1、 Operation process
1. Environment and Sample Preparation
Before testing, the sample should be equilibrated in a standard environment (23 ± 2 ℃, 50 ± 5% humidity) for at least 4 hours to remove surface oil stains and impurities;
When fixing the sample, it is necessary to ensure that there are no wrinkles or bubbles to avoid distortion of the test data.
2. Instrument calibration and parameter setting
After starting up, use standard weights to calibrate the force sensor and verify the zero offset (if the pointer does not return to zero, adjust the nut for calibration);
Set parameters according to testing standards (such as ASTM D1894, ISO 8295): sliding distance 126 ± 1mm, test speed 100/150mm/min, slider mass 200g (customizable).
3. Test execution
Static friction coefficient: Record the maximum resistance peak when the slider starts sliding;
Dynamic friction coefficient: Take the average resistance value during the sliding process;
Each group of samples should be tested at least 5 times, and outliers with a deviation greater than 3 units (such as swing fluctuation greater than 3BPN) should be removed. The average value should be calculated.
4. Data recording
Real time recording of temperature, humidity, and friction coefficient curves, with coefficient of variation (CV value)>10% requiring retesting.
2、 Maintenance and upkeep procedures
1. Daily maintenance
Immediately clean the tabletop and slider rubber sheet after testing, as any residue will accelerate wear and tear;
Non painted metal parts should be wiped with cotton yarn dipped in engine oil to prevent rust.
2. Key component protection
Sensor protection: Avoid collision or overload, handle with care when replacing the sample;
Rubber sheet replacement: Replace immediately when the worn long side is greater than 3.2mm or the short side is greater than 1.6mm;
Demagnetization treatment: Regularly check the residual magnetism of the test bench to prevent data drift caused by electromagnetic interference.
3. Regular calibration and maintenance
Calibrate the instrument accuracy with standard friction blocks every quarter and verify the load range (0-5N ± 0.5%);
Inject lubricating oil (such as lithium grease) into the rotating parts every six months to maintain the flexibility of the transmission system;
When idle for a long time, power off to prevent moisture and cover with a dust cover.
3、 Precautions
1. When calibrating the sliding length, the rubber sheet should "lightly touch the road surface" instead of sliding to avoid the calibration value being too large;
2. Exceeding the standard of environmental temperature and humidity will result in a data deviation of>5%, and the test needs to be terminated.