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[i=s] 本帖最后由 easylife 于 2010-1-15 13:00 编辑 [/i]
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Geometrical Dimensioning and Tolerancing for Design,Manufacturing and Inspection
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Preface, v! }4 C/ y/ I+ V. [4 B
Technical developments, leading to higher performance, higher efficiency, lower pollutions
# a' L& {4 }# N* i2 aand greater reliability, and the constraints imposed by economy and the need for
( h/ l4 H6 a8 P* a+ |rationalization, greater cooperation with licensees and subcontractors, make it necessary9 @0 B `6 ?4 y& s2 J. }; u& {
to have completely toleranced drawings suitable for the function, for manufacturing" K5 V; A4 e8 a# Q9 g( H* l5 C8 f
and inspection.
$ l3 ~" U+ v/ I1 D“Completely toleranced” means that the geometries (form, size, orientation and location)
$ R) _2 ?; f- I e2 y7 u2 qof geometrical elements of the workpiece are completely defined and toleranced.0 K8 [4 B0 c# V7 Z3 A/ k* K
Nothing shall be left to the individual judgement of the manufacturer or inspector. Only: a8 v& D4 ?) R! x; t' s
with this approach can proper functioning be verified and the possibilities available for
2 h0 Z2 y' a8 ~/ l% Beconomization and rationalization in manufacturing and inspection be fully utilized.5 h6 C+ U' h& D
This book presents the state of the art regarding geometrical dimensioning and tolerancing.
4 }( n2 e; J4 f# K0 ^+ fIt describes the international standardization in this field, which is laid down
4 N: W% t5 I% R! \- Y. ~- y( l# Hin ISO Standards. It indicates the deviations between the American Standard ASME
L5 V6 k. F4 {. E$ rY14.5M, the former East European Standards and the ISO Standards. It describes the
, {' x8 A2 O" L1 tadditional specifications laid down in the German Standards (DIN Standards). Possible) `+ k+ F- B& ~; G+ J
further developments in the field of geometrical tolerancing are also pointed out.( i: H5 _; y' @ F7 a# k
What has to be regarded for manufacturing within the geometrical dimensioning and
. y/ k3 ^2 n Y/ r; f4 ]5 Utolerances is explained.
0 n" X) x9 c0 `# d9 `4 @Principles for the inspection of geometrical deviations are given, together with a; h# j7 F7 x5 X8 F9 H- }
basis for tolerancing suitable for inspection.
5 Y4 z1 h2 K+ B6 k5 mExamples for tolerancing appropriate to various functional requirements, a guide for/ c& o, x; f2 |$ q9 e
geometrical tolerancing, are described.9 D: W* [: s, ]" o
This book may serve as an introduction to geometrical dimensioning and tolerancing6 b1 Q/ z9 X* h. I! h7 j
for students, and may also help practitioners in the fields of design, manufacturing/ b0 k" H0 P( S& u
and inspection.
" Y) ~2 W/ @( P6 \4 hThe author has used his experiences gathered during the elaboration of the ISO
1 I" i4 }0 r8 Z6 T2 r# U# ?Standards and during his lectures and discussions on geometrical dimensioning and tolerancing
0 ~% t6 ~: _8 c) k, G hin industry and education. However, proposals for improvements are appreciated
$ @/ x- U8 t; L8 h; Vand should be directed to the publisher.
- F7 @1 ^/ i3 I$ p" pThe book represents the author’s understanding of the various standards and is written
+ b8 ~- e# _$ Q2 k8 ~6 T3 K6 L3 nfor educational purposes. In cases of dispute, the original standards have to be! a' A2 R. q6 H4 ~5 I- O& O
considered. The functional cases of geometrical requirements vary over a wide range.
4 X: a7 r" C. K4 ^5 c! r8 QTherefore, before application in practice, it should be checked whether the presentation' e1 H% I6 }; i/ v+ f2 L" N+ r
in the book fits the particular purpose in the practical case.$ M$ h. z4 a+ b1 J0 r' r8 [
Standardization is a dynamic and continuous process. The standards follow the$ W3 K9 s5 V- \4 ?4 R7 T
development in engineering. Future changes in standardization may make it necessary( u5 H4 O4 n1 \$ A2 d
to update some content of this book.. L5 U) W5 w3 t' m/ h" i
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Georg Henzold was manager of the department for standardization of a manufacturer
# X2 f1 I$ `* U/ c) {0 Qof power plant machinery. He is chairman of the committee dealing with the standardization% z) p v$ g$ T6 o# |/ ?6 J
in the field of geometrical dimensioning and tolerancing in the German
9 Q; C$ L7 ^( E- E" o1 N. gStandardization Institute (DIN), and he was the former chairman of the pertinent; L6 }) }& `* S7 K
European Committee for Standardization (CEN). He is a long-time delegate in the pertinent
1 ]" W2 q$ b6 J" D$ H: @7 c% ecommittees of the International Standardization Organization (ISO).
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Georg Henzold |
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发表于 2009-11-11 20:44:46
