How to deal with the sudden power failure of the intermediate frequency electric furnace

If there is a power outage, the method to be used depends on the state of the power outage.

I don't know how to deal with the workpiece if there is a sudden power outage when the workpiece is inductively hardened, and it is not possible to continue quenching, right? Just start from scratch, if the hardness is too high, it can't work, is there only annealing?

1。If the technical requirements of the parts are not high, reserve a certain distance and continue to quench;

2。If you are not allowed to leave a soft belt, you have to anneal and dry again.

Induction hardening: If there is a power outage, if the power is cut off before it has been heated to the quenching temperature, you only need to wait until the temperature drops to room temperature and then reheat it.

If it is heated to the quenching temperature and the power goes off without cooling, it is equivalent to normalizing and does not need to be treated with other treatment.

If there is a power failure during the cooling process, it is best to carry out a normalization and then heat and quench, and do not use induction heating tempering, otherwise it is easy to cause cracking.

The structure is not complicated, it can be directly quenched from scratch, and the complex structure should be annealed first and then quenched. Some small workpieces or materials with good hardenability can also be hardened by air cooling...

It is necessary to analyze it according to the specific situation, if it is a power outage during the heating process, generally speaking, it is necessary to re-heat and quench according to the process requirements.

The simple thing is: if the continuity of surface quenching is very high, it is best to re-quench after annealing, and if the continuity requirements are high from time to time, then directly follow the quenching. The processing methods in my factory are:

Anyway, it is recommended that you look at the usage, if it is a key part, and the power failure occurs during the heating process, the internal organization will be affected, or according to the pre-treatment process of the incoming material and then return to the furnace and then intermediate frequency!

If it is a melting furnace, remember two things: one is that the furnace should be emptied, and the other is that the induction coil should be cooled quickly.

Generally, before installing the equipment, it is necessary to take into account the treatment measures of sudden power failure, such as installing generators, diesel water pumps, or setting up a large water tank, overhead points, and connecting with the induction coil, so that when there is no power, the induction coil can also be cooled by the high potential water level pressure.

If the material in the furnace has become fluid, it should be poured out quickly. It's easy to do in the solid state. It's best to leave nothing at all, especially in liquid form.

In case of sudden power failure of the intermediate frequency melting furnace, emergency measures should be taken to supplement the cooling water to the furnace induction coil (to prevent high temperature from damaging the insulation of the induction coil). (There is also a temporary connection to tap water by switching the water supply section door).

In order to prevent the accumulation of furnace water and the difficulty of starting the whole whole, the furnace water is poured out by manual transmission.

Summary. 1. The size of the electrical power that can be handled, that is, the ability to withstand voltage and current, is the most important parameter. 2. Power electronic devices generally work in the switching state.

3. In practice, power electronic devices often need to be controlled by information electronic circuits, such as lithium battery manufacturers use them to control batteries. 4. In order to ensure that the temperature of the device is too high and damaged due to the heat dissipated by loss, not only the heat dissipation design of the device package is emphasized, but the heat sink is generally installed when it is working.

The intermediate frequency electric furnace starts up, and the current suddenly trips and then resumes.

Hello dear to you, that's the thermal protection jump shield staring gate, open the case, clean the dust inside, especially the stupid fan that cools the power semiconductors, and check whether the thermal grease under the electric belt Xili semiconductors has failed.

My model is kgps400 1000 power semiconductors in**I didn't find it.

1. Energy refers to the magnitude of Gaoshili's electric power, that is, the ability to withstand voltage and current, which is the most important parameter. 2. Power electronic devices generally work in a switch-like state. 3. In practice, power electronic devices often need to be controlled by information electronic circuits, such as lithium battery manufacturers use them to control batteries.

4. In order to ensure that the temperature of the device is too high and damaged due to the heat dissipated by loss, not only the heat dissipation design of the device packaging is emphasized, but also the dissipation heater is generally installed when it is working.

1. When the machine is turned on, the equipment cannot start normally.

Fault phenomenon: the DC current is large when starting, the DC voltage and intermediate frequency voltage are low, and the sound of the equipment is dull.

Analysis and processing: The thyristor with one arm of the inverter bridge may be short-circuited or open-circuited, resulting in the operation of the three-arm bridge of the inverter bridge. Use an oscilloscope to observe the thyristor voltage drop waveform on the four bridge arms of the inverter bridge, if the voltage drop waveform of the thyristor on one bridge arm is a line, the thyristor has been penetrated; In the case of a sine wave, the thyristor is not conducted.

Replacement of Thyristor Penetration; Find out why the thyristor is not turning on.

2. The equipment can start, but the working state is wrong.

Therefore, the phenomenon of forest branch barrier: the equipment can start normally and smoothly, and when the power rises to a certain value, overvoltage or overcurrent protection.

Analyze and process: Find the cause of the failure in two steps:

1) First run the equipment without load, and observe whether the voltage of the electric dissipator wheel can rise to the rated value. If the voltage cannot rise to the rated value, and the voltage is around a certain value for many times, the overcurrent protection is protected. This may be caused by insufficient compensation capacitance or thyristor voltage, but it cannot be ruled out that it is caused by ignition of some part of the circuit;

2) If the voltage can rise to the rated value, the equipment can be transferred to heavy-duty operation, and observe whether the current value can reach the rated value. Special attention should be paid to the interference of the electromagnetic field of medium frequency and high current to the control part and signal line.