Vacuum sintering furnace: 2016

2016年12月29日星期四

The classification of vacuum sintering furnace and the specific use for details

Vacuum sintering furnace is mainly used for metal powder products, metal injection forming products, hard alloy, ceramic, sintered ndfeb, stainless steel, non-woven fabrics, etc. High temperature of vacuum sintering furnace and vacuum heat treatment furnace structure is basically the same, just according to the sintering process make the appropriate changes.
Vacuum sintering furnace is divided into double vacuum sintering furnace and single loop outdoor pressurized air cooled vacuum sintering furnace Double the same sintering furnace, vacuum sintering furnace has two public a set of vacuum system and electric control system; In operation, two furnace for heating and cooling, mutual used interchangeably. No.1 has one time in the same furnace, degreasing, the function of the sintering and sintering. Degreasing system including external pipeline, vacuum valve, condenser, collector and mechanical pump device. Single cycle outdoor pressurized air cooled sintering furnace need high vacuum pumping speed of vacuum unit, to meet the requirements of ndfeb sintering process. This furnace structure and single loop outdoor pressure gas quenching vacuum furnace are the same.

2016年12月28日星期三

Vacuum sintering cemented carbide is the main production process

Vacuum dewaxing sintering furnace can be a one-time degumming, sintering, cooling and molding charge of a full set of technical process. In the traditional drying sintering furnace structure added a graphite on the basis of the tank, and low voltage carrier gas dewaxing process is adopted to be collected wax device isolated after bonding (molding) agent, residual gas in a variety of ways.
With the above process, forming agent is not in the oven and it touches a cold surface accumulated inside the furnace, also won't pollution insulation and heating element. Vacuum sintering cemented carbide is the main production process, the sintering process for vacuum dewaxing sintering furnace temperature must be integrated according to the corresponding to the sintering products in the process of sintering temperature curve to carry on the control, the tracking error and overshoot amount have strict index requirements.

2016年12月23日星期五

Vacuum pressure sintering furnace

In vacuum pressure sintering furnace this equipment, sintering material under high temperature is also subject to mechanical stress and the effect of vacuum, can be used in the sintering density after casting products. General powder material filling in the graphite mold, mechanical pressure by 700-1500 mn/m3, and heated to 2500 ℃ in the vacuum. Mold by direct current heating, indirect heating.
Vacuum pressure sintering furnace is mainly used for sintering is the density of the material with high temperature gas reactions billet, such as oxide, carbide and boride gas after sintering material can reach very high density, general density is greater than the theoretical value of 95%, and with high purity. Graphite resistor and graphite mould in the vacuum operation of weight loss is minimal. Vacuum hot pressing sintering is at the same time in the compaction process and utilization of high pressure, temperature and time, and many other parameters to control the quality of the sintered body.

2016年12月19日星期一

Vacuum sintering furnace is how to work?

2016年12月15日星期四

The design of vacuum sintering furnace

Vacuum sintering furnace with perfect performance design, integrating multiple patents at a suit, security, reliability and practicability of the best results. The design of vacuum sintering furnace advantages are:
1, using vacuum forming technology, electric stove wire inlay on the inner surface of the ceramic plate, a molding chamber of a stove or furnace tank, to prevent pollution by volatile matter.
2, the four sides of electric stove wire installed in the chamber of a stove or furnace, special heat insulation design, furnace can be replaced.
3, double shell, air circulation and heat insulation, the surface temperature is low.
4, fast loading quickly open the oven door design, loading convenient, structure of double ended, the outer pressure vessel welding technology.
5, with the door automatic power-off protection design, has the ultra high temperature alarm function, with functions of thermocouple damaged power outages, with functions of built-in password control parameters.
6, with no paper record history data and curve of temperature, the temperature deviation error correction function, can manage multiple devices and remote fault diagnosis analysis.
7, multiple security protection design, safety performance is good, long service life.

