CN113793749A - Inductor manufacturing method - Google Patents
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- CN113793749A CN113793749A CN202111066881.3A CN202111066881A CN113793749A CN 113793749 A CN113793749 A CN 113793749A CN 202111066881 A CN202111066881 A CN 202111066881A CN 113793749 A CN113793749 A CN 113793749A
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- 238000004519 manufacturing process Methods 0.000 title claims abstract description 41
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical group [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 85
- 238000003466 welding Methods 0.000 claims abstract description 28
- 238000000034 method Methods 0.000 claims abstract description 26
- 229910045601 alloy Inorganic materials 0.000 claims abstract description 25
- 239000000956 alloy Substances 0.000 claims abstract description 25
- 239000000843 powder Substances 0.000 claims abstract description 16
- 238000004804 winding Methods 0.000 claims abstract description 16
- 238000004806 packaging method and process Methods 0.000 claims abstract description 13
- 239000003292 glue Substances 0.000 claims description 18
- 238000001746 injection moulding Methods 0.000 claims description 17
- 230000007704 transition Effects 0.000 claims description 14
- 238000005520 cutting process Methods 0.000 claims description 11
- 239000000243 solution Substances 0.000 claims description 9
- 238000005245 sintering Methods 0.000 claims description 7
- 229920006351 engineering plastic Polymers 0.000 claims description 5
- 239000002245 particle Substances 0.000 claims description 5
- 239000002994 raw material Substances 0.000 claims description 5
- 239000000523 sample Substances 0.000 claims description 5
- 230000007246 mechanism Effects 0.000 claims description 4
- 239000011812 mixed powder Substances 0.000 claims description 4
- 238000005496 tempering Methods 0.000 claims description 4
- 238000003825 pressing Methods 0.000 claims description 3
- 238000000465 moulding Methods 0.000 claims description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 abstract description 5
- 229910052802 copper Inorganic materials 0.000 abstract description 4
- 239000010949 copper Substances 0.000 abstract description 4
- 230000020169 heat generation Effects 0.000 abstract description 2
- 239000000463 material Substances 0.000 description 8
- 230000000694 effects Effects 0.000 description 4
- 238000002161 passivation Methods 0.000 description 4
- 238000005538 encapsulation Methods 0.000 description 3
- 238000010438 heat treatment Methods 0.000 description 3
- RSWGJHLUYNHPMX-UHFFFAOYSA-N Abietic-Saeure Natural products C12CCC(C(C)C)=CC2=CCC2C1(C)CCCC2(C)C(O)=O RSWGJHLUYNHPMX-UHFFFAOYSA-N 0.000 description 2
- KHPCPRHQVVSZAH-HUOMCSJISA-N Rosin Natural products O(C/C=C/c1ccccc1)[C@H]1[C@H](O)[C@@H](O)[C@@H](O)[C@@H](CO)O1 KHPCPRHQVVSZAH-HUOMCSJISA-N 0.000 description 2
- 239000000853 adhesive Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000002844 melting Methods 0.000 description 2
- 230000008018 melting Effects 0.000 description 2
- 230000003647 oxidation Effects 0.000 description 2
- 238000007254 oxidation reaction Methods 0.000 description 2
- 229910000679 solder Inorganic materials 0.000 description 2
- KHPCPRHQVVSZAH-UHFFFAOYSA-N trans-cinnamyl beta-D-glucopyranoside Natural products OC1C(O)C(O)C(CO)OC1OCC=CC1=CC=CC=C1 KHPCPRHQVVSZAH-UHFFFAOYSA-N 0.000 description 2
- 239000002253 acid Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 229920001971 elastomer Polymers 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000004519 grease Substances 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000003754 machining Methods 0.000 description 1
- 239000012778 molding material Substances 0.000 description 1
- 238000005554 pickling Methods 0.000 description 1
- 229920002635 polyurethane Polymers 0.000 description 1
- 239000004814 polyurethane Substances 0.000 description 1
- 238000003672 processing method Methods 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 239000000565 sealant Substances 0.000 description 1
- 230000001629 suppression Effects 0.000 description 1
- 229910000859 α-Fe Inorganic materials 0.000 description 1
Images
Classifications
-
- 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
-
- 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
-
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Manufacturing Cores, Coils, And Magnets (AREA)
- Coils Or Transformers For Communication (AREA)
Abstract
The invention discloses a method for manufacturing an inductor, which comprises the steps of manufacturing an iron core by alloy powder, fixing the iron core on a lead frame, winding a conductive flat wire on the iron core, welding a leading-out end of the conductive flat wire on the lead frame by laser spot welding, and packaging the iron core on the lead frame. The inductor manufactured by the inductor manufacturing method can reduce copper loss and magnetic loss, reduce loss and heat generation of products under high-frequency use, and can meet the requirements of high-frequency use environments.
