CN112222616A - Laser welding method and voice coil motor - Google Patents
Laser welding method and voice coil motor Download PDFInfo
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- CN112222616A CN112222616A CN202010941749.1A CN202010941749A CN112222616A CN 112222616 A CN112222616 A CN 112222616A CN 202010941749 A CN202010941749 A CN 202010941749A CN 112222616 A CN112222616 A CN 112222616A
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- laser
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- elastic sheet
- welding method
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K26/00—Working by laser beam, e.g. welding, cutting or boring
- B23K26/20—Bonding
- B23K26/21—Bonding by welding
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E30/00—Energy generation of nuclear origin
- Y02E30/30—Nuclear fission reactors
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- Engineering & Computer Science (AREA)
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Abstract
The application is suitable for the laser welding field, provides a laser welding method for weld the shell fragment to the base, the shell fragment is the copper zirconium plating material, the laser welding method includes: stacking the elastic sheet on the base to enable the connecting part of the elastic sheet to cover the part to be welded on the base; the method comprises the steps of outputting a laser beam with the diameter of 6-9 mm by using a laser, amplifying the diameter of the laser beam by 1.2-1.7 times, and focusing the laser beam on a connecting part, wherein the connecting part is heated and contacts with a part to be welded so as to weld the elastic sheet on the base. The laser welding method has high welding yield. This application simultaneously provides a voice coil motor.
Description
Technical Field
The invention relates to the field of laser welding, in particular to a laser welding method and a voice coil motor.
Background
Recently, a Voice Coil Motor (VCM) is generally provided in a camera module in a mobile communication device and a small personal computer, and the VCM is used to adjust a distance between a lens and an image sensor in the camera module so that the camera module can obtain a high quality image.
In the assembling process of the semi-finished product of the voice coil motor, the connecting part of the elastic sheet needs to be welded on the base, however, poor welding conditions such as cold welding are easy to occur in the existing welding process, particularly for the elastic sheet made of copper-plated zirconium material, the elastic sheet cannot be tightly attached to the base during welding due to the fact that the elastic sheet is soft and easy to deform, a gap exists between the elastic sheet and the base, and therefore the cold welding is easy to occur. The traditional solution is to increase the laser impact force to press the gap, but the method only can improve the yield and cannot completely solve the problem of the gap.
Meanwhile, products with poor welding and products with qualified welding have similar appearances, are difficult to check by human eyes or instruments, and can only be checked in a sampling mode. When a product with poor welding is found, the machine can only be stopped and all the products in the same batch are electrified and inspected completely, so that the labor cost is consumed and the production efficiency is influenced.
Disclosure of Invention
The application provides a laser welding method and a voice coil motor, which are used for solving the problem of poor welding of an elastic sheet and improving the welding yield.
The embodiment of the application provides a laser welding method, which is used for welding an elastic sheet to a base, wherein the elastic sheet is made of copper-plated zirconium, and the laser welding method comprises the following steps:
stacking the elastic sheet on the base to enable the connecting part of the elastic sheet to cover the part to be welded on the base;
the method comprises the steps of outputting a laser beam with the diameter of 6-9 mm by using a laser, amplifying the diameter of the laser beam by 1.2-1.7 times, and focusing the laser beam on a connecting part, wherein the connecting part is heated and contacts with a part to be welded so as to weld the elastic sheet on the base.
In an embodiment, the portion to be welded of the base is plated with a copper layer.
In one embodiment, in the step of using the laser to weld the connecting part, the laser power is 35 w-55 w, the pulse width is 10 ms-30 ms, the frequency is 450 KHZ-550 KHZ, and the galvanometer speed is 350 mm/s-450 mm/, so as to slowly heat the connecting part.
In one embodiment, the diameter of the laser beam is enlarged by 1.5 times so that the diameter of the laser beam becomes 9mm to 13.5 mm.
In one embodiment, in the step of using the laser to weld the connection part, the path pattern scanned by the laser comprises at least one first line segment and at least one second line segment, and the connection point of the first line segment and the second line segment is a bending point.
In one embodiment, the first line segment and the second line segment are perpendicular.
In one embodiment, the path pattern includes 6 inflection points.
In one embodiment, when the connection portion is welded by using a laser, the connection portion has an absorptivity of 90% or more to the laser.
