1、STD.BSI BS EN 12890-ENGL 2000 E 1b24bb9 0855030 018 m BRITISH STANDARD BS EN 12890:2000 Founding - Patterns, pattern equipment and coreboxes for the production of sand moulds and sand cores The European Standard EN 12890:2 has the status of a British Standard ICs 77.020 NO COPYING WITHOUT BSI PERMIS
2、SION EXCEPT AS PERMITTED BY COPYRIGHT LAW STD.BSI BS EN L2BSO-ENGL 2000 = 1624667 0855033 T54 0 BS EN 128902000 AmdNo. Date 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
3、 effect on 15 June 2000 Comments Q BSI 06-2000 ISBN O 580 34200 X National foreword This British Stan- is the official English ianguage version of EN 128902000. The UK participation in its preparation was entrusted to Technical Committee IS-, Foundry technology, which has the responsibility to: - ai
4、d enquirem to understand the te* - present to the responsible European committee any enquiries on the inteqn-etation, or proposals for change, and keep the UK interests informed; - monitor related international and European developments and promulgate them in the UK. A iist of organizations represen
5、ted 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 Standards Catalogue under the section entitied “intedonai Standards Correspondence Ind
6、ex“, or by using the “Find“ facility of the BSI Standards Electronic Catalogue. A British Standard does not purport to include ail the necessary provisions of a contract. Usem of British standards are responsible for their correct application. Compliance with a British Standard does not of itself co
7、nfer immunity from legal obligations. Summary of pages This document comprises a front cover, an inside front cover, the EN titie page, pages 2 to 29 and a back cover. The BSI copyright notice displayed in this document inclicah when the document waslastissued. STD.BS1 BS EN 12830-ENGL 2000 I Lb24bb
8、 0855032 990 I EUROPEAN STANDARD EN 12890 NORME EUROPENNE EUROPISCHE NORM February 2000 ICs 77.180 English version Founding - Patterns, pattern equipment and coreboxes for the production of sand moulds and sand cores Fonderie - Modles, outillages et boites noyaux pour la production des moules et noy
9、aux au sable Gieereiwesen - Modelle, Modelleinnchtungen und Kernksten zur Herstellung von Sandformen und Sandkernen This European Standard was approved by CEN on 25 December 1999 CEN members are bound to comply with the CENICENELEC Internal Regulations which stipulate the conditions for giving this
10、Europmn Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning sich national standards may be obtained on application to the Central Secretariat or to any CEN member. This European Standard exists in three official versions (Engl
11、ish, French, German). A version in any other language made by trawlation under the responsibility of a CEN member into its own language and notified to the Central Secretariat has the same status as he official versions. CEN members are the national standards bodies of Austria, Belgium, Czech Republ
12、ic, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and United Kingdom. EUROPEAN COMMIITEE FOR STANDARDIZATION EUROPISCHES KOMITEE FR NORMUNG COMIT EUROPEN DE NORMALISATION Central Secretariat: rue de Stassart,
13、 36 B-1050 Brussels Q 2000 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN 12890:2000 E STDIBSI BS EN L2890-ENGL 2000 = 1624bb9 0855033 627 Page 2 EN 12890:2000 Contents Page Foreword . 3 Introduction 4 1 2 3 4 4.1 4.2 4.3 5 6 6.1
14、6.2 7 7.1 7.2 7.3 7.4 7.5 7.6 7.7 7.8 8 9 9.1 9.2 9.3 9.4 9.5 Scope 4 Normative references . 4 Terms and definitions 4 Order information and delivery conditions 6 General 6 Points to be agreed . 6 Mandatory information 7 Classification . 7 Specifications 7 General 7 Designation . 8 Manufacturing req
15、uirements . Materials Manufacture Contractions Tapers . Clearances Required machining allowances (RMA) . Dimensional tolerances Surface coating . Quality control . 9 Usage 9 General 9 Identification 9 Modifications . 10 Repair and refurbishment . 1 O Protection and packaging for transportation and s
16、torage 10 Page Table 2: Quality classes - patterns, pattern equipment and coreboxes made of wood . 11 Table 3: Quality classes - patterns, pattern equipment and coreboxes made of metal . 15 Table 4: Quality classes - patterns, pattern equipment and coreboxes made of plastic 16 Table 5: Characteristi
17、cs of patterns and pattern equipment 18 Table 6: Characteristics of coreboxes 20 Table 7: Tapers 22 Table 8: Surface coatings (painting and colour- coding) of patterns, pattern equipment and coreboxes . 23 Figure I : Examples of clearances of core prints (vertical core) 24 Figure 2: Example of clear