2016年12月12日星期一

The vertical design of the control system of high temperature and vacuum sintering furnace

Vertical high temperature vacuum sintering furnace system structure and function. Based on the system requirements and design of the operating process based on distributed, modular DCS control solutions. Detailed discusses the hardware configuration and software design of the control system, realize the real time monitoring of production process equipment operation condition and was accused of amount of online real-time display. This control scheme has simple hardware, the configuration of flexible characteristics, applicable to small and medium-sized control system.
With the continuous development of science and technology, industry, national defense, aerospace and other fields in China have made great progress, the vacuum furnace equipment manufacturing equipment level, production process, control technology also has the very big enhancement. Prompted materials along with the continuous improvement of science and technology in the field of development, in the aviation, aerospace, military industry, energy and chemical industry in areas such as some special material, the new material has been widely used. The vacuum heat treatment technology in the production of these special materials, new materials manufacturing process plays a more and more important role. Vertical high temperature vacuum sintering furnace is mainly suitable for cemented carbide, ceramics, magnetic materials, porous materials of vacuum sintering, can meet all kinds of high temperature oxidation resistant coating the surface of the parts sintering requirements, is developed for a domestic space military enterprise space equipment specialized equipment, mainly by the vacuum system, furnace, bottom sliding on the oven door and locking mechanism, closed water system, heating power systems and electrical automatic control system, etc.

2016年12月8日星期四

The main characteristics of the vacuum furnace

Is a vacuum induction melting equipment, can be through vacuum conditions using the intermediate frequency induction heating principle of molten metal and sintering power. Its application in the field of metal materials, such as nickel, special steel, precision alloy, copper alloy, metal dysprosium, ndfeb, active metal, high temperature alloy, special materials, magnetic materials, etc. These metal materials can be melt, casting in vacuum or protective atmosphere sintering test.
Features:
1. Temperature as high as 3000 degrees Celsius;
2. Far infrared thermometer.
3 water cooling;
4. The pid control;
The highest temperature: 3000 ° C
High volume: 0.01 m3, 0.01 m3 and 0.02 m3, 0.05 m3, 0.1 cubic meters, 0.15 cubic meters, 0,0.3 m3
Working atmosphere: vacuum furnace, hydrogen, nitrogen, the inert gas
Temperature uniformity: plus or minus 10 ° C or less
The measurement of temperature: 800 ~ 3500 ° C temperature or 0 ~ 3500 ° C infrared optical fiber temperature measurement range. Accuracy: 0.2 ~ 0.75%.
Temperature control: process control and manual control; Control accuracy: + / - 1 ° C
Limit GongReLv: 200 ° C/min (hot blast stove, according to the size and the high temperature furnace configuration).

2016年12月4日星期日

The classification of vacuum sintering furnace and the specific use for details

2016年12月1日星期四

Vacuum sintering cemented carbide is the main production process

2016年11月28日星期一

Vacuum pressure sintering furnace

2016年11月23日星期三

Vacuum sintering furnace is how to work?

2016年11月21日星期一

The design of vacuum sintering furnace

2016年11月18日星期五

Vacuum sintering furnace working principle and structural function

Vacuum sintering furnace is in a vacuum environment to be heated objects in protective sintering furnace, its heating mode is more, such as resistance heating, induction heating, microwave heating, etc. Vacuum induction furnace is heated objects to make use of induction heating protective sintering furnace, can be divided into the power frequency, medium frequency, high-frequency, such as type, can be ascribed to a subclass of vacuum sintering furnace. Vacuum induction furnace is under vacuum or protective atmosphere conditions, using the principle of intermediate frequency induction heating make hard alloy tool bit and all kinds of metal powder compacting sintering of complete sets of equipment, is for hard alloy, metal dysprosium, designed in the industrial production of ceramic materials.
For more than a, main structure and the composition structure under vertical and discharging. Its main composition is: the furnace body, vacuum system, water cooling system, pneumatic system, hydraulic system and front-rear institutions, base, workbench, induction heating device (tungsten heater and advanced thermal insulation material), into the electric device, medium frequency power supply and electric control system, etc.
Second, the main function after vacuum filling the hydrogen gas protection, control of furnace pressure and state of sintering atmosphere. Available optical fiber infrared radiation thermometer and armoured thermocouple temperature measurement (0 ~ 2500 ℃), and through the intelligent temperature control after comparing with the setup program, select the execution state feedback to intermediate frequency power supply, automatic control temperature and heat preservation program.
Tungsten, main principle and USES vacuum induction furnace is after vacuum filling hydrogen protection condition, by using the principle of intermediate frequency induction heating, the high temperature of tungsten crucible in the winding, by heat conduction to work on, suitable for scientific research, military units for hard metal such as tungsten, molybdenum and its alloy powder sintering molding.

