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[i=s] 本帖最后由 easylife 于 2010-1-15 13:00 编辑 [/i]
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4 r/ v4 H; w, H' IGeometrical Dimensioning and Tolerancing for Design,Manufacturing and Inspection8 P0 v5 T7 n* c1 X7 Q3 w4 N
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Preface* [) {9 G1 [) G1 o, o* }6 n
Technical developments, leading to higher performance, higher efficiency, lower pollutions
2 } {) L. H! F1 Y% h" Zand greater reliability, and the constraints imposed by economy and the need for
0 V8 } E; [) v% Orationalization, greater cooperation with licensees and subcontractors, make it necessary
9 ?) m9 j ~( O% f5 Kto have completely toleranced drawings suitable for the function, for manufacturing
# r) ^; L o+ r3 i" Hand inspection./ `/ Q S5 Y$ I, q
“Completely toleranced” means that the geometries (form, size, orientation and location)4 \' v8 P: `" N! r) p
of geometrical elements of the workpiece are completely defined and toleranced.
3 ~0 B# D9 ?4 s' bNothing shall be left to the individual judgement of the manufacturer or inspector. Only
" Z" z2 X4 b3 M! H/ Mwith this approach can proper functioning be verified and the possibilities available for
0 g) D8 i- k4 c9 Ieconomization and rationalization in manufacturing and inspection be fully utilized.
( ~7 M; O0 y9 YThis book presents the state of the art regarding geometrical dimensioning and tolerancing.4 a2 V6 m3 Z" q- W, ~5 O5 h
It describes the international standardization in this field, which is laid down
1 }- y3 _: h6 u: Tin ISO Standards. It indicates the deviations between the American Standard ASME& m4 \# W3 Z2 E* f) h
Y14.5M, the former East European Standards and the ISO Standards. It describes the- A5 ^ m, ]! ]6 @5 j
additional specifications laid down in the German Standards (DIN Standards). Possible D. F" d- T) a! n
further developments in the field of geometrical tolerancing are also pointed out." \; L) T- C/ ^+ ~& V" x7 I
What has to be regarded for manufacturing within the geometrical dimensioning and
' [; f- z: A8 n1 htolerances is explained.& o) S0 ]4 a. C2 H2 E- Q
Principles for the inspection of geometrical deviations are given, together with a9 |) V& g) G" Z# h
basis for tolerancing suitable for inspection.
* N# Y* j; U4 ] O2 iExamples for tolerancing appropriate to various functional requirements, a guide for5 x& T) A% Q2 M6 ?* |
geometrical tolerancing, are described.2 @* p. C v% m" @0 K
This book may serve as an introduction to geometrical dimensioning and tolerancing
# }% _, g. _& I; F8 L8 } w' u% _for students, and may also help practitioners in the fields of design, manufacturing F$ B" L5 i" Z) Y2 i8 H
and inspection.- p3 P4 g, B, Y6 v
The author has used his experiences gathered during the elaboration of the ISO
; m+ H9 X0 I+ ?Standards and during his lectures and discussions on geometrical dimensioning and tolerancing# t* r1 T. j. A* \5 t4 w
in industry and education. However, proposals for improvements are appreciated1 }" q2 u$ v$ z; A/ M8 w# F
and should be directed to the publisher.
7 e1 z$ A, w) F! z8 rThe book represents the author’s understanding of the various standards and is written
- t* _) S5 ^& P% k+ ifor educational purposes. In cases of dispute, the original standards have to be
4 K7 j* h) \$ n" @/ bconsidered. The functional cases of geometrical requirements vary over a wide range.
! Y8 V5 k+ d! RTherefore, before application in practice, it should be checked whether the presentation
: x# u7 l% |* @" ~. h; J& l$ `% `8 W8 Ein the book fits the particular purpose in the practical case.
3 }! { W" W6 K9 ]; d4 lStandardization is a dynamic and continuous process. The standards follow the
! \" o& n. U$ u& N* Odevelopment in engineering. Future changes in standardization may make it necessary
+ s9 h- p) Y' n! r2 P% H0 L1 H7 Oto update some content of this book.1 `5 H3 P; H, P1 j9 y* z
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Georg Henzold was manager of the department for standardization of a manufacturer
$ h5 J1 d$ a( L5 F* oof power plant machinery. He is chairman of the committee dealing with the standardization
9 r6 F# U& C1 U) Gin the field of geometrical dimensioning and tolerancing in the German
- ^- m1 J% P1 N" f4 kStandardization Institute (DIN), and he was the former chairman of the pertinent
, [+ v1 q+ H' q$ |European Committee for Standardization (CEN). He is a long-time delegate in the pertinent
6 O8 J; h+ Q, {6 ucommittees of the International Standardization Organization (ISO).6 V I: j! b# D/ }( C
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Georg Henzold |
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发表于 2009-11-11 20:44:46
