Vacuum Quenching Furnace Structural Characteristics

Among vacuum furnaces, vacuum quenching furnaces are the most widely used and representative typical equipment. They have complete and scientific quality management system, standardized production workshop, annual production capacity of 1000 electric furnaces, and the production scale is in the forefront of the industry. They are influential manufacturers of experimental electric furnaces and industrial furnaces in China.

Vacuum quenching furnace has the following characteristics:

1. Strict vacuum sealing is known to all that the heating and quenching of the workpiece are carried out in a closed vacuum furnace during vacuum heat treatment. Therefore, it is very important to ensure the vacuum degree of the vacuum quenching furnace to ensure the quality of the vacuum heat treatment of the workpiece. In order to ensure the vacuum performance of the vacuum furnace, the Kejia vacuum furnace body is welded by gas tightly with few holes on it, so as to minimize the chance of vacuum leakage. The components and accessories installed on the vacuum furnace body, such as water-cooled electrodes and thermocouple export devices, are also sealed structures.

2. Most heating and insulation materials can only use vacuum quenching furnace heating and insulation lining materials in vacuum and high temperature. These materials have the characteristics of high temperature resistance, low vapor pressure, good radiation effect and low thermal conductivity. For example, most vacuum quenching furnaces in China mainly use graphite as heating and insulation material. It is easy to oxidize when heated in atmosphere. Therefore, these heating and insulation materials can not be used in conventional heat treatment furnaces. The vacuum absorption of imported alumina fibers in Kejia vacuum furnace has better thermal insulation effect.vacuum-atmosphere-muffle-furnace-for-laboratory-gas-heat-treatment

3. The shell, cover, electrothermal element (water-cooled electrode) and heat insulation of vacuum furnace of water-cooled device all work in vacuum and heating state. In this extremely disadvantageous condition, it is necessary to ensure that the structure of each component is not deformed and damaged, and that the vacuum sealing ring is not too hot or burnt. Therefore, the components are equipped with water-cooling devices according to different conditions to ensure the normal operation of the vacuum furnace and sufficient service life.

4. When the vacuum degree reaches several hundred Pa, the glow discharge of the electrified conductor will occur at a higher voltage in the vacuum heat treatment furnace with low voltage and high current. Serious arc discharge will occur and the electric heating elements and insulation layer will be burned down, resulting in major accidents and losses. Therefore, the working voltage of the electric heating element of the vacuum heat treatment furnace generally does not exceed 80-100 volts. At the same time, the electrothermal elements should avoid the parts with sharp ends and the spacing between electrodes should not be too narrow to prevent the occurrence of glow discharge or arc discharge. 5. The high degree of automation is due to the operation of heating and cooling of metal workpieces, which requires dozens or even dozens of actions to complete. These actions are carried out in the vacuum furnace, which is inaccessible to the operator. At the same time, some actions such as heat preservation after the end of the quenching process of metal workpieces need to be more than one action and to be completed in a relatively short time. In such a rapid condition to complete many actions, it is easy to cause operator tension and constitute misoperation. Therefore, a higher automation program is adopted to control the vacuum furnace.Lowest-price-designed-programmable-temperature-control-lab-vacuum-furnace

Vacuum Heat Treatment Knowledge

1. Nitrogen should not be used as cooling gas when titanium alloy is treated in vacuum furnace, because titanium and nitrogen react at high temperature to form golden titanium nitride.

2. All the movable connections of the vacuum furnace are sealed by O-ring, which is cooled by water.gas-turbine-vacuum-casting-technology

3. When the workpiece is quenched in vacuum, vacuum quenching oil should be used, which has lower saturated vapor pressure.

4. Vacuum furnace maintenance should be in the state of vacuum or pure nitrogen, to avoid suction and moisture absorption when not in use at ordinary times.

5. The pressure rise rate of domestic vacuum furnaces should not be less than 1.33Pa/h, and the standard of some foreign enterprises should be 0.67Pa/h.

