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Study on Control of Deep-Drawing Ear for Orthotropic TA2M Sheet Metal

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稀有金属材料与工程 2012年第2期41卷 208-211页

作者： Wu Jianjun Zhang Shunying Jin Li Eucational ministry key laboratory of contemporary design and integrated manufacturing technology Northwestern Polytechnical University Xi'an 710072 China

为直角的 TA2M 表金属，过去常描述 anisotropy R 的变化的可用的三角功能被介绍。把对价值 R 的描述基于上面，潜力在凸缘上珍视的一个新假设外部边界定期根据 anisotropy R 的分发法律被安排被建议了，潜在的理论和边界元素方法被用... 详细信息

为直角的 TA2M 表金属，过去常描述 anisotropy R 的变化的可用的三角功能被介绍。把对价值 R 的描述基于上面，潜力在凸缘上珍视的一个新假设外部边界定期根据 anisotropy R 的分发法律被安排被建议了，潜在的理论和边界元素方法被用来计算将提供一个好方法为 orthotropic TA2M 控制深绘画的耳朵的合理空白的形状表金属。通过实际申请，介绍空白的设计途径被同意为深绘画的耳朵的控制有效。

关键词：稀有金属材料金属材料工程 TA2M

Thinking process rules extraction for manufacturing process design

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Advances in manufacturing 2017年第4期5卷 321-334页

作者： Jing-Tao Zhou Xiang-Qian Li Ming-Wei Wang Rui Niu Qing Xu key laboratory of contemporary design and integrated manufacturing technology Ministry of Education of ChinaNorthwestern Polytechnical University Xi'an 710072People's Republic of China Department of Software and Information Service Research Electronic technology Information Research Institute Ministry of Industry and Information Technology of the People's Republic of China Beijing 100040 People's Republic of China

To realize the reuse of process design knowledge and improve the efficiency and quality of process design, a method for extracting thinking process rules for process design is proposed. An instance representation model of the process planning reflecting the thinking process of techni- cians is established to achieve an effective representation of the process documents. The related process attributes are extracted from the model to form the related events. The manifold learning algorithm and clustering analysis are used to preprocess the process instance data. A rule extraction mechanism of process design is introduced, which is based on the related events after dimension reduction and clustering, and uses the association rule mining algorithm to realize the similar process information extraction in the same cluster. Through the vectorization description of the related events, the final process design rules are formed. Finally, an example is given to evaluate the method of process design rules extraction.

关键词： Process design rules Process design rules extraction Process planning model Related event Manifold learning

Optimal interface surface determination for multi-axis freeform surface machining with both roughing and finishing

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Chinese Journal of Aeronautics 2018年第2期31卷 370-384页

作者： Lufeng CHEN Pengcheng HU Ming LUO Kai TANG Hong Kong University of Science and technology Hong Kong China National Numerical Control System Engineering Research Center Huazhong University of Science and Technology Wuhan 430074 China key laboratory of contemporary design and integrated manufacturing technology Ministory of EducationNorthwestern Polytechnical University Xi'an 710072 China

In the current practice of multi-axis machining of freeform surfaces, the interface surface between the roughing and finishing process is simply an offset surface of the nominal surface. While there have already been attempts at minimizing the machining time by considering the kinematic capacities of the machine tool and/or the physical constraints such as the cutting force, they all target independently at either the finishing or the roughing process alone and are based on the simple premise of an offset interface surface. Conceivably, since the total machining time should count that of both roughing and finishing process and both of them crucially depend on the interface surface, it is natural to ask if, under the same kinematic capacities and the same physical constraints, there is a nontrivial interface surface whose corresponding total machining time will be the minimum among all the possible（infinite） choices of interface surfaces, and this is the motivation behind the work of this paper. Specifically, with respect to the specific type of iso-planar milling for both roughing and finishing, we present a practical algorithm for determining such an optimal interface surface for an arbitrary freeform surface. While the algorithm is proposed for iso-planar milling, it can be easily adapted to other types of milling strategy such as contour milling. Both computer simulation and physical cutting experiments of the proposed method have convincingly demonstrated its advantages over the traditional simple offset method.

关键词： Feed rate Finishing and roughing process Interface surface lso-planar tool path Physical constraints

Comparisons of Heat Transfer Enhancement of an Internal Blade Tip with Metal or Insulating Pins

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Advances in Applied Mathematics and Mechanics 2011年第3期3卷 297-309页

作者： Gongnan Xie Bengt Sunden The key laboratory of contemporary design and integrated manufacturing technology Northwestern Polytechnical UniversityXi’an 710072ShaanxiChina Division of Heat Transfer Lund UniversitySE-22100LundSweden

Cooling methods are needed for turbine blade tips to ensure a long durability and safe operation.A common way to cool a tip is to use serpentine passages with 180-deg turn under the blade tip-cap taking advantage of the threedimensional turning effect and impingement like *** internal convective cooling is therefore required to increase the blade tip *** the present study,augmented heat transfer of an internal blade tip with pin-fin arrays has been investigated numerically using a conjugate heat transfer *** computational domain includes the fluid region and the solid pins as well as the tip *** convective heat transfer between the fluid and pins,and heat conduction within pins and tip are simultaneously *** main objective of the present study is to observe the effect of the pin material on heat transfer enhancement of the pin-finned *** is found that due to the combination of turning,impingement and pin-fin crossflow,the heat transfer coefficient of a pin-finned tip is a factor of 2.9 higher than that of a smooth tip at the cost of an increased pressure drop by less than 10%.The usage of metal pins can reduce the tip temperature effectively and thereby remove the heat load from the ***,it is found that the tip heat transfer is enhanced even by using insulating pins having low thermal conductivity at low Reynolds *** comparisons of overall performances are also included.

