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Extrusion forming method for A356 aluminum alloy

An extrusion molding and aluminum alloy technology, which is applied in the field of non-ferrous metal processing and molding, can solve the problems of low tensile strength and elongation, and achieve the effects of improving mechanical properties, facilitating control, and increasing density

Inactive Publication Date: 2016-08-17
NEW MATERIAL INST OF SHANDONG ACADEMY OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although it can greatly reduce or eliminate casting defects such as pores and cracks by extrusion casting, and improve its hardness, the tensile strength and elongation of the product obtained by using this technical solution are both low while improving its hardness.
[0003] Therefore, at present, the method of extrusion forming of A356 aluminum alloy that can improve the tensile strength and elongation remains to be studied and discovered.

Method used

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  • Extrusion forming method for A356 aluminum alloy
  • Extrusion forming method for A356 aluminum alloy
  • Extrusion forming method for A356 aluminum alloy

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] A356 aluminum alloy hot extrusion molding method, the method comprises the following steps:

[0031] (1) Preparation of extruded ingot: put the commercial A356 aluminum alloy ingot into a resistance furnace and heat it to 750°C to melt, pour the alloy liquid into the mold at a pouring temperature of 750°C, and cast a diameter of 125mm and a height of 100mm The A356 aluminum alloy extruded ingot, the surface oxide skin is removed by car to remove 1-2mm, and the surface impurities are removed.

[0032] (2) Preheat the extruded ingot to realize the homogenization treatment of the alloy. The preheating temperature is 400° C. and the holding time is 8 hours. The temperature of the preheated extrusion barrel, extrusion pad and extrusion die is 450°C.

[0033] (3) Hot extrusion process: Put the preheated extrusion die into the extrusion die cavity, and quickly extrude the preheated A356 extrusion billet and extrusion pad into the preheated extrusion barrel for extrusion. Th...

Embodiment 2

[0038] A356 aluminum alloy hot extrusion molding method, the method comprises the following steps:

[0039] (1) Preparation of extruded ingot: put the commercial A356 aluminum alloy ingot into a resistance furnace and heat it to 650°C to melt, pour the alloy liquid into the mold at a pouring temperature of 650°C, and cast an A356 aluminum alloy with a diameter of 125mm Extrude the ingot, and remove the surface scale by 1-2 mm to remove surface impurities.

[0040] (2) Preheating the extruded ingot to realize the homogenization treatment of the alloy, the preheating temperature is 480°C, and the holding time is 2h. The temperature of the preheated extrusion barrel, extrusion pad and extrusion die is 400°C.

[0041] (3) Hot extrusion process: Put the preheated extrusion die into the extrusion die cavity, and quickly extrude the preheated A356 extrusion billet and extrusion pad into the preheated extrusion barrel for extrusion. The extrusion ratio is 60, and the extrusion spee...

Embodiment 3

[0044] A356 aluminum alloy hot extrusion molding method, the method comprises the following steps:

[0045] (1) Preparation of extruded ingot: put the commercial A356 aluminum alloy ingot into a resistance furnace and heat it to 700°C to melt, pour the alloy liquid into the mold at a pouring temperature of 700°C, and cast an A356 aluminum alloy with a diameter of 125mm Extrude the ingot, and remove the surface scale by 1-2 mm to remove surface impurities.

[0046] (2) Preheat the extruded ingot to realize the homogenization treatment of the alloy. The preheating temperature is 450° C. and the holding time is 5 hours. The temperature of the preheated extrusion cylinder, extrusion pad and extrusion die is 430°C.

[0047] (3) Hot extrusion process: Put the preheated extrusion die into the extrusion die cavity, and quickly extrude the preheated A356 extrusion billet and extrusion pad into the preheated extrusion barrel for extrusion. The extrusion ratio is 70, and the extrusion...

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Abstract

The invention discloses an A356 aluminum alloy extrusion forming method, which comprises remelting and pouring an A356 aluminum alloy casting ingot to make an extrusion billet, preheating and keeping the billet warm, and then rapidly transferring the preheated billet to In the extrusion cylinder heated to a certain temperature, the billet is extruded into the cavity of the extrusion die by the extrusion machine, and finally the A356 aluminum alloy profile with high density and high mechanical properties is obtained. Through the implementation of the technical scheme of the invention, the operation method is simple and easy to control, the density of the cast A356 aluminum alloy is improved, the grain size is refined, the silicon phase is refined, and the mechanical properties of the alloy are improved.

Description

technical field [0001] The invention relates to a nonferrous metal processing and forming method, in particular to an A356 aluminum alloy extrusion forming method. Background technique [0002] A356 aluminum alloy is currently the most widely used aluminum-silicon alloy. It has the characteristics of low density and high specific strength, and is widely used in automobiles, aviation, aerospace and other fields. A356 aluminum alloy mainly exists in the form of castings, but during the casting process, it is easy to form pores, coarse grains and coarse silicon phases, which will reduce the density and mechanical properties of castings. Through the hot extrusion molding technology, the pores in the casting can be welded, the grains can be refined, the silicon phase can be refined, and the density and mechanical properties of the alloy can be improved. In the literature "Influence of Squeeze Casting on the Structure of A356 Aluminum Alloy", Li Feng and others disclosed that A1-...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B21C23/08B21C29/00B21C29/02
CPCB21C23/08B21C29/003B21C29/02
Inventor 吴建华唐守秋周吉学刘运腾韩青有李卫红王金伟张琳琳陈燕飞
Owner NEW MATERIAL INST OF SHANDONG ACADEMY OF SCI
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