Laser is known as the brightest light, the fastest knife, the most accurate ruler, in the 20th century, the laser industry into a rapid development stage, picoseconds, femtoseconds and other ultra-fast lasers came into being, with the rapid development of China's equipment manufacturing industry, the development of the laser industry is also stepping up to a new level, in the large-scale manufacturing industry (such as automotive, aviation, shipbuilding and other industries), as well as precision machining industry (such as 3C electronics, semiconductors, medical industry), laser processing technology to follow the development of the times, market demand has set off a wave of innovation of traditional processes. ), laser processing technology to follow the development of the times, market demand set off a wave of innovation of traditional processes.
After the emergence of the new crown epidemic in 2020, a large number of medical enterprises to vigorously increase production and capacity expansion, the new crown antigen reagent card testing demand has increased dramatically. In this regard, medical enterprises are in urgent need of more efficient processing methods to improve production efficiency and reduce labor costs.
Flying Laser Marking Technology
Traditional flying laser marking is a dynamic marking method different from static marking, which is to quickly mark the workpiece on the assembly line under the movement of the assembly line (hereinafter referred to as "flying marking"). This process not only can greatly improve the efficiency of work, but also based on the assembly line way of working, more convenient for factory automation integration. At present, flying marking has been widely used in food, medical, 3C electronics and other industries.
However, limited by the motion of the assembly line cumulative error and sensor response time error, conventional flight marking laser engraving accuracy is often more than 1-2mm; in addition, due to the inability to obtain the incoming material angle data, resulting in bad consistency of laser engraving of the product, the traditional positioning of the CCD can not be matched with the application of flight marking, the above two points lead to the traditional flight marking technology is only suitable for the more sloppy laser applications. When customers have higher requirements for efficiency and accuracy, such as the medical industry POCT reagent test card laser engraving, how to configure efficient and high precision flying camera flight marking is particularly important.
The "flying camera flight marking technology" is the introduction of dynamic machine vision system in the front end of the traditional flying marking, through the vision camera to take pictures of the dynamic workpiece positioning in advance, to obtain the accurate coordinates of each workpiece, and the coordinates will be loaded into the laser engraving system in turn, so as to realize the accurate and efficient laser engraving. Advantages of this technology: firstly, it inherits the advantages of high efficiency and high automation degree of traditional flight marking; secondly, the precision of laser engraving is improved to within ±0.1mm, which can meet the needs of various precision processing in more industries; once again, the automatic double-checking rejection function derived from flight marking further saves manpower, and greatly improves the product shipment rate and yield, at present, the yield rate of laser engraving reached 99.8% in the case of POCT reagent card, for example. At present, the yield rate of laser engraving reagent card, for example, reaches more than 99.8%. In addition, as another brand-new technology combining machine vision and laser, its originality, adaptability, high efficiency and expandability determine that this technology will have a vigorous vitality in the field of laser equipment in the future, and it will surely show its strong competitiveness in the future docking of injection molding machines, paging machines and other orderly incoming occasions.
The improvement of laser engraving accuracy of the flying laser engraving system is due to the following two technological breakthroughs: flying camera technology and assembly line meter counting technology.
Flying camera technology means that the camera takes pictures during the movement of the object, the object does not need to stay, and the visual calculation of the object's position coordinates is transmitted to the laser engraving system. Flying camera technology is a kind of high speed, high efficiency, high precision visual positioning technology, is the flying camera flying marking laser engraving system to improve the processing accuracy of the most critical technology.
The assembly line meter counting technology that is through the meter counting wheel to calculate the movement distance of the assembly line, to ensure that each movement of the workpiece to the set fixed distance when the trigger laser engraving, which can greatly make up for the belt line movement speed fluctuations caused by the precision error. Flying shooting technology and meter counting technology complement each other, realizing the improvement of processing accuracy of flying shooting flying marking laser engraving system.
On the basis of improving efficiency and precision, the flying laser engraving system adopts a modularized design, which includes several modules, including assembly line conveyor, visual positioning mechanism, laser engraving mechanism, double-checking and rejecting mechanism, and intelligent control software. Customers can freely choose and match according to their needs, and the current common configuration is two sets of positioning cameras + four sets of laser heads + three sets of double-checking cameras, which can process four rows of materials at the same time. This set of configuration has been widely used in the medical industry POCT new crown antigen detection reagent card two-dimensional code information laser engraving, in the injection molding machine with automatic loading, four laser head total UPH about 16,000pcs, the daily production capacity of more than 300,000, for the epidemic period of antigen reagent card to protect the needs of the supply of providing a strong boost.
Conclusion
Flying shooting flight marking technology is a small step in the technical exploration of the field of laser equipment, solving the customer's pain point problem of efficiency and precision do not go hand in hand, but also for the fight against the new crown dedication of their own strength. Good technology, good products, good market is the pursuit of our laser practitioners, the subsequent good technology and product iteration, for customers to speed up production capacity, to create value for customers, will become the continued momentum of Huagong Laser.
