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Specifications:

Turret type: Manual turret

Measuring range: 8-2900HV

Test force: 2.942, 4.903, 9.807, 19.61, 29.42, 49.03N (0.3, 0.5, 1, 2, 3, 5kgf)

Max. height of test piece: 160mm

Depth of throat: 135mm

Magnifications of measuring system: 200X, 400X

Min. test unit: 0.0625μm

Dwelling time: 0-60s (1 second for increment)

Power supply: AC 220V, 50-60Hz

Dimensions: 520 x 230 x 650mm

Weight: approx. 40kg

Standard accessories

Measuring microscope (10X eyepiece): 1 pc.

Large test table: 1 pc.

Middle test table: 1 pc.

V-shape test table: 1 pc.

Weight: 3 pcs.

Level adjusting screws: 4 pcs.

Diamond pyramid penetrator: 1 pc.

Vickers standardized block: 2 pcs.

Fuse (2A): 2 pcs.

Power cable: 1 pc.

 

As well known, hardness tester is hvs testing instrument. With the rapid development of science and technology, and the emergence of various new materials, hardness testers play an increasingly important role in production and life. The precautions and maintenance items about the hardness tester are also the problem that we should pay attention to. Let us study together.

Vickers hardenss tester factory

Precautions for the use of the hardness tester:

(1) The hardness tester itself produces two kinds of errors: one is the error caused by the deformation and movement of its parts; the other is the error caused by the hardness parameter exceeding the specified standard. Regarding the second error, the hardness tester is calibrated with a standard block before measurement. Regarding the rockwell hardness test results, the difference is within ±1. A stable value with a difference of ±2 can give a correction value. When the difference is outside the range of ±2, the hardness tester must be repaired or replaced by other hardness test methods.

hvs testing methods of various hardness testers also stipulate corresponding calibration standards. The standard block used to calibrate the hardness tester cannot be used on both sides, due to that the standard surface and the back surface hardness are not necessarily the same. The standard block is generally valid for one year from calibration date .

(2) When replacing the indenter or anvil, please note that the contact parts should be cleaned. After the replacement, it is tested several times with a steel sample of a certain hardness until the hardness values obtained twice in succession are the same. The purpose is to make the contact part of the indenter or anvil and the testing machine compact, and the contact is good, so as not to affect the accuracy of the test result.

(3) After the hardness tester is adjusted, when the hardness is measured, the first test point is not used. The measured value is not accurate due to the fear that the sample is not in good contact with the anvil. After the first point is tested, the hardness tester is in the normal operating mechanism state and then the sample is formally tested, and the measured hardness value is recorded.

(4) In the case where the test piece allows, generally select at least three hardness values for different parts, take the average value, and take the average value as the hardness value of the test piece.

(5) For the shape of the test piece, the corresponding shape of the block should be used, and it can be tested after being fixed. The round test piece is generally tested in a V-groove.

(6) Before loading, check whether the loading handle is placed in the unloading position. When loading, the action should be light and steady. Do not use too much force. The loading handle should be placed in the unloading position after loading, so as to avoid the instrument being in a load state for a long time, plastic deformation occurs, which affects the measurement accuracy.

HVS-5 Vickers hardness tester

Durability of the hardness tester:

When the hardness tester is not used for a long time, cover the machine with a dust cover.

Regularly inject a small amount of oil into the contact surface between the lead screw and the handwheel.

Before using the hardness tester, wipe the top surface of the lead screw and the upper end surface of the workbench.

If the hardness indication error is found to be large:

1 You can take down the workbench and check if it is clean with the screw contact surface;

2 Check if the screw protection sleeve is jacking up the workbench;

3 Check if the indenter is damaged.

If the main test force is applied, the indicator hand starts to rotate very quickly, and then slowly rotates, indicating that the buffer is inside.

There is too little oil. At this point, the felt pad at the upper end of the bumper can be picked up and the clean 32# oil can be slowly injected. At the same time, the handle is added and unloaded several times, so that the piston moves up and down a plurality of times, and the air in the buffer is completely eliminated until the oil overflows from the top when the piston sinks to the bottom.

Regularly check the accuracy of the hardness tester with the standard hardness block carried by the machine.

The hardness tester used normally should be checked regularly and the verifier should not exceed 12 months.

Wipe the workbench and the standard hardness block and test it on the hardness block working surface. It is not allowed to test on the bearing surface.

If the indication error is large, check the standard hardness block support surface for burrs. If there is burr, apply oil stone to light.

When testing at different positions of the standard hardness block, the hardness block should be dragged on the workbench and should not be taken off the workbench.

The hardness tester should be checked periodically and periodically. For example, the screw is tightened as soon as it is loose.

hardness tester factory pictures

I believe that everyone here has a clearer understanding of the operation notes and maintenance of the hardness tester. I hope that we can use it correctly during the  hvs testing.

Standard : GB/T 4340.2, ISO 6507-2 and ASTM E92

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