JB/T 5000.2-1998 JB/T 5000.2-1998 General technical conditions for heavy machinery flame cutting parts JB/T5000.2-1998 Standard download and decompression password: www.bzxz.net

ICS21.010
J33
JB
Machinery Industry Standard of the People's Republic of China
JB/T5000.21998
General Technical Conditions for Heavy Machinery||tt| |Flame cutting parts
The heavy mechanical general techniques and standardsFire-cutting
Released on 1998-09-30
National Machinery Industry Bureau
Released
1998 -12-01 Implementation
JB/T5000.2-1998
Previous
Appendix A and Appendix B of this standard are both reminder appendices. Words
This standard is proposed and managed by the Metallurgical Equipment Standardization Technical Committee of the Ministry of Machinery and Industry. The unit responsible for drafting this standard is Dazhong Group Company. The unit that participated in the drafting of this standard is Xi'an Heavy Machinery Research Institute. The main drafter of this standard: Sang Yongquan.
1Scope
Mechanical Industry Standards of the People's Republic of China
General Technical Conditions for Heavy Machinery
Flame Cutting Parts
The heavy mechanical general techniques and standards Fire-cutting
This standard specifies the surface quality requirements, dimensional deviation, groove accuracy and detection methods of flame-cut parts JB/T 5000.2-1998
This standard is applicable to heavy machinery products, for carbon steel, Flame cutting parts of low alloy steel, titanium and titanium alloy plates. All product drawings, designs and process documents without special requirements shall comply with the provisions of this standard. 2 Reference standards
The provisions contained in the following standards constitute provisions of this standard through citation in this standard. When this standard is published, the versions indicated are valid. All standards are subject to revision and parties using this standard should explore the possibility of using new versions of the standards listed below. GB 70988 | | tt | | GB/T362194 | definition.
3.1 Verticality and slope tolerance
The verticality and slope tolerance refer to the highest and lowest points of the cutting surface contour under the theoretical correct angle conditions (90\or with the workpiece datum plane) The distance between two parallel straight lines of a point. The straightness and slope tolerances are represented by (see Figure 1 and Figure 2). Figure 1 Straightness tolerance
3.2 Surface roughness (hereinafter referred to as roughness R,) Figure 2 Slope tolerance
refers to the measurement on 5 parallel sampling lengths within the evaluation length The average of the five largest wheel fan peak heights and the five largest wheel fan valley depths approved by the National Machinery Industry Bureau on 1998-09-30 and implemented on 1998-12-01
1
sum (see Figure 3). 3.3 Grooving accuracy
JB/T 5000.2—1998
In
+
1 to sampling length (take 2,=15mm)
1— Evaluation length (take = 5 = 75mm)
, - probe stroke (take 4, = 105mm)
Figure 3
Groove accuracy P refers to the tolerance of the groove angle 9 Tolerance with groove depth H (see Figure 4), 1 shape
④?
3.4 ??length dimension
V-shaped edge
④?||tt| |?
V彩
Figure 4
The length dimension refers to the inner size, outer size, step size, diameter, rounding radius and chamfer, etc. 4 Flame cutting surface quality index
4.1 The verticality tolerance value and the slope tolerance value should not be greater than those specified in Table 1. Table 1
Cutting thickness
8
Level 1
Level 2
2
Tolerance value
>5
~10
0. 5
1.2
>10
~20
0. 6
1.3| |tt||>20
40
0.8
1.6
>40
~60
1.0
1 . 9
>60
~80
1.2
2.2
>80
~100
1.4|| tt | >100
~130
1.7
2.95
>130
~160
2. 0
3.4| |tt||Welcome
V-shaped
?
?
>160
~200
2. 4||tt| |4. 0
>200
~256
2.9
4. 75
C
④
mm
>250
~300
3.4
5.5
4.2
The rough orange degree R shall comply with the provisions of Table 2.
Cutting thickness 2
mm
1 bag
Level 2
4.3
Level
Speciality||tt| |B
44
level
different
2
coarse
degree
R.
