阅读说明：本技术 一种点焊线圈的制备方法及电感 (Preparation method of spot welding coil and inductor ) 是由 王林科 卢军伟 于 2021-07-30 设计创作，主要内容包括：本发明涉及电感技术领域,公开一种点焊线圈的制备方法及电感,其中点焊线圈的制备方法包括如下步骤：S1.将连接线绕制为线圈,并在所述线圈的两端预留出线圈引出部；S2.去掉所述线圈引出部的漆皮；S3.对所述线圈引出部进行裁切,以减小所述线圈引出部的横截面积。利用该点焊线圈的制备方法制备的点焊线圈在焊接时不仅具有较高的焊接效率,而且具有较高的焊接质量,有利于保证电感的质量。(The invention relates to the technical field of inductors, and discloses a preparation method of a spot welding coil and an inductor, wherein the preparation method of the spot welding coil comprises the following steps: s1, winding a connecting wire into a coil, and reserving coil leading-out parts at two ends of the coil; s2, removing the paint coat of the coil leading-out part; and S3, cutting the coil leading-out part to reduce the cross sectional area of the coil leading-out part. The spot welding coil prepared by the preparation method of the spot welding coil has high welding efficiency and high welding quality during welding, and is beneficial to ensuring the quality of the inductor.)

1. A preparation method of a spot welding coil is characterized by comprising the following steps:

s1, winding a connecting wire into a coil, and reserving coil leading-out parts at two ends of the coil;

s2, removing the paint coat of the coil leading-out part;

and S3, cutting the coil leading-out part to reduce the cross sectional area of the coil leading-out part.

2. The method of producing a spot welding coil according to claim 1, wherein step S3 includes:

s31, judging that the connecting wire is a round wire or a flat wire;

s32, if the connecting wire is a round wire, preprocessing the coil leading-out part, and then cutting the coil leading-out part; and if the connecting wire is a flat wire, cutting the coil leading-out part.

3. The method of producing a spot welding coil according to claim 2, wherein the pretreatment of the coil lead-out portion is: flattening the coil leading-out part.

4. The production method of a spot welding coil according to claim 3, wherein the cutting of the coil lead-out portion is performed in a width direction of the coil lead-out portion.

5. The method of producing a spot welding coil according to claim 2, wherein the coil lead-out portion of the round wire is flattened to have a thickness in a range ofWhere Φ is the diameter of the round wire.

6. The production method of a spot welding coil according to claim 2, wherein the width range of the round wire after the coil lead-out portion is cut isWhere Φ is the diameter of the round wire.

7. The method of producing a spot welding coil according to claim 2, wherein the width of the flat wire after the coil lead-out portion is cut is in a range ofWherein L is the width of the flat wire.

8. An inductor comprising a spot welding coil prepared by the method for preparing a spot welding coil according to any one of claims 1 to 7, a terminal and a base, the coil lead-out portion of the spot welding coil being connected to the terminal, the spot welding coil being mounted in the base, and the terminal being mounted on the surface of the base.

9. The inductor as claimed in claim 8, wherein the coil lead-out portion and the terminal are connected by soldering.

10. The inductor as claimed in claim 8, wherein the base is made of metal magnetic powder by die casting.

Technical Field

The invention relates to the technical field of inductors, in particular to a preparation method of a spot welding coil and an inductor.

Background

The integrally formed inductor generally includes a base and a winding body, the base is formed by embedding the winding body in metal magnetic powder and die-casting, and the SMD pins are lead-out portions of the winding body formed directly on the surface of the base. Because the magnetic shielding effect of the totally-enclosed structure of the integrally-formed inductor is good, electromagnetic interference can be effectively reduced, noise can be avoided, the DC impedance of the same size can be guaranteed to be the lowest, and the amplitude reduction of the current-resistant inductance can be guaranteed to be smooth, so that the application frequency of the inductor can reach 5MHz, and the inductor is widely applied to the fields of automobiles, medical use, pen-type electric equipment, Internet of things and the like at present.

In the existing integrally formed inductor, a winding body is wound into a spot welding coil with certain inner diameter and number of turns by adopting a round wire or a flat wire according to the product requirement, and then the spot welding coil is welded with a terminal, so that the aim of conducting the spot welding coil is fulfilled. However, for a round wire or a flat wire with a larger wire diameter (usually, a round wire with a diameter of more than 1.8mm, and a flat wire with a diameter of more than 3mm × 1 mm), when spot welding is performed, because the flowing current is large, the temperature of a welding machine electrode tip is high during work, long time is required for heat dissipation, the production efficiency is reduced, meanwhile, the loss of the electrode tip of the spot welding machine is large, poor false welding is easily generated, the quality of a product is reduced, and a terminal sheet connected with a connecting wire is easily damaged due to heating, so that the inductance quality is reduced.

