Producing method of aluminum alloy seamless stage variable section pipe and preparation device

Abstract

The invention discloses a producing method of an aluminum alloy seamless stage variable section pipe and a preparation device. A mould adopts a multi-stage step extruding needle. The extruding steps are as follows: taking the first stage with the maximum diameter of the multi-stage step extruding needle to the middle of a working belt of an extruding die, forming a wall-thinned pipe body through the first stage with the maximum diameter of the multi-stage step extruding needle; when the length of the wall-thinned pipe reaches the design requirement, enabling the multi-stage step extruding needle to return to the second stage, taking a second stage to the middle of the working belt of the extruding die, forming a wall-thickened pipe body by the second stage of the multi-stage step extruding needle; and until the step number fits for the requirement, cutting off the shaped aluminum alloy pipe by a cutting machine. The invention can produce the aluminum alloy seamless stage variable section pipe; and the aluminum alloy seamless stage variable section pipe is high in dimensional precision, firm, and high in producing efficiency; therefore, the production cost is reduced; and the aluminum alloy seamless stage variable section pipe realizes the structural optimal design, so that the material is saved and the self-weight of the member is lightened.

Description

technical field [0001] The invention belongs to a production method of metal pipe fittings, and in particular relates to a production method and a preparation device of an aluminum alloy seamless stage variable-section pipe. Background technique [0002] Squeeze casting to form seamless pipes is a new material processing technology invented in the 1970s. It is a process of solidifying and forming liquid metal under high mechanical pressure to obtain seamless pipes. The processing technology The mold adopts a first-stage extrusion needle, and the section of the seamless pipe formed by the first-stage extrusion needle is constant, that is, the circumference and wall thickness are consistent, such as figure 1 and figure 2 shown. In special fields such as machinery manufacturing, petroleum, energy, ocean, etc., it is necessary to use pipe fittings with variable cross-section in stages. The pipe fittings can optimize the structural design and make their connection stronger, bu...

AI Technical Summary

Problems solved by technology

In special fields such as machinery manufacturing, petroleum, energy, and ocean, it is necessary to use pipe fittings with variable cross-sections in stages. The pipe fittings can optimize the structural design and make their connections stronger, but the existing technology cannot realize the production of pipe fittings with variable cross-sections in stages.

The only profile that can achieve step-change cross-section, and the existing step-change cross-section profiles can only produce two-stage stage-change end-face profiles. This profile is formed by replacing the mold and welding two parts of different cross-section profiles at the cross-section. , and there are only a dozen simple cross-section profiles at the current stage, such as: image 3 , Figure 4 and Figure 5 shown

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