The advantages of vacuum furnace performance are significant

     The advantages of vacuum furnace performance are significant

The vacuum furnace, as the name implies, is in a vacuum in the furnace, so it avoids many other types of coal burners.
Eliminating the oxidation and decarburization of the surface of the workpiece during the heating process, the cleaning surface of the non-metamorphic layer can be obtained. That only when grinding mill side of cutting tools (such as twist drill grinding after make direct exposure to edge) of the decarburization layer of the grooved surface cutting performance greatly improved relations.
No pollution of the environment, no three waste disposal.
The measurement of furnace temperature and the accuracy of monitoring are obviously improved. 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 electromechanical integration. On the basis of improving temperature measurement and control accuracy, the workpiece movement, air pressure adjustment, power adjustment, etc., can be programmed in advance, and the hardening and tempering are done by step.
The energy consumption is significantly lower than 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.

The characteristics of the vacuum furnace temperature field

The characteristics of the vacuum furnace temperature field

The heating element of a vacuum furnace is generally round. The heat transfer in a vacuum is only radiation, no conduction and convection. There are three modes of conduction, convection and radiation in non-vacuum heating, and the convection and conduction are different from normal furnace (conventional pressure).
The pressure is less than 1 x 105Pa (absolute pressure, the approximate work pressure of the normal furnace). Working pressure close to the vacuum (pa) 2, the convection and conduction effect basic does not exist, workpiece temperature is slow, especially below 600 ℃ heating, heating more slowly, the temperature of the workpiece temperature thermocouple temperature control has certain hysteresis.
The vacuum furnace temperature uniformity measurement is different from ordinary furnace, when measuring the need to guarantee the normal work of the furnace under the condition of vacuum and pressure rise rate, can correct determination of furnace temperature. Because, unlike ordinary furnace, vacuum furnace heat transfer of actual temperature measurement process shows that the control thermocouple temperature at the beginning of the heat preservation and the effective heating area measuring thermocouple temperature difference is bigger. In vacuum condition, temperature deviation in the normal heat preservation time of the effective heating area can reach + / - 5 ℃, meet the needs of the process.

High temperature vacuum furnace

High temperature vacuum furnace

High temperature vacuum furnace refers to the vacuum furnace temperature above 1500 ℃, vacuum high temperature furnace is equipped with infrared thermometer, temperature up to 2500 ℃ and temperature control can be obtained. Vacuum furnace according to the temperature range is divided into low temperature furnace (below 650 ℃), medium temperature (650 ℃ -- 1500 ℃), high temperature furnace (above 1500 ℃).
High temperature vacuum furnace can be used for used for cemented carbide sintering, powder metallurgy and other industries, can also be used for research and development department of scientific research test, high temperature vacuum electric furnace structure affects the balance of furnace temperature, vacuum furnace for many years production experience, our company the reasonable structure of furnace body, temperature balance is good, the vacuum furnace heating correlation even, high temperature vacuum furnace, furnace temperature in good balance.

How to control the heating of molybdenum wire furnace

How to control the heating of molybdenum wire furnace

Temperature coefficient of resistance of tungsten and molybdenum materials is opposite bigger, low-temperature resistance is small, therefore made of tungsten and molybdenum materials do resistance furnace heating element in the process of cold heat, if do not use appropriate control method to produce excessive current and damage to equipment.
At present, the main component of the voltage and current control in the heating and insulation of the electric furnace is the thyristor, the fatal defect of silicon controlled is the overcurrent and the over-voltage difference.In tungsten molybdenum wire of electric furnace, the wire resistance rate at low temperatures is small, easy to produce the flow, so how to guarantee under the premise of the production process to avoid appear over current at low temperatures is of vital importance.According to many years' research and engineering practice of the author, the temperature coefficient of resistance of the larger tungsten molybdenum wire of electric heating can use manual piecewise constant pressure heat up, automatic segmentation pressure limiting temperature and pressure limiting current limit of the double closed loop heat three methods, but can not only meet the current and can meet the requirements of heating process.
Furnace in the first place at a certain temperature heating rate and the targets set by the first paragraph, because of the furnace and furnace heat absorption and heat diffusion, reaches the set temperature when the heating power and cooling rate balance, electric furnace in the process of thermal insulation, temperature in thermal process control system with proper power to maintain constant temperature control of electric furnace.Then, further increase the temperature of the heating voltage, the heating power of the electric furnace is raised, and the electric furnace enters the next phase of warming.