Description
Technical Field
The invention relates to a processing method of an electrical element, in particular to a manufacturing method of an inductor.
Background
At present, many manufacturers use an injection-type inductor structure as a winding body, and the winding body is coated with powder, wherein the winding body uses a prototype enameled copper wire to perform coil winding, the powder is formed at the periphery in a high-pressure forming mode or a pouring sealant mode, and the glue is thermally cured by a baking process (the baking peak temperature is 140-. The injection type inductor produced by the method is generally applied to a circuit with a low frequency requirement of 100KHz, but with the advance of a 5G technology, a power circuit and a signal processing unit module need an inductor with higher frequency, the frequency is generally 500Khz or above, the loss of the inductor, such as magnetic loss, copper loss, eddy current loss and the like, is increased along with the increase of the frequency, and the inductor product has the obvious problem of heating.
Disclosure of Invention
The invention aims to provide an inductor manufacturing method, and the inductor manufactured by the inductor manufacturing method can reduce copper loss and magnetic loss, reduce loss and heat generation of a product under high-frequency use and meet the requirements of a high-frequency use environment.
In order to achieve the technical effects, the technical scheme of the invention is as follows:
the invention discloses an inductor manufacturing method, which comprises the following steps:
iron core made of alloy powder
Fixing the iron core on a lead frame;
winding a conductive flat wire on the iron core;
welding the leading-out end of the conductive flat wire on the lead frame by adopting laser spot welding;
and packaging the iron core on the lead frame.
In some embodiments, the manufacturing process of the iron core includes:
pressing and molding alloy powder to produce a blank;
cutting the blank into an I-shaped transitional blank body;
sintering the transition blank;
passivating the sintered transition green body to produce an iron core.
In some specific embodiments, the alloy powder is alloy iron powder, and the temperature for sintering the transition blank is 600-890 ℃.
In some embodiments, the iron core is bonded to the lead frame.
In some specific embodiments, the step of bonding the core comprises:
dripping glue solution on the lead frame by adopting a probe head;
absorbing the iron core by using a vacuum suction nozzle;
driving the vacuum suction nozzle to move so that the iron core is pressed on the glue solution;
and baking the lead frame.
In some more specific embodiments, the lead frame is baked using a tunnel oven and is positioned using a pinwheel when the lead frame moves relative to the tunnel oven.
In some embodiments, the step of packaging the core on the lead frame is as follows:
preheating a mold and then placing the iron core into the mold;
forming a packaging part by injection molding to package the iron core on the lead frame;
cutting the packaged finished product to enable the lead frame to be flush with the outer edge of the packaging part;
and tempering the cut finished product.
In some optional embodiments, the injection molding raw material is a mixed powder of engineering plastic particles and alloy iron powder, and the mass ratio of the alloy iron powder is 70-80%.
In some embodiments, the laser spot welding has a spot welding energy of 22J to 26J, a spot welding time of 8ms to 12ms, and a spot welding spot size of 0.05mm to 0.1 mm.
In some embodiments, the conductive flat wire is wound on the iron core by using a single-shaft winding mechanism, and the inlet end and the outlet end of the conductive flat wire are both provided with positioning pins for positioning the conductive flat wire.
