JB/T 7164-1993 Rock drilling machinery and pneumatic tool machining JB/T7164-1993 standard download decompression password: www.bzxz.net

Mechanical Industry Standard of the People's Republic of China
JB/T7164-93
Rock Drilling Machinery and Pneumatic Tools
General Technical Conditions for Machined Parts
Published on November 21, 1993
Ministry of Machinery Industry of the People's Republic of China
Implemented on March 1, 1994
Mechanical Industry Standard of the People's Republic of China
Rock Drilling Machinery and Pneumatic Tools
General Technical Conditions for Machined Parts
Subject Content and Scope of Application
JB/T 716493
This standard specifies the general provisions, un-toleranced dimensions, shape and position oxygen tolerance, and coating thickness measurement methods for machined parts of rock drilling machinery and pneumatic tools.
This standard applies to machined parts of rock drilling machinery and pneumatic tools. Where there are no special requirements in product drawings or technical documents, they shall comply with the provisions of this standard. 2 Reference standards
Tolerance and fit General standard tolerance and basic deviation GB1800
3 General provisions
Free angle tolerance
3.1 The machined surface of the parts shall not have defects such as scale, rust, scratches, bumps, etc. that damage the surface of the parts and affect the appearance. 3.2 The sharp edges and corners of the parts shall be processed into chamfers less than or equal to 0.2×45° or fillets with R less than or equal to 0.2mm when no requirements are indicated on the drawings. Burrs shall be removed.
3.3 Inspection marks shall be made according to the designated parts of the process. 3.4 The ground surface of the parts shall not be allowed to have burns or cracks. 4 Dimensions without tolerances
4.1 The dimensions without tolerances of holes and equivalent holes shall be manufactured according to the IT14: grade precision in GB1800, and the tolerance values ​​shall be "+", see Table 1. 4.2 The dimensions without tolerances of shafts and equivalent shafts shall be manufactured according to the IT14 grade precision in GB1800, and the tolerance values ​​shall be ", see Table 1. Table 1
Basic size
(+) or (—)
Basic size
(+) or (-
White 1~3
>10~18
>120~180>180~250>250~315
>315~400
>18~30
>400~500
>30~~50
>500~630
>50~80
>630~8 00
>80~120
>800~1000
4.3 The dimensions without tolerances for non-matching lengths shall be manufactured according to the IT14 level precision in GB1800, and the tolerance value shall be 1/2 of IT14. The “Sir” number shall be shown in Table 2.
Basic dimensions
Basic dimensions
From 1~3
>80~120
>120~180
Approved by the Ministry of Machinery Industry on November 21, 1993
>180~250||tt| |>10~18
>250~315
>18~30
>315~400
>30~50
>400~500
>50~80
>500~630
1994-03-01 implementation
Basic dimensions
JB/T716493
Continued Table 2
The unnoted tolerance dimensions of grooves and slots shall comply with the provisions of Articles 4.4.1 and 4.4.2. 4.4 .1
～2500
～3150
Tolerance of groove and slot width, manufactured according to IT15 level precision in GB1800, tolerance value is 1/2 of IT15, prefixed with "±\", see Table 3. Table 3
Basic size
From 1~3
>10~18
>18~30
>30~50
Tolerance of groove and slot diameter, manufactured according to IT15 level precision in GB1800, inner hole tolerance value prefixed with "+\", outer diameter tolerance value prefixed with 4. 4. 2
“_\”, see Table 4.
Basic dimensions
Drilling depth without tolerance shall comply with the provisions of Table 5, Table 5
Basic dimensions
From 130
>30~100
>100200
Free dimension tolerance, manufactured according to Class 2 accuracy in JB7, see Figure 1 and Table.6. Free angle tolerance·Manufactured according to Class 3 accuracy in JB7, 4.6
See Figure 2 and Table 7,
Basic dimension L
Tolerance (±)
Corresponding vertical line tolerance.
Basic dimension L
Tolerance (±)
Corresponding linear tolerance.
Basic dimension L
Tolerance (±)
Corresponding linear tolerance.
Basic dimension L
Tolerance (±)a
Corresponding linear tolerance.
