Laser welding device

Abstract

The utility model discloses a laser welding device relates to laser welding technical field, wherein, laser welding device includes collimating mirror group and focusing lens. Collimating mirror group is used to collimate the laser that optical fiber emits to form collimating light. The focusing lens is located on the path of collimating light, and the focusing lens is used to focus collimating light to form first laser spot on the welding piece, and the focusing lens includes focusing convex lens, and the focusing convex lens is located on the path of laser, and the focusing convex lens is used to hold on the welding piece of upside. In the focusing convex lens is used to hold on the welding piece of upside, can realize the holding fixation between at least two welding pieces. Through the first focusing lens holds on the welding piece of upside, can accelerate the contact part welding of two welding parts, reduces the false welding and the phenomenon such as false welding, guarantees the welding quality.

Description

Technical Field

[0001] This utility model relates to the field of laser welding technology, and in particular to a laser welding device. Background Technology

[0002] Laser welding is commonly used in various welding applications, such as welding plastic parts. When welding plastic parts using a laser welding device, the areas to be welded between two plastic parts are often overlapped. The laser plastic welding device then uses a continuous laser beam, focused onto the plastic surface through a lens, causing the plastic to melt and join together. However, when the laser beam melts the plastic, it is difficult to ensure a proper connection between the molten areas of the two plastic parts, easily leading to incomplete welds or false welds, thus compromising weld quality. Utility Model Content

[0003] The main purpose of this invention is to provide a laser welding device that aims to ensure welding quality.

[0004] To achieve the above objectives, the laser welding apparatus proposed in this utility model includes:

[0005] Collimating lens assembly, used to collimate the laser emitted from the optical fiber to form collimated light; and,

[0006] A focusing lens, located in the path of collimated light, is used to focus the collimated light to form a first laser spot on the workpiece to be welded. The focusing lens includes a focusing convex lens, which is located in the path of the laser and is used to press against the workpiece to be welded on the upper side.

[0007] In one embodiment, the focusing lens further includes a focusing lens group located on the path of the collimated light. The focusing lens group and the focusing convex lens are arranged sequentially along the path of the laser. The focusing lens group focuses the collimated light to form a second laser spot, such that the second laser spot is located between the focusing convex lens and the focusing lens group.

[0008] The focusing lens group is adjustable to adjust the distance between the first laser spot and the focusing convex lens.

[0009] In one embodiment, the focusing convex lens includes a spherical lens.

[0010] In one embodiment, the focusing lens includes a mounting portion, and the spherical lens is spherically hinged to the mounting portion.

[0011] In one embodiment, the mounting portion includes a ball socket with a spherical inner cavity, the spherical lens being at least partially located within the spherical inner cavity, the ball socket having an inlet and an outlet of light disposed opposite to each other, and both the inlet and the outlet of light communicating with the spherical inner cavity;

[0012] The inner wall of the spherical cavity is provided with an air outlet to form a filling air gap between the inner wall of the spherical cavity and the spherical lens.

[0013] In one embodiment, the spherical inner cavity wall includes an air bladder wall, and the air outlet is disposed on the air bladder wall.

[0014] In one embodiment, multiple air vents are spaced apart on the inner wall of the spherical cavity.

[0015] In one embodiment, the laser welding apparatus further includes a galvanometer system comprising at least one mirror group, wherein at least one mirror group is located on the path of the collimated light, and the at least one mirror group is used to deflect the collimated light.

[0016] In one embodiment, at least one of the reflector groups includes a first reflector group and a second reflector group, which are arranged sequentially along the path of the laser.

[0017] In one embodiment, the first reflector group is rotatably disposed along an axis extending in a first direction, and the second reflector group is rotatably disposed along an axis extending in a second direction, wherein the first direction is perpendicular to the second direction.

