CN110098042A - A kind of manufacture craft of midget inductor - Google Patents
A kind of manufacture craft of midget inductor Download PDFInfo
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- CN110098042A CN110098042A CN201910216099.1A CN201910216099A CN110098042A CN 110098042 A CN110098042 A CN 110098042A CN 201910216099 A CN201910216099 A CN 201910216099A CN 110098042 A CN110098042 A CN 110098042A
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- 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
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- 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
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- 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
- H01F41/04—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 for manufacturing coils
-
- 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
- H01F41/04—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 for manufacturing coils
- H01F41/06—Coil winding
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- 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
- H01F41/04—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 for manufacturing coils
- H01F41/10—Connecting leads to windings
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- Power Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Manufacturing Cores, Coils, And Magnets (AREA)
Abstract
The invention discloses a kind of manufacture crafts of midget inductor, comprising the following steps: wire rod is turned to coil by coil winding；Polar curve arranges, and polar curve flattening is arranged；Cold moudling is compacted the magnetic powder that resin is smeared on surface to obtain the magnet for having relief portion in the coil whole body and gap by cold stamping die；Polar curve bending, by flat polar curve bending, is tightly attached to it on magnet outer wall；It is hot-forming, magnet is squeezed after resin is softened, makes magnet post forming；Magnet is placed in spraying pot body by surface treatment, is carried out rolling stirring thermal jet, is made the resin-coated layer in the surface of magnet；Polar curve appears, and removal two surface of polar curve and the resin layer near it reveal polar curve two and part magnet；External electrode production makes external electrode by the way of metal electrodeposition at the polar curve two and electrode surface appeared.The inductance stabilization that it makes is reliable, electromagnetic performance is excellent, long service life, is suitble to miniaturization inductance.
Description
Technical field
The present invention relates to the manufacture crafts of inductor, and in particular to a kind of manufacture craft of midget inductor.
Background technique
Inductor is one of common component in circuit.It is analyzed from the manufacture craft of inductor, is broadly divided into lamination
Formula, Wound-rotor type and integrated molding formula.It is wherein integrally formed the overall merit that formula inductor has laminated type and Wound-rotor type, i.e., well
Electromagnetic shielding performance and high power characteristics.
There are mainly two types of the manufacturing process of integrated molding formula inductor.One of which is then first coiling air core coil exists
Conductive electrode film is welded on the polar curve of coil, finally fills out magnetic powder disposal pressed moulding；Another is that first coiling is hollow
Then coil fills out magnetic powder disposal pressed moulding, finally draw polar curve from end face after molding and carry out five face dispatches from foreign news agency
Pole production.
But there is also some problems for the inductor of the formula of integrated molding: one is, in a compression moulding, inside is easy to produce
Raw crackle, coil are also easy to produce deformation, reduce the reliability that product uses；The second is external electrode uses the work of welding electrode piece
Skill, miniaturized products not easy to manufacture, and higher cost；The third is drawing polar curve using end face and carrying out five face electrode fabrications
Technique, it is smaller to space utilization rate, and the polar curve and external electrode contact area drawn are smaller, increase so as to cause contact resistance,
Its cost is also higher.
Summary of the invention
The technical problem to be solved in the present invention is to provide a kind of manufacture craft of midget inductor, the inductance stabilizations of production
Reliably, electromagnetic performance is excellent, long service life, is suitble to miniaturization inductance.
