JB/T 7970.2-1999 This standard is a revision of JB/T 7970.2-95 "Technical requirements for disc gear milling cutters". During the revision, the performance test chapter was deleted and editorial changes were made in accordance with relevant regulations. The technical content has not changed. This standard is part of the JB/T 7970 "Disc gear milling cutter" series of standards, which includes two parts: JB/T 7970.1: Basic types and dimensions JB/T 7970.2: Technical requirements This standard specifies the technical requirements, marking and basic requirements for packaging of disc gear milling cutters (hereinafter referred to as milling cutters). This standard is applicable to milling cutters with a reference tooth angle of 20° and a module ranging from 0.3 to 16 mm for machining spur involute cylindrical gears. This standard was first issued in 1988 as GB 9063.2-88 and was adjusted to JB/T 7970.2-95 in April 1996. JB/T 7970.2-1999 Disc gear milling cutter Part 2: Technical conditions JB/T7970.2-1999 Standard download decompression password: www.bzxz.net

ICS25.100.20
Machinery Industry Standard of the People's Republic of China
JB/T7970.2-1999
Disc gear milling cutters
Part 2: Technical conditions
Issued on 1999-05-20
IB/T7970.2-1999
National Bureau of Machinery Industry
Implementation on 2000-01-01
JB/T 7970.2-1999
This standard is a revision of JB/T7970.2-95 (formerly GB9063.2-88) "Technical conditions for disc gear milling cutters". During the revision, the chapter on performance test methods was deleted, and editorial modifications were made in accordance with relevant regulations. Other technical contents remained unchanged. This standard is part of the JB/T7970 series of standards for disc gear milling cutters, which includes the following two parts: JB/T 7970.1—1999
JB/T7970.2—1999
Disc gear milling cutters
Disc gear milling cutters
Part 1: Basic types and dimensions
Part 2: Technical conditions
This standard replaces JB/T7970.2—95 from the date of implementation. Appendix A of this standard is a prompt appendix
This standard is proposed and managed by the National Technical Committee for Tool Standardization. The responsible drafting unit of this standard: Chengdu Tool Research Institute. The main drafters of this standard: Chen Qitao and Shen Shichang. Mechanical Industry Standard of the People's Republic of China
Mechanical Industry Standard of the People's Republic of China
Disc Gear Milling CutterbzxZ.net
Part 2: Technical Conditions
JB/T7970.2-1999
Replaces JB/T79702-95
This standard specifies the basic requirements for the technical requirements, marking and packaging of disc gear milling cutters (hereinafter referred to as milling cutters). This standard applies to milling cutters with a reference tooth profile angle of 20° and a module of 0.3-25mm for machining spur involute cylindrical gears. Technical Requirements
The milling cutter is made of W6Mo5Cr4V2 or high-speed steel with equivalent performance. The hardness of the working part of the milling cutter is 63-66HRC. There shall be no cracks, front edges, burns or other defects that affect the performance of the milling cutter. The surface roughness of the milling cutter shall comply with the following provisions:
The front face of the cutter teeth, the inner hole surface and both end faces: R1.25um; the back face of the toothed shovel: m≤16mm, R,12.5um: m>16mm, R,25μm:
The limit deviation of the outer diameter D of the milling cutter shall be h16, and the limit deviation of the thickness B shall be h13. The limit deviation of the inner hole d of the milling cutter shall be H7.
The remaining manufacturing tolerances of the milling cutter shall not exceed the provisions of Table 1. Table 1
Radial run-out of the circumferential edge in front of the cutter teeth to the inner hole axis within the cutting depth range: adjacent teeth
One rotation of the milling cutter
Oblique circular run-out of the side edge
Parallelism of the two end faces
Difference in distance from the two end faces of the milling cutter to any tooth profile point on the same diameter
Tooth profile tolerance:
Involute part
Tooth item and fillet part
Approved by the State Machinery Industry Bureau on 1999-05-20 0.30
Implementation on 2000-01-01
Marking and packaging
JB/T7970.2—1999
The end face of the milling cutter should be marked with: manufacturer's trademark, module, reference tooth profile angle, milling cutter number, and range of the number of teeth of the gear to be milled. 3.1.1
2 The packaging box should be marked with: manufacturer's name, address and trademark, product name, module, reference tooth profile angle, milling cutter number, material, manufacturing year, and this standard number.
The milling cutter should be treated with rust prevention before packaging, and measures should be taken to prevent damage during packaging and transportation. 2
JB/T7970.2—1999
Appendix A
(Suggestive Appendix)
Tooth profile coordinates of milling cutter transition curve and coordinates of each point on the involute (m=100
B--Coordinates of the connection point between the tooth bottom arc and the straight line (Type I) or the involute (Type II): C
Coordinates of the connection point between the straight line and the involute:
Coordinates of the intersection point between the top circle and the involute:
Involute The pendant marks of each point on the line:
The center coordinates of the arc at the bottom of the tooth:
The radius of the arc.
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When calculating the tooth shape
The number of teeth based on
After grouping, the number of teeth applicable to each milling cutter
8
55~134
|15
JB/T7970.2—1999
Tooth profile coordinates of milling cutter transition curve
Coordinates of each point on the transition curve part of the tooth profile Point B
Arc center
206492
210877
212697
214666
216373
218213
21 8973 | | tt | |tt||180000
190000
2000 00 | | tt | | 220000 | 0
Coordinates of each point of the involute
140000
160000 | 0000
130000
140000||tt| |150000
160000
180000
190000
200000
210000
230000
270000
155270
110000
1 20000
140000
100000||tt ||110000
120000
130000
140000
160000
180000
190000
230000
250000
136,580||tt| |L4L087
JB/T7970.2
JB/T 7970.2 | | tt | 0 | |tt |000
110000
120000
140000
160000
170000
180000
190000
210000| |tt||220000
230000
270000
100000
120000
140000
160000|| tt||170000
180000
190000
200000
210000
131-504
136436
141449|| tt||14L087
JB/T7970.2
People's Republic of China
Mechanical Industry Standard
Disc Gear Milling Cutter
Part 2: Technology Conditions
JB/T 797021999
Published by the Machinery Standardization Research Institute of the Ministry of Machinery Industry Printed by the Machinery Standardization Research Institute of the Ministry of Machinery Industry (No. 2, Shouti South Road, Beijing
Book size 880×1230
First issue of XX, 1999 Edition
Print run 1-500
Postal code 100044)
Printing sheet XX words xXX,XXX
First printing in XX month 1999
Price XWXXX Yuan
99-401
661026
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