CN106024256B - A kind of automobile ignition coil soft magnet core - Google Patents

A kind of automobile ignition coil soft magnet core Download PDF

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Publication number
CN106024256B
CN106024256B CN201610493428.3A CN201610493428A CN106024256B CN 106024256 B CN106024256 B CN 106024256B CN 201610493428 A CN201610493428 A CN 201610493428A CN 106024256 B CN106024256 B CN 106024256B
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soft magnet
magnet core
temperature
insulating wrapped
alloyed powder
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CN106024256A (en
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陈凌
王琰
任琪
程晓
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KPS Wuxi Machinery Technology Co Ltd
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KPS Wuxi Machinery Technology Co Ltd
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F1/00—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties
    • H01F1/01—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials
    • H01F1/03—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity
    • H01F1/12—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of soft-magnetic materials
    • H01F1/14—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of soft-magnetic materials metals or alloys
    • H01F1/147—Alloys characterised by their composition
    • H01F1/14708—Fe-Ni based alloys
    • H01F1/14733—Fe-Ni based alloys in the form of particles
    • H01F1/14741—Fe-Ni based alloys in the form of particles pressed, sintered or bonded together
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/002—Ferrous alloys, e.g. steel alloys containing In, Mg, or other elements not provided for in one single group C22C38/001 - C22C38/60
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/008—Ferrous alloys, e.g. steel alloys containing tin
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/10—Ferrous alloys, e.g. steel alloys containing cobalt
    • C22C38/105—Ferrous alloys, e.g. steel alloys containing cobalt containing Co and Ni
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/12—Ferrous alloys, e.g. steel alloys containing tungsten, tantalum, molybdenum, vanadium, or niobium
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/14—Ferrous alloys, e.g. steel alloys containing titanium or zirconium
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F38/00—Adaptations of transformers or inductances for specific applications or functions
    • H01F38/12—Ignition, e.g. for IC engines
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F41/00—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties
    • H01F41/02—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties for manufacturing cores, coils, or magnets
    • H01F41/0206—Manufacturing of magnetic cores by mechanical means
    • H01F41/0246—Manufacturing of magnetic circuits by moulding or by pressing powder
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F38/00—Adaptations of transformers or inductances for specific applications or functions
    • H01F38/12—Ignition, e.g. for IC engines
    • H01F2038/122—Ignition, e.g. for IC engines with rod-shaped core

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Manufacturing & Machinery (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Dispersion Chemistry (AREA)
  • Hard Magnetic Materials (AREA)
  • Ignition Installations For Internal Combustion Engines (AREA)

Abstract

The invention discloses a kind of automobile ignition coil soft magnet core, the shape of soft magnet core is cylindrical body；The component and content of soft magnet core, by weight percentage, comprising: Ni 2%；Ti 0.2%；Co 0.1%；P 0.15%；Sn 0.1%；V 0.1%；Phenolic resin 1%；Surplus is iron.Wherein, C≤0.02%, O≤0.15%.Soft magnet core is prepared according to following technique: vacuum melting, just crush, it is middle crush, be finely divided, de- liquid, drying, screening, annealing, insulating wrapped, compression moulding and heat treatment.After said components and preparation process, soft magnet core is integrated vertical molding compacting, and briquetting pressure is low, has higher compact density, resistivity, initial permeability, saturation induction density and spectral characteristic, and be lost low.In addition, the surface smoothness of soft magnet core is good, cross section is circular, so that the iron core of certain size is had bigger inductance, provides higher ignition energy for coil.

