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GB/T 20915.2-2007 冲模 弹性体压缩弹簧 第2部分:附件规格

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基本信息
标准名称:冲模 弹性体压缩弹簧 第2部分:附件规格
英文名称:Stamping dies—Elastomer pressure springs—Part 2:Specifiction of Accessories
中标分类: 机械 >> 工艺装备 >> 模具
ICS分类: 机械制造 >> 无屑加工设备 >> 模制设备和铸造设备
发布部门:中华人民共和国国家质量监督检验检疫总局 中国国家标准化管理委员会
发布日期:2007-03-12
实施日期:2007-09-01
首发日期:2007-03-30
作废日期:
主管部门:国家标准化管理委员会
提出单位:中国机械工业联合会
归口单位:全国模具标准化技术委员会(SAC/TC 33)
起草单位:桂桂林电器科学研究所、桂林电子科技大学
起草人:翁史振、廖宏谊、李红英、李捷
出版社:中国标准出版社
出版日期:2007-09-01
页数:平装16开 页数:6, 字数:6千字
计划单号:20051381-T-604
适用范围

本标准的本部分规定了冲模用弹性体压缩弹簧的弹簧环河道正销的尺寸,与GB/T20915.1-2007规定的弹性体压缩弹簧共同使用。

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所属分类: 机械 工艺装备 模具 机械制造 无屑加工设备 模制设备和铸造设备
【英文标准名称】:Hand-heldnonelectricpowertools-Safetyrequirements-Part13:Fastenerdrivingtools;GermanversionEN792-13:2000
【原文标准名称】:手持非电动工具.安全性要求.第13部分:紧固件扳拧工具
【标准号】:EN792-13-2000
【标准状态】:现行
【国别】:
【发布日期】:2001-04
【实施或试行日期】:2001-04-01
【发布单位】:欧洲标准学会(EN)
【起草单位】:
【标准类型】:()
【标准水平】:()
【中文主题词】:
【英文主题词】:
【摘要】:手持非电动工具.安全性要求.第13部分:紧固件扳拧工具
【中国标准分类号】:J47
【国际标准分类号】:25_140_99
【页数】:35P;A4
【正文语种】:英语


【英文标准名称】:TestMethodforObtainingHydrostaticDesignBasisforThermoplasticPipeMaterials
【原文标准名称】:获得热塑性管道材料静水压设计基数的试验方法
【标准号】:ANSI/ASTMD2837-2004
【标准状态】:作废
【国别】:美国
【发布日期】:2004-06-01
【实施或试行日期】:2004-06-01
【发布单位】:美国国家标准学会(ANSI)
【起草单位】:ASTM
【标准类型】:()
【标准水平】:()
【中文主题词】:试验;塑料;热塑性聚合物;管
【英文主题词】:Basis;Design;Hydrostatic;Pipelines;Pipes;Plasticpipes;Plastics;Testing;Thermoplastic;Thermoplasticpolymers
【摘要】:Thistestmethoddescribestwoessentiallyequivalentprocedures:oneforobtainingalong-termhydrostaticstrengthcategorybasedonstress,referredtohereinasthehydrostaticdesignbasis(HDB);andtheotherforobtainingalong-termhydrostaticstrengthcategorybasedonpressure,referredtohereinasthepressuredesignbasis(PDB).TheHDBisbasedonthematerial'slong-termhydrostaticstrength(LTHS),andthePDBisbasedontheproduct'slong-termhydrostaticpressure-strength(LTHS).TheHDBisamaterialpropertyandisobtainedbyevaluatingstressrupturedataderivedfromtestingpipemadefromthesubjectmaterial.ThePDBisaproductspecificpropertythatreflectsnotonlythepropertiesofthematerial(s)fromwhichtheproductismade,butalsotheinfluenceonproductstrengthbyproductdesign,geometry,anddimensionsandbythespecificmethodofmanufacture.ThePDBisobtainedbyevaluatingpressurerupturedata.TheLTHSisdeterminedbyanalyzingstressversustime-to-rupture(thatis,stress-rupture)testdatathatcoveratestingperiodofnotlessthan10000handthatarederivedfromsustainedpressuretestingofpipemadefromthesubjectmaterial.Thedataareanalyzedbylinearregressiontoyieldabest-fitlog-stressversuslogtime-to-failstraight-lineequation.Usingthisequation,thematerial'smeanstrengthatthe100000-hintercept(LTHS)isdeterminedbyextrapolation.TheresultantvalueoftheLTHSdeterminestheHDBstrengthcategorytowhichthematerialisassigned.TheLTHSissimilarlydeterminedexceptthatthedeterminationisbasedonpressureversustimedatathatarederivedfromaparticularproduct.ThecategorizedvalueoftheLTHSisthePDB.AnHDB/PDBisoneofaseriesofpreferredlong-termstrengthvalues.Thistestmethodisapplicabletoallknowntypesofthermoplasticpipematerialsandthermoplasticpipingproducts.Itisalsoapplicableforanypracticaltemperatureandmediumthatyieldsstress-rupturedatathatexhibitanessentiallystraight-linerelationshipwhenplottedonlogstress(pound-forcepersquareinch)orlogpressure(pound-forcepersquarein.gage)versuslogtime-to-fail(hours)coordinates,andforwhichthisstraight-linerelationshipisexpectedtocontinueuninterruptedthroughatleast100000h.Unlesstheexperimentallyobtaineddataapproximateastraightline,whencalculatedusinglog-logcoordinates,itisnotpossibletoassignanHDB/PDBtothematerial.Datathatexhibithighscatterora"knee"(adownwardshift,resultinginasubsequentlysteeperstress-ruptureslopethanindicatedbytheearlierdata)butwhichmeettherequirementsofthistestmethodtendtogivealowerforecastofLTHS/LTHS.Inthecaseofdatathatexhibitexcessivescatterorapronounced"knee,"thelowerconfidencelimitrequirementsofthistestmethodarenotmetandthedataareclassifiedasunsuitableforanalysis.Afundamentalpremiseofthistestmethodisthatwhentheexperimentaldatadefineastraight-linerelationshipinaccordancewiththistestmethod'srequirements,thisstraightlinemaybeassumedtocontinuebeyondtheexperimentalperiod,throughatleast100000h(thetimeinterceptatwhichthematerial'sLTHS/LTHSisdetermined).Inthecaseofpolyethylenepipingmaterials,thistestmethodincludesasupplementalrequirementforthe"validating"ofthisassumption.Nosuchvalidationrequirementsareincludedforothermaterials(seeNote1).Therefore,inalltheseothercases,itisuptotheuserofthistestmethodtodeterminebasedonoutsideinformationwhetherthistestmethodissatisfactoryfortheforecastingofamaterial'sLTHS/LTHSforeachparticularcombinationofinternal/externalenvironmentsandtemperature.
【中国标准分类号】:P94
【国际标准分类号】:23_040_20
【页数】:
【正文语种】:英语