TB 1539.8-1984 冷冲模导向装置 压板固定滑动导套组合
作者:标准资料网 时间:2024-05-14 22:16:26 浏览:8357
来源:标准资料网
基本信息
| 标准名称： | 冷冲模导向装置 压板固定滑动导套组合 |
| 中标分类： |
机械 >>
工艺装备 >>
模具 |
| 发布日期： | 1984-12-24 |
| 实施日期： | 1985-07-01 |
| 首发日期： | |
| 作废日期： | |
| 出版日期： | |
| 页数： | 1页 |
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所属分类： 机械 工艺装备 模具
Product Code:SAE AMS4154
Title:Aluminum Alloy, Extrusions, 5.6Zn - 2.5Mg - 1.6Cu - 0.23Cr (7075-T6, 7075-T6510, 7075-T6511) Solution Solution Heat Treated, Stress Relieved by Stretching When Required and Precipitation Heat Treated
Issuing Committee:Ams D Nonferrous Alloys Committee
Scope:This specification covers an aluminum alloy in the form of extruded bars, rods, wire, shapes, and tubing.【英文标准名称】:StandardPracticeforStitchesandSeams
【原文标准名称】:针角和缝合的标准实施规程
【标准号】:ASTMD6193-2009
【标准状态】:现行
【国别】:美国
【发布日期】:2009
【实施或试行日期】:
【发布单位】:美国材料与试验协会(US-ASTM)
【起草单位】:D13.54
【标准类型】:(Practice)
【标准水平】:()
【中文主题词】:
【英文主题词】:seams;stitches;textiles
【摘要】:Seamengineering,thedeterminationofthebeststitchtype,seamconfiguration,andthreadtypewhichshouldbeusedforaparticularassembly,requiresathoroughknowledgeofmanyvariables.Theimproperselectionofanyonecomponentcanresultinfailureofthesewnjunction,andultimatelyfailureoftheproductmanufactured.GeneralCharacteristics8212;Thecharacteristicsofaproperlyconstructedsewnseamarestrength,elasticity,durability,security,andappearance.Thesecharacteristicsmustbebalancedwiththepropertiesofthematerialtobejoinedtoformtheoptimumsewnseam.Theenduseoftheitemwillgoverntherelativeimportanceofthesecharacteristics.Theselectionoftheseamtypeandstitchtypeshouldbebasedupontheseconsiderations.Strength8212;Theseamefficiencyofthesewnseamshouldbeashighaspossible.Thiswillproducesewnseamstrengthwithabalancedconstructionthatwillwithstandtheforcesencounteredintheuseofthesewnitem.Theelementsaffectingthestrengthofasewnseamare:Fabrictypeandstrength,Seamtype,Stitchtype,Stitchdensity(spi),Threadtension,andThreadstrength.Elasticity8212;Theelasticityofasewnseamshouldbeslightlygreaterthanthatofthematerialwhichitjoins.Thiswillenablethematerialtosupportitsshareoftheforcesencounteredfortheintendedenduseofthesewnitem.Theelasticityofasewnseamdependsupon:Fabrictypeandstrength,Seamtype,Stitchtype,Stitchdensity(spi),Threadtension,andThreadelasticity.Durability8212;Thedurabilityofasewnseamdependslargelyuponitsstrengthrelativetotheelasticityoftheseamandtheelasticityofthematerial.However,inlesselastic,tightlywovenordensematerials,thereisatendencyforthepliestox201C;workx201D;orslideoneachother.Toformadurablesewnseaminthesetypesoffabrics,thethreadsizemustbecarefullychosen.Thestitchdensityalsoneedstobecarefullydeterminedforthematerialsoasnottocauseexcesstensionwhichwillunbalancetheelasticityandcausepuckering.Itisalsoimportanttominimizeabrasionandwearbycontactwithoutsideagenciestopromotedurability.Security8212;Thesecurityofasewnseamdependschieflyuponthestitchtype,spi,anditssusceptibilitytobecomeunraveled.Thestitchmustbewellsettothematerialtopreventsnaggingthatcancauseruptureofthethreadandunravelingofcertainstitchtypes.Appearance8212;Theappearanceofasewnseamgenerallyisgovernedbytheproperrelationshipbetweenthesizeandtypeofthread,thestitchdensity,andthetextureandweightofthefabric.Inadditiontothesegeneralcharacteristics,thetechniqueandskillofthesewingmachineoperatorsalsogoverntheappearanceofthesewnseams.SomeofthefactorswhichwilladverselyaffecttheappearanceareshowninTable1.TABLE1StitchandSeamDefectsStitchDefectsSeamAssemblynbsp;nbsp;nbsp;DefectsLoosestitches
Puckers
