Vacuum Brazing Furnace: 2017

2017年5月25日星期四

How does a vacuum brazing furnace operate?

There are many kinds of vacuum furnaces, and the scope of application is very wide, vacuum furnace has vacuum brazing furnace, so how to operate the vacuum brazing furnace? Let's talk about the vacuum furnaces.
Before you open the stove, you should check the water, electricity, gas and so on.
Before placing the material, you should check the heating room, ask for the clean, not the clutter, the material you put in should be dry and clean, no water stains and oil stains.
When the loading is complete, push the button to the door, then open the device.
4. Vacuum, when more than 1000 mpa, monitoring J2 lights up, then to Cairo, pump, if not up to par, roots pump is not open, button there will be no response.
Through the introduction of vacuum furnace, it is believed that the operation of vacuum brazing furnace is very clear.

2017年5月19日星期五

Vacuum brazing furnace structure

Vacuum brazing furnace is processed workpiece heat treatment of a large equipment, can undertake vacuum annealing, vacuum limitation as well as vacuum brazing and so on heat treatment processing. Vacuum brazing furnace can write a variety of different applications, can also control and write hundreds of curve of heat treatment, its temperature control zone can be roughly divided into before and after the up, down, left, right, and the six partitions, vacuum brazing furnace installation has a single point and multi-point temperature protection device and temperature recorder, and the uniformity of furnace temperature can be controlled in the range of fluctuation of 3 degrees Celsius, in addition, also strong cooling device with high flow, high purity nitrogen. The vacuum brazing furnace has high efficiency and high furnace quantity.
Vacuum brazing furnace is mainly used in aluminum vacuum brazing, titanium alloy, stainless steel, high temperature alloy, hard alloy and nonferrous metal brazing, and die steel, stainless steel, high speed steel and bearing steel materials such as vacuum tempering heat treatment.
Vacuum brazing furnace structure:
Vacuum brazing furnace consists mainly of heating room, vacuum chamber, pump system, control system and heat exchanger. The pump system consists of the maintenance pump, mechanical pump, diffusion pump, and the rotz pump. Valve consists of pneumatic valves such as high valve, front stage valve, maintenance pump valve and by-pass valve. The heating chamber consists of heating chamber shell, heater, reflector, insulation, hearth and electrode.
When the vacuum brazing furnace works, the mechanical pump, the diffusion pump, the pump and the front stage valve, the pump valve, and the pump valve begin to vacuum in the diffusion pump. When the vacuum in a vacuum brazing furnace reaches a certain value, the rotz pump, the bypass valve starts and the front valve closes, and the vacuum chamber is evacuated. When the diffusion pump is heated to the specified temperature, the bypass valve closes, the high valve and the front valve open. The heat treatment process can be carried out after the vacuum chamber is vacuum and the vacuum degree is required.

2017年5月17日星期三

Vacuum brazing furnace and furnace design

1, furnace design
The part of the furnace is the main part of the vacuum brazing furnace, which consists of two parts: the hearth and the furnace door. The furnace tube is made up of double deck steel plates, which contain furnace bile (that is, the heating room). Furnace tube wall and the outer wall made from stainless steel and carbon steel, respectively, in the middle is a water jacket, on top of the furnace tube is equipped with water cooling electrode introduction, introduce thermocouple, cooling pipe, pneumatic system and other devices. The door adopts the oval standard head, the sealing head is also double water jacket structure, can open before and after, the door has glass observation window, convenient to install and exit the work piece. In order to guarantee the vacuum inside the furnace, the shaft and the furnace door are sealed with the dovetail seal groove, "O" type rubber ring.
Second, furnace design
Furnace urchin is made up of hexahedron (four sides), which is placed on the rails of the furnace and the front and back of the furnace door, which can be easily changed. All heating surfaces are made up of stainless steel frames and five-layer reflecting screens. The first screen is a molybdenum screen, while the other four layers are stainless steel. The heating element is made up of several molybdenum wire, which is insulated by the 95-porcelain and is fastened to the frame by the stainless steel connection column. In order to reduce the warp distortion caused by high temperature thermal expansion, the reflection screen is made up of several pieces. No use nickel chrome in the device as a heating element, nickel chromium heating bill of materials from temperature indicators, it can completely meet the requirements, but under the high vacuum high temperature, volatile nickel chromium element, particularly chromium element belongs to the low vapor pressure material, contaminate furnace, affect the solder and the surface element content, lead to welding seam mechanical property in the heat treatment performance degradation.

2017年4月27日星期四

Brazing technology of classification and what are the advantages?

