本帖最后由 aysuio 于 2015-10-7 05:08 编辑 ( ?* z$ ~* s& s2 L8 L/ z+ @! \
ValleyViews 发表于 2015-10-7 02:44 
& r& V( V* D P: X+ t: t. |直线度是可以在某些平面上指定的。既然在平面上可以指定，就是可以应用在平面上的。ASME Y14.5 中的图 Fi ...
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大侠，别用您啦，小子真担待不起，我是小弟：D i D# |+ V0 |2 t8 |6 w+ z7 g
大侠这么认真，小子自然很愿意来跟大侠说一下。
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In Y14.5
1 h# f1 r6 `6 U, a) qApplication:
) S6 t3 Z" E0 d% s! v `) [1. Straightness tolerance specifies a tolerance zone within which the EACH (This word is not in the standard, but the following explanations indicate the "EACH" information) considered element in the surface or derived median line must lie.
$ j- P1 R* c" e% k1 t$ P" w2. Straightness tolerance is applied in the view where the elements to be controlled are represented by a straight line.9 {+ I& ^; d0 P* _
6 v: W/ L0 P0 q& U; V% [These 2 sentences give us 3 information:1 `0 f1 ]6 R2 G/ N, J2 Q
1. straightness tolerance controls each line elements of a surface when it is applied to the surface, or the derived median line when it is applied to the feature of size.3 H. m2 m( h+ f! j
2. Straightness tolerance is ONLY applied in ONE VIEW where it refers to.! r( i9 }! u( b) K. g" }) b
3. Straightness tolerances is applied to a nominal straight line. If the line is a curve, please use profile tolerance.
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For this problem, straightness tolerance is applied to the surface, and in 2 VIEWS.
6 k2 T j2 |2 V' _So it means 2 straightness tolerance control the straightness of each line elements of the surface in 2 VIEWS.% |( e0 d3 t0 ]) z1 U% ^* W
Line element is a 2D element, like it just has dimensions in X and Y, and NEVER think about you can measure line elements in Z axis. What you do is just to measure the line one by one according to the actual local sizes of the component (Means the straightness tolerance zone totally depends on the actual local sizes of your produced part)$ [- l+ d/ z+ k3 h
When you talk about the flatness tolerance. This is a 3D element. I.E. it has dimesions in X,Y,Z. So when you check the tolerance, you check the whole surface at the SAME TIME where the flatness tolerance refers to.8 |, q3 }+ U6 f( i( n& {9 N
; D% p- o/ r" F( C, jThis is why the straightness tolerance in that figure which I posted before can be 0, but the flatness tolerance can reach 0.6! y4 D( {, R: M I+ K8 c L! `
If you still have any problem about this, please read the standard again from the first sentence of form tolerance section, then I think you will understand about this problem clearly and thoroughly. : b4 B% @- v- W. F& n9 U v
/ S& |& w$ u* \1 T+ {9 l# PIf you are willing to talk with me about the problem, feel free to contact me  I'm here with you. |
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发表于 2015-10-6 16:23:14
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