Apparatus and method for annealing pipes

Abstract

The invention provides a device and method for annealing pipes. The device includes a nitrogen heating furnace assembly, an annealing furnace assembly, a fixed guide assembly and a pipe. The nitrogen heating furnace is located on both sides of the annealing furnace box. The nitrogen heating furnace and the annealing furnace box N groups of air pumps and automatic flow control valves are set between the bodies. The air pumps are connected to the automatic flow control valves through the gas pipeline. The two ends of the gas pipeline are respectively connected to the nitrogen heating furnace and the annealing furnace box. The automatic flow control valve and the annealing furnace box form n paths, the guide tube, the fixed frame and the charging rack are respectively located inside the annealing furnace liner, the pipes are placed on each layer of the charging rack, and each charging rack can be placed Multiple pipes with two temperature sensors mounted on top of each pipe. The invention strictly controls the annealing temperature during the annealing process of the pipe, avoids the phenomenon that the local temperature is too high or too low, makes the annealing temperature of the pipe rise evenly, and makes the mechanical properties reach a better standard.

Description

technical field [0001] The invention relates to the technical field of heat treatment, in particular to a device and method for annealing pipes. Background technique [0002] In the process of manufacturing pipes, taking aluminum alloy pipes as an example, it is usually necessary to anneal the aluminum alloy pipes to eliminate residual stress, stabilize dimensions, reduce deformation and cracks, and improve the mechanical properties of aluminum alloy pipes. Annealing treatment methods are mainly divided into induction heating annealing and flame annealing. Flame annealing will pollute the environment, and it is very energy-consuming, and it will generate open flames and cause poor safety. Induction heating annealing can avoid the disadvantages of flame annealing, has the advantages of energy saving, environmental protection, safety, etc., and has high work efficiency, so induction heating annealing is widely used. The mechanical properties of the aluminum alloy tube are clo...

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Problems solved by technology

[0003] The patent No. CN107164627B discloses a furnace for circulating annealing treatment equipment for aluminum alloy tubes. The two-way air pump works in positive and negative directions through an electrical control circuit to realize nitrogen reuse and save energy. However, the device cannot accurately control the annealing temperature of the tube, and cannot Ensure uniform heating of the pipe during the annealing process

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