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Method for eliminating coarse grains on surface of aluminum alloy barrel type extrusion part

An aluminum alloy and extrusion technology, which is applied in the field of material plastic forming, can solve the problems of low fatigue strength, poor cutting performance, and coarse grains of extrusions, so as to improve the low fatigue strength and cutting performance, and avoid the formation of grains. The effect of growing up, uniform and fine grains

Inactive Publication Date: 2021-01-12
CSIC NO 12 RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The purpose of the present invention is to provide a method for eliminating coarse grains on the surface of aluminum alloy cylinder-type extrusions, which solves the problem of coarse grains on the surface of existing aluminum alloy cylinder-type extrusions, which leads to low fatigue strength and poor cutting performance of the extrusions. Poor, problems with an orange peel appearance on the surface during anodizing

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] A method for eliminating coarse grains on the surface of a 2A12 aluminum alloy cylinder type extrusion, comprising the following specific steps:

[0026] Step 1, select the diameter as The 2A12 aluminum alloy bar is used to prepare aluminum alloy cylinder extrusions. During the preparation process, the coarse grain structure on the surface of the aluminum alloy bar is first removed by car, including cutting a cross-sectional test piece with a thickness of 20mm at the tail of the aluminum alloy bar. Carry out heat treatment on the test piece, then corrode, measure the deepest depth of the coarse crystal ring in the low-magnification structure of the test piece is 4mm, so the surface layer after the outer circle of the aluminum alloy bar is removed by turning 4mm, after turning, the diameter of the aluminum alloy bar is reduced According to the volume of the extruded part, calculate the required blanking length and complete the blanking;

[0027] Step 2, using a medium-...

Embodiment 2

[0032] A method for eliminating coarse grains on the surface of a 2A12 aluminum alloy cylinder type extrusion, comprising the following specific steps:

[0033] Step 1, select the diameter as The 2A12 aluminum alloy bar is used to prepare aluminum alloy cylinder extrusions. During the preparation process, the coarse grain structure on the surface of the aluminum alloy bar is first removed by car, including cutting a cross-sectional test piece with a thickness of 15mm at the tail of the aluminum alloy bar. Carry out heat treatment on the test piece, then corrode, measure the deepest depth of the coarse crystal ring in the low-magnification structure of the test piece is 3mm, so the surface layer after the outer circle of the aluminum alloy bar is removed by turning 3mm, after turning, the diameter of the aluminum alloy bar is reduced According to the volume of the extruded part, calculate the required blanking length and complete the blanking;

[0034]Step 2, using a medium-t...

Embodiment 3

[0039] A method for eliminating coarse grains on the surface of a 2A14 aluminum alloy cylinder type extrusion, comprising the following specific steps:

[0040] Step 1, select the diameter as The 2A14 aluminum alloy bar is used to prepare aluminum alloy cylinder extrusions. During the preparation process, the coarse grain structure on the surface of the aluminum alloy bar is first removed by car, including cutting a cross-sectional test piece with a thickness of 20mm at the tail of the aluminum alloy bar. Carry out heat treatment on the test piece, then corrode, and measure the deepest depth of the coarse crystal ring in the low-magnification structure of the test piece is 5mm, so the surface layer after the outer circle of the aluminum alloy bar is removed by turning 5mm, after turning, the diameter of the aluminum alloy bar is reduced According to the volume of the extruded part, calculate the required blanking length and complete the blanking;

[0041] Step 2, using a med...

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PUM

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Abstract

The invention discloses a method for eliminating coarse grains on the surface of an aluminum alloy barrel type extrusion part. The method includes the steps that in the process of preparing the aluminum alloy barrel type extrusion part, coarse grain structures on the surface of an aluminum alloy bar are turned off firstly, the aluminum alloy bar is then heated, a mold used for extrusion forming issubjected to preheating treatment, and then extrusion forming is conducted on the aluminum alloy bar, and finally, the extrusion part is subjected to quenching and aging treatment, the aluminum alloybarrel type extrusion part without surface coarse grains is prepared. The grains on the surface of the aluminum alloy barrel type extrusion part are uniform and fine, the grain size grade is 1-2, thefatigue strength and the cutting performance of the aluminum alloy barrel type extrusion part are improved, and the quality of an oxide film on the surface of the aluminum alloy barrel type extrusionpart is also improved.

Description

technical field [0001] The invention belongs to the technical field of plastic forming of materials, and relates to a method for eliminating coarse crystals on the surface of aluminum alloy cylinder-like extrusion parts. Background technique [0002] Extrusion molding is to apply external force to the metal billet placed in the mold cavity (or extrusion cylinder), forcing the metal to extrude from the cavity to obtain the desired end face shape, size, and extrusion parts with certain mechanical properties. plastic processing method. According to the metal plastic flow direction, extrusion molding can be divided into forward extrusion, reverse extrusion, composite extrusion and radial extrusion; according to the temperature of the metal blank during extrusion, extrusion molding can be divided into cold extrusion and warm extrusion. Pressing and hot extrusion. [0003] At present, the extrusion molding method used for aluminum alloy cylinder parts is reverse hot extrusion. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23P15/00B21C37/06B21C29/00B21C23/00B21C23/20B21C23/21B21C29/04C22F1/04
CPCB23P15/00B21C37/06B21C29/003B21C29/04B21C23/002B21C23/205B21C23/217C22F1/04C22F1/002
Inventor 雷超李萌来钰人康关军乔博赵恒义贺冠雄
Owner CSIC NO 12 RES INST