Pressing apparatus and method for manufacturing laminated cores

JP2026120983AActive Publication Date: 2026-07-23KOMATSU SEIKI KOSAKUSHOKK
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Patent Information

Authority / Receiving Office
JP · JP
Patent Type
Applications
Current Assignee / Owner
KOMATSU SEIKI KOSAKUSHOKK
Filing Date
2025-01-10
Publication Date
2026-07-23

AI Technical Summary

Technical Problem

High-strength soft magnetic foil materials used in laminated cores face challenges in press-punching due to high mold load and significant burr formation, which leads to tool breakage and wear, particularly when conventional shear designs are ineffective.

Method used

A press working apparatus with a punch featuring a specific shear angle range (0.23 to 0.68 degrees) on the punch side, combined with a method of stacking and fixing punched materials to reduce mold load and burr height, utilizing a punch with a first edge, a second edge, and an inclined surface, and optimizing shear parameters.

Benefits of technology

Reduces mold load, suppresses burr height, and extends die lifespan by minimizing die maintenance, ensuring high-quality laminated core production.

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Abstract

This technology reduces the load on the die when press-punching high-strength soft magnetic foil material, and also suppresses the height of burrs on the punched material. [Solution] A press processing apparatus 10 is provided with a punch 12 and a die 14, which punches out a plate-shaped workpiece 18 conveyed between them by the downward movement of the punch 12, and recovers the punched material 20 as a product, wherein the workpiece 18 is made of a high-strength soft magnetic foil material such as an iron-based amorphous alloy foil, and a shear 40 is provided only on the punch 12 side, and this shear 40 is composed of a first edge E1 formed at the tip of the punch 12, a second edge E2 formed on the side of the punch 12, and an inclined surface 12a connecting the first edge E1 and the second edge E2, and the shear angle, which is the angle between the horizontal surface H in contact with the first edge E1 and the inclined surface 12a, is set within the range of 0.23 to 0.68 degrees.
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