Brinell hardness test procedures and precautions

The Brinell hardness tester adopts the hydraulic principle and exerts test force by manual operation. This instrument is the only portable hardness tester in the world that uses 3000kg test force and 10mm ball standard Brinell test conditions. Test conditions and test accuracy are in accordance with domestic and international standards GB/T231.1, ISO6506, and ASTME10. The instrument can be used to test castings, forgings, steels in the state of supply, non-ferrous metals, and semi-finished steel workpieces that have been heat treated. Brinell hardness tester (2 photos) Portable instrument used in the workshop, simple operation, easy to carry, can test large-scale workpieces in the field without sampling, can achieve the detection of large parts of the workpiece, Brinell hardness test procedures and precautions There are the following points.

First, the operation of the use of steps;

1 Preparation before test (1) Preparation of sample:

I. The surface of the specimen is smooth and flat. There should be no scale, decarburized layer, carburized layer, plating layer and other dirt. In particular, there should be no grease.

II. The indentation edge of the specimen should be clear enough, if necessary, it should be polished, and the indentation diameter has been accurately read.

(2) Selection and installation of test bench: According to the shape and size of the sample, select an appropriate workbench and place the workbench in the mounting hole of the screw.

(3) Preselection of total test force: preselection of test force must be completed before test.

(4) Calibration of the tester: calibrate the tester with the standard hardness test block, and fill out the "Daily hardness tester verification record" after the calibration is completed.

Second, the verification process (1) will be tested on the worktable, and wipe its support surface clean. Rotate the handwheel to slowly raise the table until the sample contacts the indenter and causes the handwheel to slip relative to the nut.

(2) Turn on the power, and the power indicator (red light) lights up at this time. Start the button switch and immediately make preparations for tightening the fixing screws on the right side of the fuselage. When the charge indicator (green light) is on, tighten it quickly so that the disk rotates with the crank until it automatically reverses and stops. The light from the protection charge indicator flashes to extinguishment for the duration of the test.

(3) Turn the handwheel to remove the tested sample and read the indentation diameter of the sample using the reading microscope.

(4) According to the "metal Brinell hardness value table" to find the corresponding hardness value.

(5) Clean up the test site.

Third, the Brinell hardness tester Notes (1) hardness tester should pay attention to maintenance, when not covered with a dust cover. The screw should add a little oil according to the situation.

(2) Before the hardness tester is used, wipe the top surface of the lead screw and the top surface of the worktable;

(3) Regularly check the accuracy of the hardness tester with a standard block, and never allow it to be tested on the support surface;

(4) When the standard block bearing surface has a burr applied whetstone light, in different locations, the hard block should be dragged on the table, should not be taken away from the table.

(5) The hardness tester is used, maintained, and kept by professionals, and it is calibrated regularly with standard blocks, and the hardness tester is periodically tested according to the regulations.

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