钦州坭兴陶设计特色及发展研究

从钦州坭兴陶独特的陶土资源所具有品质特性出发,探讨了由此产生的特有成型工艺,基于打磨抛光和“窑变”工艺呈现出的坭兴陶作品的设计特色。为了进一步促进钦州坭兴陶的发展,在现有以中国文化和本土民族文化元素为主的基础上,加强借鉴其它陶艺产品在造型、装饰和工艺方式上的创新手法,从而打造出更丰富多彩的坭兴陶产品。     

赤峰砂器的工艺特征

赤峰砂器制作工艺是我国北方地区具有代表性的传统手工艺,作者在深入考察研究砂器工艺的基础上总结出赤峰砂器区别于其它陶瓷工艺的显著特征,指出内模成型工艺、使用半开敞式窑炉、快速烧成以及呛釉工艺都是砂器制作工艺区别于其他陶瓷工艺的独特之处。并在材料与工艺、手工劳动的价值方面提出了自己的见解。     

Moldability diagrams for the reaction injection molding of a polyurethane crosslinking system

A trial and error approach reflects the state of the art in reaction injection molding. Material and process parameters determine the “moldability” of a specific system in a particular application. The concept of “molding areas” on the critical parameters plane can be extended form thermoplastic injection molding (TIM) to reaction injection molding (RIM). In this work moldability diagrams for the filling and curing stages of a RIM process are obtained based on a simplified engineering approach. The key process parameters chosen for the filling stage are initial material temperature and filling time. In the curing stage, the critical parameters are considered to be mold wall temperature and demold time. Experimental results obtained on a laboratory-scale RIM machine on a Crosslinking polyurethane system are used to check the validity of the predicted molding areas. The agreement obtained is satisfactory considering the broad range of processing parameters used.     

古雅之中见光华——试论广西坭兴陶的无釉窑变艺术

广西钦州坭兴陶在雕刻、成型、窑变方面自成一家,具有独特的艺术风格和地域特征,尤其是它的无釉窑变艺术,展示了其古朴素雅之外光华艳丽的一面,成为艺术风格的一大亮点。本文从坭兴陶窑变与雕刻、磨光等装饰手段的关系以及窑变外在特征方面分析阐述这种独特的窑变现象,从而揭示其浑然天成的个性审美内涵。     

气辅注射成型工艺参数正交试验CAE模拟设定

介绍了气辅注射成型中的CAE分析方法;阐述了气辅制品缺陷与工艺参数的关系;运用正交试验方法对待定气辅成型工艺参数进行合理的实验设计,采用塑料成型过程模拟仿真软件MoldflowPlasticInsight5.0对气辅成型塑料周转箱制品进行FLOW-COOL-FLOW分析,代替传统试模方法,并对CAE后处理结果进行综合分析,得到一组优化的工艺参数组合。该组气辅成型工艺参数组合可作为实际生产中的气辅成型工艺参数设定值。     

Simulation of compression molding for sheet molding compound considering the anisotropic effect

An improved model of the anisotropic flow characteristics of SMC (sheet molding compound) during compression molding is developed. This study is intended to complement our previous paper, which was conducted to determine the anisotropic parameters for short fiber reinforced thermosets SMC (16). Our prior study measured flow viscosities and material anisotropy by means of axisymmetric and plane strain compression molding tests. The current study, in order to identify the superior flow model from the choices (1) isotropic, (2) constant anisotropic and (3) varying anisotropic, applies the finite element method to obtain numerical results, which are subsequently compared with experimental results to determine the flow model with the best fit. The anisotropic parameters of the shear directions are determined by use of normal and planar parameters because SMC is planar isotropic. Six varying anisotropic parameters and six viscosity values are estimated during molding experiments, which are conducted at room temperature so that the polymer does not cure. Two-dimensional molding numerical analyses are carried out to explain two experimental classes, axisymmetric and plane strain compression molding. The load-levels predicted by the isotropic model, anisotropic model (parameter values fixed) and anisotropic model (parameter values varying) are compared with the experimentally derived values, the results showing that the varying anisotropic model best fits SMC compression behavior.     

