Still in 2013, many Vickers hardness testers are also updated and replaced with other series of hardness testers. In the past, we have summarized common technical knowledge about Rockwell hardness testers. Today, Fangfang Xiaobian will summarize the latest ones for you. Common technical knowledge of Vickers hardness testers, for reference only.
First, the Vickers hardness tester zero adjustment: hardness test zero adjustment, there is memory function. It is only necessary to reset the zero position after the power is turned on again. The operator replaces it, please reset it again to ensure accurate measurement. Rotate the left and right wheel hubs so that the inner edges of the two lines are infinitely close, and the light-transmissive slits between the two lines are gradually reduced, tending to be in a critical state without a light gap, and pressing the CLR key to set zero.
Second, the Vickers hardness tester diamond cone head requirements: 1, Vickers hardness tester diamond angle cone indented angle between the two opposite faces is 136? ± 30'; 2, Vickers hardness tester diamond pyramid The top edge of the indenter is no more than 2 microns; 3. The surface of the indenter pyramid is within 0.3 mm from the top. When the magnification is 50 times, defects such as cracks, blisters, chipping and scratches should not be seen, and the surface finish. Should not be lower than 12; 4, Vickers hardness tester diamond cone axis and the pressure head stem axis should coincide, the deviation should not be greater than 0.03 mm, the skewness should not be greater than 30'.
Third, Vickers hardness tester requirements: 1, the test surface of the sample must be smooth surface, no oxides and foreign dirt, the surface roughness of the test surface must ensure accurate measurement of the diagonal of the indentation, Generally Ra should not be greater than 0.2 microns. 2. During the preparation of the sample; the influence of cold and hot processing on the surface of the sample should be avoided as much as possible. 3. The thickness of the sample or test layer shall be at least 1.5 times the average length of the diagonal of the indentation. The appropriate test force shall be selected during the test.
4. Correct measurement of the Vickers hardness tester: observe the rotating left line positioning wheel through the eye hinge, and move the left line of the micrometer eyepiece so that the left line is just cut on the left corner of the diagonal of the indentation, and Rotate the measuring wheel vertically so that the right moving line is just tangent. Press the micro-input button on the right corner of the indentation diagonal line. The LCD screen displays the value of D1 and waits for the D2 value to be input. Rotate the micrometer to the distance between the observation line and the indentation angle, and then turn the left line to position the wheel so that the fixed positioning line is perpendicular to the diagonal and tangent. Turn the measuring wheel so that the lower moving line is just in the lower right corner of the indentation. Press the input button on the micrometer and the data is entered into the hardness tester to display the hardness value. If you are not satisfied with the test, you can re-enter the next test.
5. Difference between Vickers hardness tester and micro Vickers hardness tester:
A Vickers hardness tester is a hardness tester for measuring the Vickers hardness value of a material. The Vickers hardness test is divided into three forms depending on the range of test forces. The test force F ≥ 49.03N or ≥ HV5 is a Vickers hardness tester. The test force is 1.961N ≤ F < 49.03N or HV0.2 ~ < HV5 is a small load Vickers hardness tester. The test force 0.09807N ≤ F < 1.96N or HV 0.01 ~ HV0.2 is a micro Vickers hardness tester. A low load Vickers hardness tester measures the hardness of a material with a small load Vickers hardness value. Microhardness tester A durometer that measures the Vickers hardness values ​​and Knoop hardness values ​​of materials.
Sixth, Vickers hardness tester in the working state of the machine Note: Vickers hardness tester can not move the test piece when the motor is in working condition, must wait for the end of this unloading to move, otherwise it will damage the instrument.
7. Vickers hardness tester for detecting irregular workpieces: When testing irregular test pieces with Vickers hardness tester, be careful during operation to prevent the pressure head from hitting the test piece and damaging the press head.
8. How to calibrate the Vickers hardness tester before use: 1. The calibration of the Vickers hardness tester before use is generally a measurement standard block. When the value of the measured value and the standard hardness block are different, it is generally within the error range. . 2. The Vickers hardness tester certificate is generally issued by the metrology department and is authoritative. 3. In fact, if you do not want to measure the verification certificate, you can play the standard block yourself.
Nine, the Vickers hardness tester spindle and the work surface is not perpendicular to the inspection: the test rod is firmly mounted on the main shaft, with a square and feeler gauge in two directions perpendicular to each other. Then remove the check rod, reinstall it, and measure again. The maximum value of the measured results should not exceed the specified.
Ten, Vickers hardness tester lifting shaft elastic adjustment method: adjust the left and right ends of the lifting shaft sleeve screws, rotate the hand wheel to make the lifting shaft, free movement up and down, no clamping phenomenon, to meet the appropriate requirements for lifting and loosening.
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