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發(fā)表于 2015-10-7 04:58:26
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本帖最后由 aysuio 于 2015-10-7 05:08 編輯 6 B% X5 m" s. b6 i
ValleyViews 發(fā)表于 2015-10-7 02:44 ![]()
( T/ F2 _/ }% O直線度是可以在某些平面上指定的。既然在平面上可以指定，就是可以應(yīng)用在平面上的。ASME Y14.5 中的圖 Fi ...
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大俠，別用您啦，小子真擔(dān)待不起，我是小弟：D
- `0 r. Q) a4 C大俠這么認(rèn)真，小子自然很愿意來跟大俠說一下。
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In Y14.5
8 Q, o2 u) H4 B3 O' K' R+ @7 ~Application: 4 A6 H: C5 F5 _8 o$ V+ y
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.
, u- P* o: s) e. ]+ {2. Straightness tolerance is applied in the view where the elements to be controlled are represented by a straight line.$ @3 G, p0 I+ z5 U
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These 2 sentences give us 3 information:1 w: d& ^2 z" x$ M* U1 f
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./ e3 {/ D3 g, B
2. Straightness tolerance is ONLY applied in ONE VIEW where it refers to.
( u1 M- ~& N, F t+ F; w+ ~3. Straightness tolerances is applied to a nominal straight line. If the line is a curve, please use profile tolerance. k# T" I) @* k
) }2 j2 F6 ~- ?: DFor this problem, straightness tolerance is applied to the surface, and in 2 VIEWS.
4 H; }) ?2 V2 ]So it means 2 straightness tolerance control the straightness of each line elements of the surface in 2 VIEWS.
* r8 P9 R, q& v% U3 Z0 _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)
0 Z+ X* G: ^. Q O) eWhen 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.
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This is why the straightness tolerance in that figure which I posted before can be 0, but the flatness tolerance can reach 0.6
) G" p4 M) f7 Y) OIf 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. 5 s0 e+ ^; E# r( Y- h8 Y' R
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If you are willing to talk with me about the problem, feel free to contact me  I'm here with you. |
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樓主: aysuio
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