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[i=s] 本帖最后由 easylife 于 2010-1-15 13:00 編輯 [/i]
9 Z9 x' B. m! L i! {2 z
& y1 y2 x/ q5 J2 EGeometrical Dimensioning and Tolerancing for Design,Manufacturing and Inspection8 R5 l* A U" P
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Preface
4 f) m/ _2 q! r5 S3 w; cTechnical developments, leading to higher performance, higher efficiency, lower pollutions
4 \3 `: |' N" W+ b2 U# fand greater reliability, and the constraints imposed by economy and the need for |* m/ c% @3 B0 A- L2 I
rationalization, greater cooperation with licensees and subcontractors, make it necessary4 G+ A' M- \5 Z- X0 q
to have completely toleranced drawings suitable for the function, for manufacturing1 _% @; j5 @0 [* h/ A0 [ g+ D
and inspection.
3 M j2 u) G6 x0 K“Completely toleranced” means that the geometries (form, size, orientation and location)
! I/ }, ^5 \# Z U0 P* X& cof geometrical elements of the workpiece are completely defined and toleranced.
. _, L, `2 k; H- J4 INothing shall be left to the individual judgement of the manufacturer or inspector. Only
, E/ `, M- v5 w) _with this approach can proper functioning be verified and the possibilities available for
I1 _: q( l' ?1 neconomization and rationalization in manufacturing and inspection be fully utilized.
, @8 J( s$ [+ Q( j, F. yThis book presents the state of the art regarding geometrical dimensioning and tolerancing.
, F: V+ R" v( F/ R/ G# pIt describes the international standardization in this field, which is laid down) g ~- s5 J4 G
in ISO Standards. It indicates the deviations between the American Standard ASME
- C7 b; m& I6 ]! k- }Y14.5M, the former East European Standards and the ISO Standards. It describes the; M, X/ A% J1 C8 M
additional specifications laid down in the German Standards (DIN Standards). Possible* k5 _) E0 P# T- Y, L- b6 y N4 e
further developments in the field of geometrical tolerancing are also pointed out.$ Z$ F% n2 ~7 e) Y9 u- ]% V
What has to be regarded for manufacturing within the geometrical dimensioning and+ d0 L0 w0 y+ i% S
tolerances is explained.! H) J+ J& Y( u' S5 ]) j$ g
Principles for the inspection of geometrical deviations are given, together with a
) h/ j0 L$ B s) ~& Y9 ~! Qbasis for tolerancing suitable for inspection.* B: r$ p, `. @( b
Examples for tolerancing appropriate to various functional requirements, a guide for
0 I6 L! @" |/ R. N) z; F) ~2 Egeometrical tolerancing, are described.1 `" Z2 G0 [6 j* Z/ ^9 O, W# j
This book may serve as an introduction to geometrical dimensioning and tolerancing
5 y+ E4 \' M/ }. x2 W$ pfor students, and may also help practitioners in the fields of design, manufacturing7 A; v( `/ o U4 G* u! o% m; E
and inspection.
4 R& v, `: C: Y8 P" ^0 x- nThe author has used his experiences gathered during the elaboration of the ISO
% d# d `, V: X: A9 qStandards and during his lectures and discussions on geometrical dimensioning and tolerancing
9 L- S( I! n2 J' L/ [+ }+ S b5 x8 h0 Qin industry and education. However, proposals for improvements are appreciated* ? T t; T- `& {/ A
and should be directed to the publisher.
7 X; p7 b+ D: F0 H" dThe book represents the author’s understanding of the various standards and is written. }% F0 S8 k. ^( p- N0 P8 {
for educational purposes. In cases of dispute, the original standards have to be
& }+ l# ~' Z# H9 A2 v$ m B1 oconsidered. The functional cases of geometrical requirements vary over a wide range.8 O6 ^0 C2 o" \: f, n+ I
Therefore, before application in practice, it should be checked whether the presentation
9 Q$ w: x7 L4 y6 O9 Oin the book fits the particular purpose in the practical case.' r8 W9 Z# w9 ]$ G5 N
Standardization is a dynamic and continuous process. The standards follow the
: C5 M) \: Z* u4 k% s- f0 S$ zdevelopment in engineering. Future changes in standardization may make it necessary
N8 b! m) i6 v1 X8 R2 E: _" }to update some content of this book.% _& s j5 s; ?$ d
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Georg Henzold was manager of the department for standardization of a manufacturer# t8 F9 x$ O2 N8 M
of power plant machinery. He is chairman of the committee dealing with the standardization
7 z% c+ X5 o8 n' f9 gin the field of geometrical dimensioning and tolerancing in the German+ v; p7 ^% d' p
Standardization Institute (DIN), and he was the former chairman of the pertinent
! Y( Z) }3 W& s. M% [' IEuropean Committee for Standardization (CEN). He is a long-time delegate in the pertinent9 _0 _% W1 T" i7 G |
committees of the International Standardization Organization (ISO).+ g% Y: Z3 z4 X" N
' Z0 ^( C( _3 d2 b+ j( GGeorg Henzold |
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