High-precision laser welding temperature measurement optical equipment and system

Abstract

The invention provides a high-precision laser welding temperature measurement optical device and system, and the device comprises a welding mechanism which comprises a laser transmission joint, a light path transmission lens and a dual-band achromatic field lens, and the light path transmission lens is disposed between the laser transmission joint and the dual-band achromatic field lens; and the temperature detection mechanism comprises a temperature measurement sensor and a temperature signal processor, and the temperature measurement sensor is in signal connection with the temperature signal processor. According to the laser welding device, laser welding machining is conducted on the to-be-welded element through the welding mechanism, effective overlapping and synchronous follow-up of double light spots can be guaranteed through the double-waveband achromatic field lens, and therefore the purpose of guaranteeing the consistency and quality stability of the welding process is achieved. In the process, the temperature detection mechanism can analyze and monitor the welding heat according to the feedback laser, and compared with existing conventional laser welding equipment, the laser welding equipment has the advantages of being high in welding quality, capable of achieving real-time monitoring, accurate in temperature detection, high in effect speed, wide in application range and the like.

Description

Technical Field

[0001] The invention relates to the technical field of laser welding, and in particular to a high-precision laser welding temperature measurement optical device and system. Background Art

[0002] In the current field of laser welding technology, the traditional welding method mainly relies on simple beam expansion and collimation technology, and then uses the field lens of the post-focusing scheme to directly focus the laser beam on the welding surface. This welding method is simple in operation, which makes it widely used to a certain extent. However, with the development of precision manufacturing technology, this traditional laser welding technology has gradually exposed some technical bottlenecks in practical applications, especially when welding polymer materials, these problems are particularly significant.

[0003] Since the existing technology lacks effective monitoring of real-time laser energy on the welding surface, the welding quality is often difficult to guarantee when the polymer material is poorly pressed or the material transmittance is not ideal. The lack of such monitoring leads to the inability to adjust the fluctuation of laser energy in the welding process in a timely manner, thus affecting the strength and appearance quality of the welded joint. In addition, due to the differences in material properties, the traditional single laser welding technology is difficult to adapt to the welding requirements of different materials, which greatly limits the application scope of laser welding technology in the field of precision manufacturing. Summary of the invention

[0004] To this end, the technical problem to be solved by the present invention is to overcome the problems of low controllability and limited scope of application of laser welding in the prior art, and to provide a high-precision laser welding temperature measurement optical device and system.

[0005] In order to solve the above technical problems, the present invention provides a high-precision laser welding temperature measurement optical device, which includes: a welding mechanism, the welding mechanism includes a laser transmission joint, an optical path transmission lens and a dual-band achromatic field mirror, the optical path transmission lens is arranged between the laser transmission lens and the dual-band achromatic field mirror, wherein the laser transmission lens is externally connected to a laser generating device, the welding laser is output by the laser transmission lens, and after being reflected by the optical path transmission lens, it is transmitted by the dual-band achromatic field mirror toward the surface to be welded; a temperature detection mechanism, the temperature detection mechanism includes a temperature sensor and a temperature signal processor, the temperature sensor and the temperature signal processor are signal-connected, wherein the temperature sensor and the dual-band achromatic field mirror are respectively arranged on opposite sides of the optical path transmission lens, and the feedback laser at the welding point is collected by the dual-band achromatic field mirror and then transmitted to the temperature sensor through the optical path transmission lens.

[0006] In one embodiment of the present invention, the welding mechanism further includes an optical collimator, and the optical collimator is disposed between the laser transmission connector and the optical path transmission lens.

[0007] In one embodiment of the present invention, the optical path transmission lens includes a transmissive body and a reflective surface. The reflective surface is arranged on one side of the transmissive body and is arranged toward the laser transmission connector and the dual-band achromatic field mirror to guide the welding laser. The temperature sensor is arranged on the other side of the transmissive body to receive the feedback laser.

[0008] In one embodiment of the present invention, the welding mechanism further includes a dual-band galvanometer, the band galvanometer is arranged between the optical path transmission lens and the dual-band achromatic field lens, and the temperature signal processor is connected to the dual-band galvanometer.

[0009] In one embodiment of the present invention, the welding mechanism also includes an assembly frame, the interior of the assembly frame is a hollow structure, the optical path transmission lens is arranged in the assembly frame, the laser transmission connector, the dual-band achromatic field mirror and the temperature sensor are arranged around the assembly frame, and the laser transmission connector and the temperature sensor are arranged relative to each other.

[0010] In one embodiment of the present invention, the welding mechanism further includes a transmission channel, and two ends of the transmission channel are respectively connected to the assembly frame and the dual-band galvanometer.

