CN113523552A - Laser welding equipment suitable for long-line welding and laser energy control method - Google Patents
Laser welding equipment suitable for long-line welding and laser energy control method Download PDFInfo
- Publication number
- CN113523552A CN113523552A CN202110883306.6A CN202110883306A CN113523552A CN 113523552 A CN113523552 A CN 113523552A CN 202110883306 A CN202110883306 A CN 202110883306A CN 113523552 A CN113523552 A CN 113523552A
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- laser
- welding
- energy
- infrared thermometer
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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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- 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
- B23K26/02—Positioning or observing the workpiece, e.g. with respect to the point of impact; Aligning, aiming or focusing the laser beam
- B23K26/06—Shaping the laser beam, e.g. by masks or multi-focusing
- B23K26/062—Shaping the laser beam, e.g. by masks or multi-focusing by direct control of the laser beam
- B23K26/0626—Energy control of the laser beam
-
- 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
- B23K26/70—Auxiliary operations or equipment
- B23K26/702—Auxiliary equipment
Abstract
The application relates to laser welding equipment suitable for long-line welding and a laser energy control method, and belongs to the field of laser soldering electronic packaging of printed circuit boards. The laser welding equipment consists of a laser, an infrared thermometer, a laser working platform and a laser control assembly, wherein the laser adopts a semiconductor laser. Meanwhile, an infrared thermometer is selected to detect the change of the laser power in real time on line, and the infrared thermometer is in a non-contact type and converts energy (heat) into an electric signal for processing. During welding, the infrared thermometer is aligned to a welding head, energy can be detected in real time during movement, the detected data signal is compared with the set laser power, and if the difference between the detected data signal and the set laser power is 5%, the laser is reset, so that the laser energy returns to the initial energy, and the influence of unstable energy on welding is eliminated. The laser welding system is simple and convenient to operate, can realize automation, can control the power of the welding process, and is easy to realize complex long-line welding.
Description
Technical Field
The invention belongs to the field of printed circuit board laser soldering electronic packaging, and particularly relates to laser welding equipment suitable for long-line welding and a laser energy control method.
Background
With the development of the electronics industry, electronic devices are gradually miniaturized and widely used in 5G, and three-dimensional assembly and optical-electrical interconnection modules are developed, wherein 5G optical communication modules comprise a plurality of heat-sensitive elements, and the heat-sensitive elements are degraded or even failed due to high temperature in a reflow soldering process. In addition, for example, the air tightness problem of a smartphone camera module, an optoelectronic product, a micro-electromechanical system and the like all need a welding mode of local heating to realize the three-dimensional packaging, so that the reflow soldering process of the integral heating mode is difficult to apply. The laser welding method has significant advantages over conventional welding methods, the main advantages including local heat input, non-contact and easy control, and excellent welding quality, while reducing thermal and mechanical stresses. With the continuous improvement of microelectronic packaging integration level and the continuous reduction of lead spacing, laser welding is widely applied to electronic packaging by virtue of the advantages of non-contact, local heating, rapid cooling and the like. At present, the spot welding and the direct pin welding are mostly applied in the field of laser welding PCBs, and the problem of laser power attenuation cannot occur in the short-time welding. The application of long-line welding is lacked, and the energy of the laser is easy to attenuate and unstable because the continuous output time of the laser can reach 60s during the long-line welding, so that the problems of adverse effect on welding, tin bead splashing and the like are caused.
At present, most of the PCB laser welding field is pin soldering tin, and the pin soldering tin is basically welded at one point through laser welding. In the case of long-line soldering, problems which do not occur in spot soldering, such as solder ball spattering and soldering unevenness, occur, which affect the signal transmission.
At present, parameters of heating equipment are generally directly adjusted for adjusting the welding temperature, and the adjustment mode can cause system deviation and is easy to generate temperature jump.
Disclosure of Invention
In view of the foregoing, the present invention is directed to addressing the deficiencies of the current field of laser long wire soldering of PCBs. A laser welding device and a laser energy control method suitable for long-line welding can improve the uniformity and the welding quality of the long-line welding. After the solder paste is printed, when the board is welded, an infrared thermometer is used for detecting and displaying the temperature in real time, when the board is dragged to be welded, if the temperature deviation is detected to be 5%, the laser is reset, the infrared thermometer sends a signal to the laser control assembly to enable the laser to reset to the initial power value, and the welding quality is prevented from being influenced by laser temperature fluctuation.
The application relates to laser welding equipment suitable for long-line welding, which comprises a laser, an infrared thermometer, a laser working platform and a laser control assembly; the laser is used for generating laser; the infrared thermometer is used for monitoring the change of the temperature of the laser welding part; the laser working platform provides support for the laser; the laser control assembly is electrically connected with the laser, the infrared thermometer and the laser working platform.
