建議開(kāi)設(shè)：GD&T 幾何尺寸和公差專版

datafield

如果說(shuō)工程圖,，是工程師交流的語(yǔ)言,；
那么,，GD&T,，就是語(yǔ)法,。
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$ I- O  x# K! ]$ G在大學(xué)里學(xué)的GB機(jī)械制圖,，相當(dāng)于學(xué)了四則運(yùn)算,；這在一般的日常生活里，是已經(jīng)夠用了,，但效率不高,，易出錯(cuò)。

憨老馬

寶龍 發(fā)表于 2011-8-7 20:49
其實(shí) 我想說(shuō)的是  這里怎么沒(méi)有人討論GD&T的話題? 是大家不重視嗎?還是大家都是精通的行家了? 圖紙都按照標(biāo) ...

9 C  U! F, O% F& c�,�,！人人都如樓主這么認(rèn)真的話，那該多好,。

昨天我給單位的同事發(fā)了個(gè)電郵,，內(nèi)容是：
$ e( o: n7 W2 m: n& ^' n: h3 }有關(guān)力學(xué)（以及其他）的計(jì)量單位，我國(guó)早在1986年就已經(jīng)修訂過(guò),，廢除了一批國(guó)際上已經(jīng)過(guò)時(shí)的名稱與表示符號(hào),。請(qǐng)你們以后在工作中多注意，否則容易會(huì)被人有其他想法,，起碼覺(jué)得我們不規(guī)范,！

, [' `% D, t: j/ T1 V$ E/ b; l電郵中我舉出實(shí)例，但還有人不服氣,，說(shuō)看到很多人（地方）還在用,，那該怎么辦！

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這些文件是我當(dāng)年在國(guó)企任職“標(biāo)準(zhǔn)計(jì)量室”時(shí)的,，帶了20多年了,。當(dāng)看到有不規(guī)范的，像吃了蒼蠅般惡心�,�,！
這是否就是人家所厭惡的“固執(zhí)”了呢：http://bbs.cmiw.cn/forum.php?mod=viewthread&tid=270309！,？

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喀秋莎

) b/ {* w- [& w. RGeometric Dimensioning and Tolerancing (GD&T) is a language used on mechanical engineering drawings composed of symbols that are used to efficiently and accurately communicate geometry requirements for associated features on components and assemblies. GD&T is, and has been, successfully used for many years in the automotive, aerospace, electronic and the commercial design and manufacturing industries.In today's modern and technically advanced design, engineering and manufacturing world, effective and accurate communication is required to ensure successful end products. Currently, ASME Y14.5-2009 is the accepted geometric dimensioning and tolerancing standard superseding ANSI Y14.5M-1994 used within the USA and ISO 1101-2004 is used outside of the the USA.Success oriented industries and organizations which, require accurate and common lines of communications between engineering, design, manufacturing and quality should consider geometric dimensioning and tolerancing (GD&T) as their mechanical drawing standard. Some advantages of GD&T (geometric dimensioning and tolerancing) are;
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$ C7 g8 e! Z. J1.Provides a clear and concise technique for defining a reference coordinate system (datum's) on a component or assembly to be used throughout the manufacturing and inspection processes.
9 B$ l9 ^+ `  X5 q  m3 n8 R! b2.Proper application of geometric dimensioning closely dovetails accepted and logical mechanical design process and design for manufacturing considerations.
3.Geometric dimensioning dramatically reduces the need for drawing notes to describe complex geometry requirements on a component or assembly by the use of standard symbology that accurately and quickly defines design, manufacturing and inspection requirements.
4.GD&T concepts such as MMC (maximum material condition) when applied properly will facilitate and simplify the design of cost saving functional check gages, manufacturing fixtures and jigs.
The following ar common reasons one should apply GD&T principles:
6 X' T" G$ J: U' q1.Part features are critical to function or interchangeability.
2.When functional gauging techniques are desired.
: [  N2 k! [& w" S8 m, }7 ^, t% Z3.When a common reference (origin) or datum is required to ensure communication is consistent between design, manufacturing and inspection.
4.When a standard interpretation or tolerance is not already implied.
5.Simplify tolerance analysis.
) |  [) h. e3 P4 j  v* B6.Replace complex or long geometry requirement description notes with a single geometric symbol.

原諒我今天

憨老馬 發(fā)表于 2012-7-20 10:44
! _9 Z9 J& y6 b�,。∪巳硕既鐦侵鬟@么認(rèn)真的話，那該多好,。
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5 ~* r) ~7 O; [! T昨天我給單位的同事發(fā)了個(gè)電郵,，內(nèi)容是：

# x# `; \9 p* h- J  現(xiàn)在國(guó)內(nèi)基本上整個(gè)行業(yè)都浮躁的一塌糊涂。一些最基本的準(zhǔn)則都沒(méi)人在意了,。以前,，我們只是技術(shù)上落后，但起碼大家還是認(rèn)認(rèn)真真的按規(guī)范做事,，現(xiàn)在,，我們連標(biāo)準(zhǔn)和規(guī)范都落后了，沒(méi)幾個(gè)人考慮這些了,�,？纯匆郧耙恍﹪�(guó)企的圖紙，再跟現(xiàn)在的比一下,，感覺(jué)就是在倒退,。從企業(yè)到個(gè)人，幾乎都把工程設(shè)計(jì)的一些基本原則丟掉了,。美國(guó)人的優(yōu)勢(shì)在于高速的創(chuàng)新,，德國(guó)人的優(yōu)勢(shì)在于認(rèn)真，我們呢,？看看整個(gè)行業(yè)的現(xiàn)狀,，真讓人傷心。

機(jī)械神話

從圖紙標(biāo)注公差來(lái)看,，公差標(biāo)注確實(shí)很重要,，GD&T確實(shí)解釋得很清楚了，論壇不少版塊都以后討論,，討論了幾年了,。
1 l2 k# m# G$ L: ^) l; P我感覺(jué)是，GD&T懂60%就夠了,，再多就純粹是玩數(shù)學(xué)了,，是質(zhì)檢的人在玩設(shè)計(jì)的人。

從機(jī)械設(shè)計(jì)來(lái)說(shuō),，圖紙公差的標(biāo)注的重要性應(yīng)該不是最重要的的,，原理設(shè)計(jì)，材料,，功能實(shí)現(xiàn)遠(yuǎn)比他重要,。當(dāng)然，硬是較真,，圖紙公差也沒(méi)有什么不重要的理由,。

5 l9 C: m$ b3 _- E很多初始設(shè)計(jì),，是根本不標(biāo)公差或者忽略公差的，機(jī)器造出來(lái)了,，原理實(shí)驗(yàn)了，后續(xù)內(nèi)容才是如何設(shè)定合理公差,，或者補(bǔ)充或者根據(jù)實(shí)際調(diào)試結(jié)果,。
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# j) B  Z- N. A+ B+ |8 @. f無(wú)論如何，GD&T是非常重要的基礎(chǔ)知識(shí),。

tanghb712226

俺嚴(yán)重同意樓主的觀點(diǎn),！GD&T很重要，很有用,。

愛(ài)讓我們?cè)谝黄?/a>

來(lái)看看學(xué)習(xí)一下

zzxj

賺積分

wepjin

這個(gè)是什么

dong_huike

強(qiáng)烈支持樓主建議,；