Disclosure of Invention

The invention aims to provide a preparation method of a spot welding coil, and the spot welding coil prepared by the preparation method of the spot welding coil has high welding efficiency and high welding quality during welding, and is beneficial to ensuring the quality of an inductor.

In order to achieve the purpose, the invention adopts the following technical scheme:

a preparation method of a spot welding coil comprises the following steps:

s1, winding a connecting wire into a coil, and reserving coil leading-out parts at two ends of the coil;

s2, removing the paint coat of the coil leading-out part;

and S3, cutting the coil leading-out part to reduce the cross sectional area of the coil leading-out part.

As a preferable aspect of the method for manufacturing the spot welding coil, step S3 includes:

s31, judging that the connecting wire is a round wire or a flat wire;

s32, if the connecting wire is a round wire, preprocessing the coil leading-out part, and then cutting the coil leading-out part; and if the connecting wire is a flat wire, cutting the coil leading-out part.

As a preferable mode of the method for manufacturing the spot welding coil, the pretreatment of the coil lead-out part is: flattening the coil leading-out part.

As a preferable aspect of a manufacturing method of a spot welding coil, cutting of the coil lead-out portion is performed in a width direction of the coil lead-out portion.

As a preferable scheme of the preparation method of the spot welding coil, the thickness range of the flattened coil leading-out part of the round wire isWhere Φ is the diameter of the round wire.

As a preferable mode of the manufacturing method of the spot welding coil, the width range of the coil lead-out part of the round wire after cutting isWhere Φ is the diameter of the round wire.

As a preferable mode of the manufacturing method of the spot welding coil, the width range of the flat wire after the coil leading-out part is cut isWherein L is the width of the flat wire.

Another object of the present invention is to provide an inductor which has high production efficiency and good quality.

In order to achieve the purpose, the invention adopts the following technical scheme:

an inductor comprises a spot welding coil, a terminal and a seat body, wherein the spot welding coil, the terminal and the seat body are prepared by the spot welding coil preparation method provided by the technical scheme, the coil leading-out part of the spot welding coil is connected with the terminal, the spot welding coil is installed in the seat body, and the terminal is installed on the surface of the seat body.

Preferably, the coil lead-out portion and the terminal are connected by soldering.

As a preferable scheme of the inductor, the base body is made of metal magnetic powder through die casting.

The invention has the beneficial effects that:

the invention provides a preparation method of a spot welding coil. According to the method, the cross-sectional area of the leading-out part of the coil is reduced, so that the flowing current is reduced, the heat generated by the spot welding coil during welding is reduced, the temperature of the electrode tip of the spot welding machine is reduced, the heat dissipation time of the electrode tip of the spot welding machine is shortened, the welding efficiency is improved, the welding quality is improved, and the quality of the inductor is favorably ensured.

The invention also provides an inductor, which has high production efficiency and higher product quality due to the fact that the inductor comprises the spot welding coil, the terminal and the base body which are prepared by the preparation method of the spot welding coil provided by the technical scheme.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings used in the description of the embodiments of the present invention will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the contents of the embodiments of the present invention and the drawings without creative efforts.

Fig. 1 is a flowchart of a method of manufacturing a spot welding coil according to an embodiment of the present invention;

FIG. 2 is a top view of a circular wire spot weld coil provided in accordance with an embodiment of the present invention;

FIG. 3 is a top view of a spot welded coil of flat wire provided in accordance with an embodiment of the present invention;

FIG. 4 is a front view of a spot welded coil of flat wire provided in accordance with an embodiment of the present invention;

FIG. 5 is a flowchart of step S3 of FIG. 1;

FIG. 6 is a top view of a flattened circular wire stitch coil provided in accordance with an embodiment of the present invention;

FIG. 7 is a front view of a flattened wire tack welded coil provided in accordance with an embodiment of the present invention;

FIG. 8 is a cut-away top view of a spot welded coil of flat wire provided in accordance with an embodiment of the present invention;

fig. 9 is a schematic structural diagram of an inductor according to an embodiment of the present invention, in which a portion of the base is removed.

In the figure:

1. a coil lead-out section; 2. a terminal; 3. a base body.

Detailed Description

In order to make the technical problems solved, technical solutions adopted and technical effects achieved by the present invention clearer, the technical solutions of the embodiments of the present invention will be described in further detail below with reference to the accompanying drawings, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

In the description of the present invention, unless expressly stated or limited otherwise, the terms "connected," "connected," and "fixed" are to be construed broadly, e.g., as meaning permanently connected, removably connected, or integral to one another; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

In the present invention, unless otherwise expressly stated or limited, "above" or "below" a first feature means that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact with each other via another feature therebetween. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.

The following further describes a manufacturing method of a spot welding coil and a technical scheme of an inductor provided by the invention by combining the accompanying drawings and through specific embodiments.

The present embodiment provides a method for manufacturing a spot welding coil, as shown in fig. 1, the method for manufacturing a spot welding coil includes the steps of:

s1, winding the connecting wire into a coil, and reserving coil leading-out parts at two ends of the coil.

