JB/T 7972-1999 This standard is a revision of JB/T 7972-95 "Carbide Helical Taper Shank End Mill". During the revision, the performance test chapter was deleted, and editorial modifications were made in accordance with relevant regulations. Other technical contents remained unchanged. This standard specifies the type and size, technical requirements and basic requirements for marking and packaging of carbide helical taper shank end mills (hereinafter referred to as milling cutters). This standard is applicable to carbide helical taper shank end mills with a diameter of 14~50mm. This standard was first issued in 1989 as GB 10951-89 and was adjusted to JB/T 7972-95 in April 1996. JB/T 7972-1999 Carbide Helical Taper Shank End Mill JB/T7972-1999 Standard Download Decompression Password: www.bzxz.net

ICS25.100.20
Machinery Industry Standard of the People's Republic of China
JB/T7972-1999
Carbide Helical Taper Shank End Mill
Published on 1999-05-20
National Bureau of Machinery Industry
Implemented on 2000-01-01
JB/T7972-1999
This standard is a revision of JB/T7972-95 "Carbide Helical Taper Shank End Mill". The performance test chapter was deleted during the revision, and editorial modifications were made in accordance with relevant regulations. Other technical contents have not changed. This standard replaces JB/T7972-95 from the date of implementation. This standard is proposed and managed by the National Technical Committee for Tool Standardization. The responsible drafting units of this standard are Harbin No. 1 Tool Factory and Chengdu Tool Research Institute. The main drafters of this standard are Zhou Yuewen, Tan Yali, Cai Guangqing, Li Qingyu, Chen Ketian, Zha Guobing and Nie Kexing. Scope
Mechanical Industry Standards of the People's Republic of China
Carbide Helical Taper Shank End Mills
JB/T 7972—1999
Replaces JB/T7972—95
This standard specifies the type and size, technical requirements and basic requirements for marking and packaging of carbide helical taper shank end mills (hereinafter referred to as end mills).
This standard is applicable to carbide helical taper shank end mills with a diameter of 14~50mm. 2 Referenced Standards
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 the parties using this standard should explore the possibility of using the latest versions of the following standards. GB/T1443-1996 Self-clamping cone for machine tool and tool handle GB/T2075-1998 Use of hard cutting materials for cutting Chip form Classification code for large group and use group GB/T5245-1987 Cemented carbide welding inserts 3 Types and dimensions
3.1 Types and dimensions of milling cutters
3.1.1 The types of milling cutters are in accordance with Figures 1 and 2.
Figure 1 Type A
Figure 2 Type B
Approved by the State Machinery Industry Bureau on May 20, 1999 AA rotary
Implementation on January 1, 2000
The dimensions of milling cutters are in accordance with Table 1.
Limit screening difference
(js14）
Limit deviation
(js16）
JB/T79721999
Mohs·
Network dimensionbzxz.net
I) The dimensions and limit deviations of the Mohs circle dimension shall be in accordance with the provisions of GB/T1443. 2) The carbide insert model shall be selected in accordance with GB/T5245. 3.2 Marking example
Carbide 1
Insert model
The diameter d-20mm is welded with P30 carbide inserts, and the A-type helical tooth taper shank end mill is marked as: Carbide helical tooth taper shank end mill A20P30JB/T7972—19994 Technical requirements
4.1 The milling cutter blade should be welded firmly without cracks, dents and edges. The surface of the sharp tool shall not have defects such as slag and rust that affect the performance.
4.2 The main surface roughness of the milling cutter shall be as follows: a) Front and back of the blade: R, 3.2μm; b) Outer surface of the tapered shank: R, 0.8μm.
4.3 The position tolerance of the milling cutter shall be as specified in Table 2. 2
The radial circle of the circumferential edge to the axis of the shank and the end face circle runout of the moving end edge to the axis of the shank
JB/T7972—1999
Adjacent teeth
4.4 The taper tolerance of the outer diameter of the working part of the milling cutter is 0.02mm. 0.032
18
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