Vacuum furnace operation method

Vacuum furnace operation method

A, preparation,
First turn on the cold water machine, vacuum furnace may alarm because of the water pressure is too low.
Second, turn the power switch
Before electricity, be sure to carefully check the status of each switch:
1, the heating way should be put in "manual", counterclockwise to the end for power regulation can be;
2, pressure lowered a stop "toggle switch, if there is any check its in stop position, pressurized potentiometer have the knob to the minimum.
After the above checks are no errors. To open the main power switch. Then open the power switch.
Third, furnace into the sample
Normally the stove when not in use are under vacuum condition, so before use to check the stove is under vacuum, first using the inlet valve of furnace gas has been slowly to the atmospheric pressure, and then turn on the furnace cover with a jack and removed the lid and put in the sample that need to burn. If you don't need to pressure sintering, then be sure to remember to cover the inside and outside the two layers of insulation cover, otherwise, the temperature may rise will not come up. If want to undertake heating sintering, then must make the most out of insulation cover in the middle of the small cover off to start testing. Note: when put the sample must not touch the heating element, prevent short circuit occur furnace shell and the heating element.
Vacuum furnace features:
1 low processing temperature, vacuum furnace, the workpiece is not easy to deformation.
2, vacuum furnace can process carbon steel, cast iron, steel, low alloy steel, stainless steel and other materials.
3, vacuum furnace, can improve the strength, corrosion resistance and abrasion resistance.

There are several kinds of vacuum furnace heating way, what is commonly used?

There are several kinds of vacuum furnace heating way, what is commonly used?

Vacuum furnace is commonly used in design of high temperature thermal energy saving all metal stainless steel as a frame structure, because of the relative to the other metal heat preservation effect not only first-class stainless steel and heat insulation constant temperature is quite unique, and quick in work quickly, using insulation resistance to high temperature alloy furnace heating is very fast. So there are several kinds of vacuum furnace heating mode? Vacuum furnace heating mode according to different purposes of actually has a lot of kinds, but a way of heating "heat", is a commonly used vacuum furnace heating mode.
Vacuum furnace in the bottom of the chamber of a stove or furnace set very convenient temperature resistant plate equipment and artifacts in the heating process is not affected by temperature difference and deformation and even caused the explosion, when welding the bottom of the furnace and furnace body USES is seamless welding method, can effectively form a super vacuum mode, and when the enterprise in the production of vacuum furnace valve USES the German advanced compression techniques, reasonable to use the oven door gravity to close the valve, and using the lever principle to open the valve. On the switch link to ensure the safe and does not appear because of the heat bilges cold shrink, extrusion deformation caused by various unpredictable accidents, enterprise set up the reasonable protection valve spring buffer device.

Concrete analysis of the effect of heat treatment

Concrete analysis of the effect of heat treatment

Alleged metal heat treatment, it is with the aid of certain thermal effect (sometimes by mechanical action, chemistry or other principals) to the change of the human internal organization and structure, metal alloy to obtain the required performance of process operations. In all kinds of metal materials and products of the production process, heat treatment is one of the indispensable important segment.
Casting is usually needed to eliminate internal stress of low temperature annealing, or completely annealing or normalizing; Some still need after quenching tempering (aging). Heat treatment of steel in the whole production process, including heat treatment of steel ingot, pressure processing and finished products in the process of heat treatment. Heat treatment of steel ingot is mainly of annealing at different temperatures. Heat treatment of steel can be used in accordance with the process performance and performance requirements. Such as all kinds of steel should be normalized processing, often in order to obtain fine and uniform microstructure and good mechanical properties. High strength quenched and tempered steel shell}! High temperature quenching tempering treatment, often to ensure that meet the requirements of the comprehensive mechanical properties. Stainless steel plate and steel belt, most solid solution treatment to improve its corrosion resistance. Hot forging (rolling) steel according to the requirements of the user to determine the heat treatment process of the products. Cold drawing (rolling) steel billet heat treatment, heat treatment and finished goods between heat treated.
Non-ferrous metal and its alloy semi-finished products or products of the production with steel and steel parts production phase 'roughly, but in the non-ferrous metal processing technology in the process, heat treatment is an important part of the more. No congratulations on heat treatment. Plate and strip production would not be performed.