Furthermore, the laser is a semiconductor laser, the power is less than 80W, the wavelength is 920-940nm, and light can be continuously emitted.
Furthermore, the infrared thermometer is in a non-contact type and converts energy into an electric signal; the laser and the infrared thermometer share the same motion axis, and the positions can be synchronously adjusted; and the lens of the infrared thermometer is aligned with the welding position of the laser.
Furthermore, the infrared thermometer and the laser have the same alignment position of the cameras, so that the temperature change of the laser can be detected in real time on line.
Further, laser work platform includes mounting fixture, tank chain and CCD location camera.
Furthermore, the laser control assembly comprises a laser parameter control system, an infrared thermometer signal feedback system and a laser motion control system.
Further, the fixing clip has a fixing base and a driving portion that moves the fixing base.
On the other hand, the invention provides laser welding equipment suitable for long-line welding and a laser energy control method, which comprise the following steps: (1) the infrared thermometer detects the temperature of a welding part during drag welding, is aligned with the welding head, and can detect energy in real time during movement; (2) and comparing the detected data signal with the set laser power, and resetting the laser if the difference between the detected data signal and the set laser power is 5% so as to enable the laser energy to return to the initial energy.
Further, the initial energy is the energy generated during welding according to the set laser parameters.
The principle and the beneficial effects of the invention are as follows: a laser welding device and a laser energy control method suitable for long-line welding solve the problem of unstable power in the welding process and can improve the uniformity and the welding quality of the long-line welding. The laser control device comprises a laser, an infrared thermometer, a laser working platform and a laser control assembly. The laser control assembly comprises a laser control device, a laser signal sending device and a device for receiving signals of the infrared thermometer. The equipment manufactured by the method is compatible with the existing equipment, can be used only by simple modification, greatly reduces the cost, is simple to manufacture, can automatically complete the welding work, has good welding quality and uniformity, and obviously improves the production efficiency.
Drawings
Fig. 1 is a schematic view of a laser welding apparatus.
Reference numerals: 1-a laser; 2-a sports equipment tank chain; 3-a laser working platform; 4-an infrared thermometer; 5-laser control assembly.
Detailed Description
So that those skilled in the art can readily understand the principles and concepts of the invention, a more particular description of the invention, briefly summarized above, may be had by reference to the embodiments thereof that are illustrated in the appended drawings.
As shown in fig. 1: the laser 1 is used for generating laser light; the moving device tank chain 2 drives a fixed base of the laser 1 to slide in a translation mode, a sliding rod extends upwards from the fixed base, a sliding block sliding along the sliding rod is arranged on the sliding rod, a movement control device of the laser 1 is connected onto the sliding block, and a clamp used for fixing a PCB is arranged on the laser working platform 3; the infrared thermometer 4 is used for monitoring the change of the temperature of the laser welding part in real time, and the infrared thermometer 4 and the laser 1 share the same motion axis and can synchronously adjust the position; if the temperature of the laser welding part is detected to be not accordant with the initially set temperature, the infrared thermometer sends a signal to the laser control assembly 5, so that the laser is reset, the energy of the laser is kept stable, and the long-line welding quality is enabled to be uniform and consistent.
In another embodiment, the fixture for fixing the PCB on the laser working platform 3 has a rotation adjustment function, the CCD camera is used to record the image data of the welding position in real time to form a welding image data record, the data record with excellent welding quality is selected to form a standard welding image database, the laser control assembly 5 compares the welding image data collected by the CCD camera with the standard welding image database to determine whether there is welding point drift, if there is welding point drift, a control signal is sent to the adjustment assembly for fixing the fixture for fixing the PCB on the laser working platform 3, and the position of the PCB is adjusted to suppress the welding point drift. If the laser control assembly 5 judges that the difference degree between the real-time welding image data and the standard welding image data cannot be reduced to an acceptable range through laser resetting and/or position adjustment of the PCB, the welding is stopped, and a warning signal is sent to an operator.
While the present invention has been particularly shown and described with reference to the preferred embodiments, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (10)
1. A laser welding device suitable for long-line welding is characterized by comprising a laser, an infrared thermometer, a laser working platform and a laser control assembly;
the laser is used for generating laser; the infrared thermometer is used for monitoring the change of the temperature of the laser welding part; the laser working platform provides support for the laser; the laser control assembly is electrically connected with the laser, the infrared thermometer and the laser working platform.
2. The laser welding apparatus suitable for long wire bonding according to claim 1, wherein the laser is a semiconductor laser with a wavelength between 920nm and 980 nm.
3. The laser welding apparatus suitable for long wire welding according to claim 1, wherein the infrared thermometer is non-contact, converting energy into an electrical signal; the laser and the infrared thermometer share the same motion axis, and the positions can be synchronously adjusted; and the lens of the infrared thermometer is aligned with the welding position of the laser.
