Method and device for directly hot-forming bimetal composite pipe fitting from metal pipe

Abstract

The invention belongs to the technical field of bimetal composite pipe fittings and discloses a method and a device for directly hot-forming a bimetal composite pipe fitting from a metal pipe. The forming capacity and the forming temperature are determined, the formability of the pipe fitting is analyzed, and a pipe blank is subjected to blanking and assembly. Blanking is conducted according to the available pipe blank size, an inner-layer pipe sleeves an outer-layer pipe, and a uniform gap of 0.1-10 mm is kept between the inner wall of the inner-layer pipe and the outer wall of the outer-layer pipe through two supporting rings located between the two ends of the outer-layer pipe and the two ends of the inner-layer pipe; a die is assembled, free bulging is conducted, die assembly and feeding are performed, boosting pressure and shaping are performed, unloading is performed, and a part is picked up. The bimetal composite pipe fitting is obtained. An air pressure bulging method is adopted, the process is simple, and compounding and forming of the bimetal composite pipe fitting difficult to deform at the room temperature can be achieved at the same time through a single process. The deformation resistance of the pipe at high temperature is small, the plastic forming performance is high, and large plastic forming of materials difficult to deform can be achieved. The bimetal composite pipe fitting is combined through cold shrinkage, and the combination is reliable.

Description

technical field [0001] The invention belongs to the technical field of bimetal composite pipe fittings, and in particular relates to a method and a device for directly thermoforming bimetal composite pipe fittings from metal pipes. Background technique [0002] At present, the bimetallic composite pipe is composed of two metals with different properties. It combines the excellent properties of the two component metals, comprehensively utilizes the different properties of the inner tube and the outer tube, and takes advantage of the performance advantages of different alloys. Composite pipe fittings are further processed from bimetallic composite pipes, and their applications are becoming more and more extensive. [0003] In the prior art, there are many plastic forming methods for bimetallic composite pipes, such as drawing composite, extrusion composite, explosive composite, hydraulic expansion joint, electromagnetic composite, etc., but the above methods are not suitable f...

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Problems solved by technology

[0006] Through the above analysis, the problems and defects in the prior art are: (1) in the prior art, it is not suitable for the production of magnesium alloys, high-strength aluminum alloys, titanium alloys and superalloys, etc. Directly formed into composite pipe fittings

[0007] (2) In the prior art, the method of making metal double-layer composite pipe fittings requires two formings, many processes and requires the metal to have better plasticity

[0008] (3) In the prior art, the method for making metal double-layer composite pipe fittings does not consider the bonding problem between the two layers of pipes

[0009] The difficulty of solving the above problems and defects is: the difficulty of solving the above problems and defects lies in the limitation of the plasticity of the two metal pipes, it is difficult to realize the deformation and compounding of the two pipes in the same process at the same time, and make the pipe fittings have a bonding force

[0010] The significance of solving the above problems and defects is: the prior art utilizes composite pipes to reshape composite pipe fittings, which has many procedures, high cost and high energy consumption. Therefore, the forming process of directly forming bimetallic composite pipe fittings by using two kinds of metal pipes is developed. Tube forming opens up a new avenue

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