Rockwell hardness tester repair and common faults - Database & Sql Blog Articles

Rockwell hardness tester failure and repair

This paper mainly analyzes

JJG112-2003

The metal Rockwell hardness tester is based on the verification procedures.

Rockwell

Analysis and elimination of precautions and faults in the hardness test.

one

before

Word

Metal Rockwell hardness tester is hereinafter referred to as hardness tester for hardness measurement of various metal materials.

it

The test principle is the initial test force

F0

Total test force

F

Under pressure, the pressure of the indenter

Sample surface,

Unloading the main test force

F1

,

Measure the residual depth of the indentation when retaining the initial test force

h

Rockwell hardness tester failure and maintenance This paper mainly analyzes and eliminates the precautions and faults in the Rockwell hardness tester under the JJG112-2003 metal Rockwell hardness tester. A preface metal Rockwell hardness tester is hereinafter referred to as the hardness test for various metal materials. Its test principle is to remove the surface of the pressure head sample under the action of the initial test force F0 and the total test force F. The main test force F1, measuring the residual depth of the indentation h when the initial test force is retained


Rockwell hardness tester failure and maintenance This paper mainly analyzes and eliminates the precautions and faults in the Rockwell hardness tester under the JJG112-2003 metal Rockwell hardness tester. A preface metal Rockwell hardness tester is hereinafter referred to as the hardness test for various metal materials. Its test principle is to remove the surface of the pressure head sample under the action of the initial test force F0 and the total test force F. The main test force F1 measures the residual depth h of the indentation when the initial test force is retained. Two problems in the hardness test. Before the HR-150 Rockwell hardness test, do not use the hardness block to measure the indication error of the hardness tester. First, determine whether the working state of the tested hardness tester is in normal working condition. Pay attention to the following questions: 1. Determine whether the hardness tester is installed horizontally. Judgment method: Open the back cover of the weight and check whether the weight is freely plumb. During the loading process, the two inner or bottom supports cannot be touched. 2, check the position of the boom is normal, the judgment method: use HRC high hardness block other lines plus the initial test force when the pointer has been rotated three times, then press up again, let the pointer turn a half turn, in three circles and a half Within 10 squares, the position of the boom is normal. If it is not normal, adjust the method: 1 Adjust the length of the weight hanger, adjust the two adjusting screws on the boom up and down to adjust to the normal working position; 2 adjust the height of the lever, The method is: open the upper cover, remove the front indicator dial indicator, loosen the screws on the front and top two fixed lever heights, and then adjust the two screws in the top counterbore, obviously see the lever up or down For movement, you can adjust to the appropriate position and tighten the four set screws. 3. Check whether the cushioning device of the hardness tester is fully loaded within 4 to 6 seconds. Adjustment method: