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[i=s] 本帖最后由 easylife 于 2010-1-15 13:00 编辑 [/i]* {9 ]* ?3 Z6 S& L# M5 @+ h
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Geometrical Dimensioning and Tolerancing for Design,Manufacturing and Inspection
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2 |) x7 R% U% `: LPreface
. q' I+ c5 B7 y3 R% Y& n% O! j! ATechnical developments, leading to higher performance, higher efficiency, lower pollutions
# Q) t" E4 f2 b# ]; n$ x) Nand greater reliability, and the constraints imposed by economy and the need for
9 d. _, [( [5 s3 T7 K1 O2 Irationalization, greater cooperation with licensees and subcontractors, make it necessary/ l: M1 B& k+ a+ @. o6 t% u
to have completely toleranced drawings suitable for the function, for manufacturing8 L# ~* Z- j* R P6 u
and inspection." f" [+ Z. M t, j. I* A
“Completely toleranced” means that the geometries (form, size, orientation and location), m0 O6 ?; y$ X I
of geometrical elements of the workpiece are completely defined and toleranced.' u2 k8 P* C$ q1 h% z- @
Nothing shall be left to the individual judgement of the manufacturer or inspector. Only) G- b$ q' h4 j L2 K6 \' U
with this approach can proper functioning be verified and the possibilities available for) ^' `- n# d0 E# ?* E; v# F
economization and rationalization in manufacturing and inspection be fully utilized.
! G7 L j" S, a5 n I* h5 k' lThis book presents the state of the art regarding geometrical dimensioning and tolerancing.
8 b7 Y- ]# f/ U4 m2 v: |8 h6 q- {It describes the international standardization in this field, which is laid down1 w- X- v+ K/ ?. j/ w- b5 P$ }6 g
in ISO Standards. It indicates the deviations between the American Standard ASME
; C5 H( V9 F' \/ }Y14.5M, the former East European Standards and the ISO Standards. It describes the! O U$ X: n. ^+ _
additional specifications laid down in the German Standards (DIN Standards). Possible* j- B! ^5 J0 a
further developments in the field of geometrical tolerancing are also pointed out.
5 K U7 z, U% Z' z4 S* i& I6 ?What has to be regarded for manufacturing within the geometrical dimensioning and+ D- ]; }6 X7 s: _. q
tolerances is explained.
7 }' \- R4 b+ a$ S7 ?Principles for the inspection of geometrical deviations are given, together with a2 V) L- R9 {+ V9 O8 M
basis for tolerancing suitable for inspection.
6 ^+ D, F$ I7 X" {& c, rExamples for tolerancing appropriate to various functional requirements, a guide for( K( {6 l& E* ?5 N. i
geometrical tolerancing, are described.
9 T9 z8 ^" B& R: UThis book may serve as an introduction to geometrical dimensioning and tolerancing" `" g# r( h9 Q1 ?- }& _0 ~4 V5 Q% `
for students, and may also help practitioners in the fields of design, manufacturing: W; Z, v& g2 M
and inspection.
1 P7 g7 D1 i) }) t/ r0 Y; h5 ?The author has used his experiences gathered during the elaboration of the ISO
6 g' Z- @" B0 k! f0 M1 _- `+ ~! vStandards and during his lectures and discussions on geometrical dimensioning and tolerancing; d$ }7 Q& o) g5 ^
in industry and education. However, proposals for improvements are appreciated9 m: T& M/ o5 T
and should be directed to the publisher.
) v# m5 w+ E- c1 A) w: }" iThe book represents the author’s understanding of the various standards and is written# b9 P! I3 d: b/ R+ [
for educational purposes. In cases of dispute, the original standards have to be; D k1 Z0 i8 _/ n9 M7 B2 \4 C
considered. The functional cases of geometrical requirements vary over a wide range.( y' q. h& `0 E% T
Therefore, before application in practice, it should be checked whether the presentation
1 ^+ B& k7 ]& t( kin the book fits the particular purpose in the practical case.' I. d8 T0 X' H+ b: Y( \$ y
Standardization is a dynamic and continuous process. The standards follow the. X4 }" f" e. L& v( c! E
development in engineering. Future changes in standardization may make it necessary* J, `2 c# n6 [
to update some content of this book.; Q, j% v/ i# X d
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/ x) c4 M0 ]* @* a/ _Georg Henzold was manager of the department for standardization of a manufacturer
3 A1 I0 y9 E& h5 Lof power plant machinery. He is chairman of the committee dealing with the standardization
% N" J% n( c& K" D) H, o' d2 P8 _& Sin the field of geometrical dimensioning and tolerancing in the German* V( m6 t# m+ ]* H$ `& J
Standardization Institute (DIN), and he was the former chairman of the pertinent
0 X/ t& F1 ^. D, {2 AEuropean Committee for Standardization (CEN). He is a long-time delegate in the pertinent0 V3 e/ D8 g( E1 H; Q9 k- o" a2 F
committees of the International Standardization Organization (ISO).
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% N6 S# T0 V% Z; LGeorg Henzold |
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发表于 2009-11-11 20:44:46
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