1、BRITISH STANDARD BS ISO 128-44:2001 Technical drawings General principles of presentation Part 44: Sections on mechanical engineering drawings ICS 01.100.01 NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAWBS ISO 128-44:2001 This British Standard, having been prepared under the
2、direction of the Consumer Products and Services Sector committee, was published under the authority of the Standards Committee and comes into effect on 15 July 2001 BSI 07-2001 ISBN 0 580 37720 2 National foreword This British Standard reproduces verbatim ISO 128-44:2001 and implements it as the UK
3、national standard. It partially supersedes BS ISO 128:1982 which will be withdrawn on completion of the overall revision process for ISO 128:1982. The International Standard, implemented by this British Standard, contains some presentational defects particularly relating to the figures, about which
4、the UK has previously expressed some concerns but not withstanding this, the standard progressed to publication without correction of those defects. It is stressed that these are purely presentational and relate to such things as lettering heights and configuration of arrow heads, in the figures. Th
5、e technical content of the standard is, however, believed to be correct and it has therefore been decided to implement the standard, unmodified, with the figures should be considered as illustrations only and that the text be used as the source of definition. The UK participation in its preparation
6、was entrusted to Technical Committee TDW/4, Engineering drawing, Metrology, precision measurement and all related documentation, which has the responsibility to: A list of organizations represented on this committee can be obtained on request to its secretary. Cross-references The British Standards
7、which implement international or European publications referred to in this document may be found in the BSI Standards Catalogue under the section entitled “International Standards Correspondence Index”, or by using the “Find” facility of the BSI Standards Electronic Catalogue. A British Standard doe
8、s not purport to include all the necessary provisions of a contract. Users of British Standards are responsible for their correct application. Compliance with a British Standard does not of itself confer immunity from legal obligations. aid enquirers to understand the text; present to the responsibl
9、e international/European committee any enquiries on the interpretation, or proposals for change, and keep the UK interests informed; monitor related international and European developments and promulgate them in the UK. Summary of pages This document comprises a front cover, an inside front cover, t
10、he ISO title page, pages ii and iii, a blank page, pages 1 to 8, an inside back cover and a back cover. The BSI copyright date displayed in this document indicates when the document was last issued. Amendments issued since publication Amd. No. Date CommentsReference number ISO 128-44:2001(E) INTERNA
11、TIONAL STANDARD ISO 128-44 First edition 2001-04-15 Technical drawings General principles of presentation Part 44: Sections on mechanical engineering drawings Dessins techniques Principes gnraux de reprsentation Partie 44: Coupes et sections applicables aux dessins industrielsISO 128-44:2001(E) ii I
12、SO 128-44:2001(E)iii Foreword ISO (the International Organization for Standardization) is a worldwide federation of national standards bodies (ISO member bodies). The work of preparing International Standards is normally carried out through ISO technical committees. Each member body interested in a
13、subject for which a technical committee has been established has the right to be represented on that committee. International organizations, governmental and non-governmental, in liaison with ISO, also take part in the work. ISO collaborates closely with the International Electrotechnical Commission
14、 (IEC) on all matters of electrotechnical standardization. International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 3. Draft International Standards adopted by the technical committees are circulated to the member bodies for voting. Publication as an Int
15、ernational Standard requires approval by at least 75 % of the member bodies casting a vote. Attention is drawn to the possibility that some of the elements of this part of ISO 128 may be the subject of patent rights. ISO shall not be held responsible for identifying any or all such patent rights. In
16、ternational Standard ISO 128-44 was prepared by Technical Committee ISO/TC 10, Technical product documentation, Subcommittee SC 1, Basic conventions. This first edition of ISO 128-44 is based on ISO 128:1982, subclause 4.4 to 4.9 of which it cancels and replaces. ISO 128 consists of the following pa
17、rts, under the general title Technical drawings General principles of presentation: Part 20: Basic convention for lines Part 21: Preparation of lines by CAD systems Part 22: Basic conventions and applications for leader lines and reference lines Part 23: Lines on construction drawings Part 24: Lines
18、 on mechanical engineering drawings Part 25: Lines on shipbuilding drawings Part 30: Basic conventions for views Part 34: Views on mechanical engineering drawings Part 40: Basic conventions for cuts and sections Part 44: Sections on mechanical engineering drawings Part 50: Basic conventions for repr