关键词： Heat transfer enhancement tip-wall pins thermal conductivity weight

Surface shape control of the workpiece in a double-spindle triple-workstation wafer grinder

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Journal of Semiconductors 2011年第10期32卷 78-85页

作者：朱祥龙康仁科董志刚冯光 key laboratory for Precision & Non-traditional Machining technology of ministry of education Dalian University of Technology

Double-spindle triple-workstation（DSTW） ultra precision grinders are mainly used in production lines for manufacturing and back thinning large diameter（≥300 mm） silicon wafers for integrated *** is important, but insufficiently studied,to control the wafer shape ground on a DSTW grinder by adjusting the inclination angles of the spindles and work *** this paper,the requirements of the inclination angle adjustment of the grinding spindles and work tables in DSTW wafer grinders are analyzed.A reasonable configuration of the grinding spindles and work tables in DSTW wafer grinders are *** on the proposed configuration,an adjustment method of the inclination angle of grinding spindles and work tables for DSTW wafer grinders is put forward. The mathematical models of wafer shape with the adjustment amount of inclination angles for both fine and rough grinding spindles are *** proposed grinder configuration and adjustment method will provide helpful instruction for DSTW wafer grinder design.

关键词： grinder silicon wafer surface shape control chuck dressing modeling

Tool Path Optimization for the Blade Spiral Machining

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Tool Path Optimization for the Blade Spiral Machining

2007国际机械工程与力学会议

作者： Chenwei SHAN Dinghua ZHANG Weiwei LIU Junxue REN Xiaojun LIN The key laboratory of contemporary design and integrated manufacturing technology Ministry of Education Northwestern Polytechnical University

This paper presents an optimization approach that generates a smooth tool path for four or five-axis spiral machining of blades. Firstly, based on the primary curvature radiuses and parameter characteristics, the blade surface is subdivided into four regions including suction surface subarea, pressure surface subarea, leading and trailing edge surface subareas. Geometric algorithms are proposed for partitioning blade surface regions. In order to overcome the overcut on leading and trailing edges, the optimized spiral machining strategy is further developed for blades. The blade surfaces can be cut continuously with minimum tool retractions during the cutting operations. When the suction and pressure surfaces are machined, the cutter can pass by the leading and trailing edges without overcut rapidly, and it allows blades to be machined at high speed. Finally, successful experimental results are given to testify the proposed approach. The result shows that the methods this paper presented can improve the blade machining quality, especially near the leading and trailing edges.

关键词： Blade Spiral machining freeform surfaces machining Tool path

Influence of Cutter Geometric Parameters on the Stability of Milling Process of Thin-walled Blades

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Influence of Cutter Geometric Parameters on the Stability of...

2012 International Conference Mechatronic Systems and Materials Application(ICMSMA 2012)

作者： Wei-Wei Liu Feng Li Chen-Wei Shan Xiao-Juan Gao key laboratory of contemporary design and integrated manufacturing technology Ministry of Education Northwestern Polytechnical University

In this paper, a new experiment procedure is proposed to study the influence of cutter parameters and clamping methods on the stability of the milling process of thin-walled bladeA dedicated fixture is designed to carry out the experimentSimulation results show that the new clamping system can enhance the rigidity of thin-walled blade to reduce cutting deformation and chatter vibration phenomenonThen, cutter and cutting parameters can be optimized properly to make the system obtain high rigidity and high performance stable milling processIndustrial application indicates that the new system can improve the cutting performance and ensure the cutting quality.

关键词： Chatter stability Thin-walled blade Milling Cutter parameter.

Structure of Mold Surface for Stress Relaxation Forming of Integral Panel of 2124 Aluminum Alloy

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Structure of Mold Surface for Stress Relaxation Forming of I...

2012 International Conference on Mechanical Engineering and Materials(ICMEM 2012)

作者： Zhong Gan Yuping Wu Jiazan Zhu Haibing Tan key laboratory of contemporary design and integrated manufacturing technology Northwestern Polytechnical UniversityMinistry of Education

This paper proposed a method and process of stress relaxation forming based on initial geometric springback compensation-finite element optimization-revision by experiment *** material parameters of 2124 aluminum alloy by a series of foundation craft experiments;springback law on the structure of 2124 aluminum alloy by foundation experiment of autoclave forming of T test specimens,that use to compensate the mold surface with the geometric *** precision of the geometric springback compensation of the mold surface is about 3 mm;while after the finite element iteration optimization on the mold surface with the initial geometric springback compensation,the deviation of that between the testing date and the theory appearance of specimens can reach the magnitude about ±1.2 *** use the mold "frequency domain" revision algorithm based on experiment iteration to revise local mold surface of the stress relaxation *** testing date shows the precision control in ±0.5 mm that satisfied with the application of engineering.

关键词： stress relaxation forming geometric springback compensation finite element optimization mold revision among frequency domain

Research on Modeling Product Service Network Oriented to Product Lifecycle

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Research on Modeling Product Service Network Oriented to Pro...

2012年计算机应用与系统建模国际会议

作者： Ji Li Rong Mo key laboratory of contemporary design and integrated manufacturing technology Ministry of Education Northwestern Polytechnical University

The merge and interaction of manufacturing and services trigger emergence of service-embedded manufacturing paradigm. Due to the development of this advanced manufacturing paradigm, product Service Network modeling is proposed in this paper. Firstly, the concept and characteristics of the network as well as the relationship between products and services were deeply analyzed. Then the BOM to meet the needs of the service-embedded manufacturing was established. The service-embedded manufacturing network model was constructed on this basis. The model includes design, manufacturing and maintenance and was oriented to product life. The network model will Provide valuable information and research material to the service-embedded manufacturing both in theory and practice.

关键词： service-embedded manufacturing manufacturing network product lifecycle Bill of Material