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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* K* i& l- O" }! g W; s% I
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Preface
9 u: f6 I, N5 R! {% cTechnical developments, leading to higher performance, higher efficiency, lower pollutions6 O+ o' p: b# c p1 f' o9 V. V
and greater reliability, and the constraints imposed by economy and the need for6 M' J: t) Z2 d# R" a
rationalization, greater cooperation with licensees and subcontractors, make it necessary
) G4 ~, g& L: t; k ]4 Ito have completely toleranced drawings suitable for the function, for manufacturing
+ L9 O7 ^! P7 P5 e& ^and inspection.+ N" Y- ? H- B) H
“Completely toleranced” means that the geometries (form, size, orientation and location): b8 h; `; H: A, y! l7 J q
of geometrical elements of the workpiece are completely defined and toleranced.
( }6 E* q( B" B; u- fNothing shall be left to the individual judgement of the manufacturer or inspector. Only$ n* y% e/ s' v2 d
with this approach can proper functioning be verified and the possibilities available for
$ p0 Z3 |2 P/ I* jeconomization and rationalization in manufacturing and inspection be fully utilized.
* V3 G1 i+ o2 n5 |% DThis book presents the state of the art regarding geometrical dimensioning and tolerancing.6 C7 j6 L& Q8 Q6 T2 V
It describes the international standardization in this field, which is laid down
2 U5 b2 N% H( \% Q& Din ISO Standards. It indicates the deviations between the American Standard ASME0 K$ M5 \9 M0 N3 P1 g& K8 S& p2 a
Y14.5M, the former East European Standards and the ISO Standards. It describes the
4 J k+ O* J+ a8 Y( N! V& iadditional specifications laid down in the German Standards (DIN Standards). Possible
. K |' U/ D9 F. N0 n5 Ufurther developments in the field of geometrical tolerancing are also pointed out.
. [$ ]$ R9 b, H' s, t* rWhat has to be regarded for manufacturing within the geometrical dimensioning and6 l1 O, P7 ?+ z* @
tolerances is explained./ }; G" x) W2 S; G6 q8 R! C, C
Principles for the inspection of geometrical deviations are given, together with a( \4 D$ k1 _! J, [$ H% S$ b
basis for tolerancing suitable for inspection.
; v' m7 y9 n, D( o6 H7 ^) N8 RExamples for tolerancing appropriate to various functional requirements, a guide for" d9 ]5 `2 N( ~0 r. Q, X
geometrical tolerancing, are described.
2 k/ m: }# L; {# V+ C; KThis book may serve as an introduction to geometrical dimensioning and tolerancing0 C4 `8 L6 _" t. }2 ^
for students, and may also help practitioners in the fields of design, manufacturing2 k# `" Q# Y% K9 w, {! P( n
and inspection./ {' O; s* ^) R2 _+ b5 A
The author has used his experiences gathered during the elaboration of the ISO' V( s1 c/ F5 R6 U2 {6 P9 d
Standards and during his lectures and discussions on geometrical dimensioning and tolerancing* d7 i! n( x0 @5 J4 M: T8 N3 _
in industry and education. However, proposals for improvements are appreciated6 z6 w7 j, [+ Y4 V- L6 [# `/ [5 M
and should be directed to the publisher.
+ h" B4 ]/ ~, n9 M- c3 |0 d. EThe book represents the author’s understanding of the various standards and is written% v7 @) n! j* Y# R9 w) Y# [
for educational purposes. In cases of dispute, the original standards have to be
5 g( R8 [! N. ]$ w% ], oconsidered. The functional cases of geometrical requirements vary over a wide range.
3 x7 k) O& s* q: j lTherefore, before application in practice, it should be checked whether the presentation' m- L: }( |/ t/ X
in the book fits the particular purpose in the practical case.
# `( i F4 D& h; k. Y6 LStandardization is a dynamic and continuous process. The standards follow the. I$ _& p/ S b- ?
development in engineering. Future changes in standardization may make it necessary7 r& Y3 b! I& E* F: G7 s6 j8 L- q
to update some content of this book.
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% q0 u1 p: P. F2 i9 l! ?Georg Henzold was manager of the department for standardization of a manufacturer' v- X* Z i3 n( Z: g! F7 }
of power plant machinery. He is chairman of the committee dealing with the standardization
9 W5 F$ X5 S2 Hin the field of geometrical dimensioning and tolerancing in the German* y) X1 ~! H- Y$ S/ S4 }3 C& s9 v
Standardization Institute (DIN), and he was the former chairman of the pertinent
/ M2 \9 ^2 z4 x: BEuropean Committee for Standardization (CEN). He is a long-time delegate in the pertinent* z* Z# Y @: D
committees 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
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