In order to solve the above-mentioned technical problems, the present invention provides a kind of manufacture crafts of midget inductor, including following step
It is rapid:
Wire rod is turned to coil, and polar curve is stretched out by S1, coil winding；
S2, polar curve arrange, and polar curve flattening is arranged, obtains flat polar curve, and its face is perpendicular to the central axis of coil；
The magnetic powder that resin is smeared on surface is compacted by cold stamping die in the coil whole body and gap by S3, cold moudling
Place obtains the magnet for having relief portion；
S4, polar curve bending, by flat polar curve bending, are tightly attached to it in magnet and flat polar curve implantation Bending Mould
On magnet outer wall；
It is S5, hot-forming, by the magnet implantation sectional dimension hot pressing die bigger than cold stamping die, squeezed after softening resin
The two place face of polar curve of magnet and its opposite face, make magnet post forming；
Magnet is placed in spraying pot body by S6, surface treatment, carries out rolling stirring thermal jet, the surface of magnet is made to coat tree
Rouge layer；
S7, polar curve appear, and removal two surface of polar curve and the resin layer near it manifest polar curve two and part magnet
Come, the magnet revealed is electrode surface；
S8, external electrode production make dispatch from foreign news agency by the way of metal electrodeposition at the polar curve two and electrode surface appeared
Pole.
Preferably, the hot pressing die includes push-down head three, die wall five and seaming chuck three；The die wall five is enclosed in
Three periphery of push-down head forms hot pressing die cavity；The seaming chuck three is slidably arranged at the upper opening of hot pressing die cavity；The die wall five
Sectional dimension it is 0.8 ± 0.2mm bigger than die wall one.
Preferably, the process of step S5 are as follows:
S50, magnet is implanted into hot pressing die cavity, the two place face of polar curve of magnet is located above；60S is preheated, hot-die is made
Intracavitary temperature reaches 170 ± 10 DEG C；
S51, seaming chuck three is pushed, flows magnetic powder；Then 100 ± 20S of pressure maintaining completes secondary hot pressing molding.
Preferably, the cold stamping die includes push-down head one, die wall one, die wall three and seaming chuck one；The pushing
First upper surface is provided with convex block, the equivalent width of width and flat polar curve close to one side；The die wall one is enclosed in down
Around pressure head one, Formation cross-section is the cold pressing die cavity of rectangle；Line chamber is offered on the die wall one, is located at convex block；It is described
Die wall two can slide into line chamber, for clamping flat polar curve；The seaming chuck one is located at the upper accent of cold pressing die cavity；It is described
Magnetic powder can be once suppressed into magnet by cold stamping die.
Preferably, the process of step S3 are as follows:
S30, coil is implanted into cold pressing die cavity, while flat polar curve is laid in line chamber；
S31, die wall two is slid into line chamber, and be pressed on flat polar curve, the fixation of flat polar curve is completed, at this time at coil
In vacant state；
S32, it is being cold-pressed mould filling magnetic powder, is being submerged in coil in magnetic powder completely；
S33, seaming chuck one is slid into cold pressing die cavity, is mutually drawn close in coil equidistant with constant speed, completes cold moudling,
Briquetting pressure is 200 ± 50MPa, can be drawn off after the completion of molding.
Preferably, the Bending Mould includes push-down head two, die wall three, die wall four, seaming chuck two and flexing roll；Institute
It states die wall three and is enclosed in two periphery of push-down head, form bending die cavity；The die wall four is separable to be arranged above die wall three；Institute
Seaming chuck two is stated to be arranged at the upper opening of bending die cavity；The side of die wall three is arranged in the flexing roll, and can be close to mould
The top of bending die cavity is rolled into above wall three.
Preferably, the process of step S4 are as follows:
S40, coil is transferred in bending die cavity, die wall three and die wall four are clamped on flat polar curve, then seaming chuck two
It pushes；
S41, after seaming chuck two contacts magnet, die wall four is detached from die wall three, and seaming chuck continues to push, until magnet is fallen in
On the upper surface of push-down head two, flat polar curve is folded upward at 90 ° at this time, and polar curve one is fallen into relief portion；
S42, push-down head two rise, and keep the upper surface of magnet concordant with the upper surface of die wall three；
S43, flexing roll are rolled in side where the upper surface of die wall three from flat polar curve to center, i.e., again by flat polar curve
90-degree bent, polar curve two are tightly attached to the surface of magnet.
