Up and Bottom Cover has a simple structure and a large proportion of patterning. In actual production, it is easy to form standardization, so as to realize automatic production and reduce costs. Compared with folding boxes and book-shaped boxes with more complicated processes, it has incomparable advantages.
In the production of Up and Bottom Cover, the paper is made into face paper of the same size and shape through the steps of die-cutting and lamination; the gray paper is also cut into the same size and shape through the steps of die-cutting, grooving, and corner sticking, and then it is combined with The tissue paper is laminated, and this series of processes can be fully automated.
▲The lamination process of Up and Bottom Cover production
From the whole lamination process, it can be seen that the paper feeding and gluing in the early stage, and the grabbing and forming in the later stage are all mature technologies. To achieve high speed and high precision, visual positioning is the key.
In this regard, Ad-tech has launched a high-precision AVS visual positioning system for sky and earth covers, and equipped with Ad-tech SCARA robot AR4215, which can greatly improve the positioning accuracy and production efficiency of sky and ground covers during automatic lamination. In addition, the system is easy to operate. In the human-computer interaction interface, the user can quickly switch the visual template and fine-tune the compensation value of the fitting position.
Due to the limitation of the previous process, the right angle of the semi-finished box will have burrs and deformation, and the paper has different aspect ratios and unevenness, which seriously affects the accuracy of lamination. In addition, the same equipment cannot ensure the fitting accuracy of different specifications of heaven and earth boxes.
At present, the commonly used visual solution in the industry is to find the diagonal corners of the paper and the box to determine the center point. However, due to the above adverse conditions, the required center point is offset, which seriously affects the lamination accuracy of the tissue paper and the semi-finished box.
In response to the above difficulties, Zhongweixing AVS vision system launched a measurement-based positioning solution for the sky and ground cover, including two methods:
① Measurement method: The positioning of the paper and the box is completed by measuring the long side A corner and the short side B and C corners;
② Corner extraction method: By extracting the corners of the cutting corners of the surface paper, the positioning of the surface paper is completed.
These two methods can respectively solve the different aspect ratios of paper and the deformation of right-angle edges, ensure the consistency of incoming materials, and then complete the correction of position and angle. In cooperation with Ad-tech SCARA robot AR4215, the paper and box can be accurately attached to each other. Together, the final accuracy reaches ±0.1mm.
During the production process, due to mechanical shaking, the effect of the box will be offset. The common practice is to pause the robot and then manually modify the compensation values in the x, y, and c directions. This method will affect the production efficiency and is not easy to operate.
Combined with SCARA robot, AVS vision software has developed a robot control function, which realizes human-machine interaction. Various schemes can be configured according to the specifications of the box and tissue paper to realize one-to-one configuration; the compensation value can be adjusted on the human-machine interface. .
Finally, we conclude:
Program overview
Adopting four-camera positioning, the robot has a perfect visual calibration method, and the final accuracy reaches ±0.1mm;
· It can detect right-angle deformation of semi-finished boxes, burrs, different aspect ratios of paper, and poor incoming materials;
· Human-computer interaction interface is friendly, and it is convenient and simple to switch products;
· Simple debugging, convenient automatic calibration, only 5 minutes to complete a calibration.