Description

A kind of automobile ignition coil soft magnet core
Technical field
The present invention relates to automotive engine ignition system, especially a kind of automobile ignition coil soft magnet core.
Background technique
In automotive engine ignition system, ignition coil is mentioned for air and fuel oil mixture in ignition engine cylinder For the execution unit of ignition energy.Its principle based on electromagnetic induction, by being turned off and on the primary circuit of ignition coil, just Then electric current in grade circuit increases to be reduced suddenly again, will incude generation in secondary in this way and light required high voltage.Igniting Coil may be considered a kind of special pulse transformer, it is by the low voltage transition of 10-12V at 25000V or higher electricity Pressure.Currently, more typical is open-flux path pen-type ignition coil comprising constitute the open iron core of ignition coil magnetic circuit, be wound on Secondary copper wire winding on iron core and the primary coil winding being around on the outside of secondary windings.Mainly pass through primary coil winding Electric current is stored as magnetic field.When primary coil windings electric current is abruptly cut (by power transistor disconnecting circuit ground terminal) When, field decay makes secondary coil winding generate induced electromotive force, and the voltage of the induced electromotive force is enough to put pen type coil Electricity, we are called the igniting of inductive discharge formula.In addition also there are CD ignition system, commonly known as the igniting side CDI Formula.
Iron core is core component in ignition coil, and the inductance of iron core directly influences the ignition energy of coil.
Application No. is 201310273684.8 Chinese invention patent application, innovation and creation disclosed on January 1st, 2014 Entitled " a kind of automobile spark plug igniter iron core group ", wherein the first iron core is folded by the punching material strip of multilayer electrical steel strip At and the segment core that connects together be folded into close-shaped annular core；Every layer of punching material strip is by 4 segmentations and bonding pad Connected between composition, the first segmentation and the second segmentation, the second segmentation and third segmentation, third segmentation and the 4th segmentation by bonding pad It connects, and is respectively designed to boss and groove on the first segmentation and the opposite position in outside of the 4th segmentation hingedly to lock；Electricity The grain orientation of work steel band is consistent with the length direction that four are segmented；Second iron core is mounted above the of the connection cyclization mentioned Inside one iron core, it is also to be overrided to form by multilayer electrical sheet punching material strip, and its length direction and electrical sheet grain orientation Unanimously.To have the advantages that save material and reduce cost.
Application No. is the Chinese invention patent application of " 201210485879.4 ", inventions disclosed on 2 27th, 2013 A kind of entitled " the automobile ignition coil core progressive die automatic press counting molding method of lamination riveting " created, it is main It is made of punching machine squeeze riveter, single-chip microcontroller and power control cabinet, the fixed reeling-up reeling-out device of material strip, remaining strip winding device, is set in power control cabinet There is single-chip microcontroller, proximity sensor switch, solenoid valve are equipped on progressive die using proximity sensor switch and carries out memory counting, if Output signal is arranged by single-chip microcontroller numerical value in provisioning request numerical value, controls solenoid valve, and solenoid valve output control cylinder realizes lamination meter Number, sensor is corrected in one mistake proofing of setting also in progressive die, i.e. button is corrected in mistake proofing, controls punching machine and progressive die stops work Make, after being adjusted correctly to equipment, restarts continuous punching work.The present invention improves 10 times of production efficiency, only needs 1 people behaviour Make, product qualification rate is increased to 99.7% from original 85% -90%, reduces production cost.
In above-mentioned two pieces patent application, automobile ignition coil core is all made of after silicon steel sheet stacks, the molding method of riveting It is prepared.For silicon steel sheet when lamination and riveting form, lamination is easy dislocation, there is riveting gap and riveting damage between piece and piece Deng, therefore causing the resistivity of automobile ignition coil core low, initial magnetic permeability and magnetic induction intensity are low, and loss is high, high frequency sound Answer poor, the inductance of iron core is smaller, small so as to cause the ignition energy of coil.
