Baixe Norma DIN 7168 e outras Notas de estudo em PDF para Informática, somente na Docsity! m m- m 01 a E xm Z° m o • W 9 m m v m m• = z C • m ao . v E ° m z C, m I Aft / - UDC 621 . 753.1 : 621 .7 : 621 .9 : 744.43 o` 5 c cCL m 0 - m~ o m L C 3 m • r• = v m o c~ 0. m L -o A0. 0 Z DEUTSCHE NORM Beuth Verlag GmbH, Berlin, has the exclusive right of sale for German Standards (DIN-Normen). 10.91 April 1991 General tolerances for Iinearand angular dimensions and geometrical=.tolerances (not to be used for .new destgns) .'-j' ;,, DIN 7168 Allgemeintoleranzen ; Langen- and Winkelma8e,Form and=Lage& ' Supersedes May 1981 (nicht fur Neukonstruktionen) '.. .'7' 1 edition of DIN 7168 Part 1 and July 1986 This standard is not to be used for new designs . General tolerances for these are now covered by ISO 2768 Parts 1 and 2 . See also clause 1 and the Explanatory notes . 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 . 1 Scope This standard is intended to ensure that all drawings prepared to date in which general tolerances have been specified on the basis of DIN 7168 will remain intelligible and be interpreted correctly, and also to inform the user of this standard that, for all new designs, tolerances are to be specified on the basis of ISO 2768 Parts 1 and 2 . 2 Field of application General tolerances as specified in this standard are • applicable for the dimensions of parts produced by metal removal (i .e . chip removal)'), unless this involves specia! manufacturing processes for which other standards speci- fying general tolerances apply . General tolerances as specified here shall apply when reference is made to this standard in drawings or asso- ciated documents (e .g. delivery conditions) in accordance with clause 5 . If special general tolerances are specified in accordance with other standards (cf. page 6), the standards concerned shall be indicated on the drawing or in the associated documents. If, in cases where production specifications contain references to more than one standard on general tolerances, there is any doubt as to which standard is to apply for a given linear or angular dimension, then the standard specifying the larger tolerance shall be deemed • to apply . Accordingly, a dimension between an unfinished and a • finished surface on a blank (e .g. on a casting blank or• forging blank), for which no individual tolerance has been indicated, will be required to meet the general tolerance given in the relevant standard on blanks, provided that is indeed the larger tolerance. However. for a dimension between two finished surfaces, the general tolerance specified in DIN 7168 shall always apply . Production specifications in which linear or angular dimen- sions (but not auxiliary dimensions) appear without individ- ually indicated tolerances shall be considered incomplete if there is no reference, or inadequate reference, to general tolerances . General tolerances as specified in this standard apply for : a) linear dimensions, such as external sizes, internal sizes, step sizes, diameters, clearances (cf . table 1), external radii and chamfer heights for broken edges (cf . table 2) ; b) angular dimensions (cf . table 3), both those indicated and those not usually indicated on drawings, such as 90° angles or the angles of regular polygons : c) linear and angular dirrfeensions produced by machining assembled parts : d) workpiece features for which no individual tolerances of form and position are indicated . General tolerances as specified in this standard do not apply for : a) linear and angular dimensions and workpiece features for which tolerances have been individually indicated ; b) linear and angular dimensions and workpiece features for which other standards on general tolerances are specified in drawings or associated documents ; c) auxiliary dimensions enclosed in brackets (cf . DIN 406 Part 2) ; d) theoretically exact dimensions enclosed in rectangular frames as specified in ISO 1101 ; e) angular dimensions on circular graduations ; f) 90° angles, not indicated on the drawing, between lines forming coordinate axes : linear and angular dimensions produced by the assem- bly of parts ; h) workpiece features which are not produced by removal of material, in accordance with the indication of a semi- finished product on drawings . ') For concepts relating to manufacturing processes . see DIN 8580 . Continued on pages 2 to 7 g) DIN 7168 Engl . Price group 8 Sales No .0108 •' • • ' Page 2 DIN 7168 3 General tolerances for linear and angular dimensions 3.1 Linear dimensions Table 1 . Permissible deviations for linear dimensions, except for external radii and chamfer heights Table 2. Permissible deviations for external radii, r (cf . figure 1 for example), and chamfer heights, h (cf . figure 2 for example) 3.2 Angular dimensions General tolerances for angular