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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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1 \: e! I, t* F/ K+ i4 N4 a$ f+ C' iGeometrical Dimensioning and Tolerancing for Design,Manufacturing and Inspection+ d/ s# Z4 y3 l
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Preface8 f& c4 w# n: B4 P5 p
Technical developments, leading to higher performance, higher efficiency, lower pollutions! [) y+ w6 c w/ c. q5 A4 x6 D
and greater reliability, and the constraints imposed by economy and the need for
$ b2 L4 s) J1 V5 ~" s3 R" O0 x6 Nrationalization, greater cooperation with licensees and subcontractors, make it necessary. Q& _! S' l! u" \8 ~. U5 x5 v
to have completely toleranced drawings suitable for the function, for manufacturing: U! Z$ Q3 q1 L0 k
and inspection.
`. _" t! v: H4 x“Completely toleranced” means that the geometries (form, size, orientation and location)
* B8 L* j3 c' {" g' g1 Sof geometrical elements of the workpiece are completely defined and toleranced.
5 p7 Q' a I7 V+ C& V' m% U7 q8 yNothing shall be left to the individual judgement of the manufacturer or inspector. Only' G: I9 F( e o
with this approach can proper functioning be verified and the possibilities available for
3 ]! t/ |( `9 M; G7 h% ]4 Meconomization and rationalization in manufacturing and inspection be fully utilized.
/ O! ?1 N; t7 h: DThis book presents the state of the art regarding geometrical dimensioning and tolerancing.
J) l4 ~6 W- R. r# E* K0 S7 XIt describes the international standardization in this field, which is laid down
$ {2 ^. \' r4 ^/ j7 E6 ^+ v9 Min ISO Standards. It indicates the deviations between the American Standard ASME
3 D* d/ \. a& ?1 @$ c: p8 jY14.5M, the former East European Standards and the ISO Standards. It describes the. A0 m. _1 c- C* Q% T0 F
additional specifications laid down in the German Standards (DIN Standards). Possible8 D5 E1 K8 Q2 S6 G
further developments in the field of geometrical tolerancing are also pointed out.
* a4 k# C0 C1 w! F7 k$ K8 |+ x4 nWhat has to be regarded for manufacturing within the geometrical dimensioning and
2 Z: `2 `- c. c3 u' }" u1 Utolerances is explained.$ D1 }6 x1 K( ^1 S3 d4 B8 d; \
Principles for the inspection of geometrical deviations are given, together with a3 Y$ @4 h+ |0 Z2 X0 w
basis for tolerancing suitable for inspection.
$ e; P5 \" y- l! }0 w$ G+ GExamples for tolerancing appropriate to various functional requirements, a guide for$ d# y9 z. t. L. ]" I% h( s( }- g
geometrical tolerancing, are described.
* |4 i! j5 ?9 \: p. W2 WThis book may serve as an introduction to geometrical dimensioning and tolerancing
, ^$ g! Z; E/ T. I$ b h1 qfor students, and may also help practitioners in the fields of design, manufacturing
) U: {/ K0 p! r" }. ~' }; C; zand inspection.8 p% g) F; p7 z- W0 X
The author has used his experiences gathered during the elaboration of the ISO
# |7 a: R% t1 [2 ]! iStandards and during his lectures and discussions on geometrical dimensioning and tolerancing
% w( M/ e8 R' L2 o: i% Min industry and education. However, proposals for improvements are appreciated
0 z: I! U) V5 b, U+ f( e: dand should be directed to the publisher.6 f: J3 p; L6 ^9 T
The book represents the author’s understanding of the various standards and is written/ S) u1 F1 Z- F5 L1 G
for educational purposes. In cases of dispute, the original standards have to be
# p- G' s. i3 T2 d* H) zconsidered. The functional cases of geometrical requirements vary over a wide range.
: r6 |, f6 w! H/ I x2 y/ QTherefore, before application in practice, it should be checked whether the presentation1 [* [4 u0 D% s
in the book fits the particular purpose in the practical case.3 _: c3 h' A* r. a6 t4 T
Standardization is a dynamic and continuous process. The standards follow the
% Q* Y W% a5 Z0 X, m- r* Ndevelopment in engineering. Future changes in standardization may make it necessary, L9 N) d1 X( g, Q" q
to update some content of this book.
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/ S, L$ h* T( w: O& |Georg Henzold was manager of the department for standardization of a manufacturer
+ y' B; K( _4 F i) Wof power plant machinery. He is chairman of the committee dealing with the standardization
3 d( J4 H8 X9 K$ {) [in the field of geometrical dimensioning and tolerancing in the German" L) V7 [) e% d' G6 D, m0 d6 I
Standardization Institute (DIN), and he was the former chairman of the pertinent$ s6 B3 F0 E0 g; j7 e
European Committee for Standardization (CEN). He is a long-time delegate in the pertinent
7 I, H+ F3 ~1 N: z) C: hcommittees of the International Standardization Organization (ISO).4 O6 I9 B1 Y5 u$ s
& X4 H* W/ k/ r% g2 w- NGeorg Henzold |
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