Introduction to the maintenance of Rockwell hardness tester

(1) When the hardness tester is not used for a long time, the machine should be covered with a dust cover.
(2) Regularly inject a small amount of engine oil into the contact surface between the screw and the handwheel.
(3) Before using the hardness tester, the top surface of the screw and the top surface of the workbench should be wiped clean.
(4) If the hardness indication error is found to be large:
① You can take off the workbench and check whether the contact surface between it and the screw is clean;
② Check whether the screw protective cover lifts up the workbench;
③ Check whether the pressure head is damaged.
(5) If the indicator pointer starts to rotate quickly and then slowly when the main test force is applied, it means that there is too little oil in the buffer. At this time, you can lift the felt pad on the upper end of the buffer and slowly inject clean 20# engine oil. . At the same time, pull and push the handle several times to make the piston move up and down several times to remove all the air in the buffer until oil overflows from the top when the piston sinks to the bottom.
(6) Use the standard hardness block carried by the machine to regularly check the accuracy of the hardness meter.
① Clean the workbench and standard hardness block, and conduct the test on the working surface of the hardness block. Testing on the supporting surface is never allowed.
② If the indication error is large, in addition to checking according to item 4 of this section, check whether there are burrs on the supporting surface of the standard hardness block. If there are burrs, polish them with a whetstone.
③ When testing at different positions of the standard hardness block, the hardness block should be dragged on the workbench and should not be taken away from the workbench.
(7) This instrument should be checked regularly and calibrated periodically.