[0011] In one embodiment of the present invention, the temperature detection mechanism further includes a guide lens, and the guide lens is connected to the assembly frame to guide the feedback laser.

[0012] In one embodiment of the present invention, it also includes a control system, and the welding mechanism and the temperature detection mechanism are respectively connected to the control system.

[0013] In one embodiment of the present invention, the guide lens reflects 2.0-2.5 μm light waves, the light path transmission lens reflects 950-1000 nm light waves, and transmits 2.0-2.5 μm light waves.

[0014] The present invention also provides a high-precision laser welding temperature measurement optical system, which includes the above-mentioned high-precision laser welding temperature measurement optical device.

[0015] The above technical solution of the present invention has the following advantages compared with the prior art: The high-precision laser welding temperature measurement optical equipment and system described in the present invention performs laser welding processing on the welding components through a welding mechanism, wherein the dual-band achromatic field mirror can ensure the effective overlap and synchronous follow-up of the dual light spots, thereby allowing the laser energy of the two wavelengths to interact at the same position, thereby achieving a more uniform heating processing effect, thereby achieving the purpose of ensuring the consistency and quality stability of the welding process. In this process, the temperature detection mechanism can analyze and monitor the welding heat based on the feedback laser, thereby enabling the temperature detection mechanism to perform real-time temperature calibration of the welding process. Compared with existing conventional laser welding equipment, this application has significant advantages such as high welding quality, real-time monitoring, accurate temperature detection, fast effect speed, and a wide range of applications. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to make the contents of the present invention more clearly understood, the present invention is further described in detail below based on specific embodiments of the present invention in conjunction with the accompanying drawings.

[0017] Figure 1 It is a schematic diagram of the three-dimensional structure of a high-precision laser welding temperature measurement optical device in a preferred embodiment of the present invention; Figure 2 yes Figure 1 Schematic diagram of laser transmission in high-precision laser welding temperature measurement optical equipment.

[0018] Explanation of the reference numerals in the specification: 100, welding mechanism; 110, laser transmission joint; 120, optical path transmission lens; 130, assembly frame; 140, transmission channel; 150, dual-band galvanometer; 160, dual-band achromatic field mirror; 170, optical collimator; 200, temperature detection mechanism; 210, temperature sensor; 220, guide lens; 230, temperature signal processor. DETAILED DESCRIPTION

[0019] The present invention is further described below in conjunction with the accompanying drawings and specific embodiments so that those skilled in the art can better understand the present invention and implement it, but the embodiments are not intended to limit the present invention. Embodiment 1

[0020] See also Figure 1As shown, this embodiment provides a high-precision laser welding temperature measurement optical device, which includes: a welding mechanism 100, the welding mechanism 100 includes a laser transmission connector 110, an optical path transmission lens 120 and a dual-band achromatic field mirror 160, the optical path transmission lens 120 is arranged between the laser transmission lens and the dual-band achromatic field mirror 160, wherein the laser transmission lens is externally connected to a laser generating device, the welding laser is output by the laser transmission lens, and is reflected by the optical path transmission lens 120 and then emitted by the dual-band achromatic field mirror 160. 0 is transmitted toward the surface to be welded; a temperature detection mechanism 200, the temperature detection mechanism 200 includes a temperature sensor 210 and a temperature signal processor 230, the temperature sensor 210 and the temperature signal processor 230 are signal-connected, wherein the temperature sensor 210 and the dual-band achromatic field mirror 160 are respectively arranged on two opposite sides of the optical path transmission lens 120, and the feedback laser at the welding point is collected by the dual-band achromatic field mirror 160 and then transmitted to the temperature sensor 210 through the optical path transmission lens 120.

[0021] The high-precision laser welding temperature measurement optical device described in this embodiment performs laser welding processing on the welding element through the welding mechanism 100, wherein the dual-band achromatic field mirror 160 can ensure the effective overlap and synchronous follow-up of the dual light spots, thereby allowing the laser energy of the two wavelengths to interact at the same position, thereby achieving a more uniform heating processing effect, thereby achieving the purpose of ensuring the consistency and quality stability of the welding process. In this process, the temperature detection mechanism 200 can analyze and monitor the welding heat based on the feedback laser, thereby being able to perform real-time temperature calibration of the welding process through the temperature detection mechanism 200. Compared with existing conventional laser welding equipment, this application has significant advantages such as high welding quality, real-time monitoring, accurate temperature detection, fast effect speed, and a wide range of applications.

[0022] See also Figure 1 and Figure 2 As shown, in this embodiment, the laser transmission connector 110 is preferably a QBH connector, which can minimize the transmission loss of the high-power laser beam and has good mechanical and optical stability. Furthermore, its input end is externally connected to a welding laser generator, and its output end is connected to an optical collimator 170, which is arranged between the laser transmission connector 110 and the optical path transmission lens 120. Specifically, the optical collimator 170 can ensure that the laser beam maintains good linearity during transmission and reduce the divergence of the laser beam, thereby obtaining more accurate and concentrated laser energy at the welding point. The collimated laser beam can improve the welding accuracy and reduce the heat-affected area, thereby improving the welding quality.