Brazing is one of the three welding method, including fusion welding, brazing and bonding of the three. Brazing process is mainly to use than the weld metal of low melting point metal solder, and then heated to a temperature higher than the weldment and filler metals solder, below the melting temperature of the weldment, then using liquid solder wetting welding pieces of metal, fill the joint clearance and mutual diffusion and base metal, so as to realize a method of connecting the weldment. So compared with other welding methods, brazing process advantages what?
1, when soldering, solder melts, and weldment won't melt, and the temperature of the welding with the different choice of solder, and at room temperature to nearly large areas of the parent metal melting temperature change inside. In order to avoid the base organizations, as well as the change of the performance, you can choose to brazing filler metals, which have lower melting point and welding is no choice.
2, at the time of brazing, welding is often a whole heating or around the brazing seam for uniform heating of large area, therefore, relative distortion of welding and brazing welding head are much smaller than welding residual stress, it is also to ensure the precision of welding.
3 are heavily dependent on liquid filler metals, brazing seam automatically fill the gap after frozen, so as long as the solder, flux and brazing methods selection of good, can mass or many brazing seam welding at the same time or continuous brazing, productivity is very high. In the process of brazing rarely because of the accessibility of the weld structure, and open sex.
4, because the soldering reaction only in parent material of a few microns and even the following interface to dozens of micrometers, so, generally does not involve the deep structure of parent metal, and therefore, more suitable for dissimilar metal stents, and even nonmetallic and nonmetal, the connection between the metal and nonmetal, it is can't do welding method.
5, brazing seam strength and heat resistance were lower than the base metal, and in order to make up the lack of strength, often by increasing the overlap area to solve the problem, so the braze welding head will be more samples of the lap joint methods to increase the weight of the structure, therefore, is more brazing materials.

2017年4月6日星期四

The vacuum brazing furnace main

It is mainly used for aluminium parts brazing production under the protective atmosphere. Mainly include solder spray machine, electric heat drying furnace, brazing furnace, water-cooled air cooling device, the atmosphere control system and automatic control system, etc. Suitable for parallel flow condenser, cascading evaporator and car tank mass production of aluminum alloy heat sink, etc.
Main features:
1, spray device has the advantages of simple structure, easy to use.
2 in furnace, drying furnace circulating wind speed is high, large heat capacity, ensure the workpiece drying thoroughly.
3, brazing furnace reasonable partition fine, high precision temperature control, furnace temperature uniformity is good, energy-saving effect is remarkable.
Production line 4, the consummation control system integration, intelligent, control, alarm, protection system to ensure the safe and reliable operation of the production line.
More than 5, range, high precision of oxygen analyzer for real-time accurate measurement in furnace atmosphere provide advanced means.

2017年3月29日星期三

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 the difficult 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.

2017年3月28日星期二

How to determine the cooling speed of vacuum brazing furnace parts

Weldment cooling is done at the end of the soldering heat preservation, but the rate of cooling is have effect on the quality of the joint. Cooling speed too slow, may cause the grain growth of parent metal, solder with parent metal interaction time growth, leading to excess of parent metal to dissolve in the solder, produce corrosion defects; To speed up the cooling speed, which is beneficial to refine brazing seam organization, thus improve the joint strength; But cooling speed too fast, may make the welding crack due to excessive internal stress formed, may also be due to the brazing seam rapid solidification doesn't make the gas evolution and formation porosity. Therefore specific to determine the cooling speed, must be combined with weldment size, by synthetically considering all kinds of factors such as parent material types and solder.

2017年3月23日星期四

The characteristics of the vacuum furnace design

Vacuum furnace design adopts many new and high science and technology, to introduce the following vacuum furnace design features:
1, energy conservation and efficient
Vacuum furnace designed by high vacuum furnace technology, boiler operation state is vacuum, therefore the boiling point is lower, so the heat exchange performance is better, so that improve the efficiency of the boiler and save a lot of energy.
2, safe and reliable
Vacuum furnace negative pressure operation, there can be no heat medium in the vacuum state, the danger of explosion. Furnace with the heat medium water, there is no dry vacuum furnace. Multiple automatic protection device for the vacuum furnace design, make its safety performance is greatly enhanced.
3, long service life
Vacuum furnace of the heat exchanger is stainless steel material, not corrosion at high temperature, it is impossible to scale, the service life of 20 years.
4, rich models
Vacuum furnace design models is very rich, there are horizontal, vertical, gas, fuel and other models for customers to choose.
5, easy installation
Streamline shape when vacuum furnace design, vacuum furnace units are generally smaller volume, easy to transport and install.
Six, pay attention to environmental protection
Vacuum furnace design adopts high-performance burner and flame structure, combustion is very sufficient, the indicators all meet the national discharge standard.
7, exemption formalities
Does not need pressure window approval vacuum furnace, also does not need to be careful, when workers also do not need to take relevant work permit.
8, intelligent control,
Vacuum furnace design adopts touch screen display, virtual buttons, Chinese graphic display, fault self diagnosis instrument as well as the man-machine dialogue.

