组合体尺寸注法.ppt

Basic requirements for dimensioning
标注尺寸的基本要求

Dimensioning of basic body, cutting and
ration bodies
基本体、截切体及相贯体的尺寸注法
Dimensioning posite solids
组合体的尺寸注法
Exercises
练****题
posite Solids
组合体的尺寸标注
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Reasonableness:The dimensions must be marked according to the requirements of
design, manufacture and test.
合理: 所注尺寸要符合设计、制造和检验等要求。
Basic requirements for dimensioning
标注尺寸的基本要求
Correctness: There should be no mistake with all dimensions and the national
standard (GB) should be observed.
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。
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Integrity : The dimension must fully define the size of the part and the relative
locations of ponents. It can not be skipped, nor repeated.
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 : The arrangement of the dimensions should be clear and clean.
清晰: 尺寸布局清晰,便于看图。
1. Basic requirements for dimensioning 标注尺寸的基本要求
Each dimension of the part should mark on the drawing only once. It should also
be marked on a drawing that most clearly represents the corresponding constructs.
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。
The true size of the spare part is based on the dimension marked on the drawing
and has nothing to do with the size of the drawing and the accuracy of the drawings.
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) There is no need to mark the unit of dimensions if it is “mm”. One only needs to
mark the dimensions if the units are not “mm”, such as “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(厘米) 、 30°(度)等。
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Basic requirements for dimensioning
标注尺寸的基本要求
2. Basic rules of dimensioning 标注尺寸的基本规定
All dimensions marked on the drawing are dimensions of the final part. Otherwise
one needs to clearly indicate on the drawing.
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。
38
construction 尺寸的组成
Φ18
② Dimension line is usually drawn perpendicular to the
extension lines and the extension lines should extend
beyond