Vacuum Brazing Furnace: 2016

2016年12月30日星期五

Vacuum brazing furnace operation procedures

Before a furnace, vacuum furnace and ensure that water, electricity, gas in the assignments. In 380 v voltage, can not have the deviation of 10%. Pressure in 0.6 Mpa, the water pressure to the lowest (0.5 Mpa). Reach the above requirements to electricity, after operation.
Second, before feeding, check the equipment heating chamber, the heating chamber is necessary to clean, can not have sundry, dust, oil, water, etc. In view to put goods, dry cleaning, same before feeding the without watermarks, oil and other washing clean.
Third, after loading, the knob to the "door close" position. Then, a "mechanical pump" and "thick smoke valve". Of vacuum unit and the furnace smoke gas, opened the vacuum furnace with the power supply (general vacuum gauge power to launch with total power supply).
Fourth, when the vacuum degree higher than 1000 pa, vacuum gauge monitoring "J2" light. This time, can open "roots pump. Conditions such as, "roots pump" will not open, click on the button no response.

2016年12月28日星期三

Vacuum brazing furnace method has the following several kinds of classification methods

Selected for the quality of the vacuum brazing furnace and the brazing method and brazing material (solder, solder, etc.) and vacuum brazing furnace process parameters and so on. According to the different characteristics and standards, vacuum brazing furnace method has the following several kinds of classification methods.
(1) according to the adopted by the melting point of solder Can be divided into soft soldering and brazing, solder melting point is lower than 450 ℃ when called soft soldering, higher than 450 ℃ when called brazing.
(2) according to the brazing temperature Can be divided into high temperature soldering, brazing temperature and low temperature brazing, the division of temperature is relative to the parent metal melting point. For steel, for example, the heating temperature higher than 800 ℃, called high temperature brazing, called between 550 ~ 800 ℃ in the brazing temperature, the heating temperature is below 550 ℃ is called low temperature brazing; But for aluminum alloy, the heating temperature higher than 450 ℃, called high temperature brazing, called between 300 ~ 450 ℃ in the brazing temperature, the heating temperature is below 300 ℃ is called low temperature brazing.
(3) according to the different heat source and heating method can be divided into flame brazing, furnace brazing resistance welding, induction brazing and soldering, dip soldering, brazing, soldering iron and ultrasonic soldering, etc.
(4) according to the way of removal of the parent metal surface oxidation film can be divided into solder brazing, soldering flux soldering, the flux brazing, gas brazing and vacuum brazing, etc.
5. According to the joint formation characteristics Can be divided into capillary brazing and the capillary brazing. Liquid solder on capillary action fill in brazing seam is referred to as the capillary brazing; Capillary action in a vacuum brazing furnace form does not play a major role in the process is called the capillary brazing. Contact reaction brazing and diffusion brazing is the most typical of capillary brazing process.
6. According to the connection of different material or filler metals Can be divided into aluminum soldering, brazing of stainless steel, titanium alloy brazing, high temperature alloy soldering, brazing ceramics, composite brazing copper and silver brazing, soldering, etc.

2016年12月23日星期五

The realization of vacuum brazing furnace automation

Vacuum brazing furnace spray subject to the circular structure, surface passivation treatment, which ensure the beautiful appearance, also make soldering flux recovery effect is better, which can effectively prevent soldering flux, in the case of spray flux indoor accumulation, cleaning is also very convenient. Circular structure USES the real high pressure fan, pressure can reach 280 mbar, cooperate with special wind mouth, the wind speed can reach 50-200 - m/s, which can effectively remove redundant solder surface residues. Vacuum brazing furnace of a high degree of automation, below we come to the realization of the vacuum brazing furnace automation:
1, vacuum brazing furnace spray mixing system contains a lot of humanized design, solder recycling barrel equipped with filtering impurities, can filter most of the iron xu. Barrel designed deep barrel structure, which can effectively prevent solder overflow by stirring, and affect beautiful. Upper barrel equipped with omron level control, but the lack of liquid alarm.
2, the structure of the brazing furnace using fiber (cotton) around, verified by long-term considerations, insulation performance is better, can save heating time 2 to 3 hours, managing electric energy 10-20% while working for a long time, its main performance in response speed, low heat storage and heat preservation performance is good, had no effect on inflation, etc.
3, main part furnace brazing furnace, furnace is made of a 12 m in forming, namely only two side 2 weld, folding strengthen V groove at the bottom of the two.
4, slag removal chamber equipped with nitrogen gas preheating system, because there are high temperature slag removal chamber, in 500-600 ℃, when not being used, the high temperature also need emitted, resulting in energy loss. Now through slag removal chamber, internal installation scattered tropical, nitrogen cycle special process structures, such as nitrogen can be preheated to 350-400 ℃, and indirectly reduce the brazing furnace to nitrogen loss to the heat and power consumption.
5, for the energy-saving design of nitrogen, nitrogen losses mainly in the feed port and discharging port, how to ensure that the nitrogen loss is the key to save the nitrogen. Regular design can make the nitrogen from metal curtain on both sides of the overflow, metal curtain roll after using for a long time will appear, cannot achieve the desired effect. Now my company through from the top insert metal curtain, and high temperature polyester cloth, make furnace at two sides with the metal curtain connecting more closely, metal curtain after using for a long time will appear curly, but we have high temperature polyester cloth, outer spillover will still blocked the nitrogen.
6, fully automatic electric control system, two undisturbed switching procedures manual and automatic mode, can accurate records of each area of temperature curve, can copy computer analysis with EXCEL at the same time. The procedural control of the brazing furnace, can be very convenient setting the heating time, needed to make a contribution to protect the furnace. In view of the different temperature requirements of different products, with a key switch technology products, and other functions. Touch screen for each line, motor, temperature control, frequency converter fault for real-time monitoring, timely detection alarm in time, and in the form of Chinese display and storage.
7, remote control function, in the case of equipped with cable, can use the computer, mobile phones connected to the touch screen in real time, can see or remote control, also can be used as a remote maintenance. Brazing furnace main parts can also be video view (optional).

