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Gapless extrusion method for aluminum alloy seamless tube

An extrusion method and technology for seamless pipes are applied in the direction of metal extrusion, metal containers to be extruded, and metal processing equipment. Good quality, good uniformity, and improved production efficiency

Active Publication Date: 2020-04-17
广东华昌集团有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved by the present invention is to solve the problem of uneven wall thickness of seamless aluminum alloy extruded pipes in the current industry, and propose a gapless extrusion method without upsetting

Method used

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  • Gapless extrusion method for aluminum alloy seamless tube
  • Gapless extrusion method for aluminum alloy seamless tube
  • Gapless extrusion method for aluminum alloy seamless tube

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] Such as figure 1 shown, using solid ingot extrusion 6061 aluminum alloy seamless pipe. First put The ingot is machined to its outer diameter to Change the inner diameter to The entrance section of the extrusion barrel lining is processed into a conical flare, the cone angle is controlled at 3-5°, the length of the conical section is controlled at 50mm; the entrance fillet is controlled at R5mm; the processed extrusion with a conical entrance The inner lining of the press cylinder is assembled with the outer casing of the extrusion cylinder by the conventional hot charging method, and preheated to 440°C by the conventional method; the extruded ingot is heated to 470°C by the conventional method; the heated extruded ingot is used The conventional method is to transfer from the heating furnace to the horizontal extruder, apply pressure through the extrusion rod and the extrusion pad, push the extruded ingot from the conical inlet into the extrusion cylinder to th...

Embodiment 2

[0018] Such as figure 2 shown, using an outer diameter of hollow ingot extrusion 7005 aluminum alloy seamless pipe. first to The solid ingot is machined to its outer diameter to the outer diameter And in the center of the ingot machine a diameter of The circular hole; the inner diameter is The entrance section of the extrusion cylinder lining is processed into a conical flare, the cone angle is controlled at 5°, the length of the conical section is controlled at 45mm; the entrance fillet is controlled at R5mm; the processed extrusion cylinder with a conical entrance The inner liner is assembled with the outer casing of the extrusion cylinder by the conventional hot-charging method, and preheated to 440°C by the conventional method; the extruded billet is heated to 475°C by the conventional method; the heated extruded billet is heated by the conventional method Transfer from the heating furnace to the horizontal extrusion machine, and then use the extrusion rod to ...

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Abstract

The invention discloses a gapless extrusion method for an aluminum alloy seamless tube. An inlet segment of a liner of an extrusion barrel in the extrusion method is processed into a cone-shaped flaring, and the inner diameter of an extrusion segment from a flaring segment is slightly smaller than the outer diameter of an extrusion ingot. The innovative point of the invention is primarily adoptingan extrusion ingot blank, the outer diameter of which is slightly smaller than the inner diameter of the liner of the extrusion barrel. In order to push the extrusion ingot into the extrusion barrelsmoothly, the inlet end of the liner of the extrusion barrel is processed into a cone-shaped horn mouth. When extrusion is started, a certain pressure is applied by an extrusion bar and an extrusion pad to push the heated extrusion ingot blank from a cone-shaped inlet to the extrusion barrel till the bottom. As the outer diameter of the extrusion ingot blank is slightly greater than the inner diameter of the extrusion barrel, the ingot blank deforms plastically to a certain extent in the pushed process and extrude all air in the extrusion barrel, and the extrusion barrel is filled fully without any gaps. Therefore, threading and extrusion forming are carried out directly without upset-extruding thereafter.

Description

technical field [0001] The invention belongs to the technical field of manufacturing non-ferrous metal materials, and in particular relates to a gapless extrusion method for aluminum alloy seamless pipes. Background technique [0002] At present, there is a large demand for high-performance aluminum alloy seamless pipes in various fields such as oil drilling, marine engineering, military equipment, ships, and nuclear power. Aluminum alloy seamless pipes are generally formed by extrusion. For high-strength aluminum alloy seamless pipes, hollow ingots are usually extruded, and for medium and low-strength aluminum alloys, solid extruded ingots are usually used for perforation and extrusion. One of the main defects in the extrusion of aluminum alloy seamless pipe products is the uneven wall thickness of the extruded pipe, which is often referred to as eccentricity defects in the engineering field. The main reasons for uneven pipe wall thickness include: low equipment precision...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B21C23/08B21C27/00
CPCB21C23/085B21C27/00
Inventor 潘伟深唐性宇武卫社周明君
Owner 广东华昌集团有限公司
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