2017年3月20日星期一

Good performance of vacuum brazing furnace

Vacuum brazing furnace to adhere to the excellent soldering quality depends on the function of the vacuum unit. Vacuum pump often need to pay attention to don't want to think "permanent don't you shut down, it will run forever." If be vacuum unit maintenance at that time, on weekends and holidays shutdown, more economical to do so. Otherwise, if still idling at the weekend, mechanical pump is stuck and hard to start again. Let's test results show that this method can save a lot of electricity. Because of the lack of cooling water may overheat, form a mechanical pump overheating, and announced the noise.
The best water temperature of 140. (60 ~ 150 F a 6 ℃), with simple equipment to pump oil filter, once a week to check the oil level and take the sample, by feeling and appearance check the quality of the oil. A few years ago, we have found that the mechanical pump with excellent oil is more economic. Excellent oil cost is over more than three times of industrial oil, and adhere to the pump qing jie time is five times the sustainable. Once every three months should replace live door and spring. Stainless steel spring longer life spans.

2017年3月3日星期五

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.

2017年2月28日星期二

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.

2017年2月23日星期四

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.

2017年2月21日星期二

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.

2017年2月6日星期一

Vacuum soldering furnace money purposes

Vacuum soldering furnace money purposes:
1. High speed steel, die steel, stainless steel quenching
2. Stainless steel, titanium alloy solid solution treatment
3. Magnetic materials of vacuum heat treatment
4. The high temperature brazing and vacuum sintering
Furnace with graphite furnace and metal furnace two kinds: general material selection more graphite furnace, its heating element for the graphite rod.
Heat insulation screen for carbon felt and ceramic blanket, if use metal molybdenum and stainless steel heat shield, it is mainly used for titanium alloys, special parts, such as soft magnetic alloy. Temperature control adopts intelligent temperature controller, motor control using FX2N programmable controller.

2017年1月16日星期一

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.

2017年1月9日星期一

Vacuum furnace using the matters needing attention in the process

Vacuum furnace started large-scale application in the industry. After more than 80 years of development, vacuum furnace technology mature. So-called vacuum furnace, just as its name implies is to achieve a vacuum inside the furnace, mainly for metal, ceramic, parts of annealing, quenching, etc. Improve the performance of metal, clean surface and vacuum furnace in the whole work, won'tproduce any pollution, therefore belongs to the green environmental protection industrial furnace.
With all industrial furnace, vacuum furnace needs to be treated with oven before use. Vacuum furnace and vacuum leak detection at the same time, to ensure the normal work, stable vacuum furnace and vacuum environment. Because of the special performance, vacuum furnace in the process of daily use, there are still some places worthy of attention.
First used in vacuum furnace maintenance, the vacuum furnace maintenance workers are recorded and backup. The use of vacuum furnace, repair date, the cause of the problem, recorded in the workload. In general, vacuum furnace components in the use of 2 to 3 years, began to need replacing. Vacuum furnace, especially in the spring and autumn are prone to failure, therefore, during the spring and autumn in to strengthen the maintenance of vacuum furnace. Vacuum furnace in when not in use again after using for a long time, must carry on the vacuum leak detection.
The beginning of the vacuum furnace put into use after maintenance, to increase the frequency of inspection, from the furnace temperature to the actual temperature in the furnace in the table a good statistics. Check with abnormal data in time.

2017年1月3日星期二

Vacuum brazing furnace main use

Vacuum brazing furnace, it is a kind of used for metal brazing and bright heat treatment equipment. Suitable for mass production of small and medium-sized stainless steel parts (tableware, cutting tools, hardware, etc.), such as martensite stainless steel bright quenching, tempering, austenitic stainless steel bright annealing.
Main use: vacuum brazing furnace is mainly used for auto filter refrigeration parts, aerospace industry, can also be used for refrigerator, air conditioner, electronics, microwave magnetron industry and other stainless steel, carbon steel, brass, copper brazing and bright heat treatment of the parts.
Areas of application: vacuum brazing furnace is mainly used in steel industry, metallurgical industry, etc.

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