How does a vacuum brazing furnace operate?

How does a vacuum brazing furnace operate?

There are many kinds of vacuum furnaces, and the scope of application is very wide, vacuum furnace has vacuum brazing furnace, so how to operate the vacuum brazing furnace? Let's talk about the vacuum furnaces.
Before you open the stove, you should check the water, electricity, gas and so on.
Before placing the material, you should check the heating room, ask for the clean, not the clutter, the material you put in should be dry and clean, no water stains and oil stains.
When the loading is complete, push the button to the door, then open the device.
4. Vacuum, when more than 1000 mpa, monitoring J2 lights up, then to Cairo, pump, if not up to par, roots pump is not open, button there will be no response.
Through the introduction of vacuum furnace, it is believed that the operation of vacuum brazing furnace is very clear.

Vacuum brazing furnace structure

Vacuum brazing furnace structure

Vacuum brazing furnace is processed workpiece heat treatment of a large equipment, can undertake vacuum annealing, vacuum limitation as well as vacuum brazing and so on heat treatment processing. Vacuum brazing furnace can write a variety of different applications, can also control and write hundreds of curve of heat treatment, its temperature control zone can be roughly divided into before and after the up, down, left, right, and the six partitions, vacuum brazing furnace installation has a single point and multi-point temperature protection device and temperature recorder, and the uniformity of furnace temperature can be controlled in the range of fluctuation of 3 degrees Celsius, in addition, also strong cooling device with high flow, high purity nitrogen. The vacuum brazing furnace has high efficiency and high furnace quantity.
Vacuum brazing furnace is mainly used in aluminum vacuum brazing, titanium alloy, stainless steel, high temperature alloy, hard alloy and nonferrous metal brazing, and die steel, stainless steel, high speed steel and bearing steel materials such as vacuum tempering heat treatment.
Vacuum brazing furnace structure:
Vacuum brazing furnace consists mainly of heating room, vacuum chamber, pump system, control system and heat exchanger. The pump system consists of the maintenance pump, mechanical pump, diffusion pump, and the rotz pump. Valve consists of pneumatic valves such as high valve, front stage valve, maintenance pump valve and by-pass valve. The heating chamber consists of heating chamber shell, heater, reflector, insulation, hearth and electrode.
When the vacuum brazing furnace works, the mechanical pump, the diffusion pump, the pump and the front stage valve, the pump valve, and the pump valve begin to vacuum in the diffusion pump. When the vacuum in a vacuum brazing furnace reaches a certain value, the rotz pump, the bypass valve starts and the front valve closes, and the vacuum chamber is evacuated. When the diffusion pump is heated to the specified temperature, the bypass valve closes, the high valve and the front valve open. The heat treatment process can be carried out after the vacuum chamber is vacuum and the vacuum degree is required.

Vacuum brazing furnace and furnace design

Vacuum brazing furnace and furnace design

1, furnace design
The part of the furnace is the main part of the vacuum brazing furnace, which consists of two parts: the hearth and the furnace door. The furnace tube is made up of double deck steel plates, which contain furnace bile (that is, the heating room). Furnace tube wall and the outer wall made from stainless steel and carbon steel, respectively, in the middle is a water jacket, on top of the furnace tube is equipped with water cooling electrode introduction, introduce thermocouple, cooling pipe, pneumatic system and other devices. The door adopts the oval standard head, the sealing head is also double water jacket structure, can open before and after, the door has glass observation window, convenient to install and exit the work piece. In order to guarantee the vacuum inside the furnace, the shaft and the furnace door are sealed with the dovetail seal groove, "O" type rubber ring.
Second, furnace design
Furnace urchin is made up of hexahedron (four sides), which is placed on the rails of the furnace and the front and back of the furnace door, which can be easily changed. All heating surfaces are made up of stainless steel frames and five-layer reflecting screens. The first screen is a molybdenum screen, while the other four layers are stainless steel. The heating element is made up of several molybdenum wire, which is insulated by the 95-porcelain and is fastened to the frame by the stainless steel connection column. In order to reduce the warp distortion caused by high temperature thermal expansion, the reflection screen is made up of several pieces. No use nickel chrome in the device as a heating element, nickel chromium heating bill of materials from temperature indicators, it can completely meet the requirements, but under the high vacuum high temperature, volatile nickel chromium element, particularly chromium element belongs to the low vapor pressure material, contaminate furnace, affect the solder and the surface element content, lead to welding seam mechanical property in the heat treatment performance degradation.