In addition, currently, the manufacture craft of soft magnet core is all using horizontal fixed pressing, detailed process are as follows: by cavity plate It being fixed on mould bases, iron powder is loaded onto cavity plate, suppressed together using upper punching and undershoot, wherein undershoot is a semi-cylindrical, Gu Fixed motionless, cavity plate is also fixed, and upper punching is also a semi-cylindrical, completes pressing process by moving up and down for upper punching.Because Whole iron core is put together by two semi-cylindricals, and certain interface is constantly present between two semicircular, cannot form one completely Circle, keep the inductance of iron core smaller, it is small so as to cause the ignition energy of coil.Meanwhile iron core cross section be similar oval Shape, and there are wider seam, poor surface smoothness in centre.Iron core is made of straight iron powder, has lower resistivity, low Saturation induction density, biggish loss, and high frequency response is poor.
Summary of the invention
In view of the above-mentioned deficiencies of the prior art, the technical problem to be solved by the present invention is to provide a kind of automobile ignition coils With soft magnet core, which is integrated vertical molding compacting with soft magnet core, and briquetting pressure is low, have it is higher at Type density, resistivity, initial permeability, saturation induction density and spectral characteristic, and be lost low.In addition, the table of soft magnet core Face finish is good, and cross section is circular, so that the iron core of certain size is had bigger inductance, provides higher point for coil Fiery energy.
In order to solve the above technical problems, the technical solution adopted by the present invention is that:
A kind of automobile ignition coil soft magnet core, the shape of soft magnet core are cylindrical body；The component of soft magnet core and contain Amount, by weight percentage, comprising: Ni 2-4%；Ti 0.2-0.3%；Co 0.1-0.3%；P 0.15-0.4%；Sn 0.1- 0.3%；V 0.1-0.3%；Phenolic resin 1-2%；Surplus is iron.
Soft magnet core is prepared according to following technique:
Vacuum melting: the first step according to the proportion by iron block and nickel block, puts into and carries out melting casting in vaccum sensitive stove.
Second step just crushes: the alloy that first step melting casting is completed tentatively is crushed using pulverizer.
Middle crushing: the alloy crushed at the beginning of second step under nitrogen protection atmosphere, is first put into selection by winnowing sand mill by third step It is interior, according still further to proportion, Ti, Co, P, Sn and V are sequentially added, selection by winnowing sand mill is opened, is crushed in progress.
4th step, it is finely divided: under protected alcohol atmosphere, the alloy crushed in third step being carried out again using sand mill It is finely divided.
5th step takes off liquid, drying: using the centrifuge alloyed powder finely divided to the 4th step, carrying out de- liquid；Recycle baking oven Alloyed powder after de- liquid is dried.
Screening: 6th step is taken off the alloyed powder that liquid drying is completed to the 5th step and is sieved using vibrating screen.
7th step, annealing: under hydrogen nitrogen mixed gas atmosphere, by the 6th step screening complete alloyed powder use push away boat furnace into Row annealing.
Insulating wrapped: 8th step the alloyed powder that the processing of the 7th step annealing is completed is added in insulating wrapped agitator, then is pressed Phenolic resin and lubricant is added according to proportion, insulating wrapped agitator carries out heating stirring and cladding.
9th step, compression moulding: using moulding press, by the way of vertically vertically suppressing, makes cylindrical soft magnet Core is integrally formed compacting.
Heat treatment: tenth step the soft magnet core of the 9th step compression moulding is heat-treated.
In 7th step, the temperature of annealing is 800-1200 °, keeps the temperature 2-4 hours.
In tenth step, the temperature of heat treatment is 120-200 °, keeps the temperature 4-6 hours.
The heating temperature of the insulating wrapped agitator is 55-65 °, and insulating wrapped agitator includes interior bucket, outer barrel and packet Overlay on the heating device of outer barrel surrounding, interior bucket can rotation and as outer barrel revolves.
Briquetting pressure when cylindrical soft magnet core is integrally formed compacting is 6-12T/cm2, forming temperature 60- 200°。
After the present invention is using said components and preparation process, soft magnet core is integrated vertical molding compacting, and briquetting pressure is low, With higher compact density, resistivity, initial permeability, saturation induction density and spectral characteristic, and it is lost low.In addition, The surface smoothness of soft magnet core is good, and cross section is circular, and the iron core of certain size is made to have bigger inductance, is coil Higher ignition energy is provided.
Specific embodiment
With regard to specific better embodiment, the present invention is described in further detail below.
Embodiment 1
A kind of automobile ignition coil soft magnet core, the shape of soft magnet core are cylindrical body；The component of soft magnet core and contain Amount, by weight percentage, comprising: Ni 2%；Ti 0.2%；Co 0.1%；P 0.15%；Sn 0.1%；V 0.1%；Phenolic resin 1%；Surplus is iron.Wherein, C≤0.02%, O≤0.15%.
