JB/T 7968.1-1999 This standard is a revision of JB/T 7968.1-95 "Basic types and dimensions of gear hobs before grinding". During the revision, only editorial changes were made according to relevant regulations, and the technical content remained unchanged. This standard is part of the JB/T 7968 "Gear hobs before grinding" series of standards, which includes two parts: JB/T 7968.1: Basic types and dimensions JB/T 7968.2: Technical conditions This standard specifies the basic types and dimensions of integral gear hobs before grinding (hereinafter referred to as hobs). The hobs are made of single-start, right-handed, and the chip grooves are straight grooves parallel to the hob axis. This standard is applicable to hobs with a module of 1~10mm (the module is in accordance with GB/T 1357-1987 "Module of involute cylindrical gears"). This standard was first issued as GB 8062.1-87 on January 1, 1996 and was adjusted to JB/T 7968.1-95 in April 1996. JB/T 7968.1-1999 Gear hobs before grinding Part 1: Basic types and dimensions JB/T7968.1-1999 Standard download decompression password: www.bzxz.net

ICS25.100
Machinery Industry Standard of the People's Republic of China
JB/T7968.1~7968.2-1999
Gear Hob Before Grinding
Published on 1999-05-20
State Machinery Industry Bureau
Implemented on 2000-01-01
JB/T 7968.1~7968.2-1999
JB/T7968.1—1999
JB/T7968.2—1999
Part 1: Basic types and dimensions
Gear hobs before grinding
Part 2: Technical conditions
Gear hobs before grinding
JB/T7968.1-1999
This standard is a revision of JB/T7968.1—95 (formerly GB8062.1—87) "Basic types and dimensions of gear hobs before grinding".
During the revision, only editorial modifications were made in accordance with relevant regulations, and the technical content remained unchanged. This standard is part of the JB/T7968 series of standards for pre-grinding gear hobs, which include the following two parts: Pre-grinding gear hobs Part 1: Basic types and dimensions JB/T7968.1-1999
Pre-grinding gear hobs Part 2: Technical conditions JB/T7968.2-1999
This standard replaces JB/T7968.1--95 from the date of implementation. Both Appendix A and Appendix B of this standard are appendices of the standard. 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 Jiang Gongwei, Zhang Chao and Shen Shichang. Scope
Standard of the Machinery Industry of the People's Republic of China
Gear Hobs Before Grinding
Part 1: Basic Types and Dimensions
JB/T7968.1-1999
Replaces JB/T7968.1-95
This standard specifies the basic types and dimensions of integral gear hobs before grinding (hereinafter referred to as hobs). The hobs are made into single-head, right-handed, and the chip grooves are straight grooves parallel to the axis of the hob. This standard is applicable to hobs with a module of 1~10mm (module according to GB/T1357-1987 "Module of Involute Cylindrical Gears"). 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 are subject to revision, and parties using this standard should explore the possibility of using the latest versions of the following standards. GB/1357—1987
GB/T 6132—1993
Basic types and dimensions
Zhekai cylindrical gear module
Interchangeable dimensions of milling cutters and milling cutter bars
The basic types and dimensions of hobs shall be in accordance with the provisions of Figure 1 and Table 1. AAAAA
Approved by the State Machinery Industry Bureau on May 20, 19992
Implemented on January 1, 2000
Module series
JB/T7968.1-1999
1The diameter of the hob shaft table shall be determined by the tool factory, and its size shall be as large as possible. 2According to user requirements, the hob can be made left-handed
3The size and deviation of the keyway shall be in accordance with GB/T6132. Marking example
The marking of the left-handed front gear hob with module m=2.5mm and tooth top convex angle II is front gear hob m2.5I.LJB/T7968.1—12999a
JB/T7968.1-1999
Appendix A
(Appendix of the standard)
Basic calculated dimensions of the hob
The basic calculated dimensions of the hob shall be in accordance with the provisions of Figure A1 and Table A1. Figure A1
1°14'www.bzxz.net
1°29°
1°45'
3°23'
4°08\
JB/T7968.1-1999
Appendix B
(Standard Appendix)
Axial tooth profile dimensions of hob
Axial tooth profile dimensions of hob shall be in accordance with the provisions of Figure B1 and Table B1. B1
(Applicable to 2<20)
(Applicable to 2≥20)
Type I enlargement
Note: Two convex angle types can be selected, and [Type] is recommended. Figure B1
Type II enlargement
r, r:=0.3m
(m modulus)
Modulus series
20°3*
JB/T 7968.1—1999
Grinding amount
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