JB/T 7983-2001 This standard is a revision of JB/T 7983-1995 "Bolt-fastened flat grinding wheels" in order to coordinate with the currently implemented national standards such as GB/T 2484-1994 "Code and Marking of Ordinary Abrasives" and GB/T 2485-1997 "Technical Conditions of Ordinary Abrasive Grinding Wheels". This standard specifies the product classification, technical requirements, test methods, inspection rules, marking and packaging of bolt-fastened flat grinding wheels. This standard is applicable to resin bond bolt-fastened flat grinding wheels for double-end grinders. The working part of the grinding wheel can also be made of vitrified bond. This standard was first issued in 1971 as JB 1198-71, revised for the first time in April 1983 as GB 3601-83, and adjusted to JB/T 7983-95 in April 1996. This is the second revision. JB/T 7983-2001 General Abrasives Bolt-fastened Flat Grinding Wheels JB/T7983-2001 Standard download decompression password: www.bzxz.net

JB/T 7983—2001
Foreword
This standard is a revision of JB/T7983-1995 "Bolt-fastened flat grinding wheels". This standard replaces JB/T7983—1995 from the date of implementation. Appendix A of this standard is the standard appendix, and Appendix B is the reminder appendix. This standard is proposed and managed by the National Technical Committee for Standardization of Abrasives and Grinding Tools. The drafting unit of this standard: Baige (Group) Co., Ltd. The main drafters of this standard: Lu Zongyan, Jiang Mengning, Chen Deguang, Chen Jianmin, Xia Hong, Liu Minqiang.
This standard was first issued as a machinery industry standard in 1971. It was first revised to a national standard in 1983. It was adjusted to a machinery industry standard in 1995.
1 Scope
Mechanical Industry Standard of the People's Republic of China
Ordinary abrasives!
Bonded abrasive products-Disc wheel with inserted nutsJB/T 7983—2001
Replaces JB/T7983-1995
This standard specifies the product classification, technical requirements, test methods, inspection rules, marking and packaging of bolt-fastened flat grinding wheels. This standard is applicable to resin bonded bolt-fastened parallel grinding wheels (hereinafter referred to as grinding wheels) for double-end grinders. The working part of the grinding wheel can also be made of vitrified bond.
Cited 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/T2484—1994
Code and marking of common abrasive tools
GB/T 2485—1997
Technical conditions for grinding wheels of common abrasive tools
GB/T 2490--1984
Method for testing the hardness of abrasive tools by sandblasting hardness machineGB/T2495—1996 Packaging of common abrasive tools
GB/T 2828—1987
JB/T 7992--1995
3 Product classification
Batch inspection counting sampling procedure and sampling table (applicable to inspection of continuous batches) Inspection method of abrasive tools
3.1 The shape of the grinding wheel shall be as specified in Figure 1, code 36. Figure 1
3.2 Grinding wheel bond code: B.
3.3 The basic dimensions of the grinding wheel shall be as specified in Table 1.
3.4 ​​The marking content and marking method of the grinding wheel shall comply with the provisions of GB/T2484. Approved by China Machinery Industry Federation on March 29, 2001 and implemented on July 1, 2001
Note: The above dimensions shall be used first
Technical requirements
40.50,60,63,
75,80,90,100
50,70,80.100
The limit deviations of the basic dimensions of the grinding wheel are shown in Table 2. Item
Outer diameter D
Thickness T
Aperture H
The geometric and positional tolerances of the grinding wheel are shown in Table 3.
