Vacuum furnace don't like to "eat" what material?

Vacuum furnace don't like to "eat" what material?

Vacuum furnace is widely accept metal materials, but because of many reasons resulted in the vacuum furnace is unable to process the materials, such as in the technical requirements, need to cost, there are some difference on the craft, vacuum furnace that what kind of material is not "eat"?
Carbon steel, carbon steel price under other steel products, and finished product price is not high also, if there is no allowance is not highly profitable materials or materials processing, forced from cost to consider, or do not use vacuum furnace is better, because the cost of the vacuum furnace is far higher than that of carbon steel prices, really isn't worth while.
N elements: using high temperature materials processing of n elements, not only can produce harmful products material and the sensitivity of the high temperature of n elements is too high, alloying elements using vacuum furnace processing in order to prevent metal material to send out at high temperatures, so generally will be under the condition of high temperature high purity nitrogen partial pressure, cooling using nitrogen charging way, so unfavorable use vacuum furnace.
Special materials: some special material in order to achieve the result that you want to use high temperature processing, some materials need to obtain bainite, some are to get good mechanical properties, isothermal quenching can be used to reach the effect, but the vacuum furnace to achieve some special material of hot working, although with high-pressure gas quenching vacuum furnace for high hardness for Ms points under cold temperature speed faster, will be large deformation effects.

The correct use and maintenance of vacuum brazing furnace

The correct use and maintenance of vacuum brazing furnace

The popularity of vacuum brazing furnace good for users and manufacturers are, at present, the selection of the furnace has a lot of, vacuum furnace product has a lot of flooding the market. Vacuum brazing equipment is usually automatic feeder, automatic, don't need too much by the face or training can master operation.
In fact, vacuum protect operators just invited to keep strict operational procedures, press the button at the appropriate time and switch operation. In addition to the load, operation, unload and equipment function abnormal notify maintenance personnel, operators do not need to do any work. Unlike machining machine tool, do not need to change tool, also need not to lubricating oil on the parts. For new users, however, these terms and conditions are easy to be misunderstood, also easy to cause a false sense of security, will be until the time when forced, to apply for maintenance. Vacuum processing specialization brought less experienced users new maintenance problems. The vacuum brazing furnace used for brazing is bigger than abrasion is only to be used in heat treatment. If not for preventive maintenance, new stove will soon appear all sorts of problems, discontinuation of vacuum furnace.

Vacuum brazing furnace operation procedures

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.

To avoid contamination of vacuum brazing furnace

To avoid contamination of vacuum brazing furnace

Before getting into the vacuum brazing furnace, after waiting for welding of all zero, components should be properly cleaned and cleaning methods available skim acetone cleaning, ultrasonic cleaning or dry grinding (such as glass abrasive). Artifacts pre-cleaning is just to keep the design features of the vacuum brazing furnace systems of the first step. Assume that brazing furnace is clean, and all the operation steps in line with the provisions, cleaning the workpiece in advance is a vacuum brazing guarantee of success. However, if the previous in the impurity artifacts, causes pollution of the stove, and do not pay attention to when using or misuse, as you might expect, the brazing wouldn't have succeeded. Many operators made vacuum brazing furnace, heat treatment, because residual hydrocarbons, workshop is contained in the dirt and high vapor pressure elements of improper cleaning artifacts but often neglected effect of the vacuum furnace pollution sources, these things will be condensed in the cold area of the stove, in the high temperature again into the surrounding environment, and thus affect the brazing quality.
Casting of vacuum brazing furnace pollution is serious, in repeated process, casting is deflated, will soon be on the same furnace brazing happened impact on the quality of components. Do this too often leads to expensive overhaul and internal heating zone components clean or redo. The degassing of any materials should be completed in a vacuum, and should not be done in vacuum brazing furnace. Zinc, cadmium and lead the brazing filler metal should avoid to use, or only in argon or nitrogen partial pressure higher than 500 um, temperature below its vapor pressure under the condition of use, should try to avoid using flux.

The parts of the vacuum brazing furnace need cleaning steps

The parts of the vacuum brazing furnace need cleaning steps

Vacuum brazing furnace need cleaning components in (1) first trough soaking in the preheating, again in ultrasonic cleaning tank (2) cleaning, use of ultrasonic cavitation effect to accelerate the pollutants dissolved and dissection, then rinse in cold rinse tank (3) by ultrasound, rinse off residual dirt, and make the workpiece cooling, the bigger the temperature difference between workpiece and solvent vapor is more conducive to the condensation, vapor phase cleaning effect is better. Finally in the solvent vapor layer (bath wash tank) RGL, rinse hot solvent vapors generated encounter cold condensation, solvent vapor into liquid, wetting, dissolve the contaminants on the surface of the workpiece, and like rain drops, and take away pollutants.
When the workpiece temperature of solvent vapor temperature, condensation, no longer no longer drops on the surface of the parts, said end of vapor phase cleaning. Finally, the workpiece is put forward to leave vapor layer to the frozen area, artifacts slightly stay which is completely dry. Because the steam is clean, clean process without secondary pollution, so it is a completely clean cleaning process, can achieve very high cleanliness.

Vacuum brazing furnace operation procedures

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.

Vacuum brazing furnace product use and structural features

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.