2016年12月19日星期一

The reliability of the vacuum brazing furnace

Vacuum brazing furnace according to maintenance schedule should be regularly to listen to correction and cleaning tape type furnace temperature recorder, check the workpiece, thermocouple and vacuum degree. By the wear and car dust between the electromechanical device, may count is not correct, cause the brazing operation. Mass production and repeat a user for the workpiece temperature of the thermal cycle of control, can be controlled by electric furnace thermocouple, the workpiece temperature measurement is required, clear electric thermocouple and the brazing temperature can be the difference between the actual temperature.
If all other conditions, including the amount and type of parts are the same, using electric thermocouple temperature on behalf of the workpiece temperature usually is practical. But the data reliability depends on daily on a regular basis to detect temperature and still need to confirm for a vacuum brazing furnace temperature is. Continuous consistent.

2016年12月15日星期四

Vacuum brazing furnace product use and structural features

Vacuum brazing furnace product use: can be used for alloy steel, tool steel, die steel, high speed steel, bearing steel, spring steel, stainless steel materials such as bright quenching, annealing, or magnetic material sintering, or high temperature brazing and other details Can be used for aluminum alloy low temperature vacuum brazing, silver brazing temperature in copper, or stainless steel high temperature brazing. Suitable for: aluminum alloy or stainless steel radiator, evaporator, condenser, and large aluminum alloy plate heat exchanger of air separation industry.
Structure point: adopt more district heating automatically control, furnace temperature uniformity can reach more than + / - 3 ℃. Strong external circulation cooling system can be configured according to need, greatly improve production efficiency. Equipment the overall high reliability, long service life, performance reached modern advanced level of similar foreign equipment. Maximum effective heating area can do 8 m * 1.55 m * 1.55 m, a furnace charging quantity 18 tons. Electric control system of main control instrument and device USES imported product, with advanced computer control system.

2016年12月12日星期一

The vacuum brazing furnace

1) completely eliminates the oxidation and decarburization on the surface of the workpiece during the process of heating, clean surface without metamorphic layer can be obtained. That only when grinding mill side of cutting tools (such as twist drill grinding after make direct exposure to edge) of the decarburization layer of the grooved surface cutting performance greatly improved relations.
2) on the environment pollution-free, "three wastes" treatment is not required.
3) obviously improve the temperature measurement, the monitoring precision. Indicated value of thermocouple temperature and furnace temperature reached plus or minus 1.5 ° c. But in different parts of a large number of artifacts in the furnace temperature difference is bigger, if USES the rarefied gas forced circulation, can still be controlled within + / - 5 ° c temperature difference.
4) high degree of mechanical and electrical integration. Increase in the temperature measurement and control accuracy, on the basis of the workpiece moving, pressure adjustment, power adjustment, etc all can set programming in advance, according to the steps to implement the quenching and tempering.
5) energy consumption significantly below the salt bath furnace. Modern advanced vacuum brazing furnace heating chamber is made of high quality insulation material of insulation walls and barriers, electric energy can be highly focused on indoor heating, energy saving effect is remarkable.

