JB/T 9877-1999 Determination of cleanliness of metal cutting machine tools
Some standard content:
rC.S25.080
Mechanical Industry Standard of the People's Republic of China
JB/T9877-1999
Metal Cutting Machine Tools
Published on 1999-05-20
Determination of Cleanliness
2000-01-01 Implementation
National Bureau of Machinery Industry
JB/79877-1999
This standard is the revision of ZBJ50003-88 Metal Cutting Machine Cleanliness Determination, the original version is not found, it is formulated based on the production experience of machine tool products in my country for many years and the use requirements of the final product. Its technical requirements still need to meet the current scientific and technological level and adapt to the production and use requirements.
This standard is consistent with the technical requirements of ZBJ50003-88, and only the relevant provisions are re-edited. This standard will replace ZR15D003-BB from the date of implementation. Appendix A and Appendix B of this standard are all correct. The standard is proposed by the National Metal Cutting Machine Tool Standardization Technical Committee, and this standard is under the jurisdiction of the National Metal Cutting Machine Tool Standardization Technical Committee. This standard was drafted by Beijing Machinery Research Institute. This standard was first issued in July 1988. 1 Scope
Machinery Industry Standard of the People's Republic of China
Determination of Cleanliness of Metal Cutting Machine Tools
IB0877-1999
2 [5J56003-88
This standard specifies the inspection requirements and methods for the cleanliness of metal cutting machine tools (hereinafter referred to as machine tools). All types of machine tools should be supplemented and integrated in their respective technical service standards according to the provisions of this standard. This standard is applicable to the inspection of the cleanliness of finished products of metal cutting machine tools and the cleaning process during assembly. This standard only specifies the visual adjustment, feel method and weight method. When the particle counting method is used, the provisions of relevant standards shall be followed. 2 Referenced Standards
The following standards contain the following conditions: The provisions of this standard that are cited in this standard are valid at the time of publication of this standard. All standards are subject to revision. Parties using this standard should explore the possibility of using the latest versions of the following standards. 922-8 Solvent pool
3 Definitions
This standard adopts the following definitions.
3. Cleanliness
The degree of dirt (such as gold shavings, gold urn, sand, dust, cotton and fur, etc.) contained in the test object. 3.2 Cleanliness limit limofclcnlincas The maximum value of dirt contained in the test object. 4 Inspection list and requirements
4.1.1 The inner and outer surfaces and grooves of the parts (such as bearings, spindles and screws, etc.) and a The mating surfaces and working surfaces of general parts should not have any stains.
Check by visual inspection and feel.
4.1.2 Castings and samples (such as bed, vertical machine, worktable, spindle box and filter box, etc.) should not have obvious dirt on the inner and outer surfaces, holes and grooves and the bottom layer.
Check by visual inspection and feel.
4.2 Mechanical transmission system
d.2.1 Lubrication Circulation lubrication transmission system Such systems (such as spindle boxes, feed boxes and gearboxes, etc.) should determine the cleanliness limit according to their precision, life and reliability requirements, and make a comparison in the machine tool technical requirements: Regularly reverse inspection by weight. Check by visual inspection and feel during normal assembly. 4.2.2 Non-circulating transmission system
Approved by the National Bureau of Machinery Industry on May 20, 1999, and implemented on January 1, 2000
JB/T9877—1999
This type of system refers to the transmission system that is lubricated by tires or lubricated by non-circulating lubricants, such as threaded pairs, weak wheel pairs, etc.) The inspection method shall be clearly specified in the technical requirements of machine tools according to the requirements of their end density, life and reliability. When the weight method is used, the standard limit value shall be given; when the visual inspection and hand feeling method are used, the fast-moving parts shall not be dirty. 4.3 Hydraulic system
The hydraulic system of each type of machine tool shall be based on the requirements of life and reliability. The cleanliness limit of the system pipeline or oil tank shall be determined statically, and specified in the technical requirements of machine tools.
The shaft shall be checked regularly by the weight plate method or the particle counting method. In the normal assembly process, the visual inspection and hand feeling method shall be used for inspection. 4.4 Electrical system
The inner wall of the electric cabinet and control station and the electrical components and devices should not have dust, rust, oil and other dirt, and the inside should not contain metal wire ends, screws, pads and cotton threads.
Inspect by visual inspection and hand feeling.