[0018] In this invention, by using the focusing convex lens to press and hold the upper part to be welded, at least two parts to be welded can be pressed and fixed. The laser emitted from the end of the optical fiber is radial, and after passing through the collimating lens group, it forms a parallel collimated beam. After the collimated beam passes through the focusing convex lens of the focusing lens, it can be focused to form a first laser spot. This first laser spot penetrates the surface of the upper part to be welded, bringing it close to the contact area between the two parts. This facilitates melting of the contact area. After the contact area melts, pressing the upper part to be welded with the first focusing lens accelerates the welding of the contact area, reduces incomplete welds and false welds, and ensures welding quality. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0020] Figure 1 A schematic diagram of the structure of an embodiment of the laser welding device provided by this utility model;

[0021] Figure 2 for Figure 1 A schematic diagram of the installation of the spherical lens.

[0022] Explanation of icon numbers:

[0023] 1. Collimating lens group; 2. Optical fiber; 3. Collimating light; 4. Focusing lens; 41. Focusing convex lens; 42. Focusing lens group; 43. Mounting part; 431. Spherical inner cavity; 432. Light inlet; 433. Light outlet; 434. Air outlet; 435. Airbag wall; 436. Gas connector; 5. First laser spot; 6. Galvanometer system; 61. First reflecting mirror group; 62. Second reflecting mirror group; 7. Second laser spot.

[0024] The realization of the purpose, functional features and advantages of this utility model will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0025] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present utility model.

[0026] It should be noted that if the embodiments of this utility model involve directional indicators (such as up, down, left, right, front, back, etc.), the directional indicators are only used to explain the relative positional relationship and movement of the components in a specific posture. If the specific posture changes, the directional indicators will also change accordingly.

[0027] Furthermore, if the embodiments of this utility model involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the use of "and / or" or "and / or" throughout the text includes three parallel solutions. For example, "A and / or B" includes solution A, solution B, or a solution where both A and B are satisfied simultaneously. Furthermore, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this utility model.

[0028] Laser welding is commonly used in various welding applications, such as welding plastic parts. When welding plastic parts using a laser welding device, the areas to be welded between two plastic parts are often overlapped. The laser plastic welding device uses a continuous laser beam, focused onto the plastic surface through a lens. The laser beam relies solely on its own energy to melt and join the plastic, requiring a longer time to melt and connect, resulting in low welding efficiency and failing to meet the needs of large-scale production. Furthermore, when the laser beam melts the plastic, it is difficult to ensure a proper connection between the molten areas of the two plastic parts, easily leading to incomplete welds or false welds, thus compromising weld quality.

[0029] This utility model proposes a laser welding device.

[0030] Please see Figure 1 and Figure 2 In one embodiment of this utility model, the laser welding device includes a collimating lens group 1 and a focusing lens 4. The collimating lens group 1 is used to collimate the laser emitted from the optical fiber 2 to form collimated light 3. The focusing lens 4 is located in the path of the collimated light 3 and is used to focus the collimated light 3 to form a first laser spot 5 on the workpiece to be welded. The focusing lens 4 includes a focusing convex lens 41, which is located in the path of the laser and is used to press against the workpiece to be welded on the upper side.

[0031] In the technical solution of this utility model, by using the focusing convex lens 41 to press and hold the upper part to be welded, at least two parts to be welded can be pressed and fixed. The laser emitted from the end of the optical fiber 2 is radial, and after passing through the collimating lens group 1, it forms a parallel collimated light beam 3. After the collimated light beam 3 passes through the focusing convex lens 41 of the focusing lens 4, it can be focused to form a first laser spot 5, and the first laser spot 5 penetrates the surface layer of the upper part to be welded, so that the first laser spot 5 is close to the contact area of ​​the two parts to be welded, making it easier to melt the contact area of ​​the two parts to be welded. After the contact area of ​​the two parts to be welded melts, by pressing the upper part to be welded through the first focusing lens, the welding of the contact area of ​​the two parts to be welded can be accelerated, reducing phenomena such as incomplete welding and false welding, and ensuring welding quality.