2016年12月8日星期四

Continuous high temperature brazing furnace working principle and composition

High temperature continuous brazing furnace is the decomposition of ammonia decomposition equipment out of hydrogen after purification of hydrogen nitrogen mixture as protective atmosphere under the influence of continuous brazing and bright annealing of special equipment, main use: iron base, copper base workpiece workpieces, continuous brazing of stainless steel workpiece and light processing.
(1), continuous brazing furnace parts:
The equipment by the actuator (feed), the preheating section, heating furnace, cooling section, driven organization (discharge), sea pneumatic control system, electric control system and liquid ammonia decomposition furnace, etc.
1, the working principle of the
Work-piece with stainless steel mesh belt transmission, placed on the mesh belt, from the preheating section inlet, through the mesh belt transmission, through preheating, heating, cooling (solder melting). From cooling period of discharging of artifacts within the muff ruler is pure hydrogen gas protection, due to the reducing hydrogen gas, make the product surface bright, no oxidation. Artifacts is welded by heating the workpiece, melt filling material (solder), using capillary action to make liquid solder filling the space between the parent metal, welding after cooling to achieve.
2, work process
Manual feeding to mesh belt transmission, the preheating section - mesh belt transmission - heating section (solder melting) - > mesh belt transmission to cooling section, manual

2016年12月4日星期日

Vacuum furnace - good protection maintenance methods

Vacuum furnace - good protection maintenance methods:

1) the pump protection maintenance, please see the detail its use manual;
2) vacuum furnace for a long time need not when, it is necessary to properly keep the system with cooling water should be put on net. Especially in the winter should adhere to the indoor temperature above 10 ℃, smooth with antifreeze bad equipment and adhere to the outstanding conditions;
3) work to introduce choose 46 anti-wear hydraulic oil, oil using oil temperature within 15 ℃, 60 ℃;
4) the oil should be consented to enter the tank after strict filtering;
5) oil each replaced once a year, for the first time in the replace time shall not exceed three months;
6) check check once every six months pressure gauge,
7) the machine is stopped for a long time, the processing appearance should be wiped clean and coated with anti-rust oil.
8) don't know the structure of the machine function or procedure should not private line to start the machine;
9) machine in the process of operation, should not be for maintenance and adjustment mould;
10) when machine found serious leak or other abnormal (such as the action is not reliable, large noise, vibration, etc.) should be parking analysis reason, try to wipe out, not being put into production.
11) shall not be overloaded or beyond the maximum offset distance use;
12) vacuum furnace for a long time need not when, vacuum box should be insured deposit under the vacuum condition, all equipment cooling water should be put on net. Especially in the winter should adhere to the indoor temperature above 10 ℃, smooth with antifreeze bad equipment and adhere to the outstanding conditions;
13) before beginning each technical process, should be measured a heater resistance and insulation resistance to ground, ensure no short circuit, open circuit representation;
14) regularly check system all wiring is loose or break line, such as found that should tighten loose place, will break from cohesion;
15) heating chamber, such as attack damage need to replace, otherwise the heat preservation effect;
16) to check the electric control cabinet back each relay is instrumentation, such as loose surface are detected, should be timely put tight;
17) time to arrange, electric control cabinet to remove adherent dust, crushed, metal scraps, etc., don't make it work for a long time in high temperature, moisture, dust pollution environment;
18) claims that did not work, please send electric control cabinet back all the status of the circuit breaker from ON to OFF, or directly closed the total power, avoid shock disturbance;
19) using the touch screen, pay attention to the operation process, avoid the wrong operation; Touch screen together to gently, avoiding the damage to the screen.

2016年12月1日星期四

The realization of vacuum brazing furnace automation

2016年11月28日星期一

Removal of vacuum aluminum brazing furnace oil need to pay attention to the problem

1, to 400 degrees Celsius temperature quickly, in order to reduce the diffusion brazing junction silicon, is helpful to ensure the quality of joints. As this is aluminum brazing process requirements, must do it.
2, then take a slow long natural cooling, this step is to cleanse sandstones from fouling. At this time due to the furnace with nitrogen gas, waste heat by the cycle of nitrogen} L conduction, radiation to heat was less than the adsorption with the cold components of oil pollution. The temperature of these artifacts usually only tens of degrees, in the process can increase to 200 degrees Celsius, so as to achieve its evaporation table and pollution of the day.
3, the next coarse vacuum, one party but would have vaporized oil steam out of furnace chamber, prevent again by adsorption after cooling, the other party and, in the crude oil evaporation under vacuum environment will be more thorough. Diffusion pump no need to open, because when pressure drop to 10 pa, more than 99.99% in furnace gas has been pulled out.
4, closed cooling water of furnace wall, furnace door is to reduce heat loss, is more advantageous to raise the temperature of furnace wall. However, because the diffusion pump need cooling of equipment, can't stop water cycle system.
5, and other issues
Through such processing, baffle plate and oil base on some of the heat capacity of the smaller components can be cleared away. Wall due to the heat capacity, although closed cooling water in advance, but still kept cooling water increase the heat capacity of National People's Congress, the temperature is still rising gao, clean from the effect of oil pollution is the worst. So, in the final need to j ping work cleaning furnace wall. Because the oil is accumulated for a long time, the oil will stick with dust, is can't use this method to remove dust, oil pollution has been removed, the remaining dust adhesion is not strong, can use a vacuum cleaner to clean up, or use the clean compressed air to blow away. Can't clean the furnace wall and the last to do that, and heating evaporation, and there will be some oil vapor by adsorption. When removing dust will be, ash, _ stick. So the wall should be on the final wash clean.

