1、| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | BRITISH STANDARD BS EN 12892:2000 Incorpor
2、ating Corrigendum No. 1 The European Standard EN 12892:2000 has the status of a British Standard ICS 77.180 NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAW Founding Equipment for the production of lost patterns for the lost foam casting processThis British Standard, having bee
3、n prepared under the direction of the Engineering Sector Committee, was published under the authority of the Standards Committee and comes into effect on 15 June 2000 BSI 19 October 2001 ISBN 0 580 34199 2 BS EN 12892:2000 Amendments issued since publication Amd. No. Date Comments 13533 19 October 2
4、001 Spelling error corrected on front cover National foreword This British Standard is the official English language version of EN 12892:2000. The UK participation in its preparation was entrusted to Technical Committee ISE/NFE/9, Foundry technology, which has the responsibility to: aid enquirers to
5、 understand the text; present to the responsible 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. A list of organizations represented on this com
6、mittee 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 Standards Catalogue under the section entitled “International Standards Correspondence Index”, or by
7、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 their correct application. Compliance with a British Standard does not of itself confer immun
8、ity from legal obligations. Summary of pages This document comprises a front cover, an inside front cover, the EN title page, pages 2 to 16, an inside back cover and a back cover. The BSI copyright notice displayed in this document indicates when the document was last issued.EUROPEAN STANDARD NORME
9、EUROPENNE EUROPISCHE NORM EN 12892 February 2000 ICS 77.180 English version Founding - Equipment for the production of lost patterns for the lost foam casting process Fonderie - Outillages pour la production de modles perdus pour le procd de moulage “lost foam” Gieereiwesen Einrichtungen zur Herstel
10、lung von verlorenen Modellen fr das Vollformgieverfahren This European Standard was approved by CEN on 25 December 1999. 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 withou
11、t any alteration. Up-to-date lists and bibliographical references concerning such national standards may be obtained 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 mad
12、e by translation under the responsibility of a CEN member into its own language and notified to the Central Secretariat 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,
13、 Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and United Kingdom. EUROPEAN COMMITTEE FOR STANDARDIZATION COMIT EUROPEN DE NORMALISATION EUROPISCHES KOMITEE FR NORMUNG Central Secretariat: rue de Stassart, 36 B-1050 Brussels 2000 CEN All rights of exploitation
14、 in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN 12892:2000 EPage 2 EN 12892:2000 BSI 19 October 2001 Contents Page Foreword 3 Introduction 4 1 Scope . 5 2 Normative references 5 3 Terms and definitions . 5 4 Order information and delivery conditions 7 4.1 Gener
15、al . 7 4.2 Points to be discussed . 7 4.3 Mandatory information . 8 5 Classification 8 6 Specifications 9 6.1 Drawings and/or numerical data and/or master patterns 9 6.2 Designation . 6.3 Sub-contracted services 9 6.4 Mass 9 6.5 Tooling filling systems . 10 6.6 Tooling temperature . 10 7 Manufacturi
16、ng requirements . 10 7.1 Materials 10 Page 7.2 Manufacture 10 7.3 Contractions 12 7.4 Required machining allowances (RMA) . 12 7.5 Tolerances 13 7.6 Marking and labelling 13 8 Quality control 13 8.1 Inspection documentation 13 8.2 Samples 13 9U s a g e . 13 9.1 General . 13 9.2 Thermal stability 13
17、9.3 Pressure (clamping and injection) 14 9.4 Tooling handling . 14 9.5 Tooling location, connection and alignment 14 9.6 Pattern stripping and handling 14 9.7 Tooling assembly 14 9.8 Prevention of pattern distortion 14 9.9 Repair and refurbishment . 14 9.10 Packaging and protection . 14 9.11 Other r
18、equirements . 14 Annex A (informative) Examples at a dimensional test report and a tooling checklist 15Page 3 EN 12892:2000 BSI 19 October 2001 Foreword This European Standard has been prepared by Technical Committee CEN/TC 190, Foundry technology, the secretariat of which is held by DIN. This Europ
19、ean Standard shall be given the status of a national standard, either by publication of an identical text or by endorsement, at the latest by August 2000, and conflicting national standards shall be withdrawn at the latest by August 2000. According to the CEN/CENELEC Internal Regulations, the nation
