Virtual flexible manufacturing system simulation research (2)
The geometric model is a description of the shape characteristics of the physical device. It expresses the basic shape information of the physical device, such as the shape of the machine bed, the table and the spindle. These geometric models are controlled by the motion control model according to the external input. The control data is used for corresponding movements, which can be expressed as the actual behavior of the physical equipment, such as the feed of the work, the rotation of the main shaft, the behavior of the robot, and the movement of the material trolley.
The geometric modeling of the virtual device first takes the form of three-dimensional modeling such as Pro-E, UG or Solidworks, and decomposes each physical device into functional module parts. For example, the lathe can be decomposed into: bed, tool holder, spindle, tip, machine door Etc. Then, by transforming into an OPENGL-based simulation environment, the exact coordinates in the model are obtained, and a virtual machining lathe is obtained according to the homogeneous coordinate transformation relationship. Others such as milling machines, robots, stereo warehouses, pallets, etc. can be carried out in this way.
The motion control model reflects various control functions of the physical device. It processes, judges, and outputs corresponding control information according to the externally input control information, drives the position and motion state changes of the relevant geometric model, and realizes the behavior of the physical model device. Virtualization. According to the motion properties of each physical device, the corresponding motion system is established. Each processing device performs motion planning strictly according to the numerical control principle, and determines the machining coordinate system, machine tool origin and machining origin. According to the principle of CNC interpolation, the step length and the end position of the machining are determined, and the arc, line and parabolic interpolation algorithms are programmed according to different NC machining codes. The motion of each component is clock-triggered. This clock can be defined according to the number of control motions and coordinated with each other according to the completed functional properties. For the processing equipment, it can control the speed of the spindle, the positive and negative rotation, the single-axis motion and the multi-axis linkage, the tool change, etc. The clock between the conveying equipment, the robot and the taking device and the conveying device must be strictly controlled according to the working schedule. .
This study combines the functional and behavioral characteristics of each component of FMS into the component model, introduces it with a visual 3D model, uses Opengl as the model 3D driving engine, and combines the machining process simulation to form a virtual machine tool with real natural performance attributes. , virtual artifacts, virtual robots, and more.
3 Research on virtual flexible system layout and 3D visualization of work process based on process engineering
Aiming at the layout flexibility of flexible manufacturing systems, a system for randomly arranging virtual devices is planned. In this system, virtual devices are virtual device component objects modeled according to function and behavior attributes, and according to the specific layout position and orientation of these objects. Corresponding production material transportation system, establish virtual material transportation line, virtual solid warehouse, virtual pallet, virtual stacker, etc.
In order to obtain a satisfactory overall model and simulation effect of the virtual flexible manufacturing system processing simulation, a multi-clock binding technology is adopted. According to the process, complex logic planning is performed on the clocks of each part of the action model, and the process of the root process model is used to trigger and stop different clocks to adapt to the motion simulation effect of the flexible manufacturing system.
At the same time, each virtual device can define itself as white. Work mode, work process and method. For example, for the milling center, the tool path can be obtained according to the NC machining interpolation to form the NC code, and then the machining process simulation. All process data attached to the virtual device, such as scheduling instructions, NC code, etc., are customized to a certain protocol, and matched according to this protocol to obtain the control effect of guiding the motion simulation.
The research makes full use of computer simulation, visualization, motion modeling and motion simulation, data decoding and other technologies to combine the flexibility of virtual flexible manufacturing system planning and the effectiveness of functional simulation to form a different way in a visual way. The product can be manufactured in different flexible manufacturing system environments. Users can evaluate the equipment and layout methods used on this basis, and evaluate and compare them to obtain a satisfactory product manufacturing model to achieve virtual manufacturing. Part of the purpose.
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