专业标准
DEUTSCHE NORMAugust 1998
Rough castings of light metal alloys produced
by sand casting
General tolerances and machining allowances
(For replacement purposes only)
ICS77.150.10; 77.150.20
Descriptors:General tolerances, machining allowances, castings,
light metal alloys.Gußrohteile aus Leichtmetallegierungen – Sandguß –Allgemeintoleranzen, Bearbeitungszugaben (Nicht fürNeukonstruktionen)
{
1688-1
Supersedes
October 1980 edition.
In keeping with current practice in standards published by the International Organization for Standardization(ISO), a comma has been used throughout as the decimal marker.
Dimensions in mm
1Scope and field of application
This standard specifies general tolerances and machining allowances for rough castings of aluminium andmagnesium alloys produced by sand casting, which are subject to the technical delivery conditions laiddown in DIN 1725-2 and DIN 1729-2.
Users of this standard should note that it now only applies to castings used for repair and replacementpurposes. New designs are covered by ISO 8062 : 1994.
Owing to the lack of empirical data, general tolerances have not been specified here for angular dimensions.If angles are to meet accuracy requirements, these shall be indicated as individual tolerances.
2Normative references
This standard incorporates, by dated or undated reference, provisions from other publications. Thesenormative references are cited at the appropriate places in the text, and the titles of the publications arelisted below. For dated references, subsequent amendments to or revisions of any of these publicationsapply to this standard only when incorporated in it by amendment or revision. For undated references, thelatest edition of the publication referred to applies.DIN 1680-1DIN 1680-2DIN 1725-2
Rough castings – General tolerances and machining allowances – GeneralRough castings – System of general tolerances
Aluminium casting alloys – Sand casting, gravity die casting, pressure die casting andinvestment casting
DIN 1729-2Magnesium casting alloys – Sand casting, gravity die casting, pressure die castingDIN 7182-1Sizes, deviations, tolerances and fits – Basic concepts
ISO 8062 : 1994Castings – System of dimensional tolerances and machining allowances
3Concepts
See DIN 7182-1 and DIN 1680-1 for the terms ‘general tolerances’ and ‘tolerance grade’, and DIN 1680-1for a definition of ‘machining allowance’.
Continued on pages 2 to 4.
Translation by DIN-Sprachendienst.
In case of doubt, the German-language original should be consulted as the authoritative text.
©No part of this translation may be reproduced without the prior permission ofDIN Deutsches Institut für Normung e.V., Berlin.
Beuth Verlag GmbH, D-10772Berlin, has the exclusive right of sale for German Standards (DIN-Normen).
Ref.No.DIN1688-1:1998-08
English price group06
Sales No.0106
11.98
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