind B2 · utility

Assignee

• Fraunhofer-Gesellschaft zur förderung der angewandten Forschung e.V. · DE

Inventors

• Franz-Josef Wöstmann · Bremen, DE
• Michael Heuser · Lake Forest, US
• Matthias Busse · Bremen, DE

Key dates

• Filing date: Sep 19, 2019
• Grant date: May 13, 2025
• Expiry date: Oct 13, 2041

Classification

• Technology area (CPC H): Electricity
• CPC primary: H02K15/0431
• WIPO field: Materials, metallurgy
• WIPO sector: Chemistry

Abstract

A permanent mold can include mold halves which can be joined together on a mold separation plane. The mold halves of the permanent mold are joined together such that the permanent mold has a cavity, which defines the shape of the helix or the shape of a bent-up helix, when the permanent mold is joined together. The specified helix or the bent-up helix has a flattened profiled winding cross-section which has two opposite flat faces, an outer face and an inner face opposite the outer face. The mold separation plane runs at least partly along the flat faces from the inner face to the outer face, wherein the permanent mold has a bulge which extends along the mold separation plane and protrudes into the cavity at least in a region in which the mold separation plane runs along one of the flat faces such that the cast body is provided with recesses on the flat faces.