Wondery Vacuum Gas Nitirding Heat Treatment Furnace , Plasma Ion
Nitriding Furnace
1. General Introduction
The plasma ion nitriding furnace is mainly used for ion nitriding,
ion nitrocarburizing (soft nitriding) plasma chemical heat
treatment of mechanical parts to modify the surface of mechanical
parts and obtain the required mechanical and physicochemical
properties.
Basic parameters:
2.1 Output voltage: 0-900v continuously adjustable; 2.2 Maximum average output current: 150A; 2.3 Pulse peak current: 300A 2.4 Pulse frequency: 1000Hz 2.5 Working size: φ1600×1200mm; 2.6 Operating temperature: ≤ 650 ℃; 2.7 Rated load: 3000kg; 2.8 Limit vacuum: ≤ 6.67pa; 2.9 Pressure rise rate: ≤ 0.13pa/min; 2.10 Vacuum pumping time to 20Pa: ≤ 30min; 2.11 Arc extinguishing time: ≤ 15 μ s 2.12 Temperature control accuracy: ± 1 ℃ 2.13 Pressure control accuracy: ± 1 Pa; 2.14 Automatic process control.
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2.Equipment Configuration
| Item | Specification | Q’ty (set) |
| Pulse ion power supply | WDLC-150AZ | 1 |
| Vacuum ion nitriding furnace body | Effective size:φ1600×1200mm (H) | 1 |
| Vacuum pump | 2X-30 | 2 |
| Electric vacuum butterfly valve | GID-65 (Ningbo) | 2 |
| Vacuum solenoid valve | DDC-JQ65 (Ningbo) | 2 |
| Mass flow controller | D07 (Beijing) | 2 |
| Film absolute pressure vacuum gauge | ZJ-1C CHENGDU | 1 |
| Pressure controller | Shimaden, Japan | 1 |
| temperature controller | Shimaden, Japan | 1 |
| Rectifier transformer | 180KVA oil immersed (Wuhan) | 1 |
| PLC (programmable controller) | FX series, Mitsubishi | 1 |
| Industrial control computer | 15"Color touch screen | 1 |
3.Standard configuration of equipment
The complete set of industrial gas nitriding furnace is composed of
ion power supply, automatic control system, vacuum furnace body,
vacuum acquisition system, temperature measurement and control
system and gas supply system.
3.1 vacuum furnace body
3.1.1 vacuum furnace body
The vacuum gas nitriding furnace body adopts bell type structure,
and the furnace body is composed of bell cover and furnace base.
The manufacturing of the furnace body shall be carried out in
strict accordance with the welding process to ensure that all
sealing surfaces are not deformed and ensure the vacuum sealing
requirements for a long time.
3.1.2 cathode
This is the most important part of the nitriding heat treatment
furnace body, from which the gas nitriding furnace power supply
supplies the material tray (cathode tray) for nitriding the
workpiece. In view of the particularity of vacuum discharge under
high voltage, the cathode structure is directly related to whether
nitriding operation can be carried out. The longitudinal clearance
protection adopted by us has the advantages of simple assembly and
reliable operation.
2.1.3 temperature measurement
Thermocouple is used for temperature measurement of vacuum heat
treatment furnace body. In order to ensure the accuracy of
temperature measurement of workpieces, the method of simulated
temperature measurement is adopted, which has a good effect on mass
nitriding products.
3.1.4 vacuum measurement
The vacuum measurement adopts capacitive film vacuum gauge, which
is accurate and not affected by gas composition.
3.1.5 vacuum pump
2 sets of 2X-30 rotary vane vacuum pumps are used.
3.1.6 nitriding gas
Liquid ammonia is usually used as nitriding working gas, and the
user shall prepare liquid ammonia. Ammonia pressure reducing valve
is provided by our company. During soft nitriding, the user shall
also prepare carbon dioxide and pressure reducing valve. The
working gas is generally depressurized to 0.1-0.15Mpa.
3.2 power supply
The power supply of the ion plasma nitriding furnace includes
rectifier transformer, thyristor rectifier circuit, pulse
generation circuit and control circuit.
The thyristor (SCR) module of rectifier circuit is of Japanese
SanRex brand.
The fast recovery diode (VD) module of the protection circuit is of
German IXYS brand.
The IGBT module of pulse generation circuit is selected from
Mitsubishi brand.
The special rectifier transformer, special smoothing reactor and
inductor are of quality domestic brand.
The power supply adopts solidified circuit for action control, the
circuit is simple, and the reliability is greatly improved. The
operation buttons are provided with mutual protection, so that the
equipment will not be damaged even if the operator misoperates. The
protection circuit is specially designed to automatically protect
the equipment and parts in the furnace even if there is a short
circuit between the anode and cathode. During operation, it is not
necessary to make gear switching according to the arc striking
condition in the furnace, so as to avoid the fault caused by human
judgment error, and greatly reduce the heating in the electric
control cabinet.
The power supply is equipped with alarm and protection for wrong
phase, phase shortage, overtemperature and overpressure.
3.2.1 silicon controlled rectifier circuit
The circuit provides DC high voltage for the equipment. In order to
ensure the DC output, thyristor double pulse phase-shifting trigger
is adopted. The phase-shifting trigger circuit has the advantages
of simple circuit, good phase-shifting linearity, wide
phase-shifting range, good anti-interference performance and small
ripple coefficient.
3.2.2 pulse generation circuit
The circuit chops the DC high voltage into rectangular pulses and
inputs them into the vacuum furnace. The pulse power supply has
obvious energy saving, rapid arc extinguishing and no workpiece
burning.
3.2.3 computer automatic control system
The control system has two modes: manual and automatic. The
full-automatic mode can realize the automatic control of the whole
process. The process parameters such as temperature and furnace
pressure are controlled by computer. Input multi-stage temperature
rise (pressure) and thermal insulation (pressure) curves
corresponding to the target process on the computer, set
multi-stage arcing control, and the process parameters can be
corrected in real time. Suitable for special requirements of ion
nitriding.
The temperature, vacuum nitriding furnace pressure and other
process data of the whole process are stored in the computer,
processed by the graphics software, displayed on the computer
screen in the form of color graphics curve, and can be printed and
saved. The historical process curve can be viewed by using the
large storage hard disk of the computer. For typical workpiece and
charging, the temperature, pressure curve and other parameters can
be saved in the computer with the specified name, and the same
process can be directly adopted for the same or similar workpiece.
In this interface, you can query the pressure temperature curve
recorded in history, including target curve and actual curve.The
red solid line in this picture is the actual temperature curve
recorded, and the blue solid line is the actual pressure curve
recorded.
4.Installation Conditions
4.1 Minimum site area required for equipment: 4m×6m concrete floor;
4.2 Ambient temperature: 0 ℃ - 45 ℃;
4.3 Relative humidity: < 85%;
4.4 Cooling water: water pressure 0.10-0.3Mpa, flow ≥ 3m3/h, room
temperature. If cooling water tower is used, the water flow should
be ≥ 6m3.
4.5 Maximum power of equipment: 160kW (3P AC380V±15%)
