1、BRITISH STANDARD BS ISO 128-40:2001 Technical drawings General principles of presentation Part 40: Basic conventions for cuts and sections ICS 01.100.01 NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAWBS ISO 128-40:2001 This British Standard, having been prepared under the dire
2、ction of the Consumer Products and Services Sector Committee, was published under the authority of the Standards Committee and comes into effect on 15 August 2001 BSI 08-2001 ISBN 0 580 37716 4 National foreword This British Standard reproduces verbatim ISO 128-40:2001 and implements it as the UK na
3、tional standard. It partially supersedes BS ISO 128:1982 which will be withdrawn on completion of the overall revision process for ISO 128:1982. The UK participation in its preparation was entrusted to Technical Committee TDW/4, Engineering drawing, Metrology, precision measurement and all related d
4、ocumentation, 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 which implement international or European publications referred to in this document may be found in the BSI Standar
5、ds Catalogue under the section entitled “International Standards Correspondence Index”, or by using the “Find” facility of the BSI Standards Electronic Catalogue. A British Standard does not purport to include all the necessary provisions of a contract. Users of British Standards are responsible for
6、 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 responsible international/European committee any enquiries on the interpretation, or proposals for change, and keep the UK in
7、terests 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, the ISO title page, pages ii and iii, a blank page, pages 1 to 6, an inside front cover and a back cover. The BSI co
8、pyright date displayed in this document indicates when the document was last issued. Amendments issued since publication Amd. No. Date CommentsINTERNATIONAL STANDARD ISO 128-40 First edition 2001-06-01 Reference number ISO 128-40:2001(E) Technical drawings General principles of presentation Part 40:
9、 Basic conventions for cuts and sections Dessins techniques Principes gnraux de reprsentation Partie 40: Conventions de base pour les coupes et les sectionsii ISO 128-40:2001(E) iii Foreword ISO (the International Organization for Standardization) is a worldwide federation of national standards bodi
10、es (ISO member bodies). The work of preparing International Standards is normally carried out through ISO technical committees. Each member body interested in a subject for which a technical committee has been established has the right to be represented on that committee. International organizations
11、, governmental and non-governmental, in liaison with ISO, also take part in the work. ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization. International Standards are drafted in accordance with the rules given in the IS
12、O/IEC Directives, Part 3. Draft International Standards adopted by the technical committees are circulated to the member bodies for voting. Publication as an International Standard requires approval by at least 75 % of the member bodies casting a vote. Attention is drawn to the possibility that some
13、 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. International Standard ISO 128-40 was prepared by Technical Committee ISO/TC 10, Technical product documentation, Subcommittee SC 1, Basic co
14、nventions. This first edition is based on ISO 128:1982, clause 2 of which it cancels and replaces. ISO 128 consists of the following parts, under the general title Technical drawings General principles of presentation: Part 1: Introduction and index Part 20: Basic conventions for lines Part 21: Prep
15、aration 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 on mechanical engineering drawings Part 25: Lines on shipbuilding drawings Part 30: Basic conventions for views Part 34: Views on me
16、chanical engineering drawings Part 40: Basic conventions for cuts and sections Part 44: Sections on mechanical engineering drawings Part 50: Basic conventions for representing areas on cuts and sections Annex A forms a normative part of this part of ISO 128.INTERNATIONAL STANDARD ISO 128-40:2001(E)
17、1 Technical drawings General principles of presentation Part 40: Basic conventions for cuts and sections 1 Scope This part of ISO 128 specifies the general principles for presenting cuts and sections applicable to all kinds of technical drawings (mechanical, electrical, architectural, civil engineer
18、ing, etc.) following the orthographic projection methods specified in ISO 5456-2. For areas on cuts and sections, representation is according to ISO 128-50. Attention has also been given in this part of ISO 128 to the requirements of reproduction, including microcopying in accordance with ISO 6428.
