【英文标准名称】:Steeldieforgings.Tolerancesondimensions.Dropandverticalpressforgings
【原文标准名称】:钢模锻.公差和尺寸.落锤或垂直压力锻造
【标准号】:BSEN10243-1-1999
【标准状态】:现行
【国别】:英国
【发布日期】:1999-12-15
【实施或试行日期】:1999-12-15
【发布单位】:英国标准学会(GB-BSI)
【起草单位】:BSI
【标准类型】:()
【标准水平】:()
【中文主题词】:等级(质量);尺寸公差;厚度;表面;缺陷;压制;形状;热加工;非合金钢;平面度测量;重量;标记;尺寸测量;长度;缺陷与故障;孔;设计;合金钢;落锤锻;尺寸;锻件;直线度测量;公差(测量);工程图;宽度;高度;钢
【英文主题词】:Alloysteels;Carbon;Defects;Design;Dimensionalmeasurement;Dimensionaltolerances;Dimensions;Dropforging;Dropforgings;Engineeringdrawings;Flatnessmeasurement;Forgedpieces;Forging;Forgings;Grades(quality);Height;Holes;Hot-working;Length;Marks;Metals;Pressing(forming);Shape;Steelproducts;Steels;Straightnessmeasurement;Surfaces;Symbols;Thickness;Tolerances(measurement);Unalloyedsteels;Weight(mass);Width
【摘要】:1ThisEuropeanStandardspecifiesthedimensionaltolerancesforsteeldropandverticalpressforgingsmadeunderhammersandpresses.ThefirstpartofthisEuropeanStandardappliestohotforgingsinthedeliverycondition,madeincarbonandalloysteels.Thetolerancesspecifiedapplytoforgingsnotexceeding250kginmassor2500mmmaximumdimension.Tolerancesforheavierorlargerforgingsshallbeagreedatthetimeofenquiryandorder.ThisEuropeanStandarddoesnotapplytoupsetforgingsmadeonhorizontalforgingmachines(seeEN10243-2).2ThetolerancesshowninthisEuropeanStandardcoverbothforgingstonormalrequirementsandforgingstoacloserrangeoftolerances.Thesetwogradesoftolerancesareidentifiedasfollows:—forginggradeFwithtolerancesprovidinganadequatestandardofaccuracyforthemajorityofapplicationsandcapableofbeingcompliedwithbycommonlyusedforgingequipmentandproductionmethods;—forginggradeEprovidingclosertolerancestoassistinacommodatingthoseinstancesinwhichthenormalmanufacturingstandardsareinadequate.WhilegradeE(close)tolerancesmaybeappliedtoalldimensionsononeforging,itismoreeconomicaltoapplythemonlytothosespecificdimensionsonwhichclosertolerancesareessential.Thisgradeshouldnotbespecifiedunlesstheadditionalforgingcostentailedcanbejustifiedbyaconsequentsavinginoverallcost.ThetablesshowingdimensionaltolerancesarebasedontheR20seriesofpreferrednumbers(seeISO3).AnnexAgivesforinformationsomeexamplesoftheapplicationofthesetolerancesfordifferenttypesofcloseddieforgings.3Anyoccasionalinstancesmaynecessitatetheuseoftoleranceswiderthanthoseindicated,e.g.speciallycomplicateddesignsandsteelshavingparticularlydifficultforgingcharacteristics.Insuchcasesthesestandardtolerancescanformonlyabasisonwhichtoagreemodificationsappropriatetotheparticularcircumstances.4ThisEuropeanStandarddoesnotincluderangesofspecialtolerancescloserthangradeE.Suchrequirementsusuallynecessitatesupplementaryoperations,e.g.hotorcoldcoiningorspecialprocessessuchaswarmorcoldforging.Considerationsofthisnature,whilstfrequentlyencountered,arehighlyindividual,andvarywidely.Theyarebestdealtwithbyconsultationatthedesignstageandshallbeagreedbetweenthepurchaserandthesupplier.Thisapproachwillensurethatoptimumuseismadeoftheforgingprocessinfulfillingthepurchaser'sspecialrequirementsatthelowestadditionalcost.
【中国标准分类号】:J32
【国际标准分类号】:77_140_85
【页数】:38P.;A4
【正文语种】:英语