2016年11月24日星期四

Vacuum brazing furnace mainly Outlines and performance

Vacuum brazing furnace in vacuum arc of high temperature melting can make metal degassing, oxygen, and the process of removing impurities, pure metal billet is achieved. Under the action of molten metal in the water cooled copper crucible cooling solidification, as a result, high melting rate and the precise control of arc heating area, can guarantee the consistency of the direction of the molten metal solidification, and prevent solidification macro segregation and reduce the number of micro segregation, greatly improving the solidification of the ingot metal performance.
Vacuum furnace is through the material or parts under the vacuum state according to the technical process heating, cooling, to achieve the expected performance of a process. Vacuum furnace Namely in the condition of vacuum, heating up a set of components to the filler metal melting point temperature above, but below the substrate metal melting point temperature, with the aid of filler metal to wet and flow of metal in the matrix form of weld a welding process. (brazing temperature in different material varies) vacuum furnace under vacuum condition, heat the metal powder products, make the adjacent metal powder grain by adhesion and diffusion effect and a method of burn into parts. Vacuum furnace Mainly applied to metal materials and magnetic treatment.

2016年11月21日星期一

Simple understanding of vacuum brazing furnace

Everyone's understanding of vacuum brazing furnace how many? In order to make people more about the product master, we'll give you a brief introduction of below!
Vacuum brazing furnace is the large-scale equipment, heat treatment can be vacuum brazing, vacuum annealing, vacuum aging and other processing. Programmable multiple different procedures, it can control and into hundreds of heat treatment curve points, six points up, down, left and right sides, front and rear area temperature control, there are more and single point temperature recorder and over temperature protection device, furnace temperature uniformity can be controlled in less than 3 ℃, the other with the installation of high purity nitrogen high flow of strong cold.
The equipment has a large amount of furnace charging and high efficiency, have special request for complex parts and parts no need for supplementary processing products.

2016年11月17日星期四

The use of vacuum brazing furnace in good condition

Using gas, liquid hydrogen through outdoor of finned tube evaporator liquid tank evaporation, and concession road into large indoor air tank, in the furnace need to provide a large number of gas during the forced air cooling. Although gas supply manufacturers in the liquefied gas tanker exit gas purity of 9.998%, but according to the requirements of technical conditions should be checked at the entrance of each furnace gas dew point.
Asked dew point average for a 65 "F (18 ℃). Every six months a leak test should be made for the whole system to the root to the end, the vacuum brazing furnace running just is the result of users continuously maintained. In today's world, success is only a compromise between the gain and loss and efficiency. Users are concerned about the vacuum brazing furnace good used condition.

2016年11月16日星期三

The main technique index of vacuum brazing furnace

Vacuum brazing furnace is mainly used to apply in cars, planes, ships, compressors, air separation equipment, carbide, diamond, household appliances, such as all kinds of heat exchanger, oil cooler and a variety of vacuum brazing of the antenna, electronic communication components, application scope is broad, the following is to tell everyone about vacuum brazing furnace equipment main technical indicators:
1, the furnace type: single room, horizontal.
2, the workspace: 900 (L) x 600 (W) x 600 mm (H).
3, charge: 500 kg/furnace (fixture).
4, the highest temperature: 1320 ℃.
5, the ultimate vacuum: 6 x 10-4 pa (empty furnace, cold, the purification).
6, pressure rise rate: < 0.2 Pa/h.
7, temperature uniformity, plus or minus 3 ℃ or less.
8, the temperature control precision: + / - 1 ℃ or less.
9, charging ways: hydraulic forklift.
10, heating power: 150 kw.
11, no-load heating time: from room temperature to 1320 ℃ for 30 minutes or less.
12, the maximum cooling pressure: 2 bar.

