This standard specifies the dimensional deviation of aluminum and aluminum alloy extruded profiles. It includes the cross-sectional dimensional deviation, cross-sectional angle deviation, curvature, twist, plane clearance and other contents of the profile. This standard is applicable to aluminum and aluminum alloy extruded profiles. GB/T 14846-1993 Dimensional deviation of aluminum and aluminum alloy extruded profiles GB/T14846-1993 Standard download decompression password: www.bzxz.net

National Standard of the People's Republic of China
Dimensional Tolerances of Aluminium and Aluminium Alloy Extruded Profiles
Wrought aluminium and aluminium alloyextruded profiles--Tolerances on dimensions and shapeSubject Content and Scope of Application
GB/T1484693
This standard specifies the dimensional tolerances of aluminium and aluminium alloy extruded profiles of equal cross-section. It includes the cross-sectional dimensional deviation, cross-sectional angle deviation, curvature, twisting, plane clearance and other contents of the profile. This standard applies to aluminium and aluminium alloy extruded profiles of equal cross-section (hereinafter referred to as plastics). 2 Classification and Grading
2.1 Aluminium and aluminium alloy extruded profiles are classified into 4 categories according to their composition, as shown in Table 1. Table 1
Profile category
(Hard profile)
(High magnesium profile)
(Precision profile)
(Soft profile)
Composition group
Aluminum-copper alloys (such as LY12, LD10, etc. and alloys equivalent to the international standard 4-digit grade 2XX×) and aluminum-zinc alloys (such as LC4, I.C9, etc. and alloys equivalent to the international standard 4-digit grade 7×××) Aluminum-magnesium alloys with an average magnesium content greater than or equal to 3% (such as LF3, IF5, etc. and alloys equivalent to the international standard 4-digit grade 5×××)
LD3G, LD31 and alloys equivalent to the international standard 4-digit grade 6061, 6063 Other aluminum and aluminum alloys
2.2 The dimensional deviation classification of profiles is shown in Table 2. Table 2
Cross-sectional dimension deviation
Cross-sectional angle deviation
Bending
Waviness
Plane clearance
Twisting
Cutting slope
Surface clearance
Corner radius deviation
Approved by the State Administration of Technical Supervision on December 24, 1993 128
Classification
Ordinary, high Fine grade, ultra-high-precision grade
Unclassified
1994-06-01 implementation
3 Dimensions and allowable deviations
3.1 Cross-sectional dimension deviations
GB/T14846~93
3.1.1 For the cross-sectional dimension deviations of profiles, see Table 3 for ordinary grades, Table 4 for fine grades, and Table 5 for ultra-high-precision grades. 2 The division of columns 2 to 9 in Tables 3 to 5 is shown in Figure 1. The method of using the allowable deviation of cross-sectional dimensions is as follows: 3. 1. 2
GB/T14846--93
00T~09
001~05
14846-93
5～00
001～09
好'%02
￥'%02||tt ||095~009
009~00bzxZ.net
02~9
001~0g
GB/T14846-9
002~0S
001~09<
“%01
001~0g
14846--
[oS1～001
001~09<
?酱·%S
GB/T14846-93
S～001
001～09
厚最县
GB/T14846—93
001～09≤
05～00<
09～0
st~00%
09~001
GB/T14846—93
3.1.2.1 consists of two When the sub-dimensions on a dimension form a dimension, the allowable deviation of the dimension is the sum of the allowable deviations of the dimensions of each part. 3.1.2.2 In Figure 2, Y is the metal entity dimension, and its allowable deviation is in 2 columns. 3.1.2.3 In Figure 2, X is the dimension including the space. When the solid metal part in the dimension is not less than 75% of X, its allowable deviation is in 2 columns; when the solid metal part in the dimension is less than 75% of X, its allowable deviation is in 4 columns. Figure 2
3.1.2.4 The width B and height H of the hollow profile shown in Figure 3, the allowable deviation of the size is determined by the following method: the allowable deviation of the width B is the height H in 4 columns Similarly, the allowable deviation of height H is the value corresponding to width B in column 4. However, when the value in column 4 is less than the value corresponding to width B (or height H) itself in column 2, column 2 is used. For example: LD31RCS hollow profile with high-precision dimensional deviation, its width B is 60mm, height H is 30mm, side: the allowable deviation of width B (B is 60mm) is the value corresponding to height H (H is 30mm) in column 4 in Table 4, which is 0.53, but because the value corresponding to width B itself in column 2 is 0.61, the allowable deviation of width B is determined to be ±0.61.136
GB/T 14846 --93
Similarly, the permissible deviation of height H is ±0.86 of the value corresponding to width B in column 4 of Table 4, while the value corresponding to height H in column 2 is ±0.30, so the permissible deviation of height H is determined to be ±0.86.3.1.2.5 For the profiles shown in Figures 4 and 5, the dimensional deviation of X or Z does not adopt the value corresponding to column 2 (even if the metal solid part Y exceeds 75% of X), but adopts the value corresponding to the reference dimension L in columns 4 to 9. However, when L≤6mm, the value in column 2 is taken as the permissible deviation of X or 2.
