浅谈应用复合钢板的压力容器制造工艺及相关要求

应用复合钢板的压力容器制造工艺有众多要求,制造具有一定特殊性,为更好的提升其制造工艺,本文对复合钢板的压力容器的制造相关工艺进行了分析研究。     

磁性材料——铁氧体制造工艺

<正> 文章介绍了铁氧体的一般制造工艺的(即干法制备)原料选择、混合、成型、造粒、烧结、切削研磨;以及湿法微粒氧化物的制造工艺,铁氧体磁石制造工艺、磁带制造工艺以及特殊铁氧体制造工艺。文章不仅     

S31254180度R=1.0D急弯弯头冷、热成型工艺的研究

美国某公司高温热解炉中用S31254 180度R=1D急弯弯头目前都采用铸造工艺制造,现采用钢管制造工艺为研究对象,对急弯弯头的冷、热制造工艺研究内容及关键技术加以论述,掌握了用钢管制造S31254 180度R=1D急弯弯头最佳工艺,为同类产品的制造提供参考,并按照该工艺制造的产品成功用于某公司项目的热解炉中,使用寿命...     

循环氢压缩机入口分液罐的制造

介绍了某石化公司循环氢压缩机入口分液罐的制造过程和特点,分析了制造上的难点,采取了合理的焊接工艺和制造工艺,对类似设备的制造具有重要的参考价值。     

离心式氯气压缩机主轴的加工

介绍了离心式氯气压缩机主轴的制造工艺。这种工艺保证了主轴的加工制造精度。     

34t重型钢立柱的制造

叙述了大型钢结构组装厂房钢立柱焊接反应形预制工艺、分段制造工艺、整体组装工艺，并针对重型钢立柱制造特点及难度，提出采用CO2气体保护焊方法、分段制造、整体组焊的制造工艺。实践证明：该工艺简单、实用、经济，制造质量高，整体尺寸精确。     

压力容器制造CAPP系统的研究开发

简要分析了压力容器制造工艺设计现状,介绍了压力容器制造要求和质量检验的主要内容,讨论了制造工艺设计内容、要求和流程,压力容器CAPP系统的基本要求。提出一种基于数据库的压力容器CAPP系统结构,包括:工艺设计、系统管理和资源库管理三大部分。采用VB编程,开发了基于开放式数据库的压力容器制造CAPP软件系统,可以完成所有压力容器制造工艺设计。经企业实际应用,该CAPP软件系统显著加快了工艺设计速度和效率、提高了设计质量和继承性,为工艺设计标准化和最优化及企业信息化建设创造了条件。     

干法炭黑与湿法炭黑工艺的比较研究

近年来,我国湿法炭黑制造工艺逐渐取代干法炭黑制造工艺,其环保性、经济性有目共睹,且产量上不断提升,本文将对干法炭黑与湿法炭黑制造工艺的区别进行比较,并着重指出了湿法炭黑工艺的优势。     

压力容器常见工艺缺陷产生的原因分析

压力容器制造产生的缺陷是压力容器发生破坏的根源，为保证压力容器制造质量，必须从制造工艺着手，包括材料检验、制造过程质量控制。本文从材料及制造工艺两方面分析了压力容器缺陷产生的原因。     

面向风电叶片制造工艺研究及创新体系的思考

风电叶片制造工艺系统的合理性对于新品开发、制造、型号的成功投产影响深远。参考航空工艺研究体系,结合风电叶片实际情况,总结出大型复合材料构件-风力发电叶片工艺系统的逻辑结构及组织特征,形成面向风电叶片制造的工艺设计逻辑。最终,构建了面向制造的工艺研究及创新体系,提出风电叶片工艺数据库、基于工艺参数驱动设计、面向实体制造、高效管控等方面的设想,并阐述了具体内容,为大型复合材料构件-风电叶片的工艺能力建设及创新提供有效支持。     

Insect antifeedant properties of anthranoids from the genusVismia

Vismiones and ferruginins, representatives of a new class of lypophilic anthranoids from the genusVismia were found to inhibit feeding in larvae of species ofSpodoptera, Heliothis, and inLocusta migratoria.     

Direct observation of freeze-thaw instability of latex coatings via high pressure freezing and cryogenic SEM

Despite its industrial importance, the subject of freeze-thaw (F/T) stability of latex coatings has not been studied extensively. There is also a lack of fundamental understanding about the process and the mechanisms through which a coating becomes destabilized. High pressure (2100 bar) freezing fixes the state of water-suspended particles of polymer binder and inorganic pigments without the growth of ice crystals during freezing that produce artifacts in direct imaging scanning electron microscopy (SEM) of fracture surfaces of frozen coatings. We show that by incorporating copolymerizable functional monomers, it is possible to achieve F/T stability in polymer latexes and in low-VOC paints, as judged by the microstructures revealed by the cryogenic SEM technique. Particle coalescence as well as pigment segregation in F/T unstable systems are visualized. In order to achieve F/T stability in paints, latex particles must not flocculate and should provide protection to inorganic pigment and extender particles. Because of the unique capabilities of the cryogenic SEM, we are able to separate the effects of freezing and thawing, and study the influence of the rate of freezing and thawing on F/T stability. Destabilization can be caused by either freezing or thawing. A slow freezing process is more detrimental to F/T stability than a fast freezing process; the latter actually preserves suspension stability during freezing. Presented at the 82nd Annual Meeting of the Federation of Societies for Coatings Technology, October 27–29, 2004 in Chicago, IL. Tied for first place in The John A. Gordon Best Paper Competition.     

