Invention Grant
- Patent Title: Method and tool for precision cutting
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Application No.: US12223570Application Date: 2007-02-02
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Publication No.: US10022770B2Publication Date: 2018-07-17
- Inventor: Willi Grimm
- Applicant: Willi Grimm
- Applicant Address: CH Lyss
- Assignee: Feintool International Holding AG
- Current Assignee: Feintool International Holding AG
- Current Assignee Address: CH Lyss
- Agency: Norris McLaughlin & Marcus, P.A.
- Priority: EP06090018 20060203
- International Application: PCT/EP2007/001106 WO 20070202
- International Announcement: WO2007/090658 WO 20070816
- Main IPC: B21D28/16
- IPC: B21D28/16 ; B21D28/26

Abstract:
A method and tool for producing workpieces with small corner radii in relation to the cutting thickness and with greatly reduced draw-in by precision cutting in a precision cutting tool includes clamping the workpieces between two tool parts consisting of a respective top and bottom cutting dies and of a top and a bottom cutting punch. The workpiece is machined in a one-stage arrangement in at least two successive cutting sequences in different cutting directions with the following partial steps: (A) cutting out a semifinished product, matched to the workpiece geometry, in a first cutting operation in a vertical working direction with slight draw-in, and (B) finish cutting of the semifinished product, produced in step (A), in at least one further cutting operation in a working direction opposed to step (A), wherein the draw-in of partial step (A) is filled again at least in the corner region.
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