JB/T 3227-1999 This standard is a revision of JB 3227-83 "General Technical Conditions for High Precision Gear Hobs". During the revision, only editorial changes were made according to relevant regulations, and the technical content remained unchanged. This standard specifies the technical requirements and basic requirements for marking and packaging of high precision gear hobs (hereinafter referred to as hobs) with a module of 1~10mm (according to GB/T 1357-1987 "Module of Involute Cylindrical Gears"). The accuracy grade of the hob is AAA. The hobs manufactured according to this standard are used to process cylindrical gears with a basic tooth profile according to GB/T 1356-1988 "Basic Tooth Profile of Involute Cylindrical Gears" and an accuracy according to GB/T 10095-1988 "Accuracy of Involute Cylindrical Gears". This standard is applicable to hobs with a size equal to or greater than Type I in GB/T 6083-1985 "Basic Types and Sizes of Gear Hobs". This standard was first published on . JB/T 3227-1999 General Specifications for High Precision Gear Hobs JB/T3227-1999 Standard download decompression password: www.bzxz.net

ICS25.100
Machinery Industry Standard of the People's Republic of China
JB/T3227-—1999
High Precision Gear Hob
Published on 1999-05-20
General Technical ConditionsWww.bzxZ.net
Implemented on 2000-01-01
National Bureau of Machinery Industry
JB/T3227—1999
This standard is a revision of JB3227—83 "General Technical Conditions for High Precision Gear Hob". During the revision, only editorial changes were made according to relevant regulations, and the technical content remained unchanged. This standard replaces JB3227—83 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: Chengdu Tool Research Institute. The main drafters of this standard: Xu Weimin and Shen Shichang. 1 Scope
Machinery Industry Standard of the People's Republic of China
High Precision Gear Hob
General Technical Conditions
JB/T3227-1999
Replaces JB3227-83
This standard specifies the technical requirements and basic requirements for marking and packaging of high precision gear hobs (hereinafter referred to as hobs) with a module of 1~10mm (according to GB/T13571987 "Module of Involute Cylindrical Gear"). The accuracy code of the hob is AAA grade.
The hobs manufactured according to this standard are used to machine cylindrical gears with a basic tooth profile according to GB/T13561988 "Basic Tooth Profile of Involute Cylindrical Gear" and an accuracy
according to the six-grade accuracy specified in GB/T10095-1988 "Accuracy of Involute Cylindrical Gear". This standard applies to hobs with dimensions equal to or greater than Type I in GB/T6083-1985 "Basic Types and Dimensions of Gear Hobs". Note: When the hobbing machine accuracy and the installation accuracy of the tool and workpiece are in good condition, the hobs manufactured according to this standard can also be used to process gears with accuracy above Grade 6.
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 parties using this standard should explore the possibility of using the latest versions of the following standards. GB/T 1356—1988
GB/T1357—1987
GB/T60831985
GB/T 10095—1988
3 Technical requirements
Basic tooth profile of involute cylindrical gear
Module of involute cylindrical gear
Basic type and size of gear hob
Precision of involute cylindrical gear
3.1 The hob is made of high-performance high-speed steel, and its carbide uniformity should not exceed grade 4 for hobs with a diameter not exceeding 100mm, and should not exceed grade 5 for hobs with a diameter greater than 100mm. 3.2 The hardness of the cutting part of the hob is 65~67HRC. 3.3 The hob surface shall not have cracks, chipping, burns or other defects that affect the performance. 3.4 The surface roughness of the hob shall be as specified in Table 1. Table 1
Inspection surface
Inner hole surface
Pillow block outer circle
Front of cutter
Back of cutter
Top and fillet of cutter
Approved by the State Bureau of Machinery Industry on May 20, 1999 Surface roughness
Implementation on January 1, 2000
JB/T3227-1999
3.5 The limit deviation of the outer diameter of the hob is h15, the limit deviation of the total length is js15, and the other main tolerances are specified in Table 2 Table 2
Inspection items and schematic
Diameter deviation
1 The length of the bell mouth that exceeds the tolerance on the inner hole matching surface should be less than 2% of the matching length on each side. The length of the part that exceeds the tolerance on both sides of the keyway should not be greater than half of the key width on each side. 2 When checking the accuracy of the hole, the calibration mandrel should be able to pass through the radial runout of the hole shaft table
