Please send us your inquiry about the customization of other furnace types or related questions about vacuum furnace. We will reply you immediately. Thank you.
Downloads
All documents in the overview
News & Press
All news at a glance
Request
Send us a message
Email: contact@vacfurnace.com
Tel : +86-21-50878190
Wechat : 2210154395
Address: NO.1299, XinJinQiao Road, Pudong New Area, Shanghai, China.
Composition and structure of vacuum hardening furnace
Structure of vacuum hardening furnace (furnace body)
The horizontal single-chamber air-cooled vacuum hardening furnace is mainly composed of the following parts: furnace shell, heating chamber, heater, furnace bed, etc.
(1)Furnace shell.
The furnace shell includes the furnace body, furnace door, and hinges and clamping mechanisms connecting them. The furnace shell provides a vacuum environment for heating and hardening, and the heating chamber is installed inside it. It is generally a welded horizontal circular container that is required to have vacuum sealing. One end of the furnace shell is an openable furnace door, and the other end is an elliptical head. The furnace body and the furnace door are connected by hinges and have a clamping mechanism. The furnace wall of the furnace body and the furnace door is a double-layer structure, and cooling water can pass through the middle. There are many interfaces connected to the outside on the inner and outer walls of the furnace body.
(2)Heating chamber.
The heating chamber is the main component of the vacuum hardening furnace. It separates the heater from the furnace body, and the workpiece is heated in the heating chamber. The heating chamber is mostly square, and the chamber wall is composed of a multi-layer structure. The outer wall is made of stainless steel plate, which plays a role of fixing and supporting. The outer side of the outer wall is welded with cooling water pipes to improve cooling efficiency. The inner wall is made of molybdenum sheets and fixed to the outer wall of the heating chamber by molybdenum rods, which can greatly reduce heat radiation loss. Between the inner and outer walls is thermal insulation ceramic fiber or graphite felt, which can prevent heat conduction loss.
There is an openable front door at the front end of the heating chamber, which is connected to the outer wall of the heating chamber with a hinge for the workpiece to enter and exit. There are upper and lower doors in the upper and lower directions. Driven by the cylinder, the upper door can move forward and backward, and the lower door can move up and down. When cooling the workpiece, the upper and lower doors are opened, and the forced circulating cooling gas enters from the bottom, exchanges heat with the workpiece, and then flows out from the top.
Rollers are installed on both sides of the heating chamber to enable the heating chamber to slide in and out on the track inside the furnace body.
(3)Heater.
The electric heater is inside the heating chamber. Generally, six hollow graphite tubes are installed on the upper and lower parts of the heater as heating elements. There are graphite blocks between the graphite tubes. The heater is connected to the power line through water-cooled electrodes. The heater is fixed to the outer wall of the heating chamber through ceramic tubes and molybdenum rods (there is a ceramic insulating sleeve between the heater and the molybdenum rod). The heater cannot be connected to any object except the power supply, the insulated ceramic tube and the insulating sleeve. Ceramic materials can play both insulating and heat-insulating roles.
(4)Furnace bed.
Above a row of heating tubes under the heater, a furnace bed and a material basket are placed. When working, the material basket loaded with workpieces is placed on the furnace bed. The furnace bed is made of graphite and corundum materials, which can minimize heat loss while ensuring strength.
Vacuum Hardening Furnace