dimensions apply irrespec- tive of the actual dimensions of the lengths, i .e . the angular deviations may occur both on workpieces with maximum- material sizes and on workpieces with minimum-material sizes . The upper and lower deviations do not limit the form deviations of the legs or surfaces forming the angle . Note. In the case of workpieces exhibiting deviations of form, the angle is defined by the direction of the straight lines or planes applied to the two angle legs under the minimum material conditions (cf . ISO 1101 for the definition of the minimum condi- tion) . Table 3. Permissible deviations for angular dimensions 4 General geometrical tolerances 4.1 Tolerancing principle as specified in ISO 8015 General tolerances based on the tolerancing principle specified in ISO 8015 are only to be applied when the drawing concerned contains the reference 'Tolerancing to ISO 8015'. Where that is the case. the general geometrical tolerances (i .e . the tolerances of form and position) apply independently of the actual local sizes of the workpiece feature . Each individual tolerance requirement must be met. The general geometrical tolerances may thus also be applied even if the features are everywhere at their maximum material size. For fits, the envelope requirement must also be specified, and this shall be individually indicated on the drawings (cf . Explanatory notes) . 4 .1 .1 General tolerances of form 4 .1 .1 .1 Straightness and flatness The general tolerances on straightness and flatness shall be as specified in table 4 . Tolerances on straightness shall be selected from the table on the basis of the length of the corresponding tine, while, for flatness tolerances, selec- tion shall be based on the longer lateral length of the surface, or on the diameter of the circular surface . 4 .1 .1 .2 Circularity The general tolerance on circularity shall be equal to the numerical value of the diameter tolerance, but in no case shall it be greater than the respective tolerance on radial run-out given in table 6 (cf . Explanatory notes) . Tolerance class for from 0,5 1 ) to 3 Permissible nominal over 3 up to 6 deviations, sizes, over 6 up to 30 in in mm . over 30 up to 120 mm, over 120 up to 400 f (fine) ±0,2 ±0,5 ±1 _2 ±4 m (medium) g (coarse) .0,2 ±1 ±2 t4 ±8 sg (very coarse) For nominal sizes below 0 .5 mm, the deviations shall be indicated adjacent to the relevant nominal size . Permissible deviations, in units of angle, for nominal sizes of the shorter leg, in mm, Tolerance class over 10 over 10 up to 50 over over 50 120 up to up to 120 400 over 400 f (fine) T 1 ° ±30'1±20' i ±10' ± 5 ' m (medium) g (coarse) ± 1° 30' I I± 50' i ± 25' I ± 15' 1± 1 0' sg (very coarse) = 3° i 2 ° - 1 ° ± 30' ± 20' Tolerance class from 0,5') to over 3 up to over 6 up to Permissible over 30 up to deviations, over 120 up to in mm, over 400 up to over 1000 up to for nominal over 2000 up to sizes, in mm, over 4000 up to over 8000 up to over 12000 up to over 16000 up to 3 6 30 120 400 1000 2000 4000 8000 12000 16000 20000 f (fine) ± 0,05 I ± 0,05 ± 0,1 ± 0,15 ± 0.2 ± 0,3 ± 0,5 ± 0,8 - - m (medium) ±0,1 10,1 ±0,2 ±0,3 ±0,5 ±0,8 ±12 ±2 ±3 ± 4 I .± 5 I t 6 g (coarse) ± 0,15- ± 0,2 ± 0,5 ± 0,8 ± 1,2 ± 2 ± 3 ~ ± 4 ± 5 ± 6 ± 7 I ± 8 sg (very coarse) - ± 0,5 ± 1 ± 1,5 ± 2 ± 3 ± 4 ± 6 ± 8 ± 10 ± 12 ± 12 ') For nominal sizes below 0,5 mm, the deviations shall be indicated adjacent to the relevant nominal size . 19 The above tolerances on radial run-out may also obtain in the case of workpieces at their' maximum material size', but this 46 does not apply to axial run-out tolerances, because axial run-out must always lie within the linear tolerances . 5 Designation and indication on drawings of general tolerances as specified in DIN 7168 5 .1 Designation of general tolerances for dimensions, only Example : DIN 7168 - m DIN number Tolerance class m as per clause 3 of this standard 5 .2 Designation of general tolerances based on ISO 8015 Example : DIN 7168 - m - S DIN number Tolerance class m as per clause 3 for size tolerance Tolerance class S as per subclause 4 .1 for tolerances of form and position 5 .3 Designation of general tolerances based on principle of `envelope requirement without indication on drawing' as per DIN 7167 Example : a Table 8 . General tolerances on radial run-out In the relationship between axially symmetrical features, and general tolerances on axial run-out DIN 7168 Page 5 Tolerance class Tolerance on radial and axial run-out, in mm 02') 0,02 01 1 ) 0,05 A a 0,1 B 0,2 C 0,5 D 1 ' Mainly applies for precision engineering applications . e Page 6 DIN 7168 Standards referred to DIN 406Part2 Indication of dimensions on drawings = = e DIN 7167 Relationship between dimensional and geometrical tolerancing; envelope requirement without individual tolerance indications - DIN 8580 (at present