JB/T 3584-1999 This standard is a revision of JB 3584-84 "Determination of the operating density of super abrasives". This standard is not equivalent to the American national standard ANSI B74.17-1976 "Testing method for the bulk density of diamond abrasive grains". For the convenience of calculation, the volume of the measuring cylinder is changed from 8mL to 10mL, and the specification size is changed from "English" to "Metric". Other technical contents remain unchanged. This standard specifies the instrument and measurement method for the bulk density of super abrasives. This standard is applicable to the bulk density determination of artificial diamond and cubic boron nitride with a particle size of 16/20~325/400. This standard was first issued in February 1984. JB/T 3584-1999 Determination of the bulk density of super abrasives JB/T3584-1999 Standard download decompression password: www.bzxz.net

ICS25.100.70
Standard of the Machinery Industry of the People's Republic of China
JB/T3584—1999
Superhard abrasives
Published on 1999-05-20
Determination method of bulk density
Implementation on 2000-01-01
National Bureau of Machinery Industry
JB/T3584—1999
This standard is a revision of JB3584-84 "Determination method of bulk density of superhard abrasives". This standard adopts the American national standard ANSIB74.17-1976 "Test method of bulk density of diamond abrasive grains" in a non-equivalent manner. For the convenience of calculation, the volume of the measuring cylinder is changed from 8mL to 10mL, and the specification size is changed from "imperial" to "metric". This standard is consistent with the technical content of JB3584-84, and has only been re-edited according to relevant regulations. This standard replaces JB358484 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: Zhengzhou Abrasives and Grinding Research Institute. The main drafter of this standard: Yuan Xingguo.
This standard was first issued in February 1984.
1 Scope
Mechanical Industry Standard of the People's Republic of China
Determination Method of Bulk Density of Superhard Abrasives
This standard specifies the instrument and measurement method for determining the bulk density of superhard abrasives. JB/T3584-1999
Replaces JB3584-84
This standard is applicable to the determination of bulk density of artificial diamond and cubic boron nitride with a particle size of 16/20~325/400. 2 Referenced Standards
The provisions contained in the following standards constitute the provisions of this standard through reference in this standard. When this standard was published, the versions shown were all valid. All standards are subject to revision. Parties using this standard should explore the possibility of using the latest version of the following standards. GB/T64061996 Superhard abrasives Diamond or cubic boron nitride particle size JB/T3914-1999
3 Definitions
Superhard abrasive sampling method
This standard adopts the following definitions.
3.1 Bulk density
Bulk density refers to the mass of abrasive particles contained in a unit volume in the air under the condition of natural accumulation of abrasive particles, and the unit is g/cm34 Method Summary
The method for determining the bulk density of superhard abrasives is to let the static-free dry abrasive particles flow out through a funnel without vibration, fill a 10mL volumetric cylinder through a fixed height, and scrape off the excess with a brass scraper to measure the mass per unit volume. 5 Experimental conditions
5.1 The experiment should be carried out under the following atmospheric conditions: Relative humidity: 45%~55%;
Temperature: 20~24℃.
5.2 Preparation of test sample: Take samples of the material to be tested that meets GB/T6406 according to the method specified in JB/T3914, reduce it to 25g ± 0.1g and put it into about 30mL of nickel-added glass, dry it in an oven at 110°C ± 5°C for 1 hour, take it out, and cool it in a desiccator for at least 4 hours to adapt it to the laboratory atmosphere and eliminate static electricity. 5.3 Prepare a sturdy and vibration-proof workbench, the tabletop should be level, and covered with a 5mm thick rubber sheet or soft plastic sheet. 6 Instruments
6.1JS72-1 Bulk Density Tester
As shown in Figure 1, the instrument consists of the following main components: Approved by the State Bureau of Machinery Industry on May 20, 1999 and implemented on January 1, 2000
6.1.1 Funnel
Material: Brass
JB/T3584-1999
1-Collection plate: 2-Measuring cylinder: 3 Rubber ball: 4 Spring: 5 Funnel: 6 Funnel stand: 7 Funnel support rod: 8 Base: 9 Base stand Figure 1JS Schematic diagram of 72-1 type bulk density tester Inner diameter of funnel top: 57.1mm±0.01mm Cone height: 41.3mmbzxz.net
Derived cone angle: 63°±10
Inner diameter of funnel neck: 6.4mm±0.03mm
Length of funnel neck: 6.4mm±0.03mm
6.1.2 Funnel locking device
A rubber ball with a diameter of 19mm is fixed at the lower end of the funnel neck with two springs, and no particles are allowed to leak. 6.1.3 The distance from the lower end of the funnel neck to the measuring tube mouth is 61.9mm±0.1mm. 6.1.4 Measuring tube
Material: brass
Inner diameter: 19.3mm±0.01mm
Inner depth: 34.2mm±0.02mm
Volume: about 10mL
6.1.5 Scraper
Material: brass
JB/T3584-1999
The edges and corners of the scraper working surface should be flat, and its straightness should be less than 0.1mm per millimeter length. See Figure 2.0
6.2 Balance
Weighing 100g, sensitivity 0.001g.