2016年11月16日星期三

The maintenance of sintering furnace

1. The new furnace and lining refractories of replacement should be done after drying process. Oven to falling in to rise in stages. At the beginning of the dry, low temperature, long time, when the stove is cold by warming, furnace material of high moisture. In less than 400 degrees Celsius, to open the oven door discharge water vapor. When up to 700 ℃ heat preservation for a period of time. In order to make the temperature of the furnace body evenly.
, mesh belt furnace, the furnace temperature has risen to 400 ℃, shall run for a period of time, for oxidation treatment, improve the life of the net belt.
2. The low melting point impurity in the compact on the chamber of a stove or furnace materials and heating elements are produces erosion, in order to improve the service life of the furnace, should be regularly purification furnace, especially presintering area, try to avoid in the powder metallurgy ingredients add S elements, such as to avoid pollution furnace and heating elements.
3. Regularly clean the stove, in using carbon monoxide or he carbon gases, could be breaking from the decomposition of hydrogen compounds to the carbon, this part of the carbon deposition on the furnace wall and heating elements, it will pollution stove, refractory erosion and damage the electric heating yuan
, so need to regular cleaning the stove.
4. Keep the body clean, regular cleaning furnace of iron oxide, gravel, zinc oxide and other debris.
5. Check the electric heating element and wire connection, prevent poor contact arc.
6. Due to the need of furnace operation under the low dew point, so the leak bolted flange sealed parts regularly
Detection.
7. Do not insert with grease tray in furnace, grease into Shanghai in one thousand will make a sharp increase in dew point affect normal operation.
8. The high temperature, don't play to open the door for a long time, in order to prevent the air into the furnace, damage the electric heating element.
9. No overtemperature operation.

2016年11月13日星期日

Vacuum sintering furnace operation need to be aware of the safety of the "six"

A lot of people in the use of vacuum sintering furnace is will encounter a few problems, it may be because the operator does not pay attention to these problems, the following is to tell everyone about a vacuum sintering furnace safety operation need to be aware of "6"
1, check the vacuum pump power supply system, the pulley belt tightness, vacuum pump oil is located in the oil seal observation hole centerline. Check completed after artificial turn the vacuum pump pulley, without exception, but in the case of closing butterfly valve, vacuum pump.
2, check the vacuum furnace, vacuum furnace in the level of health, good insulation, induction coil, vacuum sealing tape elastic, qualified size.
3, check the lever handle to start the vacuum furnace is flexible.
4, check the rotation type McLeod gauge whether accord with requirement.
5, check the graphite crucible furnace charging accessories are complete.
6, vacuum furnace cover of observation, the thermometer hole, each furnace must be clean processing, in order to observe and temperature measurement.
Above is about the safety of vacuum sintering furnace operation, as long as to master the correct steps and pay attention to some detail problems can make us vacuum sintering furnace and effective operation.

2016年11月10日星期四

How to maintain the vacuum sintering furnace

Vacuum sintering furnace is widely used in ceramics, silicon carbide, carbide materials, electroplating mold material and vacuum sintering graphite purification processing, want to undertake maintenance in the use of vacuum sintering furnace, only to do maintenance can be used more for long.
1, equipment four distribution cabinets clean operations.
2, such as mesh belt for the thimble mesh belt, please use sand paper burnish thimble side, in order to prevent the scratch of cell, if it is a diagonal mesh belt, baking at low speed in the speed of 100 case, to remove organic matter.
3, such as tube infection, organic matter, please be careful with alcohol cotton swab or non-woven fabrics.
4, inside the cavity clean homework (needs pay attention to the porosity have without block).
5, organic rows and heat cleaning operation (including facility and equipment, as well as the equipment of oil cigarette case), please use the organic matter on the alcohol cleaning equipment, etc.
Sealing structure on 6, furnace, vacuum system and other components when disassembling, alcohol or gasoline clean and after dry, apply vacuum grease on it again.
7, the transmission is not allowed if there is a limit, control failure, screens etc. Phenomenon, should immediately stop, don't force, so as not to damage parts.
After
8, vacuum sintering furnace, the furnace, furnace must remain below 66.5 LPA vacuum degree.
9, vacuum pump, valve, measuring instruments, thermal instrumentation, electrical components, such as accessories, must be in accordance with the technical specifications of the products use, repair and maintenance.
10, maintenance operation should be performed under the condition of without electricity. If under the condition of charged for repair, must by the professional maintenance personnel for repair, at the same time to ensure the absolute safety of person and equipment.
11, vacuum sintering furnace aluminum plate spot welding machine mechanical transmission parts should be lubricated periodically or oil changes and maintenance.