>6
~25
100
160
>25
~50
100
200||tt ||JB/T5000.2—1998
Table 2
>50
~100
200
250
Length size deviation Values ??should comply with Table 3. Nominal size
Aspect ratio
4:1
>4: 1
L
~315
>315~1000| |tt||>1000~2000
>2000~4000
315
>315~1000
>1000~2000
>2000~4000
6~50
±0. 5
±1. 0
±1. 5
±2. 0
± 1. 5
±2.5
±3. 0
±3.5
Table 3
>50
~100||tt ||±1. 0
±2. 0
±2.5
±3. 0
±2. 5
±3.5||tt ||±4. 0
±4. 5
>100
~150
240
300
>150|| tt||~200
280
400
cut thick leather 8
>100
~150
±2. 0
±2.5
±3. 0
±4. 0
±4.0
±5. 0
±6. 0
±3. 0
>150
～200
±2. 5
>200
～250||tt| |350
500
>200
~250
±3. 0
±3.5
±4. 5||tt ||±4.5
± 6.5
±7. 0
μm
>250
~300
420
600
mm
>250
~300
±4.0
±5.0
±6. 0
±5.0
±7. 0
±8. D
The unevenness of the hot-rolled plate used shall comply with the requirements of 5.1 and 5.1.1 of GB709-88. When the plate thickness is greater than 200mm, the unevenness of 200mm specification is still used. The unevenness of titanium and titanium alloy plates used should be equal to the provisions of 1.2.2 in GB/T3621-94. When the aspect ratio of the workpiece is greater than 4:1, when the A-level dimensional deviation is selected, it should be indicated on the drawing or process, otherwise it will be regarded as B-level. The minimum diameter of the flame cutting machine is shown in Table A2 in Appendix A (Suggested Appendix). The dimensional deviation of the nominal size greater than 4000mm should be specially specified and marked on the drawing. The limit deviation value of the groove accuracy should comply with the provisions of Table 4. Table 4
Angle of opening 8
(*)
Root surface
46
±1. 5
±5
Bevel angle
6
±2. 5
±5
4
±0.5
±1. 0
Depth of opening H
mm
Height of root 3-H
>4
4H
±1. 0
±2. 0
3
5Testing method
JB/T 5000.2—1998
5.1 The testing (rough testing) at the production site shall comply with the requirements of Table 5. Table 5 Item Straightness and slope Roughness R Length dimension L Mouth accuracy p Detection error o.imm 0.5mm 0.1mm Comparison Inspection Industry Alignment and straightening of ends Measurement Workpiece Depth and height measurement Angle measurement Method Ruler Ruler 5.2 The measurement range of the tolerance of verticality and slope on the cutting thickness is in accordance with the provisions of Figure 5 and Table 6, bending ruler (accuracy level 1 or 2), measuring wire, feeler gauge, cutting surface quality sample, steel ruler, steel tape measure (level 1 or 2), steel ruler, depth caliper, weld detector (can only detect workpiece thickness 3≤45mm specification), weld detector, angle gauge, special sample, cutting thickness 8 a 5.3>5~60. 3
>6
～10
0. 6
>10
~20
1. 0
JB/T5000.2—1998
Test examples of verticality tolerance and skew tolerance Figure 5
Table 6
>20
~40
1. 5
The test (precision measurement) of the metrology room shall comply with the provisions of Table 7. Table 7
Item
Verticality, slope
Roughness
R.
Detection error
0.02mm
0.002mm
Detection
Test
>40
~100
2.0
>100
~150
3.0
Mount the guide device on the steel plate (its guide is perpendicular to the plate surface). Slide the dry table along the guide to detect the cutting direction continuously
5.4 Provisions for the inspection position and number of inspection positions for cutting surface quality 5.4.1 Conditions for determining the inspection position:
a) The selected inspection position should not have cutting notches:>150
~200
5. 0
>200
～250
8.0
Precision measuring tools
>250
～300
10.0
Guide decoration, dry meter probe angle ≤90°, probe radius ≤0.1mm
Electrical test only, optical tester
Note: Cutting notch refers to the deep groove defect with irregular width, depth and shape formed on the cutting surface, which interrupts the uniform cutting pattern. b) The detection parts at both ends of the cutting length should be selected at a distance of more than one cutting thickness from the end of the workpiece; c) The measurement reference surface (upper and lower surfaces of the workpiece) of the measuring part must be flat and clean: d) Roughness R, the measurement line should be selected in the cutting thickness direction, two-thirds away from the workpiece reference surface. 5.4.2 The number of measuring parts is specified in Table 8. Cutting surface quality
Item
Verticality, slope
Coarse grain
R
Groove accuracy
Level
1
2
2
1
2
500
e
1
1
2
2
Quality grade and marking method of cutting surface
The provisions of various cutting surface quality grades are shown in Table 9. 6.1
Item
Item
Verticality, slope.