4. The laser welding apparatus suitable for long line welding according to claim 1, wherein the laser working platform includes a fixing jig, a tank chain, and a CCD positioning camera.
5. The laser welding apparatus suitable for long line welding according to claim 1, wherein the laser control assembly comprises a laser parameter control system, an infrared thermometer signal feedback system, and a laser motion control system.
6. The laser welding apparatus suitable for long wire welding according to claim 4, wherein the fixing clip has a fixing base and a driving portion that moves the fixing base.
7. The laser welding apparatus suitable for long wire welding according to claim 4, wherein the CCD positioning camera is connected with one end of the laser.
8. A laser energy control method of a laser welding apparatus, characterized by using the laser welding apparatus of any one of claims 1 to 7, comprising the steps of:
(1) the infrared thermometer detects the temperature of a welding part during drag welding, is aligned with the welding head, and can detect energy in real time during movement;
(2) and comparing the detected data signal with the set laser power, and resetting the laser if the difference between the detected data signal and the set laser power is 5% so as to enable the laser energy to return to the initial energy.
9. The laser energy control method of a laser welding apparatus according to claim 8, wherein the energy detection of the laser welding process is performed in real time on-line.
10. The laser energy control method of a laser welding apparatus according to claim 9, wherein the initial energy is an energy generated according to a set laser parameter during welding.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110883306.6A CN113523552A (en) | 2021-08-03 | 2021-08-03 | Laser welding equipment suitable for long-line welding and laser energy control method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110883306.6A CN113523552A (en) | 2021-08-03 | 2021-08-03 | Laser welding equipment suitable for long-line welding and laser energy control method |
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| Publication Number | Publication Date |
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| CN113523552A true CN113523552A (en) | 2021-10-22 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202110883306.6A Pending CN113523552A (en) | 2021-08-03 | 2021-08-03 | Laser welding equipment suitable for long-line welding and laser energy control method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114247998A (en) * | 2022-01-19 | 2022-03-29 | 浙江安胜科技股份有限公司 | Laser welding method based on automatic alignment device and device |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5681490A (en) * | 1995-09-18 | 1997-10-28 | Chang; Dale U. | Laser weld quality monitoring system |
| CN101774090A (en) * | 2009-12-25 | 2010-07-14 | 武汉凌云光电科技有限责任公司 | High-power semiconductor laser constant-temperature welding device |
| CN106424998A (en) * | 2016-08-31 | 2017-02-22 | 深圳市艾尔摩迪精密科技有限公司 | Automatic laser soldering system based on welding spot recognition |
| CN108213629A (en) * | 2018-01-22 | 2018-06-29 | 深圳市迈威测控技术有限公司 | Intelligent Laser tin soldering equipment |
| CN108620727A (en) * | 2018-04-28 | 2018-10-09 | 深圳市创鑫激光股份有限公司 | Working method, quasi-continuous laser, laser cutting and the welding system of laser |
| CN110340516A (en) * | 2019-06-21 | 2019-10-18 | 苏州市长峰激光技术有限公司 | A kind of laser process equipment and processing method based on temperature detection |
| CN111086221A (en) * | 2020-03-19 | 2020-05-01 | 欧声焊接科技(常州)有限公司 | Laser welding control system and method |
-
2021
- 2021-08-03 CN CN202110883306.6A patent/CN113523552A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5681490A (en) * | 1995-09-18 | 1997-10-28 | Chang; Dale U. | Laser weld quality monitoring system |
| CN101774090A (en) * | 2009-12-25 | 2010-07-14 | 武汉凌云光电科技有限责任公司 | High-power semiconductor laser constant-temperature welding device |
| CN106424998A (en) * | 2016-08-31 | 2017-02-22 | 深圳市艾尔摩迪精密科技有限公司 | Automatic laser soldering system based on welding spot recognition |
| CN108213629A (en) * | 2018-01-22 | 2018-06-29 | 深圳市迈威测控技术有限公司 | Intelligent Laser tin soldering equipment |
| CN108620727A (en) * | 2018-04-28 | 2018-10-09 | 深圳市创鑫激光股份有限公司 | Working method, quasi-continuous laser, laser cutting and the welding system of laser |
| CN110340516A (en) * | 2019-06-21 | 2019-10-18 | 苏州市长峰激光技术有限公司 | A kind of laser process equipment and processing method based on temperature detection |
| CN111086221A (en) * | 2020-03-19 | 2020-05-01 | 欧声焊接科技(常州)有限公司 | Laser welding control system and method |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114247998A (en) * | 2022-01-19 | 2022-03-29 | 浙江安胜科技股份有限公司 | Laser welding method based on automatic alignment device and device |
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Application publication date: 20211022 |
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