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[i=s] 本帖最后由 easylife 于 2010-1-15 13:00 编辑 [/i]5 i% N' o6 z4 @1 ^2 E# d
! J+ c/ O/ [5 bGeometrical Dimensioning and Tolerancing for Design,Manufacturing and Inspection
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Preface
; H; Q& T+ C4 M3 s; I/ o0 e; }Technical developments, leading to higher performance, higher efficiency, lower pollutions
d( y* o o$ u4 ]- x _) a4 }' k7 Iand greater reliability, and the constraints imposed by economy and the need for9 S4 O' X+ q. ]+ R" E! O' r
rationalization, greater cooperation with licensees and subcontractors, make it necessary
, c9 [0 G. E/ `# W; xto have completely toleranced drawings suitable for the function, for manufacturing1 I9 I1 L% G7 j
and inspection.
1 z# }, A' B E' R“Completely toleranced” means that the geometries (form, size, orientation and location)
5 J1 c( m) G y0 I* ]3 G }5 vof geometrical elements of the workpiece are completely defined and toleranced.
9 g4 K& d# e0 t& ]Nothing shall be left to the individual judgement of the manufacturer or inspector. Only
% {/ U% ~* U7 i5 c% S) J1 @with this approach can proper functioning be verified and the possibilities available for1 A+ B) B% s" w* M! j
economization and rationalization in manufacturing and inspection be fully utilized.* d' y$ q3 N f% |, j+ f) {
This book presents the state of the art regarding geometrical dimensioning and tolerancing.
8 E2 {" V7 b! lIt describes the international standardization in this field, which is laid down# e. T: K' U) R& f0 c
in ISO Standards. It indicates the deviations between the American Standard ASME
1 m: G4 Q. m( d0 |* sY14.5M, the former East European Standards and the ISO Standards. It describes the' E9 Q) Y/ M# B/ }; w3 W* [: Q6 y
additional specifications laid down in the German Standards (DIN Standards). Possible7 U! L( V( @% F$ I2 v2 n& N
further developments in the field of geometrical tolerancing are also pointed out.
! Z/ C. Z% ]: T7 V! LWhat has to be regarded for manufacturing within the geometrical dimensioning and
9 J7 O' j$ ^/ @$ B6 }tolerances is explained.
4 B* P; [9 A, B4 A5 e6 PPrinciples for the inspection of geometrical deviations are given, together with a
7 O& |- Y& x2 o" P# a7 ?: Q: d5 abasis for tolerancing suitable for inspection.
6 ]) T/ _& B' B, K1 n/ UExamples for tolerancing appropriate to various functional requirements, a guide for
1 [! \2 \" T0 X% ~$ qgeometrical tolerancing, are described.
# A, a, Y; q& y5 y9 b, RThis book may serve as an introduction to geometrical dimensioning and tolerancing
5 W' K7 E) _4 I7 S6 c8 ~1 @for students, and may also help practitioners in the fields of design, manufacturing
4 S O3 ?6 P+ tand inspection.
; s- _) I- _; {$ ~5 IThe author has used his experiences gathered during the elaboration of the ISO
9 J1 x2 a* j% e) y5 h! \4 pStandards and during his lectures and discussions on geometrical dimensioning and tolerancing
9 W! p5 z& M% B0 o8 ] Vin industry and education. However, proposals for improvements are appreciated
4 ]" X" H6 n# a6 D& l7 [$ }5 Wand should be directed to the publisher.
1 y# i( q& C* q3 [% ]8 L1 TThe book represents the author’s understanding of the various standards and is written7 q4 P% b$ F) f' g
for educational purposes. In cases of dispute, the original standards have to be
3 M3 ]9 I0 j5 m" `: G$ U: N& Rconsidered. The functional cases of geometrical requirements vary over a wide range.. [8 S1 O# q1 f% ^
Therefore, before application in practice, it should be checked whether the presentation
# l: O1 u4 |" ^3 p7 \: qin the book fits the particular purpose in the practical case.# h: T. f; ~5 {7 c# v8 {
Standardization is a dynamic and continuous process. The standards follow the
. p# J5 Y0 ]8 L) rdevelopment in engineering. Future changes in standardization may make it necessary( Q$ x6 ?# c' H( Z0 r9 R
to update some content of this book.
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) l1 K- x% s$ _4 x+ A5 YGeorg Henzold was manager of the department for standardization of a manufacturer
" D8 }. }8 s) m6 Rof power plant machinery. He is chairman of the committee dealing with the standardization
# k& L6 s8 W3 t) {, {in the field of geometrical dimensioning and tolerancing in the German
/ m( ]0 y2 x+ B5 M( {3 bStandardization Institute (DIN), and he was the former chairman of the pertinent
- H7 V2 o# n/ VEuropean Committee for Standardization (CEN). He is a long-time delegate in the pertinent
0 }* |$ i k; ^7 C2 Ucommittees of the International Standardization Organization (ISO).
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( h$ r% C$ _5 \& c! U$ }Georg Henzold |
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发表于 2009-11-11 20:44:46
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