Roughness R.
Dimension deviation
Groove precision P
Note: The surface roughness of the interface is level 2,
Marking code
6.2
JB/T 5000.2—1998
Table 8
Length of cutting surface L
mm
>500~1000
Number of measuring
Measurement
Measurement
3
3
2
3
2
Table 9
(place)
Quality grade of cut parts
.
1
A
1
@-
Of which: ①-specified quality grade; ②-a standard number. If all or most of the cutting surfaces of a workpiece require the same quality level, then the "6.3
>1000
5
3
5
6
0-2)
I
2
2
B
2
Measure the length of the cutting surface
Parts
Uniformly distributed along the length
direction" will be marked on the drawing (or process
\The arrow points to the cutting surface, and ② can be omitted. Figure) has an upper corner: If a cutting surface has different quality grade requirements, then the "The surface that is cut with fire plugging instead of rough cutting must be marked\-R.×—\, with the arrow pointing to the surface. 6.4
Quality grade 1 must be marked, otherwise it will be regarded as level 1. 6.5
When the groove surface needs to be marked separately. "
6.6
e.7
6
Drawing marking example
x
_\The arrow points to the groove surface.
JB/T 5000.2~1998
a) The quality grade markings in accordance with 6.1 and 6.2 are shown in Figure 6. R.100-1
480
Figure 6
The two holes originally required to be cut R, 25 are replaced by flame cutting R, 100-1 quality grade, and the quality grade of the remaining exposed free surfaces is I grade. However, the end groove accuracy is I grade.
b) The markings of the agreed grades
w1.3-R, 400-B
/JB/T5000.21998
Where: verticality u≤1.3mm; roughness Rz400μm; workpiece size deviation is B grade.0
μm
>250
~300
420
600
mm
>250||tt| |~300
±4.0
±5.0
±6. 0
±5.0
±7. 0
±8. The unevenness of the hot-rolled plates used by D
conforms to the provisions of 5.1 and 5.1.1 in GB709-88. When the thickness of the plate is greater than 200mm, the unevenness of 200mm is still used.
The unevenness of the titanium and titanium alloy plates used should comply with the provisions of 1.2.2 in GB/T3621-94. When the aspect ratio of the workpiece is greater than 4 : 1. When selecting Class A dimensional deviation, it should be indicated on the drawing or process, otherwise it will be regarded as Class B. The minimum circumferential diameter cut by the Huoshi cutting machine is shown in Table A2 in Appendix A (Appendix of Tips). Dimensional deviations where the nominal size is greater than 4000mm should be separately specified and marked on the drawing. The groove accuracy limit deviation value should comply with the provisions of Table 4. Table 4
Press mouth angle 8
(*)
Root surface
46
±1. 5
±5|| tt||Bevel angle
6
±2. 5
±5
4
±0.5
±1. 0| |tt||Hip depth H
mm
Root height 3-H
>4
4H
±1. 0||tt ||±2. 0
3
5 Testing method
JB/T 5000.2—1998
5.1 The inspection (rough inspection) at the production site should comply with Table 5 Regulation. Table 5
item
straightness
and slope
roughness
R
length size
L
Quiet accuracy
p
Detection error
o.imm
0.5mm
0.1mm
Comparison
Inspection
Industrial
End alignment and straightening
Measurement
Workpiece
Depth and height dimension measurement
Angle Measurement
square
method
foot
foot
5.2 Tolerance of verticality and slope Measurement range in cutting thickness Figure 5 and According to the requirements of Table 6, bent ruler (accuracy level 1 or level 2
), measuring wire, feeler gauge
cutting surface quality sample
steel ruler, steel tape measure
(Level 1 or 2)
Steel ruler. Depth caliper,
Welding joint detector (can only detect
workpiece thickness 3≤45mm gauge
grid)| |tt||Welding joint detector, angle
Gage, special template
Cutting thickness
8
a
5.3
> 5
～6
0. 3
>6
～10
0. 6
>10
~20
1. 0
JB/T5000.2—1998
Testing diagram for verticality tolerance and slant construction tolerance Figure 5
Table 6|| tt||>20
~40
1. 5
The testing (precision measurement) of the measuring room should comply with the provisions of Table 7. Table 7
item
verticality, slope
roughness
R.