In one embodiment, the elastic sheet comprises an elastic sheet body, two connecting parts and two positioning pieces, wherein the two connecting parts and the two positioning pieces are respectively arranged at four corners of the elastic sheet body and are respectively provided with positioning holes;
positioning columns are arranged at four corners of the base respectively, each positioning column penetrates through the corresponding positioning hole respectively, and the part to be welded is located between the two adjacent positioning columns.
The embodiment of the application further provides a voice coil motor, which comprises an elastic sheet and a base, wherein the elastic sheet is welded on the base through the laser welding method.
In the laser welding method, the elastic sheet is stacked on the base, so that the connecting part of the elastic sheet covers the part to be welded on the base; the laser is used for outputting a laser beam with the diameter of 6-9 mm, the diameter of the laser beam is amplified by 1.2-1.7 times and then focused on the connecting part, and the connecting part is heated and contacts with a to-be-welded part so as to weld the elastic sheet on the base. The laser welding method is suitable for welding the elastic sheet made of the copper-plated zirconium material, and the laser beam is focused on the connecting part after being expanded, so that the absorption rate of the elastic sheet to laser can be improved, the elastic sheet is slightly deformed after being heated, the elastic sheet can be in close contact with the base and forms heat conduction with the copper layer, a slight gap generated in the manufacturing process is offset, the problem of insufficient soldering is avoided, the welding yield is improved, and the manufacturing cost is saved.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the embodiments or the prior art descriptions will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without inventive exercise.
Fig. 1 is a schematic structural diagram of a spring plate according to an embodiment of the present application;
FIG. 2 is a schematic structural diagram of a base according to an embodiment of the present application;
FIG. 3 is a schematic structural view of an embodiment of the present application after the spring plate and the base are welded;
FIG. 4 is a flow chart of a method of laser welding in an embodiment of the present application;
FIG. 5 is a schematic diagram of a path pattern of a laser scan according to an embodiment of the present application;
the designations in the figures mean:
10. a spring plate; 11. a spring plate body; 12. a connecting portion; 13. positioning plates; 20. a base; 21. a positioning column; 22. a copper layer; 200. a path graph; 201. a first line segment; 202. a second line segment; 203. and (4) a bending point.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in further detail below with reference to the accompanying drawings, which are examples. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
It will be understood that when an element is referred to as being "secured to" or "disposed on" another element, it can be directly or indirectly secured to the other element. When an element is referred to as being "connected to" another element, it can be directly or indirectly connected to the other element. The terms "upper", "lower", "left", "right", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description, and do not indicate or imply that the referred devices or elements must have a specific orientation, be constructed and operated in a specific orientation, and thus, are not to be construed as limiting the patent. The terms "first", "second" and "first" are used merely for descriptive purposes and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features. The meaning of "plurality" is two or more unless specifically limited otherwise.
To illustrate the technical solution of the present invention, the following description is made with reference to the specific drawings and examples.
The embodiment of the application provides a laser welding method, which is used for welding an elastic sheet to a base. Referring to fig. 1, in the present embodiment, the elastic sheet 10 includes an elastic sheet body 11, two connecting portions 12 and two positioning pieces 13. The elastic sheet body 11 is a hollow frame body, and the two connecting portions 12 and the two positioning pieces 13 are respectively disposed at four corners of the elastic sheet body 11 and are respectively provided with positioning holes 14. The connection portion 12 may be a pin (pin), but is not limited thereto. In other embodiments, the locating tab 13 may be omitted.
In this embodiment, the elastic sheet 10 is made of copper-plated zirconium, and the copper content is greater than or equal to 99% and the zirconium content is less than or equal to 1%. The thickness of the elastic sheet 10 may be 0.03mm, but is not limited thereto.
Referring to fig. 2, positioning posts 21 are respectively disposed at four corners of the base 20, and each positioning post 21 is respectively disposed in a corresponding positioning hole 14. In the present embodiment, two positioning columns 21 are respectively disposed at four corners of the base 20, and two positioning holes 14 are respectively disposed at four corners of the elastic sheet body 11, but not limited thereto.
In the present embodiment, the portions to be welded of the base 20 correspond to the two connecting portions 12 of the elastic sheet 10, so that the portions to be welded are two and located at two corners of the base 20. Preferably, each part to be welded is located between two adjacent positioning posts 21.
