Four doors and two covers (left and right front door, rear door, engine cover, trunk cover or back door) are important parts of automobile body assembly. They are the exterior opening parts of the car body. After assembly, they should maintain a uniform assembly clearance with the surrounding parts to achieve good interchangeability. At the same time, they are also the visible surfaces of the car molding. Therefore, it is required that the outer surface of the door and cover be smooth and flat, without concave and convex scratches, and that the edge transition line be smooth. Based on the above requirements, the welding process shall not be adopted for the assembly between the inner and outer plates of four doors and two covers, but the edge wrapping process shall be adopted.
The so-called edge wrapping process is an assembly process (by bending) that makes the inner and outer plates of the parts connected together after the upper or lower flanging generated by stamping on the parts are flattened. There are press + upper and lower die (press) and table top in the traditional edge banding process, but the disadvantages of the above methods are poor flexibility, which can only be applied to one vehicle type, and high manufacturing and maintenance costs. Therefore, with the improvement of industrial automation, robot roller hemming is also introduced into the edge wrapping process. The so-called robot edge rolling refers to the manufacturing process of the industrial robot introduced into the edge rolling operation and the roller installed on the robot arm for edge rolling. The advantage of robot edge rolling lies in its high flexibility, which is suitable for several types of vehicles, maximizes the utilization rate of the equipment and reduces the cost.
General robot edge rolling system includes the following parts:
Robot: select the robot according to the rolling load.
Rolling head: select one or two types to install on the robot as required. When the robot moves, it completes the rolling of the opening part. The roller on the roller head is designed according to the characteristics of the product.
Mold: the inner plate and outer plate of the opening part shall be reliably positioned. The tread will be machined according to the digital definition of stamping (dfnie).
Positioning fixture: after the inner plate and outer plate are assembled, they are transported to this station by other stations. Positioning fixture is an important part to ensure the quality of edge rolling.
Inner and outer plate: the outer plate of the opening part is fully fitted with the tire mold, and the relative position relationship between the inner plate and the outer plate is guaranteed by the positioning fixture.
