1. The effect of elastic deformation of Rockwell hardness tester on hardness value: The influence of elastic deformation of Rockwell hardness tester on hardness value can reach 0.5HR, so we must pay attention to the rigidity of the frame. The same amount, the lifting screw should have higher processing precision, can be embedded into its guiding device by its own weight, without obvious clearance, to reduce its axial displacement and improve the test accuracy.
2. Placement of the sample during the test of Rockwell hardness: It must be ensured that the applied force is perpendicular to the test surface. For curved shapes and other irregularly shaped specimens, a special type of dedicated operating table must be used and the correct test device selected. For cylindrical specimens, a “V†type operating table must be used.
3, the stability of the Rockwell hardness test: Rockwell hardness tester should not adjust its measurement lever often, should maintain its stability. One or two sets of better standard hardness blocks can be used to test regularly on the same hardness block to examine the long-term stability of the instrument and to grasp its performance. Before the hardness test, a standard hardness block machine close to the hardness value of the sample is applied to make the test result more reliable.
4, Rockwell hardness tester loading speed on the hardness value: loading speed on the hardness value: when the Rockwell hardness tester main load application speed from 2 seconds to 12 seconds on the hardness value, low hardness value of 0.2HRC, The medium hardness is 0.4HRC and the high hardness is 0.6HRC.
5. Cone angle of the surface Rockwell hardness tester: The Rockwell hardness value of the indenter surface increases as the taper angle of the diamond indenter increases. For the 30N and 45N scales, the angle change has a large influence on low hardness and a small effect on high hardness. There is almost no effect on the 15N scale and the 30N scale high hardness block.
6. Rockwell hardness tester surface inspection: The sample is generally flat when tested. If the surface specimen is tested and its radius of curvature is not large, the test result should be corrected. For convex specimens, the correction amount should be added because the hardness measurement value is lowered; the correction amount should be subtracted from the concave specimen.
7. Digital Rockwell hardness tester does not display the cause: The power supply is unreachable, check whether the power cable is turned on; the fuse is blown, and the fuse in the accessory box is removed.
8. Surface Rockwell Hardness Tester Installation Precautions: After opening the top cover of the package and the surrounding baffles, remove the four fixing screws at the bottom of the fuselage to place the hardness tester in a dry and clean and non-corrosive gas and no vibration around. in the room. The table on which the hardness tester is to be mounted should be sturdy and a hole with a diameter greater than Ф50 mm should be made for the lead screw to pass.
9. Horizontal adjustment of Rockwell hardness tester: When adjusting, install the Daping operation table on the upper end of the screw, then place the level on the operation table and adjust it so that the level of the hardness tester is within 0.2/1000.
Storage Rack,Bathroom Storage Rack,Bathroom Towel Rack
Xinhui Mingcheng Hardware Mamufacture Limited of Jiangmen City , https://www.gd-jmmc.com