19、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 amendments to, or revisions of, any of these publications do not apply. However, parties to agreements ba
20、sed 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 edition of the normative document referred to applies. Members of ISO and IEC maintain registers of currently
21、valid International Standards. ISO 128-23:1999, Technical drawings General principles of presentation Part 23: Lines on construction drawings ISO 128-24:1999, Technical drawings General principles of presentation Part 24: Lines on mechanical engineering drawings. ISO 128-30, Technical drawings Gener
22、al principles of presentation Part 30: Basic conventions for views. ISO 128-50, Technical drawings General principles of presentation Part 50: Basic conventions for representing areas on cuts and sections. ISO 3098-0, Technical product documentation Lettering Part 0: General requirements. ISO 5456-2
23、, Technical drawings Projection methods Part 2: Orthographic representations. ISO 6428, Technical drawings Requirements 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 produc
24、t documentation Vocabulary Part 2: Terms relating to projection methods. ISO 81714-1, Design of graphical symbols for use in the technical documentation of products Part 1: Basic rules.ISO 128-40:2001(E) 2 3 Terms and definitions For the purposes of this part of ISO 128, the terms and definitions gi
25、ven in ISO 10209-1 and ISO 10209-2, and the following, apply. 3.1 cutting plane imaginary plane at which the object represented is cut through 3.2 cutting line line indicating the position of a cutting plane, or the sectioning axis in the case of two or more cutting planes 3.3 cut sectional view sec
26、tion showing, in addition, outlines beyond the cutting plane NOTE This is an extract from ISO 10209-1:1992 (term 2.2). However, the usage of the terms “cut” and “section” differs between the mechanical engineering and construction fields. While “cut” is generally used in the construction field, “sec
27、tion” is generally used in the mechanical engineering field, regardless of the definitions in 3.3 or 3.4. 3.4 section representation showing only the outlines of an object lying in one or more cutting planes NOTE This is an extract from ISO 10209-1:1992 (term 2.9). However, the usage of the terms “c
28、ut” and “section” differs between the mechanical engineering and constrution fields. While “cut” is generally used in the construction field, “section” is generally used in the mechanical engineering field, regardless of the definitions in 3.3 or 3.4. 3.5 half cut/half section representation of a sy
29、mmetrical object which, divided by the centre line, is drawn half in view and half in cut or section 3.6 local cut/local section representation in which only a part of an object is drawn in cut or section 4 General The general rules for the arrangement of views (see ISO 128-30) apply equally when dr
30、awing cuts and sections. Each cut and section shall be given clear identification with twice the same capital letter, once at each of the reference arrows (drawn with a continuous wide line of type 01.2.8 according to ISO 128-24:1999 or 01.2.8 according to ISO 128-23:1999) indicating the direction o
31、f viewing for the relevant cut and section, at the ends of the cutting line (see annex A). This identification should be positioned for reading from the bottom of the drawing. The or cut and section arrow is defined in annex A, as is the lettering height of the identification. The designated cut and
32、 section may be located irrespective of the view in which the cutting plane is taken. The identification of the referenced cuts and sections shall be placed immediately above the relevant representation. Representation of areas on cuts and sections is covered by ISO 128-50. The position of the cutti
33、ng plane(s) shall be indicated by means of a long-dashed dotted wide line (cutting line) of the type 04.2 according to ISO 128-24:1999 or 04.2.1 according to ISO 128-23:1999. A straight cutting plane shall be drawn to a suitable length for legibility (see Figure 1). 30 90 ISO 128-40:2001(E) 3 If the
34、 cutting plane changes its direction, the cutting line should only be drawn at the ends of the cutting plane, where the cutting plane changes direction (see Figure 2). The cutting line may be drawn to its full length (with a long-dashed dotted narrow line of the type 04.1 according to ISO 128-24:199
35、9 or 04.1 according to ISO 128-23:1999) if necessary for its legibility. Figure 1 Example from construction field Figure 2 Example from mechanical engineering fieldISO 128-40:2001(E) 4 5 Sections revolved in the relevant view If unambiguous, a section can be revolved in the relevant view. If this is
36、 done, the outline of the section shall be drawn with continuous narrow lines of the type 01.1.16 according to ISO 128-24:1999 or 01.1.11 according to ISO 128-23:1999; further identification is then not necessary see Figure 3 a) and b). NOTE The rotational direction of the section in the view is unk
37、nown. 6 Cuts/sections of symmetrical parts Symmetrical parts may be drawn half in view and half in cut/section (see Figure 4). 7 Local cuts/sections A local cut/section may be drawn if a complete or a half cut/section is unnecessary. The local break shall be shown by a continous narrow line with zig
38、zags or freehand of type 01.1.19 or 01.1.18 according to ISO 128-24:1999 or 01.1.14 according to ISO 128-23:1999. See Figure 5. a) Example 1 b) Example 2 Figure 3 Sections revolved in relevant view Figure 4 Half in section of symmetrical part Figure 5 Local cutISO 128-40:2001(E) 5 Annex A (normative
39、) Graphical symbols A.1 General In order to harmonize the sizes of the graphical symbols specified in this part of ISO 128 with those of the other inscriptions on the drawing (dimensions, tolerances, etc.), the rules given in ISO 81714-1 shall apply. The cut and section identification lettering heig
40、ht, , shall be larger than the normal lettering on the technical drawing by a factor of . Within Figures A.1 and A.2, lettering type B, vertical, according to ISO 3098-0, applies. Other lettering types are also permitted. A.2 Cut and section arrows See Figure A.1 for cut and section arrows, and Figu
41、re A.2 for cut and section arrows. Figure A.1 Figure A.2 h p 2 30 90 ISO 128-40:2001(E) 6 Bibliography 1 ISO 128-20, Technical drawings General principles of presentation Part 20: Basic conventions for lines.BS ISO 128-40:2001 BSI 389 Chiswick High Road London W4 4AL BSI British Standards Institutio
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