High-strength and high-toughness two skew-roll piercing method for 2219 aluminum alloy pipe

Abstract

The invention discloses a high-strength and high-toughness two skew-roll piercing method for a 2219 aluminum alloy pipe, and relates to the technical field of aluminum alloy pipe machining. The methodcomprises the following steps that skew-roll piercing is conducted by adopting a perforating machine with a double-spiral conical roller; the plug advance is set to be 5-25 mm, the feeding angle of the two skew-roll perforating machine is set to be 6-21 degrees, the rolling angle is set to be 8-15 degrees, the reduction rate is set to be 5%-10%, the rotating speed of the roller is set to be 20-35r/min, and a aluminum alloy cylindrical blank is heated to 440-460 DEG C by adopting a heating furnace; the heated aluminum alloy cylindrical blank is moved to a guide chute of the two skew-roll perforating machine from the heating furnace; and the aluminum alloy cylindrical blank penetrates through a plug under the action of the roller, and the temperature of a rod blank is controlled to be 350-500 DEG C in a rolling process. According to the high-strength and high-toughness two skew-roll piercing method, three-dimensional pressing-twisting composite deformation of the aluminum alloy in thetwo-roller skew-roll piercing process is achieved, and finally the high-strength and high-toughness 2219 aluminum alloy pipe is obtained through the two-roller skew-roll piercing method.

Description

technical field [0001] The invention relates to the technical field of aluminum alloy pipe processing, in particular to a high-strength and tough two-roll cross-rolling piercing method for a 2219 aluminum alloy pipe. Background technique [0002] With the rapid development of my country's national economy and science and technology, the preparation technology and product quality of aluminum alloy materials have been greatly improved, which has led to the rapid expansion of the application field of aluminum alloys. In recent years, the demand for high-quality aluminum alloy pipes has become more and more many. [0003] At present, aluminum alloy tubes with an aspect ratio <2 are often prepared by upsetting + punching; the patent "Upsetting and Punching Combined Process and Die" introduces in detail the preparation of aluminum alloy tubes with a central hole by upsetting + punching. Disc forgings or blanks. [0004] The aluminum alloy tube with a height-to-diameter ratio o...

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Problems solved by technology

[0007] (1) The upsetting + punching process is mainly based on compression deformation, the amount of deformation is limited by the degree of compression, the overall deformation of the billet is small, and the effect of grain refinement is limited, so it is difficult to achieve the preparation of high-strength and tough tubes

[0008] (2) The upsetting + punching process is cumbersome, the production efficiency is low, and the product consistency is poor

[0010] (1) Since the rolled piece of the three-roll cross-rolling piercer only bears three-dimensional compressive stress, the central structure will not appear loose, so the resistance of the plug is large, which will easily cause the wear of the nose of the plug, the swing of the sticky material and the ejector rod, and cause the wall of the pipe to be damaged. uneven thickness

[0011] (2) The airtightness of the deformation zone of the three-roll skew rolling piercing process is poor, and the "tail triangle" defect will appear during the rolling process

[0012] (3) Three-roll cross-rolling piercing equipment requires large investment and high cost

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