detection error
0.02mm||tt ||0.002mm
Inspection
Test
>40
~100
2.0
>100
~150
3.0
Install the guide device on the steel plate (the guide is perpendicular to the plate surface). Slide the dry meter along the guide to detect the cutting direction and continuously test
5.4 Cutting surface quality inspection Regulations on the number of parts and testing parts 5.4.1 Conditions for determining the testing parts:
a) The selected testing parts should not have cutting gaps: >150
~200
5. 0
>200
～250
8.0
Precision measuring tools
>250
～300
10.0|| tt||Guide installation, dry gauge probe angle ≤90°, probe radius ruler ≤0.1mm
Electrical test only, optical tester
Note: Notching refers to cutting Deep groove defects with irregular width, depth and shape formed on the surface, which interrupt the uniform cutting pattern. b) The detection locations at both ends of the cutting length should be selected at least one cutting thickness away from the end of the workpiece; c) The measurement locations The measurement datum surface (the upper and lower surfaces of the workpiece) must be flat and clean: d) Thickness R. The measurement line should be selected in the cutting thickness direction, two-thirds of the way from the workpiece datum surface. 5.4.2 The number of measurement parts is specified in Table 8. Cutting surface quality
item
verticality, slope
coarse graininess
R
bevel accuracy
level||tt| |1
2
2
1
2
500
e
1
1
2
2
Quality grade and labeling method of cutting surface
The quality grade regulations of various cutting surfaces are shown in Table 9. 6.1
item|| tt||Mesh
Verticality, slope.
Roughness R.
Dimensional deviation
Bevel accuracy P
Note: The interface surface roughness is all level 2,
Marking code| |tt||6.2
JB/T 5000.2—1998
Table 8
Cutting surface length L
mm
>500~1000||tt ||Measurement
Number of parts
Quantity
Quantity
3
3
2
3||tt| |2
Table 9
(place)
Quality grade of cut parts
.
1
A
1
@-
Among them: ①-the specified quality level; ②-the standard number. If all or most of the cutting surfaces of a workpiece require the same quality and equal gradient, then 6.3
>1000
5
3
5
6
0-2)
I
2
2
B
2
along the cutting surface|| tt||length measurement
part
bit
evenly distributed along the length
direction
" mark on the pattern (or process
\ The arrow points to the cutting surface, where ② can be omitted. Figure) has an upper corner: If a certain cutting surface has different quality level requirements, the surface that will be cut with fire instead of rough cutting must be marked \-R.×— \,The arrow points to this surface. 6.4
Quality level 1 must be marked, otherwise it will be regarded as level 1. 6.5
When the groove surface needs to be marked separately. "
6.6
e.7
6
Example of pattern marking
x
_\The arrow points to the groove surface.
JB/T 5000.2~1998
a) See Figure 6 for the quality grade markings specified in 6.1 and 6.2. | tt | However, the end bevel accuracy is Class I.
b) Agreed level marking
w1.3-R,400-B
/JB/T5000.21998||tt| |Among them: verticality u≤1.3mm; roughness Rz400μm; workpiece size deviation is level B.0
μm
>250
~300
420
600
mm
>250||tt| |~300
±4.0
±5.0
±6. 0
±5.0
±7. 0
±8. The unevenness of the hot-rolled plates used by D
conforms to the provisions of 5.1 and 5.1.1 in GB709-88. When the thickness of the plate is greater than 200mm, the unevenness of 200mm is still used.
