Magnetic core and process for producing same

A magnetic core and soft magnetic technology, which is applied in the manufacture of inductors/transformers/magnets, magnetic cores/yokes, and magnetic properties of inorganic materials. The effect of reducing intensity and man-hours

Inactive Publication Date: 2015-06-03
NTN CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Conventionally, as magnetic cores for induction hardened coils, for example, FLUXTROL A (trade name manufactured by Fluxtrol Co., Ltd.) in which iron powder is fixed with fluororesin, and Polyiron (Polyairon, NEC Tokin (NEC Tokin) in which sendust powder is fixed with phenolic resin) have been used, for example. Co., Ltd. product name), etc., but the strength of these materials is low, and there are problems such as cracking when thin-walled cutting, and damage when the coil is installed.

Method used

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  • Magnetic core and process for producing same
  • Magnetic core and process for producing same
  • Magnetic core and process for producing same

Examples

Experimental program
Comparison scheme
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Embodiment 1、 comparative example 1 and comparative example 2

[0073] 97.3 g of iron powder particles passing through 100 mesh but not passing through 250 mesh and 2.7 g of epoxy resin powder containing dicyandiamide as a curing agent were mixed at room temperature for 10 minutes with a stirrer. This mixture was put into a kneader, and it heated and kneaded at 110 degreeC for 15 minutes. The aggregated cakes were taken out from the kneader, cooled, and pulverized with a pulverizer. Next, compression molding was performed at a molding pressure of 400 MPa using a mold. The compression-molded product was taken out from the mold, and cured at a temperature of 180° C. under a nitrogen atmosphere for 1 hour. Furthermore, cutting processing is performed, and a magnetic core is manufactured.

[0074] In addition, the above-mentioned ring-shaped test piece for measuring magnetic properties was produced, and the magnetic properties were measured by the above-mentioned method. In addition, a test piece having a thickness of 10 mm×25 mm×3 mm was p...

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Abstract

Provided are a magnetic core which can be produced more efficiently without increasing the raw material cost and which has required magnetic properties and mechanical properties, and a process for producing the magnetic core. The magnetic core is produced by compacting a powder of an iron-based soft-magnetic material in which the particles have a resinous coating film formed on the surface, and then thermally hardening the compact. The resinous coating film is an uncured resinous coating film formed by dry-mixing the powder with an epoxy resin containing a latent hardener at a temperature that is not lower than the softening temperature of the epoxy resin and is lower than the thermal-hardening initiation temperature thereof. The compaction is production of a compact using a mold. The thermal hardening is conducted at a temperature which is not lower than the thermal-hardening initiation temperature of the epoxy resin containing a latent hardener.

Description

technical field [0001] The present invention relates to a magnetic core and a manufacturing method thereof, in particular to an iron-based soft magnetic core installed in a heating coil portion of an induction hardening device and a manufacturing method thereof. Background technique [0002] The magnetic core has the effect of being installed on the back of the coil to concentrate the magnetic force lines on the workpiece, increasing power, and promoting induction heating, and on the contrary, it is installed on the front of the coil to shield (shield) the magnetic force lines and prevent heating of parts that do not need quenching. Indispensable parts for heating coils of induction hardening equipment. [0003] For example, when the shape of the workpiece undergoing induction hardening is complex and the quenching depth needs to be adjusted, the state of induction heating can be changed by changing the shape, size, quantity, direction, position, etc. of the installed cores,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01F1/26H01F27/255H01F41/02B22F1/102
CPCH01F1/26H01F3/08H01F41/0246B22F2998/10C22C2202/02B22F1/102B22F9/04B22F3/02B22F2003/248H01F27/255H01F1/22
Inventor 上本育男宫崎真二原野拓治森夏比古野田浩行
Owner NTN CORP
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