7 Calibration of the volume of the measuring cylinder
Figure 2 Schematic diagram of the scraper
The volume of any new or long-used measuring cylinder should be calibrated. The calibration method is as follows: 7.1 Weigh the dry empty measuring cylinder together with a glass plate slightly larger than 24mmx24mm, and then cover the glass plate on the measuring cylinder with a small opening. Use a burette to drip distilled water at a temperature of 24℃±0.1℃ into the measuring cylinder at a rate of 5mL per minute. When it is almost full, tilt the measuring cylinder slightly to discharge the bubbles under the glass plate until the measuring cylinder is full. Move the glass plate smoothly, cover the mouth of the measuring cylinder, and wipe off the excess water. Weigh its total weight on an analytical balance (sensitivity is 0.0001g). Take the average of the three measurements as the volume of the measuring cylinder. 7.2 The volume of the measuring cylinder is calculated according to formula (1): KW
W The net weight of water, g:
The density of distilled water at -24℃±0.1℃ is 0.9972g/cm2. p
8 Determination method
8.1 Before determination, calibrate the horizontality of the JS72-1 bulk density tester. (1)
8.2 Before each measurement, clean the funnel carefully, close the rubber ball valve at the discharge port, clean the measuring cylinder and the collecting plate, and place them on the positioning pins.
8.3 Pour the sample prepared according to 5.2 into the glass feeder. When adding material, first add along the wall of the funnel, then move to the center, and slowly flow into the funnel without the feeder leaving the material pile. Make it spread evenly from the center to the surroundings and naturally accumulate into a cone. 8.4 Quickly open the rubber ball valve and allow the sample to fall freely to fill the measuring cylinder. Gently support the measuring cylinder with one hand, and immediately use the edge of the scraper to close to the edge of the measuring cylinder mouth with the other hand, and scrape off the excess sample at an angle of 5 to 10 in the direction shown in Figure 3. When scraping, be careful to avoid vibration, impact or other interference factors from beginning to end. Then gently tap the wall of the measuring cylinder to reduce the volume of the sample, and use a paintbrush to remove the scattered particles on the outside and bottom of the measuring cylinder.
8.5 Weigh the sample in the measuring cylinder on the balance specified in 6.2. Accurate to 0.01g. 3
Take the average of three measurements as the result.
9Calculation
The bulk density is calculated according to formula (2):
JB/T3584-1999
Auxiliary material abrasive
Material preparation
Two quantities
Schematic diagram of scraping direction
Where: D is the bulk density of the abrasive, g/cm3; the weight of the abrasive in the measuring cylinder, g:
- the volume of the measuring cylinder, cm.
10 Allowable Deviation
For samples with a particle size of 16/20~325/400, the allowable deviation of the bulk density values ​​measured three times should not be greater than 0.015g/am2. 4
Mechanical Industry Standard
Determination Method of Bulk Density of Superhard Abrasives
JB/T3584-1999
Published and distributed 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)*
Book Size 880×1230
Sheet 1/2
Number of Words 10000
First Edition in September 1999
First Printing in September 1999
Number of Prints 1-500
Price 500 Yuan
99-561
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