[0032] The first laser spot 5 is the laser focal point formed after the laser beam is focused. The optical fiber 2 can be detachably connected to the laser welding device, allowing for the connection of different laser sources by replacing the optical fiber 2 to adapt to different welding requirements. The connection between the optical fiber 2 and the laser welding device can be any existing connection method, and is not limited here. After the collimating lens group 1 collimates the laser emitted from the optical fiber 2, the resulting collimated light beam 3 can directly enter the focusing lens 4, or it can enter the focusing lens 4 after reflection.

[0033] The collimating lens group 1 can be composed of multiple collimating lenses, which is not limited here; the collimating lenses can be selected from the existing collimating lens group 1 which is mature in the prior art.

[0034] Please see Figure 1 and Figure 2 The focusing lens 4 further includes a focusing lens group 42, which is located on the path of the collimated light 3. The focusing lens group 42 and the focusing convex lens 41 are arranged sequentially along the laser path. The focusing lens group 42 focuses the collimated light 3 to form a second laser spot 7, such that the second laser spot 7 is located between the focusing convex lens 41 and the focusing lens group 42. The focusing lens group 42 is adjustable to adjust the distance between the first laser spot 5 and the focusing convex lens 41.

[0035] The laser beam focused by the second laser spot 7 forms a laser focal point. After passing through the second laser spot 7, the laser beam diffuses and illuminates the focusing convex lens 41. After passing through the focusing convex lens 41, the laser beam is focused and forms a first laser spot 5. The distance between the first laser spot 5 and the focusing convex lens 41 corresponds to the distance between the second laser spot 7 and the focusing convex lens 41.

[0036] By adjusting the distance between the second laser spot 7 and the focusing convex lens 41, the distance between the first laser spot 5 and the focusing convex lens 41 can be adjusted. Specifically, when the second laser spot 7 is located beyond twice the focal length of the focusing convex lens 41, moving the focusing lens group 42 away from the focusing convex lens 41 allows the second laser spot 7 to move away from the focusing convex lens 41, while bringing the first laser spot 5 closer to the focusing convex lens 41, thereby heating the upper surface of the upper part to be welded. When the second laser spot 7 is located beyond twice the focal length of the focusing convex lens 41, moving the focusing lens group 42 closer to the focusing convex lens 41 allows the second laser spot 7 to move closer to the focusing convex lens 41, while moving the first laser spot 5 away from the focusing convex lens 41, causing the first laser spot 5 to form inside the upper part to be welded, thereby heating the area of ​​the upper part to be welded near the lower part to be welded.

[0037] The focusing lens group 42 can be a focusing lens 4 formed by combining multiple convex or concave lenses as needed, and is not limited here. The laser welding device includes a mounting base, on which both the focusing lens group 42 and the focusing convex lens 41 are mounted. The focal length of the focusing lens group 42 is adjustable, so that the distance between the second laser spot 7 and the focusing convex lens 41 can be changed by changing the focal length of the focusing lens group 42 without changing the distance between the focusing lens group 42 and the focusing convex lens 41. The focusing lens group 42 can be movably mounted on the mounting base, and the distance between the focusing lens group 42 and the focusing convex lens 41 can be changed by moving the focusing lens group 42 without changing the focal length; this is not limited here.

[0038] When the thickness of the plastic part to be welded on the upper side is small, the laser beam can easily penetrate the material. The laser beam is usually focused near the upper surface of the part to be welded. By adjusting the focusing lens group 42, the second laser spot 7 is moved away from the focusing convex lens 41, and the first laser spot 5 is moved closer to the focusing convex lens 41, thereby heating the upper surface of the part to be welded on the upper side, thereby achieving rapid welding.

[0039] When the thickness of the upper part to be welded is large, the laser beam is difficult to penetrate the material, and the laser beam is often focused into the interior of the part to be welded. By adjusting the focusing lens group 42, the second laser spot 7 can be brought closer to the focusing convex lens 41, and the first laser spot 5 can be moved away from the focusing convex lens 41, thereby heating the area of ​​the upper part to be welded near the lower part to be welded, thereby achieving deep welding.

