JB/T 7971-1999 This standard is a revision of JB/T 7971-95 "Carbide Helical Tooth Straight 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 tooth straight shank end mills (hereinafter referred to as milling cutters). This standard is applicable to carbide helical tooth straight shank end mills with a diameter of 10~28mm. This standard was first issued in 1989 as GB 10950-89 and was adjusted to JB/T 7971-95 in April 1996. JB/T 7971-1999 Carbide Helical Tooth Straight Shank End Mill JB/T7971-1999 Standard Download Decompression Password: www.bzxz.net

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Machinery Industry Standard of the People's Republic of China
JB/T7971-1999
Carbide Helical Gear Straight Shank End Mill
Published on 1999-05-20
National Bureau of Machinery Industry
Implemented on 2000-01-01
JB/T7971-1999
This standard is a revision of JB/T7971-95 "Carbide Helical Gear Straight Shank End Mill". During the revision, the chapter on performance test was deleted and editorial changes were made in accordance with relevant regulations. Other technical contents have not changed. This standard replaces JB/T7971-95 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, Hong Xing. Scope
Mechanical Industry Standard of the People's Republic of China
Carbide Helical Gear Straight Shank End Mill
JB/T 7971-1999
Replaces IB/T7971-95
This standard specifies the type and size, technical requirements and basic requirements for marking and packaging of carbide helical gear straight shank end mills (hereinafter referred to as end mills).
This standard is applicable to carbide helical gear straight shank end mills with a diameter of 10~28mm. 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 version of the following standards. GB/T 2075-1998
GB/T5245---1987
GB/T6131.1—1996
3 Types and dimensions
3.1 Types and dimensions of milling cutters
Application of hard cutting materials for cutting Chip form Classification code for large group and application group Hard alloy welding inserts
Milling cutters with straight shanks Part 1: Types and dimensions of ordinary straight shanks 3.1.1 The types of milling cutters are as shown in Figures 1 and 2.
AA rotation
Figure 1 Type A
Figure 2 Type B
Approved by the State Bureau of Machinery Industry on May 20, 1999 and implemented on January 1, 2000
The dimensions of milling cutters are as specified in Table 1.
Limit Deviation
Limit Correction
JB/T 7971—1999
1) Shank size and limit deviation shall be selected in accordance with GB/T6131.1. 2) Carbide insert model shall be selected in accordance with GB/T5245. 3.2 Marking Example
Limit Deviation
Carbide
Jinwan Pian
The marking of A-type helical straight shank end mill with P30 carbide insert welded on the diameter d-20mm is: Carbide Helical Straight Shank End Mill A20P30JB/T7971—19994 Technical Requirements
4.1 The milling cutter blade shall be welded firmly and shall not have cracks, blunt edges or shear edges. The milling cutter surface shall not have defects such as scratches and rust that affect the performance.
4.2 The main surface roughness of the cutter shall be as follows: a) Front and back of the blade: R, 3.2μm; b) Outer surface of the handle: R. 0.8μm.
4.3 The position tolerance of the milling cutter shall be as specified in Table 2. Table 2
Radial runout of the broad edge to the axis of the rib
End runout of the spur to the axis of the tree
Adjacent teeth
Adjacent teeth
18
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