The inductor manufacturing method has the beneficial effects that: the iron core is made of alloy powder, so that hysteresis loss can be reduced, the resonance frequency is improved, and the conducting wire wound on the iron core is a conducting flat wire, so that copper loss and magnetic loss can be reduced, and loss and heating of the inductor under high-frequency use are reduced; the adoption radium-shine spot welding realizes the welding of electrically conductive flat wire and lead frame and can increase spot welding precision and solder joint melting tension, avoids appearing the rosin joint problem, promotes the manufacturing yield of inductance.
Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.
Drawings
Fig. 1 is a flow chart of a method of manufacturing an inductor according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of an inductor manufacturing process according to an embodiment of the present invention;
fig. 3 is a flow chart of manufacturing a cell according to an embodiment of the present invention;
fig. 4 is a flowchart illustrating a process of fixing a cell to a lead frame according to an embodiment of the present invention;
fig. 5 is a flowchart of packaging a cell according to an embodiment of the present invention.
Reference numerals:
1. an iron core; 2. a lead frame; 3. a conductive flat wire; 4. and a packaging part.
Detailed Description
In order to make the technical problems solved, the technical solutions adopted and the technical effects achieved by the present invention clearer, the technical solutions of the present invention are further described below by way of specific embodiments with reference to the accompanying drawings.
In the description of the present invention, it is to be understood that the terms "central," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the invention and to simplify the description, and are not intended to indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and are not to be considered limiting of the invention.
Furthermore, features defined as "first" and "second" may explicitly or implicitly include one or more of the features for distinguishing between descriptive features, non-sequential, non-trivial and non-trivial. In the description of the present invention, "a plurality" means two or more unless otherwise specified.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
A specific flow of an inductor manufacturing method according to an embodiment of the present invention is described below with reference to fig. 1 to 5.
The method for manufacturing the inductor comprises the following steps:
s1: manufacturing an iron core 1 by using alloy powder;
specifically, the process of manufacturing the iron core 1 is as follows:
s11: the alloy powder is pressed and formed to produce the blank, namely the alloy powder is put into a pressing die and pressed and formed under high pressure, and the produced blank with the structure not only has good strength, but also has better electrical property. In actual operation, the alloy powder is made of alloy iron powder, the high-frequency characteristic of the alloy iron powder is good, and the high-frequency performance of the produced blank can be improved by using the alloy iron powder to manufacture the produced blank.
S12: the raw blank is cut into an i-shaped transition blank, i.e. the produced raw blank is placed on a machining device for cutting, for the convenience of winding, the transition blank is generally i-shaped, in this embodiment, the length, width and height of the i-shaped transition blank may be 2mm x 1.2mm (0.8mm-12.mm), 2mm x 1.6mm (0.8mm-1.2mm), 2.5mm x 2mm (0.8mm-1.2mm) or 3mm x 3mm (0.8mm-1.2 mm). Of course, in other embodiments of the present invention, the size and shape of the transitional blank may be selected according to actual needs, and the above description is only illustrative and not a complete limitation on the shape of the transitional blank.
S13: sintering the transition blank body, and baking the cut transition blank body at a low temperature, wherein the baking temperature is generally 600-890 ℃, generally speaking, the SRF (resonance Frequency) characteristic of the traditional ferrite is in the range of 90MHz-100MHz, and the SRF characteristic of the iron core 1 produced by sintering the alloy powder at a low temperature can be increased by 20-40%, that is, the iron core 1 produced by the method of the embodiment has a higher resonance Frequency, so that the iron core 1 produced by the method of the embodiment has a better high-Frequency characteristic.
Of course, it should be noted that in other embodiments of the present invention, the type of the alloy powder and the sintering temperature may be determined according to actual needs, and the above description is only exemplary and not completely limiting.
S14: the sintered transition blank is passivated to generate the iron core 1, the probability of oxidation of the transition blank can be reduced by passivating the transition blank, and the oxidation resistance of the iron core 1 manufactured by the method of the embodiment is improved, so that the service life of the inductor manufactured by the method of the embodiment is prolonged. It should be added that the passivation method of this embodiment may be natural passivation or acid pickling passivation, and the specific passivation method may be selected according to actual needs.
