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Soft magnetic iron core press formed from powdered iron in automobile ignition coil and its manufacturing method

A technology for automobile ignition coils and soft magnetic cores, which is applied in the manufacture of inductors/transformers/magnets, transformer/inductor cores, and the magnetism of inorganic materials. It can solve problems such as low coercivity and high magnetic flux density, and achieve a The effect of good precision, high density and easy access to raw materials

Inactive Publication Date: 2003-04-30
李延军
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The technical problem to be solved by the present invention is that the soft magnetic core manufactured by powder metallurgy technology can overcome the above-mentioned shortcomings of the silicon steel laminated iron core and its production. The forming process is simple and can process various complex structural shape requirements High-quality soft magnetic products save materials and make the utilization rate of materials almost 100%. Its electromagnetic properties have its unique advantages: low iron loss, low loss, large initial permeability, high magnetic flux density, and low coercivity strength, which is difficult to achieve with the iron core made of silicon steel sheets

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Choose iron powder with an average particle size of 65, 80, 100, and 200 mesh as the raw material, and the weight ratio of iron powder and phenolic resin is 100:5. The soft magnetic core is produced through the process of preparing ferromagnetic powder-compression molding-curing treatment. The specific process is that the iron powder is put into the ethanol solution of phenolic resin with a concentration of 15%, and the metal powder is bonded and granulated so that the thermosetting resin is fully coated on the surface of the metal particles, and the atomization equipment is used to uniformly granulate three times. Ferromagnetic powder is obtained by drying each time; put the ferromagnetic powder into the mold respectively, at room temperature and at 2, 6, 8, 10, 15, 20T / cm 2 Under pressure, it is pressed into a cylindrical initial piece; finally, the initial piece is naturally invalidated at room temperature for 15 hours, and then it is subjected to step-wise heating a...

Embodiment 2

[0030] Make soft magnetic core by the technical process of embodiment 1. Use 100 mesh iron powder as raw material, with 10t / cm 2 The pressure-pressed initial piece, the proportion by weight of phenolic resin and iron powder is 15%, 10%, 5%, 3%, 1%, 0.5% respectively. The density of the soft magnetic core and the inductance of the automobile ignition coil made of the soft magnetic core were measured, and the results are shown in Table 2.

[0031] weight ratio

[0032] The measurement of the inductance in Table 2 is carried out under the frequency condition of 1000Hz. It can be seen from Table 2 that the performance of the soft magnetic core is better if the proportion of phenolic resin and iron powder is less than 1% by weight.

Embodiment 3

[0034] The soft magnetic core is produced according to the process of Example 1, and after curing, secondary curing and anti-rust insulation treatment are carried out. The specific process is as follows: immerse the cured soft magnetic core in 10-20% alcohol phenolic resin solution for 1-20 minutes, and take out the iron core in 3-10 minutes as long as there are no bubbles in the solution. The excess phenolic resin solution was removed, and the temperature was raised and lowered stepwise at 80-160°C in an oven, and finally cooled to room temperature. The stepwise heating and cooling can be as follows: heating the soft magnetic core impregnated in the aldol phenolic resin solution to 80±5°C for 0.5-1.5h, and then keeping it at 120±5°C for 1.5-2.5h, After heating up, keep it at 160±5°C for 0.5-1.5h, then lower the temperature to 80±5°C and keep it at 0.5-1h, and finally cool down to room temperature naturally. In this way, it not only plays the role of stress relief for the sec...

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Abstract

A method to produce soft magnetic core formed by iron powder pressed in ignition coil of automobile uses iron powder and phenolic resin as a raw materials and the iron core is made in the shape of cylinders and rings which are formed by pressing with its manufacturing flow process as preparing iron magnetic powder to be formed by mould pressing-solidifying treatment. The detail process includes putting iron powder into alcohol solution of phenolic resin for obtaining the iron magnetic powder by granulating with sticking and cladding, putting the iron magnetic powder into a mould for obtainingthe primary piece by cold or warm pressing, carrying out the secondary solidifying as well as the treatments of antirust and insulation after the primary piece being processed by solidifying with thetemperature rising step by step.

Description

technical field [0001] The invention relates to a soft magnetic core used as a dry ignition coil of an electric injection internal combustion engine, and also relates to a manufacturing method of the soft magnetic core pressed and formed by iron powder. Background technique [0002] With the development of the modern automobile industry, the application of environmentally friendly and energy-saving materials in automobiles is a permanent development direction. The original carburetor car is gradually replaced by the car using EFI technology. The ignition function of the EFI technology car mainly depends on the ignition coil. Work to achieve, and the performance of the ignition coil depends on the electromagnetic properties of the internal soft magnetic core. [0003] In the past, the iron cores used in automobile ignition coils were mainly made of bulky silicon steel sheets. It is difficult to make special and complex shapes by silicon steel sheet lamination molding process...

Claims

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Application Information

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IPC IPC(8): H01F1/14H01F1/22H01F27/24H01F41/02
Inventor 李延军周向东贺天民
Owner 李延军
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