Vacuum melting furnace: vacuum hardening furnace

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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19日星期一

Induction melting furnace in iron industry "charm"

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.

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.

2016年11月24日星期四

Excellent performance of vacuum furnace

The pressure inside the chamber of a stove or furnace smoke into industrial furnace is lower than the atmospheric pressure. Vacuum furnace heating power, the heated surface oxidation, no decarburization, small deformation, the mechanical performance is good. Use the vacuum furnace smelting metal to remove impurities, less finished pinhole, segregation of small, good quality. Vacuum furnace is suitable for the high quality, high purity, refractory metal melting and heating, such as tungsten, molybdenum, tantalum, niobium, titanium, heat-resistant alloy steel smelting and magnetic materials, electrical materials of high strength steel, stainless steel, tool steel and die steel, heat treatment.
Before and after vacuum furnace appeared in the 1930 s. In 1927 the United States made electrical material vacuum annealing furnace. Vacuum since 1953 arc furnace power consumption in industry have been used for melting titanium sponge. Before and after the '50 s vacuum induction furnace is widely applied in industry. In 1960 the United States developed oil quenching vacuum furnace.

2016年11月21日星期一

Introduction of refractories in different position of induction melting furnace

The lining of introduction melting furnace is divided into four parts: furnace lid, furnace hearth, throat and and sensor. Especially throat,the most critical position’s refractory material directly affects the life and operating costs of the furnace.
1.Refractory material used in lid
The main effect of furnace lid is to reduce the heat loss of furnace, preventing the metal liquid splash, which requires the lid to be light weight, good insulation effect and anti-corrosion. At present, CCEWOOL ceramic fiber is light weight and low thermal conductivity, thus it is the most ideal refractory lining material. Due to the working temperature of furnace is below 800C, using steel nail or steel mesh to fix the blanket on lid
2.Refractory material used in hearth
The refractory material of hearth should use low porosity and high density CCEWOOL high alumina bricks.
3.Refractory material used in throat and sensor
The structure of throat and sensor is complicated, thus it mostly adopts unshaped refractory material. Castable uses high alumina refractory material, like corundum, mullite.

2016年11月13日星期日

Discharge phenomenon in vacuum induction melting furnace

So shall we talk about, it measures have? Decline in the power supply voltage, increasing turn distance; Choose reasonable furnace coil connection methods are can be reached by effect of electric field strength. However, because of the limitation of by the coil structure, often cannot increase turns distance. Therefore, combined method of coil to become crucial in the planning of induction furnace.
(1) small vacuum furnace induction melting furnace usually choose single induction coil, (can supply voltage) between two terminal voltage of the biggest, interturn voltage is very low. And essential way to prevent this kind of induction furnace discharge is a decline in the power supply voltage, with increased according to the specific conditions of turns distance from (usually turn distance in 5 ~ 10 mm, not too much or it will cause a decrease in the electrical power). In the process of planning practice, most small vacuum induction furnace power use 250 v voltage, will not cause in the process of producing discharge of [3].
(2) large and medium-sized vacuum induction melting furnace sometimes needs to choose the method to connect two or more coils - series (figure 2) (a) or parallel (as shown in figure 2 (b)). Two conditions interturn electric field intensity can present different situation, analysis is as follows.
(a) for the two induction coil in series, in a flash the polarity as shown. Two coil into the electrical terminals (A +), the electrical terminals (B -) adjacent, assume that the supply voltage RMS V. According to the principle of electrotechnics, the two adjacent terminals (A +, B -) between the voltage amplitude was flat, in the opposite direction. For a maximum of 2 V. Maximum instantaneous field strength for/air gap.
(b) for the two induction coil in parallel, in a flash the polarity as shown. Two coil into the electrical terminals (A +), (B +) adjacent, assume that the supply voltage RMS V. According to the principle of electrotechnics, the two adjacent terminals (A + B +) between the voltage amplitude was flat, direction. For a maximum of 0. The maximum instantaneous field intensity is zero. The above analysis of vacuum induction melting furnace discharge phenomenon.

