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1、BRITISH STANDARD BS EN ISO 5456-2:1999 Technical drawings Projection methods Part 2: Orthographic representations The European Standard EN ISO 5456-2:1999 has the status of a British Standard ICS 01.100.01 ? Licensed Copy: sheffieldun sheffieldun, na, Wed Nov 15 05:08:35 GMT+00:00 2006, Uncontrolled
2、 Copy, (c) BSI BS EN ISO 5456-2:1999 This British Standard, having been prepared under the direction of the Engineering Sector Committee, was published under the authority of the Standards Committee and comes into effect on 15 October 1999 BSI 15 September 2002 ISBN 0 580 35160 2 National foreword T
3、his British Standard is the English language version of EN ISO 5456-2:1999. It is identical with ISO 5456-2:1996. The UK participation in its preparation was entrusted to Technical Committee TDE/4, Engineering drawing, metrology, precision measurement and all related documentation, which has the res
4、ponsibility to: A list of organizations represented on this committee can be obtained on request to its secretary. Cross-references Attention is drawn to the fact that CEN and CENELEC Standards normally include an annex which lists normative references to international publications with their corres
5、ponding European publications. The British Standards 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 S
6、tandards Electronic Catalogue. 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 enquir
7、ers to understand the text; present 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 docum
8、ent comprises a front cover, an inside front cover, the EN ISO title page, the EN ISO foreword page, the ISO title page, pages ii to iv, pages 1 to 10, an inside back cover and a back cover. The BSI copyright notice displayed in this document indicates when the document was last issued. Amendments i
9、ssued since publication Amd. No.DateComments Licensed Copy: sheffieldun sheffieldun, na, Wed Nov 15 05:08:35 GMT+00:00 2006, Uncontrolled Copy, (c) BSI EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN ISO 5456-2 July 1999 ICS 01.100.10 English version Technical drawings Projection methods Part 2
10、: Orthographic representations (ISO 5456-2:1996) Dessins techniques Mthodes des projection Partie 2: Reprsentations orthographiques (ISO 5456-2:1996) Technische Zeichnungen Projektionsmethoden Teil 2: Orthogonale Darstellungen (ISO 5456-2:1996) This European Standard was approved by CEN on 27 May 19
11、99. CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such national standards may be obtained
12、on application to the Central Secretariat or to any CEN member. This European Standard exists in three official versions (English, French, German). A version in any other language made by translation under the responsibility of a CEN member into its own language and notified to the Central Secretari
13、at has the same status as the official versions. CEN members are the national standards bodies of Austria, Belgium, Czech Republic, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and United Kingdom. CEN Europe
14、an Committee for Standardization Comit Europen de Normalisation Europisches Komitee fr Normung Central Secretariat: rue de Stassart 36, B-1050 Brussels 1999 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN ISO 5456-2:1999 E Licensed
15、 Copy: sheffieldun sheffieldun, na, Wed Nov 15 05:08:35 GMT+00:00 2006, Uncontrolled Copy, (c) BSI EN ISO 5456-2:1999 BSI 15 September 2002 Foreword The text of the International Standard from Technical Committee ISO/TC 10, Technical drawings, product definition and related documentation, of the Int
16、ernational Organization for Standardization (ISO) has been taken over as a European Standard CEN/CS. This European Standard shall be given the status of a national standard, either by publication of an identical text or by endorsement, at the latest by January 2000, and conflicting national standard
17、s shall be withdrawn at the latest by January 2000. According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following countries are bound to implement this European Standard: Austria, Belgium, Czech Republic, Denmark, Finland, France, Germany, Greece, Iceland,
18、Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and the United Kingdom. Endorsement notice The text of the International Standard ISO 5456-2:1996 has been approved by CEN as a European Standard without any modification. NOTE Normative references to International
