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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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Geometrical Dimensioning and Tolerancing for Design,Manufacturing and Inspection
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Preface0 `# [' \$ x* o1 C
Technical developments, leading to higher performance, higher efficiency, lower pollutions
/ g9 L1 E% R- ]0 ]and greater reliability, and the constraints imposed by economy and the need for
k; _' T" p! m( s) Krationalization, greater cooperation with licensees and subcontractors, make it necessary8 P3 i' m, C) p# i h- C# |
to have completely toleranced drawings suitable for the function, for manufacturing
% F1 G! q3 M5 L% cand inspection.
; w8 Y2 p7 x r$ g& E4 R“Completely toleranced” means that the geometries (form, size, orientation and location)
/ q8 \/ O0 q6 k. b) k! n2 uof geometrical elements of the workpiece are completely defined and toleranced.! r/ f( Q. ^- z2 {
Nothing shall be left to the individual judgement of the manufacturer or inspector. Only1 p: |6 R3 n+ Y* s& j( W
with this approach can proper functioning be verified and the possibilities available for
) G5 ]; w, R" W5 @/ }2 U! D; {economization and rationalization in manufacturing and inspection be fully utilized.
2 K, f- l$ y% M& B3 h# b7 _' XThis book presents the state of the art regarding geometrical dimensioning and tolerancing.
6 P4 A* u3 g ^It describes the international standardization in this field, which is laid down% p1 G7 }7 ~( `+ F" |( E6 U
in ISO Standards. It indicates the deviations between the American Standard ASME* ?* d4 P& m2 [- i8 `9 h! g
Y14.5M, the former East European Standards and the ISO Standards. It describes the
7 A: G3 f8 M1 I0 }additional specifications laid down in the German Standards (DIN Standards). Possible+ A% Y' x7 M5 v! `
further developments in the field of geometrical tolerancing are also pointed out.3 n0 D7 }) q% _( V# i5 }+ p
What has to be regarded for manufacturing within the geometrical dimensioning and3 J" _. k" j' B' u/ |( ?
tolerances is explained." }3 n5 H3 M2 j+ x/ g2 l
Principles for the inspection of geometrical deviations are given, together with a
" z z# J+ H+ k1 D) d4 ybasis for tolerancing suitable for inspection.2 `2 N+ e3 b8 n* r
Examples for tolerancing appropriate to various functional requirements, a guide for7 p" C4 U1 `- e: V5 T) H
geometrical tolerancing, are described.% E2 y9 `7 p' [) I0 ~# P* R
This book may serve as an introduction to geometrical dimensioning and tolerancing
6 U4 m$ C6 n0 F' m. lfor students, and may also help practitioners in the fields of design, manufacturing
5 Z% |! p" }* r7 w3 Tand inspection.
- E5 S0 v6 P; \5 eThe author has used his experiences gathered during the elaboration of the ISO! A/ G: b: L% \3 b! N8 \
Standards and during his lectures and discussions on geometrical dimensioning and tolerancing
$ S- ^" x! G# n0 qin industry and education. However, proposals for improvements are appreciated
$ _9 p8 {. E& B* cand should be directed to the publisher.: X( t: ]9 p# T/ s) p+ w5 V
The book represents the author’s understanding of the various standards and is written
6 p0 @" ^. O% o X0 Rfor educational purposes. In cases of dispute, the original standards have to be
: |& Z+ L& r: P* K5 d- Nconsidered. The functional cases of geometrical requirements vary over a wide range.8 i$ y. B l$ n1 n( g0 i9 Y
Therefore, before application in practice, it should be checked whether the presentation
' ~9 h; f4 C& L/ M# \in the book fits the particular purpose in the practical case.! ~( p: m, f1 _ D& U9 n
Standardization is a dynamic and continuous process. The standards follow the
U+ C( w/ a# U% B N' L- wdevelopment in engineering. Future changes in standardization may make it necessary
; V7 c1 g" h k3 e) E! L- fto update some content of this book.
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Georg Henzold was manager of the department for standardization of a manufacturer) g6 ?% l& o! l: I3 Q
of power plant machinery. He is chairman of the committee dealing with the standardization
8 U% g w/ H; J2 I0 \0 oin the field of geometrical dimensioning and tolerancing in the German
6 |8 d2 j9 L/ VStandardization Institute (DIN), and he was the former chairman of the pertinent
3 d+ L5 F. x4 Y/ EEuropean Committee for Standardization (CEN). He is a long-time delegate in the pertinent
+ v( |1 N8 a& wcommittees of the International Standardization Organization (ISO).: x6 H* J. f) h1 L/ s( X
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Georg Henzold |
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发表于 2009-11-11 20:44:46
