What is the importance of the vacuum furnace cooling system?

What is the importance of the vacuum furnace cooling system?

Vacuum furnace is electric heating element near the vacuum heating furnace. Vacuum furnace cooling system is an important part of vacuum furnace. Cooling water should maintain smooth, otherwise the temperature rise caused downtime. This is vacuum furnace work often neglected problems When no one management major damage may result in vacuum furnace.
Molybdenum vacuum furnace heating after long time use will harden, shrinkage, drop, lodging first lap, after fusing (melting) wait for a phenomenon. To make the vacuum furnace heating wire is necessary strength at high temperature, prevent hardening, collapsed or droop, first to design the structure of the vacuum furnace heating wire size, such as spiral wire, pay attention to the heating element bending diameter, pitch and screw pitch diameter, etc. The heating body is going to loose by vacuum furnace insulation lining, 95 ceramic on insulation lining is put aside, leave the expansion space. Shelve location should be suitable for, one is in commonly 100 ~ 100 mm, and can prevent resistance wire to lie prone on strong hook. Also should avoid furnace silk direct contact between each other (short circuit), usually to pad spacer.
Deal with cooling water with biological decomposition chemical auxiliary method, the purpose is to keep the minerals in suspended state, reduce the rubber tube, coil and water jacket in sediment accumulation, to make the water clear. This generally adopts an automatic device to complete, it can monitor the conductivity of the water, automatically added chemicals, wash water, add fresh water. Cooperate with auxiliary steam filtration system, this method can guarantee the pH of the water control, to prevent redundant mineral deposits in the cooling water system. After the system work stable, at least once a month for the water quality test case after processing or owed.

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.

The safety of the vacuum furnace characteristics

The safety of the vacuum furnace characteristics

Vacuum furnace that vacuum heat treatment technology and comprehensive technology, the combination of the two professional heat treatment is to point 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. At present most of the vacuum heat treatment furnace work vacuum degree in 1.33 ~ 1.33 x 10 ˉ after Pa.
Vacuum heat treatment can achieve almost all 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 heat treatment 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 process was more and more attention and applied more and more.

Development of a vacuum furnace

Development of a vacuum furnace

The creation and development of vacuum furnace plays an very important role in human progress. Appeared in the shang dynasty in China, relatively perfect copper smelting furnace, furnace temperature reached 1200 ℃, the stove inside diameter of 0.8 meters. In the spring and autumn period and the warring states period, people in molten copper furnace on the basis of further mastered the technology of improving furnace temperature, thus produce the cast iron in 1794, the world was introduced to direct the cylindrical cupola melting cast iron. In 1864, after the French Martin by using the principle of the British Siemens regenerative furnace, built the first steel open hearth is heated with gas fuel. He used the regenerator to high temperature of air and gas, so as to ensure the steel needed for the temperature above 1600 ℃. Around 1900, power supply sufficient gradually, started to use a variety of resistance furnace, electric arc furnace and cored induction furnace.
In the 20th century 50 s, coreless induction vacuum furnace to get rapid development. Then the electron beam furnace, the use of electron beam to impact solid fuel, can strengthen the surface heating and melting of the high melting point materials. Used to forge heating furnace was first hand forge, the working space is a concave groove, groove filling in coal, combustion with air from the bottom of the tank for the artifacts buried heating in the coal. This furnace thermal efficiency is very low, the heating quality is not good, and only small workpiece heating, after development for refractory brick build by laying bricks or stones becomes close partly or fully enclosed chamber of a stove or furnace chamber furnace, can use coal, gas or oil as fuel, also can use electricity as a heat source, the artifacts in the chamber of a stove or furnace heating.

