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[i=s] 本帖最后由 easylife 于 2010-1-15 13:00 编辑 [/i]% A$ }( X; g; r! ? f: \
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Geometrical Dimensioning and Tolerancing for Design,Manufacturing and Inspection+ ?# g! D, h( @& l0 O5 m0 j t9 k
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Preface
# d, |/ F1 Q0 c/ E+ L3 f# G5 aTechnical developments, leading to higher performance, higher efficiency, lower pollutions+ E; v: l" l' j" T( Y9 ^# Q/ ?" n2 f0 {
and greater reliability, and the constraints imposed by economy and the need for, I. x6 w% |" X" q
rationalization, greater cooperation with licensees and subcontractors, make it necessary
0 @8 X' ~, T7 h: M/ W" kto have completely toleranced drawings suitable for the function, for manufacturing+ p& H4 h; x" h
and inspection.
. l. V2 A) i7 B0 o7 m“Completely toleranced” means that the geometries (form, size, orientation and location)
; j0 g* C( A! A6 X) y1 `2 D/ q% G( `of geometrical elements of the workpiece are completely defined and toleranced.2 l, j& n: W O) ]! \$ R/ G
Nothing shall be left to the individual judgement of the manufacturer or inspector. Only# c% A% V% Z3 ^! w& S5 _
with this approach can proper functioning be verified and the possibilities available for" M3 {3 l; \" ~8 p
economization and rationalization in manufacturing and inspection be fully utilized.
5 l/ h& }/ \5 @This book presents the state of the art regarding geometrical dimensioning and tolerancing.: T4 }$ w7 B" `5 L |
It describes the international standardization in this field, which is laid down
# w( |4 l. ^- Z* Vin ISO Standards. It indicates the deviations between the American Standard ASME, |6 }1 d: Y, t
Y14.5M, the former East European Standards and the ISO Standards. It describes the/ Y7 W9 M/ J; B/ y% y1 n
additional specifications laid down in the German Standards (DIN Standards). Possible# B4 N# Q% P% t2 c
further developments in the field of geometrical tolerancing are also pointed out.
7 ~! X& s( [, T& D/ DWhat has to be regarded for manufacturing within the geometrical dimensioning and, d+ K' W6 J$ p" x
tolerances is explained.
3 s0 |, l1 U$ xPrinciples for the inspection of geometrical deviations are given, together with a" y A/ {- Y" O4 l0 E& `
basis for tolerancing suitable for inspection.* V: O8 V0 K7 m7 A. E
Examples for tolerancing appropriate to various functional requirements, a guide for" L6 v6 ]' ^6 P' f! a
geometrical tolerancing, are described." w. C& m6 c% Z9 q/ S6 z1 F0 |; W
This book may serve as an introduction to geometrical dimensioning and tolerancing! I* W, ]; S7 B& K$ I z
for students, and may also help practitioners in the fields of design, manufacturing
2 P( k! X7 K! G0 F/ ?1 w5 ^$ G; xand inspection.+ a, z( Q" i) Y/ S' r n
The author has used his experiences gathered during the elaboration of the ISO
% p$ D: ?8 k$ k. x3 fStandards and during his lectures and discussions on geometrical dimensioning and tolerancing9 b; ^) h7 Q& b8 i
in industry and education. However, proposals for improvements are appreciated
# D" W% b! z! a( m) H$ L) |% @and should be directed to the publisher.2 _+ L7 v1 g# n9 t" s' v. J1 o
The book represents the author’s understanding of the various standards and is written
9 h5 g! {+ T0 z% ^: q; Zfor educational purposes. In cases of dispute, the original standards have to be
. I c& U1 V7 Jconsidered. The functional cases of geometrical requirements vary over a wide range.3 D6 V' f0 `0 o; T) A. N
Therefore, before application in practice, it should be checked whether the presentation# C4 ~8 I+ d. k
in the book fits the particular purpose in the practical case.; H( m9 s/ m2 Z' t1 P
Standardization is a dynamic and continuous process. The standards follow the v' y) V$ \ H* O
development in engineering. Future changes in standardization may make it necessary4 _$ g0 h2 M8 y, h2 _
to update some content of this book.
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- J- R g' r" ]$ E& YGeorg Henzold was manager of the department for standardization of a manufacturer
& b+ w9 Y. p6 T) K2 D V Q4 `of power plant machinery. He is chairman of the committee dealing with the standardization& H: Y/ ^6 w! [) J$ j+ o9 j6 d4 o
in the field of geometrical dimensioning and tolerancing in the German, l" t; a2 B; P
Standardization Institute (DIN), and he was the former chairman of the pertinent/ ?/ Y2 c& l9 l) }7 @, N
European Committee for Standardization (CEN). He is a long-time delegate in the pertinent o( u0 i. B% N/ r& I7 n) i
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
发表于 2009-11-11 21:39:58
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