2016年11月9日星期三

The main principle of vacuum sintering furnace

Vacuum sintering furnace is in a vacuum environment to be heated objects in protective sintering furnace, its heating mode is more, such as resistance heating, induction heating, microwave heating, etc. Vacuum induction furnace is heated objects to make use of induction heating protective sintering furnace, can be divided into the power frequency, medium frequency, high-frequency, such as type, can be ascribed to a subclass of vacuum sintering furnace. Vacuum induction furnace Vacuum induction furnace is under vacuum or protective atmosphere conditions, using the principle of intermediate frequency induction heating make hard alloy tool bit and all kinds of metal powder compacting sintering of complete sets of equipment, is for hard alloy, metal dysprosium, designed in the industrial production of ceramic materials.
Vacuum induction tungsten hydrogen sintering furnace
One, main principles and purposes Vacuum induction furnace tungsten is after vacuum filling hydrogen protection condition, by using the principle of intermediate frequency induction heating, high temperature make the tungsten crucible in the winding, by heat conduction to work on, suitable for scientific research, military units for hard metal such as tungsten, molybdenum and its alloy powder sintering molding.
Second, the main structure and the structure form is more vertical, the discharging mode. Its main composition is: the furnace body, vacuum system, water cooling system, pneumatic system, hydraulic system and front-rear institutions, base, workbench, induction heating device (tungsten heater and advanced thermal insulation material), into the electric device, medium frequency power supply and electric control system, etc.
Three, the main function After vacuum filling the hydrogen gas protection and control atmosphere in furnace pressure and sintering condition. Available optical fiber infrared radiation thermometer and armoured thermocouple temperature measurement (0 ~ 2500 ℃), and through the intelligent temperature control after comparing with the setup program, select the execution state feedback to intermediate frequency power supply, automatic control temperature and heat preservation program.

2016年11月3日星期四

The characteristics of sintering furnace atmosphere

Atmosphere sintering furnace by using the most advanced temperature measurement, temperature control technology, intelligent techniques, new materials and furnace design, suitable for more atmosphere of all kinds of solid high temperature synthesis, calcining, roasting, sintering, ashing, incineration, melting and heat treatment, etc., has been adapted for use by the world first-class laboratory. The inner loop water cooling system, digital flow monitoring and control system; Using high-performance medium frequency contactor of furnace, automatic conversion; Water, electricity, gas comprehensive PLC automatic control and protection system. The characteristics of sintering furnace atmosphere:
1, atmosphere sintering furnace using special industrial microwave source, can be continuous and stable operation;
2, microwave stepless adjustable output power, achieve precise temperature control curve of temperature;
3, atmosphere sintering furnace adopts imported raytek infrared thermometer, direct measurement of the sample temperature, data are true and correct;
4, special crucible and insulation structure choice, for material non-polluting;
5, can process various microwave properties of materials, excellent versatility;
6, atmosphere sintering furnace gas channel is equipped with two road, fine controllable atmosphere;
7, real-time temperature curve, according to realize the dynamic monitoring of the heating process;
8, the microwave shielding atmosphere sintering furnace safe and reliable design, multiple anti leakage protection.
9, equipped with embedded microcomputer control system, provide manual and automatic, constant temperature three operating modes and are free to switch.

2016年10月31日星期一

What is the importance of vacuum sintering furnace cooling system?

