Vacuum melting furnace

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%.

2016年12月30日星期五

Medium frequency induction furnace

Vacuum brazing furnace, medium frequency induction furnace medium frequency induction furnace used for power supply in 150 - a - 10000 hz frequency range of induction furnace as medium frequency induction furnace, the main in 150 - a - 2500 hz frequency range. Domestic small frequency power frequency induction furnace for 150, 1000 and 2500 Hertz.
Medium frequency induction furnace is a kind of applicable to the smelting of high quality steel and alloy smelting equipment, and work well in induction furnace has the following advantages:
1) the melting speed, high production efficiency. Medium frequency induction furnace power density is big, the power of each tonne of steel liquid configuration than about 20 a 30% larger power frequency induction furnace. Therefore, in the same conditions of medium frequency induction furnace melting speed, high production efficiency.
2) strong adaptability, flexible use. Each in medium frequency induction furnace molten steel can all net, replace the steel grade is convenient; Per furnace and power frequency induction furnace molten steel does not allow the net, you must retain part of the liquid steel for the start of furnace, thus replacing steel grade is not convenient, only applies to single varieties of steel smelting.
3) electromagnetic stirring effect is better. As a result of the liquid steel under electromagnetic force is with power frequency is inversely proportional to the square root, so stirring force of intermediate frequency power supply is smaller than power frequency power supply. For removing impurities in steel and homogeneous chemical composition, uniform temperature, stirring effect of intermediate frequency power supply is better. Power frequency power supply big stir force make molten steel on the lining of scouring force increases, not only reduce the refining effect and can dramatically reduce the useful service life of crucible.
4) starting operation is convenient. Due to the skin effect of medium frequency current greater than the power frequency current, so the intermediate frequency induction furnace at the start, no special requirements to burden, after loading can rapid heating temperature; While power frequency induction furnace for specialized production of furnace charge block (and the approximate size of crucible, about in the cast steel or cast iron piece of crucible half height) to start the heating, and heating up slowly. Read this, under the condition of cycle operation mostly use medium frequency induction furnace. Start convenient bring another advantage is that can save electricity when cycle operation.

2016年12月28日星期三

The preparation and production of induction melting furnace before use operation procedures

Preparation of the induction melting furnace before use
1. Check each distributor is normal.
2. Check the water, water pressure and flow rate is in line with the requirements.
3. Check the vacuum pump and vacuum system is normal.
4. Check the control cabinet and temperature measuring meter and the indicator light is normal.
5. The processed workpiece cleaned thoroughly with alcohol or gasoline
6. Artifacts in furnace, tooling, material basket, etc shall be clean and dry.
7. Vacuum cleaning furnace scale and sundry.
8. Use silk or wool fabric dipped in alcohol or gasoline wipe the oven door and furnace cover seal.
9. The workpiece is put should smooth and may not be in the running and scattered and crooked blowing process.
Induction melting furnace production operation procedures
1. The starting power supply, set the switch control cabinet in automatic control location.
2. Input the parameters of the process planning into the computer.
3. The workpiece with charging car smoothly away in furnace.
4. Close the oven door and lock (cover), to ensure the seal.
5. According to the technological requirements to choose good cooling medium and cooling method and pressure.
6. Press the cycle start button, equipment execution procedures: vacuum heating _ _ cooling automatically.
7. Check the equipment each system operation is normal, if there is any abnormal timely report the captain.
8. Before, we should restore the normal pressure in the furnace, the light is normal after open the oven door (cover).
9. When discharging, carefully operation, workpiece and tooling shall glory hole collision.

2016年12月23日星期五

Intermediate frequency electric furnace casting low-temperature wax

Intermediate frequency electric furnace casting low-temperature wax mould dewaxing easy preparation, high recovery and reuse pattern material. Faults caused by the low softening temperature strength is low, can not meet the higher requirements for quality castings, low temperature wax stearic acid in the process of using easy saponification deterioration of the casting surface quality, based on the above shortcomings have popped up in the production of medium temperature wax instead of low temperature wax and now the stearic acid price is more expensive, according to the manufacturer with their own way to choose a color.

2016年12月19日星期一

Induction melting furnace in iron industry "charm"

2016年12月15日星期四

Induction melting operation steps and common fault 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. Crystal rods should inspect lift shaking head, cooling system and vacuum system. If it is lift head appear problem, is under maintenance, changed institutions or rotating mechanism. If it is cooling system and vacuum system appear problem, need to adjust the silicon material and structure of a 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.

2016年12月12日星期一

Technical characteristics of medium frequency melting furnace

Medium frequency melting furnace for melting equipment in cast iron smelting and duplex melting has decades of history, China's manufacturing and labor frequency furnace and medium frequency furnace has a wealth of experience, in the power structure, frequency conversion technology, integrated control, circulating cooling technology and so on many aspects have made remarkable progress. Using medium frequency furnace melting and heat preservation of more and more manufacturers.
Medium frequency melting furnace features:
1) used for smelting medium frequency melting furnace, at present can be made in a single capacity also can achieve nearly tons, can meet the needs of the mass production. But many enterprises power capacity expansion is often difficult to overcome obstacles. Therefore, medium frequency melting furnace is more suitable for small and medium scale production.
2) commonly used medium frequency melting furnace to melt the various grades of steel and non-ferrous metals. Just for iron casting production, the adaptability of medium frequency melting furnace to product better than the cupola, medium frequency melting furnace can be a variety of high alloy cast iron smelting, such as high chromium cast iron.
3) medium frequency melting furnace are discontinuous melting, interval for a period of time to provide equal to furnace capacity of iron liquid, mode of production for stage duty, medium frequency melting furnace are more appropriate.

