Laser – “the fastest knife”, “the most accurate ruler”, “the brightest light”

Since the 20th century, laser is a major human invention after nuclear energy, computer and semiconductor. It can be used to process all kinds of materials. In recent years, the “fastest knife”, “the most accurate ruler” and the “brightest light” have galloped all the way at the speed of “light” with her soft and magical energy, which has renewed the vitality and vitality of countless industries and enabled the traditional manufacturing industry to a great extent.

Machine vision technology — the extension of human eyes on machines

Machine vision technology involves artificial intelligence, neurobiology, computer science, image processing, pattern recognition and many other fields. It is not only a simple extension of the human eye, but also has part of the functions of the human brain – extracting information, processing and understanding from the images of objective things, and finally used for practical detection, measurement and control.

Machine vision has the characteristics of precision, efficiency, flexibility and repeatable operation. In the field of laser processing, machine vision can realize real-time observation of processing objects and use cameras to obtain image information, which improves the processing flexibility, high resolution, operation accuracy and greatly increases the production efficiency. At the same time, based on the image processing of the processing object, the complex processing technology can be realized, and the laser processing with high repetition can be carried out due to machine vision, which avoids the fatigue and errors caused by repeated operations and reduces the requirements for personnel.

2021 South China advanced laser and processing application technology exhibition will land in hall 9 of Shenzhen International Convention and Exhibition Center (Bao’an new hall) from October 28 to 30. It is worth mentioning that this South China laser exhibition will be held at the same time as China (Shenzhen) Machine Vision Exhibition – visionchina (Shenzhen) 2021. The exhibition will be linked with laser and system accessories, machine vision and automation manufacturers to provide optimized technical solutions for downstream equipment integrators and application customers.

Seize new opportunities in industry 4.0:

Laser processing and machine vision will usher in the golden period of industry development

Compared with traditional processing technology, laser processing technology has the advantages of less material waste, obvious cost effect in large-scale production and strong adaptability to processing objects. Generally speaking, machine vision is the “eye” of the machine. It is the visual organ of the machine to perceive the world and interact with the external world, so as to realize automation and intelligence. Therefore, machine vision is also known as “the core technology of artificial intelligence in the future”.

For example, in the field of electronic manufacturing, from small capacitors, connectors and other components to mobile phone keyboard, PC motherboard and hard disk, machine vision system can be seen in almost all links of the electronic manufacturing industry chain. As a large manufacturing country, China has concentrated 70% of the global production capacity of 3C products. 3C electronics industry is one of the most important pillar industries and has undoubtedly become the key market of machine vision application projects. As a new processing tool, laser has long found great use in 3C industry and its application territory is expanding day by day.

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Figure. China’s laser industry is developing at a high growth rate (Statistics of the Special Committee on laser processing)

With the structural adjustment, transformation and upgrading of China’s traditional manufacturing industry, high-end, precision, automation and intelligence are the new trend of manufacturing development. In 2020, according to the statistics of the Special Committee on laser processing, the output value of China’s domestic laser processing equipment industry was 68 billion, an increase of 18% over the previous year. Driven by favorable policies, the domestic machine vision industry is developing rapidly. China is becoming one of the most active regions in the world. It is expected that the scale of China’s machine vision market will reach 24.6 billion yuan by 2025. It can be predicted that in the industrial 4.0 period, laser processing and machine vision technology will usher in the golden period of industry development because of its high-end, precision, intelligence and many other characteristics.

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Figure. Market scale forecast of China’s machine vision industry from 2020 to 2025 (unit: 100 million yuan)

Source: Research Institute of prospective industry @ prospective economist app

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Cross border integration of laser processing technology and machine vision technology

In recent years, with the continuous development of laser processing equipment and the continuous improvement of its intelligence, more and more laser processing systems use machine vision function to further improve processing efficiency and quality, which can be divided into the following categories:

01、Laser semiconductor wafer cutting

Laser fine processing equipment, such as UV laser semiconductor wafer cutting equipment, mainly accurately locate the position of the processed workpiece through image automatic recognition processing and positioning functions. It can also automatically judge the relative position of the required machining point on the workpiece according to the image. Compared with human vision, it has higher resolution and higher positioning accuracy. Therefore, the machining accuracy of the equipment can be further improved while mechanical positioning.

02、Laser flexible material cutting

It is characterized by the use of machine vision image recognition and positioning technology, which can automatically track and compensate the tensile deformation of flexible materials in the whole process, accurately capture the edge of the cut object in real time, and transfer the edge information of the image as position vector information to the control system of laser cutting equipment according to the requirements, so as to realize automatic edge finding and accurate cutting of the target.

03、Laser marking

The laser marking equipment with machine vision function can automatically align and adjust the position and angle of the marking image by analyzing and identifying the position and angle of the marked object. Machine vision guided positioning aims at the fragile material, small target size, high positioning accuracy and continuous mass marking operation, which can greatly improve the production efficiency and ensure the consistency of product quality. At the same time, when placing the marking sample, there is no need for a special mechanical positioning device. Even if there is a certain offset, it has no impact. After automatically proofreading the image, it can also be marked at the original position ready for marking, so as to improve the marking quality, yield and work efficiency, and make the marking more convenient and accurate.

04、Laser drilling

In addition to automatic positioning and tracking of workpieces and automatic drilling, the laser drilling equipment using machine vision can also detect holes of various shapes (such as semicircular holes, crosshairs, square holes, etc.), and the processing and detection can be completed at the same time, which can improve the production efficiency. It is widely used in PCB drilling, plastic film drilling, label paper drilling and other fields.

05、Laser tire online marking

The laser on-line marking of tire is realized by using machine vision and image processing technology. The system is mainly composed of laser, scanner, workbench, optical lens, CCD sensor, image acquisition card and image processing software. Using machine vision and image processing technology, the control system can automatically distinguish the marking position on the assembly line, adjust the beam deflection and automatically adjust the focal length for marking according to the image information processed by the computer, Accurately and real-time capture the information of the inner edge of the tire, read the tire code, and mark the target.

06、Laser micromachining

Laser micromachining includes fine machining methods such as engraving and resistance adjustment, which will produce large errors in human eye judgment. Machine vision can clearly locate the processing area and guide the laser to work, so as to reduce and eliminate errors as much as possible. The introduction of machine vision technology into the laser processing industry effectively improves the accuracy, intelligence and automation performance of laser processing equipment, and meets the quality requirements of mass and large-scale production in modern industry.

In order to better realize the integration of laser processing and machine vision in South China, 2021 South China advanced laser and processing application technology exhibition will fully cover the exhibition scope of laser processing, advanced light source, advanced laser, etc. Visionchina (Shenzhen) focuses on the core components and accessories of machine vision, cooperates with high-quality industrial enterprises, integrates top-level advantageous resources, and creates a new cross-border cooperation platform between laser processing and machine vision in hall 9 of Shenzhen International Convention and Exhibition Center.

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