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[i=s] 本帖最后由 easylife 于 2010-1-15 13:00 編輯 [/i]
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) t% f5 P. M! g: N. d. N DGeometrical Dimensioning and Tolerancing for Design,Manufacturing and Inspection! }: b. I' Y; i: t M5 V7 F) _
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Preface. o/ t0 t t/ _* ^
Technical developments, leading to higher performance, higher efficiency, lower pollutions
: a7 ?3 z+ b: A9 Uand greater reliability, and the constraints imposed by economy and the need for
1 @$ |9 P2 _9 i& s& {5 b/ G xrationalization, greater cooperation with licensees and subcontractors, make it necessary% _1 w$ h* H- ~/ C: i* y
to have completely toleranced drawings suitable for the function, for manufacturing% e% z' S- v% P' I0 L9 c
and inspection.
1 A& @2 g) x- u+ N“Completely toleranced” means that the geometries (form, size, orientation and location)
6 L; G) b3 {" X( L1 D8 uof geometrical elements of the workpiece are completely defined and toleranced.
3 T$ u0 V" J9 @+ }8 F; UNothing shall be left to the individual judgement of the manufacturer or inspector. Only+ w2 s. g/ e" G3 p% [9 V+ M; Y
with this approach can proper functioning be verified and the possibilities available for/ `# [, ^+ v3 o5 e
economization and rationalization in manufacturing and inspection be fully utilized.. d& f: m! S' z% Q
This book presents the state of the art regarding geometrical dimensioning and tolerancing.
; _: k' u; `/ G5 Y( ~& T& QIt describes the international standardization in this field, which is laid down
) y" \* B0 L* ~$ i. u0 Z O0 I6 T) min ISO Standards. It indicates the deviations between the American Standard ASME
0 f. H6 ?+ d) vY14.5M, the former East European Standards and the ISO Standards. It describes the
6 g8 ~5 U5 ?6 oadditional specifications laid down in the German Standards (DIN Standards). Possible$ w+ a0 i/ p% s) _' Z
further developments in the field of geometrical tolerancing are also pointed out.
% |6 G6 I0 ?1 k$ n+ a3 QWhat has to be regarded for manufacturing within the geometrical dimensioning and' q S$ x ~% w+ V2 Q
tolerances is explained.
! Z- ~3 O% b( ]& r' y8 SPrinciples for the inspection of geometrical deviations are given, together with a. [4 E n$ U, r" n
basis for tolerancing suitable for inspection.
9 M8 X d/ S$ r" T, BExamples for tolerancing appropriate to various functional requirements, a guide for
0 D- v5 S4 x; V0 _' L" Igeometrical tolerancing, are described.; c# C& |) F( F3 Y- R
This book may serve as an introduction to geometrical dimensioning and tolerancing4 h* R: }. R+ d H& l
for students, and may also help practitioners in the fields of design, manufacturing4 ^ |8 v1 ?6 { Z
and inspection.% k8 Q+ R( S2 R
The author has used his experiences gathered during the elaboration of the ISO; B8 k3 C' `+ J5 {; \; W3 g& e5 V
Standards and during his lectures and discussions on geometrical dimensioning and tolerancing
3 k# N- G: h ~2 V- ~in industry and education. However, proposals for improvements are appreciated" v; f/ @8 i' g+ |* J% r
and should be directed to the publisher." [/ w+ b% s# O% F# |
The book represents the author’s understanding of the various standards and is written% `) [ f. e& T; X! X0 ^- ?
for educational purposes. In cases of dispute, the original standards have to be+ U3 c5 S1 [' _9 \, m/ s
considered. The functional cases of geometrical requirements vary over a wide range. U4 U. x o4 ]% O8 k5 f$ E5 R
Therefore, before application in practice, it should be checked whether the presentation
9 C$ {% M) S, @' qin the book fits the particular purpose in the practical case.+ r7 o% ?2 _# T7 h* ]* `- p7 K
Standardization is a dynamic and continuous process. The standards follow the
- @1 T$ M' X9 x) c5 ydevelopment in engineering. Future changes in standardization may make it necessary8 L4 s+ F# n, o3 `0 R' N: ?
to update some content of this book.3 A) d8 ~5 ]4 ] C& O s+ E
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Georg Henzold was manager of the department for standardization of a manufacturer2 t( K1 n: |% E% l
of power plant machinery. He is chairman of the committee dealing with the standardization
3 S* m( G. s u4 |, d" l8 [in the field of geometrical dimensioning and tolerancing in the German% o9 D9 d+ ^+ l" b9 K* H
Standardization Institute (DIN), and he was the former chairman of the pertinent
. X1 e; @; w1 P1 [5 K nEuropean Committee for Standardization (CEN). He is a long-time delegate in the pertinent/ [7 L" V9 ~0 J" `+ e8 j
committees of the International Standardization Organization (ISO).! ~2 h I7 Y' Q3 E
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Georg Henzold |
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