This standard specifies the product classification, technical requirements, test methods, inspection rules and marking, packaging and storage of grinding wheels with ball base for grinding bearings. This standard applies to grinding wheels with tapered rollers and ball base for grinding bearings. JB/T 8338-1996 Common abrasives grinding wheels with ball base for grinding bearings JB/T8338-1996 Standard download decompression password: www.bzxz.net

Mechanical Industry Standard of the People's Republic of China
Ordinary Abrasives
Grinding Wheels for Ball-Based Grinding of Grinding Bearings
Subject Content and Scope of Application
JB/T 8338—96
This standard specifies the product classification, technical requirements, test methods, inspection rules and marking, packaging and storage of grinding wheels for ball-based grinding of grinding bearings (hereinafter referred to as grinding wheels).
This standard applies to resin grinding wheels for ball-based grinding of tapered roller bearings. 2
Referenced Standards
GB/T2476Abrasive Code
Abrasive Grain Size and Composition
GB2477
Ordinary Abrasive Code and Marking
GB/T 2484
GB 2490
GB2492
GB2493
GB2494
GB2495
GB2828
GB9202
3Product classification
Method for testing hardness with sandblasting hardness machine
Test method for static balance of grinding wheel and static imbalance valueTest method for rotation strength of grinding wheel
Safety rules for abrasive tools
Marking and packaging of abrasive tools
Batch inspection counting sampling procedure and sampling table (applicable to inspection of continuous batches) Inspection method for abrasive tools
3.1 Shape code: 42.
3.2 Bonding agent code: B.
3.3 The cross-sectional shape of a grinding wheel is shown in Figure 1.
Fine-grained layer
3.4 ​​The basic dimensions of the grinding wheel shall comply with the provisions of Table 1. H
Approved by the Ministry of Machinery Industry of the People's Republic of China on April 11, 1996 and implemented on October 1, 1996
JB/T8338-96www.bzxz.net
3.5 The abrasive used for the grinding wheel shall comply with the provisions of GB/T2476 and GB2477. 3.6 The hardness classification of the grinding wheel shall comply with the provisions of GB/T2484. 3.7 The maximum operating speed of the grinding wheel is 35m/s and 40m/s respectively. 3.8 Grinding wheel marking example:
42-500X80/30X305-WA46/120PB-35m/sJB/T8338---96
Maximum working linear speed
Resin bond
Hardness of coarse-grained layer
Grit of fine-grained layer
-Grit of coarse-grained layer
-Aperture H
-Thickness of fine-grained layer
Thickness of coarse-grained layer
Outer diameter D
Shape code
4 Technical requirements
4.1 The limit deviation of the basic size of the grinding wheel shall comply with the provisions of Table 2 and Table 3. Table 2
Limit deviation
Thickness of fine-grained layer T
4.2 The geometric tolerance of the grinding wheel shall comply with the provisions of Table 4. Item
Parallelism, coaxiality and flatness of both end faces JB/T8338—96
4.3 The grinding wheel shall not have cracks, inclusions, and coarse grains shall not be mixed in the fine-grained layer. 4.4 The grinding wheel shall be subjected to static balance test.
4.5 The grinding wheel shall be subjected to rotation strength test.
4.6 The grinding wheel shall be subjected to hardness test.
Test method
Limited deviation
The test method for appearance defects, dimensional deviation and geometric tolerance of the grinding wheel shall comply with the provisions of GB9202. The static balance test method of the grinding wheel shall comply with the provisions of GB2492, 5.3 The test method for the rotation strength of the grinding wheel shall comply with the provisions of GB2493 and GB9202. The test method for the hardness of the grinding wheel shall comply with the provisions of GB2490. 5.4
6 Inspection rules
6.1 The product delivery (or delivery) inspection shall be carried out item by item in accordance with the technical requirements of this standard. Only qualified products can be shipped with a quality certificate. 6.2 The grinding wheel rotation strength shall be fully inspected in accordance with the provisions of GB9202, and other inspection items shall be sampled and inspected in accordance with GB2828. The sampling plan adopts the sub-normal inspection plan. The inspection level adopts the general inspection level 1.
The qualified quality level (AQL) shall comply with the provisions of Table 5. Table 5
Class B failure
Aperture, crack, wrong marking
Marking, packaging and storage
Static balance, hardness of rough layer
Class C failure
Outer diameter, thickness, parallelism, coaxiality, flatness, incomplete or unclear marking25
The marking, packaging and storage of grinding wheels shall comply with the provisions of GB/T2484, GB2494 and GB2495. Additional remarks:
This standard was proposed by the National Technical Committee for Standardization of Abrasives and Grinding Tools. This standard is under the jurisdiction of the Zhengzhou Abrasives and Grinding Research Institute of the Ministry of Machinery Industry. This standard was drafted by Zhengzhou Baige (Group) Co., Ltd. The drafters of this standard are Yang Baolin and Guo Yingguang. 493
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