Preferably, the process of step S6 is to provide a spraying pot body of the inside with auxiliary paddle；Magnet is revolved
Turn in spraying pot body, and makes to spray 45 ± 15 ° of pot body inclination；The intracorporal temperature of pot will be sprayed and be heated to 80 ± 20 DEG C；Rotation
Pot body is sprayed, revolving speed is 100 ± 20r/min, and rotates paddle；Resin is sprayed into spraying pot body, until resin layer
Thickness reaches 0.015 ± 0.005mm.
Preferably, the external electrode from-inner-to-outer successively includes layers of copper, nickel layer and tin layers, thickness is respectively
0.005 ± 0.002mm, 0.006 ± 0.002mm and 0.007 ± 0.002mm.
A kind of manufacture craft of midget inductor, which comprises the following steps:
Wire rod is wound on the magnetic core of preparatory compression moulding by S10, coil winding, obtains coil, and in subsequent step
In remain the relatively fixed of coil and magnetic core, two polar curves of the coil are protruding, the bending strength of the magnetic core
10 ± 2N need to be met；
S2, polar curve arrange, and polar curve flattening is arranged, obtains flat polar curve, and its face is perpendicular to the central axis of coil；
The magnetic powder that resin is smeared on surface is compacted by cold stamping die in the coil whole body and gap by S3, cold moudling
Place obtains the magnet for having relief portion；
S4, polar curve bending, by flat polar curve bending, are tightly attached to it in magnet and flat polar curve implantation Bending Mould
On magnet outer wall；
S5, magnet is implanted into the sectional dimension hot pressing die bigger than cold stamping die, softens the pole of extruding magnet after resin
Two place face of line and its opposite face, make magnet post forming；
Magnet is placed in spraying pot body by S6, surface treatment, carries out rolling stirring thermal jet, the surface of magnet is made to coat tree
Rouge layer；
S7, polar curve appear, and removal two surface of polar curve and the resin layer near it manifest polar curve two and part magnet
Come, the magnet revealed is electrode surface；
S8, external electrode production make dispatch from foreign news agency by the way of metal electrodeposition at the polar curve two and electrode surface appeared
Pole.
Compared with prior art, the beneficial effects of the present invention are:
1, the present invention reduces the deformation extent of coil using the moulding process twice for being first cold-pressed hot repressing, avoids interior
Portion is cracked, and inductor is made to have outstanding electromagnetic property and reliability, and anti-interference and electromagnetic wave shielding is more preferable；Meanwhile two
After secondary molding, magnet density is higher, and effective magnetic volume under same volume is bigger, so as to further decrease the body of inductor
Product, to meet higher close-off density on PCB.
2, the present invention increases the contact surface of internal electrode and external electrode using polar curve arrangement and polar curve bending technique
Product, effectively reduces the contact resistance between internal and external electrode.
3, the present invention is by adhering to resin layer in magnet surface, make inductor have it is outstanding anti-oxidant, anticorrosive and
Acidproof alkali ability.
4, the present invention substantially increases welding push-pull effort, reduces metal layer by using the technique of direct metal deposition
Between contact resistance；And minimize inductor.
Detailed description of the invention
It, below will be in embodiment technical description for the clearer technical solution illustrated in technology of the embodiment of the present invention
Required attached drawing is briefly described, it should be apparent that, the accompanying drawings in the following description is only some realities of the invention
Example is applied, for those of ordinary skill in the art, without creative efforts, additionally it is possible to according to these attached drawings
Obtain other attached drawings.
Fig. 1 is the fabrication processing schematic diagram of midget inductor of the present invention；
Fig. 2 is the flow diagram of step S3；
Fig. 3 is the flow diagram of step S4；
Fig. 4 is the flow diagram of step S5；
Fig. 5 is the flow diagram of step S10；
Fig. 6 is the flow diagram of step S20.
