It is important to note that due to the large number of moving mechanisms on the entire press line, the entire press line motion system must be decomposed into many subsystems. Each subsystem must have one part fixed to the ground surface, and other parts The parts constitute various motion constraints, making the subsystem a space moving member whose freedom should be greater than zero and equal to the number of originals, which can be checked by CATIA's Mechanism Analysis. When all subsystems pass the inspection, the final combination is the press line assembly simulation.
In order to move the virtual press line, it is also necessary to give the movable mechanism a motion law consistent with the actual working condition. This can be driven by the Kinematics module to add a command operation to the press line motion mechanism, including the time of each motion degree of freedom movement, the position change of the motion, and so on. For more complex motion laws, the Laws and Speed-Accelerations options can be added for further detailed description to make the motion law closer to the actual working conditions.
The Play a Simulation function interface in the CATIA Real Time Rendering environment visualizes the entire assembly process of each part driven by the program. Figure 5 is a scenario of the simplified model simulation running process of the assembled press line.
3. Verification of virtual assembly results
The virtual assembly process is implemented on a computer. Virtual reality is a kind of mapping from the real process to the computer, which intuitively simulates the real process. A forward-looking prediction of the real process through virtual reality.
The main purpose of establishing a virtual press line is to perform a feasibility analysis of the assembly plan before the actual press line assembly. Therefore, the verification of the virtual assembly result, that is, the motion interference check between the constituent units of the press line, is the main content of the virtual press line simulation operation.
The components of the virtual press line are driven by the set motion law. If there is interference between the motion units of the press line during the running, the software will issue a warning and express the interference in a conspicuous color.
If there is no motion interference between the components in the simulation operation, the virtual press line assembly result is verified, and the overall assembly scheme of the press line is output, waiting for the arrival of the next press line assembly task.
Conclusion
In this paper, based on the virtual assembly technology, on the basis of establishing the model library of the automobile body press line, the original physical model pre-assembly is replaced by the simulation verification of the running process of the virtual press line assembly. The press line assembly personnel realize the rational planning of the assembly line of the press line by means of virtual assembly, which can effectively improve the assembly process of the press line, and has important theory and theory for shortening the assembly cycle of the press line, improving the assembly quality of the press line, and reducing the assembly cost of the press line. Realistic meaning.
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