3.1.2.6 For the profiles shown in Figures 6 to 12, the permissible deviation of the opening dimension X adopts the value corresponding to the base dimension L in columns 4 to 9 (but when L≤6mm, the permissible deviation of X adopts the value in column 2). At the same time, dimension A is not suitable as the reference dimension here. Figure 6
GB/T14846-93
3.1.2.7 For the profiles shown in Figures 13 and 14, the size deviation of the opening size X adopts B as the designated size in column 1, and the value corresponding to the reference size L in columns 4 to 9 (when L≤6mm, the value in column 2 is taken) is taken as the deviation value. 138
GB/T14846-93
3.1.2.8 For the hollow profiles shown in Figures 2 and 3, when the enclosed hollow area is less than 70mm2, the allowable deviation of the wall thickness adopts column 2; when the enclosed hollow area is not less than 70mm2, the allowable deviation of the wall thickness adopts column 3. If the wall thickness of two pairs of sides is not equal, the average value of the wall thickness of the two pairs of sides shall be used as the designated size in column 1, and the value in column 2 or column 3 shall be taken as the allowable deviation of the wall thickness of both sides. 3.1.2.9 For the profile shown in Figure 14, when the hollow area S enclosed by the profile is less than twice the square of the width X of the opening part (i.e. S<2X2), its wall thickness deviation shall be in accordance with column 2; when the hollow area S enclosed by the profile is not less than twice the square of the width X of the opening part (i.e. S=2X\), its wall thickness deviation shall be in accordance with the provisions of hollow profiles in Article 3.1.2.8. 3.1.2.10 When the wall thickness T of the hollow profile (including the profile with S≥2X in Figure 14) is greater than or equal to 3 times the wall thickness of the opposite side (as shown in Figures 2 and 14, T=3t), its wall thickness deviation shall not be in accordance with the provisions of Tables 3 to 5, but shall be negotiated by the supply and demand parties. 3.2 Cross-sectional angle deviation
The cross-sectional angle deviation of the profile shall be selected in accordance with Table 6. Table 6
Profile category
A, B, D
Ordinary grade
High precision grade
Note: When the angle deviation is required to be all positive or all negative, the deviation shall be twice the value in Table 6. 3.3 Curvature
Ultra-high precision
3.3.1 The curvature of the profile is the maximum clearance between the bottom of the profile and the platform measured along the length direction of the profile when the profile is placed on the platform and the bending is stabilized by the weight (h,), or the maximum clearance between the ruler and the profile surface measured by placing a 300mm long ruler on the surface of the profile along the length direction of the profile (h,), as shown in Figure 15. Wedge-shaped profiles and profiles with rounded heads should also be checked for lateral curvature (knife curvature). The lateral curvature shall not exceed 4mm per meter length, 4×Lmm per meter length, and 30mm at most. 139
Tip: This standard content only shows part of the intercepted content of the complete standard. If you need the complete standard, please go to the top to download the complete standard document for free.