GB/T 9204.3-1988 Technical conditions for fixed top

GB/T 9204.3-1988 Technical conditions for fixed top GB/T9204.3-1988 standard download decompression password: www.bzxz.net

National Standard of the People's Republic of China
Fixed center
Technical conditions
Dead centre-Specification
1 Subject content and applicable specificationsWww.bzxZ.net
This standard specifies the technical requirements, inspection rules and product marking and packaging of fixed centers. This standard applies to all types of fixed centers with metric cones and with Chiskin cone tail shanks. 2 Reference standards
JB/Z189 Compilation of technical documents for machine tool accessories JB3207 General technical conditions for packaging of machine tool accessories JB 2326 Method for compiling machine tool accessories models
JB2554 Technical conditions for rust prevention of machine tools
3 Technical requirements
3.1 Materials
UDC 621.9.08
GB 9204.3—88
3.1.1 The tip body of the hard alloy tip is made of 45 carbon cable structural steel or materials with better performance than it, and the tip body of other tips is made of T8 carbon tool steel or materials with better performance than it. 3.1.2 The pressed nut is made of 35 or 45 carbon structural steel 3.1.3 The hard alloy head is made of hard alloy materials of grades YG8, YT15, etc. 3.2 Heat treatment
3.2.1 The quenching hardness of the carbide tip cone shank is HRC40~45, the quenching hardness of the other 60° cone surface is HRC58~62, and the cone shank quenching hardness is not less than HRC40. 3.2.2 The hardness of the pressed nut is HRC35~40, and it is bluing or other surface treatments are performed. 3.3 The surface roughness and the contact accuracy of the tail shank cone surface and the standard gauge are shown in the table below. The contact of the tail shank cone surface should be uniform over the working length. Accuracy level
High precision level (G)
Precision level (M)
Ordinary level
Roughness R. value (≤) μm
60°conical surface
Tail conical surface
Conical surface contact as a percentage of the working
length (%)
3.4The combination of the carbide head and the neck tip must be firm and reliable. When welding, the weld should be uniform, and the surface of the welding chain should not have defects such as pores and slag that affect use.
3.5The surface of the top should not have defects such as cracks, scars, burns and rust that affect use and appearance. Approved by the State Machinery Industry Commission on May 12, 1988, 19B9-01-01 for implementation
4 Inspection period
4.1 Hardness inspection location
GB9204.3—88
The hardness inspection of the 60° cone surface should be conducted at the front end of the top neck. 4.2 Except for the specific provisions of this standard, the inspection of the contact accuracy of the cone surface of the tail handle should comply with the provisions of the relevant machine tool cone coloring method inspection.
5 Marking and packaging
5. Clearly mark the following at the appropriate position of the top (as shown in the figure
Manufacturer name or trademark;
b. Product model.
Marking example (excluding manufacturer name and trademark): Ordinary British No. 5 alloy-inlaid top
Precision Mohs No. 4 half-missing top
High-precision Mohs No. 3 ordinary top
DM 134
DG 113
Precision Mohs No. 6 with pressed nut pre-tip
High-precision metric No. 6 ordinary top
5.2 The product's anti-rusting shall comply with the provisions of JB2554. 5.3 The packaging shall comply with the provisions of JB3207.
DG 116 M
5.4 The product shall be accompanied by a certificate of conformity and other technical documents, the writing method of which shall comply with the provisions of JB/Z189. Additional remarks:
This standard is proposed by the National Technical Committee for Standardization of Metal Cutting Machine Tools. This standard is under the jurisdiction of the National Technical Committee for Standardization of Metal Cutting Machine Tools. This standard is drafted by the Yantai Machine Tool Accessories Research Institute. From the date of implementation of this standard, the original JB2894-81 fixed item technical conditions shall be invalidated.
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