2016年11月10日星期四

Intermediate frequency electric furnace safety operation procedures

1, check things out before blowing in electrical equipment, water cooling system, sensor brass etc are in good condition, otherwise prohibited furnace.
2, furnace melting in excess of the prescribed shall promptly repair. It is strictly prohibited in melting too deep inside the crucible for melting.
3, sending and furnace should have someone who's in charge, after sending it is forbidden to contact sensors and cables. On duty shall not leave post, pay attention to the sensor and external circumstance of crucible.
4, loading, should check harmful items such as burden in presence of flammable and explosive mixed with, if you have to remove timely, it is forbidden to cold and wet material directly add to the liquid steel, melted liquid filled with first division after it is forbidden to chunk is expected to join in case cover.
5, and tamped crucible, scrap iron, iron oxide are forbidden to mix, rammed crucible must be compact.
6, pouring fields and official pit furnace should have no obstacle, no water, in case the steel landing explode.
7, molten steel are not allowed to dress too full, hand carry bags when pouring, two of them should be conformed to walk should be smooth, not allowed to walk fast abrupt stop, after pouring yu gang in a designated place, it is forbidden to dump.
8, intermediate frequency generator room should be kept clean, it is strictly prohibited flammable and explosive goods and other debris into indoor, indoor smoking ban.

2016年11月9日星期三

Principle of intermediate frequency furnace by what job

How medium frequency melting furnace works, what is the principle of intermediate frequency furnace? , for example, put a metal cylinder has alternating medium frequency current in induction coil, metal cylinder has no direct contact with induction coil, electric coil temperature is very low, but the surfaces are heated to redness, and even melt, and the redness and melting speed as long as adjust the size and the strength of the current frequency can be achieved. If the cylinder on the coil center, surrounding the cylinder temperature is the same, the cylinder heating and melting did not produce harmful gases, light environmental pollution.
Here is to introduce: medium frequency melting furnace is a kind of will power frequency 50 HZ alternating current into intermediate frequency (above 300 HZ and 20 k HZ) power supply device, the three-phase alternating current (ac) power frequency, after rectification into direct current, then laid adjustable intermediate frequency electric current, direct current supply by capacitance and induction coil in through the intermediate frequency alternating current, generate high density magnetic field lines in the induction coil, induction coil, and cutting in cheng fang of metal materials, produce a lot of eddy current in the metal materials. The vortex also has some properties of intermediate frequency electric current, i.e., the metal itself free electrons in the resistance of the metal body flow to generate heat.

2016年11月3日星期四

Medium frequency melting furnace main characteristics

Medium frequency melting furnace medium frequency power supply adopts solid-state IGBT inverter and power regulation, is the assurance of high reliability;
Medium frequency melting furnace equipment in the design the all-round protection function like over current protection, owe water protection, overheating protection, over-voltage protection, short circuit protection, open phase protection, etc., more than increase equipment reliability and convenient equipment maintenance work;
Medium frequency melting furnace equipment has a variety of display functions such as frequency display, voltage, current, power, according to make the equipment working condition direct, to design and capacitance induction coil regulation more guidance;
Medium frequency melting furnace super small volume, light weight, portable, covers an area of less than 1 square meters;
Medium frequency melting furnace 24 hours uninterrupted smelting capacity;
Intermediate frequency furnace energy saving energy saving, capable, electromagnetic stirring of molten material more uniform;
Medium frequency melting furnace convenient change different weight, different materials, different ways of the furnace body, to adapt to the requirements of various kinds of melting.