[0040] When the plastic part to be welded on the upper side is made of transparent material, the transmittance of the laser is high. By adjusting the focusing lens, the first laser spot 5 can be formed inside the material to achieve deep welding.

[0041] When the plastic part to be welded on the upper side is made of an opaque material, its transmittance to the laser is low, making it difficult for the laser beam to penetrate the material. By adjusting the focusing lens, the first laser spot 5 can be positioned close to the upper surface of the material, enabling rapid welding.

[0042] By focusing a laser beam near the material surface, plastics can be rapidly heated and melted, increasing welding speed. Focusing the laser beam inside the material reduces the thermal impact on surrounding plastics, minimizing the heat-affected zone. Precise control of the laser spot size and shape allows for better control of heating and melting in the welding area, improving weld strength. Furthermore, it reduces the cost and time of changing lenses with different focal lengths, lowering overall costs. The shape and size of the laser beam can also be more flexibly controlled to adapt to different processing requirements.

[0043] Please see Figure 1 and Figure 2 The focusing convex lens 41 includes a spherical lens. While maintaining pressure on the workpiece to be welded, the spherical lens has a small focal length, which reduces the distance between the first laser spot 5 and the spherical lens, preventing the first laser spot 5 from passing through the workpiece to be welded.

[0044] The focusing lens 4 includes a mounting portion 43, to which the spherical lens is spherically hinged. When the laser welding device moves along the path to be welded, i.e., when welding is completed and the device moves to the next welding area, the spherical lens can rotate to achieve continuous welding along the welding path while reducing wear on the spherical lens.

[0045] The mounting portion 43 includes a spherical cavity with a spherical inner cavity 431. The spherical lens is at least partially located within the spherical inner cavity 431. The spherical cavity has an inlet 432 and an outlet 433 arranged opposite to each other. Both the inlet 432 and the outlet 433 are connected to the spherical inner cavity 431. An air outlet 434 is provided on the inner wall of the spherical inner cavity 431 to form a filling air gap between the inner wall of the spherical inner cavity 431 and the spherical lens.

[0046] The light inlet 432 allows the laser emitted from the focusing lens group 42 to pass through easily, and the light outlet 433 allows part of the spherical lens to be exposed. By supplying air to the air outlet 434, the airflow can fill the space between the inner wall of the spherical cavity 431 and the spherical lens, reducing the friction between the inner wall of the spherical cavity 431 and the spherical lens, thus protecting the spherical lens.

[0047] The spherical inner cavity 431 includes an air bladder wall 435, and the air outlet 434 is disposed on the air bladder wall 435. When the pressure between the spherical lens and the workpiece to be welded is high, the air bladder wall 435 can further reduce the damage to the spherical lens.

[0048] The spherical cavity includes an air bladder, which surrounds and forms the wall of the spherical inner cavity 431, without limitation.

[0049] Multiple air outlets 434 are spaced apart on the inner wall of the spherical cavity 431. The multiple air outlets 434 work together to ensure that the airflow evenly fills the space between the inner wall of the spherical cavity 431 and the spherical lens.

[0050] Multiple air vents 434 may be arranged circumferentially around the spherical lens to reduce friction on the periphery of the spherical lens.

[0051] Please see Figure 1 and Figure 2 The mounting part 43 is provided with a gas connector 436, which is used to connect to a gas source to supply gas to the gas outlet 434.

[0052] The laser welding apparatus further includes a galvanometer system 6, which comprises at least one set of reflectors. Each set of reflectors is located on the path of the collimated beam 3, and is used to deflect the collimated beam 3. When the collimating mirror set 1 is not coaxial with the focusing lens 4, the galvanometer system 6 can reflect the collimated beam 3, facilitating its delivery into the focusing lens 4.

[0053] The mirror assembly can be any existing mirror structure, and is not limited herein.