In the present embodiment, the base 20 is made of plastic, and a copper layer 22 is plated on the portion to be welded of the base 20 for facilitating the welding. Due to the good thermal conductivity of the copper layer 22, the welding effect can be improved during laser welding. It is understood that in other embodiments, the base 20 may be made of metal, and the copper layer may be omitted; alternatively, the copper layer is replaced by another metal layer with better thermal conductivity.
Referring to fig. 3, after the elastic sheet 10 is welded to the base 20, the elastic sheet 10 and the base 20 are stacked, and each positioning column 21 on the base 20 is respectively inserted into a corresponding positioning hole 14 on the elastic sheet 10.
Referring to fig. 1 to 4, an embodiment of the present application provides a laser welding method for welding the elastic sheet 10 to the base 20, the laser welding method includes the following steps.
S101, the elastic sheet 10 is stacked on the base 20, so that the connecting portion 12 of the elastic sheet 10 covers the portion to be welded on the base 20.
In the present embodiment, since the portions to be welded of the base 20 are plated with the copper layer 22, the connection portions 12 of the spring pieces 10 cover the copper layer 22 after the spring pieces 10 are stacked on the base 20. In order to accurately align the elastic sheet 10 and the base 20, the positioning posts 21 on the base 20 are respectively inserted into the corresponding positioning holes 14 on the elastic sheet 10.
And S102, welding the connecting part 12 by using a laser, wherein the connecting part 12 is heated and contacts the part to be welded so as to weld the elastic sheet 10 on the base 20.
When using laser welding connecting portion 12, connecting portion 12 is more than 90% to the absorptivity of laser, and connecting portion 12 takes place the part after being heated and melts and towards copper layer 22 deformation, consequently, does not have the clearance between connecting portion 12 and the copper layer 22, avoids the problem of rosin joint, has promoted welded yield.
In the step of using the laser to weld the connecting part 12, a laser beam with the diameter of 6 mm-9 mm is output by using a laser, and the diameter of the laser beam is enlarged by 1.2-1.7 times and then focused on the connecting part 12. After the diameter of the laser beam is enlarged, the laser point from the focusing position becomes small, and the penetrating power is strong. The laser beam can slowly heat connecting portion 12, and connecting portion 12 is heated and is out of shape towards copper layer 22, and connecting portion 12 and the contact of copper layer 22 produce the welding point to there is weld gap's problem in having solved shell fragment 10 and base 20 from essence, and then avoid the rosin joint.
Preferably, the laser power is 35 w-55 w, the pulse width is 10 ms-30 ms, the frequency is 450 KHZ-550 KHZ, the galvanometer speed is 350 mm/s-450 mm/, and the laser uses the above parameters to perform laser welding, so that the connecting part 12 can be heated slowly.
Preferably, the diameter of the laser beam is enlarged by 1.5 times so that the diameter of the laser beam becomes 9mm to 13.5 mm; the laser power is 45w, the pulse width is 20ms, the frequency is 500KHZ, and the galvanometer speed is 400 mm. By setting the laser welding parameters, the connection portion 12 can be ensured to be heated slowly in a short time, so that the connection portion 12 is partially melted and welded on the copper layer 22.
In one embodiment, the laser may be a fiber optic nanosecond laser welder, but is not so limited.
Referring to fig. 5, in the step of using the laser welding connection portion 12, the path graph 200 scanned by the laser includes at least one first line segment 201 and at least one second line segment 202, and a connection point of the first line segment 201 and the second line segment 202 is a bending point 203.
Since the connection point of the first line segment 201 and the second line segment 202 is the bending point 203, the laser beam is slowed down when passing through the bending point 203, thereby being beneficial to slowly heating the connection portion 12.
It is understood that the first line segment 201 and the second line segment 202 may be straight lines or curved lines.
In one embodiment, the plurality of first line segments 201 are parallel to each other, the plurality of second line segments 202 are parallel to each other, and the first line segments 201 and the second line segments 202 are perpendicular. It is understood that the first line segment 201 and the second line segment 202 may also be acute or obtuse.
In one embodiment, the path graph 200 includes four first line segments 201 and three second line segments 202, and the path graph 200 includes 6 inflection points 203, so that the path graph 200 is substantially "bow" shaped. By adopting the bow-shaped path graph 200, the laser welding area can be increased, and the welding effect is improved.