19、 Standards are listed in Annex ZA (normative). Licensed Copy: sheffieldun sheffieldun, na, Wed Nov 15 05:08:35 GMT+00:00 2006, Uncontrolled Copy, (c) BSI Licensed Copy: sheffieldun sheffieldun, na, Wed Nov 15 05:08:35 GMT+00:00 2006, Uncontrolled Copy, (c) BSI EN ISO 5456-2:1999 ii BSI 15 September
20、2002 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 subject for whic
21、h 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 (IEC) on all ma
22、tters of electrotechnical standardization. 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. International Standard ISO 545
23、6-2 was prepared by Technical Committee ISO/TC 10, Technical drawings, product definition and related documentation, Subcommittee SC 1, Basic conventions. ISO 5456 consists of the following parts, under the general title Technical drawings Projection methods: Part 1: Synopsis Part 2: Orthographic re
24、presentations Part 3: Axonometric representations Part 4: Central projection Annex A forms an integral part of this part of ISO 5456. Descriptors: graphic methods, drawings, technical drawings, graphic projections. Licensed Copy: sheffieldun sheffieldun, na, Wed Nov 15 05:08:35 GMT+00:00 2006, Uncon
25、trolled Copy, (c) BSI EN ISO 5456-2:1999 BSI 15 September 2002 iii Introduction Orthographic representation in its various forms is the most widely used method of representing technical objects in all fields of technical drawing (mechanical, electrical, construction, etc.), and is thus considered to
26、 be the accepted technical language. Licensed Copy: sheffieldun sheffieldun, na, Wed Nov 15 05:08:35 GMT+00:00 2006, Uncontrolled Copy, (c) BSI iv blank Licensed Copy: sheffieldun sheffieldun, na, Wed Nov 15 05:08:35 GMT+00:00 2006, Uncontrolled Copy, (c) BSI EN ISO 5456-2:1999 BSI 15 September 2002
27、 1 1 Scope This part of ISO 5456 specifies basic rules for the application of orthographic representation to all types of technical drawings in all technical fields, according to the general rules specified in ISO 128, ISO 129, ISO 3098-1, ISO 3461-2 and ISO 5456-1. 2 Normative references The follow
28、ing standards contain provisions which, through reference in this text, constitute provisions of this part of ISO 5456. At the time of publication, the editions indicated were valid. All standards are subject to revision, and parties to agreements based on this part of ISO 5456 are encouraged to inv
29、estigate the possibility of applying the most recent editions of the standards indicated below. Members of IEC and ISO maintain registers of currently valid International Standards. ISO 128:1982, Technical drawings General principles of presentation. ISO 129:1985, Technical drawings Dimensioning Gen
30、eral principles, definitions, methods of execution and special indications. ISO 3098-1:1974, Technical drawings Lettering Part 1: Currently used characters. ISO 3461-2:1987, General principles for the creation of graphical symbols Part 2: Graphical symbols for use in technical product documentation.
31、 ISO 5456-1:1996, Technical drawings Projection methods Part 1: Synopsis. ISO 10209-1:1992, Technical product documentation Vocabulary Part 1: Terms relating to technical drawings: general and types of drawings. ISO 10209-2:1993, Technical product documentation Vocabulary Part 2: Terms relating to p
32、rojection methods. 3 Definitions For the purposes of this part of ISO 5456, the definitions given in ISO 5456-1, ISO 10209-1 and ISO 10209-2 apply. Licensed Copy: sheffieldun sheffieldun, na, Wed Nov 15 05:08:35 GMT+00:00 2006, Uncontrolled Copy, (c) BSI EN ISO 5456-2:1999 2 BSI 15 September 2002 4
33、General principles 4.1 General Orthographic representation is obtained by means of parallel orthogonal projections and results in flat, two-dimensional views systematically positioned relative to each other. To show an object completely, the six views in the directions a, b, c, d, e and f may be nec
34、essary, in order of priority (see Figure 1 and Table 1). 4.2 Designation of views See Table 1. Table 1 The most informative view of the object to be represented is normally chosen as the principal view (front view). This is view A according to the direction of viewing a (see Figure 1 and Table 1), g
35、enerally showing the object in the functioning or manufacturing or mounting position. The position of other views relative to the principal view in the drawing depends on the projection method chosen (first angle, third angle, reference arrows). In practice, not all six views (A to F) are needed. Wh