Wherein, 10- coil, 11- polar curve, the flat polar curve of 11a-, 11b- polar curve one, 11c- polar curve two, 12- magnet, 12a-
Relief portion, 12b- clad, 12c- electrode surface, 12d- magnetic powder, 13- resin layer, 14- external electrode, 15- magnetic core；
30- push-down head one, 31- convex block, 32- die wall one, 33- line chamber, 34- die wall two, 35- seaming chuck one；
40- push-down head two, 41- die wall three, 42- die wall four, 43- seaming chuck two, 44- flexing roll；
50- push-down head three, 51- die wall five, 52- seaming chuck three.
Specific embodiment
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Whole description, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.It is based on
Embodiment during this is practical, those of ordinary skill in the art are obtained all without creative labor
Other embodiments shall fall within the protection scope of the present invention.
Embodiment one
Shown in referring to Fig.1, present embodiment discloses a kind of manufacture crafts of midget inductor, comprising the following steps:
S1, coil winding
Wire rod is turned into coil 10.Two polar curves 11 of coil 10 are protruding.The wire rod of coil 10 includes but unlimited
In round wires and flat wire.
S2, polar curve arrange
Polar curve 11 is subjected to flattening arrangement, obtains flat polar curve 11a.The face of flat polar curve 11a is perpendicular to coil 10
Central axis.
Referring to Fig.1 and shown in Fig. 6, the method that above-mentioned flattening arranges arranges and flat wire including the flattening for round wires
S20 is arranged as being rotated by 90 ° for axis to stretch out direction.When wire rod be other shapes when, can carry out flattening arrangement, be rotated by 90 ° it is whole
S20 or other method for sorting are managed, to obtain flat polar curve 11a.The flat polar curve 11a obtained after the arrangement of polar curve 11, can
The contact area for greatly increasing itself and external electrode 14, reduces contact resistance, improves the electric property of product.
S3, cold moudling
The magnetic powder 12d that resin is smeared on surface is compacted obtain in 10 whole body of coil and gap by cold stamping die
Magnet 12 with relief portion 12a.
Specifically, above-mentioned magnet 12 is hexahedron.Flat polar curve 11a is pierced by magnet 12 by a face of magnet 12.Evacuation
Where flat polar curve 11a is arranged in portion 12a on the face of the magnet 12 of side.Relief portion 12a is located at the side of flat polar curve 11a, and
Its thickness is less than other side.Relief portion 12a can accommodate one 11b of polar curve obtained after flat polar curve 11a bending.Resin can
Play the role of bonding.
As further improvement of this embodiment, above-mentioned magnetic powder 12d is iron, carbonyl, alloy, amorphous nano material system
Powder made of work.
Referring to shown in Fig. 2, as further improvement of this embodiment, above-mentioned cold stamping die includes push-down head 1, die wall
One 32, die wall 3 34 and seaming chuck 1.The upper surface of push-down head 1 is provided with convex block 31 close to one side.The width of convex block 31
With the equivalent width of flat polar curve 11a.Die wall 1 is enclosed in around push-down head 1, and Formation cross-section is the cold stamping die of rectangle
Chamber.Line chamber 33 is provided on die wall 1, and is located at convex block 31.Above-mentioned die wall 2 34 can slide into line chamber 33, for pressing from both sides
Hold flat polar curve 11a.Seaming chuck 1 is located at the upper accent of cold pressing die cavity.Cold stamping die can be primary by magnetic powder 11d
It is suppressed into magnet 12, structure is simple, and shaping speed is fast；When convex block 31 is used for cold moudling, magnetic powder 12d is pushed aside, from
And relief portion 12a is formed on magnet 12.
As further improvement of this embodiment, above-mentioned steps S3 includes the following steps S30~S33:
S30, coil 10 is implanted into cold pressing die cavity, while flat polar curve 11a is laid in line chamber 33.