18、ances of core prints (horizontal core) 25 Figure 3: Values for clearances of core prints (for moulding with horizontal joint Annex A (informative) Guidelines on the use ofthe tables in this standard 27 Annex B (informative) Reference values for surface) . 26 linear casting contractions . 28 Bibliogr
19、aphy 29 Table 1 : Quality classes for patterns, pattern equipment and coreboxes . 11 8 BSI 06-2000 STD.BSI BS EN 12870-ENGL 2000 m Lb24667 0855034 b3 0 Page 3 EN 12890:2000 Foreword This European Standard has been prepared by Technical Committee CENTTC 190, Foundry technology, the secretariat of whi
20、ch is held by DIN. 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 August 2000, and conflicting national standards shall be withdrawn at the latest by August 2000. According to the CENICENELEC Int
21、ernal 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, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerlan
22、d and the United Kingdom. Within its programme of work, Technical Committee CENTTC 190 requested CENTTC 190MIG 1.30 “Production equipment, tools, foundry auxiliaries (e.g. patterns, permanent moulds, moulding materials)” to prepare the following standard: EN 12890 Founding - Patterns, pattern equipm
23、ent and coreboxes for the production of sand moulds and sand cores 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 12892 Founding - Equipment fo
24、r the production of lost patterns for the lost foam casting process O BSI 06-2000 STD.BS1 BS EN L2890-ENGL 2000 ,= 1624669 0855035 bTT M Page 4 EN 12890:2000 Introduction This standard is intended for purchasers, manufacturers (pattemmakers) and founders. It is also intended to ensure the correct in
25、terpretation of casting and tooling drawingdnumerical data and to ensure that pattern equipment will produce sand moulds and/or sand cores, suitable for use, and to assist in detennining the usually undefined limits of good workmanship. This standard stresses the need for consultation between the pu
26、rchaser, manufacturer (patternmaker) and founder before work commences. The manufacture of a casting by a sand mould and/or a sand core manufacturing process requires the construction of pattern equipment. The CEN members had a variety of national standards and specifications relating to pattern equ
27、ipment. This standard brings together all the important features of these former documents. This standard enables the parties concerned to deal more easily with the complex problems associated with the design and manufacture of pattern equipment. This standard not only specifies the usual features o
28、f design, construction, materials, tolerances, contractions and required machining allowances but also specifies other features such as usage, classification, quality control, marking, packaging and storage. 1 Scope This standard specifies the requirements for patterns, pattern equipment and corebox
29、es for the production of sand moulds and/or sand cores. This standard does not specify equipment for the production of lost patterns, pennanent moulds and die casting dies. This standard does not specify the requirements for ancillary items used in the manufacture of pattern equipment (such as screw
30、s, dowels, etc.). 2 Normative references This European Standard incorporates by dated or undated reference, provisions from other publications. These nonnative references are cited at the appropriate places in the text and the publications are listed hereafter. For dated references, subsequent amend
31、ments 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 edition of the publication referred to applies. EN 1559-1 Founding - Technical conditions of delivery - Patt I: General IS0 syst
32、em of limits and fits - Part I: Bases of tolerances, deviations and Ms(IS0 286-1 :1988) EN 20286-1 IS0 1302 Technical drawings - Method of indicating surface texture NOTE: Informative references to documents used in the preparation of this standard, and cited at the appropriate places in the text, a
33、re listed in a bibliography. 3 Terms and definitions For the purposes of this standard, the following terms and definitions apply: 3.1 purchaser Person or body responsible for the ordering of the patterns, pattern equipment and coreboxes. 3.2 manufacturer (patternmaker) Person or body responsible fo
34、r the production of the patterns, pattern equipment and coreboxes. O BSI 06-2000 STD.BSI BS EN 12890-ENGL 2000 0 L624669 0855036 536 W Page 5 EN 12890:2000 3.3 founder Person or body responsible for the manufacture of castings from the moulds made from patterns, pattern equipment and coreboxes suppl
