精铸铝模常见问题对PCR轮胎质量的影响及解决措施

模具在使用维护中常产生商标标识不匹配、精铸铝花纹块表面状况差、钢圈与侧板配合不好、排气不畅、花纹块分型处钢片弯曲与脱落等问题,致使半钢轮胎产生外观字体不美观、表面粗糙、胶边、圆角、缺胶等外观缺陷,严重影响了半钢轮胎的外观质量。现就精铸铝模常见问题对PCR轮胎质量的影响及     

轮胎模具铝花纹块加工的新工艺

随着机械加工的发展,轮胎模具制造企业铝花纹块的加工工艺已经趋于落后。然而花纹块的质量将直接影响到轮胎产品的质量。因此提高花纹块的产品质量和改善加工工艺,显得尤为重要。提供了一种全新的取得专利的铝花纹块加工工艺,解决了花纹块的倾斜、变形,提高了产品质量、工作效率以及模具的寿命。     

全钢子午线轮胎活络模具传热性能分析

根据实际温模载荷,利用有限元分析软件对9. 00R20和12. 00R20全钢子午线轮胎活络模具进行传热模拟分析。结果表明:原模具花纹块表面上侧温度比下侧温度高,最高温度出现在花纹块中间偏上位置;弓形座角度减小,花纹块表面温差增大;改变上盖闭滑板结构、中套气室位置、花纹块与弓形座配合方式及弓形座材料,花纹块表面温差变化不大,但是花纹块厚度对花纹块表面温差影响较大。     

一种轮胎活络模具花纹块通用组装装置

正由山东豪迈机械科技股份有限公司申请的专利(公开号CN 105171986B,公开日期2018-01-09)"一种轮胎活络模具花纹块通用组装装置",涉及的轮胎活络模具花纹块通用组装装置,属于模具技术领域。该装置包括用于固定花纹块的模壳,模壳与花纹块之间设有若干块衬板,衬板可拆卸安装于模壳的内表面,衬板的内表面与花纹块的外表面相适配。本发明通用性强,能够满足多种规格结构花纹块的连接、紧固、定位及多种项目检测等功能,节省了投入成本,广泛应用于轮     

轮胎模具中铝花纹圈加工新工艺

阐述了铝花纹圈新的加工工艺,既铸造时采取单块铸造,每块花纹块增加工艺基准,利用胎具单块粗、精铣,使花纹块的倾斜量不再超差,把每个花纹块都控制在同一标准内,保证了花纹圈的圆度,从而保证了轮胎的动平衡及各项技术指标,同时解决了花纹块铸造氧化层加工时容易被破坏的问题。     

斜平面轮胎活络模具中套汽室的硫化温度场的模拟分析

采用Abaqus软件对斜平面X1188轮胎活络模具（简称斜平面轮胎模具）中套汽室的硫化温度场进行了模拟分析。结果表明：斜平面轮胎模具单温中套汽室对应的型腔花纹块内表面上侧温度比下侧温度略高，最高温度出现在花纹块内表面中间；在保持单温中套汽室初始温度条件的基础上采用多温中套汽室时，花纹块内表面温差减小，温度分布更加均匀；对花纹块上下肩部进行倒角结构优化后，花纹块内表面温差进一步降低，温度场更加集中于花纹块内表面中间且分布更为均匀，同时花纹块使用的材料减少，从而可在保证轮胎硫化温度的条件下降低经济成本。     

子午线轮胎活络模铝花块研制简讯

活络模是生产子午线轮胎所必需的专用设备,其中铝花块则是活络模的关键零件,因为需要由它来保证轮胎的外形和尺寸精度。铝花块由于花纹形状非常复杂,尺寸精度及表面光洁度要求很高,用一般传统的生产手段是难以生产的。美国、西德、日本、意大利等工业先进的国家均采用了石膏型精密铸造工艺方法来生产铝花块,但其具体工艺诀窍均极端保密。     

子午线轮胎活络模花纹块的加工方法

活络模花纹块是成型轮胎胎面花纹部分的重要部件,其花纹样式复杂多变,花纹块的加工质量直接影响到轮胎圆度、动平衡及表面的美观,本文针对不同材料不同花纹类型的花纹块加工方法及工艺等方面进行了分类和阐述。     

轮胎花纹块模具型腔数控加工研究

轮胎花纹的参数化设计是轮胎制造中的技术难题,首先分析了平面二维花纹图向轮胎表面映射的关键技术,并给出了具体的算法。对花纹曲线的构建和轮胎胎面花纹的三维造型等提出了相应的解决思路。经实验,造型结果显示该方法可以有效地构造轮胎花纹的形状,适用于轮胎花纹块模具型腔数控加工,具有较强的工程实践和推广意义。     

3D扫描技术在轮胎模具检测中的应用

针对轮胎活络模花纹块表面复杂的几何设计,传统手段已经无法满足轮胎模具的检测要求。采用手持式激光扫描仪获取活络块成型表面的点云数据,在Geomagic Qualify软件中对点云数据进行有效处理,通过测量和比对分析判断活络块模具的变形和磨损程度,从而达到模具检测的目的。本工作可为解决轮胎模具检测难题提供有效的参考。     

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。