Rockwell hardness tester calibration in the attention of the problem

莱州华银试验仪器有限公司

Release time:

2022/11/03

Rockwell hardness tester hereinafter referred to as the hardness tester is suitable for the determination of the hardness of various metal materials,it is the principle of the test in the initial test force F0 and the total test force F successively under the action of the indenter pressure sample surface,unloading the Rockwell hardness tester hereinafter referred to as the hardness tester is suitable for the determination of the hardness of various metal materials,its test principle is in the initial test force F0 and the total test force F successive role,the indenter pressure specimen surface,unloading of the main test force F1,measurement of indentation residual depth of retention of the initial test force when h.

Rockwell hardness tester hereinafter referred to as the hardness tester is suitable for the determination of the hardness of various metal materials,it is the principle of the test in the initial test force F0 and the total test force F successively under the action of the indenter pressure sample surface,unloading the

Rockwell hardness tester hereinafter referred to as the hardness tester is suitable for the determination of the hardness of various metal materials,its test principle is in the initial test force F0 and the total test force F successive role,the indenter pressure specimen surface,unloading of the main test force F1,measurement of indentation residual depth of retention of the initial test force when h.

Hardness tester calibration in the attention of the problem

Rockwell hardness calibration before,first do not use the hardness block to measure the hardness tester's display value error,the first to determine whether the hardness tester is tested in the normal working condition,which requires attention to the following points

1,to determine whether the hardness tester installation position is horizontal,judgment method:open the back cover of the weights,check whether the weights are free plumb,in the loading process,can not touch the two inner or bottom bracket.

2,check whether the boom position is normal,judgment method:with HRC high hardness block other also line plus the initial test force when the pointer has rotated three times,then again upward pressure,so that the pointer and then turn half a circle in three and a half plus or minus 10 grams within the position of the boom is normal,such as not normal,the adjustment method:

①adjust the length of the weights boom,the two adjusting screws on the boom up and down,adjusted to the normal working position;②adjust the height of the lever,the method.

②adjust the height of the lever,the method is:open the upper cover,remove the front of the indicator device percent meter loosen the front and top two fixed lever height screws,and then adjust the top countersunk holes in the two screws,you can clearly see the lever upward or downward movement can be adjusted to the appropriate position in the tightening of the four positioning screws.

3,check the hardness tester buffer device is fully loaded in 4 to 6 seconds,the adjustment method:NDT resource network to open the back cover,see the buffer device,there is an adjustable knob,adjust it can be adjusted to buffer fast or slow,if there is no oil in the buffer or lack of oil loading there will be a shock sound,it is necessary to buffer in the hydraulic oil,refueling should be pried up the dust ring is best to use the best oil snatch refueling,refueling volume can be.

4,loading action is normal.Above are normal but also to see whether the loading action is normal,in the load conversion can be normal,60,100,150 conversion,if not,then you need to adjust the position of the weights,which has an impact on the measurement of HRA,HRB hardness.

HRA and HRC pressure head is the same,HRB forФ1.588mm steel ball,in the measurement of HRB should pay attention to:HRB hardness value is very small,the measured object is very soft,if the normal measurement,the HRB hardness value is high,it may beФ1.588mm steel ball deformation,need to be replaced,in the unlikely event of failure to replace the ball can be removed to reload a try in the verification of HRA,HRB,HRA,HRB,HRC,pay attention to the conversion between the load.

5,the above normal can start formal calibration work.

Check if you find HRC high hardness and low hardness is not linear error,generally caused by the damage to the steel pressure head,this time the need to replace the pressure head,if the error is into a linear relationship,the adjustment method:open the upper cover plate,adjust the thimble on the small cover piece,adjusted inward,the indication of hardness will be adjusted to the value of the hardness,adjusted outward,the indication of hardness will be adjusted to the value of the hardness of the small,repeated adjustments until the hardness tester is qualified.

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