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1, hardness tester, pay attention to "be careful
2. When the hardness tester is not used for a long time, apply the dust cover to cover the machine, and periodically inject a small amount of sewing oil on the contact surface between the screw and the hand wheel.
3, before the use of hardness tester, the top surface of the screw should be wiped the top surface of the table, if you find that the hardness error shows a large error, you can take the workbench, check with the screw contact surface is not clean Investigate whether the screw protection sleeve is lifting up the worktable and check whether the pressure head is damaged.
4. When replacing the indenter or anvil, pay attention to the contact area to clean. After changing, test the steel with a certain hardness for several times until the same hardness values ​​are obtained twice in succession. The purpose is to make the indenter or anvil contact with the part of the tester compacted, good contact, so as not to affect the accuracy of the test results
5. After the hardness tester is adjusted, when the hardness is measured, the first test point is not used. The measured value is inaccurate due to the fear that the sample is not in contact with the anvil. After the first test is finished, the hardness tester is in the normal operating state and the test sample is officially tested. The measured hardness value is recorded.
6, loading and unloading pressure head should be carefully, to ensure no damage to the tip, no pollution, the installation surface clean and free from foreign matter. Do not unload properly for long periods of time, pay attention to rust prevention
7. The surface of sample stage and standard hardness block should be clean and free from scratches, scratches, bumps;
8, the test sample must be placed smooth, reliable support, to ensure that there is no displacement, deformation during the test process
9, daily work environment and shut down should pay attention to dust, anti-corrosion medium. In some of the more humid areas, should always pay attention to anti-rust Shanghai Ruifeng Instrument Manufacturing Co., Ltd. is a professional manufacturing, production and sales of integrated enterprise Main products: viscometer, coring machine, water tank, anti-osmotic instrument, extraction Instrument, sand equivalent, hydraulic stripper, extension meter, asphalt mixer, oven, low-temperature water tank, kinematic viscosity meter, road viscometer, Cleveland flash point meter. The company is located in Shanghai known as the international metropolis - Shanghai . The company has always been focused on product quality, product cost performance, customer requirements, and product innovation, practicality, and convenience. The excellent management concept is well-known throughout the industry. At the same time, good quality, low price, good service and enthusiastic working attitude have won the favor and trust of the new and old customers.
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