Key technologies for virtual product development systems
The three-dimensional modeling of parts 3D modeling is the core content of virtual product development. Its further applications are virtual assembly, dynamic process simulation, graphic data processing, finite element analysis and animation. The three-dimensional modeling method of the parts includes surface modeling, solid modeling or solid surface integration. At present, the solid modeling technology is mainly based on parametric design and feature-oriented design. Parametric design is an important direction of virtual design. Currently, most CAD software provides this function, allowing users to easily and repeatedly modify design parameters. In addition, the "precise feature solid modeling" technology has abandoned the traditional voxel combination and the cumbersome way of making the difference, making the whole design process more intuitive and simple. Most 3D CAD software provides surface modeling tools for independent environments. It can arbitrarily shape and edit complex surfaces, and through the interaction between surfaces and solids, it can realize mixed modeling operations such as surface cutting entities, surface generating entities, and surface constraint entities.
Virtual assembly Before the finite element analysis or dynamic analysis of components or the whole machine, the virtual parts of the completed design must be virtual assembled. The virtual assembly is a process in which the part model is repositioned according to the constraint relationship. It truly simulates the three-dimensional assembly process of the product according to the shape characteristics and precision characteristics of the product design. Common assembly methods include constrained assembly methods (such as coaxial, balanced, coincident, vertical, etc.) and unconstrained assembly with precise positioning tools (such as the CAXA entity design V2 software 3D ball). After assembly, interference inspection is generally performed to check whether there is interference between the parts or exceed the defined gap limit. The virtual assembly directly affects the results of subsequent finite element analysis and dynamic simulation.
The goal of finite element analysis virtual product development is to meet product performance requirements, shorten product cycle and reduce cost, which is inseparable from the performance analysis system. The objectives of computational analysis include: force analysis of components (static analysis and dynamics analysis), component safety for failure, product function detection, evaluation of external influences, weight reduction by lightweight components, and optimization of materials. Finite element analysis is currently the most important and widely used computer-aided analysis method. The finite element analysis can be performed by directly converting the 3D part model of the product or the method of dimensional reduction into a finite element analysis model and transmitting it to the CAE software system according to the data exchange standard.
Process design With CAM and CAPP software, the designed part process plan is determined. The main contents include: processing requirements for the dimensions, tolerances and precision of the machined parts, setting blanks, determining the way of loading the workpiece, selecting the machining tool, and determining the machining method. Determine the process route, set process parameters, and so on.
The simulation system uses CAM software to flexibly select various machining modes and machining parameters according to the shape characteristics of the workpiece to be machined, different process requirements and precision requirements, and quickly generate and edit the required tool path (ie the cutting path of the tool). The tool-work geometry can be simulated in real time or quickly by the CAM software's geometric simulation system to verify that the resulting tool path is correct and that there is an overcut.
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