机械模具数控加工制造技术分析

文章首先简要阐述了数控加工技术的优势,在此基础上对数控加工技术在机械模具制造中的具体应用进行分析,在模具加工制造中,机械模具制造加工技术具有相当重要的作用,本文介绍了机械模具数控加工中提出的要求并展望了机械模具制造数控加工技术的发展趋势。期望通过本文的研究能够对促进数控加工技术在模具制造业中的推广应用有所帮助。     

数控电火花多轴联动斜向加工在模具加工中的应用

介绍了模具加工中运用数控电火花多轴联动斜向加工方法的实例，列出了典型的数控加工程序，并对应用实例的技巧之处做了详细的分析，是模具企业数控电火花加工值得借鉴的加工方法。     

机械加工技术中数控加工的应用

随着我国的制造行业的迅速发展,一些新型的制造加工技术也得到了广泛应用,大大提高了制造的效率和质量。机械加工制造过程中,通过将数控加工制造技术科学应用,就成为保障制造加工质量的基础。本文主要就机械加工技术中数控加工应用重要性和优化策略加以阐述,然后就机械加工技术中数控加工的应用和发展方向详细探究。     

数控车床刀尖圆弧半径补偿的应用及分析

本文以数控加工中,数控车床刀尖圆弧半径补偿在实际加工中的应用进行分析,通过分析数控车削加工过程中刀尖圆弧半径的影响,列出在不同情况下对实际加工精度影响。给出了在各种不同加工情况下出现误差的应对方法。     

浅谈变齿厚蜗杆的数控车加工技术

随着我国经济发展水平的不断提高,数控机床技术得到显著发展,通过使用机床的宏程序功能以及螺纹加工循环的指令能够对走刀路径进行合理安排,能够充分解决导程大带来的不便,还能充分解决大模数蜗杆在数控车加工中遇到的问题。本文主要对变齿厚蜗杆的数控车加工技术进行了分析,对应用数控车加工变齿厚蜗杆中存在的问题进行了论述,从而表现变齿厚蜗杆加工的重要意义。     

MasterCAM在模具设计和加工中的应用

本文通过对计算机鼠标前面板的凸模进行三雏造型设计和数控加工的实例。给出了型面三维造型设计和数控加工技术相结合在模具制造中的应用步骤，在加工中针对加工模具零件的特点，选用了先进的数控加工工艺，从而保证零件的加工质量和加工效率，充分发挥数控机床的优点，提高企业的经济效益和生产水平。     

基于Nx6.0和VERICUT的数控加工仿真应用

数控仿真是数控加工模拟虚拟环境中的反映,能为产品的可制造性分析提供关键数据。在对手机电极实际零件数控加工的基础上,介绍了以NX6.0和VERICUT软件相结合作为仿真平台。实现加工刀位轨迹仿真和机床仿真同步实现。结合手机电极的加工实例实现了数控加工仿真的全过程。为复杂曲面零件的生产提供了有力依据。     

车胎模具制造数控加工技术的应用

介绍了数控加工技术的特点,近年数控加工技术在制造业中的广泛应用,数控机床向高速化、高精度、集成化、多轴化方向发展,数控加工技术为机械加工工艺过程自动化是实现优质、高效、降低成本的重要技术措施,为车胎模具制造自动化提供了装备上的保证,介绍了本企业数控加工技术在车胎模具制造中的相关应用。     

如何提高数控机床在模具加工中的地位——数控加工技术在模具制造中的应用

介绍了利用UG软件编制一般模具数控加工程序的过程，分析了模具加工的一般工艺，对其数控加工中的难点进行了详细的分析，并探讨了UG软件中MANUFACTURING模组的应用。     

变坐标系法加工局部复杂曲面工艺研究

主要阐述了模具加工中局部复杂曲面的加工工艺,即通过应用专用工装改变局部复杂曲面与刀轴间的相对位置,并应用CAM软件编程生成数控加工程序,实现在普通三轴数控铣床上加工复杂曲面的目的,达到简化加工工艺,节约加工成本,提高企业经济效益的目的。     

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。