20、al standards organizations of the following countries are bound to implement this European Standard: Austria, Belgium, Czech Republic, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and the United Kingdom. Wit
21、hin its programme of work, Technical Committee CEN/TC 190 requested CEN/TC 190/WG 1.30 “Production equipment, tools, foundry auxiliaries (e.g. patterns, permanent moulds, moulding materials)“ to prepare the following standard: EN 12892 Founding Equipment for the production of lost patterns for the l
22、ost foam casting process This is one of three of European Standards for foundry patterns and tools. The other standards are: prEN 12883 Founding Equipment for the production of lost patterns for the lost wax casting process EN 12890 Founding Patterns, pattern equipment and coreboxes for the producti
23、on of sand moulds and sand coresPage 4 EN 12892:2000 BSI 19 October 2001 Introduction Lost pattern production processes involve the moulding of a pattern. The pattern is then destroyed either prior to or during the casting process. At present two processes are commonly used: investment casting (lost
24、 wax process); lost foam process. This standard concerns the lost foam process. This standard describes the specification for tooling to produce patterns or cores for the lost foam process. This standard is intended for purchasers, manufacturers and founders. It is also intended to ensure correct in
25、terpretation of part and tool drawings/numerical data, and to ensure pattern equipment will produce lost moulds and lost cores, suitable for use and to assist in determining the usually undefined limits of good workmanship. It stresses the need for consultation between the founder, manufacturer (pat
26、terns), manufacturer (tooling) and purchaser before work commences. This standard is intended to assist interested parties in producing tooling for urea or dense polystyrene or expanded material patterns suitable for use to produce castings by the lost pattern process. There is a complex relationshi
27、p between the parties who might be involved in specifying, manufacturing, ordering and designing the equipment within the scope of this standard. NOTE: Figure 1 gives an indication of the relationships that could exist between the four parties concerned. Figure 1 Model inter-relationships between th
28、e contracting parties This standard not only specifies the usual features of design, manufacture, materials, tolerances, contractions and required machining allowances but also specifies other features such as usage, classification, quality control, marking, packaging and storage.Page 5 EN 12892:200
29、0 BSI 19 October 2001 1 Scope This standard specifies the requirements for tooling for the production of lost patterns by the lost foam process. 2 Normative references This European Standard incorporates by dated or undated reference, provisions from other publications. These normative references ar
30、e cited at the appropriate places in the text and the publications are listed hereafter. For dated references, subsequent amendments to or revisions of any of these publications apply to this European Standard only when incorporated in it by amendment or revision. For undated references the latest e
31、dition of the publication referred to applies. EN 10204 Metallic products Types of inspection documents EN 20286-1 ISO system of limits and fits Part 1: Bases of tolerances, deviations and fits (ISO 286-1:1988) ISO 8062:1994 Castings System of dimensional tolerances and machining allowances 3 Terms
32、and definitions For the purposes of this standard, the following terms and definitions apply: 3.1 collapsible insert Part made in two or more pieces to permit withdrawal from an undercut pattern surface. 3.2 contraction Provision applied to the tooling for shrinkage occurring during the production o
33、f castings. 3.3 dowel register Component which ensures accuracy of fit or alignment between mating portions of the tooling. 3.4 taper Draft angles on surfaces of tooling parts or lost patterns which enable the tooling parts or the lost patterns to be withdrawn. 3.5 fixing One or more components whic
34、h ensure that the parts of the tooling are held together securely and accurately. 3.6 insert or loose piece Part which is removed by hand or by mechanical means from the pattern before or during stripping and is then repositioned in the tooling.Page 6 EN 12892:2000 BSI 19 October 2001 3.7 lost foam