The unevenness of the titanium and titanium alloy plates used should comply with the provisions of 1.2.2 in GB/T3621-94. When the aspect ratio of the workpiece is greater than 4 : 1. When selecting Class A dimensional deviation, it should be indicated on the drawing or process, otherwise it will be regarded as Class B. The minimum circumferential diameter cut by the Huoshi cutting machine is shown in Table A2 in Appendix A (Appendix of Tips). Dimensional deviations where the nominal size is greater than 4000mm should be separately specified and marked on the drawing. The groove accuracy limit deviation value should comply with the provisions of Table 4. Table 4
Press mouth angle 8
(*)
Root surface
46
±1. 5
±5|| tt||Bevel angle
6wwW.bzxz.Net
±2. 5
±5
4
±0.5
±1. 0| |tt||Hip depth H
mm
Root height 3-H
>4
4H
±1. 0||tt ||±2. 0
3
5 Testing method
JB/T 5000.2—1998
5.1 The inspection (rough inspection) at the production site should comply with Table 5 Regulation. Table 5
item
straightness
and slope
roughness
R
length size
L
Quiet accuracy
p
Detection error
o.imm
0.5mm
0.1mm
Comparison
Inspection
Industrial
End alignment and straightening
Measurement
Workpiece
Depth and height dimension measurement
Angle Measurement
square
method
foot
foot
5.2 Tolerance of verticality and slope Measurement range in cutting thickness Figure 5 and According to the requirements of Table 6, bent ruler (accuracy level 1 or level 2
), measuring wire, feeler gauge
cutting surface quality sample
steel ruler, steel tape measure
(Level 1 or 2)
Steel ruler. Depth caliper,
Welding joint detector (can only detect
workpiece thickness 3≤45mm gauge
grid)| |tt||Welding joint detector, angle
Gage, special template
Cutting thickness
8
a
5.3
> 5
～6
0. 3
>6
～10
0. 6
>10
~20
1. 0
JB/T5000.2—1998
Testing diagram for verticality tolerance and slant construction tolerance Figure 5
Table 6|| tt||>20
~40
1. 5
The testing (precision measurement) of the measuring room should comply with the provisions of Table 7. Table 7
item
verticality, slope
roughness
R.
detection error
0.02mm||tt ||0.002mm
Inspection
Test
>40
~100
2.0
>100
~150
3.0
Install the guide device on the steel plate (the guide is perpendicular to the plate surface). Slide the dry meter along the guide to detect the cutting direction and continuously test
5.4 Cutting surface quality inspection Regulations on the number of parts and testing parts 5.4.1 Conditions for determining the testing parts:
a) The selected testing parts should not have cutting gaps: >150
~200
5. 0
>200
～250
8.0
Precision measuring tools
>250
～300
10.0|| tt||Guide installation, dry gauge probe angle ≤90°, probe radius ruler ≤0.1mm
Electrical test only, optical tester
Note: Notching refers to cutting Deep groove defects with irregular width, depth and shape formed on the surface, which interrupt the uniform cutting pattern. b) The detection locations at both ends of the cutting length should be selected at least one cutting thickness away from the end of the workpiece; c) The measurement locations The measurement datum surface (upper and lower surfaces of the workpiece) must be flat and clean: d) Roughness R. The measurement line should be selected in the cutting thickness direction, two-thirds of the way from the workpiece datum surface. 5.4.2 The number of measurement parts is specified in Table 8. Cutting surface quality
item
verticality, slope
coarse graininess
R
bevel accuracy
level||tt| |1
2
2
1
2
500
e
1
1
2
2
Quality grade and labeling method of cutting surface
The quality grade regulations of various cutting surfaces are shown in Table 9. 6.1
item|| tt||Mesh
Verticality, slope.
Roughness R.
Dimensional deviation
Bevel accuracy P
Note: The interface surface roughness is all level 2,
Marking code| |tt||6.2
JB/T 5000.2—1998
Table 8
Cutting surface length L
mm
>500~1000||tt ||Measurement
Number of parts
Quantity
Quantity
3
3
2
3||tt| |2
Table 9
(place)
Quality grade of cut parts
.
1
A
1
@-
Among them: ①-the specified quality level; ②-the standard number. If all or most of the cutting surfaces of a workpiece require the same quality and equal gradient, then 6.3
>1000
5
3
5
6
0-2)
I
2
2
B
2
along the cutting surface|| tt||length measurement
part
bit
evenly distributed along the length
direction
" mark on the pattern (or process
\ The arrow points to the cutting surface, where ② can be omitted. Figure) has an upper corner: If a certain cutting surface has different quality level requirements, the surface that will be cut with fire instead of rough cutting must be marked \-R.×— \,The arrow points to this surface. 6.4
Quality level 1 must be marked, otherwise it will be regarded as level 1. 6.5
When the groove surface needs to be marked separately. "
6.6
e.7
6
Example of pattern marking
x
_\The arrow points to the groove surface.
JB/T 5000.2~1998
a) See Figure 6 for the quality grade markings specified in 6.1 and 6.2. | tt | However, the end bevel accuracy is Class I.
b) Agreed level marking
w1.3-R,400-B
/JB/T5000.21998||tt| |Among them: verticality u≤1.3mm; roughness Rz400μm; workpiece size deviation is level B.3mm; roughness Rz400μm; workpiece size deviation is level B.
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