Vacuum Furnace Structure and Technology

Vacuum furnace is a kind of equipment that we use more in many production. So, what are the structural and technological characteristics of this kind of equipment? This is a question that we are going to introduce to you today. Now let's get to know it.

The technological process of vacuum furnace is as follows: the workpiece is put into the charging table enters the channel tank rises to the loading and unloading chamber, evacuates transfers the workpiece to the carburizing chamber to heat the workpiece and carburizes moves downward to the adiabatic chamber, and then transports to the gas quenching chamber to enter and cool exit the furnace.

Key points of vacuum furnace operation:

(1) Loading and unloading chamber: When the loading and unloading chamber enters the workpiece, it is vacuum pumped up to 6*102 Pa. When the chamber is equal to the pressure of the channel tank, the vacuum sealing valve is opened, and the lift transfers the workpiece down to the pressure of the channel tank and transmits it to the carburizing chamber.

(2) Heating carburizing chamber and carburizing process:

1. Carburizing temperature is 920-970 (1250).

2. The rotating speed of workpiece in carburizing furnace is 2 rpm.

3. C3H8 and N2 are injected into the furnace alternately by pulse through the heat-resistant steel nozzle, and [C]+H2 is formed after C3H8 is cracked. (Generally, the time of C3H8 and N2 diffusion is 1-4 min and 2-6 min in the period of strong osmosis, then the period of strong osmosis is gradually shortened and the period of diffusion is gradually prolonged, as shown in the table).

4. The carburizing process (including carburizing and diffusion) is controlled by four parameters: temperature, time, flow rate and pressure of C3H8 and N2. According to the technical requirements of the workpiece, various technical parameters are determined by computer simulation to realize the automatic control of carburizing process (developing dynamic control technology).

(3) Gas quenching uses adjustable (1-20)*105Pa high purity N2 to form a cooling channel in the carburizing furnace to cool the workpiece.

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