This standard specifies the general requirements for cutting parts, general tolerances for linear dimensions, general tolerances for angular dimensions, general tolerances for shape and position tolerances, etc. This standard is applicable to all types of cutting parts. JB/T 8828-2001 General Technical Requirements for Cutting Parts JB/T8828-2001 Standard download decompression password: www.bzxz.net

ICs25.010
Standard of the Machinery Industry of the People's Republic of China
JB/T8828-2001
Common Specification for Cutting2001-05-23 Issued
China Machinery Industry Federation
20-01-10-01 Implementation
JB.T8828—2001
This standard is a revision of the general technical conditions for cutting of B/T8828-·199. During the revision, the technical content, writing and format were modified. The concept of "general tolerance" was introduced to replace the original "unnoticed tolerance". The unnoticed tolerance values ​​of the coaxiality and total runout of the drawing group were cancelled. It is consistent with the current standards of limit and offset, shape and position. 4 This standard replaces JB/T8828-1999 from the date of implementation. This standard was proposed and managed by the National Technical Committee for Standardization of Machine Shafts and Accessories. The drafting units of this standard are: Mechanical Science Research Institute, Beijing No. 1 Machine Tool Factory, Shanghai Machine Tool Factory, Shijiazhuang Main Sprocket Factory. The main drafters of this standard are: Ming Cuixin, Ding Zaolong, De Mingchong, Liu Maojiang. This standard was first issued in February 1987 as ZBJ38001-1987, and the standard number was adjusted to JBJ828-1999 in April 1999. This is the first revision.
1 Scope
Mechanical Industry Standard of the People's Republic of China for Cutting Parts, General Technical Conditions
Common Speci?cations for Cutting JB 8828—2001
Generation JD/T 8828-1999
This standard specifies the general requirements for cutting parts, general tolerances for linear dimensions, general tolerances for angular dimensions, general tolerances for shape and position tolerances, etc.
This standard is applicable to all types of cutting parts. Referenced Standards
The following clauses are included: The clauses of this standard are constituted by reference in this standard. When this standard is published, the versions shown are valid. All standards will be revised. All parties using this standard shall discuss the possibility of using the latest versions of the following clauses. GB/T 3—1997
GB7T145—1985
OB.T1184—1996
GB/T 1804—2000
GB/T5277—1985
GB/T 6403.4—1986
3-Requirements
Ordinary thread finish, shoulder distance, setback and chamfer center hole
Shape and position tolerances Unspecified tolerance values
General tolerances Unspecified tolerances for linear and angular dimensions Fasteners Bolts and screws through holes
Seasoning parts to round and round angles
3.1 All parts processed by cutting shall comply with the requirements of the product sample and this standard. 3. The working surface of the machined parts shall not have defects such as scratches that affect performance, life or external hardness, silicon, etc. 3.3 Unless otherwise specified, the processed zero-shaped parts are not allowed to have sharp edges, sharp corners and burrs. 3.3.1 When the angle height is not specified in the zero-shaped part drawing, the chamfer should be in accordance with the provisions of Figure 1 and Table [. Figure 1
丧！ Angle
> 5-30
Approved by China Machinery Industry Federation on 2001-05-23>30-100
>100-250
>250-509
> 500-10:00
2001-10-01
JB/T 8828-2001
When the fillet radius is not specified in the handpiece drawing and there is no root cleaning requirement, it should be filleted according to the provisions of Figure 2 and Table 2. Figure 2
Table 2 Fillet radius
>10 -30
Note: Non-cylindrical surfaces can be rounded according to this:
11D is used for filleting
512-30
> 30-80
>30-80
>80~260
3.4 ​​For roller-finished parts, there shall be no peeling on the surface after roller-finished.>KIF140
>264-630
> 140-2(10
≥63heart~10
3.5 Heat-treated parts, and the surface of the parts after auxiliary treatment shall not have defects such as scratches and cracks that affect performance and life. 3. Marking is not allowed on the matching surfaces (rate withdrawal surfaces and positioning surfaces, etc.) after stone sugar processing mm
3,7 For those who use general tolerances, they may not indicate their tolerances separately on the drawings, but make a general description on the drawings, technical requirements or technical documents (such as enterprise standards). Table 4 General tolerances for load-bearing dimensions in accordance with the provisions of GB/T104-04 and GB/T1184
4.1 The limit deviation of linear dimensions (excluding fillet radius and chamfer height) shall be selected according to the f and m grades in Table 1 of GB104-200. The total values ​​are shown in Table 3
Table 3 Limit deviation values ​​of linear dimensions
(class)
m Medium grade>
> 30~-120
Size segment
>120-400
> 4KI-HO
>10(K-200)
> 200J-4U4
Chamfer height and radius are selected according to the provisions of GB/T6403.4, and the limit deviation values ​​of the size are selected according to the t grade and m grade in Table 2 of 02/T1804-20004.2
, Figures 3 and 4
F(Hui Xiong)
m(Medium grade)
General tolerance of period size
JB/T 8828--2001
The extreme deviation of the semi-light and chamfer height of the chamfer is selected according to Table 3 of GBT1B-2000, and its values ​​are shown in Table 5. Table 5 The extreme deviation of the virtual size of the angle
m[Medium?