36、en views (cuts or sections) other than the principal view are necessary, these shall be selected in order to: limit the number of views, cuts and sections to the minimum necessary and sufficient to fully represent the object without ambiguity; avoid unnecessary repetition of detail. Figure 1 Directi
37、on of observationDesignation of view View in directionView from athe frontA baboveB (E)1) cthe leftC dthe rightD ebelowE fthe rearF 1) See 5.4. Licensed Copy: sheffieldun sheffieldun, na, Wed Nov 15 05:08:35 GMT+00:00 2006, Uncontrolled Copy, (c) BSI EN ISO 5456-2:1999 BSI 15 September 2002 3 5 Meth
38、ods of representation 5.1 First angle projection The first angle projection method is an orthographic representation in which the object to be represented (see Figure 1) appears between the observer and the coordinate planes on which the object is orthogonally projected (seeFigure 2). The positions
39、of the various views relative to the principal (front) view A are determined by rotating their projection planes around lines coinciding with or parallel to the coordinate axes on the coordinate plane (drawing surface) on which the front view A is projected (see Figure 2). Therefore, in the drawing,
40、 with reference to the principal view A, the other views are arranged as follows (see Figure 3): View B: the view from above is placed underneath; View E: the view from below is placed above; View C: the view from left is placed on the right; View D: the view from the right is placed on the left; Vi
41、ew F: the view from the rear is placed on the right or on the left, as convenient. The identifying graphical symbol of this method is shown in Figure 4. Figure 2 Licensed Copy: sheffieldun sheffieldun, na, Wed Nov 15 05:08:35 GMT+00:00 2006, Uncontrolled Copy, (c) BSI EN ISO 5456-2:1999 4 BSI 15 Sep
42、tember 2002 5.2 Third angle projection The third angle projection method is an orthographic representation in which the object to be represented (see Figure 1), as seen by the observer, appears behind the coordinate planes on which the object is orthogonally projected (see Figure 5). On each project
43、ion plane, the object is represented as if seen orthogonally from infinite distance with transparent projection planes. The positions of the various views relative to the principal (front) view A are determined by rotating their projection planes around lines coinciding with or parallel to the coord
44、inate axes on the coordinate plane (drawing surface) on which the front view A is projected (see Figure 5). Therefore, in the drawing, with reference to the principal view A, the other views are arranged as follows (seeFigure 6): View B: the view from above is placed above; View E: the view from bel
45、ow is placed underneath; View C: the view from the left is placed on the left; View D: the view from the right is placed on the right; View F: the view from the rear may be placed on the left or on the right, as convenient. The identifying graphical symbol of this method is shown in Figure 7. Figure
46、 3 Figure 4 Licensed Copy: sheffieldun sheffieldun, na, Wed Nov 15 05:08:35 GMT+00:00 2006, Uncontrolled Copy, (c) BSI EN ISO 5456-2:1999 BSI 15 September 2002 5 Figure 5 Figure 6 Licensed Copy: sheffieldun sheffieldun, na, Wed Nov 15 05:08:35 GMT+00:00 2006, Uncontrolled Copy, (c) BSI EN ISO 5456-2
47、:1999 6 BSI 15 September 2002 5.3 Reference arrows layout In those cases where it is advantageous to position the views not according to the strict pattern of the first or the third angle projection method, the use of the reference arrows method permits the various views to be freely positioned. Wit
48、h the exception of the principal view, each view shall be identified by a letter in accordance with Figure 1. A lower-case letter indicates in the principal view the direction of observation of the other views, which are identified by the corresponding capital letter placed immediately above the vie
49、w and on the left. The identified views may be located irrespective of the principal view (see Figure 8). Whatever the direction of observation, the capital letters (see ISO 3098-1) identifying the views shall always be positioned to be read from the normal direction of viewing of the drawing. No graphical symbol for the indication of this method is needed on the drawing. 5.4 Mirrored orthographic re