JB/T 8046.2-1999 Bushings for boring bushes of machine tool fixture parts and components

JB/T 8046.2-1999 This standard is a revision of JB/T 8046.2-95 "Bushings for boring sleeves of machine tool fixture parts and components". During the revision, only editorial changes were made according to relevant regulations, and the technical content remained unchanged. This standard specifies bushings for boring sleeves with specifications of 25 to 185 mm. This standard was first issued in 1981 as GB 2267-80, first revised to GB/T 2267-91 on April 30, 1991, and adjusted to JB/T 8046.2-95 in April 1996. JB/T 8046.2-1999 Bushings for boring sleeves of machine tool fixture parts and components JB/T8046.2-1999 Standard download decompression password: www.bzxz.net

tCS 25. 080. 01
Mechanical Industry Standard of the People's Republic of China
Parts and units of jigs and fixturesBush for boring holder
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Published on 1999-08-06
State Bureau of Machinery Industry
Implementation on 2000-01-01
Mechanical Industry Standard of the People's Republic of China
Parts and units of jigs and fixturesBush for boring holder
The parts and units of jigs and fixturesBush for boring holder
This standard specifies bushings for boring sleeves with specifications of 25~185mm. 2 Reference standards
JB/T 8046.2-1999
Replaces JB/T 8046.2-1995
The provisions contained in the following standards constitute the provisions of this standard through reference in this standard. When this standard is published, the versions shown are valid. All standards will be revised, and parties using this standard should explore the possibility of using the latest versions of the following standards. GB/T 699—1988
Technical conditions for high-quality carbon structural steel
JB/T8044—1999.:
Technical requirements for machine tool fixture parts and components
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The dimensions are shown in the following figure and table.
Approved by the State Bureau of Machinery Industry on August 6, 1999, and implemented on January 1, 2000
Basic size
Limit deviation H6
Limit deviation H7
Basic size
Limit deviation n6
JB/T.8046.2—1999
354045
5560165
5215816570175
Note: Since H6 or H7 is the tolerance zone after assembly, the processing size of the parts needs to be determined by the process. 4 Technical conditionswwW.bzxz.Net
4.1 Material: 20 steel according to the provisions of GB/T699. 4.2 Heat treatment: Carburizing depth is 0.8~1.2mm, 58~64HRC. 45
851001110120
125135160
85100115
4.3d tolerance @anpD two tolerances pFtoX5Dtop5:Test0.0104.4 Other technical conditions shall be in accordance with the provisions of JB/T8044 5 Marking
5.1 Marking example:
d=32mm,
tolerance zone is H6, H=25mm, boring sleeve bushing: village sleeve 32H6×25JB/T8046.2—1999272
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