JB/T 8045.4-1999 Bushings for machine tool fixture parts and components

JB/T 8045.4-1999 JB/T 8045.4-1999 Bushings for machine tool fixture parts and components Drill bushings JB/T8045.4-1999 Standard download decompression password: www.bzxz.net

ICS 25. 080. 01
Machinery Industry Standard of the People's Republic of China
The parts and units of jigs and fixtures
The parts and units of jigs and fixtures1999-08-06Promulgated
State Machinery Industry Bureau
Implementation on 2000-01-01
Machinery Industry Standard of the People's Republic of China
Parts and units of jigs and fixturesBush for bit holder
This standard specifies bushings for drill bushes with specifications of 8~105mm. 2 Reference standards
JB/T 8045.41999
Replaces JB/T8045.41995
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/T699—1988
GB/T 1298—1986
JB/T8044—1999
3 Dimensions
The dimensions are shown in the following figure and table.
Technical conditions for high-quality carbon cable structural steel
Technical conditions for carbon tool steel
Technical requirements for machine tool parts and components
Approved by the State Machinery Industry Bureau on August 6, 1999 264bzxz.net
Implemented on January 1, 2000
Basic dimensions
Limit deviation F7
Basic dimensions
JB/T8045.41999
Limit deviation n6
Note: Because F7 is the tolerance zone after assembly, the processing size of the parts needs to be determined by the process (when shrinkage needs to be reserved, 0.006-0.012mm is recommended). Technical conditions
4.1 Material: d≤26mmT10A shall comply with the provisions of GB/T1298. d>26mm20 steel shall comply with the provisions of GB/T699.
4.2 Heat treatment: T10A is 58~64HRC: 20 steel carburizing depth is 0.8~1.2mm, 58~64HRC. 4.3 Other technical conditions shall comply with the provisions of JB/T8044. 5 Marking
5.1 Marking example:
H-28mm A-type drill bushing:
d-18mm,
Bushing A18×28JB/T8045.4—1999
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