S2: fixing the iron core 1 on the lead frame 2;
specifically, the iron core 1 is fixed on the lead frame 2 in an adhesive manner, so that the connection between the iron core 1 and the lead frame 2 can be ensured, the installation manner of the iron core 1 and the lead frame 2 can be simplified, and the manufacturing efficiency of the inductor is improved.
The step of bonding the iron core 1 includes:
s21: the probe is adopted to drop the glue on the lead frame 2, the probe with the diameter of 0.3mm can be adopted to take out the glue from the glue box bearing the glue and then drop the glue on the lead frame 2, thus the volume of the glue on the lead frame 2 can be well controlled, the phenomenon that the iron core 1 cannot be stably bonded due to the too small volume of the glue can be avoided, and the phenomenon that impurities are stained on the iron core 1 due to the too large volume of the glue can be avoided. It should be additionally noted that, in the actual operation process, the type of the probe head and the glue solution can be selected according to actual needs.
S22: the iron core 1 is adsorbed by a vacuum suction nozzle, which can be a rubber suction nozzle with the aperture of 1mm and the vacuum negative pressure of-0.05 MPa5 to-0.5 MPa 5. The iron core 1 is conveyed by the vacuum suction nozzle, so that sundries are prevented from being stained on the iron core 1 in the process of moving the iron core 1, particularly, sundries such as human body grease and the like are prevented from being stained, the cleanness degree of the surface of the iron core 1 is ensured, and the electrical performance of the iron core 1 is ensured.
S23: the motion of drive vacuum suction nozzle makes iron core 1 suppression on the glue solution, can adopt cylinder cooperation stop screw to carry out accurate location material loading for iron core 1 can move the position at glue solution place stably and accurately, thereby ensures iron core 1 and lead frame 2's bonding effect.
Of course, in other embodiments of the present invention, the structure for driving the iron core 1 to move to the lead frame 2 is not limited to the structure of the vacuum suction nozzle and the air cylinder, and may be other conveying mechanisms such as a robot, and the form of the conveyed iron core 1 may be selected according to actual needs.
S24: toast the lead frame 2, can adopt the tunnel oven to toast 30min under 170 ℃, can further promote the connection stability of iron core 1 and lead frame 2 like this to can make the glue solution solidify with higher speed, promote the efficiency of bonding iron core 1. Preferably, adopt the pinwheel location when the lead frame 2 moves relative to the tunnel oven, can avoid the lead frame 2 to take place crooked in the motion process like this, avoid the lead frame 2 to collide the phenomenon emergence that leads to the bonding of lead frame 2 and iron core 1 to lose efficacy with the inside wall of tunnel oven.
It should be noted that, the connection structure between the core 1 and the lead frame 2 is not limited to bonding, and other connection methods may also be adopted, for example, connection structures such as connectors or buckles are adopted for connection, and the connection structure between the core 1 and the lead frame 2 may be selected according to actual needs.
S3: the flat conductive wire 3 is wound on the iron core 1, specifically, the flat conductive wire 3 can be wound on the iron core 1 by adopting a single-shaft winding mechanism, and the wire inlet end and the wire outlet end of the flat conductive wire 3 are both provided with positioning pins for positioning the flat conductive wire 3. In the winding process, the positioning pins are arranged at the wire inlet end and the wire outlet end of the flat conductive wire 3, so that the phenomenon that the flat conductive wire 3 deviates from the iron core 1 in the winding process can be avoided, the winding precision is ensured, the phenomenon that the lead-out wire of the flat conductive wire 3 is inclined to cause the deviation of a follow-up spot welding piece is avoided, and the production reject ratio of the inductor is reduced. The conductive flat wire 3 is used as a conducting wire wound on the iron core 1, so that the utilization rate of a winding space is increased, and the direct current resistance of winding is reduced. Alternatively, the conductive flat wire 3 is a weldable polyurethane self-adhesive flat wire with a resistance temperature of 220 ℃.
S4: adopt radium-shine spot welding with the end welding of drawing forth of electrically conductive flat wire 3 at lead frame 2, adopt radium-shine spot welding's mode to realize the welding of the end of drawing forth of electrically conductive flat wire 3 and lead frame 2, can increase spot welding precision and solder joint melting tension, avoid appearing the rosin joint problem to the production yield of inductance has been promoted.
