Figure 2. Brinell press.
WORK PROCEDURE.
1.
The structure of the TSH-2M type instrument (Fig. 2) and the method of
measuring material hardness are introduced.
2.
the diameter of the ball, the value of the load and the holding time are selected
based on the table.
3.
The sample is prepared for inspection, if necessary, the surface of the sample is
cleaned with sandpaper.
4.
The three-barrel is mounted on the mandrel and the set screw is tightened.
5.
Loads corresponding to the selected load are placed on the pallet.
6.
Do not forget that the base with the lever system produces a load of 1.875 kN.
7.
The holding time required for the selected load is determined.
8.
The sample is placed on the test table so that the center of the ball track is at least
2.5 mm from the edge of the sample.
9.
Press the button and the engine starts.
10.
After the inspection is completed (the lamp goes out and the electric motor stops),
the table is lowered by turning the flywheel and the sample is taken.
11.
The check is repeated 3 times.
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12.
The diameter of the ball track is determined and the Brinell hardness is calculated.
13.
Based on the results, the following table is filled in:
4 – Laboratory work
REPORT
Topic: Determination of hardness of steels by carbon content. Brinnell and Rockwell
methods
1. Purpose of work.
2. Necessary equipment and measuring instruments.
3 . Summary of the work done.
Control questions
1. Describe the main differences between steel and cast iron.
2. What types of furnaces do you know that are used in steel production?
3. What types of steel do you know?
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