at the stage of draft) Manufacturing processes; concepts and classification - ISO 1101:1983 Technical drawings; geometrical tolerancing; tolerancing of form, orientation, location and run-out; “generalities, definitions, symbols, indications on drawings ISO 2788 Part 1:1989 Tolerances for linear and angular dimensions without individual tolerance indications ISO 2768 Part 2:1989 Geometrical tolerances for features without individual tolerance indications ISO 8015:1985 Technical drawings; fundamental tolerancing principle Other relevant standards DIN 1680 Part 1 Rough castings; general tolerances and machining allowances; general E . DIN 1680 Part 2 Rough castings; general tolerances DIN 1683 Part 1 Rough castings; general tolerances and machining allowances DIN 1684 Part 1 Rough castings of malleable iron; general tolerances and machining allowances DIN 1685 Part 1 Rough castings of grey iron with nodular graphite; general tolerances and machining allowances DIN 1686 Part 1 Rough castings of grey iron with flake graphite; general tolerances and machining ailowances DIN 1687 Part1 Heavy metal alloy rough castings; sand castings; general tolerances and machining allowances DIN 1687 Part3 Heavy metaí alloy rough castings; chilled mould castings; general tolerances and machining 2 allowances DIN 1687 Part 4 Heavy metal alloy rough castings; diecastings; general tolerances and machining allowances DIN 1688 Part 1 Light metal alloy rough castings; sand castings; general tolerances and machining allowances DIN 1688 Part3 Light metal alloy rough castings; chilled mould castings; general tolerances and machining allowances DIN 1688 Part 4 Light metal alloy rough castings; dicastings; general tolerances and machining allowances DIN 6129 Packaging materials; glass bottles and hollow bodies; permissible deviations for dimensions without tolerance indication in the case of botties manufactured fully automatically DIN 6930 Part 2 Stamped steel parts; cut parts from flat products; dimensions and permissible deviations DIN 7526 Steel forgings; tolerances and permissible deviations for drop forgings DIN 8570 Part 1 General tolerances for welded structures; linear and angular dimensions DIN 8570 Part3 General tolerances for welded structures; geometrical tolerances DIN 28005 Part 1 General tolerances for vessels; general purpose vessels DIN 58 165 Permissible deviations for optical components; dimensions without individual tolerance indication: material and machining defects Previous editions DIN 7168: 02.56, 04.60, 03.66; DIN 7168 Part 1: 08.70, 08.77, 10.79,05.81; DIN 7168 Part 2: 01.74, 10.79, 05.81, 8 07.86. E de Amendments The May 1981 edition of DIN 7168 Part 1 and the July 1986 edition of DIN 7168 Part 2 have been combined in one standard, the scope of which has been designated as not being applicable for new designs (see Explanatory notes). Explanatory notes When this standard was being revised prior to publication ofthe August 1977 edition, the aim was already to arrange the content of the two Parts of the standard so that they would complement each other as much as possible. Initially, the introduction in Part 2 of a table giving tol- erances on perpendicularity and inclination was planned, supplementary to table 3 in DIN 7168 Part 1. After thorough examination, however, this idea was abandoned. The reasons for this are given in the Explanatory notes to DIN 7168 Part 2 (May 1981 edition). In the past, misunderstandings and difficulties were fre- quently experienced in connection with the values in mm per 100 mm then still specified in table 3. For this reason, the corresponding column in the table has been omitted, and permissible deviations are now given in units of angle, only. For cases where metrological reasons require angu- lar dimensions to be converted into linear dimensions, the tangent values for the individual angles have been listed in table 9 below. The present standard should not be used for new designs, these now being covered by ISO 2768 Parts 1 and 2. The ISO Standards are largely based on the specifications of the former DIN Standards. For further details, please consult International Patent Classification G018B21/00 G01821/02 é G01B21/22 the national forewords to the German editions of ISO 2768 Parts 1 and 2. ; The Explanatory notes in the earlier editions of DIN 7168 Parts 1 and 2 explained in detail the concepts behind the tolerancing specifications. These explanations have not been included in this edition. However, as this edition is, in terms of its content, an otherwise unaltered combination of the earlier standards, the explanations concerned remain relevant for the specifications made here. Table 9. Angles and their tangent values Angle Tangent - Angle Tangent ÃO” 0,0029 30" 0,0087 15º 0,0044 50" 00145 20" 0,0058 + 0,0175 as 0,0073 1º 30" 0,0262 &