2016年12月8日星期四

Several advantages of medium frequency furnace

Medium frequency furnace has the following advantages:
1 simple, intermediate frequency furnace equipment. Compared with electric arc furnace, intermediate frequency furnace itself does not need large furnace equipment, don't need a large furnace equipment (such as hydraulic pressure, rotating mechanism, etc.), also don't require a lot of water cooling system, so its monomer equipment investment is relatively low, the equipment is simple and easy to master.
2, only has the function of the steel because of intermediate frequency furnace, no oxygen blowing in steelmaking process, so don't oxygen generator and other large equipment, it can also save money.
3, due to the small size, medium frequency furnace height is low, so the factory also was much lower than other steelmaking workshop, therefore, its cost in the factory building construction is also less than other types of steelmaking plant.
4, small and intermediate frequency furnace capacity, production arrangement is more flexible, especially suitable for small single piece casting production.
5, in addition, power frequency furnace and its related technology level is low, short-term easy to grasp.
6, the most low-end products in the market demand is not high, intermediate frequency furnace comprehensive cost is lower than other steelmaking process.

2016年12月4日星期日

The application of medium frequency induction heating technology

Induction heating technology in our country the earliest application military-industrial complex, automobiles, machinery and other industries, then gradually expand to the metallurgical industry, in the early 1980 s shougang special steel company in the domestic first began using the intermediate frequency heating technology, with 45 momnb, 35 crmo, 40 cr, 40 mn2mo and 45 # steel quenched and tempered treatment; For GCr15 steel tube cold working in the middle of the softening heat treatment; On 5 cr21mn9ni4n steel pipe solution heat treatment; For T10A, mn2 20, 20 # steel bar annealing heat treatment, has achieved good effect.
Using electromagnetic induction heating principle of intermediate frequency electric current for oil well tube of quenching, tempering and normalizing, in the United States and other developed countries have already belongs to a kind of mature technology, and in the field of oil special pipe manufacture to a wide range of applications. LONGSTAR company, unlimited companies in the United States, Russia, Japan JFE company tower dry rogge metallurgy factory, the volga steel pipe enterprise has its own medium frequency induction heat treatment production line.
Induction heating by electricity as an energy source, is completely different from using natural gas, gas, such as gas or liquefied petroleum gas in the heating process of steel tube produces soot, form of air pollution. Because power belongs to the green energy, will not cause damage to the environment, accord with the requirement of human society for environmental protection, so the government encourages the development of environmental protection technology development at home and abroad. At the same time, the use of induction heating technology to quenching, tempering and normalizing of steel tube, fast heating, high efficiency and convenient production organization

2016年12月1日星期四

What is the intermediate frequency furnace?

Intermediate frequency furnace using 200-2500 hz frequency induction heating power supply, heat insulation, it is mainly used for smelting carbon steel, alloy steel, special steel, also can be used for copper, aluminum and other non-ferrous metal smelting and the temperature. Equipment is small in size, light weight, high efficiency, less consumption, melting heat up quickly, easy to control furnace temperature, high production efficiency.
Medium frequency induction furnace hot water works
Using medium frequency furnace power supply mode is different from the power frequency electric boiler, is a 380 v power frequency ac power input of intermediate frequency power supply cabinet (intermediate frequency power supply is contained in the over-voltage protection, over-current protection, such as over voltage, over current phenomenon will automatically stop alarm), in the medium frequency power supply will be contained in the power frequency ac power rectifier for single phase dc, again through the inverter single-phase ac frequency voltage, electric current (single-phase ac frequency voltage and current are safe), the single-phase ac frequency voltage and current input induction heater produced for induction heating of the water in the boiler. This boiler heating process cwe separation, safe and reliable.

2016年11月28日星期一

Intermediate frequency electric furnace development in modern casting production

Modern medium frequency electric furnace machinery manufacturing technology and the rapid development of metallurgical technology on casting quality, elaboration, and energy saving requirements, such as high performance of ductile iron castings, vermicular graphite cast iron and the application of aluminum alloy castings, high quality castings, makes the induction furnace is increasingly important in the position in modern casting production. All made and new foundry casting workshop, the fuss made or acquire induction furnace is usually in the first place. As a result, "" in the selection of induction furnace is a subject worth attention.
Efficient, reliable and flexible operation of the intermediate frequency induction furnace of the development of manufacturing technology in vigilance and establishing the important position of induction furnace in foundry production process has played a role cannot be underestimated. From the bottom and has nearly a century of compared to traditional power frequency induction furnace, whether from the technical performance and job performance or from the aspects of investment, medium frequency induction furnace is the undisputed dominance. That makes it rapidly changing since the late 80 s of last century is widely applied in developed countries such as Europe, America, basically replaced the traditional power frequency induction furnace in our country has gradually disappeared from the market, the existing power frequency induction furnace in foundry are gradually replaced by medium frequency induction furnace in this technical improvement.

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