Optionally, the spot welding energy of the laser spot welding is 22J-26J, the spot welding time is 8ms-12ms, and the spot welding spot size is 0.05mm-0.1 mm.
Optionally, after the welding is completed, the redundant power-down flat wire can be cut to facilitate subsequent packaging.
S5: encapsulate iron core 1 on lead frame 2, can adopt injection moulding's mode to encapsulate iron core 1 on lead frame 2, guaranteed iron core 1 and lead frame 2's connection stability on the one hand to promoted the encapsulation effect to iron core 1, on the other hand has promoted encapsulation efficiency, thereby promoted the production efficiency of inductance.
Specifically, the step of packaging the core 1 on the lead frame 2 is as follows:
s51: after the die is preheated, the iron core 1 is placed into the die, the die can adopt a one-die multi-cavity structure, the die is heated by a heating pipe or an oil temperature loop, and the temperature of the die is set to be 60-80 ℃. The processing mode of hot runner injection molding is realized by preheating the mold, the process can improve the utilization rate of injection molding materials, low-pressure injection molding can be realized, and the phenomenon of short circuit between the injection molding raw materials and the conductive flat wire 3 is well avoided, so that the manufacturing yield of the inductor is improved.
S52: the encapsulation part 4 is formed by injection molding to encapsulate the core 1 on the lead frame 2. The injection molding process may include the following steps:
the first step is as follows: cutting a material sheet (the material sheet is a sheet-shaped lead frame 2, each lead frame 2 is provided with a plurality of iron cores 1) with iron cores 1 into single strips, grabbing the single strips onto a mold by a manipulator, and matching positioning pins on the mold with positioning holes on the lead frame 2 to avoid the eccentric problem in the injection molding process;
a second part: the injection molding machine injects the liquid mixed powder glue into the cavity of the mold, and because the mold is preheated, the stress is relatively small in the cooling process, and the problem of interface cracking is not easy to occur;
the third step: and ejecting a product after injection molding by the mold ejection needle.
The injection molding raw material is mixed powder of engineering plastic particles and alloy iron powder, and the mass percentage of the alloy iron powder is 70-80%. Alternatively, the engineering plastic particles can be made of high-temperature-resistant engineering plastics such as PS and PPS.
S53: cutting the packaged finished product to enable the lead frame 2 to be flush with the outer edge of the packaging part 4; and after the injection molding is finished, conveying the packaged finished product into a cutting die by using a manipulator, cutting the strip-shaped material sheet into a plurality of sections by using cutting particles, wherein each section of material sheet is provided with an iron core 1, and the lead frame 2 of the section of material sheet is flush with the outer edge of the packaging part 4.
S54: and tempering the finished product after cutting, wherein the stress of the finished product can be released for the second time through tempering, and the problem that the finished product is cracked due to different thermal expansion coefficients of the iron core 1 and the injection molding raw material is avoided, so that the manufacturing yield of the inductor is improved.
The inductor manufacturing method provided by the embodiment of the invention has the following beneficial effects:
firstly, the method comprises the following steps: the manufacturing of the small-size iron core 1 can be realized, more use space is reserved for the small-size PCB, and the miniaturization arrangement of the PCB is facilitated;
secondly, the method comprises the following steps: the size range of the finished inductor is large, the coverage area is wide, and the application range of the product is wide;
thirdly, the method comprises the following steps: the inductance of the finished inductor is greatly increased, the loss is greatly reduced, and the high-frequency use environment of more than 500Khz can be met;
fourthly: the direct current resistance of the finished inductor is reduced by 10-20%, the resonant frequency is above 100MHZ, and the inductor has a relatively excellent high-frequency characteristic;
fifth, the method comprises the following steps: the process flow is simple, the time consumption is short, and the production efficiency can be improved by more than 3%.
In the description herein, references to the description of "some embodiments," "other embodiments," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
The above description is only a preferred embodiment of the present invention, and for those skilled in the art, the present invention should not be limited by the description of the present invention, which should be interpreted as a limitation.
