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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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+ g7 U/ {$ f( s6 q8 n2 jGeometrical Dimensioning and Tolerancing for Design,Manufacturing and Inspection
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Preface3 T3 j, G K- V( S- ^8 d9 k
Technical developments, leading to higher performance, higher efficiency, lower pollutions
& C& }5 P0 x$ z9 rand greater reliability, and the constraints imposed by economy and the need for; E! Z! C/ t2 Z
rationalization, greater cooperation with licensees and subcontractors, make it necessary5 m' Q2 l. P$ L* i3 Z' ?+ s
to have completely toleranced drawings suitable for the function, for manufacturing
& j' _1 I2 `( Q3 k4 Q7 ~) dand inspection.
- N) c' h! L P( B0 L“Completely toleranced” means that the geometries (form, size, orientation and location)( R s! ]' A. |0 T# K, i$ k/ j
of geometrical elements of the workpiece are completely defined and toleranced.
$ b: T% j2 K7 b+ v; ?( x: pNothing shall be left to the individual judgement of the manufacturer or inspector. Only- E% H P$ G6 Z; Y' `8 W
with this approach can proper functioning be verified and the possibilities available for" e6 Z6 ^3 y1 T- W
economization and rationalization in manufacturing and inspection be fully utilized.
3 b9 P5 W5 N5 P0 K+ t4 ~This book presents the state of the art regarding geometrical dimensioning and tolerancing.6 z: r7 V+ P4 A- H. k! B" B8 P$ v
It describes the international standardization in this field, which is laid down
$ d$ I) d2 }2 k* C% min ISO Standards. It indicates the deviations between the American Standard ASME' H* V) W6 B4 B( k
Y14.5M, the former East European Standards and the ISO Standards. It describes the( ^$ T' R7 v @4 Z
additional specifications laid down in the German Standards (DIN Standards). Possible, R) P* V9 d& M- ~- [1 u2 w4 C0 ?' m
further developments in the field of geometrical tolerancing are also pointed out.$ m" A, p& G ]" P F0 s; t9 s8 _
What has to be regarded for manufacturing within the geometrical dimensioning and1 W$ L2 F) k% q; H: t2 y* P9 E, ~
tolerances is explained.# v1 F! O4 ^5 [( y% N) z- H
Principles for the inspection of geometrical deviations are given, together with a
" w$ r9 a2 T- o) o. g/ P# Rbasis for tolerancing suitable for inspection.
# n3 Y, P, ~2 S" H5 M1 Z# i1 H6 [Examples for tolerancing appropriate to various functional requirements, a guide for* l1 Z6 A5 p0 I
geometrical tolerancing, are described.! L f) W; j6 ^$ b' K+ E6 i
This book may serve as an introduction to geometrical dimensioning and tolerancing. W/ T3 D) f- V& x& [. t+ p% z# e
for students, and may also help practitioners in the fields of design, manufacturing
. F0 l0 Q0 D1 w% x4 gand inspection.
2 W4 j, s6 Q' O _1 e8 ?The author has used his experiences gathered during the elaboration of the ISO
# ` h) g' d. rStandards and during his lectures and discussions on geometrical dimensioning and tolerancing
( g. E( L- G9 d2 p9 Jin industry and education. However, proposals for improvements are appreciated
0 L% _" c* R% Y- B; eand should be directed to the publisher.4 o9 ] R+ T2 G0 M
The book represents the author’s understanding of the various standards and is written9 v3 u! Q7 I" c+ ]
for educational purposes. In cases of dispute, the original standards have to be
6 Z2 T/ {: n3 Z+ |considered. The functional cases of geometrical requirements vary over a wide range.
# d4 `. k3 }$ p8 H+ L- E/ NTherefore, before application in practice, it should be checked whether the presentation% U7 l; ^5 J/ ]' b2 b& {
in the book fits the particular purpose in the practical case. X& K2 Z8 L2 a
Standardization is a dynamic and continuous process. The standards follow the
+ S, ~7 a" o6 b7 O9 X2 O7 Idevelopment in engineering. Future changes in standardization may make it necessary
; I0 ^) R& |# C6 {0 S" t! d1 tto update some content of this book.
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# f9 W8 B: `- L& K& j" f3 m( CGeorg Henzold was manager of the department for standardization of a manufacturer" s5 y4 e- d3 c
of power plant machinery. He is chairman of the committee dealing with the standardization( i/ I6 y0 \- _6 q0 I
in the field of geometrical dimensioning and tolerancing in the German
+ {4 K2 w# I) ^& UStandardization Institute (DIN), and he was the former chairman of the pertinent$ `1 o& J- F6 q
European Committee for Standardization (CEN). He is a long-time delegate in the pertinent- b# j4 j3 O$ ?# [! H' s# \
committees of the International Standardization Organization (ISO).4 |) w2 n0 _, @9 @9 ]$ z
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Georg Henzold |
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发表于 2009-11-11 20:44:46