19、esenting areas on cuts and sections The following part is under preparation: Part 1: Introduction and indexINTERNATIONAL STANDARD ISO 128-44:2001(E)1 Technical drawings General principles of presentation Part 44: Sections on mechanical engineering drawings 1 Scope This part of ISO 128 specifies gene
20、ral principles for presenting sections on mechanical engineering drawings following the orthographic projection methods specified in ISO 5456-2. For areas on sections, representation is according to ISO 128-50 1 . Attention has also been given to the requirements of reproduction, including microcopy
21、ing in accordance with ISO 6428. NOTE The basic rules for cuts and sections are given in ISO 128-40 2 . 2 Normative references The following normative documents contain provisions which, through reference in this text, constitute provisions of this part of ISO 128. For dated references, subsequent a
22、mendments to, or revisions of, any of these publications do not apply. However, parties to agreements based on this part of ISO 128 are encouraged to investigate the possibility of applying the most recent editions of the normative documents indicated below. For undated references, the latest editio
23、n of the normative document referred to applies. Members of ISO and IEC maintain registers of currently valid International Standards. ISO 128-20, Technical drawings General principles of presentation Part 20: Basic conventions for lines. ISO 128-24:1999, Technical drawings General principles of pre
24、sentation Part 24: Lines on mechanical engineering drawings. ISO 128-40, Technical drawings General principles of presentation Part 40: Basic conventions for cuts and sections. ISO 5456-2, Technical drawings Projection methods Part 2: Orthographic representations. ISO 6428, Technical drawings Requir
25、ements for microcopying. ISO 10209-1, Technical product documentation Vocabulary Part 1: Terms relating to technical drawings: general and types of drawings. ISO 10209-2, Technical product documentation Vocabulary Part 2: Terms relating to projection methods. 3 Terms and definitions For the purposes
26、 of this part of ISO 128, the terms and definitions given in ISO 10209-1 and ISO 10209-2 apply.ISO 128-44:2001(E) 2 4 General In principle, ribs, fasteners, shafts, spokes of wheels and the like are not cut in longitudinal sections, and should therefore not be represented as sections. Like views, se
27、ctions may be shown in a position other than that indicated by the arrows for the direction of their viewing. 5 Cutting planes A section in one plane is shown in Figure 1 and Figure 2. Figure 1 Section in one planeISO 128-44:2001(E)3 Figure 2 Section in one plane A section in two parallel planes is
28、shown in Figure 3. Figure 3 Section in two parallel planesISO 128-44:2001(E) 4 A section in three contiguous planes is shown in Figure 4. Figure 4 Section in three contiguous planes A section in two intersecting planes, one revolved into the plane of projection, is shown in Figure 5. Figure 5 Sectio
29、n in two intersecting planesISO 128-44:2001(E)5 In the case of parts of a revolution containing regularly spaced details required to be shown in sections but not situated in the cutting plane, these details may be depicted rotated into the cutting plane, provided that no ambiguity can arise (see Fig
30、ure 6). No additional identification is needed. Figure 6 Section of part of revolution with regularly spaced details not in, but rotated into, the cutting plane When it is sometimes necessary to position the cutting plane partly outside the object, it is not, however, necessary to show the long-dash
31、ed dotted narrow line of type 04.1 specified in ISO 128-24:1999 (see Figure 7). Figure 7 Cutting plane positioned partly outside objectISO 128-44:2001(E) 6 6 Removed sections When sections are removed from a view, they shall be placed near that view and connected to it by the long- dashed dotted nar
32、row line of type 04.1 specified in ISO 128-24:1999 (see Figure 8). Figure 8 Section removed from a view 7 Other sections For sections revolved in the relevant view, as well as for sections of symmetrical parts and local sections: according to ISO 128-40. 8 Arrangement of successive sections Successi
33、ve sections may be arranged in a manner similar to the examples shown in Figures 9 to 11, in as much as it is suitable for the layout and understanding of the drawing. Unless they contribute to the clarification of the drawing, outlines and edges behind the cutting plane may be omitted. Figure 9 Suc
34、cessive sections Example 1ISO 128-44:2001(E)7 Figure 10 Successive sections Example 2 Figure 11 Successive sections Example 3ISO 128-44:2001(E) 8 Bibliography 1 ISO 128-50, Technical drawings General principles of presentation Part 50: Basic conventions for representing areas on cuts and sections.BS
35、 ISO 128-44:2001 BSI 389 Chiswick High Road London W4 4AL BSI British Standards Institution BSI is the independent national body responsible for preparing British Standards. It presents the UK view on standards in Europe and at the international level. It is incorporated by Royal Charter. Revisions
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