The working principle of vacuum gas quenching furnace treatment

The working principle of vacuum gas quenching furnace treatment

The vacuum quenching have liquid quenching and quenching. Gas quenching after vacuum heating the workpiece to the cooling chamber filled with high purity gas such as nitrogen for cooling. Suitable for gas quenching with high speed steel and high carbon high chromium steel martensite critical cooling rate lower material. Liquid quenching is the workpiece heated in the heating chamber, moved to the cooling chamber filled with high purity nitrogen and immediately into the quenching tank, fast cooling. If need high surface quality of workpiece vacuum quenching and tempering after solution heat treatment and precipitation hardening should still take place in a vacuum furnace.

The importance of the theory of vacuum furnace cooling system

The importance of the theory of vacuum 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.
Vacuum furnace in close vacuum 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.

The three outstanding advantages, high temperature vacuum furnace

The three outstanding advantages, high temperature vacuum furnace

High temperature vacuum furnace can reach to the flows, is a kind of vacuum heating equipment, today the mysteries of the high temperature vacuum furnace for everyone. High temperature vacuum furnace in the furnace chamber within a particular space using the vacuum system, by the vacuum pump, vacuum measuring device and vacuum valve components such as carefully, substances out of furnace cavity part, making furnace chamber pressure is less than a standard atmospheric pressure, so as to realize a vacuum furnace cavity space, that is the vacuum furnace. In close vacuum state through the electric heating element heating furnace, the experimental furnace. In the metal casing or quartz glass sealing furnace used in pipeline connection with high vacuum pump systems. Vacuum chamber of a stove or furnace can be up to 133 x (2 ~ 10-10-4) Pa. Furnace heating system can be directly or silicon molybdenum rods with silicon carbide electric heating, high frequency induction heating is also available. Is mainly used for ceramic sintering, vacuum smelting and electric vacuum parts in addition to gas, annealing, brazing of the metal, and ceramic, metal seal etc.
1, can eliminate heat in the process of oxidation and decarburization on the surface of the workpiece, clean surface without metamorphic layer can be obtained. That only when grinding mill side of the cutting tool, such as twist drill grinding after make the groove on the surface of the decarburization layer directly exposed to the blade, the cutting performance of 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.
High degree of high temperature vacuum furnace electromechanical 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. Energy consumption significantly below the salt bath furnace. Modern advanced vacuum 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.

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.

Vacuum brazing furnace high precision temperature control system

Vacuum brazing furnace high precision temperature control system

Introduces the vacuum brazing furnace high precision temperature control system of the composition, working principle and using computer to realize automatic high precision temperature control algorithm. Practice shows that in different power vacuum heating equipment, using the control algorithm can achieve satisfactory control effect.
Along with the computer technology, the rapid development of modern control theory and industrial computer process control system has been widely used, in a lot of control engineering, have been obtained accurate control laws and methods, and can make the controlled object to get the desired response. At present, in the aspect of industrial kiln temperature automatic control, by using microcomputer to realize the direct digital control system to replace the analog PID control has been obviously, this not only improves the performance of the control system and control precision, but also enhance the control of the system. With the function. Vacuum brazing technology get more and more widely used in various industrial fields. Especially in the aerospace industry, some parts of brazing for heating speed and precision of temperature control are put forward higher requirements. In order to meet these parts brazing process, we developed to grind a sword the new brazing equipment, using microcomputer to realize high degree of automatic temperature control, can be in accordance with the requirements of different brazing technology automatically complete the whole process of soldering process. Differential signal processing such as PID control algorithm, so that the controlled volume stability in value. Temperature control system consists of two parts, the main circuit and control circuit, the principle of electrical control system structure is shown in figure 1. Figure 1 control system structure diagram, system composition and principle of using computer to realize automatic temperature control, must first put the furnace temperature of measured signal accurately in the form of digital t into the computer control system, and then compared with setting temperature to form both the deviation of the signal, the computer according to the partial main circuit including the ac power and magnetic voltage regulator, silicon controlled rectifier voltage regulator device.

The development of the multi-purpose high temperature vacuum furnace

The development of the multi-purpose high temperature vacuum furnace

According to thermal ion fuel element manufacturing process and equipment requirements, combined with high temperature and vacuum brazing furnace and vacuum annealing furnace structure, developed by the multi-purpose tantalum high-temperature vacuum furnace, it can be used to vacuum annealing, high temperature degassing, high temperature vacuum brazing process for many purposes, etc. Main technical parameters of no.1 is: the limit temperature of 2000 ℃; Ultimate vacuum 7 x 10-5 pa; Vacuum hot work about 10-4 pa; Effective heating zones Ч sizes ф 80 mm 80 mm; Mean temperature zone temperature deviation plus or minus 5.6 ℃ or less and more than 1600 ℃ measurement; Manual and automatic temperature control temperature control mode, can free conversion; Automatic temperature control error of 0.3% or less; The vacuum system for oil free vacuum system; Take time to time to 7 x 10-4 pa, 20 min or less; 20 kw power rating.
Has a high working temperature and vacuum degree, time quick, no oil vapor pollution, thermal inertia small, uniform temperature, temperature control accurate, convenient operation, safe and reliable characteristics. This furnace is designed for single room, vertical, loading, internal heating, resistance heating, vacuum furnace, tantalum heating element, metal screen heat insulation structure. This type of vacuum furnace thermal inertia small, high working temperature, but more complex structure and control, manufacturing installation accuracy requirement is high, difficult to debug. The whole equipment mainly includes vacuum furnace shell, heating element and the metal heat shield, vacuum system and electric control system and so on several parts.