S31, die wall 2 34 is slid into line chamber 33, and is pressed on flat polar curve 11a, complete the fixation of flat polar curve 11a,
Coil 10 is in vacant state at this time.
S32, it is being cold-pressed mould filling magnetic powder 12d, is being submerged in coil 10 completely in magnetic powder 12d.
S33, seaming chuck 1 is slid into cold pressing die cavity, is mutually drawn close in 10 equidistant of coil with constant speed, completes cold pressing
Molding, briquetting pressure are 200 ± 50MPa.It can be drawn off after the completion of molding.
S4, polar curve bending
By in magnet 12 and flat polar curve 11a implantation Bending Mould, by flat polar curve 11a bending, it is made to be tightly attached to magnet
On 12 outer walls.
Specifically, above-mentioned flat polar curve 11a forms one 11b of polar curve and two 11c of polar curve in bending.One 11b of polar curve receiving
In relief portion 12a.Two 11c of polar curve is tightly attached to the surface of the magnet 12 adjacent with relief portion 12a.
Referring to shown in Fig. 3, as further improvement of this embodiment, above-mentioned Bending Mould includes push-down head 2 40, die wall
3 41, die wall 4 42, seaming chuck 2 43 and flexing roll 44.Die wall 3 41 is enclosed in 2 40 periphery of push-down head, forms bending die cavity.
Die wall 4 42 is separable to be arranged above die wall 3 41.Seaming chuck 2 43 is arranged at the upper opening of bending die cavity.Flexing roll
44 are arranged in the side of die wall 3 41, and the top of bending die cavity can be rolled into close to 3 41 top of die wall.
As further improvement of this embodiment, above-mentioned steps S4 includes the following steps S40~S43:
S40, coil 10 is transferred in bending die cavity, die wall 3 41 and die wall 4 42 are clamped on flat polar curve 11a, then
Seaming chuck 2 43 pushes.
S41, after seaming chuck 2 43 contacts magnet 12, die wall 4 42 is detached from die wall 3 41, and seaming chuck 43 continues to push, directly
It is fallen in magnet 12 on the upper surface of push-down head 2 40, flat polar curve 11a is folded upward at 90 ° at this time, and one 11b of polar curve, which is fallen into, to be kept away
It allows in portion 12a.
S42, push-down head 2 40 rise, and keep the upper surface of magnet 12 concordant with the upper surface of die wall 3 41.
S43, flexing roll 44 are rolled in side where the upper surface of die wall 3 41 from flat polar curve 11a to center, i.e., will be flat
90-degree bent, two 11c of polar curve are tightly attached to the surface of magnet 12 to polar curve 11a again.
The above improved plan, bending speed is fast, and will not damage polar curve 11.
It is S5, hot-forming
Magnet 12 is implanted into the sectional dimension hot pressing die bigger than cold stamping die, softens resin at high temperature, and squeeze
Face and its opposite face where two 11c of polar curve of magnet 12, make 12 post forming of magnet.
Specifically, the hot pressing temperature of above-mentioned hot pressing die is 170 ± 10 DEG C, the dwell time is 100 ± 20S.It is hot-forming
Afterwards, the fine and close program of magnet 12 increases, and has effectively eliminated the underbead crack of magnet 12；And since magnetic powder 12d has stream
Dynamic property, can not only flow to one surface 11b of polar curve, form clad 12b, it is made to obtain preferably protection, also can be more
Go deep into gap, keep 12 global density of magnet uniform, Crack prevention occurs.
Referring to shown in Fig. 4, as further improvement of this embodiment, above-mentioned hot pressing die includes push-down head 3 50, die wall
5 51 and seaming chuck 3 52.Die wall 5 51 is enclosed in 3 50 periphery of push-down head, forms hot pressing die cavity.The sliding setting of seaming chuck 3 52
At the upper opening of hot pressing die cavity.The sectional dimension of die wall 5 51 is 0.8 ± 0.2mm bigger than die wall 1.To save processing step,
Production efficiency is improved, above-mentioned hot pressing die can be a part of bending mold, i.e., hot-forming directly by push-down head 2 40, mould
Wall 3 41 and seaming chuck 2 43 are completed.