2016年11月13日星期日

Vacuum furnace exquisite workmanship

Vacuum furnace play an irreplaceable role in mold production, mainly used in ceramic sintering, vacuum smelting and electric vacuum parts in addition to gas, annealing, brazing of the metal, and ceramic to metal seal, etc.
Vacuum furnace vacuum heat treatment can achieve almost the entire heat treatment process, such as quenching, annealing, tempering, carburizing, nitriding, during the quenching process can realize gas quenching, quenching oil, water nitrate quenching, quenching, etc., can also be vacuum brazing, sintering and surface treatment, etc. Vacuum furnace thermal efficiency is high, which can realize the rapid heating and cooling, which can realize no oxidation and decarburization, carburizing, can remove phosphorus crumbs on the surface of the workpiece, and has the effect such as degreasing degassing, so as to achieve the surface brightness purification effect. Generally speaking, the processed workpiece in the heating furnace is slow, and internal temperature difference is small, the thermal stress is small, so little deformation. Product qualified rate is high. Can reduce costs, have degassing effect, so as to improve the mechanical properties of the work and life. Good working environment, safety operation, no pollution and no pollution. Be processed workpiece no hydrogen embrittlement risk, to prevent surface of the titanium and refractory metal shell hydrogen embrittlement, stability and repeatability of vacuum heat treatment process. A series of advantages, the development of vacuum heat treatment equipment and technology is more and more attention and applied more and more widely.
Two professional vacuum heat treatment of vacuum technology and heat treatment technology that combines an integrated, refers to the whole and part of heat treatment process in a vacuum. Our country could be divided into low, medium and high vacuum and high vacuum.

2016年11月10日星期四

Aluminum brazing method

An aluminum or aluminum alloy in the drying chamber, greenhouse, brazing room, through a continuous furnace cooling chamber, etc and make molten solder curing on the part of brazing method, its character is that: in the drying chamber in flux coating chamber, abut the flux coating chamber set flux generating device, set 30 ~ 46 in the flux generating device (weight) % AlF an aluminum or aluminum alloy in the drying chamber, greenhouse, brazing room, through a continuous furnace cooling chamber, etc and make molten solder curing on the part of brazing method, its characteristic is that; In the drying chamber in flux coating chamber, abut the flux coating chamber set flux generating device, set 30 ~ 46 in the flux generating device (weight) % ALF left [3] powder and 70-54 (weight) % K left [3] ALF left [6] powder in the presence of water to form water crushing after suspension, adjust the concentration of the waters suspension mixed powder into the water 95 ~ 90% 5 ~ 10%, and in the flux coating chamber the coating on the aluminum parts.

2016年11月9日星期三

Brazing furnace production using tips

Brazing furnace, although is not very complicated industrial machinery and equipment, but also has a lot of skills in use process need to master and make processing, according to the situation of or produce a product quality may not be qualified. In general, brazing furnace production need to be considered in furnace structure, furnace temperature, heating process, many aspects, such as furnace atmosphere, these aspects will directly affect the production of the quality of the products. Vacuum furnace production using tips
The use of the brazing furnace also has a few tricks, for everybody simple introduction a few below:
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 proce ss 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.
In order to get smooth surface and dimension precision of artifacts, or to reduce the metal oxide to achieve protection mould, reduce machining allowance, etc, can be used in a variety of no less oxidation furnace. Within the open flame less, no oxidation furnace, reducing gas generated by the incomplete combustion of fuel in heating workpiece can make oxidation burning loss rate is reduced to below 0.6%.

2016年11月3日星期四

The vacuum brazing furnace maintenance conditions

Vacuum brazing furnace used in need of good maintenance and maintenance, so how to do daily maintenance work? Weifang vacuum furnace manufacturers today sent gold belt together to look at.
(1) the operator to understand all sorts of appearance, pump, all the parts of the equipment. Read and understand all kinds of specifications.
(2) the cooling water pressure should be between 0.1 ~ 0.2 Mpa, the water temperature is 45 ℃ or less.
(3) compressed air pressure is between 0.4 ~ 0.5 Mpa.
(4) before starting each furnace, to see the maintenance of gas cylinder capacity, to avoid the lack of gas filling, change of gas cylinders.
(5) after startup if any abnormal situation, should immediately remove or stop to find the reason.
(6) often see the back of each part of water, shall ensure that the parts have enough cooling water when working.
(7) when they stop using the equipment should be in furnace gas evacuation, not for a long time, to fill the gas maintenance, equipment in the water jacket of circulating water and put out.
(8) mechanical pump, roots pump should be regularly in oil gas, roots pump oil cup to have oil. When an oil change is bound to put the waste oil clean.
(9) pump oil change, internal oxidation, if any, to the dispersed pump internal oxidation layer disposal clean, then put on the new oil.
(10) the maintenance of filling the gas, the purity should not be less than 99.99%.
(11) of this equipment is not allowed to use flammable and corrosive gases as maintain atmosphere.
(12) equipment looks and appearance they stick to clean, scrub with water and furnace wall are not allowed to have with the vacuum type oil rag scrub.
(13) pneumatic system of pneumatic even three pieces of the oil-water separator to often water, oil mist device should be written to the scattered vacuum pump oil.
The machine voltage (14) equipment to ensure that in the range of 350 ~ 420 V. Three phase equilibrium.
(15) gauge, electric contact pressure gauge, the place such as thermocouple is often coated with scattered oil pump, to that of the bridge between form a layer of oil film, avoid air leakage. The above parts and flange joints are not allowed to use vacuum cement seal for a long time.

