Large Bell Jar Lifting Ion Nitriding Furnace 220V/380V For Metal Materials Surface Treatment

Equipment Use

The large bell jar lifting ion nitriding furnace is a kind of equipment used for surface treatment of metal materials.

Structural design

• bell jar structure: Usually adopts double water-cooled structure bell jar, such as stainless steel shell and inner lining, water cooling in the middle, can effectively take away heat, prevent furnace body overheating, and ensure the temperature uniformity in the furnace. The top of the bell jar is provided with an observation window, generally made of double-layer tempered glass, which is convenient for the operator to observe the situation in the furnace during the nitriding process.
• lifting system: equipped with electric or hydraulic drive lifting mechanism, through the motor, reducer, chain or steel wire rope components, to achieve the bell jar stable lifting, but also the use of hydraulic cylinder as the power source, can provide greater lifting force, to ensure the bell jar in the lifting process of stability and reliability, to meet the needs of large workpieces loading and unloading.
• Bottom structure: The bottom of the furnace is usually designed as a movable trolley structure, which is easy to enter and exit the workpiece. The surface of the trolley is laid with high-temperature insulation materials and heating elements to ensure the temperature uniformity in the furnace and the heating effect of the workpiece.

Working principle

• After the furnace is pumped to a certain vacuum degree, an appropriate amount of ammonia gas and other nitrogen-containing gas is injected to ensure that the pressure in the vacuum chamber reaches a proper range. A DC voltage, generally 400-750V, is applied between the bell (anode) and the workpiece (cathode) to form a high-voltage electric field. Under the action of electric field, nitrogenous gas ionizes, producing nitrogen ions and electrons. Nitrogen ions bombarde the workpiece surface at high speed under the action of electric field force, converting kinetic energy into heat energy, making the workpiece temperature rise. At the same time, nitrogen ions are absorbed by the workpiece surface and diffused inward to form a nitriding layer, thus improving the hardness, wear resistance, corrosion resistance and other properties of the workpiece surface.

Performance parameters

• Processing size: can be customized according to actual needs, the common processing workpiece diameter can reach several meters, height can also reach several meters, to meet the nitriding requirements of large wind power gear, ship shaft and other large parts.
• Temperature control: the working temperature is generally between 450-650℃, the temperature uniformity can be controlled within ±5℃, the use of high-precision thermocouple or thermal resistance for temperature measurement, and through the PID controller to achieve accurate temperature control.
• vacuum degree: the vacuum degree of empty furnace can usually reach below 1Pa, and the working vacuum degree is generally between 10-1000Pa, to meet the requirements of ion nitriding process for vacuum environment, equipped with high-performance vacuum pump sets, such as rotary plate pump, Roots pump, etc., to ensure the rapid extraction and stable maintenance of vacuum degree in the furnace.
• Power supply parameters: the power supply voltage is generally 380V or higher, according to the size of the furnace body and the size of the processing workpiece, the power supply can range from tens of kilowatts to hundreds of kilowatts, the output current density is usually between 0.5-20mA/cm² 2.

Advantages

• Efficient treatment: can handle multiple large workpieces at one time, improve production efficiency, shorten the nitriding cycle, compared with the traditional well nitriding furnace and other equipment, the production efficiency can be increased by 30%-50%.
• good uniformity: the bell jar structure and advanced temperature control system make the temperature and gas distribution in the furnace more uniform, ensure the uniformity and consistency of the nitriding layer, and improve the processing quality of the workpiece.
• Convenient operation: automatic lifting system and trolley hearth design make the loading and unloading of workpieces more convenient and fast, reduce the labor intensity of workers, and equipped with automatic control system, can realize the preset, monitoring and adjustment of process parameters, simple and convenient operation, reduce the influence of human factors on the process.
• Energy saving and environmental protection: the use of advanced heating technology and insulation materials, reduce heat loss, reduce energy consumption, at the same time, compared with the traditional gas nitriding process, ion nitriding process itself has the advantages of energy saving, gas saving, no pollution and so on, in line with the requirements of environmental protection.

Application Field

• Machinery manufacturing: used for surface hardening treatment of various large mechanical parts such as gears, shafts, molds, etc., to improve the wear resistance, fatigue resistance and service life of the parts.
• Automobile manufacturing: It can nitride key parts of automobile engine crankshaft, connecting rod, gear and so on, improve the performance of parts, reduce wear, and improve the reliability and durability of automobiles.
• Aerospace: It is suitable for the surface treatment of parts of superalloy, titanium alloy and other materials in the aerospace field to enhance the performance and reliability of parts in harsh environments such as high temperature and high pressure.

Technical parameter