JB/T 5000.9-1998 This standard specifies the general technical conditions for cutting and processing of heavy machinery products and parts. This standard applies to heavy machinery products and parts. Unless there are special provisions in product drawings and technical documents, they shall comply with the provisions of this standard. (Note: This standard is based on JB/ZQ 4000.2--86 "General Technical Requirements for Cutting Parts", with reference to German SMS company standards SN200/6-92 and SN 200/6-96 "Cutting Parts". Compiled by "Processing Specifications") JB/T 5000.9-1998 General Technical Conditions for Cutting Parts of Heavy Machinery JB/T5000.9-1998 Standard download and decompression password: www.bzxz.net

ICS25.010
J40
JB
Machinery Industry Standard of the People's Republic of China
JB/T5000.9-1998
General Technical Conditions for Heavy Machinery|| tt||Cutting parts
The heavy mechanical general techniques and standardsCutting
Released on 1998-09-30
National Machinery Industry Bureau
Released
1998 -12-01 Implementation
JB/T5000.9-1998
Previous
This standard was proposed and centralized by the Metallurgical Machinery Standardization Technical Committee of the Ministry of Machinery Industry. The unit responsible for drafting this standard: CITIC Heavy Machinery Company. The organization participating in the drafting of this standard: Xi'an Heavy Machinery Research Institute. The main drafters of this standard: Yao Longtao, Li Xueqi, and Lin Hongwei. 1Scope
Mechanical Industry Standards of the People's Republic of China
General technical conditions for heavy machinery
Cutting parts
The heavy mechanical general techniques and standardsCutting
This standard It stipulates the general technical conditions for cutting and processing of heavy machinery products and parts. This standard applies to heavy machinery products and parts. Unless there are special provisions in product drawings and technical documents, they shall comply with the provisions of this standard. 2 Reference standards
JB/T5000.9—1998
The provisions contained in the following standards constitute provisions of this standard by being quoted in this standard. At the time of publication, the editions indicated were valid. All standards are subject to revision. Parties using this standard should explore the possibility of using the latest version of the following standards. GB/T 3-1997
GB 19781
GB/T1184-1996
GB/T 180492
GB 11334—89
GB11335-89| | tt | | ZBJ38001-87 | Tolerance value
General tolerance unindicated tolerance of linear dimensions
Conical tolerance
Limit deviation of unindicated tolerance angle
General technical conditions for cutting processing
3.1 Parts processing should comply with product drawings and process specifications approved through prescribed procedures and the requirements of this standard. 3.2 Parts should be inspected and accepted according to the process. Only after the previous process passes the inspection can they be transferred to the next process. 3.3 During the processing of various steel castings, iron castings, non-ferrous metal castings, and forgings, if blisters or shrinkage holes are found When there are defects such as slag inclusions and cracks, they can be repaired in accordance with relevant regulations without reducing the strength and performance of the parts. Only after passing the inspection can the processing continue. 3.4 No burrs are allowed on the processed quarter parts. Except for special requirements, processed parts are not allowed to have sharp edges and corners. 3.4.1 When the chamfering is not specified in the actual part drawing, the chamfering should be specified in Figure 1 and Table 1. The chamfering of non-rotating fog parts can also refer to Table 1. The main parameter D(d) takes the chamfering phase. The shorter of the two adjacent sides. 3.4.2 If the chamfer size is not indicated in the parts drawing and there is no root cleaning requirement, the chamfering specified in Figure 2 and Table 2 should be followed. The rounding dimensions of non-rotating parts can also be referred to Table 2. The main parameter d is the shorter of the two adjacent sides of the rounding. Approved by the State Administration of Machinery Industry on 1998-09-30 and implemented on 1998-12-01
1
D(a)
C
DD
dd.
a
R
5
0. 2
$4
>3~10
0. 4| |tt||c×45
>5~30
0.5
>4~12
>10~30
JB/T 5000.91998| |tt||Figure 1
Table 1
>30~100
1
>12~30
>30~80||tt| |>100~250
2
Figure 2
Table 2
>30~80
>80~260
>250 ~500
3
>80~140
>260630
8
>140200
>630
～ 1000
12
>500~1000
4
>200~300
>1000
~1600
16
mm
>1000
mm
>300~500
>1600
~2500
20| |tt||3.5 Finished parts should not be placed directly on the ground. Necessary support and protection measures should be taken. The processed surface is not allowed to have rust, bumps, scratches and other defects that affect performance, life or appearance. . 3.6 Roll and finish the surface. There should be no peeling after rolling. Generally, the number of smoothing and rolling is 1 to 2 times, and strengthening processing is best not to exceed 3 to 5 times.