2016年10月31日星期一

Really empty brazing furnace maintenance and maintenance work

1, vacuum brazing air quenching furnace after the furnace, furnace domestic demand remain below 66.5 LPa vacuum.
2, inside furnace dust or not clean, soak through application of alcohol or gasoline silk cloth to wipe clean and dry.
3, furnace sealing structure of the vacuum system components such as tear open outfit, alcohol or gasoline clean and after drying, vacuum grease on besmear put on.
4, vacuum quenching furnace stove outside surface often wipe, running clean clean.
Parts and car parts should be clean, dry rear can into the furnace, prevent moisture, dirt from entering the furnace.
5, the transmission parts found screens, limit, control failure phenomenon, should immediately end of the line, don't strong operation, so as not to damage parts.
6, mechanical transmission parts should be lubricated periodically or oil changes and maintenance.
7, vacuum pump, valve, measuring instruments, thermal instrumentation, electrical components and other accessories, all in accordance with the technical specifications of the products to be repair and maintenance.
8, maintenance operation should be performed in the case of power failure. Under the condition of charged for repair, must ensure the absolute safety of person and equipment.

2016年10月26日星期三

The importance of the theory of vacuum brazing furnace cooling system

The vacuum gas quenching furnace with graphite heater heating way, by the body, vacuum system, water system, air system, startup system, electric control management system and so on several parts of structure.
In close to a vacuum brazing furnace heating by electric heating element, and has important effect on the service life of furnace body cooling system. Work condition cooling water channel should be kept unobstructed, avoid water temperature rise the phenomenon of downtime impact production schedule.
If water cooling system disorder, vacuum furnace heating system after long use a contraction harden etc. Phenomenon, serious still can appear short circuit phenomenon, reduce the service life of the furnace body is normal. So attention should be paid to the use of the cooling system maintenance, reduce sediment accumulation in the piping and water jacket, keep the water flow.
Periodically maintenance care, once appear, loss of expensive machines burning phenomenon, also prone to accidents, so the cooling system normal operation of the staff to ignore.

2016年10月23日星期日

Vacuum furnace has so many functions

Vacuum boiler is in a closed furnace internal form a negative pressure of vacuum, filling heat medium water in the body. By burning heating heat medium water or any other way, again by heat medium water evaporation, condensation and heat exchanger, again by heat exchanger to heat to heat water.
Vacuum boiler heat conversion signal:
Oil, natural gas, gas, electricity - > combustion heat (electric conversion) - > heat medium water - > after boiling steam condensation heat transfer of -- -- -- -- > > heat exchanger heat transfer > water
Vacuum boiler working principle: using the characteristics of low water under the condition of low boiling point, rapid heating sealing furnace heat medium filled in water, high temperature steam, the heat medium water boiling evaporating out water vapor condenses on the heat exchange tube heat exchange tube in cold water, hot water supply.
Vacuum boiler by pumping air into vacuum state, almost no air to form a low pressure environment, and then use water (less than atmospheric pressure) under low pressure low temperature steam boiling, soda condensation heat transfer way will work the principle of heat output.
Vacuum heat medium boiler water is after deoxidization, descaling and other special processing of high pure water, a filling to complete before they go out, when used within the unit closed cycle (vaporization and condensation and evaporation), does not increase, not decrease, in unit service life does not need to supplement or replace.
Therefore, the vacuum inside the boiler furnace will never scale, corrosion, normal service life can reach more than 20 years, far more than ordinary hot water boiler the service life of 10 years or so.

2016年10月19日星期三

Pump vacuum brazing furnace temperature is too high

Vacuum brazing furnace will inevitably be in the process of using all kinds of fault, pump vacuum brazing furnace temperature is too high? The following vacuum furnace manufacturers to share the solution.
(1) check the thermostat setting of the temperature control pump is in accordance with the regulations. If not, should be reset.
(2) pump cooling water flow rate of solid scale or other dirt jam for smaller. Lead to rising pump Yun. Because oil pump must have certain viscosity to ensure the sealing of pump. The viscosity is too small, the sealing performance variation. And pump oil viscosity with temperature rise and fall. The sealing of pump, oil saturation vapor pressure increases, vacuum degree reduced. Solution is to dredge waterways. Increase the flow of cooling water, the temperature of the oil pump shall not exceed 0 ℃ o l e., it is about 0 ℃.
(3) components assembly is undeserved, cause wear and tear, should be reassembled.