Soft magnet core is prepared according to following technique:
Vacuum melting: the first step according to the proportion by iron block and nickel block, puts into and carries out melting casting in vaccum sensitive stove.
Second step just crushes: the alloy that first step melting casting is completed tentatively is crushed using pulverizer.
Middle crushing: the alloy crushed at the beginning of second step under nitrogen protection atmosphere, is first put into selection by winnowing sand mill by third step It is interior, according still further to proportion, Ti, Co, P, Sn and V are sequentially added, selection by winnowing sand mill is opened, is crushed in progress.
4th step, it is finely divided: under protected alcohol atmosphere, the alloy crushed in third step being carried out again using sand mill It is finely divided.
5th step takes off liquid, drying: using the centrifuge alloyed powder finely divided to the 4th step, carrying out de- liquid；Recycle baking oven Alloyed powder after de- liquid is dried.
Screening: 6th step is taken off the alloyed powder that liquid drying is completed to the 5th step and is sieved using vibrating screen.
7th step, annealing: under hydrogen nitrogen mixed gas atmosphere, by the 6th step screening complete alloyed powder use push away boat furnace into Row annealing.The temperature of annealing is 800 °, keeps the temperature 2-4 hours.
Insulating wrapped: 8th step the alloyed powder that the processing of the 7th step annealing is completed is added in insulating wrapped agitator, then is pressed Phenolic resin and lubricant is added according to proportion, insulating wrapped agitator carries out heating stirring and cladding.Insulating wrapped agitator Heating temperature is 55-65 °, and preferably 60 °, insulating wrapped agitator includes interior bucket, outer barrel and the heating for being coated on outer barrel surrounding Device, interior bucket can rotation and as outer barrel revolves, so as to prevent alloyed powder from gluing wall, heating temperature is more equal It is even.After being covered to complete, when being lower than 40 °, the alloyed powder in insulating wrapped bucket can be taken out.Alloyed powder after insulating wrapped Grain distribution needs to meet: 100-200 mesh 10-20%, 200-300 mesh 40-50%, and surplus is the following particle of 300 mesh.
9th step, compression moulding: using moulding press, by the way of vertically vertically suppressing, makes cylindrical soft magnet Core is integrally formed compacting.Briquetting pressure when cylindrical soft magnet core is integrally formed compacting is 6-12T/cm2, forming temperature is 60-200°。
Heat treatment: tenth step the soft magnet core of the 9th step compression moulding is heat-treated.The temperature of heat treatment is 120- 200 °, keep the temperature 4-6 hours.
Embodiment 2
A kind of automobile ignition coil soft magnet core, the shape of soft magnet core are cylindrical body；The component of soft magnet core and contain Amount, by weight percentage, comprising: Ni 3%；Ti 0.25%；Co 0.2%；P 0.3%；Sn 0.2%；V 0.2%；Phenolic resin 1.5%；Surplus is iron.Wherein, C≤0.02%, O≤0.15%.
Soft magnet core is prepared according to following technique:
Vacuum melting: the first step according to the proportion by iron block and nickel block, puts into and carries out melting casting in vaccum sensitive stove.
Second step just crushes: the alloy that first step melting casting is completed tentatively is crushed using pulverizer.
Middle crushing: the alloy crushed at the beginning of second step under nitrogen protection atmosphere, is first put into selection by winnowing sand mill by third step It is interior, according still further to proportion, Ti, Co, P, Sn and V are sequentially added, selection by winnowing sand mill is opened, is crushed in progress.
4th step, it is finely divided: under protected alcohol atmosphere, the alloy crushed in third step being carried out again using sand mill It is finely divided.
5th step takes off liquid, drying: using the centrifuge alloyed powder finely divided to the 4th step, carrying out de- liquid；Recycle baking oven Alloyed powder after de- liquid is dried.
Screening: 6th step is taken off the alloyed powder that liquid drying is completed to the 5th step and is sieved using vibrating screen.
7th step, annealing: under hydrogen nitrogen mixed gas atmosphere, by the 6th step screening complete alloyed powder use push away boat furnace into Row annealing.The temperature of annealing is 1000 °, keeps the temperature 2-4 hours.
Insulating wrapped: 8th step the alloyed powder that the processing of the 7th step annealing is completed is added in insulating wrapped agitator, then is pressed Phenolic resin and lubricant is added according to proportion, insulating wrapped agitator carries out heating stirring and cladding.Insulating wrapped agitator Heating temperature is 55-65 °, and preferably 60 °, insulating wrapped agitator includes interior bucket, outer barrel and the heating for being coated on outer barrel surrounding Device, interior bucket can rotation and as outer barrel revolves, so as to prevent alloyed powder from gluing wall, heating temperature is more equal It is even.After being covered to complete, when being lower than 40 °, the alloyed powder in insulating wrapped bucket can be taken out.Alloyed powder after insulating wrapped Grain distribution needs to meet: 100-200 mesh 10-20%, 200-300 mesh 40-50%, and surplus is the following particle of 300 mesh.
