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Preparation method of ferrite for microwave production and die arrangement thereof

A technology of ferrite and microwave oven, which is applied in the field of preparation of ferrite for microwave oven, can solve the problems of poor flexibility, not high enough, affecting the performance of microwave oven, etc., and achieves the effect of improving magnetic field and qualification rate and wide application range

Active Publication Date: 2006-07-19
GUANGZHOU JIECI MAGNETIC IND CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The magnetic field lines of the forming magnetic field of this technology are basically distributed at a certain oblique angle to the axial direction, and the angle belongs to the category of a scalar (no change after the angle is fixed); at the same time, when the mold structure is fixed, the magnetic field line distribution of the magnetic field has an incomparable Denaturation, poor flexibility; In addition, because the magnetic orientation of the product does not have the ability to focus to a fixed point (the size of the magnetic field strength at any point depends on the number of magnetic force lines passing through this point, the purpose of focusing is to make as many magnetic force lines as possible pass through this point ) trend, so the middle air gap magnetic field is still not high enough to affect the performance of the microwave oven

Method used

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  • Preparation method of ferrite for microwave production and die arrangement thereof
  • Preparation method of ferrite for microwave production and die arrangement thereof
  • Preparation method of ferrite for microwave production and die arrangement thereof

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Embodiment

[0021] figure 1 and figure 2 shows the concrete structure of the present invention, by figure 1 and figure 2 It can be seen that the magnetic steel mold for producing ferrite for microwave ovens comprises a die 1, an upper die 2, a coil 3, a water-absorbing plate 4, a NdFeB permanent magnet 5, a non-magnetic block 6, a mandrel 7, a punch 8, Cemented carbide cavity wall 9, non-magnetic block 10; the upper mold 2 is located on the upper side of the mould, the die 1, mandrel 7, punch 8 are opposite to the upper mold 2 and are arranged on the lower side of the mould, the mandrel 7 , The punch 8 extends into the through hole of the die 1, the cemented carbide cavity wall 9 and the die 1 are integrated through thermal expansion treatment, the punch 8 and the cemented carbide cavity wall 9 are fitted and connected, and the mandrel 7 extends into the through hole of punch 8; coil 3 is arranged on the outside of die 1; The non-magnetic block 6 is located on the outside of the NdF...

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Abstract

The related preparation method for ferrite in microwave oven comprises: crushing the pre-calcinined ferrite into powder material; adding water into the powder to grind into slurry with additive; putting the slurry into an alnico mold with magnetic contour as focus distribution and continual-vatiable included angle between magnetic contour and axial direction; and sintering the formed biscuit into a calcinied one. The opposite mold for former method comprises an upper film embedded a permanent magnet with Nd, Fe and B; and a lower film with a convex mold welted by a magnetic-conductive block and an inverse block with a combination surface as arc. This invention is more convenient to improve the intermediate air-gap magenetic field and up-to-standard rate, and fit to variable request by setting ifferent focus point.

Description

technical field [0001] The invention relates to the preparation technology of ferrite, in particular to a preparation method and mold for producing ferrite for microwave ovens. Background technique [0002] In the production of ferrite for existing microwave ovens, the formed magnetic orientation is axially distributed, so the magnetic field in the middle air gap, that is, the magnetic field strength of the working surface is not high enough, which affects the performance of the microwave oven. In order to overcome the shortcomings of the prior art, the Chinese Invention Patent No. 02111649.0 discloses "a method for producing microwave oven magnetic steel". The magnetic steel mold whose axis is distributed obliquely magnetizes the blank, so that the produced microwave oven magnetic steel has a high intermediate air gap magnetic field. The magnetic field lines of the forming magnetic field of this technology are basically distributed at a certain obliqu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/26C04B35/622C04B35/64
Inventor 谢金强龚小辉李锦华
Owner GUANGZHOU JIECI MAGNETIC IND CO LTD
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