0. 21~0. 41
>80~120
1.40~2.09
0.31~0.63
>80~120
2. 34~3. 49
JB/F:7164-93
>10~18
0.32~0.52
>120~180
1.75~2.61
0.58~0.88
>120~180bzxz.net
2.80~4.19
Note①Dimension tolerance is determined by the length of the dimension body generatrix. ?Angle tolerance is determined by the length of the short side of the angle. 0.44~0.78
>180~260
2.10~3.02
>10~18
0.70~1.26
>180~260
3.15~4.55
③When the machined part is an inclined hole, it is manufactured according to the second level accuracy of JB7, see Table 6. ①The tolerance is symmetrically distributed about the zero line.
>18~30
0.63~1.04
>260~360
2. 27~3.14
>18~30
0.91~1.57
>260~360
3.80~5.26
The dimensions of non-matching fillets and corners of machined parts without tolerances shall comply with the provisions of Table 8. 4. 7
5Unspecified shape and position tolerances
AR or AC
>30~50
0.88~1. 45
>360~500
2. 51~3. 49
>30~50
1.31~2.19
>360~500
4.18~5.80
>50~80
1.17~1.86
>500~630
2.91~3.66
> 50~80
1.75~2.79
>500~630
5.1 Shaft and hole scheduling, cylindricity, etc. Shape tolerance, parts with dimensional accuracy below IT9 should be within their dimensional tolerance range; parts with dimensional accuracy above IT8 should be within 65% of their dimensional tolerance range; shafts and holes with interference fit are not allowed to have reverse tapers, and the roundness of thin-walled sleeve parts should comply with process regulations to ensure the dimensional tolerance after assembly (the tolerance within 3 plus m of the edge of the inner hole is allowed to exceed 50% of the part dimensional tolerance). 5.2 The inclination of the center line of the two cross holes is manufactured according to the dimensional tolerance of the large hole diameter IT15. 5.3 The symmetry of the measured surface of symmetrical parts shall not exceed 1/2 of its own tolerance. 5.4 The parallelism of the measured surface of the part to the reference plane is allowed to be within the measured dimensional tolerance range. 5.5 If the product drawing requires color inspection, use red lead oil for color inspection. 5.5.1 The coating thickness of red lead oil shall not exceed 4μm (see Chapter 7 for its inspection method). 5.5.2 Color inspection of matching taper.The coloring area shall not be less than 75% of the mating area, and the large end must be colored and evenly distributed. 5.5.3 For the plane that requires coloring, the coloring area shall not be less than 75% of the inspected area and evenly distributed. However, it must be colored around the vents and sealed parts to avoid leakage.
6 Threaded part
JB/T-7164-93
6.1 For coarse and fine pitch ordinary threads, the surface roughness parameter R is 6.3μm. 6.2 Trapezoidal threads, cylindrical and conical pipe threads are manufactured according to the lowest level of accuracy of the thread standards to which they belong, and the surface roughness parameter R. is 6.3 μm.
6.3 The working surface of the thread is not allowed to have cracks, flattening, scratches that affect use, burrs, and unevenness. 7 Simple measurement method of coating thickness (recommended) 7.1 Place the coloring gauge and the dry pad of fixed size on the micrometer and read the value directly. Then remove the dry pad, apply red lead oil on the coloring gauge, and then put the original pad on and read the value. The difference is the thickness of the coloring layer. 72 If the negative tool cannot directly measure the plate, a special net column gauge (partially modified from a smooth plug gauge) is used. The working part of the smooth plug gauge, that is, the middle section of the column, is ground with a concave depth of 4um. The protruding parts at both ends are used as the supporting surface. When measuring, according to the width of the groove and the supporting surface at both ends, the red lead oil paint on the surface of the measured part that contacts the supporting surface is wiped clean with gasoline, and then the gauge is close to the surface of the measured part and slowly moved. If the concave surface of the gauge is not stained with red lead oil paint, the measured red lead oil paint thickness is less than 4μm. Additional remarks:
This standard is proposed and managed by Tianshui Liuyan Mechanical and Pneumatic Tool Research Institute of the Ministry of Machinery Industry. This standard was drafted by Shenyang Pneumatic Tool Factory. The main drafter of this standard is Qu Xiwang.
From the date of implementation of this standard, JB/SQ16-87 General Technical Conditions for Mechanical Processing Parts of Rock Drilling Machinery and Pneumatic Tools will be invalidated.
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