帮忙解答关于公差尺寸链的疑惑

图中是配合的两个零件（示意图不必较真），目标是在列出的尺寸基础上，计算图示间隙的尺寸及公差水平。对于定位间隙的处理，请大家伙各抒己见。

我认为可以有这样的思路：图中间隙受两个条件影响，柱孔的gap C和A,B,D,E的制造公差。
1.不考虑公差，也不考虑柱孔组装偏差，则gap=A+B+C-D-E=(A-E)+(B+C-D)=5。
2.增加考虑组装偏差，4.75<gap<5.25
3增加考虑制造公差，分两种情况极限公差和统计公差，极限公差=（0.3+0.2)+(0.1/2+0.1/2+0)=0.6,此时gap的范围是4.15<gap<5.85。统计公差=根号（0.3^2+0.2^2+0.05^2+0.05^2)=0.367，此时gap范围4.383<gap<5.617
（其中C公差为0）

未收录

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关于本问题，个人觉得应该是传动链上公差标注重复了。

我认为可以有这样的思路：图中间隙受两个条件影响，柱孔的gap C和A,B,D,E的制造公差。 1.不考虑公差，也不考虑柱孔组装偏差，则gap=A+B+C-D-E=(A-E)+(B+C-D)=5。 2.增加考虑组装偏差，4.75<gap<5.25 3增加考虑制造公差，分两种情况极限公差和统计公差，极限公差=（0.3+0.2)+(0.1/2+0.1/2+0)=0.6,此时gap的范围是4.15<gap<5.85。统计公差=根号（0.3^2+0.2^2+0.05^2+0.05^2)=0.367，此时gap范围4.383<gap<5.617 （其中C公差为0）

这个解答应该是准确的，但在3。极限公差=（0.3+0.2)+(0.1/2+0.1/2+0)=0.6,感觉这里不应该是1/2.

iDFMA 发表于 2010-2-24 12:52
1.决定定位柱与孔的间隙。

定位柱与孔的间隙、定位柱的尺寸、和孔的尺寸是一个尺寸链。定位柱与孔的间隙需要保证定位柱在装进孔的时候不会发生干涉，至于具体是多少取决于定位柱和孔的所能达到的尺寸精度以及公差 ...

个人认为装配偏移，基本尺寸为0
公差应为+/-[（孔基本尺寸+上偏差）-（轴基本尺寸+下偏差）]/2较为合适。
孔和轴都是在最小实体状态下的尺寸

是一份好料

学习，学习

好复杂， 能总结一下到底应该咋做是标准答案吗？

谁能说一下正确答案呀？

说到这个cetol
就用他来做了一下分析，软件对间隙的处理是：把公称尺寸定为0，公差为0.350，但是他提供几种间隙方式，见图片

分析结果见

发的帖子，不能显示图，怎么能显示图？