As further improvement of this embodiment, above-mentioned steps S5 includes the following steps S50~S51:
S50, magnet 12 is implanted into hot pressing die cavity, face where two 11c of polar curve of magnet 12 is located above；60S is preheated, is made
The intracavitary temperature of hot-die reaches 170 ± 10 DEG C.
S51, seaming chuck 3 52 is pushed, flows magnetic powder 12d；Then 100 ± 20S of pressure maintaining, complete secondary hot pressing at
Type.
S6, surface treatment
Magnet 12 is placed in spraying pot body, rolling stirring thermal jet is carried out, makes the resin-coated layer 13 in the surface of magnet 12.
Specifically, providing a spraying pot body of the inside with auxiliary paddle；Magnet 12 is rotated in spraying pot body, and
Make to spray 45 ± 15 ° of pot body inclination；The intracorporal temperature of pot will be sprayed and be heated to 80 ± 20 DEG C；Rotary spraying pot body, revolving speed 100
± 20r/min, and rotate paddle；Spray resin into spraying pot body, until the thickness of resin layer 13 reach 0.015 ±
0.005mm.Resin layer 13 is that magnet 12 provides one layer of uniform corrosion-resistant oxidation resistant protective layer, obtains magnet 12 absolutely
Edge, anti-wear, antirust effect, greatly improve the reliability of product.Resin can be epoxy resin.
S7, polar curve appear
Two surface 11c of polar curve and the resin layer 13 near it are removed by the way of radium-shine, cutting or polishing, makes polar curve two
11c and part magnet 12 reveal, and the magnet 12 revealed is electrode surface 12c.Electrode surface 12c is capable of increasing external electrode
14 area improves the efficiency and success rate of attachment.
S8, external electrode production
By the way of metal electrodeposition, external electrode 14 is made at polar curve two 11c and electrode surface 12c appeared.
Specifically, above-mentioned 14 from-inner-to-outer of external electrode successively includes layers of copper, nickel layer and tin layers, thickness is respectively 0.005
± 0.002mm, 0.006 ± 0.002mm and 0.007 ± 0.002mm.External electrode 14 can weld and be connected external electrode, and lead
Electrical and push-pull effort characteristic good.
Embodiment two
Referring to Figure 5, present embodiment discloses the manufacture crafts of another midget inductor, with embodiment one
It the difference is that only the difference of the step S1 in embodiment one.
In the present embodiment, comprising the following steps:
S10, coiling
Wire rod is wound on the magnetic core 15 of preparatory compression moulding, coil 10 is obtained.Two polar curves 11 of coil 10 are outside
It stretches out.The wire rod of coil 10 includes but is not limited to round wires and flat wire.During carrying out subsequent each step, coil 10 and magnetic core
15 is relatively fixed.The coiling on the magnetic core 15 suppressed in advance, can further promote magnetic density, to improve effective magnetic conductance
Rate obtains higher properties of product.
As the further improvement of this example, the bending strength of above-mentioned magnetic core 15 need to meet 10 ± 2N, with guarantee steadily around
Line.
The foregoing description of the disclosed embodiments enables those skilled in the art to implement or use the present invention.
Various modifications to these embodiments will be readily apparent to those skilled in the art, as defined herein
General Principle can be realized in other embodiments without departing from the spirit or scope of the present invention.Therefore, of the invention
It is not intended to be limited to the embodiments shown herein, and is to fit to consistent with principles disclosed herein and novel point
Widest scope.
