What are the test methods of the steel bar bending test machine
What are the test methods of the steel bar bending test machine
Regarding the test method of the steel bar bending test machine, the following test machine will give a brief introduction to the test method of the steel bar bending test machine. I hope it can help you! Selection of the test: 1. General requirements: A. Straightening: For the sample made from the coil, simple bending and straightening should be carried out before any test, and the smallest plastic deformation should be ensured. B. Artificial aging: when determining the performance indexes of tensile test and fatigue test, artificial aging of the sample can be carried out as needed (for the sample that needs to be straightened, artificial aging should be carried out after straightening). When the product standard does not specify the artificial aging process, the following process conditions can be used: heating the sample to 100°C, holding it at 100°C ± 10°C for 60 min to 75 min, and then naturally cooling to room temperature in still air. When artificially aging the sample, the aging process conditions should be recorded in the test report. 2. The parallel length of the sample should be long enough to meet the requirements for elongation determination. 3. When measuring the elongation (A) after breaking, the sample should be marked with the original gauge length L according to GB/T 228.1. 4. When measuring the total elongation of force Fm (Ag,) by manual method, the equal division mark should be marked on the parallel length of the sample. According to the diameter of the steel product, the distance between the equal division marks should be 10 mm. 5 mm or 20 mm can also be used as required. Selection of test equipment: 1. Chenda GW40/50 steel bending test machine, which is calibrated and calibrated according to the national standard. 2. The bending test can also be done by using a test device with two supporting rollers and a bending core. . 3. The extension gauge used to measure the force and total elongation should have a gauge length of at least 100mm, which should be recorded in the test procedure: 1. Unless otherwise specified, the bending test should be at a temperature of 10℃~35℃ Proceed under. Note: For the test at low temperature, if the test conditions are not specified in the agreement, a temperature deviation of ±2°C should be used. The sample should be immersed in the cooling medium and kept for sufficient time to ensure that the entire sample reaches the specified temperature (for example, at least 10 min for liquid medium and at least 30 min for gas medium). The bending test should be carried out when the sample is removed from the medium 55. Moving the sample should ensure that the temperature of the sample is within the allowable temperature range. 2. The sample should be bent on the bent core. 3. The bending angle (T) and bending core diameter (D) should comply with relevant product standards. Judgment of test results: The bending test shall be determined according to the relevant product standards. When the product standard does not stipulate, if there is no visible crack in the bent sample, the sample is judged to be qualified.
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