JB/T 7898-1999 This standard is a revision of JB/T 7898-95 "Filled polytetrafluoroethylene guide rail soft tape". This standard specifies the technical requirements, inspection rules, packaging, marking and storage of filled polytetrafluoroethylene guide rail soft tape. This standard is applicable to metal cutting machine tools, instruments and other mechanical guide rail soft tapes with a thickness of 0.3~3.2mm that require friction reduction, wear resistance and anti-climbing. This standard was first issued in 1989 as GB 10904-89 and was adjusted to JB/T 7898-95 on April 14, 1996. JB/T 7898-1999 Filled polytetrafluoroethylene guide rail soft tape JB/T7898-1999 standard download decompression password: www.bzxz.net

ICS 83.140.99
Standard of the Machinery Industry of the People's Republic of China
JB/T7898-1999
Filled polytetrafluoroethylene slideway soft strips
Filled polytetrafluoroethylene slideway soft stripsPublished on 1999-06-24
State Bureau of Machinery Industry
Implemented on 2000-01-01
JB/T7898-1999
This standard is a revision of JB/T7898-95 "Filled polytetrafluoroethylene slideway soft strips". During the revision, only editorial changes were made according to relevant regulations, and the main technical content remained unchanged. This standard replaces JB/T7898-95 from the date of implementation. Appendix A of this standard is the appendix of the standard.
This standard is proposed and managed by the Machinery Industry Plastic Products Branch of the National Plastic Standardization Technical Committee. The responsible drafting units of this standard are Guangzhou Machine Tool Research Institute and Beijing Machine Tool Research Institute. The main drafters of this standard are Xie Haijian, Hu Guoming, Huang Guodian and Zhou Jingtian. 1 Scope
Machinery Industry Standard of the People's Republic of China
Filled polytetrafluoroethylene slideway soft strips
Filled polytetrafluoroethylene slideway soft stripsJB/T7898-1999
Replaces JB/T7898-95
This standard specifies the technical requirements, inspection regulations, packaging, marking and storage of filled polytetrafluoroethylene slideway soft strips (hereinafter referred to as soft strips).
This standard is applicable to soft strips for metal cutting machine tools, instruments and other mechanical guideways with a thickness of 0.3~3.2mm that require storage reduction, anti-deer and anti-spot.
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 and parties using this standard should investigate the possibility of using the most recent versions of the following standards. GB/T 1040—1992
GB/T 1041—1992
GB/T 3398—1982
GB/T 39601983
HG/T 48531981
HG/T4-854—1981
3 Technical requirements
3.1 Appearance of soft belt
Test method for tensile properties of materials
Test method for compression properties of plastics
Test method for indentation hardness of plastics
Test method for sliding friction and wear of plastics
Determination method for shear strength of bond between vulcanized rubber and metal Determination method for shaving strength of bond between vulcanized rubber and gold chips 3.1.1 The soft belt should have a smooth surface, uniform color, and no obvious scratches or other defects. 3.1.2 The edge of the soft belt should be straight, and the bowstring height of 1m length should not exceed 3mm; for every 1m increase in the length of the soft belt, the increase in the full-length bowstring height should not exceed 2mm.
