The influencing factors of vacuum furnace temperature to transfer

The influencing factors of vacuum furnace temperature to transfer

1, the strength of the vacuum furnace heating element, in the design, mainly in the form of heat. Internal heat source heating, temperature, from inside to outside, the strength size directly affect the temperature distribution in the furnace. When the inner court, the higher, the higher the temperature of the a fixed-point, at the same time must be the bigger the temperature difference distribution area. So, in the actual production process, can control the surface of the furnace core through the load or furnace core power control furnace temperature distribution.
2, reaction material from the core of distance, when furnace core power must have, namely the strength of the internal heating element must have, the farther distance furnace core of reaction, the lower the temperature, may not be able to achieve the required temperature reaction, the closer distance furnace core, the higher the temperature, the reaction.
3, burden the better performance of radiator cooling performance of the furnace charge, internal heat loss, the faster the outward heat loss in the reaction of material very easily, cause a fixed temperature decrease. But if the cooling performance of the reaction is not good, is needed for the convergence of heat, allows heat to pass time lengthen, conducive to the material to absorb heat and reaction, raise the temperature of a fixed point. Reaction under the condition of high vacuum (pa) 4 ~ 13, reaction temperature 1200 ℃, temperature of furnace core will soon be able to achieve the required value, so the reaction time of depending on the thickness of the material, the reaction furnace core periphery thought furnace insulation layer in the distance. Can through the design of furnace size control power supply time.

The influencing factors of vacuum furnace temperature to transfer the three main factors

The influencing factors of vacuum furnace temperature to transfer the three main factors

According to the temperature field distribution equations, the internal heating type vacuum furnaces the whole temperature field distribution, mainly depends on several aspects of constraints. Namely material average coefficient of thermal conductivity, the average density of P and q on average than hot melt c.. Factors that influence the vacuum furnace temperature to transfer includes the following three points:
1: the strength of the furnace heating element, in the design, mainly in the form of inner heat source. Internal heat source heating, temperature, from inside to outside. The strength of size directly affect the temperature distribution in the furnace. By (5) it can be seen that when the higher the heat inside roar, a fixed point of the higher the temperature, at the same time a certain temperature difference (delta T) of (r), the greater the distribution area. So, in the actual production process, can control the surface of the furnace core through the load or furnace core power control furnace temperature distribution.
2: the response is the distance from the furnace core (delta r), when a certain core power, namely the inner heat source strength must be, the farther distance furnace core of reaction, the lower the temperature, may not be able to reach required temperature reaction. The closer distance furnace core, the higher the temperature, the reaction.
3; Burden of heat dissipation performance, the burden of the heat dissipation performance, the better, the faster the internal heat loss outward, heat loss in the reaction of material very easily, cause a fixed temperature decrease. But if the cooling performance of the reaction is not good, is needed for the convergence of heat, allows heat to pass time lengthen, conducive to the material to absorb heat and reaction, raise the temperature of a fixed point. Should be under the condition of high vacuum (pa) 4 ~ 13, reaction temperature 1200 ℃, the core temperature will soon be able to achieve the required value, so the reaction time of depending on the thickness of the material, namely the reaction furnace core periphery expect furnace insulation distance. Can through the design of furnace size control power supply time.

Vacuum furnace of common sense

Vacuum furnace of common sense

1, vacuum high-pressure gas quenching furnace, high speed steel, stainless steel, die steel, good hardenability materials, the characteristics of the vacuum heat treatment deformation small, after the heat treatment of parts of parts does not need to clean. Defects cost high, will not be repaid quenching gases. High pressure gas quenching vacuum furnace from the structure can be divided into two horizontal and vertical. Level can be divided into single room, double room and the chamber of commerce. Vertical circular cylinder and the application of long rod parts heat treatment. Vacuum high-pressure gas quenching furnace quenching pressure is usually 2 b AR 10 b A R. Can choose according to the needs of users type furnace parts is applicable to pressure.
2, vacuum furnace can be divided into single rooms, double rooms and vertical generally used nickel-chromium alloy heating temperature is 800, NE. Vacuum tempering furnace general requirements after tempering parts surface light, no oxidation color.
3, vacuum furnace, can be divided into the single room, double room and vertical. Vacuum furnace based on component selection of materials under high temperature and low temperature, high temperature, 800 ℃ ~ 1350 ℃, the temperature is 800 ℃).

Troubleshooting method of vacuum furnace

Troubleshooting method of vacuum furnace

Vacuum furnace in daily use shall timely maintenance and maintenance, if vacuum furnace product quality is not very good or not timely maintenance may appear a little problem, the following to introduce some troubleshooting methods of the vacuum furnace.
Vacuum furnace of troubleshooting
The experiment of low temperature if can not meet the standard to look at the same temperature to reduce speed. If is temperature drop slowly you will need to check whether work under indoor without drying process. Studio in testing prior to drying processing and placed too much experiment, so that make the air cycle cannot cause; If this is not the need to check the cooling system of the equipment, refrigeration equipment need professional personnel to check.
High temperature experiment when the temperature was not up to standard, need to check the electrical system, use the method to determine failure problems. Temperature increase at a slower speed if you need to see if the regulating plate in the circulatory system in closed effect cycle, or check whether the fan system normal operation. Once if the temperature is too high, can make the machine trigger over temperature protection, need to check the problems is to control the instrument, there is a problem can be directly replaced.

