Rockwell hardness tester using the method?
1 test preparation work before
Loading speed adjustment of the main test force, handle [16] in the unloading position, hand [13] to the position of the 1471N, the 35-55HRC standard hardness blocks on the work table, rotating the handwheel [27] make the hardness block from the top of the spindle [1], plus the drive test force, pulling the handle [15] add the main test force, large observation indicator the pointer, from starts to rotate to stop the time should be in the range 4~8 seconds, such as inconsistent, rotary oil needle [14] adjusted, repeatedly, until the appropriate date.
2 the choice of test force
Turning the handle [13] to make the test force selected alignment red dot, but care must be taken to transform the test force, handle [16] must be placed in the unloading state that after the limit position
3 installation of pressure head
Install the pressure head should pay attention to eliminate the clearance between the pressure head and spindle [1] end. Elimination method is: the pressure head is installed, and with the screw [28] lightly fixed, then the standard block or test piece on the work table, rotating the handwheel [27] plus initial test force, pulling the handle so that the main force of the test on [15] pressure head, and then tighten the screw [28], can eliminate the gap between the spindle and the pressure head.
4 test procedure
Table -1 the screw [26] top surface and to be selected on the lower end face of clean, the worktable is arranged on the screw [26]
-2 the test piece support surface clean, on the work table, rotating the handwheel [27] working table to slowly rising, and the top pressure head, to small pointer pointing to the red point, large pointer rotation three laps vertical difference of + 5 so far allow you graduated, if more than 5 of your graduation, this point should be cancelled re test.
-3 rotation indicator [24] shell, the C, B length between reticle and large pointer to counter clockwise rotation can be positive CIS.
Pull the handle -4 loading [15], applying main test force, then the pointer indicator counterclockwise rotation
-5 when the rotating indicator pointer significant pauses after unloading handle can be [16] back, pay attention to dismount the main test force: applied with removable main test force, are required to slow
-6 from the corresponding indicator scale reading: the diamond indenter test, according to the outer dial the black words read; using ball indenter test, according to the inner ring of the scarlet letter dial reading
-7 turn the handwheel to make specimen decline, and then gently moving the specimen, the new test according to the 2-6 process
-8 screw protection set [30] in order to protect the screw [26] from dust invasion and process. When the hardness is not used or when the specimen height is less than 100mm, which is sheathed on the screw rod outside. When the height of the specimen is greater than 100mm, it must be removed, so as not to table top, resulting in no effect test