Center AAAAAO
End face runout
Radial runout of the cutter tooth
The maximum difference tolerance of the distance from the tooth profile to the center of the inner hole within one turn of the hob
Module (mm)
Inspection items and schematics
Radial front of the cutter tooth
JB/T3227-1999
Table 2 (continued)
Within the measurement range, accommodate the two parallel front of the actual cutter tooth Distance between planesDifference of adjacent pitches of chip groove
On the same circle near the rolling force dividing circle
The maximum difference between two adjacent pitches
The maximum cumulative error of chip groove pitch
On the same circle near the rolling force dividing circle, pay attention to the maximum error of the mutual position between the front faces of two cutters1~2
Inspection items and schematics
JB/T3227-1999
Table 2 (continued)
Parallelism of the front face of the cutter tooth with the axis of the inner hole (only for straight groove) 0.5
L1=L (2a+h
The distance between two planes parallel to the theoretical front face that accommodate the actual front face within the measuring range close to the dividing circle. The lead error of the groove (only for spiral grooves) AMOAO
The deviation between the front edge of the chip groove and the theoretical spiral face within the measuring range close to the dividing circle
Tooth profile error\
The normal distance between two theoretical straight lines that accommodate the actual tooth profile within the measuring range in the inspection section 8p
Every 100mm
Length
Every 100mm
Length
Every 100mm
Length
Every 100mm
Length
1) When the gear being cut adopts the designed tooth shape, the tooth shape type and tolerance value of the hob shall be agreed upon separately by the user and the tool factory. Table 2 (continued)
Inspection items and schematics
Module mm
Tooth shape error
Tooth thickness deviation (only negative allowed) || tt||Deviation of tooth thickness measured at the theoretical tooth height of the hob pitch circle from the nominal tooth thickness
Helix error of adjacent cutting edges
JB/T3227-1999
The maximum axial error of the intersection of the adjacent cutting front edge and the concentric cylindrical surface of the inner hole to the theoretical helix of the hobHelix error of the cutting edge within one turn of the hobOne turn
The maximum axial error of the intersection of the cutting edge and the concentric cylindrical surface of the inner hole to the theoretical helix within one turn of the hob Helix error inspection items and schematic diagram
Table 2 (end)
JB/T3227-1999
Helix error of the cutting edge within three turns of the hob 5t
Meshing error of adjacent teeth
When measuring the hob cutting edge along the meshing line direction, the maximum error within the entire length of the meshing line 8
3.6When the manufacturer does not have the conditions to detect the meshing error, the tolerances of the tooth shape and helix should be given according to inspection items 10, 12, 13 and 14 respectively. When the specified meshing tolerance (inspection items 15 and 16) can be met, it is allowed to increase the tolerances of the tooth shape and helix, and its value is given by inspection items 10A and 13A, and item 14 may not be inspected. 6
JB/T3227-1999
3.7 The length of the qualified part of the tooth profile accuracy on the side of the hob tooth shall not be less than half of the tooth length. 4 Marking and packaging
4.1 Marking
4.1.1 The end face of the hob shall be marked with: manufacturer's trademark, module, reference tooth profile angle, helix lead angle on the hob cylinder, helix direction (no mark for right-handed), accuracy code, material, and year of manufacture. 4.1.2 The packaging box shall be marked with: manufacturer's name, address and trademark, product name, module, reference tooth profile angle, accuracy code, material, year of manufacture, and number of this standard.
The hob shall be treated with anti-rust treatment before packaging, and measures shall be taken to prevent damage during packaging and transportation. 7
Mechanical Industry Standard
General Technical Requirements for High Precision Gear Hobs
JB/T3227—1999
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: Postal Code 100044)*
Format 880×1230
1/16 Printing Sheet 3/4
4 Word Count 16000
First Edition in September 1999
: First Printing in September 1999
Print Quantity 1-500
Price 1000 Yuan
99-391
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