GB/T 9205-1988 Segmented gear hob GB/T9205-1988 standard download decompression password: www.bzxz.net

National Standard of the People's Republic of China
Insterted blade gear hobs
UDC 621.9.02
GB 9205-8B
This standard applies to insert gear hobs with module 9 to 40mm (GB1357-78 "Involute cylindrical gear module"). Insert gear hobs manufactured according to this standard are suitable for machining gears with reference tooth profiles specified in GB1356-78 "Involute cylindrical gear reference tooth profiles".
1 Type and basic dimensions
1.1 The type and basic dimensions of insert gear paint cutters shall be as specified in the following figure and table. Insert gear hobs are made into single-head, right-handed, zero-degree rake angle, and the chip groove is a straight groove parallel to its axis. Type with axial keyway
Type with end face keyway
Approved by the National Machinery Industry Commission on 19B8-05-12 and implemented on 198-0F-01
1st series, No. 2 Series
GB9205—88
Type with axial keyway
Note: The diameter of the hob shaft is determined by the tool factory, and its size should be as large as possible. ② According to the production requirements, the hob can be made into a left-handed rotation. 215
Type with end face keyway
1.2 The key plate gear hob specified in this standard is composed of a cutter body, a blade, a wedge, a fixing ring and other parts. The size of each part is determined by the tool factory. The mating surface of the assembled lock plate gear cutter should be tightly matched. 2 Technical requirements
The insert gear specified in this standard The accuracy grade, technical requirements and performance tests of gear hobs shall comply with GB6084-85 "General Technical Conditions for Gear Hobs" except for the following provisions.
2.1 The involute basic worm shall be used to inspect the tooth shape of the segmented gear hob. 2.2 The heat treatment hardness of the cutter body and the fixing ring of the segmented gear hob is stipulated as follows; the inner hole and end face of the cutter body shall be surface quenched, and the hardness shall not be less than HRC45. The heat treatment hardness of the fixing ring shall not be less than HRC30. 2.3 After the test, the blade and fixing ring of the segmented gear hob shall not be loose. Marking and Packaging
GB 9205-88
8.1 The end face of the key plate gear hob should be marked with: manufacturer's trademark, module, base male tooth angle, helix angle on the hob cylinder, helix direction (right-handed is not marked), back-cutting amount, accuracy grade, material (ordinary high-speed steel is not marked), production license number, and manufacturing year. 8.2 The hob should be treated with rust prevention before packaging. The packaging must be firm and prevent damage during transportation. Axial keyway size
Basic size
A2 end face key size
Basic size
GE 920688
Appendix A
Dimensions of axial chain grooves and end keyways of insert gear hobs (supplement)
Limit deviations
Basic dimensions
Limit deviations
Basic dimensions
Limit deviations
Basic dimensions
Limit deviations
GB 9205-BB
Basic dimensions
Limit deviations
Basic dimensions
Limit deviations
First series
Second series
GB 9205—8B
Appendix B
Calculated dimensions of segmented gear hobs
(reference part)
211,38
Calculated dimensions
6"23
7°19'
First series
Second series
GBB205—BB
Appendix C
Axial tooth profile dimensions of segmented gear hobs
(reference part)
Axial tooth
20°01'45"
20°02'06
20°02°28\
20°02'52bZxz.net
20\03'29\
20°0352”
20°04'13
20°04'59*
20°04' 38*
20°05'25
20°06°11\
20°06'52*
20°08'34*
20°07'49*
20\09'04\
h rn = 2. 45 t
ri= r2= 0, 3m
-module)
14,160
39-463
This standard is proposed by the National Tool Standardization Technical Committee! This standard is under the jurisdiction of the Chengdu Tool Research Institute of the National Machinery Committee. This standard is drafted by the Chengdu Tool Research Institute of the National Machinery Committee
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