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Aluminum matrix composite hot-extruded tube manufacturing method capable of reducing internal surface scratches

A technology of aluminum-based composite materials and manufacturing methods, which is applied in the field of material molding, can solve problems such as internal and external surface defects and low plasticity, and achieve the effects of improving corrosion resistance, increasing service life, and avoiding scratches

Active Publication Date: 2019-01-04
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the plasticity of aluminum matrix composites is lower than that of the corresponding matrix aluminum alloy, and it is easy to produce inner and outer surface defects during hot extrusion
At present, there is a lack of methods for the control of abrasion defects on the inner surface of aluminum matrix composite extruded pipes

Method used

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  • Aluminum matrix composite hot-extruded tube manufacturing method capable of reducing internal surface scratches
  • Aluminum matrix composite hot-extruded tube manufacturing method capable of reducing internal surface scratches
  • Aluminum matrix composite hot-extruded tube manufacturing method capable of reducing internal surface scratches

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] Example 1 Preparation of aluminum matrix composite material hot extrusion pipe

[0036] 1) Drilling the inner hole of the ingot: Take a cylindrical aluminum-based composite material ingot, and drill a cylindrical through hole coaxial with the ingot along the axis at the center of the ingot, which is the inner hole (such as Figure 6 (a));

[0037] 2) Treatment of the inner surface of the inner hole: pickling the inner surface of the inner hole of the ingot prepared in step 1), then washing with water, and drying;

[0038] 3) Pure aluminum casting: put the ingot obtained after step 2) into the mold, and pour molten pure aluminum liquid after preheating;

[0039] 4) Drill the pure aluminum part at the inner hole of the ingot: Drill a cylindrical through hole coaxial with the inner hole of the ingot along the axis at the center of the inner hole of the ingot, and the inner diameter of the through hole is 3.5mm smaller than the inner diameter of the inner hole of the ingot ...

Embodiment 2

[0054] 1) Drilling the inner hole of the ingot: Take a cylindrical aluminum-based composite material ingot, and drill a cylindrical through hole coaxial with the ingot along the axis at the center of the ingot, which is the inner hole (such as Figure 6 (b));

[0055] 2) inner surface treatment of the inner hole: sandblasting the inner surface of the inner hole of the ingot prepared in step 1), then washing with water and drying;

[0056] 3) Pure aluminum casting: put the ingot obtained after step 2) into the mold, and pour molten pure aluminum liquid after preheating;

[0057] 4) Drill the pure aluminum part at the inner hole of the ingot: Drill a cylindrical through hole coaxial with the inner hole of the ingot along the axis at the center of the inner hole of the ingot, and the inner diameter of the through hole is 1mm smaller than the inner diameter of the inner hole of the ingot;

[0058] 5) Extrusion: The ingot obtained in step 4) is preheated and heat-insulated, put int...

Embodiment 3

[0072] 1) Drilling the inner hole of the ingot: Take a cylindrical aluminum-based composite material ingot, and drill a cylindrical through hole coaxial with the ingot along the axis at the center of the ingot, which is the inner hole (such as Figure 6 (c));

[0073] 2) Treatment of the inner surface of the inner hole: pickling the inner surface of the inner hole of the ingot prepared in step 1), then washing with water, and drying;

[0074] 3) Pure aluminum casting: put the ingot obtained after step 2) into the mold, and pour molten pure aluminum liquid after preheating;

[0075] 4) Drill the pure aluminum part at the inner hole of the ingot: Drill a cylindrical through hole coaxial with the inner hole of the ingot along the axis at the center of the inner hole of the ingot, and the inner diameter of the through hole is 6mm smaller than the inner diameter of the inner hole of the ingot;

[0076] 5) Extrusion: The ingot obtained in step 4) is preheated and heat-insulated, put...

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Abstract

The invention provides an aluminum matrix composite hot-extruded tube manufacturing method capable of reducing internal surface scratches and belongs to the technical field of material molding. By casting and machining an inner hole and the end surface of a cast ingot to form a pure aluminium coating layer integrated with the cast ingot, an aluminum matrix composite hot-extruded tube with smooth internal and external surfaces is obtained under the lubrication actions of a pure aluminum layer of the inner hole of the cast ingot on an extrusion needle and an end surface pure aluminum pad on theinternal surface of the extrusion mold; and the problem that the extruded tube cannot be directly used due to internal surface scratches of the prepared extruded tube is solved.

Description

technical field [0001] The invention belongs to the technical field of material forming, and in particular relates to a method for manufacturing hot-extruded pipes of aluminum-based composite materials that reduce inner surface scratches. Background technique [0002] Aluminum matrix composite pipes have the characteristics of light weight, high strength, high modulus and low thermal expansion coefficient, and are widely used in aviation, aerospace, machinery, electronics and other fields. Pipe is a common profile, which can be directly applied to mechanical equipment, and pipes are required to have good inner and outer surface quality. Extrusion defects on the outer surface can be removed by subsequent machining, but the inner surface of the pipe with a large length and small inner diameter is difficult to machine, and the inner surface after extrusion can be used directly. Therefore, the control of inner surface defects (including scratches, etc.) of pipes is particularly...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B21C37/06
Inventor 张学习钱明芳郑忠耿林
Owner HARBIN INST OF TECH
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