Claims (10)
1. A method of manufacturing an inductor, comprising:
manufacturing an iron core (1) by using alloy powder;
fixing the iron core (1) on a lead frame (2);
winding a conductive flat wire (3) on the iron core (1);
welding the leading-out end of the conductive flat wire (3) on the lead frame (2) by adopting laser spot welding;
and encapsulating the iron core (1) on the lead frame (2).
2. The inductance manufacturing method according to claim 1, wherein the manufacturing process of the iron core (1) comprises:
pressing and molding alloy powder to produce a blank;
cutting the blank into an I-shaped transitional blank body;
sintering the transition blank;
passivating the sintered transition blank to produce the iron core (1).
3. The method of manufacturing an inductor according to claim 2, wherein the alloy powder is an alloy iron powder, and the temperature for sintering the transition green body is 600 ℃ to 890 ℃.
4. The inductor manufacturing method according to claim 1, wherein the iron core (1) is bonded to the lead frame (2).
5. The inductance manufacturing method according to claim 4, wherein the step of bonding the iron core (1) comprises:
dripping glue on the lead frame (2) by adopting a probe head;
adsorbing the iron core (1) by using a vacuum suction nozzle;
driving the vacuum suction nozzle to move so that the iron core (1) is pressed on the glue solution;
and baking the lead frame (2).
6. The inductor manufacturing method according to claim 5, wherein the lead frame (2) is baked in a tunnel oven and is positioned by a pinwheel when the lead frame (2) moves relative to the tunnel oven.
7. The inductor manufacturing method according to claim 1, wherein the step of encapsulating the core (1) on the lead frame (2) is as follows:
preheating a mould and then placing the iron core (1) into the mould;
injection molding to generate a packaging part (4) so as to package the iron core (1) on the lead frame (2);
cutting the packaged finished product to enable the lead frame (2) to be flush with the outer edge of the packaging part (4);
and tempering the cut finished product.
8. The method for manufacturing the inductor according to claim 7, wherein the injection molding raw material is a mixed powder of engineering plastic particles and alloy iron powder, and the mass ratio of the alloy iron powder is 70-80%.
9. The inductance manufacturing method according to claim 1, wherein the laser spot welding has a spot welding energy of 22J to 26J, a spot welding time of 8ms to 12ms, and a spot welding spot size of 0.05mm to 0.1 mm.
10. The inductance manufacturing method according to claim 1, characterized in that the flat conductive wire (3) is wound on the iron core (1) by a single-shaft winding mechanism, and the flat conductive wire (3) is provided with a positioning pin at the inlet end and the outlet end to position the flat conductive wire (3).
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|---|---|---|---|
| CN202111066881.3A CN113793749A (en) | 2021-09-13 | 2021-09-13 | Inductor manufacturing method |
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| CN202111066881.3A CN113793749A (en) | 2021-09-13 | 2021-09-13 | Inductor manufacturing method |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103295732A (en) * | 2013-05-29 | 2013-09-11 | 深圳顺络电子股份有限公司 | Winding power inductor and production method thereof |
| CN106653272A (en) * | 2017-02-08 | 2017-05-10 | 久利科技（苏州）有限公司 | Annular sensor with high radiating capacity and flat wires wound in upright manner and method for preparing annular sensor |
| US20190295760A1 (en) * | 2018-03-20 | 2019-09-26 | Shenzhen Sunlord Electronics Co., Ltd. | Inductive element and manufacturing method |
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- 2021-09-13 CN CN202111066881.3A patent/CN113793749A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103295732A (en) * | 2013-05-29 | 2013-09-11 | 深圳顺络电子股份有限公司 | Winding power inductor and production method thereof |
| CN106653272A (en) * | 2017-02-08 | 2017-05-10 | 久利科技（苏州）有限公司 | Annular sensor with high radiating capacity and flat wires wound in upright manner and method for preparing annular sensor |
| US20190295760A1 (en) * | 2018-03-20 | 2019-09-26 | Shenzhen Sunlord Electronics Co., Ltd. | Inductive element and manufacturing method |
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Application publication date: 20211214 |