Ethanol and (−)-α-Pinene: Attractant Kairomones for Bark and Ambrosia Beetles in the Southeastern US

In 2002–2004, we examined the flight responses of 49 species of native and exotic bark and ambrosia beetles (Coleoptera: Scolytidae and Platypodidae) to traps baited with ethanol and/or (−)-α-pinene in the southeastern US. Eight field trials were conducted in mature pine stands in Alabama, Florida, Georgia, North Carolina, and South Carolina. Funnel traps baited with ethanol lures (release rate, about 0.6 g/day at 25–28°C) were attractive to ten species of ambrosia beetles (Ambrosiodmus tachygraphus, Anisandrus sayi, Dryoxylon onoharaensum, Monarthrum mali, Xyleborinus saxesenii, Xyleborus affinis, Xyleborus ferrugineus, Xylosandrus compactus, Xylosandrus crassiusculus, and Xylosandrus germanus) and two species of bark beetles (Cryptocarenus heveae and Hypothenemus sp.). Traps baited with (−)-α-pinene lures (release rate, 2–6 g/day at 25–28°C) were attractive to five bark beetle species (Dendroctonus terebrans, Hylastes porculus, Hylastes salebrosus, Hylastes tenuis, and Ips grandicollis) and one platypodid ambrosia beetle species (Myoplatypus flavicornis). Ethanol enhanced responses of some species (Xyleborus pubescens, H. porculus, H. salebrosus, H. tenuis, and Pityophthorus cariniceps) to traps baited with (−)-α-pinene in some locations. (−)-α-Pinene interrupted the response of some ambrosia beetle species to traps baited with ethanol, but only the response of D. onoharaensum was interrupted consistently at most locations. Of 23 species of ambrosia beetles captured in our field trials, nine were exotic and accounted for 70–97% of total catches of ambrosia beetles. Our results provide support for the continued use of separate traps baited with ethanol alone and ethanol with (−)-α-pinene to detect and monitor common bark and ambrosia beetles from the southeastern region of the US.     

Methyl 2,4,6-decatrienoates Attract Stink Bugs and Tachinid Parasitoids

Halyomorpha halys (Stål) (Pentatomidae), called the brown marmorated stink bug (BMSB), is a newly invasive species in the eastern USA that is rapidly spreading from the original point of establishment in Allentown, PA. In its native range, the BMSB is reportedly attracted to methyl (E,E,Z)-2,4,6-decatrienoate, the male-produced pheromone of another pentatomid common in eastern Asia, Plautia stali Scott. In North America, Thyanta spp. are the only pentatomids known to produce methyl 2,4,6-decatrienoate [the (E,Z,Z)-isomer] as part of their pheromones. Methyl 2,4,6-decatrienoates were field-tested in Maryland to monitor the spread of the BMSB and to explore the possibility that Thyanta spp. are an alternate host for parasitic tachinid flies that use stink bug pheromones as host-finding kairomones. Here we report the first captures of adult and nymph BMSBs in traps baited with methyl (E,E,Z)-2,4,6-decatrienoate in central Maryland and present data verifying that the tachinid, Euclytia flava (Townsend), exploits methyl (E,Z,Z)-2,4,6-decatrienoate as a kairomone. We also report the unexpected finding that various isomers of methyl 2,4,6-decatrienoate attract Acrosternum hilare (Say), although this bug apparently does not produce methyl decatrienoates. Other stink bugs and tachinids native to North America were also attracted to methyl 2,4,6-decatrienoates. These data indicate there are Heteroptera in North America in addition to Thyanta spp. that probably use methyl 2,4,6-decatrienoates as pheromones. The evidence that some pentatomids exploit the pheromones of other true bugs as kairomones to find food or to congregate as a passive defense against tachinid parasitism is discussed.     

2007～2008年世界塑料工业进展

收集了2007年7月～2008年6月世界塑料工业的相关资料,介绍了2007～2008年国外塑料工业的发展情况,提供了世界塑料产量、消费量及全球各类树脂的需求量及产能情况.按通用热塑性树脂(聚乙烯、聚丙烯、聚苯乙烯、聚氯乙烯、ABS树脂)、工程塑料(尼龙、聚碳酸酯、聚甲醛、热塑性聚酯、聚苯醚)、特种工程塑料(聚苯·硫醚、液晶聚合物、聚醚醚酮)、通用热固性树脂(酚醛、聚氨酯、不饱和聚酯树脂、环氧树脂)不同品种的顺序,对树脂的产量、消费量、供需状况及合成工艺、产品应用开发、树脂品种的延伸及应用的进一步扩展等技术作了详细介绍.     

2005～2006年国外塑料工业进展

收集了2005年7月～2006年6月国外塑料工业的相关资料,介绍了2005—2006年国外塑料工业的发展情况。提供了世界塑料产量、消费量及全球各类树脂生产量以及各国塑料制品的进出口情况。作为对比,介绍了中国塑料的生产情况。按通用热塑性树脂（聚乙烯、聚丙烯、聚苯乙烯、聚氯乙烯、ABS树脂）、工程塑料（聚酰胺、聚碳酸酯、聚甲醛、热塑性聚酯、聚苯醚）、通用热固性树脂（酚醛、聚氨酯、不饱和树脂、环氧树脂）、特种工程塑料（聚苯硫醚、液晶聚合物、聚醚醚酮）的品种顺序,对树脂的产量、消费量、供需状况及合成工艺、产品开发、树脂品种的延伸及应用的扩展作了详细的介绍。