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Automatic Brinell Hardness Tester Repair

Aug August, 2018

The automatic Brinell hardness tester is widely used in the production of Brinell hardness values of unhardened steel, cast iron, non-ferrous metals and soft bearing alloys due to its ability to measure a wide range of hardness values. This article takes the Cangzhou Ou Bie Brinell Hardness Tester as an example to talk about some common faults and troubleshooting methods. 1. Load error exceeds ±1.0% or is unstable

Causes and troubleshooting of such failures:

(1) The blade of the force point is loose, and the blade should be adjusted and tightened;

(2) The wear of the blade and the fulcrum of the force point will increase the load error to varying degrees, and the blade should be repaired;

(3) The position of the adjustment block on the load lever is not appropriate, and it can be moved forward or backward according to the situation.

(4) The compression spring is rusted, which increases the friction with the pressure shaft and the main shaft bushing. The rusted part should be cleaned and the oil should be replaced or replaced.

(5) The loading is not stable, there is shock vibration phenomenon, and factors causing instability may be excluded.

2. The loading speed can not be controlled within the specified time

The loading speed is too fast or too slow, mainly because the viscosity of the gear unit oil is too small or too large. The gear unit should be cleaned and the oil for the gear unit should be replaced.

3. The measured hardness of the Brinell hardness tester is inconsistent with the standard hardness block indication

Causes and troubleshooting of such failures:

(1) The hardness tester is not installed horizontally, and the hardness tester should be adjusted to the level;

(2) The surface of the steel ball is not smooth or the diameter exceeds the tolerance, and the qualified steel ball is selected by using a micrometer;

(3) The error of the indentation measuring device is too large, and the allowable error of the indentation measuring device should be adjusted to make it ≤±0.5%;

(4) The weight cannot be placed vertically. The weight should be rubbed against the back cover of the hardness tester. Check whether the lifting ring is hung on the key cutting edge and whether the hanger boom is straight. Otherwise, the lifting ring should be hung on the key cutting edge. Hanger

(5) The verticality of the spindle and the test platform, the coaxiality between the spindle axis and the axis of the lifting screw is too poor. The verticality of the spindle and the test platform, the coaxiality of the spindle axis and the axis of the lifting screw should be analyzed according to the situation. .

4. The hardness tester repeatedly loaded and unloaded

The length of the ejector pin should be adjusted and fixed; (2) The installation position of the reversing switch is improper, the movable baffle can not touch the pin on the reversing switch, and the reversing switch does not change direction. The installation position of the reversing switch should be adjusted.

5. The hardness tester load is fully stopped

The cause of the failure is that the contact point of the reversing switch has burns and ablation, resulting in poor contact at the contact point. The contact point should be cleaned and polished or replaced with a new reversing switch.

6. The button switch is pressed, the hardness tester does not move, but there is a squeaky current sound

The reason for this failure is that the motor is out of phase. Check whether the maintenance of the Brinell hardness tester is normal, whether the power plug is plugged in, whether the cable is open, whether the power switch is intact, whether the motor wiring is firmly connected, and whether the motor coil is burnt out. Whether the group and the switch contacts are in good contact, etc., should be excluded according to their conditions.

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