Welding temperature closed-loop control type laser soldering tin machine

Abstract

The invention relates to the field of laser soldering tin machines, in particular to a welding temperature closed-loop control type laser soldering tin machine. The welding temperature closed-loop control type laser soldering tin machine comprises a temperature control welding device, a sensitive resistor, a data acquisition card, an industrial PC, a laser control card and a laser device. The temperature control welding device generates 808 nano lasers through the laser device so as to weld PCB machined parts. The temperatures of soldering tin points on the PCB machined parts are measured in real time, measured temperature signals are converted into 4-20MA analog signals to be output to the sensitive resistor, and voltages are generated on the sensitive resistor. The data acquisition cardcollects voltage data generated on the sensitive resistor, and the voltage data are further transmitted to the industrial PC. The industrial PC calculates the real-time temperature according to the voltage data, and the laser control card can be controlled to output the analog quantity of 0-5V. The laser device changes the magnitude of laser currents according to the received analog quantity of 0-5V. Compared with the prior art, the welding temperature closed-loop control type laser soldering tin machine can achieve welding temperature closed-loop control, stability is improved and good production quality is guaranteed.

Description

【Technical field】 [0001] The invention relates to the field of laser soldering machines, in particular to a laser soldering machine with closed-loop control of welding temperature. 【Background technique】 [0002] Most of the soldering processes currently on the market use soldering irons to send tin wires. This process belongs to contact soldering, which has stress contact with the PCB board. It has a large heating area, high heating temperature, and long soldering time, which is easy to damage the product. It has a short service life and high energy consumption. It is a consumable product, and it cannot achieve fixed-point, quantitative, timing, and precise control. With the continuous development and progress of technology, electronic products are becoming more and more integrated and smaller. , Soldering iron soldering in many places can no longer be used. [0003] So laser welding came into being. Laser welding belongs to non-contact welding and stress-free contact. It ...

AI Technical Summary

Problems solved by technology

[0002] Most of the soldering processes currently on the market use soldering irons to send tin wires. This process belongs to contact soldering, which has stress contact with the PCB board. It has a large heating area, high heating temperature, and long soldering time, which is easy to damage the product. It has a short service life and high energy consumption. It is a consumable product, and it cannot achieve fixed-point, quantitative, timing, and precise control. With the continuous development and progress of technology, electronic products are becoming more and more integrated and smaller. , soldering iron soldering in many places can no longer be used

[0003] So laser welding came into being. Laser welding belongs to non-contact welding and stress-free contact. It uses laser to generate specific pulsed laser to locally heat the material in a small area, and then diffuses to the inside of the material through heat conduction to form The specific pad realizes the laser soldering of the processed parts, completes the precision soldering that cannot be achieved by the soldering iron wire feeding welding process, and greatly improves the yield rate of the product, but the laser welding time is ultra-short, which has great influence on the control of laser power. High requirements, its welding speed and temperature are difficult to control

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