[0023] Furthermore, the optical path transmission lens 120 in this embodiment has both reflection and transmission functions, and includes a transmission body and a reflection surface. The reflection surface is arranged on one side of the transmission body and is arranged toward the laser transmission connector 110 and the dual-band achromatic field mirror 160 to guide the welding laser. The temperature sensor 210 is arranged on the other side of the transmission body to receive the feedback laser. Specifically, the transmission body is preferably glass, and the reflection surface is preferably an aluminum metal coating. In different embodiments, the transmission body can also be configured as other materials with transmission function, such as plastic, etc., and the reflection surface can also be configured as other metal coatings, such as silver coating, etc. The present invention does not make specific restrictions on this. Furthermore, this design allows welding and temperature measurement to be performed simultaneously in the same optical path, thereby improving the integration and efficiency of the system.

[0024] In this embodiment, the welding mechanism 100 also includes a dual-band galvanometer 150, which is arranged between the optical path transmission lens 120 and the dual-band achromatic field lens 160. It can quickly and accurately control the direction of the laser beam so that the device is compatible with two light waves of different wavelengths, thereby improving the dual-band galvanometer 150 in laser welding. It is used to accurately guide the laser beam to the welding path to achieve fast and accurate laser beam output, thereby improving the flexibility and applicability of the device.

[0025] In order to achieve stable assembly connection between various mechanisms, the welding mechanism 100 in this embodiment further includes an assembly frame 130, the interior of the assembly frame 130 is a hollow structure, the optical path transmission lens 120 is tiltedly arranged in the assembly frame 130, the laser transmission connector 110, the dual-band achromatic field lens 160 and the temperature sensor 210 are arranged around the assembly frame 130, and the laser transmission connector 110 and the temperature sensor 210 are arranged opposite to each other. Specifically, the assembly frame 130 in this embodiment provides a platform for the installation connection of various mechanisms, which is preferably a hollow rectangular frame, wherein the optical path transmission lens 120 is tiltedly arranged in the assembly frame 130, and the laser transmission connector 110 and the temperature sensor 210 are arranged opposite to each other. Figure 1 The high-precision laser welding temperature measurement optical device shown is a reference object. The laser transmission connector 110 is connected to the top of the assembly frame 130. The dual-band achromatic field mirror 160 and the temperature measurement sensor 210 are respectively arranged on the left and right sides of the assembly frame 130. The miniaturized setting of the device is achieved through the reasonable layout of the above structures.

[0026] In order to improve the quality of laser transmission and avoid interference from the external environment during transmission, the welding mechanism 100 in this embodiment also includes a transmission channel 140, and the two ends of the transmission channel 140 are respectively connected to the assembly frame 130 and the dual-band galvanometer 150.

[0027] See also Figure 1 and Figure 2 As shown, the temperature detection mechanism 200 in this embodiment is used to perform temperature detection and feedback calibration for the feedback laser, wherein the temperature sensor 210 converts the feedback laser temperature signal detected by it into an electrical signal and transmits it to the temperature signal processor 230. Further, the temperature detection mechanism 200 also includes a guide lens 220, which is connected to the assembly frame 130 to guide the feedback laser to ensure that the feedback laser can enter the temperature sensor 210. Specifically, the temperature signal processor 230 is connected to the dual-band galvanometer 150. In actual use, the operator can adjust the guide lens 220 to calibrate the optical path according to the usage and environmental changes.

[0028] Specifically, the optical path transmission lens 120 in this embodiment is preferably a 980nm reflection and 2.3μm transmission lens, and the guide lens 220 is preferably a 2.3μm reflection lens. In other embodiments, the guide lens 220 can reflect 2.0~2.5μm light waves and / or the optical path transmission lens 120 can reflect 950~1000nm light waves and transmit 2.0~2.5μm light waves according to actual usage requirements. The present invention does not make specific restrictions on this.

[0029] This embodiment also includes a control system, and the welding mechanism 100 and the temperature detection mechanism 200 are respectively connected to the control system. During the actual production and processing process, the operator can perform real-time regulation and control of the above-mentioned structure through the control system, thereby improving the flexibility of the use of the equipment. Parameters can also be preset through the control system, thereby improving the degree of automation of the equipment.

