Induction process and common failure analysis

Induction process and common failure analysis

Induction smelting step useful check single crystal furnace, try single crystal furnace before formal jobs, single crystal furnace, melting product sampling inspection, adjustment test, the use of single crystal furnace power security, after the completion of these steps can be omitted.
Should be reviewed by induction melting equipment, see if there are any obvious damaged parts, and then according to the requirements of specification to the trial operation, if after trial work is normal, you can begin to formal production, but also constantly in the process of production of check products, to see if some of the products, product quality is qualified, if the index is not up to standard, will adjust the machine quality is unqualified, until melting product quality up to par.
Common single crystal furnace fault are crystal rods, single crystal furnace crystal rod shaking machine can still functioning, but the production efficiency is low, induction smelting products quality is poor so in order to improve the efficiency of the induction melting and quality, not blind smelting, must inspect the single crystal furnace. The wafers shake to check the pull head, cooling system and vacuum system. If there is a problem with the pull head, repair the moderating mechanism or the rotating mechanism. If there is a problem with the cooling system and vacuum system, it is necessary to adjust the structure of the silicon and the heavy hammer. There is no problem if you examine these places, see if the inert gas such as argon flow inside the furnace, argon gas flow in the furnace, requires a modified single crystal furnace, the evenness of single crystal furnace thermal field distribution.

The vacuum induction furnace USES considerations

The vacuum induction furnace USES considerations

In the process of induction smelting, be careful and careful. In the process of operation, you should pay more attention to the safety of the person and protect the equipment.
During vacuum induction melting operation part, should be carried out in accordance with the relevant operation process, if not in accordance with the operating rules, is easy to vacuum pump body is damaged, resulting in a serious accident, will not only harm health, life and damage to equipment will also have a certain role.
In smelting operation, should beware of electric shock, such as electrode, rotating electrode copper wires, copper power supply box with a certain capacity, so be sure to properly insulating protection, so it can avoid electric shock. At the same time also need to protect good eye, if the temperature is too high, need to cover the observation hole of the baffle, if is necessary, you will need to wear sunglasses.
In the process of smelting, be careful to maintain a good environment and be aware of ventilation, and the mechanical pump's windpipe is needed to reach the outside of the window. You also need to dry the floor and not allow water. In the process of smelting, the circulation of circulating water should be guaranteed.
After all the operation, if you need cooling water, it will take a period of time, usually two hours.
After a period of time in the use of vacuum furnace, vacuum furnace shall be clean, especially the dead Angle, easy accumulation of dirt, in the process of wiping the vacuum furnace to pay attention to safety. If the flammable liquid such as alcohol and acetone is used to clean the vacuum furnace, the body should be above the vacuum furnace.
In the course of operation, fire prevention should be prepared. In the course of operation, wear the work clothes and gloves. Masks, try not to reveal the skin.

The structural characteristics of vacuum induction furnace

The structural characteristics of vacuum induction furnace

Description: the vacuum induction furnace is characterized by a sealed furnace shell outside the sensor and a pumping system
Vacuum induction furnace is the process of smelting and pouring under vacuum. It is characterized by a sealed furnace shell outside the sensor and a pumping system. The furnace cover of the furnace can be opened. Crucible, sensors and ingot mould is put inside the furnace shell, crucible sensor structure is the same as ordinary induction furnace, can be mounted on the furnace shell under the vacuum loading, temperature measuring and sampling device, and is equipped with observation holes. The furnace shell is cooled during the smelting process, the furnace shell is sealed and vacuum, the limit of vacuum is 0.01 ~ 0.001 Pa, and the vacuum is 0.1 Pa. The vacuum of the large vacuum induction furnace is lower than the small vacuum induction furnace.

The vacuum furnace system is mainly composed

The vacuum furnace system is mainly composed

The vacuum furnace system consists mainly of vacuum system, heating system and relevant control equipment.
The vacuum system consists of mechanical pump, diffusion pump, main road valve, bypass valve and high vacuum damper. The mechanical pump is a crude vacuum device, which is powered by a three-phase ac motor, and the work and stop of the pump is realized through the contact of ac contactor. High vacuum oil diffusion pump for high vacuum device, with the former mechanical pump and diffusion pump oil level, and the function of electric furnace heating extraction of the high vacuum degree requirements, through absorption and disconnect ac contactor control the on and off of electric heating furnace, and then control the action of diffusion pump and stop.
Heating system is composed of heating power and heating element, heating power magnetic voltage regulator, using dc excitation power supply for contactless smooth stepless voltage regulation of load, the dc excitation power supply controlled by power governor, governor using temperature controller and power detected by thermocouple temperature current value and the difference between the set value, the PID arithmetic, the output of 4 ~ 20 ma dc signal, control magnetic voltage regulator of magnetic saturation voltage, and then according to the set temperature control curve of temperature controller to realize the heating current and temperature automatic control.
In the design of the distributed control system, make full use of the computer a powerful computing and data processing function, timely monitoring system working condition, especially the introduction of intelligent automatic setting of PID parameters, further enhance the control index of the vacuum furnace system.