9th step, compression moulding: using moulding press, by the way of vertically vertically suppressing, makes cylindrical soft magnet Core is integrally formed compacting.Briquetting pressure when cylindrical soft magnet core is integrally formed compacting is 6-12T/cm2, forming temperature is 60-200°。
Heat treatment: tenth step the soft magnet core of the 9th step compression moulding is heat-treated.The temperature of heat treatment is 120- 200 °, keep the temperature 4-6 hours.
Embodiment 3
A kind of automobile ignition coil soft magnet core, the shape of soft magnet core are cylindrical body；The component of soft magnet core and contain Amount, by weight percentage, comprising: Ni 4%；Ti 0.3%；Co 0.3%；P 0.4%；Sn 0.3%；V 0.3%；Phenolic resin 2%；Surplus is iron.Wherein, C≤0.02%, O≤0.15%.
Soft magnet core is prepared according to following technique:
Vacuum melting: the first step according to the proportion by iron block and nickel block, puts into and carries out melting casting in vaccum sensitive stove.
Second step just crushes: the alloy that first step melting casting is completed tentatively is crushed using pulverizer.
Middle crushing: the alloy crushed at the beginning of second step under nitrogen protection atmosphere, is first put into selection by winnowing sand mill by third step It is interior, according still further to proportion, Ti, Co, P, Sn and V are sequentially added, selection by winnowing sand mill is opened, is crushed in progress.
4th step, it is finely divided: under protected alcohol atmosphere, the alloy crushed in third step being carried out again using sand mill It is finely divided.
5th step takes off liquid, drying: using the centrifuge alloyed powder finely divided to the 4th step, carrying out de- liquid；Recycle baking oven Alloyed powder after de- liquid is dried.
Screening: 6th step is taken off the alloyed powder that liquid drying is completed to the 5th step and is sieved using vibrating screen.
7th step, annealing: under hydrogen nitrogen mixed gas atmosphere, by the 6th step screening complete alloyed powder use push away boat furnace into Row annealing.The temperature of annealing is 1200 °, keeps the temperature 2-4 hours.
Insulating wrapped: 8th step the alloyed powder that the processing of the 7th step annealing is completed is added in insulating wrapped agitator, then is pressed Phenolic resin and lubricant is added according to proportion, insulating wrapped agitator carries out heating stirring and cladding.Insulating wrapped agitator Heating temperature is 55-65 °, and preferably 60 °, insulating wrapped agitator includes interior bucket, outer barrel and the heating for being coated on outer barrel surrounding Device, interior bucket can rotation and as outer barrel revolves, so as to prevent alloyed powder from gluing wall, heating temperature is more equal It is even.After being covered to complete, when being lower than 40 °, the alloyed powder in insulating wrapped bucket can be taken out.Alloyed powder after insulating wrapped Grain distribution needs to meet: 100-200 mesh 10-20%, 200-300 mesh 40-50%, and surplus is the following particle of 300 mesh.
9th step, compression moulding: using moulding press, by the way of vertically vertically suppressing, makes cylindrical soft magnet Core is integrally formed compacting.Briquetting pressure when cylindrical soft magnet core is integrally formed compacting is 6-12T/cm2, forming temperature is 60-200°。
Heat treatment: tenth step the soft magnet core of the 9th step compression moulding is heat-treated.The temperature of heat treatment is 120- 200 °, keep the temperature 4-6 hours.
Verification experimental verification
By the automobile ignition coil soft magnet core of the application, by taking μ e60 as an example, using same LCR number secohmmeter, Density tester and power consumption instrument carry out the test of initial permeability, compact density, magnetic induction intensity in 100KHz.
Meanwhile using the prior art, such as silicon steel sheet in background technique, as reference examples.
Test result is as follows:
Initial permeability Compact density g/cm3 Than total power consumption Ps(W/kg)
Embodiment 1 6300 7.3 26.5
Embodiment 2 6800 7.5 25.1
Embodiment 3 6500 7.4 26.2
Reference examples 5600 —— 30
By testing above, it is seen that of the invention is with the obvious advantage, is convenient for wide popularization and application.
The preferred embodiment of the present invention has been described above in detail, still, during present invention is not limited to the embodiments described above Detail a variety of equivalents can be carried out to technical solution of the present invention within the scope of the technical concept of the present invention, this A little equivalents all belong to the scope of protection of the present invention.

