Welding forming method of the outer ring inlet and outlet water channel of the heat exchange honeycomb structure

Abstract

The invention belongs to the technical field of precision machining, and discloses a welding and forming method for the inlet and outlet water channels of the outer ring of the heat exchange honeycomb structure. The butt joint and limit sinking are used for brazing to position the insert and increase the brazing area, thereby improving the welding strength; then the insert, upper cover and lower cover are processed separately. According to the corresponding assembly steps, brazing is used to weld the insert and the fan-shaped groove butt joint to reduce the deformation of large-depth welding; the upper cover, the lower cover and the insert are convexly welded by argon arc welding. The platform is welded to the limit sunken platform of the fan-shaped groove. At the same time, partial welding with argon arc welding can ensure the welding strength between the fan-shaped groove and the upper and lower cover plates. Not only can the workpiece meet the welding strength requirements, but also the thermal deformation of the workpiece is small due to the slow heating of the whole during the welding process, effectively avoiding the distortion and deformation of the workpiece.

Description

technical field [0001] The invention belongs to the technical field of precision machining, and relates to a method for welding and forming an outer ring inlet and outlet water channel of a heat exchange honeycomb structure. Background technique [0002] The outer ring of the heat exchange honeycomb structure is made of 06Cr19Ni10 forging material. This part is the flange device of the heat exchange honeycomb structure. And the inner surface of the water chamber is smooth, no excess is allowed, such as figure 1 shown. [0003] However, there are more or less problems in the current traditional process and forming methods, as follows: a) Machining and forming: five-axis machining center equipment can realize inclined hole processing, and large-scale five-axis EDM equipment can realize square water channel processing , but the fan-shaped groove cannot be realized by machining methods. b) Casting molding: precision cast steel castings can form fan-shaped grooves and square w...

AI Technical Summary

Problems solved by technology

[0003] However, there are more or less problems in the current traditional process and forming methods, as follows: a) Machining and forming: five-axis machining center equipment can realize inclined hole processing, and large-scale five-axis EDM equipment can realize square water channel processing , but the fan-shaped groove cannot be realized by machining methods

b) Casting molding: precision cast steel castings can form fan-shaped grooves and square water channels, but the flow holes cannot be cast and formed, and the excess sand particles in the water cavity and water channels are not easy to clean, and shrinkage cavities and inclusions are easy to appear inside the castings, which is very It affects product quality, so the risk of using steel castings for the outer ring is extremely high

c) 3D printing forming: 3D printing can form fan-shaped grooves and square water channels. After the flow hole is printed, it can be expanded and ground with five-axis equipment to ensure the accuracy requirements. However, the cost of 3D printing the outer ring is very high and the cycle is very long. There are very few 3D printing equipment over 2 meters, so it is extremely inappropriate to use 3D printing technology for the outer ring manufacturing

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