The primary principle of vacuum brazing furnace

The primary principle of vacuum brazing furnace

Vacuum brazing furnace is in a vacuum environment to maintenance of sintering furnace heated objects, the heating method is more, such as resistance heating, induction heating, microwave heating, etc. Vacuum induction furnace is the use of induction heating to maintenance of sintering furnace heated objects can be divided into the power frequency, medium frequency, high-frequency, such as type, can be attributable to a subclass of vacuum brazing furnace. Vacuum induction furnace Vacuum induction furnace is in a vacuum or maintain atmosphere conditions, using the principle of intermediate frequency induction heating make carbide cutter head, and all kinds of metal powder limit sintered body implementation of complete sets of equipment, is for hard alloy, metal dysprosium, and planning in the industrial production of ceramic materials.
A hydrogen sintering furnace, vacuum induction tungsten first principle and use vacuum induction furnace tungsten is after vacuum filling hydrogen maintenance conditions, using the principle of intermediate frequency induction heating, the high temperature of tungsten crucible in the winding, after thermal conduction to the work, suitable for scientific research, military units for hard metal such as tungsten, molybdenum and its alloy powder sintering molding. Second, primary layout and layout method for vertical, the discharging method. Its primary group became: electric furnace body, vacuum system, water cooling system, pneumatic system, hydraulic system and front-rear institutions, base, workbench, induction heating equipment (tungsten heater and high-grade thermal insulation material), into the electric equipment, intermediate frequency power supply and electrical control system, etc. Third, primary function After vacuum filling the hydrogen gas maintenance and control atmosphere in furnace pressure and sintering conditions. Available optical fiber infrared radiation thermometer and the armoured thermocouple temperature measurement (0 ~ 2500 ℃), and after comparing the intelligent temperature control and setting process, select performance status feedback to medium frequency power supply, automatic control temperature of concave and convex and heat preservation program

Automatic control system, vacuum furnace core processing

Automatic control system, vacuum furnace core processing

The automatic control system, have the effect of core processing vacuum furnace, specific include the following contents:
1) communicate with touch screen program. Through rs - 485 read from the touch screen operation command and parameter Settings, and translating data types used by vacuum furnace operation; The process parameters and the running state of return touch screen for each station.
2) logical handler. According to the collected signal logic, issued on the system and the control signals of running state for each station. Complete skip transportation, vacuum pump, vacuum switch of each valve, given heating, cooling fan, furnace, inflated, etc.
3) fault alarm function: according to the technological requirements, a vacuum furnace brazing furnace temperature display abnormal low (or overtemperature), thermocouple damaged or open circuit fault alarm functions, such as when there is abnormal or fault occurs, the fault alarm signal corresponding to the temperature of the point of failure and the touch screen display signal will appear flashing at the same time, to remind the operating personnel in a timely manner to adjust the brazing furnace temperature and to deal with failure.

The overall structure of vacuum furnace

The overall structure of vacuum furnace

Vacuum tempering furnace furnace The body consists of two parts; The upper part of the vacuum chamber (negative pressure steam room), hold the space tubular steam-water heat exchangers, used to heat flow through the circulating water heat exchanger. Operating principle: the vacuum hot water boiler is running, under vacuum negative pressure furnace absorbed heat medium water inside the fuel combustion heat release, boiling vaporization for low temperature steam, low temperature steam rising in stainless steel heat exchanger in circulating water system, circulating water heating for the user or sanitary hot water for heating. Itself is cooled water vapor condenses into water droplets fall to the heat medium water again after heated, so as to complete the whole cycle.
So it is the working principle of the interior of the vacuum furnace. HTM constantly in an enclosed body = = = = evaporation condensation = = "boiling heat medium water" in the loop, so don't need to supplement the condensed water, also do not have empty the risk of burning. Vacuum hot water boiler using soda condensation heat transfer, in all working condition of heat transfer, soda, condensation heat transfer coefficient of heat transfer is the highest.

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.

Briefly describes the application of vacuum system industry

Briefly describes the application of vacuum system industry

Vacuum system application industries: electrical engineering, textile, CNC engraving machine, vacuum forming machine, folding machine, exposure machine, computer, semiconductor, circuit boards, batteries, capacitors, binding machine, photographic plate maker, freezing air conditioning process vacuum, packing machine, transformer, optical lens, automatic injection type, polyurethane technology, label pasting machine, printing machine, plate line, the vacuum lifter, vacuum suction cups, printing presses, VCD&DVD disc surface vacuum coating, industrial furnace, smelting and vacuum heat treatment, metal coating, vacuum welding, electron beam welding, vacuum coating, vacuum drying, such as welding, vacuum packaging industry, space simulation, scientific research, hospitals, negative pressure system, environmental protection industry, electronic industry, laboratories, plastic industry, general machinery, glass, marble, metal large heavy vacuum handling industries.