DIN EN 12890 pdf free download

DIN EN 12890-2000 pdf free download.Patterns, pattern equipment and core boxes for the production of sand moulds and sand cores.
6 Specifications6.1General
Drawings/numerical data, design and specifications shall be in accordance with the requirements of EN 1559-1, asapplicable.
The quality class of pattems,patterm equipment and coreboxes shall be stated on the order (see tables 2 to 6).
6.2Designation
The designation of the quality class on the drawings and other relevant documents shall contain the following:- the number of this European Standard(EN 12890);
– the quality class.
EXAMPLE:
EN 12890- H3
7 Manufacturing requirements7.1 Materials
Unless otherwise agreed, patterns, patterm equipment and coreboxes shall be made of one or more of the materialtypes shown in table 1.
7.2 Manufacture
Unless otherwise agreed,patterns, pattem equipment and coreboxes shall be manufactured in accordance with therequirements detailed in tables 2 to 6, as applicable. By agreement between the parties concerned, parts of thepatterns, pattern equipment and coreboxes can be manufactured of other materials and to other quality classes thanthose specified in table 1.
7.3 Contractions
Unless otherwise specified, the reference values for linear casting contractions given in annex B shall apply.
NOTE 1: The contractions and contraction ranges in certain castings can differ from the values given in annex B andcan vary across the three axes of the casting.Therefore it is recommended that there is consultation between themanufacturer (patternmaker) and the founder.
NOTE 2: The casting design can often lead to distortion or initiate defects on solidification. Therefore it is recom-mended that there is consultation between the parties concerned to make provision for these possibilities beforedeciding upon the construction and shape of the patterns, pattem equipment and coreboxes.
7.4 Tapers
Unless otherwise specified, the tapers given in table 7 shall be used.NOTE: Reference can also be made to ISO 8062 : 1994.
7.5 Clearances
Closing, covering and mould assembly clearances shall be agreed between the manufacturer (patternmaker) andthe founder.
NOTE: Further information on clearances is given in figures 1 to 3.7.6 Required machining allowances (RMA)
Any required machining allowance (RMA) to be added to the patterns, pattern equipment and coreboxes shall beagreed between the parties concerned (see clause 4).
NOTE: Guidance on the choice of required machining allowances (RMA) is given in ISO 8062 : 1994.7.7Dimensional tolerances
Dimensional tolerances shall be in accordance with the values given in tables 2 to 4 for each quality class of pattemnmaterial,unless otherwise agreed by the time of acceptance of the order.
7.8Surface coating
As applicable，the surfaces of pattems, pattem equipment and coreboxes shall be coated to provide for theirprotection and/or identification in accordance with the agreement made between the parties concerned (seeclause 4).
When a surface coating is specified, the materials used in the mouldinglcoremaking process and the surface coatingshall be compatible.
Unless otherwise agreed, the requirements detailed in table 8 shall apply.
NOTE:lt is nomal practice for the manufacturer (patternmaker) to protect the suriaces of the patterns, patternequipment and coreboxes and at the same time identify the various functional surfaces with a colour coding arrange-ment.
8 Quality control
As applicable, the manufacturer (patternmaker) shall maintain written evidence that he has caried out the followingquality control procedures before, during and after the manufacture of the equipment:
a) pre-production planning;b) contract review;
c) dimensionat inspection and completion of dimension sheets;d) identification;
e) jig/fixture inspection;
f) jig location point inspection.
NOTE: lt is recommended that the manufacturer (pattermmaker) operates a third party quality assurance systemsuch as that specified in either EN ISO 9001,EN iSo 9o02 orENi ISo 9o03 or any other system.DIN EN 12890 pdf download.