3.7 There should be no oxide scale on the surface of parts after heat treatment in the final process. The finished mating surfaces and tooth surfaces should not be annealed, bluish, or discolored 2
.
JB/T 5000.9—1998
3.8 Marks are generally not allowed to be printed on working surfaces such as mating surfaces, friction surfaces and positioning surfaces after finishing. 4 Unspecified tolerances
4.1 Unspecified dimensional and angular tolerances
4.1.1 Applicable countries
Applicable to dimensions with no specified tolerance requirements between two cutting surfaces (passed The dimensions of sawing and cutting short-loaded parts are not separately specified with tolerances). For the dimensions between the rough surface and the cutting surface, if the tolerance is not marked in the drawing, half of the unmarked tolerance of the rough size (according to the corresponding standard) plus the unmarked dimensional tolerance in this standard shall be used. The unmarked tolerances of this standard do not apply to:
Linear dimensions and angles marked with tolerances on drawings: parameter dimensions in brackets and theoretical dimensions in boxes; diameter dimensions and divided circles of matching hole distribution circles The angle size; the unnoted 90° angle on the cross axis; the diameter size of the indexing circumference;
The center angle corresponding to the circumferential section;
The angle (dimension) with matching;||tt| |The linear dimensions and angles formed after parts are assembled. 4. 1.2
The limit deviation of linear dimensions not noted shall comply with the provisions of Table 3. Table 3 Limit deviation of linear dimensions
Tolerance level
m slow
0.5~6
±0.1
>6
~30
±0. 2
>30
~120
± 0. 3
>120
~400||tt| |±0.5
>400
~1000
± 0. 8
>1000
~2000
±1.2||tt ||Note: When the nominal size is less than 0.5mm, the deviation is directly marked on the nominal size. 4. 1. 3bzxZ.net
The dimensional limit deviations of rounding radius and chamfering height shall comply with the provisions of Table 4. >2000
~4000
±2
>4000
~8000
±3
Table 4 Round radius and chamfer Limit deviation value of height dimension Nominal size
CC,.YY,
42
.s
2,
0.5~3||tt| |0. 2
+ 0. 2
>3~6
0. 5
+0.5
Note: When there is no coordination, the positive and negative values ????of the values ??in the table can be the limit difference of the corresponding size>6～30
1
+1
> 8000
~12000
±4
>30~120
2
+2
mm
>12000
>16000
-16000
±5
～20000
±6
mm
>120~400
4
+4
3
4. 1. 4
JB/T 5000.9—1998
The angle limit deviation should comply with According to the provisions of Table 5, the limit deviation of the angle not noted in Table 5
Length
Degree
mm
Deviation (m level)
Lubricating oil hole angle
Deviation (C level)
10
±!
±130
>10~50
±30*
±1
>50~120
±20||tt ||±30
Note: The deviation value is determined according to the length of the angular superside, and the trapped dimensional angle is determined according to the length of the circular chain cable line. 4.2 Unspecified geometric tolerance
4.2.1 Scope of application|| tt||Applies to features formed by removing material. >120～400
±10
±15
>400
± 54
±10r
Except those specified in this standard In addition to items without tolerances, other items such as line contour, surface contour, inclination, position and total runout should be controlled by the linear dimensional tolerance or angular tolerance of each element, whether it is noted or not. 4.2.2 Straightness and flatness without note of shape tolerance
shall comply with the provisions of Table 6. 4.2. 2. 1
Table 6 Unnoted tolerances for straightness and flatness
Length norm chart
Tolerance value
~10
0 . 02
>10~30
0>30~100
0. 05
0.1
>100
~300| |tt||0.2
>300
~1000
0.3
>1000
~3000
0. 4||tt ||>3000
～6000
0. 7
For flatness, the flatness should be selected according to the longer side of the surface or the diameter of the surface. Note: The straightness should be selected according to the length of the corresponding line. 4.2.2.2 The unnoted tolerance value of roundness and cylindrical degree
roundness and cylindrical degree should not be greater than the unnoted dimensional tolerance value. 4.2.3 Position tolerance not noted
4.2.3.1 Parallelism
mm
>6000
~10000
1.0
Parallelism The unindicated tolerance value is equal to the given dimensional tolerance value or the unindicated tolerance value for straightness and flatness, whichever is greater. The longer of the two requirements should be used as the basis.