In the laser welding method, the elastic sheet 10 is firstly stacked on the base 20, so that the connecting part 12 of the elastic sheet 10 covers the part to be welded on the base 20; a laser is used for outputting a laser beam with the diameter of 6 mm-9 mm, the diameter of the laser beam is amplified by 1.2-1.7 times and then focused on the connecting portion 12, and the connecting portion 12 is heated and contacts with a portion to be welded so as to weld the elastic sheet 10 on the base 20. The laser welding method is suitable for welding the copper zirconium-plated elastic sheet, the laser beam is focused on the connecting part 12 after being expanded, and the laser absorption rate of the elastic sheet 10 can be improved, so that the elastic sheet 10 is slightly deformed after being heated, the elastic sheet 10 can be in close contact with the base 20 and forms heat conduction with the copper layer 22, a slight gap generated in the manufacturing process is offset, the problem of insufficient welding is avoided, the welding yield is improved, and the manufacturing cost is saved.
An embodiment of the present application provides a voice coil motor, which includes a spring plate 10 and a base 20, wherein the spring plate 10 is welded on the base 20 by the laser welding method according to any of the embodiments.
The above embodiments are only used to illustrate the technical solutions of the present application, and not to limit the same; although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications and substitutions do not substantially depart from the spirit and scope of the embodiments of the present application and are intended to be included within the scope of the present application.
Claims (10)
1. A laser welding method is used for welding an elastic sheet to a base, and is characterized in that the elastic sheet is made of copper-plated zirconium materials, and the laser welding method comprises the following steps:
stacking the elastic sheet on the base to enable the connecting part of the elastic sheet to cover the part to be welded on the base;
the method comprises the steps of outputting a laser beam with the diameter of 6-9 mm by using a laser, amplifying the diameter of the laser beam by 1.2-1.7 times, and focusing the laser beam on a connecting part, wherein the connecting part is heated and contacts with a part to be welded so as to weld the elastic sheet on the base.
2. The laser welding method as recited in claim 1, wherein the portion to be welded of the base is plated with a copper layer.
3. The laser welding method as claimed in claim 1, wherein in the step of welding the connection part using the laser, a laser power is 35w to 55w, a pulse width is 10ms to 30ms, a frequency is 450KHZ to 550KHZ, and a galvanometer speed is 350mm/s to 450mm/, so as to slowly heat the connection part.
4. The laser welding method according to claim 3, wherein the diameter of the laser beam is enlarged by 1.5 times so that the diameter of the laser beam becomes 9mm to 13.5 mm.
5. The laser welding method according to claim 1, wherein in the step of using the laser to weld the connection portion, a path pattern of a laser scan includes at least one first line segment and at least one second line segment, and a connection point of the first line segment and the second line segment is a bending point.
6. The laser welding method as recited in claim 5, wherein the first line segment and the second line segment are perpendicular.
7. The laser welding method of claim 6, wherein the path pattern comprises 6 inflection points.
8. The laser welding method according to claim 1, wherein an absorption rate of the laser light by the connecting portion when the connecting portion is welded using a laser is 90% or more.
9. The laser welding method according to claim 1,
the elastic sheet comprises an elastic sheet body, two connecting parts and two positioning sheets, wherein the two connecting parts and the two positioning sheets are respectively arranged at four corners of the elastic sheet body and are respectively provided with a positioning hole;
positioning columns are arranged at four corners of the base respectively, each positioning column penetrates through the corresponding positioning hole respectively, and the part to be welded is located between every two adjacent positioning columns.
10. A voice coil motor comprising a spring plate and a base, wherein the spring plate is welded to the base by the laser welding method according to any one of claims 1 to 9.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010941749.1A CN112222616B (en) | 2020-09-09 | 2020-09-09 | Laser welding method and voice coil motor |
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| CN202010941749.1A CN112222616B (en) | 2020-09-09 | 2020-09-09 | Laser welding method and voice coil motor |
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| CN112222616A true CN112222616A (en) | 2021-01-15 |
| CN112222616B CN112222616B (en) | 2022-08-26 |
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| Publication number | Publication date |
|---|---|
| CN112222616B (en) | 2022-08-26 |
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