JB/T 7962-1999 This standard is a revision of JB/T 7962-95 "Technical conditions for circular broaches". During the revision, the chapter on performance tests was deleted, and editorial changes were made in accordance with relevant regulations. Other technical contents remained unchanged. This standard specifies the technical requirements for circular broaches and the basic requirements for marking and packaging. This standard is applicable to circular broaches for smooth cylindrical holes with tolerance grades IT7, IT8 and IT9. This standard was first published on the date of year as GB 3831-83 and was adjusted to JB/T 7962-95 in April 1996. JB/T 7962-1999 Technical conditions for circular broaches JB/T7962-1999 Standard download decompression password: www.bzxz.net

ICS25.100
Machinery Industry Standard of the People's Republic of China
JB/T7962-1999
Circular broaches
Published on 1999-05-20
Technical conditions
Implemented on 2000-01-01
National Bureau of Machinery Industry
JB/T7962-1999
This standard is a revision of JB/T7962-95 (formerly GB3831-83) "Technical conditions for circular broaches". 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/T7962-95 from the date of implementation. This standard is proposed and managed by the National Technical Committee for Tool Standardization. The responsible drafting unit of this standard is Chengdu Tool Research Institute. The main drafters of this standard are: Li Rongnian, Liu Derong, Cai Shujie, Sun Suxiang, Yu Jin. Scope
Mechanical Industry Standard of the People's Republic of China
Circular broaches
Technical conditions
This standard specifies the technical requirements for circular broaches and the basic requirements for marking and packaging. This standard is applicable to circular broaches for smooth cylindrical holes with T tolerance grades of IT7, IT8 and IT9. 2 Referenced standards
JB/T7962-1999
Replaces JB/T7962-95
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/T3832.1—1983 Types and basic dimensions of rectangular handles for broaches GB/T3832.2—1983 Types and basic dimensions of cylindrical front handles for broaches GB/T3832.3-1983 Types and basic dimensions of cylindrical rear handles for broaches 3 Technical requirements
3.1 The surface of the broach shall not have defects such as cracks, bruises, rust, etc. that affect the performance. 3.2 The cutting edge of the broach shall be sharp and shall not have burrs, chipping, or grinding burns. 3.3 The connection of the broach chip groove shall be smooth and no steps are allowed. 3.4 The main surface roughness of the broach shall be as follows: Surface of the cutting edge
-Front and back of the cutting edge:
Fine cutting teeth and calibration teeth
Rough cutting teeth
-Outer cylindrical surface of the leading part and the trailing part
Working cone surface of the center hole
Outer cylindrical surface of the shank
Grinding of the bottom of the chip groove
R,0.32μm;
R.0.32μm:
R,0.63μm;
R.0.63μm;
R,0.63μm;
R1.25μm;
R,2.5μm.
3.5 The limit deviation of the outer cylindrical diameter of the rough cutting teeth of the broach shall be as shown in Table 1. Table 1
Diameter tooth lift
>0.06~0.10
>0.100.12
Approved by the State Bureau of Machinery Industry on 1999-05-20 Limit deviation of outer diameter
Difference in tooth lift of adjacent tooth diameter
Implementation on 2000-01-01
JB/T 79621999
3.6 The limit deviation of outer diameter of broaching fine-cut teeth (except fine-cut teeth with the same size as calibration teeth) is 00mm. 3.7 The limit deviation of outer diameter of broaching calibration teeth and fine-cut teeth with the same size as them shall be in accordance with Table 2. Table 2
Tolerance of true diameter of processed hole
>0.018~0.027
> 0.027~0.036
>0.036~0.046
Limit deviation of outer diameter
No positive dimension is allowed in the calibration tooth
The consistency of the outer diameter of the calibration tooth and the same size of the fine cutting tooth is 0.005mm.
3.8 Radial runout tolerance of the outer surface of the broach to the broach reference axis: 3.8.1 The radial runout tolerance of the broach calibration tooth and its two adjacent fine cutting teeth shall not exceed the outer diameter deviation value specified in Table 2. The radial runout tolerance of the broach rear guide is the same as that of the calibration tooth. 3.8.2 The radial runout tolerance of the rest of the broach shall be in accordance with Table 3. Table 3
Ratio of the total length of the broach to its basic diameter
>15~25
3,8.3 The radial runout of each part of the broach should be in the same direction. Radial runout tolerance
3.9 The oblique runout tolerance of the taper surface of the broach shank in contact with the jaws to the broach reference axis is 0.1mm. 3.10
The type and basic dimensions of the broach shank shall be in accordance with GB/T3832.1~3832.3. The tolerance band of the outer diameter of the leading and trailing parts of the broach shall be in accordance with the door. 3.12 Limit deviation of the overall length of the broach: When the overall length of the broach is less than or equal to 1000mm
When the overall length of the broach is greater than 1000mm
3.13 Limit deviation of the geometric angles of the broach: Rake angle
Cutting tooth back angle
Calibration tooth back angle
+0°30
±3mm;bzxZ.net
±5mm.
3.14 The broach is made of W6Mo5Cr4V2 or other high-speed steel with equivalent performance. 3.15
Broach heat treatment hardness:
Cutter teeth and back guide
Front guide
Surface strengthening treatment is allowed.
4 Marking and packaging
4.1 Marking
JB/T7962-1999
63~66HRC;
60-66HRC:
40-52HRC.
4.1.1 The broach should be clearly marked with: manufacturer's trademark, product number, product specifications, front angle, broaching length, manufacturing year and month. 4.1.2 The broach packaging box should be marked with: manufacturer's name, address and trademark, product name, product number, product specifications, broaching length, broach material, number of pieces, manufacturing year and month.
4.2 Packaging
Broaches should be treated with rust prevention before packaging. The packaging must be firm and can prevent damage during storage and transportation. The sealing validity period is one year.
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