6. Vacuum heating is mainly radiation, and the workpiece should be kept spacing in the furnace.titanium-alloy-vacuum-melting

7. During the heating process, the workpiece and the material in the furnace will deflate and the vacuum will decrease.

8. The heating temperatures of vacuum tempering, vacuum annealing, vacuum solid solution treatment and vacuum aging are generally the same as those of conventional treatment.vacuum-heat-treatment-furnace-in-automobile-exhaust-gas-purifier

9. Vacuum tempering furnace should have quick cooling device. The pressure of cooling water should be greater than 0.2 Mpa and the flow rate should be adjustable.

10. Cooling gas: steel generally uses 99.995% pure nitrogen, superalloy 99.999% nitrogen or argon, titanium alloy 99.995% argon.

11. Warming up: After putting in the workpiece, it is usually pre-pumped to 6.67 Pa before heating up.aeroengine-vacuum-melting

Chemical heat treatment

1. Improving the wear resistance of parts

High carbon martensite hardening surface can be obtained by carburizing and quenching of steel parts, and diffusion hardening surface of alloy nitride can be obtained by nitriding of alloy steel parts. The surface hardness of steel parts obtained by these two methods can reach HRC58-62 and HV800-1200, respectively. Another way is to form anti-wear and anti-bonding film on the surface of steel parts to improve the friction conditions, which can also improve the wear resistance.low-temperature-vacuum-tempering-furnace

For example, the formation of Fe3O4 thin films on steam treated surfaces has anti-bonding effect, and the formation of Fe2SO4 thin films by surface vulcanization has both anti-wear and anti-bonding effects. In recent years, multi-element Co-penetration technology, such as oxygen-nitriding, sulphur-nitriding, carbon-nitrogen-sulphur-oxygen-boron five-element co-penetration, can form high hardness diffusion layer and anti-adhesion or anti-wear film at the same time, effectively improve the wear resistance of parts, especially the anti-adhesion and wear resistance.vacuum-heat-treatment-equipment-selection

2. Improving the Fatigue Strength of Parts

Carburizing, nitriding, soft nitriding and carbonitriding all can strengthen the surface of steel parts, while forming residual compressive stress on the surface of parts, effectively improving the fatigue strength of parts.vacuum-induction-furnace-manufacturer

3. Improving the Corrosion Resistance and High Temperature Oxidation Resistance of Parts

For example, nitriding can improve the atmospheric corrosion resistance of steel parts; after aluminizing, chromizing and siliconizing, dense and stable protective films of Al2O3, Cr2O3 and SiO 2 are formed by interaction with oxygen or corrosion medium, which can improve the corrosion resistance and high temperature oxidation resistance. Usually, the hardening of steel will bring about embrittlement at the same time. When the surface hardening method is used to improve the surface hardness, the core is still in a good toughness state, so it can better solve the contradiction between hardening and toughness of steel parts than the whole hardening method of parts. Chemical heat treatment makes the chemical composition and structure of steel surface change at the same time, so it is better than surface quenching and hardening methods such as high, medium frequency induction and flame quenching. If the infiltration elements are selected properly, a surface layer suitable for various performance requirements of parts can be obtained.vacuum-high-pressure-gas-quenching-furnace

Heat Treatment of Automotive Parts

There are five main heat treatment processes for automobile parts: annealing and normalizing, quenching, tempering, aging and tempering, surface quenching and chemical heat treatment. Today, Xiaobian mainly introduces several commonly used heat treatment processes for automotive parts.Industrial-vacuum-pressure-free-sintering-furnace-for-diamond-segments

1. Carburizing Heat Treatment of Automotive Parts

The main purpose of carburizing heat treatment is to obtain good fatigue resistance and wear resistance of parts and to ensure the reliability of Parts'performance. Generally, differential gear, transmission shaft gear, steering shaft gear, engine piston and gear parts of automobile drive axle need carburizing heat treatment.vacuum-furnace-range-up-to-3000c

