Vacuum melting furnace: 2017

2017年5月25日星期四

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.

2017年5月19日星期五

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.

2017年5月17日星期三

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.

2017年5月15日星期一

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.

2017年4月27日星期四

How many reasonable vacuum induction furnace quotation?

Vacuum induction furnace belongs to a kind of vacuum furnace, mainly by the effect of electromagnetic induction, creates an electric current in metal furnace charge itself, and then rely on the resistance of the metal charge itself, according to the joule - lenz's law, the electric energy into heat energy, thus melting metal. Because the vacuum induction furnace without pollution, environmental benefits is better, therefore, it is very popular with the consumers in the market. When consumer is buying the vacuum induction furnace, besides will focus on the quality of the products, for the product price is also very the attention of the market price of vacuum induction furnace above? Vacuum induction furnace reasonable price?
Now, vacuum induction furnace above the market price is very chaotic, there are some bad suppliers use inferior materials product, thereby reducing the product cost, thereby lowering the price of vacuum induction furnace, as a result, some consumers will choose cheaper products, thus caused the chaos on the market of vacuum induction furnace, the product quality is uneven, the price of the good and bad are intermingled. The market the vacuum induction furnace above the price is reasonable? How much is the vacuum induction furnace?
Actually, because the quality of the vacuum induction furnace and cost issues, in general, the vacuum induction furnace quotation above market should in 4-100000 yuan or so, but there is some price is thousands or even hundreds of, these products are advised consumers to choose carefully, because the quality of these products may have some defects, and, of course, can also be second-hand products, so consumers need to consider carefully.

2017年4月6日星期四

Induction melting furnace in iron industry

In the iron industry, the two most commonly used to induction melting furnace were power frequency induction furnace and intermediate frequency induction melting furnace.
First for medium frequency induction melting furnace, its strong adaptability, the variety of burden or piece of degree is not very strict, so widely used in melting cast iron, its melting alloy cast iron, nodular cast iron and so on need induction smelting products are widely used in manufacturing.
Power frequency induction furnace melting slag is relatively slow, some are not suitable for slagging, production lack of flexibility, cold start need to start, but at the same time it makes heating and metal melting, uniform heating temperature, burning loss is small, can facilitate the regulation of iron liquid ingredients, small relatively dirty. So usually suitable for metals and alloys remelting and heating up.

2017年2月7日星期二

Said vacuum brazing furnace, induction furnace of actual use

Practical applications of induction furnace
A, induction furnace used for heat treatment: all kinds of metal partial or whole quenching, annealing, tempering, diathermy;
Second, the induction furnace used for thermal type: the whole parts forging, forging, hot upsetting, hot rolling;
Three, induction furnace is used for welding, brazing of various kinds of metal products, all kinds of cutter blades, saw blade welding, steel pipe, copper pipe welding, the same dissimilar metal welding;
Four, induction furnace used for smelting metal: gold, silver, copper, iron, aluminum and other metal (vacuum), smelting, casting molding and evaporation coating;
Five, high-frequency heating machine other applications: semiconductor crystal growth, shrink fit, bottle heat sealing, toothpaste heat sealing, powder coating, metal implants plastic, etc

2017年1月16日星期一

The vacuum melting furnace

Equipment USES the product is mainly used for universities and colleges, scientific research institutions and production enterprises under the condition of vacuum or protective atmosphere of metal materials (such as stainless steel, nickel base alloy, copper, alloy steel, nickel and cobalt alloys, rare earth neodymium iron 錋) melting processing, can also be used for alloy steel vacuum refining processing and precision casting.
This product by the furnace cover, furnace body structure, furnace bottom, slewing mechanism of crucible, vacuum system and intermediate frequency power supply control system, etc.
Furnace cover, furnace, furnace bottom adopts double water cooling structure, keep the temperature of the bof shell is not more than 60 ℃. Furnace cover opened the way for manual and the furnace cover with observation holes and damper, to facilitate adding alloying elements to the process of melting, furnace cover on AD hoc alloy feeder. Furnace is an induction coil, by manual rotation handle outside the furnace can be easily within the crucible melting liquid poured into the mold, mold can be designed to be cooled. Upper crucible is equipped with a temperature measuring device.
By secondary pump, vacuum system, K - 300 oil diffusion pump and 2 x - 70 mechanical pump, mechanical pump is equipped with electromagnetic relief valve on the return oil after avoid blackouts. With bleed valve and charging valve on the vacuum unit.

2017年1月9日星期一

Correct single crystal furnace is safe and efficient operation

Single crystal furnace operation is also a science, before the formal operation, we need to check whether the temperature inside the furnace is suitable feed, does not allow loading in high temperature, check on the single crystal furnace control device to run, all the equipment should be under normal circumstances can be switched on.
Before loading operation, check the need to install the material, not into large pieces of material, removed first, back to the same melting also want to take it out, after crushing smaller material can be normal use, to ensure the normal operation of the incoming request is higher in a certain degree of the crucible, does not allow low, quartz crucible wall should pay attention to cleanliness, can't touch or other contact. Select the crucible can't rotate.
Operating equipment should pay attention to not be sharp Angle of the cut, at the time of loading to should take put down gently, not careless rude, the operator should pass professional guidance, bring clean gloves can't again after contact in addition to material things, to ensure that the material is clean, serious and responsible operation, smooth material had better be to realize a successful placement. Chunks of material not only after crushing, but should be placed close to the wall, adding suitable amount of dopant rear can continue to put small pieces of material.

2017年1月3日星期二

How to improve the service life of vacuum induction furnace lining

Induction of the vacuum furnace lining refractory materials used for the high temperature performance mainly depends on the physical and chemical properties and mineral composition, on the premise of raw and auxiliary materials selection, sintering process is to make the lining have good microscopic structure to give full play to its high temperature resistant performance of the key working procedure. Lining sintering densification degree and refractory material ratio of the chemical composition, particle size, sintering process and sintering temperature and other factors. Ningbo shekinah electric co., LTD., through ten years of trial and error and production test, summarized the knot reasonable construction technology and baking sintering process, the sharp rise in the furnace life, induction furnace life of vacuum furnace dry rammed lining (a long) as much as 1157 times, has obtained the remarkable economic benefits.
Second, the construction process
1, when the furnace building remove mica paper.
2, the furnace building made of crystal quartz sand as follows:
Hand picking, mainly eliminate block and other impurities;
Magnetic separation: the magnetic must be completely removed;
Dry ramming material: must slow drying processing, baking temperature of 200 ℃ to 300 ℃, heat preservation more than 4 hours.
3, the selection of binder: with boron anhydride (B2O3) instead of boric acid (H3BO3) as a binder, the addition amount of 1.1% to 1.1%.

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