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[i=s] 本帖最后由 easylife 于 2010-1-15 13:00 编辑 [/i]5 z1 ]* O) z: ]) u& K
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Geometrical Dimensioning and Tolerancing for Design,Manufacturing and Inspection+ U& ?: l- ], z7 e( S
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Preface* E* D& H( ]3 ^/ J
Technical developments, leading to higher performance, higher efficiency, lower pollutions) f+ p9 |) R, t E) D5 b' N' U0 `1 a
and greater reliability, and the constraints imposed by economy and the need for. s- _/ h0 ?& H8 V- V$ N
rationalization, greater cooperation with licensees and subcontractors, make it necessary2 w1 C, s- ]! t5 J: t
to have completely toleranced drawings suitable for the function, for manufacturing8 T- n9 i7 s/ ?
and inspection.
* r. x* [( H6 l“Completely toleranced” means that the geometries (form, size, orientation and location)+ T; h v+ {" |
of geometrical elements of the workpiece are completely defined and toleranced.' {/ p+ x) I/ {4 ~8 N& z) V
Nothing shall be left to the individual judgement of the manufacturer or inspector. Only9 j {3 e. r4 d; S9 }% d3 b
with this approach can proper functioning be verified and the possibilities available for
2 S, L) g8 ?1 ]1 F, L4 \economization and rationalization in manufacturing and inspection be fully utilized.9 t' r. B+ I6 \8 W
This book presents the state of the art regarding geometrical dimensioning and tolerancing.
& k+ d3 H# K! XIt describes the international standardization in this field, which is laid down" S( e- m! W" g& g
in ISO Standards. It indicates the deviations between the American Standard ASME
) a7 J9 k8 A% G9 t! c; ?* F p: q3 gY14.5M, the former East European Standards and the ISO Standards. It describes the+ `% x ~0 S( P* Y4 s1 @
additional specifications laid down in the German Standards (DIN Standards). Possible
0 ~1 ]# L" b9 }, @! K0 cfurther developments in the field of geometrical tolerancing are also pointed out.
$ M( h* a* ~3 | `What has to be regarded for manufacturing within the geometrical dimensioning and+ I' p+ |. F8 T6 e
tolerances is explained.
9 X6 i5 g2 a( P2 C- vPrinciples for the inspection of geometrical deviations are given, together with a5 h8 a) D' B& |* _- n% W2 ^5 B
basis for tolerancing suitable for inspection.: |+ D0 C$ Y4 D S) [7 [
Examples for tolerancing appropriate to various functional requirements, a guide for
2 U+ o; F& O& ageometrical tolerancing, are described.) o, v. E* q1 }/ ]/ u
This book may serve as an introduction to geometrical dimensioning and tolerancing" O/ z5 L+ _* V6 ~
for students, and may also help practitioners in the fields of design, manufacturing
% l% @7 I2 v; }9 U+ gand inspection.2 f U9 c. E v3 Q& R7 k% ?$ r
The author has used his experiences gathered during the elaboration of the ISO
* L8 c8 j& I1 k6 Z, DStandards and during his lectures and discussions on geometrical dimensioning and tolerancing
- [5 B6 _6 [3 O1 j. ?in industry and education. However, proposals for improvements are appreciated
5 z: H6 X, i, q# B' z+ B( D9 Tand should be directed to the publisher.3 r) l3 i- V& J. q! Z
The book represents the author’s understanding of the various standards and is written7 D2 j2 f( B" X1 x% H) l' M1 w
for educational purposes. In cases of dispute, the original standards have to be
+ C- ^# t) `' Mconsidered. The functional cases of geometrical requirements vary over a wide range.
' t0 k' J; i1 K; X+ J6 xTherefore, before application in practice, it should be checked whether the presentation) e. S' R% c& H
in the book fits the particular purpose in the practical case.
" Y# z$ ~1 N+ f$ dStandardization is a dynamic and continuous process. The standards follow the/ t5 G! Q6 g5 ?+ @ v$ I. i5 t
development in engineering. Future changes in standardization may make it necessary+ o* l+ ?2 Y6 D ?0 [* Q
to update some content of this book.
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9 s5 F8 Z1 {& p% eGeorg Henzold was manager of the department for standardization of a manufacturer4 s8 {/ Y( K7 `
of power plant machinery. He is chairman of the committee dealing with the standardization& L5 Q) E8 D+ n% o
in the field of geometrical dimensioning and tolerancing in the German5 z0 N" a" g* q) }" g
Standardization Institute (DIN), and he was the former chairman of the pertinent, y$ k( W+ ^; V: _5 A: h- `/ E
European Committee for Standardization (CEN). He is a long-time delegate in the pertinent& ?7 o0 N$ m' g$ k
committees of the International Standardization Organization (ISO).
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Georg Henzold |
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发表于 2009-11-11 20:44:46