35、process Pattern casting process in which a destructible pattern material is used. NOTE: The pattern is surrounded by a heat resistant material prior to pouring. 3.8 manufacturer (patterns) Person or body responsible for the manufacture of lost foam patterns. 3.9 manufacturer (tooling) Person or body
36、 responsible for the manufacture of the tooling and/or ancillary equipment required to produce a lost foam pattern. 3.10 master pattern Model used to produce a pattern which includes the appropriate contractions. 3.11 mismatch Offset conditions at parting line caused by misalignment. 3.12 pattern Fo
37、am based shaped material. 3.13 pattern injection Process of filling the tooling cavity with expandable material. 3.14 stripping Action of removing the pattern from the tooling by hand or by mechanical means. 3.15 tooling All the equipment required for the production of a lost pattern (except the mac
38、hine used to inject the foam). 3.16 tooling cavity Intended space in the tooling into which pattern material is introduced. 3.17 tooling filling system Openings used to introduce the pattern material into the tooling.Page 7 EN 12892:2000 BSI 19 October 2001 4 Order information and delivery condition
39、s 4.1 General There shall have been an agreement made and an exchange of information carried out between the purchaser, the manufacturer (patterns), the manufacturer (tooling) and the founder by the time of acceptance of the order, to ensure a full understanding of the respective requirements of the
40、 parties concerned. 4.2 Points to be discussed As applicable, the following essential points shall be considered during the negotiation stage: casting material(s) and its (their) identification; number of patterns to be produced; number of sub-elements for each pattern; pattern and/or core materials
41、; drawings and/or numerical data; number of tooling cavities required; contractions; joint lines; pattern joints; tapers; components and identification of tooling; required machining allowances; machining provisions and tooling finishing requirements; tooling materials; tooling quality class; surfac
42、e condition of the tooling cavity; dimensional tolerances; pattern stripping and cooling support systems; tooling inspection requirements and inspection fixtures; runner/feeder positions and, if necessary, the system; tooling accessories; assembly accessories; any other important parameters such as
43、surface protection and packaging for transport, storage, venting and assembling arrangements.Page 8 EN 12892:2000 BSI 19 October 2001 4.3 Mandatory information The enquiry and order shall include information on: a) number of toolings to be supplied and the delivery requirements; b) specification(s)
44、of the material(s) to be used in the manufacture of the tooling; c) relevant drawings and/or numerical data; d) contraction(s) to be used; e) size and position of any gating required; f) positions and sizes of blow holes for expanded material; g) information on tooling mounting, connection and align
45、ment; h) surface condition required for the tooling cavity; i) inspection(s) and documentation required; j) relevant quality class; k) any functional tests required; and, as applicable: l) additional properties not specified in the material standards; m) special measures to be taken or specification
46、s to be observed, particularly with regard to the testing of welds; n) repairs of tooling; o) type of protection and packaging; NOTE: Transport arrangements can be included. p) approval procedures; q) storage arrangements; r) any other requirements. 5 Classification There shall be an agreement made
47、between the parties concerned on the quality class to be adopted. NOTE: Table 1 gives guidance for the selection of metal pattern equipment.Page 9 EN 12892:2000 BSI 19 October 2001 Table 1 Metal pattern equipment Features Quality class M5 M6 Use Long run manufacture using foam injection machines and
48、 involving high standards Batchwise manufacture using foam injection machines and involving high standards Manufacture Worked from solid material (machined) or cast to size and suitably finished As for M5, but finishing not as critical, alternatively made up from several parts Material Aluminium all
49、oys, steels and other alloys As for M5 Wearing parts See relevant material As for M5 Loose pieces See relevant material As for M5 Dimensional tolerances In accordance with EN 20286-1 and ISO 8062:1994 As for M5 6 Specifications 6.1 Drawings and/or numerical data and/or master patterns The purchaser shall make available to the manufacturer (tooling) any necessary drawings of the casting and/or numerical data and/or master patterns. The identification of the relevant drawings and/or releva