Vacuum sintering furnace is electric heating element near the vacuum heating furnace. Vacuum furnace cooling system is an important part of vacuum furnace. Cooling water should maintain smooth, otherwise the temperature rise caused downtime. This is vacuum furnace work often neglected problems When no one management major damage may result in vacuum furnace.
Molybdenum vacuum furnace heating after long time use will harden, shrinkage, drop, lodging first lap, after fusing (melting) wait for a phenomenon. To make the vacuum furnace heating wire is necessary strength at high temperature, prevent hardening, collapsed or droop, first to design the structure of the vacuum furnace heating wire size, such as spiral wire, pay attention to the heating element bending diameter, pitch and screw pitch diameter, etc. The heating body is going to loose by vacuum furnace insulation lining, 95 ceramic on insulation lining is put aside, leave the expansion space. Shelve location should be suitable for, one is in commonly 100 ~ 100 mm, and can prevent resistance wire to lie prone on strong hook. Also should avoid furnace silk direct contact between each other (short circuit), usually to pad spacer.
Deal with cooling water with biological decomposition chemical auxiliary method, the purpose is to keep the minerals in suspended state, reduce the rubber tube, coil and water jacket in sediment accumulation, to make the water clear. This generally adopts an automatic device to complete, it can monitor the conductivity of the water, automatically added chemicals, wash water, add fresh water. Cooperate with auxiliary steam filtration system, this method can guarantee the pH of the water control, to prevent redundant mineral deposits in the cooling water system. After the system work stable, at least once a month for the water quality test case after processing or owed.
Vacuum tempering furnace shell and the heat exchange equipment material test sample should also be placed in water system, a yearly weight loss test to check the effect of the processing. Coil of diffusion pump cooler must pay special attention to. Should be check regularly. If blocked, diffusion pump will be overheating and loss of function, but also further cause the diffusion pump heater burning, cause of expensive, time-consuming repairs. When snake-like cooling water pipe plug, water will disconnect with water and the drainage and use compressed air to blow or wash with dilute acetic acid solution.

2016年10月26日星期三

What are the factors affecting the quality of vacuum sintering furnace production?

Vacuum sintering furnace production quality besides internal factors and there are many external factors, we take a look at what are the factors that affect the quality of vacuum furnace production.
Structure, temperature control of vacuum sintering furnace, heating process and furnace atmosphere etc., will directly affect the quality of the products after vacuum furnace production. Within the forging heating furnace, raise the temperature of metal, can reduce the melting resistance, but the temperature is too high will cause grain oxide or burnt, seriously affect the quality of the product in a vacuum furnace. In the process of heat treatment, if the steel is heated to above the critical temperature of a point, and then suddenly use cooling cooling, can improve the hardness and strength of steel; If heated to a temperature below the critical temperature at some point after slow cooling, the more resilient and make steel.
So if in order to obtain a more precise size of the workpiece and the surface is bright and clean, can adopt the way of no oxidation furnace for production, control of the oxidation burning loss of vacuum furnace is the key.

2016年10月23日星期日

Vacuum sintering furnace is how to work?

2016年10月19日星期三

In the vacuum furnace temperature distribution

Graphite rod arrangement method on either side of the heating element is decorated in the heating chamber, especially suitable for high vacuum furnace. In a high vacuum atmosphere, thermal radiation produced by on both sides of the heating element area artifacts can be uniformly heated. When the temperature at 400-1300 ℃, heating area each point temperature difference of + / - 5 K. In the '60 s, before the temperature control has been one of the main problems in the heat treatment technology. Because later adopted the technology of electronic temperature control, this problem has been resolved. At present, from the point of view of the temperature distribution, the precision of the hotspot temperature distribution is an important problem.
We almost always preferred to obtain uniform temperature on the structure can guarantee the hotspots, as for temporarily due to some reason make the hotspot temperature uneven phenomenon will disappear with the extension of heat preservation time. On the other hand, the temperature is higher or lower hotspot makes it consistently throughout the harmful effects of heat treatment. Below we present in this fruitful, the temperature gradient is lower than 0.01 K/cm vacuum furnace structure. In addition to the vacuum furnace temperature uniformity, there are some other advantages. Consume less power, completely avoid the use of toxic materials, heating, smoke pollution to the environment to produce outgassing, perfectly solve the problem of the material surface oxidation or distortion. Because of these advantages have now made vacuum furnace heat treatment process of necessary conditions. Heat transfer in a vacuum From the point of heat transfer, vacuum play a dual role.

