简介：筒形件强力旋压是公认的制造大型薄壁筒形件的最有效加工方法之一，用该工艺所得旋压件的精度不逊于切削加工，而且材料利用率和机械性能均优于机加工，已被大量地应用于航空、航天及兵器工业等尖端领域，同时在常规机械、化工、电器、汽车及轻工等民用行业也得到了广泛的应用。

简介：ThesusceptibilityofweldedjointfortheX65pipelinesteeltoH2Sstresscorrosioncracking(SCC)isinvestigated.SCCtestsonthesteelarecarriedoutintheenvironmentbasedonNACETM-01-77solutionwithsaturatedgaseousH2S.Thethresholdstressintensityfactorandcrackpropagationvelocityarecalculatedaccordingtowedge-openingloading(WOL)specimens.Thethree-dimensionalelastic-plasticfiniteelementanalysisofWOLspecimensisperformedbyusingtheFEMprogrammingpackageANSYS.Stressfieldandconcentrationofhydrogendistributionpropertyaheadofthecracktipareobtained.ThispapersurveyedthemicrostructureofweldedjointandstudiedonthemechanicalpropertiesofX65pipelinesteel.Itprovidesexperimentalbasisforstudyingstresscorrosion.Theresultsofnumericalanalysisareconsistentwithconclusionsofstresscorrosiontest.

简介：EA8S是三菱电机新研发的一款放电火花机，主要适用智能性手机、一般用途塑皎模、自动化、接插件、骨位和浇口、硬质合金模板等行业的模具加工。市场定位为普及经济型，在满足精度要求的前提下，最大程度提高加工效率。尤其在大面积加工、石墨电极加工的情况下，加工速度有显著提高。EA8S设备的主要性能有以下特点：

简介：Inthiswork,asimpleandfacileone-potoleylaminesolvothermalsyntheticmethodwasdevelopedtosynthesizeCu_2ZnSnS_4(CZTS)nanocrystals.AndtheCu_2ZnSn(S,Se)_4(CZTSSe)thinfilmswerepreparedbyselenizingCZTSnanocrystals.TheobtainedCZTSnanocrystalsandCZTSSefilmswerestudiedusingX-raydiffraction(XRD),transmissionelectronmicroscopy(TEM),scanningelectronmicroscopy(SEM),energy-dispersiveX-rayspectroscopy(EDX),andultraviolet–visiblespectrophotometer(UV–Vis).TEMresultsshowthatthesphere–likeCZTSnanoparticleswithdiameterbetween12and35nmarepolydispersed.XRDstudiesindicatethatthepreparedCZTSnanocrystalsformkesteritecrystalstructure,andtheCZTSSefilmswithkesteritecrystalstructurearealsoobtainedattheannealingtemperaturesof500and550°C.Inparticularafterannealingat500°Cfor20min,theCZTSSefilmexhibitsasmooth,uniform,crack-free,andlarge-grainedtopographyandpossessesCu-poorandSn-richcomposition.Moreover,itshowsstrongopticalabsorptionfromvisibletonear-infrared(IR)region,anditsopticalbandgap(Eg)isfoundtobeabout1.44eV.

简介：2009年5月10日，由陕西省科学技术厅组织，咸阳市科技局主持，在陕西生益科技有限公司召开了对该公司研制的“S2600E复合基覆铜箔层压板”的科技成果鉴定会。与会专家听取了技术研究报告等相关汇报，进行了资料审查、现场考察、质疑答辩，经充分讨论后鉴定委员会同意该项目通过科技成果鉴定。