2016年10月17日星期一

In the brazing furnace parts carburized control method

Parts carburizing in the brazing furnace control method, when the carbon carrier of hydrocarbon gas into the vacuum furnace, this method is available to control. Respectively under vacuum and negative pressure carburizing is known to all. Available hydrocarbon gas as gas carburizing agent, and the most common is methane. In certain furnace gas composition is known, is CH 'and N:, for example, or CH' + CO N: 10, a H:. Using these methods, because between the gas and carbon amount carburizing steel need not form a chemical equilibrium, so the oversupply in the gas carbon measures must be taken, for example through supply 0 h4. The necessary of excessive hydrocarbon gas supply has a weakness, is in the reaction process has yet to reach the free carbon occurs on the surface of the steel, such as the reaction of methane CH '= C + useful: black carbon is produced by this kind of free carbon and, with the concentration increased, the carbon black into carbon black cloud and visible.
It has two drawbacks: first, obstruct carburizing; Second, the pollution is carburizing and furnace. In addition and cause the danger of short circuit in the electric heating furnace. In order to reduce the carbon black, already use fixed pulse or how many according to adjust the way of pulse, quantity and time on the amount of hydrocarbon gas supply vacuum furnace control. But this method cannot obtain the effective results, and for the formation of infiltration layer depth and some inadequacies in the border carbon content, in order to get better comprehensive effect related to the carbon black form, the need for most different carburized parts determined by pulse test procedures. Therefore, only do a lot of testing under different conditions.

2016年10月13日星期四

Vacuum brazing furnace operation procedures

First, before the vacuum brazing furnace blow-in, ensure that water, electricity, gas in the assignments. In 380 v voltage, can not have the deviation of 10%. Pressure in 0.6 Mpa, the water pressure to the lowest (0.5 Mpa). Reach the above requirements to electricity, after operation.
Second, before feeding, check the equipment heating chamber, the heating chamber is necessary to clean, can not have sundry, dust, oil, water, etc. In view to put goods, dry cleaning, same before feeding the without watermarks, oil and other washing clean.
Third, after loading, the knob to the "door close" position. Then, a "mechanical pump" and "thick smoke valve". Of vacuum unit and the furnace smoke gas, opened the vacuum furnace with the power supply (general vacuum gauge power to launch with total power supply).
Fourth, when the vacuum degree higher than 1000 pa, vacuum gauge monitoring "J2" light. This time, can open "roots pump. Conditions such as, "roots pump" will not open, click on the button no response.
Five, when the vacuum degree is higher than 7 pa, vacuum gauge monitoring "J1" light. Level before this time, open the "valve" and "scattered pump". For preheating scattered "pump".
Six, to be scattered "pump" preheating time arrive 90 minutes time (on the counter investigation touch screen), closed "thick smoke valve", opened the "high valve", the high vacuum chamber of a stove or furnace.
Seven, when after the vacuity of the vacuum chamber of a stove or furnace to operations (vacuum gauge monitoring "J3" light up, pay attention to the initial monitoring set is higher, can set may be arrived at the required vacuum, heating) to open, open the heating and temperature control table with the initiative launched operation (heating curve should be ready in advance).
Eight, heating, heat preservation whole process has been completed, "process completed" alarm, together, closed heating the initiative.
Nine, if choose natural cooling, let vacuum furnace equipment remains the same, for natural cooling equipment to the melt temperature, closed "high valve", "dispersed pump" and "roots pump", leaving only "mechanical pump" and "the former valve" to vacuum pump "dispersion" and cooling. Together to beat knob to the "door open" position. In a closed vacuum gauge, opened the "manual vent valve", were deflated, stay in furnace pressure and atmospheric pressure balance, oven door open, can take is expected to tighten together "manual vent valve". To be scattered "pump" temperature cooled to room temperature (about one hour), can be closed "mechanical pump" and "the former valve". Closed water, electricity, gas. Finished the whole process.
Ten, such as selection of strong cold, in step 8, closed "gauge", "high valve", "thick smoke valve", "pump" scattered, leaving only "mechanical pump" and "the former valve" to spread to vacuum pump and cooling. "Charging valve" in turn, to the furnace into nitrogen maybe after argon to basic balance and atmospheric (with a pressure gauge control fan start testing point and inflatable limit testing point), open air cooler, until cool to melt temperature (strong cold air is in the process of active control). Enclosed the "charging valve. After cooling to the melt temperature, the knob to the "door open" position. And then unscrew the manual vent valve inflatable to balance and atmospheric, oven door opened, and then screw down the "manual vent valve". Then in the discharge. Closed water, electricity, gas. Finished the whole process.