The high temperature furnace lining maintenance and maintenance

The high temperature furnace lining maintenance and maintenance

Lining maintenance (1) when the longitudinal cracking furnace wall, should be taken to slow heating way, make the melting of the reentry after crack bridging. (2) when the transverse cracking furnace wall, according to the actual situation in the transverse crack in fill in the fine powder, refractory material, then charging melting. (3) when the hearth erosion, available lining material for repair, and covered with iron plate after repair, add metal melt furnace charge low power full power to melt again after a period of time. Lining maintenance (4) under the cold furnace condition commonly, the furnace should use natural cooling, cooling or water cooling system does not allow water to cool. (5) melting at the end of the net liquid iron, in order to prevent the crack of the furnace wall, should be added for thermal insulation asbestos board on the front. (6) if it was stopped for a long time, the next time when blow-in melt slowly heat up, the lining of the small cracks close on its own.

A common use of vacuum furnace

A common use of vacuum furnace

A common use of vacuum heat treatment furnace steel alloy. Many applications involving heat treatment of steel, makes it tough, through a service of quenching and tempering. Sclerosis involving heat the steel to a predetermined temperature, and then rapidly cooling.
The application of vacuum furnace brazing ideal choice. Brazing is a kind of heat treatment process, the other is used to connect two or more base metal parts, through the filler metal melting thin layer in the space between them.
Further applications of vacuum furnace, vacuum carburizing, also known as the low pressure carburizing or LPC. In the process of gas (such as acetylene) was introduced to the temperature of the hot spots, usually in the partial pressure of 1600 f and 1950 f. Broken into its constituent elements (in this case, the carbon and hydrogen) gas. Carbon atoms, and then spread to the surface of the part of the area. Often repeat, the function of the input of the gas and the duration of the diffusion time. Work once the correct "shell", usually adopt oil or high pressure gas (HPGQ) normally, nitrogen or helium faster quenching induction quenching. This process is also known as case hardening.

With characteristics of vacuum furnace

With characteristics of vacuum furnace

Vacuum furnace is dry and sensitive, easy oxidation, or easy to break down material for design. You can use the internal part filled with inert gases, for some objects with complex components quick drying is particularly convenient.
Rectangular studio maximum effective volume. Microcomputer temperature controller can control temperature accurately. In the viewing room steel bulletproof double glass door to make indoor objects at a glance.
Case of open or close, can adjust elasticity. The overall shape of the silicone rubber door seal ensures a high vacuum chamber. Chamber using stainless steel (or wire-drawing sheet), to ensure the durability of the product.
Storage, heating, test, and dry with oxygen or inert gas under the environment of so they will not be oxidation. The shortest heating time, compared with the traditional vacuum drying oven, the heating time is reduced by 50% or more.

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

What are the graphite in the application of vacuum furnace

What are the graphite in the application of vacuum furnace

Normally, the industry could be divided into: graphite vacuum furnace according to the temperature low temperature graphite graphite temperature vacuum in vacuum furnace, furnace, high temperature vacuum furnace.
Low temperature vacuum furnace: working temperature below 1150 ℃ oven; In the vacuum furnace temperature graphite: working temperature at 1150 ℃ to 1600 ℃ oven; High temperature vacuum furnace: working temperature higher than 1600 ℃ oven;
Graphite materials commonly used vacuum furnace heating body features:
Graphite, vacuum is often used to 2200 ℃, 2300 ℃ vacuum significantly increased evaporation, maintain the atmosphere (inert gas) for pressure elements in evaporation is abate, can be used in the 2400 ℃;
Graphite furnace vacuum furnace (heating body, the reflective screen) material:
Gas maintenance or graphite material of vacuum furnace, tungsten, tantalum, graphite usually are three;
Heating graphite, graphite is used in vacuum furnace should be high purity, high strength, such as static pressure molding isotropic three high graphite, otherwise will not be strong high temperature function and electrical function and service life; Domestic graphite vacuum furnace to choose domestic graphite furnace type, more for demand is not high in the low temperature vacuum furnace. Trust, follow the quality improvement of domestic graphite progress, in the high temperature furnace, graphite will be widely used.
Because the vacuum furnace temperature cooling speed is slow, low temperature fast cooling is advocated measures, advance production efficiency. Low temperature fast circulation, circulation outside the furnace can choose furnace, two methods, the cooling gas usually choose an inert gas.