Grinding wheel parallelism
Grinding wheel flatness
4.3 The nut fastener shall not be higher than the end face of the grinding wheel. Metric
JB/T7983—2001
16,20,25.4,30,
50,254.280,350
4.4 The appearance of the grinding wheel should be uniform in color and should not have delamination, inclusions and cracks. The position of the screw hole
see Appendix A (Appendix of the standard)
Nut M1C
Pin hole a12 depth 12
Pin hole b$14 depth 13
4.5 The grinding wheel should be hardness tested. The uniformity of the sandblasting hardness of the grinding wheel should not be greater than 1.5h (h is the difference in the marking hardness grade). The average measurement value of the grinding wheel hardness should fall within the allowable range of the marking hardness grade specified in the table of GB/T2490~1984. 5
Test methods
The test methods for appearance defects, limit deviations of basic dimensions, and geometric tolerances of grinding wheels shall comply with the provisions of JB/T7992. The test methods for hardness of grinding wheels shall comply with the provisions of GB/T2490. 5.2
6 Inspection rules
6.1 The factory inspection (or acceptance) of products shall be carried out item by item in accordance with the technical requirements of this standard. Only qualified products can be shipped and accompanied by a certificate of conformity. 476
JB/T7983—2001
6.2 The items to be inspected shall be sampled and inspected in accordance with GB/T2828. The sampling plan adopts a single sampling plan.
The inspection of BI-type unqualified products adopts the general inspection level I. The inspection of BI-type unqualified products adopts the special inspection level S-2. The classification of unqualified items and the AQL value of qualified quality level are shown in Table 4. Table 4
BI type nonconformity
Appearance defects, basic size limit deviation
Note: AQI values ​​are the number of nonconformities per 100 units of products. Marking and packaging
7.1 The marking of grinding wheels shall be carried out in accordance with the provisions of GB/T2485. 7.2 The packaging of grinding wheels shall be carried out in accordance with the provisions of GB/T2495. BI type nonconformity
Hardness, geometric tolerance
JB/T79832001
Appendix A
(Appendix to the standard)
Position of screw holes and pin holes
A1 The positions of the screw holes and pin holes of the grinding wheel shall correspond to the positions of the bolt holes and pins on the fixed chuck. A2 Figures A1 to A9 and Tables A1 to A9 show the positions of the bolt holes and pins in the top view of the fixed chuck. The diameter and coordinate dimensions of the distribution circle where the bolt holes and pins are located are the theoretically correct dimensions. The angles are the theoretically correct angles. A3 The position tolerance of the bolt hole on the fixed chuck is 0.3mm. A4 a and b pins are on the same diameter, b is in the symmetrical position of a. Dz=300mm
Distribution circle diameter, mm
D=350mm
Number of screw holes/angle
3/120°
6/60°
JB/T 7983-2001
Distribution circle diameter, mm
Distribution circle diameter, mm
D=400mm
D=450mm
Number of screw holes/angle
4/90°
8/45°
Number of screw holes/angle
5/72°
10/36°
JB/T 7983-2001
Distribution circle diameter, mm
Distribution circle diameter, mm
304-80
D=500mm
Number of screw holes/angle
3/120°
5/72°
10/36°
Number of screw holes/angle
3/120°
6/60°
12/30°
JB/T 7983—2001
D=600mm
Distribution circle diameter, mm
Number of screw holes/angle
12/30°
JB/T 7983-2001
D=750mmwww.bzxz.net
Distribution circle diameter, mm
Number of screw holes/angle
3/120°
8/45°
12/30°
16/22°30
JB/T 7983--2001
D=900mm
Distribution circle diameter, mm
Number of screw holes
JB/T 7983—2001
D=1060mm
Distribution circle diameter, mm
Number of screw holes
B1 Holes and grooves in the use part of the grinding wheel
JB/T7983--2001
Appendix B
(Suggestive appendix)
Bolt-fastened parallel grinding wheel with hole and groove structure B1.1 It is allowed to make a structure with holes and grooves in the use part of the grinding wheel, as shown in Figure B1. D
Usage part
Installation part…
B1.2 Code for bolt-fastened parallel grinding wheels with hole and slot structure: 36-KC
a) With hole and slot
b) With hole but no slot
c) With slot but no hole 36-C
Nut fastener
Nut fastener adopts an integral structure, as shown in Figure B2. B2.1 The shape is molded, with a fillet of R0.5~1.0mm. B2.2 The maximum and minimum weights of the same batch of single pieces shall not differ by more than 1.5g. 485
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