2. Tempering and Heat Treatment of Automotive Parts

The quenching and tempering heat treatment of automobile parts can be divided into protective atmosphere quenching and tempering heat treatment and general quenching and tempering heat treatment. Protective atmosphere conditioning and heat treatment can ensure that parts do not produce surface oxidation, peeling and other defects in the process of heat treatment, and ensure the surface quality of parts. If the quenched and tempered parts need follow-up processing, general heat treatment is carried out.Industrial-vacuum-gas-quenching-furnace-with-high-pressure

vacuum atmosphere furnace characteristics

With the development of electronic information technology and economic prosperity, soft ferrite materials are more and more inclined to high-grade, small batch, multi-variety, short delivery period, good consistency and so on. In the past, the push-plate vacuum atmosphere furnace has gradually failed to meet the requirements of this high-grade product and changeable. The bell-shaped furnace came into being. The traditional soft ferrite manufacturers in the world have ordered the bell-shaped furnace. Laboratory-vacuum-tube-furnace-for-vacuum-atmosphere

With China's accession to the WTO, domestic ferrosilicon manufacturers have begun to experiment in order to adapt to the needs of the market, and have begun trials to produce high-end products. The market demand for bell jar furnaces has become increasingly urgent. Now according to the needs of the market, with reference to foreign similar equipment, we have developed a new generation of sintering equipment - bell-type vacuum atmosphere furnace series products, which use all-fiber high-temperature furnace lining, partition grouping and other technologies, with large batch output, temperature It has excellent uniformity of atmosphere, high consistency of sintered products and high yield. Compared with tunnel kiln, it is more flexible and has higher control precision, especially suitable for sintering and other products.1600-C-ceramic-sintering-furnace

The task of the bell-type vacuum atmosphere furnace is to achieve the desired purpose in a certain space. In addition, for the production type vacuum atmosphere furnace, the focus should be on the uniformity of temperature and atmosphere in an even small working area. Only when the temperature and atmosphere uniformity meet certain requirements can the consistency of batch sintered products be guaranteed.690-vacuum-melting-of-nickel-base-alloy-for-desulfurization

Aluminum alloy heat treatment technology

Aluminum alloy heat treatment technology

1, the principle of the aluminum alloy heat treatment
Aluminum alloy casting heat treatment is to choose a certain heat treatment specification, control the heating rate rises to a corresponding temperature cooling, heat preservation time to must speed to change its alloy, its main purpose is to improve the alloy's mechanical properties, enhance the corrosion resistance, can improve the processing, get the size stability.
2, the characteristics of the aluminum alloy heat treatment
As is known to all, for carbon steel, immediate access to the high hardness after quenching, and the plastic is very low. But for aluminum alloy and otherwise, the aluminum alloy after quenching, higher strength and hardness is not immediately, as for the plastic instead of down, instead of rose. But this kind of alloy after quenching, placed a period of time (e.g., after 4 ~ 6 days and nights), strength and hardness will be significantly increased, and the plastic is significantly reduced. The strength and hardness of aluminum alloy after quenching grow along with the time and improve the phenomenon, referred to as aging. Aging can occur at room temperature, according to the natural aging, can also be higher than the room temperature at some stage in the temperature range (100 ~ 200 ℃), called artificial aging.

Vacuum Oil/Gas Quench Furnaces (VOQ)

Vacuum Oil/Gas Quench Furnaces (VOQ)

The two-chamber design of the VOQ vacuum furnace  can meet all of your changing application needs. Depending on process requirements, the user can select quenching with either oil or inert gas.

The versatile VOQ vacuum furnace  is ideal for incorporation of heat treatment can also handle a multitude of thermal processes for a variety of materials including:

Hardening with gas or oil quench
Carburizing with gas or oil quench
Carbonitriding with oil quench
Brazing
Annealing
Solution annealing
Aging/stress relieving
Tempering

Vacuum Gas Quenching Furnace

Vacuum Gas Quenching Furnace

Vacuum Gas Quenching Furnace is applied for quenching high-speed tool steel, measuring vacuum hardening and cutting steel, tool steel and other alloy steel, with convection heating function, which can achieve the process of step hardening, isothermal quenching, but also tempering, annealing, carburizing, nitriding and other heat treatment process. Ultimate pressure :cooling gas ,6Bar or 10Bar.
The control system was controlled by PLC, temperature was controlled by intelligent temp controller, accurate control,high automation. User can choose auto or manual undisturbed switching tooperate it, this furnace has abnormal condition alarming function, easy to operate.
Environmental protection performance has been improved, maintenance cost saving, energy cost saving.