Annealing furnace energy-saving aspects promote industrial development should be better

Annealing furnace energy-saving aspects promote industrial development should be better

With the development of science and technology and the engineering technical personnel's efforts, increasingly to develop in the direction of high yield, energy conservation and annealing furnace, furnace type structure more reasonable, compact annealing process will be, the annealing quality enhances unceasingly, meet the different needs of users.
To formulate reasonable continuous annealing process curve of metal recrystallization annealing temperature and cold rolling, the deformation level of the chemical composition of substrate, the heating speed, the original microstructure factors, such as how to finish the recrystallization annealing in line, can be in the production practice in different ways to satisfy the demands of various steel recrystallization temperature. However, change the strip heating and cooling in the annealing furnace q is the most effective way. To facilitate the operation, reduce artificial interference factors should formulate annealing process table, annealing curve drawing, to get the most out of annealing curve to the production practice.
Fully computerized control system operation control of modern continuous annealing furnace hot galvanizing unit including furnace tension control, shape control and running deviation control, combustion control, temperature control, furnace pressure control, etc. Control system should achieve the following functions: to adjust execution according to field instrument detection system; The fan start and stop the program logic control, safety monitoring system and cooling system, gas burner ignition and other logic control; Operating parameters, medium consumption and production statistics display and record; PC display system and the operator of exchange; Setting procedure, the operator designated, the mathematical model for calculation of dynamic control and accident of logic control, production report; Contact and exchange of information with process computer. Join the site instrument for the exchange of digital and analog signals. Strip steel based on the actual situation and the target heating system, through the mathematical model for the setpoint of furnace parameters automatically. Realize the above control function can play a maximum efficiency of the furnace, reducing furnace unit consumption.

Vacuum induction furnace processing technology

Vacuum induction furnace processing technology

Vacuum furnace according to the structure can be divided into vertical and horizontal two series, the series is divided into vertical bell lift and lift the bottom tray. Horizontal series of single structure and front and rear double open the door to open the door again two kinds of structure. Furnace adopt water-cooled wall structures.
Heating equipment to protect the greenhouse adopts full metal typeand compound two to choose from, all metal type of heat-resisting stainless steel and molybdenum screen; Compound of heat-resisting stainless steel, molybdenum screen and carbon felt, mullite fiber or silicate fiber composition. The specific choice depends on the user's process conditions and the requirement of process environment.
Heater is nichrome wire (belt), molybdenum wire (belt, bar), several types such as graphite, specific choice depends on the user's maximum temperature. Heater distribution have heating type and all-round heating two all around, to ensure that the user requirements for uniform temperature in the vacuum furnace type.
Cooling system has roots blower external loop structure, centrifugal fan centrifugal fan outside loop structure, cold wall circulate in several types such as the structure, meet the requirements of different cooling speed.
Vacuum system with pump + + mechanical pump, turbomolecular pump, turbomolecular pump, mechanical pump, diffusion pump, roots pump and mechanical pump, roots pump + mechanical pump, low temperature condensate pump + several types such as mechanical pump, according to the ultimate vacuum index selection.
Imported intelligent temperature controller, temperature control can realize the automatic control of heating, constant temperature, cooling function; With process curve storage function, can store several different process curve; Have litre cooling speed is adjustable and accurate clock function, can also according to the actual temperature and set temperature and other parameters; A vacuum furnace operation and power-fail protection function. Has a perfect alarm and protection.

Vacuum gas quenching furnace in daily production to pay attention to item

Vacuum gas quenching furnace in daily production to pay attention to item

Heat treatment is a kind of widespread in industrial process, usually is carried out under vacuum heat treatment, this leads to vacuum gas quenching furnace is widely used in daily industrial production, so in the process of using need to pay attention to what?
Tightly squeezed vacuum seal: it is well known that most of the parts for vacuum heat treatment are conducted in airtight vacuum gas quenching furnace, thus, obtain and shake the leak rate due to the stove, ensure that does not make the vacuum degree of vacuum furnace, vacuum heat treatment to ensure parts quality most has very important significance, so a key problem of vacuum heat treatment furnace, is sufficient to have reliable vacuum sealing structure, in order to guarantee the vacuum performance of vacuum furnace, vacuum heat treatment furnace structure must be followed in the design of a basic principle, is the furnace should use airtight welding, at the same time as little as possible to open or not open hole in the furnace body, less use or avoid using dynamic sealing structure, to reduce the vacuum leak, do the most installed on the vacuum furnace parts, accessories such as water-cooled electrodes, such as thermocouple export stomach also must design the seal structure.