2016年10月17日星期一

On analysis of nitrogen and oxygen mixed sintering furnace

Chain belt type sintering furnace atmosphere, Cu and O in the appropriate temperature and oxygen content of appropriate conditions the following chemical reaction: Cu + O2 - Cu2O, it has completed the preoxidation of Cu, but actually the suitable oxygen content in the process and the suitable temperature is very important, for this point, the device is equipped with two nitrogen oxygen mass flowmeter with high resolution, the two mass flowmeter in the mixed box respectively on the two interfaces of (mixed box: oxidation of nitrogen and oxygen mixed device), at the same time, each into the chamber of a stove or furnace temperature regions merged with mixed gas box connected to another interface.
Nitrogen oxygen after mixed, each node into the chamber of a stove or furnace, high-precision mass flowmeter guarantees the oxygen content in the hearth can be regulatory. Cu and O2 reaction in suitable conditions, the formation of Cu in Cu2O eutectic phase, it laid a solid foundation for high temperature sintering of DBC.
Chamber of a stove or furnace in actual temperature differ with performance temperature around 10 ℃, the real temperature of the furnace in the platform of high temperature of 1079 ~ 1081 ℃, should be about 12.5 min, under the condition of such process curve, substrate adhesion is good, the test strip adhesion test is within the scope of the requirements (copper and Al2O3 substrate adhesion greater than 60 n/cm, pulling speed of 50 mm/min).
After copper and Al2O3 substrate single adherent, there will be a curved surface radian, this is due to the different expansion coefficient of the Cu and Al2O3. When a second surface adhesion, can eliminate the bending caused by the different expansion coefficient, the surface is very smooth. Between copper and ceramic substrates without any air bubbles.

2016年10月13日星期四

The five requirements of vacuum sintering furnace

In order to guarantee the billet in the sintering process of powder forming dewaxing (lubricant or forming agent), reduction, sintering, alloying and densification, the need when sintering on the sintering temperature, protective atmosphere, ware transmission speed, heating and cooling speed and so on carries on the adjustment and control. Sintering furnace on the structure and function, therefore, should meet the following five requirements:
1. L have perfect dewaxing unit or dewaxing.
2. Has the air tightness, can isolate air outside the furnace and ensure smooth protective atmosphere in the furnace.
3. The temperature control of the paragraphs, paragraphs atmosphere is adjustable;
4. Continuous sintering furnace, with conveyer and the transmission speed is adjustable;
5. With fast cooling device, can be sintered parts rapid cooling to the temperature can be released.
The above is the five requirements, vacuum sintering furnace sintering furnace for sintering of powder metallurgy products of special equipment, its variety, reasonable selection and correct use of sintering furnace to ensure the quality of the powder metallurgy parts.