Claims (10)
1. a kind of manufacture craft of midget inductor, which comprises the following steps:
Wire rod is turned to coil, and polar curve is stretched out by S1, coil winding；
S2, polar curve arrange, and polar curve flattening is arranged, obtains flat polar curve, and its face is perpendicular to the central axis of coil；
The magnetic powder that resin is smeared on surface is compacted obtain in the coil whole body and gap by S3, cold moudling by cold stamping die
Obtain the magnet with relief portion；
S4, polar curve bending, by flat polar curve bending, make it be tightly attached to magnet in magnet and flat polar curve implantation Bending Mould
On outer wall；
It is S5, hot-forming, by the magnet implantation sectional dimension hot pressing die bigger than cold stamping die, magnet is squeezed after softening resin
Two place face of polar curve and its opposite face, make magnet post forming；
Magnet is placed in spraying pot body by S6, surface treatment, is carried out rolling stirring thermal jet, is made the resin-coated layer in the surface of magnet；
S7, polar curve appear, and removal two surface of polar curve and the resin layer near it reveal polar curve two and part magnet, show
The magnet exposed is electrode surface；
S8, external electrode production make external electrode by the way of metal electrodeposition at the polar curve two and electrode surface appeared.
2. the manufacture craft of midget inductor as described in claim 1, which is characterized in that the hot pressing die includes push-down head
Three, die wall five and seaming chuck three；The die wall five is enclosed in three periphery of push-down head, forms hot pressing die cavity；The seaming chuck three is sliding
It is dynamic to be arranged at the upper opening of hot pressing die cavity；The sectional dimension of the die wall five is 0.8 ± 0.2mm bigger than die wall one.
3. the manufacture craft of midget inductor as claimed in claim 2, which is characterized in that the process of step S5 are as follows:
S50, magnet is implanted into hot pressing die cavity, the two place face of polar curve of magnet is located above；60S is preheated, keeps hot-die intracavitary
Temperature reach 170 ± 10 DEG C；
S51, seaming chuck three is pushed, flows magnetic powder；Then 100 ± 20S of pressure maintaining completes secondary hot pressing molding.
4. the manufacture craft of midget inductor as described in claim 1, which is characterized in that the cold stamping die includes push-down head
One, die wall one, die wall three and seaming chuck one；The upper surface of the push-down head one is provided with convex block close to one side, width and flat
The equivalent width of mean pole line；The die wall one is enclosed in around push-down head one, and Formation cross-section is the cold pressing die cavity of rectangle；The mould
Line chamber is offered on wall one, is located at convex block；The die wall two can slide into line chamber, for clamping flat polar curve；It is described
Seaming chuck one is located at the upper accent of cold pressing die cavity；Magnetic powder can be once suppressed into magnet by the cold stamping die.
5. the manufacture craft of midget inductor as claimed in claim 4, which is characterized in that the process of step S3 are as follows:
S30, coil is implanted into cold pressing die cavity, while flat polar curve is laid in line chamber；
S31, die wall two is slid into line chamber, and be pressed on flat polar curve, complete the fixation of flat polar curve, coil is in outstanding at this time
Dummy status；
S32, it is being cold-pressed mould filling magnetic powder, is being submerged in coil in magnetic powder completely；
S33, seaming chuck one is slid into cold pressing die cavity, is mutually drawn close in coil equidistant with constant speed, complete cold moudling, molding
Pressure is 200 ± 50MPa, can be drawn off after the completion of molding.
6. the manufacture craft of midget inductor as described in claim 1, which is characterized in that the Bending Mould includes push-down head
Two, die wall three, die wall four, seaming chuck two and flexing roll；The die wall three is enclosed in two periphery of push-down head, forms bending die cavity；
The die wall four is separable to be arranged above die wall three；The seaming chuck two is arranged at the upper opening of bending die cavity；It is described
Flexing roll is arranged in the side of die wall three, and can be close to the top for being rolled into bending die cavity above die wall three.
