NAME OF THE TEST: HARDNESS TEST
AIM : OBJECT TO DETERMINE HARDNESS TEST OF A METARIAL
It become necessary to test engineering materials before they are accepted for processing, buying or applying to determine whatever or not they meet the spefications required. One of the tests is hardness test. The Rockwell and brinell machines are those most commonly used for this purpose. PROCUDURE AND LABORATORY REPORT
1. Understad thoroughly the operation of each machine, and check its operation before proceeding. 2.Check the calibration of the Rockwell machines with standard calibration test blocks for the scale selected. 3.Using the appropriate scale
a. Check the hardness of each test specimen on Rockwell test machine. b. Tabulate the results.
c. Convert all readings to either Rb or Rc values.
d. Apply the cylindrical correction factors for cylindrical specimens. 4. Using the hardness conversation chart, find the tensile strength of the steel samples. OPERATIONS OF HARDNESS TESTING EQUIPMENT
The following operation guide is a general one.Follow it carefully and observe caution and care at every step of the operation.No motion of any controls should be abrupt or using too much force, both of which would damage the instrument. Step 1: Calibration
Operate the tester using both test blocks and record what you get and what they are supposed to be. Thus you can scale your data accordingly be as close as the correct numbers corresponding to the actual hardness. Step 2: testing to sample
STEP BY STEP OPERATION
1.Selected the correct combination of weights and penetrators for the hardness scale you wish to use . 2.Make certain that the crank is in forward position.
3.Place sample on the anvil.
4.Slowly turn the wheel spokes clockwise. This raises the anvil and sample away toward the penetrator tip. After contact is gently made, continue...