基于LM-BP神经网络的汽车AB柱内饰板注塑CAE优化分析

以某汽车内饰A、B柱上内饰板产品同模注塑为例,对产品的注塑工艺进行了优化设计,包括不同浇注系统的优化选用、已选定浇注系统的成型质量优化、成型工艺参数优化3个过程。在成型工艺优化中,对传统的BP神经网络进行了基于LM算法的结构改进,采用正交试验粗选优化工艺路径,改进后的LM-BP神经网络对细化优化工艺路径有着较好的预测功能。通过LM-BP神经网络辅助优选,得到了很好的产品注塑工艺组合参数,将之应用于实际注塑时,获得了质量良好的注塑产品,具有较强的设计实践指导意义。     

Numerical simulation of thermoplastic wheat starch injection molding process

A numerical study is carried out on the thermoplastic wheat starch injection molding process. The simulation is performed using currently available molding software to determine optimal molding parameters. The molding of a standardized sample for tensile test is considered. It is shown that the conventional continuum mechanics equations can be used for modeling the injection molding of thermoplastic starch. These equations are solved using the finite element method. Comparisons with some experimental results are presented, indicating good agreement. Data on the processing of thermoplastic starch and several other basic aspects are also provided.     

陶瓷大树上一根寂寞的树枝——漫谈中国现代陶艺格局中的黑陶艺术

现代黑陶艺术是中国现代陶艺的重要组成部分，但今天它的发展状况不容乐观，原因是多方面的。如何看待黑陶，如何看待现代黑陶艺术，如何将黑陶从工艺品、商品的套路中走出来，将它融入到现代陶艺格局中，这将是所有陶艺工作者的共同任务。     

计算机模拟技术在高分子材料注塑成型中的应用

以翘曲变形量为评价指标,采用Moldflow软件和正交试验法对高分子塑件注塑成型工艺参数进行优化,根据Taguchi指标权重计算结果,选取熔体温度、模具温度、注射时间为因素,建立3因素3水平正交试验,获得了注塑成型中的最优工艺参数.结果表明:最优工艺参数为模具温度240?℃,熔体温度32?℃,注射时间0.68?s,此条...     

MEDIEVAL EUROPEAN POTTERY1

This paper deals with pottery and porcelain from the time of the Fall of Rome through the sixteenth century. Italian pottery before the Renaissance and Majolica ware are discussed under Italian pottery. French pottery is classed under the two heads of Faience and Palissy ware. The influence of the Moors and Arabs upon Spanish pottery and also the origin of Majolica ware is taken up under Spanish pottery. The pottery of England before the Norman period and after the Norman Conquest is discussed. The pottery of Central Europe is dealt with under the head of German pottery. Porcelain is discussed from 200 B.C. on through its introduction into Europe and up to the earliest imitations of porcelain in the sixteenth century.     

PVC/秸秆复合发泡材料成型工艺初探

简述聚氯乙烯(PVC)/秸秆复合发泡材料的优点,介绍PVC/秸秆复合发泡材料的3种成型方法,包括模压成型法、注塑成型法和连续挤出成型法,简述了各自工艺参数如温度、压力等对制品的影响,对该种材料成型设备的发展趋势进行了展望。     

Optimization of cure kinetics parameter estimation for structural reaction injection molding/resin transfer molding

