This standard specifies the shape and basic dimensions, technical requirements, test methods, inspection rules, marking and packaging of worm grinding wheels. This standard applies to ceramic bond grinding wheels for worm grinding wheels and gear grinding machines. JB/T 8373-1996 Common Abrasives Worm Grinding Wheels JB/T8373-1996 Standard download decompression password: www.bzxz.net

JB/T8373—1996www.bzxz.net
Appendix A of this standard is the appendix of the standard
This standard is proposed and managed by the National Technical Committee for Standardization of Abrasives and Grinding Tools. The drafting units of this standard are: Nanchang Grinding Wheel Factory and Qinchuan Machine Tool Factory. The main drafters of this standard are: He Kangning, Wang Junling, Li Aihua. This standard is published for the first time.
1 Scope
Standards of the Machinery Industry of the People's Republic of China
Ordinary Abrasives
Worm Grinding Wheel
JB/T8373—1996
This standard specifies the shape and basic dimensions, technical requirements, test methods, inspection rules, marking and packaging of worm grinding wheels (hereinafter referred to as grinding wheels).
This standard applies to ceramic bond grinding wheels specially used for worm grinding wheels and gear grinders. 2 Referenced Standards
The provisions contained in the following standards constitute the provisions of this standard through reference in this standard. At the time of publication of this standard, 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. GB2490—84 Method for testing hardness with sandblasting hardness machine GB 2492—84
Testing method for static balance of grinding wheels and static imbalance value GB2493--84 Inspection method for rotational strength of grinding wheels GB 282887
Batch inspection counting sampling procedure and random inspection table (applicable to inspection of continuous batches) GB9202—88 Inspection method for abrasive tools
3 Shape and basic dimensions
3.1 The cross-sectional shape of the grinding wheel is shown in Figure 1.
PMC type
Figure 1 Cross-sectional view of grinding wheel
Approved by the Ministry of Machinery Industry of the People's Republic of China on April 22, 1996 198
Implementation on July 1, 1996
The basic dimensions of the grinding wheel are shown in Table 1.
Technical requirements
The limit deviations of the basic dimensions of grinding wheels are shown in Table 2. JB/T 8373-1996
Table 1 Basic dimensions
40,50,63,80,100
50,63,80,100
63,80,100
40,50,63,80,100,125
63.80,100
Table 2 Limit deviations of basic dimensions
≥400
The geometric tolerances of grinding wheels shall comply with the following provisions. 4.2
4.2.1 Cylindricity tolerance shall not exceed 0.2mm. 4.2.2 Parallelism tolerance shall not exceed 0.1mm. 4.2.3 Coaxiality tolerance shall not exceed 0.2mm. 4.3 The grinding wheel shall not have cracks, black core, or mute sound. 4.4 The size of the defect on the edge of the grinding wheel is shown in Table 3.
40~125
Table 3 The size of the defect on the edge of the grinding wheel
Defect on the circumference of the peripheral shuttle
Along the radial direction
Along the thickness
Along the circumference
4.5 The static imbalance value of the grinding wheel shall be calculated as 0.875 times as specified in GB2492. The maximum working speed of the grinding wheel is 35m/s and 45m/s. 4.6
Defect on the edge of the inner hole
Along the thickness
Along the circumference
4.7 The hardness value of each measuring point of the grinding wheel shall comply with the allowable range specified in GB2490, and the hardness uniformity shall not exceed the grade difference value of the marked hardness grade.
5 Test methods
The test methods for appearance defects, cracks, black core, muteness and edge defects of grinding wheels shall be carried out in accordance with the provisions of GB 9202. The test methods for limit deviations and geometric tolerances of basic dimensions shall be carried out in accordance with the provisions of GB9202. 5.2
The static balance test shall be carried out in accordance with the provisions of GB2492. 5.3
The grinding wheel rotation test shall be carried out in accordance with the provisions of GB2493. 5.4
The hardness test method shall be carried out in accordance with the provisions of GB2490. 5.6 For the inspection of grinding wheel tooth profile, see Appendix A (Appendix to the standard). 499
6 Inspection rules
JB/T 8373-1996
6.1 Products shall be shipped only after passing the inspection and shall be accompanied by a qualified mark. 6.2 Table 4 gives the full inspection and random inspection items, defect classification of random inspection, defect items, inspection level and AQL value. The inspection items listed in Table 4 shall be inspected using the "one normal inspection sampling plan" listed in Table 3 of GB2828.\ Class B defects are counted by piece, and Class C defects are counted by defect item.
Table 4 Classification of inspection items
Inspection classification
Defect classification
7 Marking and packaging
Defect items
Rotational rupture
Aperture, static imbalance tolerance, crack, wrong marking Hardness, tooth shape
Outer diameter, thickness, parallelism, coaxiality, cylindricity Edge defects, incomplete or unclear marking
7.1 The product surface shall have the following markings:||tt ||Product name;
Manufacturer name;
Abrasive, particle size, hardness:
Trademark;
Model:
Tooth modulus;
Maximum working speed;
Year and month of manufacture.
Inspection level
According to 3.6.2 of GB9202
General inspection level 1
General inspection level [
—General inspection level
7.2 The packaging of the product adopts the form of foam plastic padding inside, wooden box or carton packaging outside, and steel belt or plastic woven belt reinforcement. 500
JB/T 8373—1996
Appendix A
Dimensions of sample plates for worm grinding wheel tooth profile and tooth profile measurement method (Standard Appendix)
A1 This appendix applies to the inspection of worm grinding wheel tooth profile. A2 This appendix applies to the following range:
Module m: 1.25~6mm2
Pressure angle α: 15°; 20°.
A3 Special requirements can be negotiated between the supply and demand parties. A4 The shape and size of the sample plate are shown in Figure A1 and Table A1.2/ ux
α 10
m---1.25~1.5mm
a±10°
a 10
hamin =1. 24m,hamax - 1. 30mm=1.75~6mmhmin =1.20m,
hamx = 1. 26m
Hmia =hamin + 1. 2m; Hmnx -hamax +1. 2m=rm +2hanartga
+2hamintga; Bmgx
Bmin =
Figure A1 Sample shape and size
Table A1 Sample size
α=15°
#==15°
Method of measuring grinding wheel tooth profile using sample
JB/T8373--1996
Table A1 (end)
Q==20°
When using the sample to detect the tooth profile of the worm grinding wheel, keep the proper gap Am/2 as shown in Figure A2
Worm grinding wheel
2 Measurement diagram using sample
Worm grinding wheel
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