General inspection method for footwear -- abrasion test method

1 Subject content and scope of application this standard specifies the test method for wear resistance of finished sole and formed sole (piece) This standard is applicable to the inspection of wear resistance of finished sole and formed sole (piece) 2 Principle: the rotating grinding wheel is pressed vertically on the sample, and the wear test is carried out on the sample at a certain load, a certain speed and a certain time to measure the wear mark length of the sample 3 Sample 3.1 the finished shoes, sole or flat test piece (thickness ≥ 6mm) can be used as the sample 3.2 each group of samples shall not be less than four shoes, soles or pieces 3.3 sample pretreatment: remove the surface layer of the sample that affects the test results The surface of the sample shall be flat, and the sample shall be placed in the laboratory for more than 4 hours 4 Test equipment: 4.1 wear test machine shall meet the following conditions: 4.1.1 The grinding wheel is ∮ 20 ± 0.1 × 4 ± 0.1M m T12 steel grinding wheel, which has 72 teeth, the tooth angle is 90 ° ± 5 °, the tooth tip width is 0.2 ± 0.05mm, the tooth tip roughness Ra = 3.2 μ m, the hardness HRC ≥ 55, and the same axis degree is 0.03mm 4.1.2 the grinding wheel speed can be adjusted within the range of 100-300r / min 4.1.3 the grinding wheel shall rotate clockwise, operate stably, and the radial runout shall not be greater than 0.05mm 4.1.4 the load between grinding wheel and sample is adjustable within 19.6n 4.1.5 the grinding wheel shall be inspected once a year 4.1.6 the test time is automatically controlled with an accuracy of 0.1min 4.1.7 the measuring range of the balance is 2000g, and the accuracy is 5g 4.2 vernier caliper with graduation of 0.02mm 5 Test condition 5.1 load is 4.9n (special requirements can be selected within 19.6n) 5.2 the grinding wheel speed is 191 ± 5R / min (special requirements can be selected within the allowable range of the testing machine) 5.3 the test time is continuous 20min (special requirements can be selected separately) 5.4 the ambient temperature is room temperature 6 Test steps: 6.1 adjust all parts of the testing machine normally and run the grinding wheel idly for 20min 6.2 fasten the sample to the left end of the balance of the testing machine, with the sole facing up, and adjust the worn part of the sole to the horizontal 6.3 adjust the grinding position to align it with the flat part of the sample (with enough area for abrasion) The position of the grinding wheel shall be on the upper left of the pillar of the sample holder 6.4 balance both ends of the balance (zero pointer) Then add weight at the right end of the balance according to the load value required by the test conditions (for example, 500g weight should be added for the load of 4.9n) At this time, the contact load between the sample and the grinding wheel is the specified value 6.5 adjust the height position of grinding wheel to make the balance pointer point to zero, and then tighten the fastening handle of grinding wheel axle 6.6 set the start of time selection to the required value 6.7 start the machine, adjust the grinding wheel speed to the specified value, clear the time display at the same time, and officially start the test 6.8 after the tester stops automatically according to the specified time, measure the length of both sides of the wear mark with a caliper 6.9 in case of under sulfur sample found during the test, stop the test immediately Clean the contaminated grinding wheel with organic solvent 7 Test results: 7.1 the test results shall be expressed in mm of wear mark length, and the effective number shall be one decimal place 7.2 measure at least two parts of each sample, and take the arithmetic mean of four data in two parts If the wear mark is trapezoid, the long side shall not be greater than 10% of the short side 7.3 the big allowable deviation of Zui of each test data to the average value is ± 10% If there is more than one, it shall be retested 7.4 the test results of each sample are respectively expressed 8 Test report: 8.1 indicate to test according to this standard 8.2 sample number, name, specification, brand number, sole material, manufacturer or inspection unit and wearing part 8.3 sample pretreatment and conditions 8.4 test load, grinding wheel speed, abrasion time and laboratory temperature 8.5 test results 8.6 test personnel and date