異形螺桿的虛擬數(shù)控車削加工研究
[Abstract]:As a kind of common industrial machinery parts, screw is widely used in compressors, freezers, screw pumps, rubber and plastic machinery, food expansion machines and oil screw drilling tools and other mechanical products. As the core component of these products, the screw is generally used in the processing of raw materials, feeding and other processes, its processing quality and accuracy are closely related to the working efficiency of this kind of mechanical products. Due to the different purpose of application, the application range of special-shaped screw is expanding, the demand is increasing rapidly, and the screw form is complex and diverse, all of these bring great difficulty to the processing and manufacturing of special-shaped screw. For the processing of special-shaped screw, milling method is widely used in the world, but this machining method has some shortcomings, such as low precision and high cost. The machining accuracy depends entirely on the experience and technical level of the operator, and the quality fluctuates greatly. Therefore, it is necessary to study the numerical control lathe for special-shaped screw. In view of the above problems, this paper compares and analyzes several commonly used geometric modeling methods, selects the method based on the unit to discretize the 3D modeling of the blank, and proposes a simplified data storage method. Combined with the mathematical model of special-shaped screw, the algorithm of material removal between cutter and workpiece is deduced, and the equal residual height method is used to calculate the walking step, so that the number of cutter walking can be determined automatically. According to the mathematical model and strain condition of chip, the parameterized construction method and breaking condition of chip model in the system are determined. Then the AABB bounding box is used to detect the rough collision, which can effectively eliminate the collision, and then use the fine collision detection method between the planes to realize the fast and effective collision detection. In order to achieve the purpose of testing the processing parameters of special-shaped screw. Finally, using C # programming language and OpenGL 3D graphics library function, a special shape screw virtual NC turning system is developed in Visual Studio environment, which includes parameter input, tool setting, workpiece setting, collision detection and so on. Based on the study of discrete modeling method and material removal algorithm, a complete virtual turning system for special-shaped screw was set up in this paper, and the process of material removal was realized in the machining of special-shaped screw. Examples show that the system has good real-time, interactive and dynamic simulation ability, and provides a guarantee for the actual NC turning of special-shaped screw.
【學(xué)位授予單位】:河南科技大學(xué)
【學(xué)位級別】:碩士
【學(xué)位授予年份】:2017
【分類號】:TG519.1
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