3.2 Soft belt size deviation
The limit deviation of the soft belt thickness and width is shown in Table 1 and Table 2. Table 1
Reporting limit deviation
Approved by the State Machinery Industry Bureau on June 24, 1999 0.61.0
Implemented on January 1, 2000
Limit deviation
Soft belt mechanical properties and test methods
JB/T7898—1999
The mechanical properties of the soft belt material should meet the indicators in Table 3. Table 3
Ball indentation hardness
Tensile strength
25% constant strain compressive stress
The friction and wear properties of the soft belt should meet the indicators in Table 4. 3.3.2
70~100
mm/(N·m)
Dynamic friction coefficient (lubricated with No. 30 engine oil)
Wear rate
<1×10
The soft tape bonding performance shall meet the indicators in Table 5. Item
Shear strength between soft tape and cast iron
Residual strength at 180° between soft tape and cast iron
Inspection rules
The appearance quality of the soft tape shall be observed with the naked eye under normal light. Standard
Test method
GB/T 3398
GB/T1040
GB/T1041
Test method
GB/T3960
Appendix A (Appendix to the standard)
Test method
HG/T 4853
HG/T 4854
2 The thickness of the soft belt is measured with a gauge with an accuracy of not less than 0.01mm: the width is measured with a steel ruler with millimeter scale. 4. 2
4.3 The appearance and size of the soft belt must be inspected piece by piece. The soft belt is unfolded on the platform to measure the bowstring height. The soft belt performance test is carried out in batches. Products produced continuously with the same process and the same batch of raw materials are considered a batch. 4.4
5 Packaging, marking and storage
JB/T7898-1999
5.1 The soft tape is packed in rolls with kraft paper or plastic bags. Each bag should be attached with a label indicating: manufacturer name, product name, specifications, quality, batch number and production date, and then placed in a carton or wooden box. 5.2 The soft tape should be accompanied by an instruction manual and a certificate of conformity when leaving the factory. 5.3 The soft tape should be stored in a cool and dry place in a packaged state. 5.4 The soft tape should avoid damaging the surface treatment layer during transportation or use. JB/T7898-1999
Appendix A
(Standard Appendix)
Wear rate determination method
This method allows the sample and the wear piece to slide back and forth relative to each other in a surface contact manner. Under a certain load, the normal line wear of the sample is measured after a specified stroke to calculate the wear rate. A1 Test equipment
A1.1 It is a reciprocating plane wear tester, and its working principle is shown in Figure A1: 1 Sample substrate: 2 Adhesive layer: 3 A soft belt: 4 A pair of corrosive parts Figure A1
A1.2 The transmission system is used to make the wear parts reciprocate smoothly and slide relative to the sample. A1.3 The loading system can apply a normal load to the sample, with an accuracy of less than 5%. A1.4 The lubrication device enables the sample to obtain the required lubrication during the test. The oil supply should be adjustable. A1.5 The interlayer can clamp the sample and ensure that the friction surface has good contact. A1.6 A counter or timer for recording the stroke, with an accuracy of less than 1%. A2 Sample and counter
The sample is shown in Figure A2. The substrate material is cast iron HT250, and the friction surface is bonded with a soft belt. Cross
1 Sample substrate: 2-rubber layer; 3-soft belt
(r=10~40mm; b=12-20mm; h=10~30mm) Figure A2
A2.2 The size of the wear piece should ensure that the sample is always in full contact during the reciprocating stroke. The material is casting HT200, and the friction surface roughness R, 0.4μm. www.bzxz.net
A3 Test conditions
JB/T 7898—1999
A3.1 The two relative sliding surfaces of the wear piece and the sample should have good contact. A3.2 The sample is in a static state, and the wear piece reciprocates at an average speed of 8~16m/min. A3.3 Sliding stroke 120~200mm.
A3.4 The total sliding stroke is not less than 100km.
Contact pressure 1MPa.
A3.6 The test environment temperature is room temperature.
Use No. 30 engine oil to lubricate the friction pair, and supply oil automatically or manually. Test steps
Wipe the sample clean with acetone, install it in the fixture, and fix it. Adjust the speed and stroke according to A3.2 and A3.3. A4.23
Load according to the requirements of A3.5.
Start the test machine and add lubricating oil.
After the 10km running-in test, stop the machine, remove the sample, wipe it clean and place it on the measuring platform. After standing for 4 hours, use a measuring tool accurate to 1.0μmA4.5
to measure the normal dimension of the sample, which is the original normal linear dimension of the sample. Reinstall the sample on the test machine and continue the test according to the requirements of A4.2, A4.3, and A4.4. A4.62
After reaching the total stroke required for the test, measure the normal linear dimension of the specimen according to A4.5. The difference between the obtained dimension and the dimension measured in A4.5 is A4.7
Normal line wear:
A5Test result calculation
The wear rate is calculated according to formula (AI):
Where: K—wear rate, mm/(Nm)
Volume wear, mm:
P—load, N:
V-average sliding speed, m/min;
fRunning time, min.
A5.2 Test results: Each group of samples shall have no less than two, and the arithmetic mean value (three significant figures) shall be taken. (AI)
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