2016年10月11日星期二

Vacuum sintering furnace safety operation procedures

Vacuum sintering furnace is heated objects to make use of induction heating protective sintering furnace, can be divided into the power frequency, medium frequency, high-frequency, such as type, can be ascribed to a subclass of vacuum sintering furnace. Vacuum induction furnace is under vacuum or protective atmosphere conditions, using the principle of intermediate frequency induction heating make hard alloy tool bit and all kinds of metal powder compacting sintering of complete sets of equipment, is for hard alloy, metal dysprosium, designed in the industrial production of ceramic materials.
Vacuum sintering furnace safety operation procedures
1. Medium frequency induction coil, power supply, vacuum furnace, cooling water, the water of reservoir must be filled with water can not have impurities.
2. To start the pump, that its frequency power, vacuum induction coil, furnace, furnace cooling water circulation system is normal, and adjust the water pressure control in the specified value.
3. Check the vacuum pump power supply system, the pulley belt tightness, vacuum pump oil is located in the oil seal observation hole centerline. Check completed after artificial turn the vacuum pump pulley, without exception, but in the case of closing butterfly valve, vacuum pump.
Within 4. Check the vacuum furnace, vacuum furnace in the level of health, good insulation, induction coil, vacuum sealing tape elastic, qualified size.
5. Check the lever handle to start the vacuum furnace is flexible.
6. Check the rotation type McLeod gauge whether accord with requirement.
7. Check the graphite crucible, furnace charging accessories are complete.
8. After more than ready, connected to the power supply, intermediate frequency power supply switch, started in the intermediate frequency rules, try to start the inverter, success after the stop frequency, before blowing in.
9. Observation, the thermometer hole of the vacuum furnace cover, each furnace must be clean processing, in order to observe and temperature measurement.
10. According to different sintering furnace charging products, adopt corresponding furnace charging mode. According to relevant material plate furnace charging rules, do not get optional change.
11. In order to maintain constant temperature, prevent heat, hot pot and add carbon fiber on the second floor, cover on heat insulation screen again.
12. Good vacuum sealing tape.
13. The operating lever handle, turn the vacuum furnace top cover closely coincide with furnace body, put down the lid, and fixed lock nut.
14. Slowly open the butterfly valve, smoked furnace, air and vacuum degree reach the specified value.
15. After vacuum to specified requirements, to start frequency, adjustment of intermediate frequency power, as stipulated in the relevant material of sintering operation; Heating, heat preservation cooling.
16. After sintering, the stop frequency, the stop frequency conversion switch, inverter stop working, and disconnect the medium frequency power supply points total brake brake and power off.
17. After observed from furnace furnace black hole observation, turn off and disconnect current vacuum pump, vacuum butterfly valve and tap water to cooling and induction coil, furnace, finally stop the pump.
18, intermediate frequency voltage 750 v electric shock risk. In the whole operation and inspection process, must pay attention to the safety operation, do not contact with the hand intermediate frequency electric cabinet.
19. In the process of sintering, induction coil, at any time from the furnace side hole to observe whether put arc phenomenon, if discovery is unusual phenomenon, should immediately report relevant personnel processing.
20. Start the vacuum butterfly valve should be slow, otherwise you will take oil by extraction, rapid, adverse consequences.
21. The correct use of rotary McLeod gauge, otherwise it will cause the vacuum reading error or mercury resulting from operation, rapid overflow caused by public nuisance.
22. Pay attention to the safe operation of the vacuum pump pulley.
23. In the vacuum sealing tape, cover furnace roof, pay attention to prevent pressure hand.
24. All that under the condition of vacuum, volatile affect vacuum health, pipes get clogged, or vacuum pump caused by dirty workpiece or container, not charging.
25. All products with forming agent (such as oil or paraffin, must take off before charging sintering, otherwise it will cause adverse consequences.
26. The whole sintering process, must pay attention to the water meter pressure range and cooling water circulation, so as to avoid an accident.

2016年10月8日星期六

Understand the high requirements of the high temperature vacuum furnace

High temperature vacuum furnace ironmaking automation is designed to make production process optimization, produce stable quality products and improve the process operator working conditions, this requires the technical and economic aspects of productive rationalization measures, in the process of ore smelting discount, physical and chemical changes very difficult to control thedifficult measurement.
More and more high mechanization degree of high temperature vacuum furnace, vacuum environment was does not have other forms of sintering (when the furnace vacuum degree is 1.3 * 10-1 PASCAL, remaining in the furnace gas purity argon 99.99987%); Vacuum sintering can make material before a liquid particle oxidation film completely ruled out, so as to change a good wettability of the liquid with carbide phase, to improve the alloy organization structure, improve the performance of alloy. Due to the vacuum press billet pore reduced the amount of gas in steel rolling workshop push by the steel type heating furnace of continuous development to all kinds of stepping type furnace, roller hearth furnace, furnace, chain furnace, etc.
Some within the chamber furnace heating shaped blank in the past, now change in annular furnace heating, productivity had the very big enhancement. The use of the electronic computer, the stove from loading assumed, paragraphs in the furnace temperature control, fuel and air traffic control, automatic control, furnace pressure until the steel material on time and discharging program operation, are given by computer control values, and be able to adopt the optimal control of the furnace condition, on the temperature of the steel material and the temperature difference at very accurately.

2016年9月29日星期四

Vacuum sintering furnace how to maintain

Vacuum sintering furnace is a by using high temperature heating equipment reduced the shape of an object or substance. It could reduce objects in space, grain boundary gradually gathered, solid particles gradually connection, so as to realize the density increases, the decrease of the object of the polycrystalline sintered body equipment.
So how should vacuum sintering furnace in peacetime to maintain?
1, equipment, warehouse, under the import and export of drive power warehouse to ensure clean without sundry.
2, vented with alcohol to clean the organic matter.
3, the main check each air holes inside the cavity is there a jam.
(4), tube if there are organic cotton non-woven or alcohol to wipe the washing can be used.
5, bevel net belt can transfer in 120 cases after baking soft shovel.
6, thimble net belt can be used sand paper burnish slowly, to prevent damage to the battery slice.