【Coarse paper】
>10~50
>50~120
>120~400
Above 102
Note: The length value is determined according to the known side length. If it is not confirmed, when the amplitude is L:3-1:504, it is determined according to the sense length: for the west of the centimeter greater than 1:3, it is determined according to the required line length.
The extreme tolerance of shape and position tolerance
6.! General tolerance of form tolerance
Line library and flatness
The unnoted tolerance values ​​of straightness and flatness on the drawing shall be selected according to Grade H or Grade K in Table I of GB/T 1184-1996, and the values ​​are shown in Table 6. Table 6 Unnoted tolerance values ​​of straightness and flatness Measurement element table
Surface micro-degree point
0.01-1.60
Straightness and
Flatness
Public grade
Measured element size L
100-300
Tolerance value || tt||>10X-3I0
Calculation: For the measured dimension, the tolerance value for straightness is the length dimension of the measured dimension, and the tolerance value for flatness is the maximum dimension of the entire measured dimension on the surface. 4.
6.1.2 The unnoted tolerance value of roundness on the drawing is equal to the tolerance value of straightness, but should not be greater than the radial runout value in Table 4 of GB/T1184-1996. The value is shown in Table 7.
Unnoted tolerance value of circular spot
Diameter runout valuebzxz.net
6.2 General tolerance of position tolerance
6.2.1 Parallelism
JET88281001
The technical tolerance value of parallelism is equal to the tolerance value of the given dimension, or the corresponding tolerance value of the straightness and flatness tolerance, whichever is larger. The longer of the two elements should be taken as the reference. If the lengths of the two elements are equal, either element can be selected as the reference. 6.2.2 Symmetry
The difference between the two elements in the figure (except for the difference) is selected according to the K level in Table 3 of GB/T1184-1996, and its value is 622.1
Table name. Symmetry should take the larger of the two elements as the reference, and the shorter one as the measured element: if the two elements are equal in length, one of them can be selected as the reference.
Table symmetry tolerance values
Basic length
>100-300
>3(--1KM)
>1(KK--3000
The tolerance values ​​of chain symmetry are selected from the 9th grade in Table B4 of GB/T1184-[996], and the values ​​are shown in Table 9. Table 9 Tolerance values ​​of chain symmetry
Chain width8
>6~10
> 10-18
>30~50
>54--100
6.2.3 Verticality
Special tolerance value
The unmarked reference value of verticality on the drawing shall be selected in accordance with the provisions of Table 2 of GB/T1184-1996. The values ​​are shown in Table 10. The longer side of the two sides of the right angle is taken as the reference, and the shorter side is taken as the measured effect; if the two lengths are equal, the north side can be taken. The edge is used as the reference.
10 Vertical tolerance value in meters
6.2.4 Coaxial bottom
Length range
>100-300
>300~1000
>E000~3000
Under the limit condition, the allowable tolerance value of the servo-axis can be equal to the unnoted tolerance value of the radial circular motion specified in the table. Two JB/T8828 should be selected -2001
The longer of the two elements is the same, if the lengths of the two elements are equal, then any one of them can be used as the reference. 6.2.5 Figure runout
The unnoted tolerance values ​​of the runout (radial, end face and oblique) are shown in the table. For the unnoted tolerance values ​​of the runout, the support surface given by the design or process should be used as the reference, otherwise the longer of the two elements should be used as the reference: if the lengths of the two elements are equal, then any one of them can be used as the reference. 6.2.6 Limit deviation of center distance
When the drawing does not specify the limit deviation, it shall be in accordance with the provisions of Table 11. The size of bolts and studs shall be selected according to GB/T5277. Table 11 Limit deviation of center distance between any two screws and screw holes Screw size
Any screw hole
Center distance limit
Any screw hole
Center distance limit
M8~M10
± 0:12
M12~M18M20-M24
3127-M30
1 The processed thread surface is not allowed to have defects such as skin, random buckle and roughness, M36--M42
7.2 The tail, shoulder, back groove and chamfer dimensions of ordinary threads shall comply with the corresponding provisions of GB/T 3, Center hole
If the center hole is not indicated in the national sample of the part, and the center hole is required during processing, it can be retained without affecting the use and appearance. The type and size of the center hole shall be selected according to the provisions of GB/T 145.
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