CN211307433U

CN211307433U - Device for connecting plastic workpiece by laser beam

Info

Publication number: CN211307433U
Application number: CN201921164512.6U
Authority: CN
Inventors: 黄甲; 杨胜
Original assignee: Victory Photonics Technology Suzhou Co ltd
Current assignee: Victory Photonics Technology Suzhou Co ltd
Priority date: 2019-07-24
Filing date: 2019-07-24
Publication date: 2020-08-21
Anticipated expiration: 2029-07-24

Abstract

The utility model relates to a device of plastic work piece is connected to laser beam contains: a laser beam entrance port (1); a temperature monitoring device (2); a first laser lens (3); a pressure regulating device (4); a second laser lens (5); a cavity (6); a cambered surface lens group (7); a light-transmitting material (8); the laser beam entrance port is located on the top end of the cavity, the cambered surface lens group is located on the bottom end of the cavity, the pressure adjusting device (4) is installed outside the cavity (6), and the temperature monitoring device (2) is installed outside the cavity (6). The compressing device for laser plastic welding ensures that a part to be welded is firm in welding, sealed, equal in bearing pressure with a base metal, free of phenomena such as base metal overflow and the like, capable of welding a part with poor light transmission performance, high in equipment operation efficiency, low in cost, capable of monitoring welding quality and the like.

Description

Device for connecting plastic workpiece by laser beam

Technical Field

The utility model relates to a laser welding field, in particular to device that plastic work piece was connected to laser beam is a direct affiliated or the concrete technical field who directly uses.

Background

In laser welding of thermoplastics, sometimes also referred to as "laser transmission welding" or "transmission infrared welding", a light transmissive layer and a light absorptive layer are bonded together. The laser beam penetrates the laser-transparent (here transparent, not visible to the human eye, but transparent to the laser) layer and is converted into thermal energy in the laser-absorbing layer. During the welding process, as the two are pressed together, heat is transferred from the absorbing layer to the transparent layer, causing the two materials to melt into a joint, while internal pressure is generated due to thermal expansion and thermal expansion of the materials themselves, both internal and external pressure ensuring a strong weld of the two parts.

At present, laser welding plastics are mainly profile welding and quasi-synchronous welding, the two need an external manufacturing clamp and a clamping force, complex products need expensive jigs, and the laser welding plastics are only suitable for two-dimensional planes and have no time to three-dimensional products. Quasi-simultaneous welding is also affected by the size of the product specification. It is not very effective for large products. It is also most critical that the weld quality cannot be monitored while welding.

Contour welding and quasi-synchronous welding are prone to the following problems:

1) when the process parameters are set to be overlarge during welding, the early-stage temperature is low, and the later-stage temperature is gradually accumulated and increased, so that the welding defects such as through welding, burning through and the like of the plastic are easy to occur;

2) when the process parameters are set during welding, the temperature is not removed all the time, the base metal cannot be melted, and the later temperature is accumulated but the welding is not firm, is not sealed, cannot bear the welding defects of high pressure and the like;

3) when the process parameters are set properly during welding, the phenomenon that base metal overflows around a welding seam exists, and the welding of a welding piece with poor light transmission performance cannot be realized.

SUMMERY OF THE UTILITY MODEL

The utility model discloses the main technical problem who solves provides a device and method that plastic workpiece is connected to laser beam, can ensure to wait that a welding welds firmly, sealed, bearing pressure and base metal are equal, do not have base metal and spill over phenomenons such as, also can weld, equipment operating efficiency is high, save advantages such as spending to the not good welding of light transmission performance. Can be widely applied to the field of laser plastic welding.

In order to solve the technical problem, the utility model discloses a technical scheme be: a device and a method for laser beam joining of plastic workpieces, which comprises a machining head with a focusing device for the laser beam, a pressure device, and a temperature measuring device.

In a preferred embodiment of the present invention, the laser incident port is located at the top end of the device.

In a preferred embodiment of the present invention, the lens array is located at the bottom end of the device.

