ICS 77.140.80
Descriptors:General tolerances, machining allowances, castings,
spheroidal graphite cast iron.Gußrohteile aus Gußein mit Kugelgraphit – Allgemeintoleranzen,Bearbeitungszugaben (Nicht für Neukonstruktionen)
In keeping with current practice in standards published by the International Organization for Standardization (ISO), a comma has been ud throughout as the decimal marker.
DEUTSCHE NORM August 1998
1685-1
{
Continued on pages 2 to 4.
Translation by DIN-Sprachendienst.
In ca of doubt, the German-language original should be consulted as the authoritative text.
Rough castings of spheroidal graphite cast iron
General tolerances and machining allowances
(For replacement purpos only)
Superdes
October 1980 edition.
Dimensions in mm
1Scope and field of application
This standard specifies general tolerances and machining allowances for rough castings of spheroidal graphite cast iron which are subject to the technical delivery conditions laid down in DIN 1693-1.
Urs of this standard should note that it now only applies to castings ud for repair and replacement purpos. 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, the shall be indicated as individual tolerances.
2Normative references
This standard incorporates, by dated or undated reference, provisions from other publications. The normative references are cited at the appropriate places in the text, and the titles of the publications are listed below. For dated references, subquent amendments to or revisions of any of the publications apply to this standard only when incorporated in it by amendment or revision. For undated references, the latest edition of the publication referred to applies.DIN 1680-1Rough castings – General tolerances and machining allowances – General DIN 1693-1Spheroidal graphite cast iron – Unalloyed and low alloy grades DIN 7182-1
Sizes, deviations, tolerances and fits – Basic concepts
ISO 8062 : 1994
玫瑰醋的功效Castings – 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’.
4
Tolerance grades
4.1
Dimensional deviations
For castings of spheroidal graphite cast iron, dimensional deviations are largely dependent on
a)the dimensional accuracy of the pattern, the degree of shrinkage dependent on the material type and casting configuration, the care taken during moulding and casting, and the moulding and casting equip-ment ud bad on the batch size;b)the nominal sizes.
4.2Application of tolerance grades
Limit deviations shall be specified on the basis of the tolerance grades given in tables 1 and 2. Linear dimensions and thickness shall be specified for the same grade; for exceptions e DIN 1680-1.
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Page 2
DIN 1685-1:1998-08
4.3Nominal size ranges
The nominal size ranges shown in the tables for each tolerance grade have been lected on the basis of reliable measurement data. For sizes outside the range for a given grade, the next coarst grade applies.
5Machining allowances
The machining allowance, BZ , is a function of the largest external dimension of the casting and is the same for all tolerance grades (cf. table 3); e DIN 1680-1 for exceptions.
For sizes up to 500 mm, machining allowances may be reduced to approximately half the values specified in table 3 if the pattern equipment, casting procedure and machining procedure with regard to clamping surfaces and datum surfaces have been optimized, for example, for ries production, as agreed between the customer and the foundry. The reduced values are shown in table 4.
For castings with a mass greater than 1000kg or a wall thickness greater than 50mm, the machining allow-ances shall be agreed between the manufacturer and client.
6Designation
Where both the tolerance grade and the machining allowance have been lected on the basis of the prent standard, the designation of a grade GTB 17 tolerance (GTB 17) in conjunction with a machining allowance of 2,5 for bottom and side surfaces in the die and of 3 for top surfaces (BZ 2,5/3), for example, shall be designated as follows:
Tolerance and machining allowance DIN 1685 – GTB 17 – BZ 2,5/3
See DIN 1680-1 for other examples of designations.
Table 1:Limit deviations for linear dimensions
(length, width, height, centreline distance, diameter, radius)*)
*)Irrespective of the values given in this table, the actual deviation of the linear dimensions of a casting shall in no ca be greater than t 25 % of the nominal size, rounded to one decimal place. This restriction is of particular relevance when applying the deviations in the boxes enclod by thick lines.**)The values specified here are taken from the deviations specified for one full grade coarr in table 1.
Tolerance grade
Nominal size range
Up to 6
Over
up to
Over up to
Over up to
Over up to
Over up to
Over up to
Over up to
Over up to Over up to Over up to Over up to Over up to Over up to Over up to Over up to Over up to Over up to Over up to Over up to Over up to Over up to Over up to Over up to Over up to Over up to Over up to Over
up to
Up to
18
Toler-ance grade角瓜馅饺子
Nominal size range祝福事业的祝福语
*)Irrespective of the values given in this table, the actual deviation of the linear dimensions of a casting shall in no ca be greater than t 25 % of the nominal size, rounded to one decimal place. This restriction is of particular relevance when applying the deviations in the boxes enclod by thick lines.
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DIN 1685-1:1998-08
7Indicating general tolerances on existing drawings
If an existing drawing does NOT refer to the tolerance groups specified in the 1962 edition of this standard (which is no longer valid), then the tolerance grades given in tables 1 and 2 do not apply. It is recommended that a grade suitable for the casting in question be indicated on such drawings.
If an existing drawing DOES refer to the previously valid tolerance groups, it is recommended that the be converted to the tolerance grades specified in tables 1 and 2 of the prent standard. If thi
s is not possible,the permissible limit deviations are to be taken from tables 5 and 6 below.Tables 5 and 6 do NOT apply to new drawings.
Table 5:Limit deviations for linear dimensions on existing drawings
Table 3:Machining allowances
Table 4:Reduced machining allowances, BZ (e clau 5)
Over up to
眼下有痣Over up to
Over up to
Over up to
Over up to
Up to 50
Position of surface in mould
读狼王梦有感
Nominal size range (bad on the largest overall dimension of casting)Bottom, side Top
Machining
allowance, BZ
Machining
allowance, BZ
Nominal size range (bad on the largest overall dimension of casting)Bottom, side Top
Position of surface in die
Up to 50
Over up to
Over up to
Over up to
狼干综合
Table 6:Limit deviations for thickness
on existing drawings
Tolerance group
Tolerance group
External dimensions Internal dimensions External dimensions Internal dimensions
Nominal size range
Nominal size range
Over
up to
Over up to
Over up to
Over up to
Up to
18
Over
up to
咳嗽喝蜂蜜水有用吗Over up to
Over up to
For centreline distances, the limit deviations specified for internal dimensions shall be ud.
Up to
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Page 4
坚持的诗句
DIN 1685-1:1998-08
8Indicating machining allowances on existing drawings
The machining allowances specified in this standard only apply to drawings on which general tolerances in accordance with clau 4 and tables 1 and 2 of this standard are indicated.
Previous editions
DIN 1685-1: 1962-04, 1974-08, 1978-07, 1980-10.
Amendments
As compared with the October 1980 edition, the standard now applies only to castings ud for replacement purpos.
Other relevant standards
DIN 1680-2Rough castings – General tolerances
DIN 1690-1Technical delivery conditions for castings of metallic materials – General
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