4.5 Joints of the guide surfaces
These parts and oil plugs and oil carriers should be clearly specified in the technical requirements of the machine tool according to their precision, life and reliability requirements:
When the heavy disk method is used, the cleanliness limit should be given; when visual inspection and hand method are used, there should be no dirt. 5 Selection of test methods
.[Basic water requirements
5.L.1 When testing cleanliness, the environment should be clean, and its cleanliness should be consistent with the requirements of the test. 5.1. When testing cleanliness, the clothes, hats and hands of the inspectors should be clean. 5.1.3 The instruments used for testing cleanliness should be clean. 5.1.4 Visual inspection. Touch method
Visual inspection, touch method refers to the method of evaluating the cleanliness of the test object by visual and physical touch. 5.3 Weight method
Direct measurement method refers to the method of evaluating the cleanliness of the test object by measuring the weight of the dirt contained in the test object. The test generally includes the steps of collecting, testing, drying and weighing. 3.1 Collecting dirt
5.3.1.1 Cleaning the dirty
Clean the hand parts or mechanical transmission system of the machine tool with the determined cleaning liquid, and collect all dirty hooks and the cleaning liquid with dirt. 5.3.1.1.1 Cleaning liquid
The cleaning liquid should be filtered using a filter with high decontamination capacity and should be filtered before use. The pore size of the filter used should be smaller than the pore size of the filter membrane used to filter the dirty liquid. Generally, NY-120 solvent oil specified in GB/T1922 should be used: 5.3.1.1.2 Cleaning tools and devices
When cleaning, the following tools and devices are generally used: a) nylon brushes, paintbrushes, fine cloths, magnets and crabs, etc.: b) syringes, oil guns, flushing devices, etc.; c) porcelain or plastic plates, cans and barrels with vegetables, etc. 2
5.3.1.1.3 Cleaning requirements
When cleaning, the following requirements should be met:
JE/T9877—1999
3) Before cleaning, add a certain amount of lubricating oil to the transmission system to make it operate properly and lubricate the entire system; h) Use brushing, flushing and other methods to clean the test object; ) Dirt from non-sampling areas should not enter the washing area of the vehicle, and the loss of disinfectant should be prevented. S.3.1.1 Sampling to collect the dirt thoroughly
For the hydraulic system of the machine tool, use the sampling device to take the filtered oil from the pipeline oil of the system (one stream is not less than 1 meter). Before sampling, the pressure system should be run for a long time (one stream is not less than 20 meters) to make the dirt suspended in the hydraulic oil. 5.3.2 Filtration
5.3.2.1 Filters and devices wwW.bzxz.Net
Filter tools: filter membrane, funnel, disk, vacuum filter, etc. Filter equipment: Microporous filter device as shown in Figure 1. 1-Leakage: 2-Concentration membrane: \-Filter membrane support: 4-Sliding bucket seat: 5-Oil-resistant rubber plug: 6-Suction bottle: 7.-Golden figure 1
5 .3.2.2 Filtration requirements
The following requirements must be met:
) The filter element (filter membrane, filter screen) should be weighed according to the provisions of Appendix A (Appendix to the standard) before use; b) The pore size of the filter membrane should be determined according to the precision requirements of the object to be tested, but the maximum value should not exceed 5um;) After filtration, all dirt should be transferred to the filter element; d) Vacuum filtration method should be used, and the vacuum degree of the vacuum filtration system shall not be greater than 80kPa; e) When there is too much filter material, the coarse filtration and sample filtration methods specified in Appendix 2 (Appendix to the standard) can be used; when there is grease in the filter, it should be filtered after degreasing; ) The lubricating oil after operation should be filtered. 5.3.3 Weighing 5.3.3.1 Ship equipment a) Weighing bottles, desiccators: b) Analytical balance; c) Drying oven. 5.3.3.2 Drying The following requirements shall be met during drying: 1R/T98TT-1999 The filter membranes with dirt on them shall be placed in weighing bottles for drying. The drying temperature of the filter membrane shall be 9±5°C, and the drying temperature of the filter membrane shall be 0.5°C. The time shall be not less than 10000 mm/s. After the weighing bottles are taken out of the oven, they shall be placed in a desiccator for cooling. The cooling time shall be not less than 30 min. 5.3.4 Calculation
When the sample is collected by elimination method and filtered through the whole liquid, the weight of the substance contained in the test object shall be calculated according to formula (1); When the sample is collected by sampling method, the weight of the substance contained in the unit volume of the extracted liquid shall be calculated according to formula (2).(r)
Where: m
Reconstruction of dirt contained in the inspection object, m:
Weight of dirt in unit volume of the extracted liquid, mg/, weight of a clean weighing bottle and filter membrane, mg: weight of weighing bottle and filter membrane with dirt, mV:: volume of extracted liquid, ml..
JE/T9877-1999
【Standard attachment】
Constant measurement of speed element
A1 Wash both sides of the filter element in a clean cleaning liquid. A2 Put the washed filter element into a weighing box with a mark or number. A3 Put the weighing bottle with filter membrane into an oven at 90℃±5℃, put the weighing pan with filter screen into an oven at 105%15, and open the bottle and the box slightly. The drying time is 60min. 44 Put the bottle cap on the scale. Take it out of the oven, dry it for 30 minutes, and then weigh it. A5 Repeat the drying according to the methods of A3 and A4, and weigh it until the difference between the two weight readings is no more than the specified value [usually 0.4 mA A6 Install the filter element number and record the weight value. B1 Coarse filtration
JR/T9877-1999
"Appendix to the standard
Coarse filtration and sampling method
Use a gold filter with a hole size of 0.036mm (400mm) to filter all the filter media with dirt, and measure the volume of all the obtained media in detail.
B2 Sampling filtration||tt ||BZ.1 Stirring
Place a slinger in the dirty part of the container containing all the liquid after filtration, and make it deviate from the center by a certain distance. The speed should be limited to prevent the liquid from leaking out. The stirring time is about 1 hour. B2.2 Sampling
Take half of the liquid when the machine is stopped, and measure its volume. B2.3 Filtration
Perform according to the provisions of 5.3.2 of this standard.
B3 Drying and weighing
Dry the filter membrane and filter with dirt according to the provisions of 5.3.3 of this standard, and weigh them. B4 Calculation of the amount of dirt contained in the inspection object is calculated according to the formula (BI=(m+ mH (mr m,)
The weight of the dirt contained in the inspection object, mg:
Where: m--the weight of the clean weighing bottle and filter screen, Tg; m--the weight of the weighing bottle and filter screen with dirt, mg:m--the weight of the clean weighing bottle and filter screen. mg: the weight of the weighing bottle and filter screen with dirt, m+m
V--the volume of the total liquid after filtering, mL
V--the extracted liquid volume, L.
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