2016年9月26日星期一

Nitrogen sintering furnace using the matters needing attention

Compared with general electric, nitrogen sintering furnace is a kind of special electric furnace. Because it's filled with inert gas, nitrogen gas. And when in use will be special, the following is the safe usage of nitrogen furnace method.
1. Turn on the electric furnace, sintering furnace to nitrogen gas outlet connection mechanical pump.
2. Open the inlet valve, close vacuum pump power supply, open the valve, take time to corundum pipe and gas pipe.
3. When the furnace vacuum gauge to 0.1 (pointer to the end), close the valve and the inlet valve.
4. Turn knob counterclockwise to open the main valve, cylinders, turn knob clockwise slowly open the outlet pressure reducing valve, make the export pressure at 0.004 MPa.
5. Turn knob counterclockwise, slowly open the tube furnace inlet valve. The observation tube furnace barometer, confirm pressure below 0.08 MPa.
6. When pressure stable, closed tube furnace inlet valve and open the valve, vacuum to 0.1, turn off the air valve.
Above is the use of nitrogen furnace safety steps, it is important to note that good every link don't make a mistake, lest appear equipment failure.

2016年9月21日星期三

Nitrogen furnace development present situation and existing problems of interpretations

Nitrogen furnace is a kind of energy conversion equipment, to industrial furnace, the input of energy is the chemical energy of the fuel, electricity, high temperature flue gas heat and other forms, and after nitrogen furnace conversion, exporting has certain heat of steam, hot water or organic heat carrier. Refers to the literal meaning of the pot on the fire to heat the water container, furnace refers to the place of burning fuel, nitrogen furnace including boiler and furnace of two parts.
Nitrogen furnace industry is the important branch of the industrial machinery industry, occupying the important status in the machinery industry in our country. But due to the low level of domestic transmission machinery manufacturing, and have the core technology of the basic nitrogen furnace equipment in the hands of foreign enterprises, with the acceleration of foreign enterprises to enter the China market, new technology, new thinking constantly pounding industrial electric market in our country, draw lessons from foreign advanced equipment manufacturing technology alone, still can't catch up with foreign companies manufacture level.
At present domestic nitrogen sintering furnace industry manufacturers still attaches great importance to the busy "monkey" and "throats," clearly didn't establish a strong brand awareness, still stay in the development of the traditional industrial furnace equipment level cannot promptly carry out product innovation. Foreign enterprises always relying on excellent product quality, and strong brand awareness in the domestic market occupies the absolute competitive advantage.

2016年9月19日星期一

The effect of low pressure sintering furnace

Low pressure sintering furnace is compatible with the dewaxing, vacuum sintering, low pressure sintering, low pressure processing, multiple functions such as sintering atmosphere. Mainly used for: pressure before products of low pressure sintering; The low pressure processing of sintered products; The carbon sintering pressure products.
Low pressure sintering's main function is to reduce the microscopic pore in cemented carbide. The porosity of the sintered body in the vacuum sintering stage has been eliminated. Microscopic pore pressure stage mainly eliminated.
Low porosity is an important symbol of high quality hard alloy, try to reduce the porosity in the cemented carbide in the production, is one of the main pursuit of carbide workers.
Carbide densification and capillary force, the wettability of liquid phase for solid phase and the surface tension of the liquid has a close relation with the associated, as in the process of sintering temperature, when a liquid phase, due to the capillary pressure, the liquid phase to the surface of WC mobile, because the liquid has good wettability to WC phase, liquid phase was attached to the surface of WC, because the surface tension of the liquid phase, driven by liquid package WC mobile, strong contraction occurs at this point. In WC mobile liquid package, in the process of contraction, exists in the gas is out of briquetting, due to the flow of the liquid phase, a part of the porosity of the sintered body is liquid closed, with the augmentation of the contract, enclosed within the pore pressure, when the surface tension is equal to or less than the pressure in the pore, closed pore preserved in the alloy, microscopic pore space.

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