Method and apparatus for the simultaneous production of several different sheet metal stacks from several stacked electrical steel sheets

The method and device facilitate rapid, high-volume production of sheet metal stacks by using anaerobic adhesives or epoxy/polyurethane hybrids to bond electrical steel sheets during punching and stacking, addressing the inefficiencies of traditional methods and improving production efficiency and product quality.

DE102012001744B4Active Publication Date: 2026-07-02VOLKSWAGEN AG
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Patent Information

Application Number
DE102012001744
Authority / Receiving Office
DE · DE
Patent Type
Patents
Current Assignee / Owner
Filing Date
2012-01-28
Publication Date
2026-07-02
Estimated Expiration
2032-01-28

AI Technical Summary

Technical Problem

Existing methods for producing sheet metal stacks from electrical steel sheets are time-consuming and difficult to integrate into continuous mass production due to the use of baking lacquers or reactive adhesives, which require lengthy heating and cooling processes, and often result in incomplete bonding or damage to the insulating layer, limiting production efficiency and flexibility.

Method used

A method and device that utilize a full-surface coating with anaerobic adhesives or epoxy/polyurethane hybrids applied to electrical steel sheets, activated during punching and stacking, allowing for a single operation to punch, stack, and bond the sheets with short cycle times, using a multi-functional tool and activation devices for rapid adhesive curing.

Benefits of technology

Enables high-volume, high-efficiency production of sheet metal stacks with minimal tool contamination and reduced cycle times, enhancing energy efficiency, product reliability, and cost-effectiveness, while maintaining the integrity of the insulating layer.

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Abstract

Method (10) for the simultaneous production of several different lamination stacks (2) produced from several stacked electrical steel sheets (12), wherein in a device (1) an adhesive (24) of a coating (16) of the electrical steel sheet (12) is activated and the electrical steel sheet (12) is bonded (19) to the lamination stack (2) under the influence of pressure, the electrical steel sheet (12) is punched (14) from a strip of sheet metal (15) immediately before or during stacking, wherein the coating (16) of the strip of sheet metal (15) is applied during the production or finishing of the strip of sheet metal (15) and the strip of sheet metal (15) which is coated (16) on at least one side is fed to the device (1), the adhesive (24) is activated in the device (1) before joining (19) already during the punching (14) and hardens in the device (1), and the punching (14)Stacking and joining (19) of the electrical steel sheets (12) is carried out by means of a multi-function tool (3) designed as a progressive die with several jointly actuated tool segments (27, 28, 29), and the adhesive (24) is activated by the action of temperature, wherein the adhesive (24) becomes active by heating to or above a certain temperature, the reaction temperature, and / or electromagnetic radiation, including ultraviolet radiation and / or infrared radiation.
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