Continuous high temperature brazing furnace working principle and composition

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

Simple understanding of vacuum brazing furnace

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.

The use of vacuum brazing furnace in good condition

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.

Vacuum furnace exquisite workmanship

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.

Pump vacuum brazing furnace temperature is too high

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.

The use of vacuum brazing furnace in good condition

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.

Vacuum brazing performance of the unit

Vacuum brazing performance of the unit

Vacuum brazing furnace brazing furnace to maintain excellent soldering quality depends on the performance of the vacuum brazing furnace maple group vacuum brazing furnace pump often need to pay attention to don't think that you never turn it off, it will run forever. "If the vacuum brazing furnace maintenance crew at the time, on weekends and holidays shutdown, more economical to do so. Otherwise, if still idling at the weekend, mechanical pump will be stuck and difficult to start again. Our experiment results show that the average winter set in 28 degrees, set in 26 degrees in summer. With this method can save a lot of electricity. Due to the lack of water or overheating: temperature 140. ~ 150. F the above 60 ~ 66 ℃), easy to cause mechanical pump overheating, and noises. Available portable device on a weekly basis to pump vacuum brazing furnace oil filter, check the oil level and take the sample, check the oil quality by feeling and appearance.
A few years ago, we have found that the mechanical pump use high quality oil is more economic. The cost of high quality oil is generally more than three times of industrial oil, and keep the pump clean time is five times the sustainable. A valve should be replaced every three months and spring. Stainless steel spring longer diffusion pump should be removed once a year, to overhaul, including all the cleaning. After the diffusion pump oil contaminated can't vacuum soldering furnace So should check the quality of the oil level and oil once a week. Best high quality silicon oil, such as SW1 - ZKY or a brand. Practice shows that using this oil can keep the degree of vacuum brazing furnace in 10 ~ l0 3-5 torr range, brazing production quite satisfied. Replace the oil can be recycled, the price about 70 yuan, every kilograms and new oil 220 yuan per kilogram.

The vacuum brazing process

The vacuum brazing process

Brazing temperature is the most main technical parameters of vacuum brazing, conclude that the vacuum brazing temperature is the important basis of the selected the melting point of solder and heat treatment of the brazing standards. Vacuum brazing temperature should be higher than the melting temperature of solder, appropriate to reduce the surface tension of the liquid solder, improved wet and caulking, and make the solder and parent metal energetic effect each other, the strength of the joint progress. At the same time, appropriate temperature is higher than the melting temperature of solder and set aside to meet space, also can prevent due to inaccurate temperature control device, workpiece temperature uneven may cause solder melting bad faults. But brazing temperature can be harmful, it may cause solder high vapor pressure elements evaporation, parent metal grain grew up or burnt, and far effect and cause of solder and dissolution, brittle compound layer and intergranular into such questions, make joint function decline, and may be serious weaken the function of the parent metal.
Generally speaking, the vacuum brazing temperature should be higher than the liquidus temperature of the solder 20 ~ 60 ℃, but on different solder, need solder itself above the liquidus temperature scale is different, sometimes even need to drill under the below the liquidus temperature of the solder
Welding. Solder on strong and parent metal effect each other, because of its branch in the process of caulking attacks constitute a very big change and new alloy, concluded that the brazing temperature should be made up of brazing seam in new alloy on the basis of the melting point. Solder on melting temperature scale wide, because above the solidus temperature for liquid phase, and must have liquidity, so the brazing temperature can also be selected below the liquidus temperature of the solder. About eutectic reaction brazing and soldering temperature only in eutectic reaction temperature slightly.
Thinking to the functions of the parent metal for vacuum brazing welding thermal cycle, the influence of brazing temperature pick it necessary to think about the impact on the function of parent metal, brazing shall be in the parent metal attack intense temperature below that at which grain growth or burnt. Drafting of brazing temperature still need harmony with standards of heat treatment after brazing. Brazing temperature can be selected and material, for example, the temperature of the solid solution treatment temperature, and can choose integration of brazing, heat treatment technology, soldering heat preservation after the completion of direct cooling by heat treatment requirements, within a heat cycle end brazing and heat treatment technology at the same time. During the heat treatment after brazing, selection of heat treatment temperature remelting is best not to make solder attack.

Good performance of vacuum brazing furnace

Good performance of vacuum brazing furnace

Vacuum brazing furnace to maintain excellent soldering quality depends on the performance of the vacuum unit. Often, vacuum pump needs to be careful not to think that "you never turn it off, it will run forever." If vacuum maintenance crew at the time, on weekends and holidays shutdown, more economical to do so. Otherwise, if still idling at the weekend, mechanical pump will be stuck and difficult to start again. The results of our experiments show that this method can save a lot of electricity. Due to the lack of water or overheating, mechanical pump overheating, and noises.
It's better to keep the water temperature is 140. (60 ~ 150 F a 6 ℃), the use of portable devices to pump oil filter once a week, check the oil level and take sample, check the oil quality by feeling and appearance. A few years ago, we have found that the mechanical pump with high quality oil is more economic. The cost of high quality oil is generally more than three times of industrial oil, and keep the pump qing jie time is five times the sustainable. Live a door should be changed every three months and spring. Stainless steel spring live longer.