JB/T 7991.4-2001 This standard is a revision of JB/T 7991.4-1995 "Electroplated Diamond Grinding Heads". The size specifications and abrasive types were added during the revision. This standard specifies the shape, code, size, technical requirements, test methods and inspection rules of electroplated superhard abrasive products - grinding heads. This standard is applicable to electroplated metal bond superhard abrasive grinding heads. This standard was first issued in January 1987 as GB 8068-87, and the standard number was adjusted to JB/T 7991.4-95 in April 1996. This is the first revision. JB/T 7991.4-2001 Electroplated Superhard Abrasive Products Grinding Heads JB/T7991.4-2001 Standard download decompression password: www.bzxz.net

JB/T 7991.4—2001
This standard is a revision of JB/T7991.4—1995 "Electroplated Diamond Grinding Head". This standard supplements the content of JB/T7991.4—1995 accordingly, adding size specifications and abrasive types. The name of this standard is changed to "Electroplated Superhard Abrasive Grinding Head". This standard replaces JB/T7991.4—1995 from the date of implementation. This standard is proposed and managed by the National Technical Committee for Standardization of Abrasives and Grinding Tools. The drafting unit of this standard: Suzhou Grinding Wheel Factory. The participating drafting units of this standard: Sixth Grinding Wheel Factory. The main drafters of this standard: Chen Baoheng, Mo Yunshui, Xue Mingzhang. This standard was first issued in June 1987 as GB8068--87, and the standard number was adjusted to JB/T7991.4-1995 in April 1996. This is the first revision.
Mechanical Industry Standard of the People's Republic of China
Electroplated superabrasive products
Electroplated superabrasive products-Mounted wheel
JB/T 7991.4—2001
Replaces JB/T 7991.4—1995
This standard specifies the shape, size, technical requirements, test methods and inspection rules of electroplated superabrasive grinding heads. This standard applies to electroplated metal bond superabrasive grinding heads. 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 are subject to revision, and parties using this standard should explore the possibility of using the latest versions of the following standards. GB/T2828-1987 Batch inspection counting sampling procedure and sampling table (applicable to inspection of continuous batches) GB/T6405—1994 Varieties of artificial diamond or cubic boron nitride GB/T6406--1996 Superhard abrasives Diamond or cubic boron nitride particle size GB/T6408-1986 Technical conditions for cubic boron nitride JB/T7989—1997
Shape and size
Superhard abrasives Technical conditions for artificial diamond
The shape of the electroplated superhard abrasive grinding head shall comply with the provisions of Figures 1 and 2, and the size shall comply with the provisions of Tables 1 and 2. 0.5×45
Approved by China Machinery Industry Federation on 2001-03-29 244
2001 - 07 - 01 On-site
JB/T7991.4—2001
Table 1 (Complete)
Note: Dimensions and specifications not specified in this standard shall be agreed upon by both parties. 0.5×45
JB/T 7991. 4-2001
Table 2 (Complete)
Note: Dimensions and specifications not specified in this standard shall be agreed upon by both parties. Technical requirements
4.1 General requirements
4.1.1 The superhard abrasives used in the products shall comply with the requirements of GB/T6405, GB/T6406, GB/T6408 and JB/T7989. 4.1.2
The hardness of the substrate shall not be less than 50HRC,
The coaxiality deviation of the substrate core rod shall not be greater than 0.005mm. 4.1.3:www.bzxz.net
4.1.4The roughness Ra value of the substrate shall not be less than 0.8um. ​​4.2 Appearance requirements
The abrasive particles of the coating shall be evenly distributed and firmly combined. There shall be no tumors higher than the abrasive particles on the coating. The coating shall not be higher than the abrasive particles.
The coating is not allowed to peel or delaminate.
There shall be no burrs or rust spots on the product surface.
4.2.6The substrate surface of the non-abrasive layer shall have a protective decorative coating. 4.3 Dimensional deviation
The dimensional deviation of the product shall comply with the provisions of Table 3.
Diameter D
Thickness T
Mandrel diameter Y
Mandrel length L
5Test method
5.1 General requirements inspection
5.1.1 When the product is delivered for inspection, its construction documents shall be consistent with the product and its logo, and visual inspection shall be carried out according to general requirements. 5.1.2 The hardness of the substrate shall be checked with a hardness tester.
5.1.3 The coaxiality deviation shall be checked with a runout meter with a graduation value of 0.001mm. 24
JB/T 7991.4—2001
5.1.4 The surface roughness can be checked by comparing with a standard sample block. 5.2 Appearance inspection
The following items shall be checked with a reading microscope with a magnification of 20 times. 5.2.1 Uniformity of abrasive distribution
When the gaps between abrasive particles are less than the positions that five abrasive particles should occupy, it is considered uniform. 5.2.2 Abrasive bonding strength
Use a thin steel sheet with a hardness of ≥54HRC to scrape the working surface of the product back and forth five times, and observe the working surface of the product. If there are no pits, it is considered to be firmly bonded.
5.2.3 Nodules and coatings
Those with nodules and coating thickness lower than the abrasive particles are qualified. 5.2.4 Bonding strength of abrasive coating and substrate
Clamp the handle of the grinding head in a vise, and use a small flat-head carving knife to scrape the abrasive coating. If there is no layering, it is qualified. 5.2.5 Check burrs and rust spots with your eyes.
5.3 Size inspection
Use a vernier caliper with a graduation value of 0.02mm and a lever micrometer to check the size of the grinding head. 6 Inspection rules
6.1 Products must be inspected according to the technical requirements of this standard before leaving the factory. Only qualified products can leave the factory and attach a certificate of conformity. 6.2 100% inspection of appearance.
6.3 Other items shall be sampled and inspected in accordance with GB/T2828. 6.3.1 Sampling inspection shall adopt special inspection level S-1. 6.3.2 Sampling inspection shall adopt the normal inspection sampling plan of Table 3 of GB/T2828-1987. 6.3.3 The product quality level (AQL) is 2.5.7 Marking and packaging
7.1 Marking
7.1.1 Outer packaging marking
a) Manufacturer name, address, trademark
b) Product name and model;
c) Attach a certificate of conformity.
7.1.2 Certification Marks
a) Factory name, trademark;
b) Product name;
c) Product mark:
d) Inspection date;
e) Inspection stamp.
7.2 Packaging
7.2.1 Inner packaging: Packed with soft materials, products should be separated. 7.2.2 Outer packaging: Should be safe and reliable and comply with relevant transportation regulations. 7.2.3 Export products shall comply with contract requirements.
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