A device and a method for connecting plastic workpieces by laser beams comprise the following specific steps:

laser beams are emitted into the cavity 6 from the incident port 1, pass through the first laser lens 3 and the second laser lens 5, and then act on the cambered surface lens group 7. And then focusing on a point on the cambered lens group 7 to act on the transparent material 8 and the absorbing material 9 which need to be connected. The pressure regulating device 4 regulates the proper pressure to act on the products to be connected. The laser energy is converted into heat energy which is connected under the action of external pressure. The temperature monitoring device 2 and the laser beam coaxially monitor the temperature of the welding position, and the consistency of the welding seam is ensured. In principle, a set of cleaning devices can be integrated on the lens array 7 to keep the surface of the lens array clean all the time, and to increase the optical performance.

The utility model discloses the purpose is in order to overcome above-mentioned background art not enough, provides a laser plastics welded closing device, ensures to wait to weld a firm, sealed, bearing pressure and base metal match, do not have base metal and spill over phenomenons such as, also can weld, equipment operating efficiency is high, save advantages such as spending, control welding quality to the not good welding of light transmission performance.

Drawings

Fig. 1 is a schematic illustration of a cross-sectional view through a welding device and a product to be processed.

The components in figure 1 are labeled as follows: : 1. a laser beam entrance port; 2. a temperature monitoring device; 3. a first laser lens; 4. a pressure regulating device; 5. a second laser lens; 6. a cavity; 7. a cambered surface lens group; 8. a light transmissive material; 9. an absorbent material.

Fig. 2 shows a processing head with integrated camera, which corresponds to another variant of fig. one.

The components in fig. 2 are labeled as follows: : 1. a laser beam entrance port; 2. a temperature monitoring device; 3. a first laser lens; 4. a pressure regulating device; 5. a second laser lens; 6. a cavity; 7. a cambered surface lens group; 8. a light transmissive material; 9. an absorbent material; 10. a camera module device.

Fig. 3 is a schematic view of a three-dimensional welding method in which the apparatus is mounted on a robot or a large machine tool;

the components in fig. 3 are labeled as follows: 7. a cambered surface lens group; 11. welding tracks; 12. a three-dimensional structure workpiece; 13. welding seams; 14. a robot or a multi-axis motion platform.

Detailed Description

In the following, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings, so that the advantages and features of the present invention can be more easily understood by those skilled in the art, thereby making more clear and definite definitions of the protection scope of the present invention.

Please refer to FIG. 1

An apparatus for laser beam joining plastic workpieces, comprising: 1. a laser beam entrance port; 2. a temperature monitoring device; 3. a first laser lens; 4. a pressure regulating device; 5. a second laser lens; 6. a cavity; 7. a cambered surface lens group; 8. a light transmissive material; 9. an absorbent material.

The laser beam entrance port 1 is used for introducing laser light.

The cavity 6 is used for installing the laser beam incident port 1, the first laser lens 3, the second laser lens 5, the temperature monitoring device 2 and the cambered surface lens group 7.

Pressure adjusting device 4 is installed outside cavity 6, from last laser lens 3, second laser lens 5, cambered surface battery of lens 7 of down installing in proper order in the cavity 6, laser port 1 is located 6 tops of cavity, laser beam incident port 1 is used for the leading-in with laser.

The first laser lens 3 is used for reflecting the measuring laser beam in the temperature monitoring device 2 to the bottom and coinciding with the laser energy beam, so that the measuring accuracy is guaranteed;

the second laser lens 5 is used for focusing the laser energy beam and the measuring laser beam on the cambered surface lens group 7;

the pressure regulating device 4 is used to provide a constant pressing force.

The temperature monitoring device 2 is used for monitoring the temperature of the welding position.

The cambered surface lens group 7 is used for compressing a welding surface and cooling a welding part;

the use method of the device for connecting the plastic workpieces by the laser beams comprises the following specific steps:

laser beams are emitted into the cavity 6 from the incident port 1, pass through the first laser lens 3 and the second laser lens 5, and then act on the cambered surface lens group 7. Then, the lens group 7 is focused on a point, and acts on the absorbing material 9 through the transparent material 8. The pressure regulating device 4 regulates the proper pressure to act on the surfaces of the materials to be connected. The laser energy is converted into heat energy which acts on the absorbing material 9, and the absorbing material 9 transfers the heat energy to the transparent material 8, and the transparent material 8 and the absorbing material 9 are connected under the action of external pressure. In the process, the temperature monitoring device 2 and the laser beam coaxially monitor the temperature of the welding position, and the temperature of the welding position is ensured to be consistent, so that the stability of the welding quality is achieved. In principle, a set of cleaning devices can be integrated on the lens array 7 to keep the surface of the lens array clean all the time, and to increase the optical performance.