4. 2. 3. 2
The verticality should comply with the provisions of Table 7.
Table 7 Verticality No Tolerance Note
Length Range
Tolerance Value
≤100
0. 2
>100~ 300
0.3
Note: The longer side of the right-angled sides is used as the benchmark, and the shorter side is used as the measured element, 4. 2. 3. 3
Main parameter|| tt||d, B, L
Tolerance group
Main parameter
dBL
Tolerance value
4
>300~ 1000
0. 4
mm
>1000~3000
0.5
Coaxiality and symmetry should comply with GB/T1184-1996 Table 2 Intermediate C level regulations, the tolerance values ??are shown in Table 8. Table 8
>1~3
0. 04
>250
~500
0. 40
G. 06| |tt||>500
~800
0. 50
>3~6
0. 08
>800
~1250
0. 60
No tolerance for coaxiality and symmetry
>6~10
0.10
>1250||tt| |~2000
0. 80
>10~18
0. 12
>2000
~3150
1. 00
>18~30
0.15
>3150
~5000
1.20
>30
~ 50| |tt||0.20
>5000
~8000
1.50
>50
~120
0. 25||tt ||>8000
～10000
2. 00
mm
>120
～250
0.30
4.2.3.4 Circular runout and total runout
JB/T5000.9—1998
The tolerance values ??of circular runout and total runout should not be greater than the combined value of the shape and position of the element without tolerances. The symmetry of the keyway is not toleranced
5
The symmetry of the keyway is not toleranced and should comply with the provisions of Table 9. Table 9 Unnoted tolerance values ??for keyway symmetry
Key fine leather
Public class
>1~3
0. 02
> 3~6
0. 025
The position tolerance of threaded holes and bolt holes is not noted>6~10
0. 03
>10~18||tt ||0. 04
The position tolerance of threaded holes and bolt holes is not noted and should comply with the requirements of Table 10. Table 10
Burning plug diameter
Through hole diameter
Through
hole
Thread effect hole
Bolt diameter
Through hole
through
hole
screw effect hole
7
thread
M4
4. 5
0.5
0. 25
M36
39
3.0
1.5
MS
5 . 5
0.5
0. 25
M42
45
3. 0
1.5
M6|| tt||6. 6
0. 6
0. 3
M48
52
4.0
2. 0|| tt | . 5
M56
62
6.0
3.0
M10
11
1.0
0 . 5
M64
70
6.0
3.0
M12
13.5
1.5
0.75
M72
78
6.0
3.0
The processed thread surface is not allowed to have defects such as black skin, bumps, random buckles and burrs. 7.1
M16
17.5
1. 5
0.75
M80
86
6. 0
3. 0
7.2 Normal Thread ending, shoulder distance, tool retraction and angle dimensions shall be in accordance with the provisions of GB/T3. 7.3 Ordinary thread accuracy is based on 6H/6g specified in GB197, >30
~50
0. 06
M20
22
2.0|| tt||1.0
M90
96
6. 0
3. 0
>50
~120||tt| |0. 08
M24
26
2.0
1. 0
M100
107
7. 0
3.5
mm
>120
～250
0.10
mm
M30
33
3.0
1.5
For example, the internal and external threads must be chamfered before processing the threads. The external thread is 45*, the internal thread is 60°, and the chamfering depth is equal to the bolt. depth. 7.4
8 Center hole
8.1 The center hole needs to be retained or removed, which should be indicated on the drawing. If not indicated, it can be regarded as the center hole being retained or removed. 8.2 The type and size of the center hole shall be in accordance with corresponding standards. 8.3 The surface roughness of the central hole taper surface: R used for rough machining, the value is not greater than 6.3μm, R used for finishing, the value is not greater than 3.2um. For precision parts, R, the value is not greater than 1.6μm. 9 Surface roughness is not noted
9.1 The R. value of threaded through holes, long holes and holes processed by twist drills or pointed drills shall not be greater than 25am. 9.2 The R. value of undercut grooves, lubrication grooves, threads, thread undercut fines, balance keys and flat keyways shall not be greater than 3.2um. 9.3 The internal chamfer (chamfer) is the same as the fine surface it is connected to. The external chamfer (chamfer) is the same as the rough surface it is connected to. 5 | | tt | The plane is allowed to be processed according to the shape of the existing tool, but the location where it meets the functional surface needs to be marked to determine the range of dimensions that are allowed to be changed. 6
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