A numerical method is proposed for polymer kinetic parameter estimation of either Structural Reaction Injection Molding (SRIM) or Resin Transfer Molding (RTM). The method simulates either radial flow or axial flow of reactive resins through a fiber preform inside a mold cavity. This method considers a non‐isothermal environment with different inlet boundary conditions. Based on the molding conditions, this method can find the best values of chemical kinetic parameters by comparing the simulated temperature history and the experimental temperature history. Since the kinetic parameters are estimated with the real molding conditions, the simulations using these parameter values can have better agreement with molding data than those parameters which are obtained from idealized conditions such as Differential Scanning Calorimeter (DSC). The optimization approach was verified by estimating kinetics parameters for RTM data available in the literature. Temperatures predicted by the optimized kinetics parameters are compared with experimental data for two different molding conditions: injection of a thermally activated resin into a radial mold under constant pressure flow, and injection of a mix activated resin into a radial mold under constant volume. In both cases, the optimized kinetics parameters fit the temperature data well.     

酚醛SMC模压工艺参数的确定

本文对酚醛SMC的模压工艺进行了研究，确定了酚醛SMC模压成型时的模压温度，成型压力，保温时间等工艺参数。     

基于Kriging与GA的双层变模温注射成型收缩控制策略

高温、高压的成型条件,使双层变模温制品的成型收缩对工艺参数的变化极为敏感,双层变模温制品的成型收缩控制策略成为提高制品质量的关键。以某空调遥控器前盖双层变模温成型工艺开发为例,探讨并制定了其成型收缩的控制策略。确定了考量成型收缩的多目标评价体系及参数变量,以拉丁超立方取样设计试验,并利用数值模拟软件进行充模、保压及冷却等过程模拟获取试验数据,建立了基于Kriging代理模型的变量与评价指标间的数学关系;利用遗传算法对数学关系进行迭代,寻找最优成型收缩的评价指标及变量组合;最后,将模拟及生产试验对研究策略的科学有效性进行验证。     

采用RFR-GA算法的薄壁注塑件质量多目标优化

汽车内饰件可由注塑加工获得,但成型过程中塑件产生的翘曲、体积收缩较大,针对该问题,以某汽车薄壁注塑件为例,研究了其注塑工艺参数的优化方法.通过以注塑过程中的最小翘曲和最小体积收缩率为目标函数,以注塑温度、模具温度、注射压力、保压压力、保压时间以及冷却时间等参数作为设计变量,构建了多目标全局优化模型.利用Moldflow...     

氧化锆陶瓷注射成形工艺研究

研究了氧化锆陶瓷粉末注射成形工艺过程，包括粘结剂的选择、喂料粉末装载量的确定、混炼工艺及混炼扭矩的研究，注射压力、注射温度、保压压力、模具温度、注射速度等注射成形工艺对成形坯质量的影响，以及溶剂脱脂温度、样品厚度、粉末粒度及形藐等对溶剂脱脂速率的影响及后续热脱脂工艺，扶得了一条优化的注射成形工艺路线。     

Determination of the Thickness of the Glass Band in a Tank with Melted Tin at Different Stages of Molding

A method for determination of the geometric parameters of the glass band in a tank with tin melt is developed, and the effect of molding conditions on these parameters is investigated. Data providing a more accurate understanding of the processes in different stages of molding are obtained and systematized. It is established that an equilibrium glass band thickness is formed under the effect of the edge-restricting machines and not in free spreading of the melt in the initial stage of molding, as was earlier believed.     

共注射成型技术及其发展

介绍两种典型共注射成型技术,即双色注射和夹芯注射,以及在共注射成型基础上发展起来的气体辅助共注射成型技术和层状注射成型技术,并对各种共注射成型技术的工艺过程、优点及应用也作了介绍。讨论了双色注射成型过程中工艺参数对注射成型的影响;对夹芯注射成型过程中的芯层熔体前沿突破现象及其影响因素也进行了讨论。     

Heat transfer in injection molding of crystallizable polymers

A model is proposed for the treatment of heat transfer with crystallization during plastics processing in general, and injection molding in particular. The model incorporates experimentally determined crystallization kinetics parameters. It permits the calculation of the distribution of both temperature and crystallinity in the molding. Theoretical predictions are in good agreement with experimental measurements in both injection molding and a prototype apparatus.