1、BRITISH STANDARD BS ISO 128-50:2001 Technical drawings General principles of presentation Part 50: Basic conventions for representing areas on cuts and sections ICS 01.100.01 NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAWBS ISO 128-50:2001 This British Standard, having been p
2、repared under the 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 37721 0 National foreword This British Standard reproduces verbatim ISO 128-50:2001 and implem
3、ents it as the UK 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 It partially supersedes BS ISO 128:1982 which will be withdrawn on completion of the overall revision process for ISO 128:1982.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 fig
4、ures, about which 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,
5、in the figures. The technical content of the standard is, however, believed to be correct and it has therefore been decided to implement the standard, unmodified, with the warning that the figures should be considered as illustrations only and that the text be used as the source of definition. The U
6、K participation in its preparation 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. Cros
7、s-references The British Standards which implement international 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.
8、 A British Standard does 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; pr
9、esent to the responsible 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, a
10、n inside front cover, the ISO title page, pages ii and iii, a blank page, pages 1 to 6, an inside back cover and a back cover. The BSI copyright notice displayed in this document indicates when the document was last issued. Amendments issued since publication Amd. No. Date CommentsReference number I
11、SO 128-50:2001(E) INTERNATIONAL STANDARD ISO 128-50 First edition 2001-04-15 Technical drawings General principles of presentation Part 50: Basic conventions for representing areas on cuts and sections Dessins techniques Principes gnraux de reprsentation Partie 50: Conventions de base pour la reprse
12、ntation des surfaces sur des coupes et des sectionsISO 128-50:2001(E) ii ISO 128-50:2001(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 carri
13、ed 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, governmental and non-governmental, in liaison with ISO, also take part in the work. I
14、SO 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 ISO/IEC Directives, Part 3. Draft International Standards adopted by the technical commit
15、tees 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 of the elements of this part of ISO 128 may be the subject of patent rights. ISO shall
16、 not be held responsible for identifying any or all such patent rights. International Standard ISO 128-50 was prepared by Technical Committee ISO/TC 10, Technical product documentation, Subcommittee SC 1, Basic conventions. This first edition of ISO 128-50 is based on ISO 128:1982, subclauses 4.1 to
17、 4.3 of which it cancels and replaces. ISO 128 consists of the following parts, 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
18、 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 mechanical engineering drawings Part 40: Basic conventions for cuts and sections Part 44: Sect
19、ions on mechanical engineering drawings Part 50: Basic conventions for representing areas on cuts and sections The following part is under preparation: Part 1: Introduction and indexINTERNATIONAL STANDARD ISO 128-50:2001(E)1 Technical drawings General principles of presentation Part 50: Basic conven
20、tions for representing areas on cuts and sections 1 Scope This part of ISO 128 specifies general principles for representing areas on cuts and sections on technical drawings (mechanical, electrical, architectural, civil-engineering etc.) following the orthographic projection methods specified in ISO
21、 5456-2. Attention has also been given to the requirements of reproduction, including microcopying in accordance with ISO 6428. NOTE The basic rules for cuts and sections are given in ISO 128-40 1 . 2 Normative references The following normative documents contain provisions which, through reference
22、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 based on this part of ISO 128 are encouraged to investigate the possibility of applying the most recent
23、 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 valid International Standards. ISO 128-20, Technical drawings General principles of presentation Part
24、 20: Basic conventions for lines. ISO 128-24:1999, Technical drawings General principles of presentation Part 24: Lines on mechanical engineering drawings. ISO 5456-2, Technical drawings Projection methods Part 2: Orthographic representations. ISO 6428, Technical drawings Requirements for microcopyi
25、ng. 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 of this part of ISO
26、128, the terms and definitions given in ISO 10209-1 and ISO 10209-2 apply.ISO 128-50:2001(E) 2 4 General This part of ISO 128 specifies six methods for the representation of areas on cuts and sections. These consist of indication byh a tchi n g(seecl au se5 ), by shading or toning (see clause 6), by
27、 extra-wide continuous outlines (see clause 7), of thin sections (see clause 8), of thin adjacent sections (see clause 9), and of special materials (see clause 10). Allowance shall be made for the means of reproduction used, in accordance with ISO 6428. 5 Hatching Hatching shall be done with the nar
28、row continuous lines of type 01.1.5 specified in ISO 128-24:1999 and at a convenient angle (preferably 45 to the principal outlines or lines of symmetry of cuts or sections (see Figure 1). Figure 1 Hatching of areas of cuts or sections Examples Separate areas of a cut or section of the same componen
29、t shall be hatched in an identical manner. The hatching of adjacent components shall be carried out using the specified lines running in different directions or differently spaced (see Figure 2). Figure 2 Hatching of adjacent areasISO 128-50:2001(E)3 Spacing between the hatching lines should be chos
30、en in proportion to the size of the hatched areas, provided this is in accordance with the requirements for minimum spacing given in ISO 128-20. Where cuts or sections of the same part in parallel are shown side by side, the hatching shall be identical (see Figure 3), but may be offset along the div
31、iding line between the cuts or sections for greater clarity. Figure 3 Hatching of an area parallel cuts or sections In the case of a large area, the hatching may be limited to a zone that follows the contour of the area (see Figure 4). Figure 4 Hatched contour of large area Hatching shall be interru
32、pted for inscriptions inside an area (see Figure 5). Figure 5 Hatching interrupted by inscriptionISO 128-50:2001(E) 4 6 Shading or toning Shading may consist of a pattern of dots or an overall toning of area (see Figure 6). Figure 6 Shading using dots and toning Spacing between dots should be chosen
33、 in proportion to the size of a shaded area. In the case of a large area, the shading may be limited to a zone that follows the areas contour (Figure 4). Shading or toning shall be interrupted for inscriptions inside an area (Figure 5). 7 Extra-wide continuous outlines Areas of cuts and sections may
34、 be emphasized by the extra-wide continuous line specified in ISO 128-20 (see Figure 7). Figure 7 Extra-wide continuous outline for emphasis 8 Thin sections Thin sections may be shown entirely black (see Figure 8). This method shall represent true geometry. Figure 8 Thin sectionsISO 128-50:2001(E)5
35、9 Thin adjacent sections Solid sections may be shown entirely black. A space of not less than 0,7 mm shall be left between adjacent sections of this type. See Figure 9. This method does not represent true geometry. Figure 9 Thin adjacent sections 10 Specific materials Different types of special repr
36、esentation can be used to indicate specific materials. If a special representation is used, its signification shall be clearly defined on the drawing (e.g. by a legend, or by reference to appropriate standards).ISO 128-50:2001(E) 6 Bibliography 1 ISO 128-40, Technical drawings General principles of
37、presentation Part 40: Basic conventions for cuts and sections.BS ISO 128-50:2001 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 inte
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