2016年10月11日星期二

In so doing, the vacuum brazing for longer service life

1, according to the PLC program of low vacuum, closed all the double chamber vacuum valve of high-pressure gas quenching furnace, start the mechanical pump, after waiting for its running normally (about 1 to 2 min), open to the furnace of low vacuum valve disc valve, in advance of furnace smoke low vacuum;
2, according to the PLC program, high vacuum, open the valve disc, the diffusion pump suction, after 15 Pa under vacuum, the system automatically open to preheat diffusion pump, diffusion pump in about after 45 min started its function, can closed on disc valve, at the same time open the main stop valve for vacuum degree of 1.33 x 10 Pa, the samples can only open the heating button to heat.
Vacuum brazing maintenance guide equipment operators within the scope of responsibility of equipment point check parts, with the right inspection methods and tools based on the tally equipment daily maintenance cycle; The operator according to the daily maintenance manual fill in the heat treatment equipment daily maintenance records, and check by the team leader review, maintenance man to collect the archive. According to the technical requirements after the installation of complete equipment, perfect and has a good grounding, debugging and acceptance in accordance with the following items.

2016年10月8日星期六

Maintenance of vacuum brazing furnace

Continuously operating on a daily basis - with no filler metal with vacuum brazing furnace to various parts of the vacuum brazing furnace, inevitably lead to some vacuum brazing furnace charge fly all the damage to the heating elements and heat shield. If not timely maintenance, vacuum brazing furnace metal deposition, will soon be corrosion damage to the heating element, or produce local overheating, or make the heating system is broken one or more of the phase. That leads to the temperature of the inhomogeneity, in batch vacuum brazing furnace production, this kind of situation is often not noticed. Heating element of repair is the easy, it is not the same as heat insulation screen damage.
If heat insulation screen USES the key persons, as long as the screen with a thin layer of ink stone protection can make the vacuum brazing furnace metal splash damage down to the most. Vacuum brazing furnace metal and graphite surface wetting and bonding, not simply in the form of beads drops roll to the cold of the furnace area. After completion of these particles in a vacuum brazing furnace, also not harm can easily be removed.

2016年9月28日星期三

The hot wall vacuum brazing furnace type

Hot-wall vacuum brazing furnace used than the parent metal of low melting point metal materials as solder, use liquid solder wetting fill material and workpiece interface gap and make it with the parent metal diffusion welding method. Suitable for welding precision, complex, and composed of different materials.
According to different welding temperature, the hot wall vacuum brazing furnace can be divided into two broad categories. Welding heating temperature below 450 ℃ is called soft soldering, higher than 450 ℃ is called the brazing. Soft soldering used in electronic and food industries more conductive, airtight and watertight devices of welding. In a tin lead alloys as solder tin welding is the most commonly used. Soft solder generally need to use solder, to remove oxide film, and can improve the wettability of solder. Flux is a lot of more phyletic, the electronic industrial use of rosin alcohol solution soft soldering. The solder residue after welding workpiece non-corrosive effect, called no corrosive soldering flux. Welding flux used in materials such as copper, iron, the zinc chloride, ammonium chloride and vaseline, etc. The need when welding aluminum with fluoride and fluorine boric acid salt as flux, and hydrochloric acid and zinc chloride as flux, etc. The solder residue after welding have corrosion effect, called the corrosive soldering flux, must be cleaned after welding.
Braze welding head high strength, can work under high temperature. There is a wide variety of brazing filler metals, aluminum, silver, copper, manganese and nickel as the base of the most widely used solder. Aluminum solder used in aluminum brazing. Silver base, copper base filler metals are often used for brazing of copper, iron parts. Manganese and nickel based solder used to weld more working under high temperature, such as stainless steel, heat-resistant steel and high temperature alloy parts. Welding of beryllium, titanium, zirconium and other refractory metals, graphite and ceramic materials are commonly used palladium base, zirconium and titanium based solder, etc. The characteristics of the parent metal and should consider when choose solder joint performance requirements. Brazing flux are usually made of alkali and heavy metal chloride and fluoride, or borax, boric acid and fluoboric acid salt, etc, can be made into powder, paste and liquid. Join in some solder lithium, boron, phosphorus, to enhance its ability to remove the oxide film and wetting. After welding flux residue rinse off with warm water, citric acid or oxalic acid.

2016年9月26日星期一

Removal of vacuum aluminum brazing furnace oil need to pay attention to the problem

2016年9月21日星期三

Vacuum brazing furnace mainly Outlines and performance

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