[0054] At least one of the reflector groups includes a first reflector group 61 and a second reflector group 62, which are arranged sequentially along the path of the laser. The first reflector group 61 and the second reflector group 62 enhance the adjustability of the orientation of the collimated light 3.

[0055] The first reflector group 61 is rotatably configured along an axis extending in a first direction, and the second reflector group 62 is rotatably configured along an axis extending in a second direction, wherein the first direction and the second direction are perpendicular. During the welding process, the laser welding device moves along a third direction. By controlling at least one of the first reflector group 61 and the second reflector group 62, the first laser spot 5 can be continuously moved along the third direction while simultaneously reciprocating to both sides. This makes the path of the first laser spot 5 wavy, increasing the area of ​​plastic melting, thereby increasing the welding area and ensuring the quality of the weld.

[0056] The laser welding device also includes a controller. Before welding, the welding path and welding depth can be input into the controller. The controller can control the movement of the focusing lens to ensure that the first laser spot 5 meets the requirements, and then control the movement of the first reflecting lens, the second reflecting mirror group 62, and the focusing lens 4 to move the first laser spot 5 along the preset welding path. Operators do not need to precisely control the position and energy of the laser beam, reducing the skill requirements for operators.

[0057] The above description is merely an exemplary embodiment of the present utility model and does not limit the patent scope of the present utility model. Any equivalent structural transformations made based on the technical concept of the present utility model and the contents of the present utility model specification and drawings, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the present utility model.

Claims

1. A laser welding apparatus, characterized in that, include: Collimating lens group is used to collimate the laser emitted from the optical fiber to form collimated light; as well as, A focusing lens, located in the path of collimated light, is used to focus the collimated light to form a first laser spot on the workpiece to be welded. The focusing lens includes a focusing convex lens, which is located in the path of the laser and is used to press against the workpiece to be welded on the upper side.

2. The laser welding apparatus as described in claim 1, characterized in that, The focusing lens also includes a focusing lens group, which is located on the path of the collimated light. The focusing lens group and the focusing convex lens are arranged sequentially along the path of the laser. The focusing lens group focuses the collimated light to form a second laser spot, such that the second laser spot is located between the focusing convex lens and the focusing lens group. The focusing lens group is adjustable to adjust the distance between the first laser spot and the focusing convex lens.

3. The laser welding apparatus as described in claim 2, characterized in that, The focusing convex lens includes a spherical lens.

4. The laser welding apparatus as described in claim 3, characterized in that, The focusing lens includes a mounting portion, and the spherical lens is spherically hinged to the mounting portion.

5. The laser welding apparatus as described in claim 4, characterized in that, The mounting part includes a ball socket, the ball socket has a spherical inner cavity, the spherical lens is at least partially located in the spherical inner cavity, the ball socket has an inlet and an outlet of light that are disposed opposite to each other, and the inlet and the outlet of light are both connected to the spherical inner cavity; The inner wall of the spherical cavity is provided with an air outlet to form a filling air gap between the inner wall of the spherical cavity and the spherical lens.

6. The laser welding apparatus as described in claim 5, characterized in that, The spherical inner cavity wall includes an air bladder wall, and the air outlet is located on the air bladder wall.

7. The laser welding apparatus as described in claim 5, characterized in that, Multiple air vents are spaced apart on the inner wall of the spherical cavity.

8. The laser welding apparatus as described in claim 1, characterized in that, The laser welding apparatus further includes a galvanometer system, which includes at least one set of mirrors. At least one set of mirrors is located on the path of the collimated light and is used to deflect the collimated light.

9. The laser welding apparatus as described in claim 8, characterized in that, At least one of the reflector groups includes a first reflector group and a second reflector group, which are arranged sequentially along the path of the laser.

10. The laser welding apparatus as described in claim 9, characterized in that, The first reflector group is rotatably configured along an axis extending in a first direction, and the second reflector group is rotatably configured along an axis extending in a second direction, wherein the first direction and the second direction are perpendicular.

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