JB/T 9878-1999 This standard is a revision of ZB J50 005-88 "Determination of dust concentration in metal cutting machine tools". During the revision, only editorial changes were made according to relevant regulations, and the main technical content remained unchanged. This standard specifies the filter membrane measurement method for the production dust concentration of metal cutting machine tools. This standard is applicable to metal cutting machines that often generate production dust. This standard was first issued in March 1978 and first revised in March 1988. JB/T 9878-1999 Determination of dust concentration in metal cutting machine tools JB/T9878-1999 standard download decompression password: www.bzxz.net

ICS25.080
Machinery Industry Standard of the People's Republic of China
JB/T9878-1999Www.bzxZ.net
Metal Cutting Machine Tools
1999-05-20 Release
Determination of Dust Concentration
2000-01-01 Implementation
National Bureau of Machinery Industry
JB/T9878-1999
4 Standard is a revision of 7J50005-88 Determination of Dust Concentration of Metal Cutting Machine Tools. The original version was formulated by referring to relevant standards, through research and testing, and combined with the use characteristics of machine tool products. Its technical content still meets the current scientific and technological level and is suitable for production and use.
This standard is consistent with the technical content of 7B150005-BB, and has only been revised according to relevant regulations. This standard replaces 2BJ50005--88 from the date of implementation. Appendix A of this standard is a suggestive appendix.
The standard was issued by the National Technical Committee for Standardization of Metal Cutting Machine Tools. This standard was issued by the National Technical Committee for Standardization of Metal Cutting Machine Tools. The responsible drafting unit of this standard is: Beijing Machine Tool Research Institute. This standard was first issued in March 1978 and revised for the first time in September 1988. Scope
Machinery Industry Standard of the People's Republic of China
Determination of Dust Concentration of Metal Cutting Machine Tools
JB/T9878-1999
Generation 211350005-8K
This standard specifies the measurement method of the filter membrane of the productive dust of metal cutting machine tools (hereinafter referred to as machine tools). This standard is applicable to machines that generate productive dust. Measuring parts
2. When measuring the dust concentration of a machine tool, other machine tools around it that generate dust should be stopped. 2.2 The measurement of the dust concentration of a machine tool should be carried out after 30 minutes of operation under the specified conditions specified in the design. Machine tools with dust collectors and dust collectors should be in working condition. 3 Measurement method
3.1 The sampling head should face the dust source that generates dust on the machine tool and be kept halfway parallel to the horizontal plane. 3.2 The height of the sampling head from the ground is 1500mm. 3.3 The sampling head should be placed at a position where workers often work, 500mm away from the dust source. When it is not possible to measure at the 500mm position, the sampling head should be placed as close to the dust source as possible. When the machine tool is in the operating position, each operating position should be measured, and the maximum value should be taken as the dust concentration value of the machine tool. 3. 3. The air flow rate during sampling should be 15~50L/m3.6 After sampling, the dust collected on the filter should be weighed to 1~10mg, and the weighing should be carried out on a precision balance of one ten-thousandth: 4 Digital processing
Machine tool dust concentration value recommended formula (1) calculation: 1000(Mf2 - M)
In the formula: A—dust concentration value, mg/m\; M—filter weight before sampling, mg:
M—filter weight after sampling, mg;
g Deep sampling air flow rate, L/m:
Sampling time, blood in.
National Machinery Industry Bureau 1999-05-20 approved gr
20n0-01-01 Actual speed
Machine tool manufacturing name
Machine tool name
Tool management machine
Measurement equipment diagram
Before sample
Weight of film
JB/T9878-1999
Resistance recording A
(Appendix of reminder)
Machine tool dust concentration measurement record form
Alliance No. and specification
Building No.
Grinding wheel speed
Working speed
Cutting depth
Workpiece material
Sampling size
Measuring instrument
Name and model
After sampling
Sampling shaft air
Sampling time
Dust concentration value
Moving maximum specification
(words)
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