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[i=s] 本帖最后由 easylife 于 2010-1-15 13:00 編輯 [/i]5 C! F) [+ }1 S9 u, U6 S
! m7 K/ {9 R1 e" g3 r9 j8 _% V/ cGeometrical Dimensioning and Tolerancing for Design,Manufacturing and Inspection
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Preface
$ W R+ o3 R! }) _% wTechnical developments, leading to higher performance, higher efficiency, lower pollutions7 [ g- }5 a, N9 a" l7 Z
and greater reliability, and the constraints imposed by economy and the need for7 q2 b7 I3 I6 ^' s( d7 _
rationalization, greater cooperation with licensees and subcontractors, make it necessary6 H7 a: d* ^3 n( X: x
to have completely toleranced drawings suitable for the function, for manufacturing
) z* h9 F5 l. r9 o8 Band inspection.
. n" Y" _2 c% }, b“Completely toleranced” means that the geometries (form, size, orientation and location)# ~1 k8 O4 d+ E2 I
of geometrical elements of the workpiece are completely defined and toleranced.
# @( V$ H Q3 G2 q' X; ]/ p. O. D9 uNothing shall be left to the individual judgement of the manufacturer or inspector. Only
; Y5 @# N" T C3 s2 M$ ^8 q. {with this approach can proper functioning be verified and the possibilities available for+ P4 D4 m/ c; C0 G
economization and rationalization in manufacturing and inspection be fully utilized.& s% W v3 i" U0 B' i* J4 M6 ]: \$ }% L
This book presents the state of the art regarding geometrical dimensioning and tolerancing.2 Q4 f0 U8 ?! F/ k6 i. T) ~
It describes the international standardization in this field, which is laid down
* y, N1 H. F6 Jin ISO Standards. It indicates the deviations between the American Standard ASME
) s2 H4 P1 _: s9 T9 G& ^5 P1 YY14.5M, the former East European Standards and the ISO Standards. It describes the
5 f% L# E7 S5 }6 z! ~* P/ ~4 Padditional specifications laid down in the German Standards (DIN Standards). Possible& ^+ ], k; z/ ?/ P
further developments in the field of geometrical tolerancing are also pointed out.0 S2 j0 }$ ~' j7 U- X
What has to be regarded for manufacturing within the geometrical dimensioning and
: A2 u2 f" T) N. p$ f/ z' a; rtolerances is explained.* G! q r" N+ O4 n0 ]
Principles for the inspection of geometrical deviations are given, together with a0 T$ O; ~$ f0 p% E/ a g
basis for tolerancing suitable for inspection.
8 \& H: w! R6 \& J: p' F$ I9 @! M: RExamples for tolerancing appropriate to various functional requirements, a guide for! K+ {1 x. u7 D! e1 o8 |. o( H
geometrical tolerancing, are described.% S* Z& g4 i2 w" y8 m6 s# R
This book may serve as an introduction to geometrical dimensioning and tolerancing
6 C/ {6 }! X$ K9 O4 Z2 \0 {for students, and may also help practitioners in the fields of design, manufacturing( Q4 d& f5 a) M/ Z. I* }
and inspection.1 q+ j' o7 p* B, K
The author has used his experiences gathered during the elaboration of the ISO0 \0 X8 `5 P1 M# u* L. e/ ~
Standards and during his lectures and discussions on geometrical dimensioning and tolerancing/ F9 f' _4 C9 q8 W' C) U3 R! M
in industry and education. However, proposals for improvements are appreciated( J/ L8 _8 A' X) g
and should be directed to the publisher.* ~0 q: h! j n$ [0 B; i* w
The book represents the author’s understanding of the various standards and is written
+ R7 E3 @: [; Zfor educational purposes. In cases of dispute, the original standards have to be
4 W; g* X/ g$ h7 j) E1 K' hconsidered. The functional cases of geometrical requirements vary over a wide range. y' H+ ~2 V9 ~
Therefore, before application in practice, it should be checked whether the presentation
" U% `: X" W. A% l3 t- }in the book fits the particular purpose in the practical case.
; j* }6 f9 K: S. ?2 lStandardization is a dynamic and continuous process. The standards follow the s5 B/ v% n! q: I( L0 X* S" d
development in engineering. Future changes in standardization may make it necessary
: O" k) \$ Y- o% E/ H& n5 uto update some content of this book.
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& Z- |/ x3 m0 T4 \: ?& ~ AGeorg Henzold was manager of the department for standardization of a manufacturer
6 R7 i6 T5 B. j; a- cof power plant machinery. He is chairman of the committee dealing with the standardization
, E; L. n7 ?& s( | U" T# Tin the field of geometrical dimensioning and tolerancing in the German
" C) C( k! ?8 V; [ M7 N4 PStandardization Institute (DIN), and he was the former chairman of the pertinent6 ^, }* q* U) `2 l5 b& ~
European Committee for Standardization (CEN). He is a long-time delegate in the pertinent
4 P1 c& q5 f, t4 _3 D0 D0 pcommittees of the International Standardization Organization (ISO).' r& Y2 M0 M9 L9 }0 L8 \
" m( Z3 S7 x: D; s0 S2 y o1 y9 `Georg Henzold |
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