[0030] The specific operation process of the high-precision laser welding temperature measurement optical device in this embodiment is described below: In the present application, the welding laser passes through the optical collimator 170, the optical path transmission lens 120, the transmission channel 140, the dual-band galvanometer 150 and the dual-band achromatic field lens 160 from the laser output connector and then acts on the component to be welded; the feedback laser is collected by the dual-band achromatic field lens 160 and then passes through the dual-band galvanometer 150, the transmission channel 140, the optical path transmission lens 120, the guide lens 220 and then enters the temperature sensor 210, and the temperature sensor 210 sends the corresponding temperature signal to the temperature signal processor 230. Embodiment 2

[0031] This embodiment provides a high-precision laser welding temperature measurement optical system, which includes the above-mentioned high-precision laser welding temperature measurement optical device.

[0032] In summary, the high-precision laser welding temperature measurement optical equipment and system described in the present invention performs laser welding processing on the welding components through the welding mechanism 100, wherein the dual-band achromatic field mirror 160 can ensure the effective overlap and synchronous follow-up of the dual light spots, thereby allowing the laser energies of the two wavelengths to interact at the same position, thereby achieving a more uniform heating processing effect, thereby achieving the purpose of ensuring the consistency and quality stability of the welding process. In this process, the temperature detection mechanism 200 can analyze and monitor the welding heat based on the feedback laser, thereby being able to perform real-time temperature calibration of the welding process through the temperature detection mechanism 200. Compared with existing conventional laser welding equipment, this application has significant advantages such as high welding quality, real-time monitoring, accurate temperature detection, fast effect speed, and a wide range of applications.

[0033] Obviously, the above embodiments are merely examples for clear explanation and are not intended to limit the implementation methods. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation methods here. The obvious changes or modifications derived from these are still within the protection scope of the invention.

Claims

1. A high-precision laser welding temperature measurement optical device, characterized in that: include: A welding mechanism, the welding mechanism comprising a laser transmission joint, an optical transmission lens and a dual-band achromatic field mirror, wherein the optical transmission lens is arranged between the laser transmission lens and the dual-band achromatic field mirror, wherein the laser transmission lens is externally connected to a laser generating device, and the welding laser is output by the laser transmission lens, reflected by the optical transmission lens, and then transmitted by the dual-band achromatic field mirror toward the surface to be welded; The temperature detection mechanism includes a temperature sensor and a temperature signal processor, and the temperature sensor and the temperature signal processor are signal-connected, wherein the temperature sensor and the dual-band achromatic field mirror are respectively arranged on opposite sides of the optical path transmission lens, and the feedback laser at the welding point is collected by the dual-band achromatic field mirror and then transmitted to the temperature sensor through the optical path transmission lens.

2. The high-precision laser welding temperature measurement optical device according to claim 1, characterized in that: The welding mechanism further comprises an optical collimator, which is arranged between the laser transmission joint and the optical path transmission lens.

3. The high-precision laser welding temperature measurement optical device according to claim 1, characterized in that: The optical path transmission lens includes a transmission body and a reflection surface. The reflection surface is arranged on one side of the transmission body and is arranged toward the laser transmission connector and the dual-band achromatic field mirror to guide the welding laser. The temperature sensor is arranged on the other side of the transmission body to receive the feedback laser.

4. The high-precision laser welding temperature measurement optical device according to claim 1, characterized in that: The welding mechanism also includes a dual-band galvanometer, which is arranged between the optical path transmission lens and the dual-band achromatic field lens, and the temperature signal processor is connected to the dual-band galvanometer.

5. The high-precision laser welding temperature measurement optical device according to claim 4, characterized in that: The welding mechanism also includes an assembly frame, the interior of the assembly frame is a hollow structure, the optical path transmission lens is arranged in the assembly frame, the laser transmission connector, the dual-band achromatic field mirror and the temperature sensor are arranged around the assembly frame, and the laser transmission connector and the temperature sensor are arranged relative to each other.

6. The high-precision laser welding temperature measurement optical device according to claim 5, characterized in that: The welding mechanism also includes a transmission channel, and two ends of the transmission channel are respectively connected to the assembly frame and the dual-band galvanometer.

7. The high-precision laser welding temperature measurement optical device according to claim 5, characterized in that: The temperature detection mechanism also includes a guide lens, which is connected to the assembly frame to guide the feedback laser.

8. The high-precision laser welding temperature measurement optical device according to claim 7, characterized in that: The guide lens reflects 2.0-2.5 μm light waves, the light path transmission lens reflects 950-1000 nm light waves, and transmits 2.0-2.5 μm light waves.

9. The high-precision laser welding temperature measurement optical device according to claim 1, characterized in that: It also includes a control system, and the welding mechanism and the temperature detection mechanism are respectively connected to the control system.

10. A high-precision laser welding temperature measurement optical system, characterized in that: A high-precision laser welding temperature measurement optical device comprising any one of claims 1 to 9.

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