《组合体尺寸注法》PPT课件

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1、Basicrequirementsfordimensioning标注尺寸的基本要求Dimensioningofbasicbody,cuttingandinterpenetrationbodies基本体、截切体及相贯体的尺寸注法Dimensioninggeneralcompositesolids组合体的尺寸注法Exercises练习题DimensioningCompositeSolids组合体的尺寸标注请点击相应标题显示其内容Reasonableness:Thedimensionsmustbemarkedaccordingtother

2、equirementsofdesign,manufactureandtest.合理：所注尺寸要符合设计、制造和检验等要求。Basicrequirementsfordimensioning标注尺寸的基本要求Correctness:Thereshouldbenomistakewithalldimensionsandthenationalstandard(GB)shouldbeobserved.正确：尺寸无误，注法符合国标规定。Correctness，integrity，clarity，reasonableness.正确、完整、清晰、合理

3、。请点击鼠标左键显示后面内容Integrity:Thedimensionmustfullydefinethesizeofthepartandtherelativelocationsofindividualcomponents.Itcannotbeskipped,norrepeated.完整：所注尺寸必须能完整确定零件的形状大小及位置,不遗漏,不重复。Clarity:Thearrangementofthedimensionsshouldbeclearandclean.清晰：尺寸布局清晰，便于看图。1.Basicrequirements

4、fordimensioning标注尺寸的基本要求Eachdimensionofthepartshouldmarkonthedrawingonlyonce.Itshouldalsobemarkedonadrawingthatmostclearlyrepresentsthecorrespondingconstructs.机件的每一尺寸,在图上只标注一次,应标注在反映该结构最清晰的图形上。Thetruesizeofthesparepartisbasedonthedimensionmarkedonthedrawingandhasnothin

5、gtodowiththesizeofthedrawingandtheaccuracyofthedrawings.机件的真实大小应以图样上所注的尺寸数值为依据，与图形的大小无关。2)Thereisnoneedtomarktheunitofdimensionsifitis“mm”.Oneonlyneedstomarkthedimensionsiftheunitsarenot“mm”,suchas“cm”or“30º”.图样中尺寸以毫米为单位时,不需标注计量单位的代号或名称。若采用其他单位,则必须注明相应的计量单位的代号或名称,如cm(厘

6、米)、30°(度)等。请点击鼠标左键显示后面内容Basicrequirementsfordimensioning标注尺寸的基本要求2.Basicrulesofdimensioning标注尺寸的基本规定Alldimensionsmarkedonthedrawingaredimensionsofthefinalpart.Otherwiseoneneedstoclearlyindicateonthedrawing.所标注的尺寸数字,应为该图样所示机件的最后完工的尺寸,否则应另加说明。383.Dimensionconstruction尺寸的

7、组成Φ18②Dimensionlineisusuallydrawnperpendiculartotheextensionlinesandtheextensionlinesshouldextendbeyondtheterminalofdimensionlineforabout2－3mm.一般与尺寸线垂直,超出尺寸线终端23mm。Extensionline尺寸界线1428999999①Anextensionlineisdrawnwithacontinuousthinline.Anextensionlineoriginatesfroma

8、featureoutline,anaxisline,oracenterline.为细实线,应从轮廓线、轴线或对称中心线处引出。9Basicrequirementsfordimensioning标注尺寸的基本要求Dimensionlin