Papers by Author: Ai Qin Lin

Abstract: Introduced reverse engineering technology and working principle. Researched reverse design process of the complex curved surface "spider". The data were collected by means of multiple scanning measuring with laser scanner. Used Geomagic Studio software for date point cloud processed of complex curved surface. Used UG software for surface reconstruction designed. Product reduction and improvement of the design were finished rapidly and high quality. Model of spider was printed with rapid prototyping technology. Compared with physical, the model’s reliability and accuracy were verified by reverse engineering design.Keywords: complex surface; reverse engineering technology; UG; Geomagic Studio software

Abstract: Aiming at the problems that diversity and blindness of milling parameter selection, propose a milling parameter optimization method that based on control of surface roughness by coupling neural network and annealing genetic hybrid algorithm. This method makes advantages of experimental design technique, neural network and annealing genetic hybrid algorithm. High speed milling of aluminum alloy 7475 surface roughness experiments were designed based on uniform experimental design scheme. A neural network predictive model for surface roughness was created using experimental data. The predictive model and analytical definition of material remove rate had consisted of optimization problem. It was used annealing genetic hybrid algorithm to optimize model. Proved by test ,the results show that the optimal parameter can improve surface quality. This indicates that the method can accurately milling parameter optimize.

Abstract: To surface milling cutters for research object, established considering the single spindle partial pendulum milling cutter tooth surfaces of high speed cutting 3d surface morphology simulation model by using graphic matrix transformation principle and vector algorithms. Comparing the simulation and forecast of surface morphology and surface roughness with the actual machining surface morphology and surface roughness by using the workpiece simulation algorithm meshing, we verify the correctness of the simulation model. The simulation analyses the influence regularity of surface morphology and surface roughness by changing cutting parameters and geometrical parameters. This can help us choosing the reasonable cutting parameters and geometrical parameters and have significance on the actual machining. The surface milling cutters are high efficiency and good quality of cutting big plane or curved surface. With the development of high speed cutting technology, in high speed milling process, product crumbs tumor and scales thorn hardly exists, so cutter geometrical parameters, cutting data and so on will be the main influence reasons of surface roughness. In order to satisfied the quality requirements, at present, we choice tools and determine the milling parameters depending on experience but it is limited. The surface roughness of the processing components is reflected intuitively by processed surface of microscopic geometric shape. So surface of microscopic geometric shape produced by theory emulation is significant to forecast the surface roughness and selecting reasonable cutting parameters. Currently, there are some simulation method researches about surface of microscopic geometric shape. Zhao Xiao ming et al [1, 2] has researched the simulation modeling of microscopic geometric shape of ball end mills during processing; Xu An ping et al [3, 4] has researched the simulation modeling methods of peripherally milling processing; Zhang Guang Peng et al [5] has researched the inversion multiple tooth surfaces of the milling cutter surface morphology simulation and develop simulation software. But all above researches are ideal simulation of surface shape. There are few researches about simulation of surface shape on condition of spindle partial pendulum. Based on object of surface milling cutters, this article researches simulation modeling methods of surface topography on condition of high speed milling and give an account of the corresponding simulation algorithm. From the article, we also get the influence law of microscopic geometric shape depending on different milling dosage, cutter geometrical parameters and eccentric quantity and get the significance conclusion to actual production.

Abstract: The present work aims at simulating three-dimensional milling operation of aluminum allo7451.Building a nose ring radius and edge radius tool model. Using finite element analysis software , conducted a three-dimensional simulation of milling process. Milling force, milling temperature, stress distribution and chip shape of milling process have been got. A milling force experiment was carried out under the same cutting conditions as the simulation, and a good agreement between the simulation result and the experimental result was achieved, and chip shape matched the practice well. The simulation shows that the three-dimensional finite element milling cutter model and the workpiece model can be used to correctly simulate precision milling process, optimizing the cutting parameters by analyzing variation of the cutting force, the temperature and equivalent stress.

Abstract: High-speed cutting is a complexity and uncertainty process .The cutting parameters optimization is ambiguous. In this paper, based on the orthogonal experiment of high-speed milling aluminum alloy 7475, we use fuzzy comprehensive evaluation to optimize the parameters high-speed milling of aluminum alloy 7475 in the indication of surface roughness, cutting force, material removal rate. We have got cutting parameters optimal that is highly processing quality and productivity. Compared optimal results with orthogonal experimental results, we found that the optimal result is reliable. The study shows that fuzzy comprehensive evaluation method can optimize the parameters of high-speed milling of aluminum alloy 7475 accurately. This method has also a good application effect to other materials and great significance to guide actual production.