Geometric algorithms for automated design of rotary-platen multi-shot molds

This paper describes algorithms for automated design of rotary-platen type of multi-shot molds for manufacturing multi-material objects. The approach behind our algorithms works in the following manner. First, we classify the given multi-material object into several basic types based on the relationships among different components in the object. For every basic type, we find a molding sequence based on the precedence constraints resulting due to accessibility and disassembly requirements. Then, starting from the last mold stage, we generate the mold pieces for every mold stage. We expect that algorithms described in this paper will provide the necessary foundations for automating the design of rotary-platen molds.     

Selective induction heating to eliminate the fundamental defects of thin‐walled moldings used in electrical industry

In the study, a new technology of selective induction heating of injection mold based on the introduction of temperature gradient in the area of one cavity is presented. Only those surfaces of the mold were subjected to heating that were responsible for creation of defects. With use of the ANSYS program the theoretical model and the simulations of induction heating of separated forming surface were developed. On the basis of simulation tests the mold was designed and created to produce the experimental molding part with the wall thickness of 0.4 mm. There were made two production series: in the conventional technology and with support of selective induction heating of the selected forming parts. The application of induction heating technology allowed to entirely eliminate the defects appeared during the production. The results showed that the shape and the localization of the induction coil have great influence on the time of heating. © 2017 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2017 , 134, 44992.     

ZG340－640车轮铁模挂砂工艺

在ＺＧ３４０－６４０车轮铸造中，铁模挂砂是关键的工艺技术之一。简要介绍了原车轮生产工艺，主要铸造缺陷及热裂产生；提出了铁模挂砂生产全套工艺参数，并获得了满意的质量效果和显著的经济效益     

40.5″A型硫化机中心机构C型化的改造

介绍了对 40 5″A型双模定型硫化机实施中心机构C型化技术改造的成功经验 ,并指出改造后的硫化机特别适合于硫化胎体层数少、胎侧厚度小、可以进行高温短时间热模硫化的轿车子午线轮胎 ,具有广泛的推广应用价值。     

Microbiology on Indoor Air `99– What is New and Interesting? An Overview of Selected Papers Presented in Edinburgh,August, 1999

A multidisciplinary approach to microbiological implications of indoor air is fruitful for research as well as management of health and building problems. The Finnish and the Danish mold programs are examples of such productive collaborative studies. Dust samples taken from classrooms in schools where occupants complain of building-related symptoms (BRS) demonstrated an inflammatory potential in vitro, measured as a release of cytokine interleukin (IL)-8. An increase of the metabolite NO and liberation of tumor necrosis factor (TNF)-alpha and other cytokines during exposure were obtained in vivo, was presented based on these programs and on epidemiological studies on residential fungal contamination and health conducted in Canada and The Netherlands. New methods for assessing fungal exposure are PCA analysis for the toxigenic mold Stachybotrys chartarum and EPS-Asp/Pen for detecting of Aspergillus and Penicillium in dust. Based on a limited data set it is shown that emission rates of fungal spores are inversely proportional to relative humidity (RH), directly related to flow rate and to surface loading. Poor maintenance, risk constructions and risk materials are described in several studies as the main causes of water damage in buildings.     

汽车模具的型面数控加工

介绍了与刀具运动轨迹生成技术有关的几个概念,重点讨论了各种刀具运动轨迹的生成方法。如单曲面刀具运动轨迹,多曲面连续加工刀具运动轨迹,清根加工刀具运动轨迹和五轴加工刀具运动轨迹的生成方法。     

基于结构知识的机械产品设计技术

针对产品设计现状,研究结构设计知识.通过结构知识单元表达概念信息,对设计规则进行BNF表示,之后提取产品设计知识与规则,在此基础上提出了基于结构知识的机械产品设计方法.该方法在多腔模系统设计中得到了成功应用.     

亚洲模具工业与技术的发展状况

基于亚洲模具工业联合会会议上各成员协会的报告,介绍了近年来亚洲各国模具工业发展状况,并对新加坡模具技术的研究和发展动态,特别是网络制造技术、超精加工技术及其在精密模具制造中的应用、CNC虚拟培训等进行了分析和讨论。     

3M Petrifilm~(TM)快速测试片与国标法检测饮料中霉菌和酵母的比较

本研究使用3M Petrifilm~(TM)快速霉菌酵母测试片以及国标法同时对某功能维生素饮料样品进行霉菌计数和酵母计数检测,比较两者结果是否具有显著性差异。试验筛选采用白色念珠菌(Candida albicans)、拟热带假丝酵母(Candida tropicalis)、汉逊德巴利酵母(Debaryomyces hansenii)、绿木霉(Trichoderma virens)、炭黑曲霉(Aspergillus carbonarius)5株标准菌株进行试验,分别进行了菌株的预选试验、快速测试片检测的重复性试验和特异性试验,以及快速测试片法和国标法的比较试验。研究结果显示,菌株预选试验所筛选的菌株均能在测试样品中生长良好;重复性试验结果表明第二次结果均在第一次结果可接受范围内;特异性试验中表明快速测试片特异性良好;对比试验中使用两种方法对样品进行霉菌和酵母计数检测,结果使用F检验、t检验进行统计分析,结果表明3M Petrifilm~(TM)测试片法与国标法两种方法总体均值无显著差异。     

塑料异型材挤塑模模头校核

通过对塑料异型材挤出模模头结构进行分析,以聚合物流变学为理论基础,对机头流道的不同区域分别建立压力降计算公式和熔体停留时间计算公式,同时,通过对分流支架及型芯连接螺相进行受力分析,从而建立强度校核公式,最后介绍了以PBA为工具对AutoCAD进行二次开发,并编制了塑料异型材挤出模的分析验算程序。