7. the manufacture craft of midget inductor as claimed in claim 6, which is characterized in that the process of step S4 are as follows:
S40, coil is transferred in bending die cavity, die wall three and die wall four are clamped on flat polar curve, and then seaming chuck two pushes；
S41, after seaming chuck two contacts magnet, die wall four is detached from die wall three, and seaming chuck continues to push, until magnet falls in pushing
On first two upper surface, flat polar curve is folded upward at 90 ° at this time, and polar curve one is fallen into relief portion；
S42, push-down head two rise, and keep the upper surface of magnet concordant with the upper surface of die wall three；
S43, flexing roll are rolled in side where the upper surface of die wall three from flat polar curve to center, i.e., bend flat polar curve again
90 °, polar curve two is tightly attached to the surface of magnet.
8. the manufacture craft of midget inductor as described in claim 1, which is characterized in that the process of step S6 is to provide in one
Spraying pot body of the portion with auxiliary paddle；Magnet is rotated in spraying pot body, and makes to spray 45 ± 15 ° of pot body inclination；It will
The spraying intracorporal temperature of pot is heated to 80 ± 20 DEG C；Rotary spraying pot body, revolving speed is 100 ± 20r/min, and turns paddle
It is dynamic；Resin is sprayed into spraying pot body, until the thickness of resin layer reaches 0.015 ± 0.005mm.
9. the manufacture craft of midget inductor as described in claim 1, which is characterized in that the external electrode from-inner-to-outer is successively
Including layers of copper, nickel layer and tin layers, thickness be respectively 0.005 ± 0.002mm, 0.006 ± 0.002mm and 0.007 ±
0.002mm。
10. a kind of manufacture craft of midget inductor, which comprises the following steps:
Wire rod is wound on the magnetic core of preparatory compression moulding by S10, coil winding, obtains coil, and begin in subsequent steps
Whole hold-in winding and magnetic core it is relatively fixed, two polar curves of the coil are protruding, and the bending strength of the magnetic core need to expire
10 ± 2N of foot；
S2, polar curve arrange, and polar curve flattening is arranged, obtains flat polar curve, and its face is perpendicular to the central axis of coil；
The magnetic powder that resin is smeared on surface is compacted obtain in the coil whole body and gap by S3, cold moudling by cold stamping die
Obtain the magnet with relief portion；
S4, polar curve bending, by flat polar curve bending, make it be tightly attached to magnet in magnet and flat polar curve implantation Bending Mould
On outer wall；
S5, magnet is implanted into the sectional dimension hot pressing die bigger than cold stamping die, softens the polar curve two of extruding magnet after resin
Place face and its opposite face make magnet post forming；
Magnet is placed in spraying pot body by S6, surface treatment, is carried out rolling stirring thermal jet, is made the resin-coated layer in the surface of magnet；
S7, polar curve appear, and removal two surface of polar curve and the resin layer near it reveal polar curve two and part magnet, show
The magnet exposed is electrode surface；
S8, external electrode production make external electrode by the way of metal electrodeposition at the polar curve two and electrode surface appeared.
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| CN110565134A (en) * | 2019-10-09 | 2019-12-13 | 深圳华络电子有限公司 | method for preparing electrode of inductance device |
| CN111354535A (en) * | 2020-04-22 | 2020-06-30 | 昆山玛冀电子有限公司 | Inductor, electronic device and preparation method thereof |
| CN113345705A (en) * | 2021-05-31 | 2021-09-03 | 昆山欣佑立自动化有限公司 | Manufacturing process of inductance element with high manufacturing efficiency |
| CN113380513A (en) * | 2021-06-21 | 2021-09-10 | 深圳市铂科新材料股份有限公司 | Integrated multilayer coil inductor and preparation method thereof |
| CN113724987A (en) * | 2021-08-26 | 2021-11-30 | 横店集团东磁股份有限公司 | Inductor manufacturing method and inductor |
| WO2022165992A1 (en) * | 2020-10-19 | 2022-08-11 | 湖南创一电子科技股份有限公司 | Preparation method for metal powder core integrated chip inductor |
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