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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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; L6 i* L9 e+ C% u8 F! ^# fGeometrical Dimensioning and Tolerancing for Design,Manufacturing and Inspection @- ~- y9 ~! e
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9 g3 j! P+ X' l2 |0 sPreface8 k o+ K4 j2 Q- b# H5 \: k
Technical developments, leading to higher performance, higher efficiency, lower pollutions
: ?, B% P: v) s0 X" K2 Iand greater reliability, and the constraints imposed by economy and the need for
8 X/ V8 [+ O5 rrationalization, greater cooperation with licensees and subcontractors, make it necessary. {5 D" X8 [. o8 H: k6 t4 s4 Y
to have completely toleranced drawings suitable for the function, for manufacturing
4 C ~# I' m5 Nand inspection.! D) Z/ B1 Q5 y
“Completely toleranced” means that the geometries (form, size, orientation and location)
2 K- f( D9 C" |1 V1 c" L1 eof geometrical elements of the workpiece are completely defined and toleranced.1 ]) J6 N& D/ H
Nothing shall be left to the individual judgement of the manufacturer or inspector. Only6 W+ t4 C9 ]- D: G
with this approach can proper functioning be verified and the possibilities available for
7 U% R" x$ z: p* H1 d! k( E' Ieconomization and rationalization in manufacturing and inspection be fully utilized.
5 q! u6 ^2 w& z! r8 ^; m5 dThis book presents the state of the art regarding geometrical dimensioning and tolerancing.
& @0 U8 {+ i5 u' r. x! NIt describes the international standardization in this field, which is laid down
3 ~4 e* k2 F! yin ISO Standards. It indicates the deviations between the American Standard ASME
' |( T) G- h3 t; JY14.5M, the former East European Standards and the ISO Standards. It describes the
" k$ ] j8 T) `: ` dadditional specifications laid down in the German Standards (DIN Standards). Possible
) `* n) k) @. U6 Xfurther developments in the field of geometrical tolerancing are also pointed out.8 q+ ^" T) |9 U
What has to be regarded for manufacturing within the geometrical dimensioning and0 |5 P9 X$ l+ Z2 l
tolerances is explained.
8 O* u( P4 v# m9 p1 ^Principles for the inspection of geometrical deviations are given, together with a
3 z) S1 [, Z4 Nbasis for tolerancing suitable for inspection.
/ g: k% Y/ T" u9 J( ?. V( oExamples for tolerancing appropriate to various functional requirements, a guide for
/ f( y3 }6 i# h+ S, jgeometrical tolerancing, are described.
3 P" h0 M" u, q3 m) Y* XThis book may serve as an introduction to geometrical dimensioning and tolerancing. i7 A' f. k$ e0 s) N3 d* G
for students, and may also help practitioners in the fields of design, manufacturing; l( Q; o! L- K& n! n+ u$ F
and inspection., r/ S" x, [+ b3 y; m
The author has used his experiences gathered during the elaboration of the ISO
; r; R* O; J2 q' @6 g# MStandards and during his lectures and discussions on geometrical dimensioning and tolerancing( ]2 t# t, E9 d) N% q% U
in industry and education. However, proposals for improvements are appreciated
0 {/ q' B3 d1 f+ h3 Yand should be directed to the publisher.
; F( F6 }: z9 _/ _" vThe book represents the author’s understanding of the various standards and is written
% G, D3 w8 e+ Bfor educational purposes. In cases of dispute, the original standards have to be
5 K. R3 M) \7 P! U! ^1 s& bconsidered. The functional cases of geometrical requirements vary over a wide range.: E5 k& E+ W. r$ Q
Therefore, before application in practice, it should be checked whether the presentation& w3 z& c. ^. g3 A0 H3 m! F
in the book fits the particular purpose in the practical case.$ }" j6 w3 B5 i: H7 ^9 b
Standardization is a dynamic and continuous process. The standards follow the
* y/ y; R" e5 p4 Ldevelopment in engineering. Future changes in standardization may make it necessary7 w1 r2 w* D( l4 @5 ^8 s* I3 E
to update some content of this book.
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8 ^& M0 [/ ^2 ^: TGeorg Henzold was manager of the department for standardization of a manufacturer
: v7 K$ D7 y/ Q1 n2 iof power plant machinery. He is chairman of the committee dealing with the standardization# G/ L+ k9 o5 h' [" A
in the field of geometrical dimensioning and tolerancing in the German
) \; h( W# y w- B }5 jStandardization Institute (DIN), and he was the former chairman of the pertinent# U" Q3 l1 h3 C* M; Y% m
European Committee for Standardization (CEN). He is a long-time delegate in the pertinent/ k0 y q: P0 v- V
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
