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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* I! `0 R" Y) k; }
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Preface
; ^9 b5 V8 p i' j% jTechnical developments, leading to higher performance, higher efficiency, lower pollutions
# o) x/ p2 F# C8 n6 K2 \and greater reliability, and the constraints imposed by economy and the need for* w' e3 `# q' r2 P2 R
rationalization, greater cooperation with licensees and subcontractors, make it necessary# s; A: y0 J! [8 h u
to have completely toleranced drawings suitable for the function, for manufacturing
# @( M: j# _0 k U6 D tand inspection.( N" Q e6 w8 ^2 T t- e3 l2 \) p
“Completely toleranced” means that the geometries (form, size, orientation and location)
7 w E; K: B& T* Uof geometrical elements of the workpiece are completely defined and toleranced.
! w( D; B$ W9 }" }0 m+ zNothing shall be left to the individual judgement of the manufacturer or inspector. Only
6 Y" W" ~( D. n& R# I/ d+ [with this approach can proper functioning be verified and the possibilities available for
9 J$ g- Y, v& ~3 ceconomization and rationalization in manufacturing and inspection be fully utilized.# t2 y' H3 R& }( f f; ^ U4 j n
This book presents the state of the art regarding geometrical dimensioning and tolerancing.
$ z* W5 Y6 u5 C: HIt describes the international standardization in this field, which is laid down
' q. N( n) Z. W$ m2 E% [in ISO Standards. It indicates the deviations between the American Standard ASME" G7 i* q0 Q% j" w
Y14.5M, the former East European Standards and the ISO Standards. It describes the. D n: U! d4 }1 p( H. S
additional specifications laid down in the German Standards (DIN Standards). Possible+ Y5 j3 z3 Z6 ]# X0 C
further developments in the field of geometrical tolerancing are also pointed out.9 Z- d O! H$ N6 R
What has to be regarded for manufacturing within the geometrical dimensioning and
/ n" Z6 Q" i) d* `tolerances is explained.
# A1 ]3 A/ y1 d- kPrinciples for the inspection of geometrical deviations are given, together with a0 R1 B: y% x0 C5 S$ D
basis for tolerancing suitable for inspection.
1 ]0 F) k5 Z- v* rExamples for tolerancing appropriate to various functional requirements, a guide for
( c8 l8 p4 Z' J3 V0 V [8 _geometrical tolerancing, are described.
+ ~9 i" F9 o& X+ p! F uThis book may serve as an introduction to geometrical dimensioning and tolerancing
* C4 g; W ?) z! Wfor students, and may also help practitioners in the fields of design, manufacturing
$ m6 Z4 t p. j0 s+ W& q. v: ?and inspection.; P6 [- V5 s: P) T: O% U
The author has used his experiences gathered during the elaboration of the ISO
; e9 S5 [& U! n" v: g2 d5 kStandards and during his lectures and discussions on geometrical dimensioning and tolerancing6 C* e9 r5 s0 o
in industry and education. However, proposals for improvements are appreciated
- i. p3 }$ L# ]# cand should be directed to the publisher.
' y p2 q0 J; w/ w3 [& ]- EThe book represents the author’s understanding of the various standards and is written
4 O3 p6 {% P+ K8 f% Ofor educational purposes. In cases of dispute, the original standards have to be
( @1 C7 ]5 c8 n9 r( v& c0 F5 pconsidered. The functional cases of geometrical requirements vary over a wide range.
" c1 y: ^: C& h2 \: v( _' C1 CTherefore, before application in practice, it should be checked whether the presentation
( q3 i3 s% W0 @$ s0 j0 w2 ein the book fits the particular purpose in the practical case.3 K' A2 k7 a: v8 z2 P. W3 D% y: q
Standardization is a dynamic and continuous process. The standards follow the l9 U7 d8 n2 r1 m# {
development in engineering. Future changes in standardization may make it necessary6 `" n3 b7 Z8 B r
to update some content of this book.' Z& S- ]6 m8 [2 R% m
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9 t8 g& g5 c6 p! m. JGeorg Henzold was manager of the department for standardization of a manufacturer
2 E: ?4 ]0 g# Z! r5 Pof power plant machinery. He is chairman of the committee dealing with the standardization
# U* u% D: N% O8 Z X+ ]in the field of geometrical dimensioning and tolerancing in the German
m8 O$ Z8 M7 T. A3 y- E* HStandardization Institute (DIN), and he was the former chairman of the pertinent
+ y# y9 {$ j, d1 ]* u, |European Committee for Standardization (CEN). He is a long-time delegate in the pertinent
9 J: K1 [( c. G( b4 U A J) dcommittees of the International Standardization Organization (ISO).* a _2 w; C9 w6 f% @6 z: _+ v
9 ]* i. q7 l/ ?/ [( A QGeorg 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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