Introduction to Some Knowledge Points of Ion Nitriding Furnace Equipment
Heat treatment equipment generally uses electric heating elements to heat workpieces. The temperature inside the furnace is basically the same, and the temperature of the thermocouple can also represent the temperature of the workpiece. Ion nitriding workpieces are heated by their own arc discharge. Due to the workpiece having an electric potential, the thermocouple cannot directly contact the workpiece. Therefore, the temperature of the temperature - measuring thermocouple is usually inconsistent with that of the workpiece. The fewer the workpieces in the furnace, the longer the distance between the thermocouple and the workpiece, and the greater the difference between the temperature of the thermocouple and that of the workpiece. In the actual operation of specific processing technologies, methods such as estimated temperature and simulated temperature measurement are often used to make up for the problem of inaccurate temperature measurement.
The temperature of the ion nitriding furnace equipment is uniform. Ion nitriding workpieces are heated by their own arc discharge. Different workpieces in the same furnace have different qualities, different areas, and thus different heat absorption. Therefore, the temperature of the workpieces is likely to be uneven. In the actual operation of the processing technology, the distance between workpieces in the same furnace does not need to be too large. The way of loading workpieces into the furnace needs to be considered. Workpieces with large quality and small area may have a slightly lower temperature when heated.
The ion nitriding furnace equipment contains small round holes to solve the problem of workpieces with narrow slits. Workpieces with small holes and narrow slits are prone to hollow cathode reaction, resulting in excessive local current intensity, excessive temperature rise, and electric spark discharge, making processing impossible.
The structure of the ion nitriding furnace equipment consists of five parts: furnace body, power transmission device, vacuum acquisition system, power supply system, gas supply system, and temperature measurement.
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The furnace body is composed of a cover, a cylinder, a chassis, and a base frame. The interlayers of the furnace cover, cylinder, and chassis are connected with cooling water. The interior is equipped with a stainless steel and aluminum alloy double - layer heat insulation screen. The furnace body is provided with double - layer tempered glass for observing the situation inside the furnace during the ion nitriding process.
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The cover is equipped with two sets of power transmission devices and one set of hanging columns with thermocouples, on which a hanging plate is installed. Users should design a hanger according to the parts to be processed, and hang the workpiece on the hanging plate through the hanger.
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The vacuum acquisition system is generally composed of two rotary vane vacuum pumps and a pipeline system in series with a butterfly valve. The function of the butterfly valve is to adjust the pumping capacity by closing or rotating at different angles to maintain the pressure in the furnace under different air intake conditions. The vacuum degree is measured by the supporting vacuum gauge to read the vacuum value.
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The gas supply pipe inlet of the ion nitriding furnace equipment is set on the furnace shell cylinder, with one rotameter for hydrogen calibration/nitrogen calibration respectively.
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The thermocouple is inserted into the furnace through the hanging column with the thermocouple for simulated measurement. The temperature is recorded by the instrument, and P, I, D temperature control is carried out.
We can provide products that meet the process and technical requirements according to customer requirements, including ion nitriding furnaces, ion carburizing furnaces, etc. We have professional research on heat treatment processes and equipment such as ion carburizing and ion nitriding.
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