Simulation Research on Virtual Flexible Manufacturing System

The mechanical manufacturing system is a complex system that inputs manufacturing-related materials, equipment, tools, energy, personnel, manufacturing theory, manufacturing processes, and manufacturing information. The output is a qualified product with certain functions. The complexity of manufacturing systems is manifested in the manufacturing environment, the manufacturing of products, and the complexity of the manufacturing system structure and manufacturing process. In the face of such a complex system, in order to make the product reach the optimal TQCS, it is necessary to strictly control all aspects of manufacturing, and obtain local optimal and even global optimal goals. All of this requires modeling the entire manufacturing process. One of the hot spots of current research is virtual manufacturing technology.

Flexible Manufacturing System (FMS) is an automated manufacturing system consisting of CNC machining equipment, material storage and computer control systems, including CNC machine tools, machining centers, turning centers, etc., and may also be flexible manufacturing units. It can be quickly adjusted according to changes in manufacturing tasks or production environments. To use virtual manufacturing technology to correctly simulate the manufacturing process of a flexible manufacturing system, two main tasks are to first simulate the function of the processing equipment in the manufacturing system: Second, the entire flexible manufacturing system is correct on the basis of "one". Plan the production process to obtain a comprehensive assessment of the manufacturability of the entire product.

The “Virtual Flexible Manufacturing System System Simulation Research” project was supported by the Science and Technology Development Fund of Southwest Jiaotong University from May 2003 to May 2005. The project takes the flexible manufacturing system as the prototype research object. From the perspective of system theory, the virtual flexible manufacturing system is theoretically modeled according to the viewpoint of complex system, and the key technology of virtual flexible manufacturing system simulation is studied. Focus on process information modeling of process, process system geometry modeling, motion modeling and physical effect modeling, and plan motion simulation, NC code inspection and tool path simulation for machining process. In this way, the evaluation factors and mechanism of the machinability of parts are studied, and an optimization model of process evaluation is established. The ultimate goal is to establish a virtual reality-based visual manufacturing evaluation system that can evaluate process plans and process parameters to resolve the contradictory relationship between the manufacturing system and the product market.

After two years of research, the project has achieved the expected results or identifiable technical performance indicators.

1 Proposed component-based virtual flexible manufacturing system modeling theory and method

The flexible manufacturing system generally includes two types of motions of different natures, one is the information flow of the system, and the other is the material flow of the system, and the material flow is controlled by the information flow. FMS automates material flow and information flow based on process automation. For flexible manufacturing system planning, we must first rationally plan and arrange various physical equipment components according to the assignment of tasks, or the flow of information flow. Due to the variety of physical device types, reusability, and the interactivity of processing information flows between physical devices, it is more natural-object-oriented and can be expressed based on object-oriented components. Each component is an instantiation of an object. They have their own properties and behaviors. The interaction process that the component can provide with the outside world is the process of interacting and passing information flows between physical devices. In a typical flexible manufacturing system, these components are: CNC lathe objects, CNC milling machine objects, machining centers, robot objects, stacker objects, solid warehouse objects, handling trolley objects, conveyor objects, and the like. Each object is modeled according to the behavior and properties of each physical device, including 3D modeling, motion control modeling, and attribute modeling.

The study uses the natural object description method to theoretically plan the relationship between the components in the virtual FMS system, which provides a methodological basis for the subsequent functional modeling.

2 Proposed component function and behavior modeling method based on 3D model

The virtual manufacturing environment consists of corresponding virtual manufacturing devices. Each virtual device is equivalent to a component. The component should be able to reflect the characteristics of the physical device more completely, such as the geometric characteristics, material characteristics, and motion information of the physical device. Therefore, it must be digitized according to the characteristics of the real device to establish a virtual device model.

The virtual device model is a mapping of information about physical device functional features and shape features in a virtual environment. The functional specificity of the physical device determines the geometric properties of the virtual device model. Therefore, when constructing the virtual device model, you can start from the geometric model and the motion control separately, and analyze the functional characteristics and geometric features of the physical device. The equipment model is divided into two parts: the geometric model and the motion control model.

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