Taguchi试验设计在注射成型工艺参数优化中的应用

采用Taguchi正交试验设计方法,结合有限元分析软件研究工艺参数对注射制品翘曲变形量的影响,获得最优的工艺参数使制品的翘曲变形量最小,以塑料齿轮为研究对象,采用L27(313)正交表进行试验,对试验结果进行级差和方差分析,研究各个参数及参数之间的交互作用对制品翘曲变形量的影响程度,研究发现,填充时间、熔体温度和保压压力的变化对注射制品的翘曲变形量有显著影响。     

Design of experiments (DOE) technique for microwave/millimeter wave flip‐chip optimization

We present a design of experiments (DOE) technique for microwave/millimeter wave flip‐chip characterization and optimization. Two optimization approaches, signal bump misalignment and transmission line compensation, are combined together for optimal performance for high frequency operation. First, the design of experiments method is presented and its advantages are emphasized. Then, the two techniques are combined together in a factorial experiment with the purpose of optimizing the return loss to any desired frequency. The experiment is based on test structure fabrication and measurements. The one‐factor‐at‐a‐time strategy shows that return loss performance is increased with the misalignment values and decreased with compensation for the frequency range of interest. However, the statistical analysis revealed that the optimal performance is achieved for maximum compensation, and minimum misalignment. The optimal structure is measured from 1 to 75 GHz and shows return loss better than 17 dB. The method can be extended to include more optimization factors in different analysis intervals. Copyright © 2003 John Wiley & Sons, Ltd.     

某轿车车身正面碰撞安全性能优化

针对"汽车车身安全性能指标改进"的项目要求,利用有限元碰撞仿真技术,通过田口方法(DOE)和自动型面优化方法(morph)分析正面碰撞中车身结构存在的问题,完成结构优化,达到改进车身安全性能的目的。通过此方法可为解决车身的碰撞安全性能提供参考,提高工作效率。     

Workshop Oriented Tolerance Synthesis for Spatial PKM

To promote the pose accuracy performance of a spatial parallel kinematic Mechanism( PKM) in service,a workshop oriented tolerance synthesis method based on design of experiment( DOE) is proposed,which involves two consecutive stages. In the first stage of DOE,the tolerance factor sensitivities are obtained according to initial tolerance settings with the consideration of the current manufacturing capacity,and the second stage of DOE makes use of them to produce multiple tolerance allocations which can adapt to current manufacturing capacity. A tolerance synthesis procedure is developed and integrated in tolerance design system for PKM. Comparing the results with peer method,the validity and practicability of this method is verified.     

Influence of the operating conditions on the electrochemical disinfection process of natural waters at BDD electrodes

Results are reported of an investigation of the oxidation products formed during electrolyses of aqueous solutions of NaCl, in which the initial concentration of chloride ions was maintained at levels normally present in natural waters. The Design of Experiments (DOE) technique has been used effectively to plan a framework of experiments, in which the main operative parameters: current density, electrolyte stirring rate, and cell geometry, were varied at two levels. Their effects, as well as their possible interactions have been evaluated on the yield of chloride oxidation and on the selectivity of the reaction towards the formation of hypochlorite.     

加速度传感器壳体结构参数优化

合理的结构参数组合可提高加速度传感器壳体结构的固有频率,保证传感器在振动环境下输出信号稳定.通过建立竖直薄板力学模型,确定影响加速度传感器壳体固有频率的结构因素.基于响应面法思想,利用试验设计的方法,以加速度传感器壳体固有频率为指标,各结构参数为因素,设计二次回归正交旋转组合试验.通过ABAQUS 6.10软件建立各组试验结构参数组合下的分析模型并提取固有频率,最终确定使固有频率维持在较高水平的结构参数组合区间.通过对优化后参数进行验证性试验,表明优化后区间随机结构参数组合下加速度传感器壳体固有频率能够达到10 kHz以上.     

采用DOE对十字轴硬态断续切削的研究与应用

DOE是以概率论与数理统计为理论基础、合理安排试验的一种方法论。它研究如何高效而经济地获取数据信息、科学地分析处理、得出正确的结论。硬态切削是本世纪最富有生气的切削技术之一,它可以部分地代替磨削的工作,而且在绝大多数场合都可以实施干式切削,如何成功实施硬态切削工艺已成为世界各国致力研究的重点课题。通过三个因子的一般全因子试验方案进行试验、对比分析得出的最佳切削参数和刀具,在生产实践中能够有效降低废品率,并且过程能力指数Cpk达到较好水平。现该工艺已经广泛应用于生产。     

Analysis of tool wear and surface finish in hard turning

Hard turning is a profitable alternative to finish grinding. The ultimate aim of hard turning is to remove work piece material in a single cut rather than a lengthy grinding operation in order to reduce processing time, production cost, surface roughness, and setup time, and to remain competitive. In recent years, interrupted hard turning, which is the process of turning hardened parts with areas of interrupted surfaces, has also been encouraged. The process of hard turning offers many potential benefits compared to the conventional grinding operation. Additionally, tool wear, tool life, quality of surface turned, and amount of material removed are also predicted. In this analysis, 18 different machining conditions, with three different grades of polycrystalline cubic boron nitride (PCBN), cutting tool are considered. This paper describes the various characteristics in terms of component quality, tool life, tool wear, effects of individual parameters on tool life and material removal, and economics of operation. The newer solution, a hard turning operation, is performed on a lathe. In this study, the PCBN tool inserts are used with a WIDAX PT GNR 2525 M16 tool holder. The hardened material selected for hard turning is commercially available engine crank pin material.