2016年10月26日星期三

Medium frequency induction furnace work on what principle

How intermediate frequency induction furnace works, what is the principle of intermediate frequency induction furnace, the following is to introduce: medium frequency induction furnace is a kind of will power frequency 50 HZ alternating current into intermediate frequency (above 300 HZ and 20 k HZ) power supply device, the three-phase alternating current (ac) power frequency, after rectification into direct current, then laid adjustable intermediate frequency electric current, direct current supply by capacitance and induction coil in through the intermediate frequency alternating current, generate high density magnetic field lines in the induction coil, induction coil, and cutting in cheng fang of metal materials, produce a lot of eddy current in the metal materials.
The vortex also has some properties of intermediate frequency electric current, i.e., the metal itself free electrons in the resistance of the metal body flow to generate heat. , for example, put a metal cylinder has alternating medium frequency current in induction coil, metal cylinder has no direct contact with induction coil, electric coil temperature is very low, but the surfaces are heated to redness, and even melt, and the redness and melting speed as long as adjust the size and the strength of the current frequency can be achieved. If the cylinder on the coil center, surrounding the cylinder temperature is the same, the cylinder heating and melting did not produce harmful gases, light environmental pollution.

2016年10月23日星期日

Several advantages of medium frequency induction furnace

1 simple, intermediate frequency induction furnace equipment. Compared with electric arc furnace, medium frequency induction 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 induction furnace, high 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 induction 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, the comprehensive cost of the intermediate frequency induction furnace is lower than other steelmaking process.

2016年10月19日星期三

Induction heating furnace of market strategy

Induction heating technology in metallurgical industry heat treatment is a new energy-saving technology. In heat treatment industry, the induction heating furnace because of its fast heating, high energy utilization and energy conservation and environmental protection advantages is widely attention and application of heat treatment industry is a revolutionary technological progress. And iron and steel production, for example in metallurgical industry, iron and steel production points, long, short process, short process of smelting process is based on electric furnace smelting equipment, renewable scrap steel as the main raw material, the production process is beneficial to environmental protection, along with the advance of the electric furnace smelting technology, short process of smelting technology has more and more strong vitality and competitiveness.
There are two kinds of iron and steel production process, short process and long process. Long process consists of the blast furnace, converter, continuous casting and rolling process consisting of; Short process is made up of electric furnace, refining outside the furnace, continuous casting and rolling process. Long process of smelting process for iron ore, coke, coal, limestone and so on scarce resources dependence is extremely strong, is not conducive to environmental protection. At the same time, the discharge of waste gas, waste residue, waste water in the process of production is bigger, dealing with three wastes costs is higher, make long process technology is facing challenges. Short process of smelting process in electric furnace for smelting equipment, renewable scrap steel as the main raw material, is beneficial to environmental protection, in terms of short process of smelting equipment, electric furnace, divided into two kinds of electric arc furnace and induction furnace. Although the traditional electric arc furnace in metallurgical industry occupies a dominant position. But the induction furnace smelting principle makes it have the advantage of innate difference in electric arc furnace.

2016年10月17日星期一

Medium frequency melting furnace cast iron is the development direction

Compared with cupola, using medium frequency furnace iron liquid, can reduce pollution of the environment, is advantageous to the liquid iron quality control, investment is less, and can be easily for nodular cast iron, vermicular cast iron and grey cast iron and other cast iron grade of production, mode of production is very flexible. Compared with using mainly iron ingredients melting scrap steel carburization process smelting iron liquid, can reduce the cost of iron liquid, 1000 yuan.
Medium frequency furnace melting iron liquid, after crushing, processing clean blasting foundry return, can significantly improve the quality of molten iron, reduce energy consumption of molten iron. Our foundry in 10 t worked as a production test on the intermediate frequency furnace, using clean furnace charge back, in the production of high-power diesel engine cylinder head, casting blowhole rejection rate was 6% lower, liquid iron smelting consumption reduce 90 kw · h/t; At the same time can effectively reduce the labor intensity of workers, grilled slag, improving casting smelting operation environment, reduce the slagging phenomenon of power frequency furnace throat opening, solve the problem of difficult after the oven slagging, prolonging the service life of power frequency furnace lining 20%, improve the efficiency of smelting production. Therefore, using medium frequency furnace melting iron liquid, to attach great importance to purification of furnace charge, especially back to the burden of crushing, blasting purification treatment, which is play the efficiency of the intermediate frequency furnace smelting iron a very important link.

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