Claims (1)

1. a kind of automobile ignition coil soft magnet core, the shape of soft magnet core is cylindrical body；It is characterized by: soft magnet core Component and content, by weight percentage, comprising:
Ni 2-4%；
Ti 0.2-0.3%；
Co 0.1-0.3%；
P 0.15-0.4%；
Sn 0.1-0.3%；
V 0.1-0.3%；
Phenolic resin 1-2%；
Surplus is iron；
Soft magnet core is prepared according to following technique:
Vacuum melting: the first step according to the proportion by iron block and nickel block, puts into and carries out melting casting in vaccum sensitive stove；
Second step just crushes: the alloy that first step melting casting is completed tentatively is crushed using pulverizer；
Third step, the alloy crushed at the beginning of second step: under nitrogen protection atmosphere, being first put into selection by winnowing sand mill by middle crushing, then According to the proportion, Ti, Co, P, Sn and V are sequentially added, selection by winnowing sand mill is opened, is crushed in progress；
4th step, it is finely divided: under protected alcohol atmosphere, the alloy crushed in third step being subjected to fine powder using sand mill again It is broken；
5th step takes off liquid, drying: using the centrifuge alloyed powder finely divided to the 4th step, carrying out de- liquid；Recycle baking oven that will take off Alloyed powder after liquid is dried；
Screening: 6th step is taken off the alloyed powder that liquid drying is completed to the 5th step and is sieved using vibrating screen；
Annealing: the alloyed powder use that the screening of 6th step is completed under hydrogen nitrogen mixed gas atmosphere, is pushed away boat furnace and moved back by the 7th step Fire processing；The temperature of annealing is 800-1200 DEG C, keeps the temperature 2-4 hours；
Insulating wrapped: 8th step the alloyed powder that the processing of the 7th step annealing is completed is added in insulating wrapped agitator, according still further to matching Than phenolic resin and lubricant is added, insulating wrapped agitator carries out heating stirring and cladding；The heating of insulating wrapped agitator Temperature is 55-65 DEG C, and insulating wrapped agitator includes interior bucket, outer barrel and the heating device for being coated on outer barrel surrounding, and interior bucket can Rotation, and can revolve with outer barrel；
9th step, compression moulding: using moulding press, by the way of vertically vertically suppressing, makes cylindrical soft magnet core one Body formed compacting；Briquetting pressure when cylindrical soft magnet core is integrally formed compacting is 6-12T/cm2, forming temperature 60- 200℃；
Heat treatment: tenth step the soft magnet core of the 9th step compression moulding is heat-treated；The temperature of heat treatment is 120-200 DEG C, keep the temperature 4-6 hours.
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CN108899193A (en) * 2018-09-03 2018-11-27 浙江辉波蕾汽车部件有限公司 A kind of soft magnet core and preparation method thereof for automobile ignition coil

Citations (2)

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