The essential features and advantages of the invention will be further explained below with reference to examples, but the invention is not limited to the embodiments listed.

Please refer to fig. 2

An apparatus for laser beam joining plastic workpieces, comprising: 1. a laser beam entrance port; 2. a temperature monitoring device; 3. a first laser lens; 4. a pressure regulating device; 5. a second laser lens; 6. a cavity; 7. a cambered surface lens group; 8. a light transmissive material; 9. an absorbent material; 10. a camera module device.

The camera module device 11 is installed outside the cavity 6, the camera module device 11 can assist in clearly seeing the welding track in programming, the superposition of the laser position and the welding seam position is not needed to be found by other means, and the center of the laser beam is always in the center of the welding position. This is a processing head with integrated camera, corresponding to the alternative of fig. 1.

Please refer to fig. 3

An apparatus for laser beam joining plastic workpieces, comprising: 1. a laser beam entrance port; 2. a temperature monitoring device; 3. a first laser lens; 4. a pressure regulating device; 5. a second laser lens; 6. a cavity; 7. a cambered surface lens group; 8. a light transmissive material; 9. absorbing material 11, welding track; 12. a three-dimensional structure workpiece; 13. welding seams; 14. a robot or a multi-axis motion platform.

Fig. 3 shows a three-dimensional welding method for mounting the device on a manipulator or a large machine tool, which comprises the following specific operation steps:

the welding apparatus is mounted on a robot or multi-axis motion stage 14 and moves on a three-dimensional structure workpiece 12 along a weld bead 13, and moves forward continuously along a welding locus 11. The welding device acts laser beams on the three-dimensional structure workpiece 12 through the cambered surface lens group 7 at the contact part of the welding device and the three-dimensional structure workpiece 12, so that the upper layer and the lower layer of the three-dimensional structure workpiece are connected.

The utility model discloses a weld along the profile contour of product.

Two modes can be selected for operation:

in the first mode, the second laser lens 5 is adjusted to focus the laser beam on one point after passing through the cambered surface device, and the laser beam can be directly irradiated to the welding surface for contour welding without contacting with a welding workpiece.

Mode two, the second laser lens 5 is adjusted to focus the laser beam on the curved surface after passing through the curved surface device, which not only focuses but also acts as an external mechanical pressing device. This cambered surface provides continuous pressure to the joint as it rubs against the surface of the weldment 13. This ensures constant pressure clamping while the laser heats the material.

The cambered surface device replaces a mechanical clamp, and simultaneously enlarges the application range of laser welding in continuous three-dimensional welding. Can be adapted to any shape of various complex two-dimensional and three-dimensional shapes without additional clamping devices. Can be flexibly applied.

Compared with the prior art, the utility model relates to a device of plastic work piece is connected to laser beam ensures to wait that a welding welds firmly, seals, bears pressure and matches with the base metal, does not have the base metal and spills over phenomenons such as, also can weld, equipment operating efficiency is high, save advantages such as spending, control welding quality to the not good welding of light transmission performance.

In the description of the present invention, it should be noted that the terms "upper", "lower", "left", "right", "inner", "outer", etc. indicate the position or positional relationship based on the position or positional relationship shown in the drawings, or the position or positional relationship that the products of the present invention are usually placed when used, and are only for convenience of description and simplification of the description, but do not indicate or imply that the device or element to which the term refers must have a stable position, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention.

The above only is the embodiment of the present invention, not limiting the patent scope of the present invention, all the equivalent structures or equivalent processes that are used in the specification and the attached drawings or directly or indirectly applied to other related technical fields are included in the patent protection scope of the present invention.

Claims

1. An apparatus for laser beam joining plastic workpieces, comprising: a laser beam entrance port (1); a temperature monitoring device (2); a first laser lens (3); a pressure regulating device (4); a second laser lens (5); a cavity (6); a cambered surface lens group (7); a light-transmitting material (8); the laser beam entrance port is located on the top end of the cavity, the cambered surface lens group is located on the bottom end of the cavity, the pressure adjusting device (4) is installed outside the cavity (6), and the temperature monitoring device (2) is installed outside the cavity (6).