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.