35、ied to it by the manufacturer (pattemmaker) or the purchaser. 3.4 sand mould Part or assembly of parts, made of heat resistant sand (such as silica sand, zircon sand, etc.), which usually forms the external surfaces of a casting and is not re-usable after pouring. 3.5 sand core Part or assembly of p
36、arts, made of heat resistant sand (such as silica sand, zircon sand, etc.), which usually forms the inner surfaces of a casting and is not reusable after pouring. 3.6 pattern Model which forms part or all of a subsequent mould or core assembly. 3.7 corebox Model which forms all of a core or part or
37、all of a subsequent core assembly. 3.8 pattern equipment All the components which make up all the necessary pieces to ensure the correct manufacture of a mould. 3.9 quality class Classification system which enables the parties concerned with the manufacture and use of patterns, pattern equipment and
38、 coreboxes to be aware of their properties (such as fitness for purpose, quality and life time). 3.10 contract review Analysis and/or check of the order details carried out by the parties concerned, both before and during the processing of the order. 3.11 core print Projection either attached to a p
39、attern to form recesses in the mould or attached to a core at points where cores are to be supported. 3.12 required machining allowance (RMA) Additional material deliberately added to certain surfaces of patterns, pattern equipment and coreboxes which is removed, partially or wholly, from the castin
40、g during subsequent machining. 3.13 contraction Dimensional factor deliberately built into patterns, pattern equipment and coreboxes during manufacture to take account of the change) in dimension(s) that may take place when the casting is made. 3.14 taper Slope or angle deliberately given to certain
41、 pattern or corebox surfaces to aid the stripping of the pattern from the mould or the core from the corebox. NOTE: Taper is sometimes referred to as draft or draft angle. 3.1 5 clearance Space deliberately built into certain pattern or corebox surfaces to aid the assembly of the mould andlor core.
42、O BSI 06-2000 STDmBSI BS EN L2890-ENGL 2000 M LbS4bbS 0855037 Y72 Page 6 EN 12890:2000 4 Order information and delivery conditions 4.1 General This clause details the technical order information and delivery condition requirements to be agreed between the purchaser and the manufacturer (patternmaker
43、). The patterns, pattern equipment and coreboxes can be ordered either by the purchaser or by the founder. If the purchaser is not the founder, it shall be a requirement that there is consultation between the purchaser and the founder. As applicable, there shall have been an agreement made and an ex
44、change of information carried out between the purchaser, the manufacturer (patternmaker) and the founder by the time of the acceptance of the order, to ensure a full understanding of the respective requirements of the parties concerned. NOTE: The production of castings requires the use of patterns a
45、ndlor coreboxes. The starting point in their manufacture is the drawinglnumerical data of the as-cast casting andlor the machined part as agreed with the purchaser who can: -either order the castings and pattern equipment together from the founder who can subcontract the pattern equipment manufactur
46、e to a pattenmaker; - or order the castings from the founder and the patterns, pattern equipment and coreboxes from the manufacturer (patternmaker) separately. 4.2 Points to be agreed The following points, as applicable, shall have been agreed by the time of the acceptance of the order: - cast mater
47、ial(s) and its (their) identification; - moulding and/or coremaking techniques; - dimensional tolerances; - mould and core joint lines; - pattern equipment identification; - pattern surface coating; - contractions; - clearances; -tapers; - required machining allowances; - pattern material(s); - patt
48、ern material quality class(es); - extent and type of quality inspection; - protection and packaging for transportation and storage. O BSI 06-2000 STD-BSI BS EN 12890-ENGL 2000 lb24bb9 0855038 309 m Page 7 EN 12890:2000 4.3 Mandatory information The enquiry and order shall include infomation on: a) d
49、esignation of material to be cast (symbol andlor number); b) number of castings to be produced; c) number of sets of pattern equipment to be supplied; d) delivery time; e) relevant drawing( or numerical data; f) quality class(es) required; g) inspection(s) and documentation required; and, as applicable: h) specification of the pattern andlor corebox materials to be used; i) moulding joint(s); j) sizes and positions of gates and risers required; k) contractions to be used; i) type of protection and packaging; NOTE: Transport arrangements can be included. m) repair and r
