Research and application of palletizing technology in post process of high speed stamping production line

With the development of sheet metal stamping industry, high-speed stamping line has been widely used. Due to the high beat, many kinds of products and large volume of parts, palletizing in the later process is basically realized by manual palletizing, which restricts the improvement of the overall automation level. At the same time, the “high noise” environment has become a typical environment for employees. In view of this situation, the project team combined with the actual production, from the part structure analysis, took the lead in the breakthrough of the top cover parts, and solved the problem of automatic palletizing. Taking the top cover of air conditioner as an example, this paper introduces the research and application of palletizing technology in the post process of high-speed stamping production line.
Bottleneck of traditional scheme
Characteristics of high speed stamping production line
(1) the large tonnage press can meet the production of various varieties and large volume parts, and the coverage rate of parts is high.
(2) high speed production rhythm can improve stamping efficiency to 16-20 times / min.
Difficulties in developing automatic palletizing
(1) the combination of straight coordinate manipulator and tooling positioning table (Fig. 1) is adopted. Due to the structure and program defects of the manipulator, the program can not be changed with the change of the stacking height of the parts, and the range and height of the picking can not adapt to multiple roof size switching. The beat can only meet the ordinary punching line, and stacking can not be realized at the beat of 20 times / min.
Figure 1 Robot palletizing
(2) with the combination of robot with feeding belt line and tooling positioning table (Fig. 2), the problem of sliding with suction cup due to excessive amount of raw oil can not be placed accurately. Stacking starts from about 15 layers, which has a direct impact on robot palletizing. To meet the palletizing of high-speed production line, multiple robots need to be configured, which is difficult to carry out in limited space.
Figure 2 robot palletizing
Research and analysis of project scheme
Overview of the scheme
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Breakthrough in difficulties
(1) the robot can’t reduce the speed when its stacking time is consistent with the line’s.
Solution: through the stacking aggregate device, using multiple stacking, one-time grasping and discharging mode.
Innovative automatic slide stacking technology (Fig. 3), parts arrive at the slide position through the front-end adjustable guide conveyor line, and automatically collect and stack the workpiece by using the self weight of the part, so as to solve the problem that the stacking cannot be directly carried out under the fast beat, and the fast beat is successfully converted into the slow beat operation.
Figure 3 design and application of slide mechanism
(2) robot palletizing requires universal parts of various sizes and specifications, so the universality of fixture must be considered.
Solution: servo clamping, self-adaptive part size, no need for manual adjustment, to achieve robot on-line real-time grasp.
Because of the high speed stamping line, the beat can reach 20 Times / min, the conventional mechanism can not achieve fast palletizing, and palletizing can be realized through slideway and self overlapping placement. Then, the robot adaptive fixture is used to take the whole material code and put it into the tool box to solve the problem of balance between stamping and palletizing beat, instead of manual palletizing. The customized tooling can meet the requirements of various roof cages, and realize the standardization of tooling and the generalization of line body.
Working principle and process
See Figure 5 for palletizing scheme design and site scheme implementation.
(1) the high-speed production line outputs the parts through the conveyor line, which is equipped with adjustable guiding mechanism, which is suitable for various parts transportation.
Figure 4 design and application of clamping mechanism
(2) the parts are transported along the guide mechanism, and slide into the corresponding aggregate device, and fall on the elevator bracket. Each time the material passes, the elevator lowers the set height of the corresponding parts.
Figure 5 palletizing scheme design and site scheme implementation
(3) after the bracket has collected a certain number of parts (16-24 pieces), it will be pushed into the tooling platform, and the cylinder on the mobile platform will work and be pushed to the position where the robot grabs materials.
(4) after receiving the signal, the robot grabs the materials on the tooling platform and puts them on the empty tooling tray.
(5) when the pallets on one side finish palletizing, the robot starts palletizing on the other side.
Conclusion
At present, the post process palletizing is more common in the industry, but it is always difficult to break through due to the difficulty in implementation and many difficulties in the high-speed stamping production line. Through continuous exploration and experiment, the project team gradually completed this set of mature institutions. The unique beat transformation technology and stack shape and grasp size adaptive technology in the project gather the wisdom of all team members, create a good working environment and work experience for customers, promote the intelligent manufacturing process of the industry, and set a benchmark for the industry, which has reference significance for the industry colleagues.