That is, according to the product characteristics of the inductance to be manufactured by spot welding the coil, the connecting wire is wound into the coil as shown in fig. 2 to 4, and coil lead-out portions for electrically connecting the coil with external parts are reserved at both ends of the coil.

S2, removing the paint skin of the coil leading-out part.

That is, the enamel coating of the coil lead-out portion is peeled off, so that the coil lead-out portion is electrically connected with external parts. Preferably, the lacquer coating of the coil leading-out part is removed by using a mechanical peeling mode or a laser peeling mode.

And S3, cutting the coil leading-out part to reduce the cross sectional area of the coil leading-out part.

That is, the coil lead-out portion is cut to reduce the cross-sectional area of the coil lead-out portion, so that the current flowing therethrough is reduced.

Specifically, as shown in fig. 5, step S3 includes the steps of:

s31, judging that the connecting wire is a round wire or a flat wire.

That is, whether the connection line is a round line or a flat line is determined by the cross-sectional shape of the connection line. If the cross section of the connecting wire is circular, the connecting wire is a round wire, and if the cross section of the connecting wire is circular, the connecting wire is similar to a round-corner rectangle, and the connecting wire is a flat wire.

S32, if the connecting wire is a round wire, preprocessing the coil leading-out part, and then cutting the coil leading-out part; and if the connecting wire is a flat wire, cutting the coil leading-out part.

That is, if the connection line is determined to be a round line, the coil lead-out portion needs to be pre-processed and then the pre-processed coil lead-out portion needs to be cut. Specifically, the pretreatment of the coil lead-out part is as follows: the coil lead-out portion is flattened, and the flattened circular wire coil is shown in fig. 6. It can be understood that the operator changes the shape of the coil-drawn portion of the round wire by pressing it with the press. Further, the output end of the pressing machine is provided with a flattening tool, and the flattening tool can flatten the circular coil leading-out part into a preset shape.

The flattened coil lead-out portion is cut along the width direction of the coil lead-out portion to reduce the width of the flattened coil lead-out portion, thereby reducing the area of the cross section of the coil lead-out portion.

Preferably, as shown in fig. 7, the coil lead-out portion of the round wire is flattened to have a thickness in the range ofWherein phi is the diameter of the round wire, and the thickness range can ensure the current passing capability of the coil leading-out part. The width range of the cut coil leading-out part of the round wire isThe width range can ensure that the coil leading-out part has enough strength and is not easy to break. In this embodiment, the coil lead-out portion of the round wire is flattened to have a thickness in the range ofThe width of the cut coil leading-out part of the round wire is phi, so that the sectional area of the coil leading-out part is reduced, and the structural strength of the coil leading-out part can be ensured.

If the connecting wire is judged to be a flat wire, the coil leading-out part can be directly cut. Likewise, the cutting of the coil lead-out portion of the rectangular wire is performed in the width direction of the coil lead-out portion to reduce the width of the coil lead-out portion of the rectangular wire, thereby reducing the area of the cross section of the coil lead-out portion.

PreferablyAs shown in fig. 8, the width of the rectangular wire after cutting the coil lead-out portion is within a range ofWherein L is the width of flat line, and this width scope can guarantee the ability of coil extraction portion through current, can guarantee again that coil extraction portion has sufficient intensity, difficult fracture. Specifically, the width of the flat wire after the coil lead-out portion is cut isThe sectional area of the coil leading-out part is reduced, and the structural strength of the coil leading-out part can be ensured.

The present embodiment further provides an inductor, as shown in fig. 9, the inductor includes a spot welding coil prepared by the above method for preparing a spot welding coil, a terminal, and a base, wherein a coil lead-out portion of the spot welding coil is connected to the terminal, the spot welding coil is installed in the base, and the terminal is installed on a surface of the base. Preferably, the coil lead-out portion and the terminal are connected by welding, so that the impedance value between the coil lead-out portion and the terminal is small, and the amplitude reduction of the current resistance inductance value is smooth. Further, the pedestal is made for metal magnetic powder die-casting for the spot welding coil is surrounded by metal magnetic powder, and it is totally closed structure, and the magnetism shielding effect is good, can effectively reduce electromagnetic interference, avoid the noise.

The preparation method of the inductor comprises the following steps: the spot welding coil prepared by the preparation method of the spot welding coil provided by the technical scheme is welded with the terminal, then the welded product is placed in a forming die cavity, and metal magnetic powder is added into the forming die cavity for pressing, so that the integrally formed inductor can be obtained.

It should be understood that the above-described embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. Numerous obvious variations, adaptations and substitutions will occur to those skilled in the art without departing from the scope of the invention. And are neither required nor exhaustive of all embodiments. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the claims of the present invention.

It is noted that reference throughout this specification to "some embodiments," "other embodiments," or the like, means 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.