JP3727041B2 - Manufacturing method of Al-Mg-Si alloy extruded material for rotating parts and sliding parts with excellent surface roughness - Google Patents

Description

【００１７】
比較例１
実施例１と同一組成を有するアルミニウム合金のビレット（直径２００ｍｍ）を連続鋳造により造塊し、実施例１と同様、５８０℃の温度で２時間の均質化処理を行い、均質化処理後、ビレットを表２に示す条件で冷却した。
【００１８】
ついで、表２に示す条件で、幅１５０ｍｍ、厚さ２ｍｍの板状体に熱間押出加工し、得られた押出材を、表２に示す条件で溶体化処理し、強制空冷を行って焼入れ、１７５℃で８時間の人工時効処理を施した。得られた試験材について、引張試験を行い、表面粗度を測定し、目視により光輝性の評価を行った。結果を表３に示す。なお、表２において、本発明の条件を外れたものには下線を付した。
【００１９】
【表２】

【００２０】
【表３】

【００２１】
表３に示すように、試験材Ｎｏ．６、Ｎｏ．７は均質化処理後の冷却速度が大き過ぎ、また試験材Ｎｏ．８は押出温度が高過ぎるため、いずれも熱間押出におて変形抵抗が大きく、押出材の表面粗度が劣っている。試験材Ｎｏ．９は溶体化処理温度が低く、また試験材Ｎｏ．１０は溶体化処理時間が短いため、いずれも十分な強度が得られない。
【００２２】
【発明の効果】
本発明によれば、表面粗度が小さく、光輝性に優れたＡｌ−Ｍｇ−Ｓｉ合金押出材が提供され、回転部品、摺動部品として有効である。[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a method for producing an Al-Mg-Si alloy extruded material for rotating parts and sliding parts having excellent surface roughness and glossiness.
[0002]
[Prior art]
6000 series Al-Mg-Si alloys represented by JIS A6063, 6N01, 6061, etc. are used as rotating parts and sliding parts. However, these alloys can reduce the cost by omitting solution treatment. In general, press hardening is performed for the purpose. In order to perform press quenching, it is necessary to sufficiently dissolve the strengthening elements Mg and Si at the billet stage before extrusion, so the cooling rate after homogenization is controlled to 100 ° C / h or more. are doing.
[0003]
However, in the above homogenization method, when there are many solid solution components, the deformation resistance increases, and the frictional resistance with the extrusion die increases, so the surface roughness of the extruded material is large, and the appearance must be glossy. However, there is a problem in applying to a sliding part having a small clearance.
[0004]
[Problems to be solved by the invention]
The present invention has been made in order to solve the above-mentioned conventional problems, and an object of the present invention is to reduce extrusion resistance in hot working of an Al-Mg-Si alloy, thereby extruding with excellent surface roughness. An object of the present invention is to provide a method for producing an Al—Mg—Si alloy extruded material having excellent surface roughness that enables obtaining a material.
[0005]
[Means for Solving the Problems]
In order to achieve the above object, the manufacturing method of the Al—Mg—Si alloy extruded material for rotating parts and sliding parts having excellent surface roughness according to claim 1 is Mg: 0.4 to 1.2%, Si : 0.2 to 0.8%, Fe as impurities is limited to 0.5% or less, and the aluminum alloy ingot composed of the remaining Al and impurities is heated at 500 to 600 ° C. for 1 to 10 hours. Then, after performing a homogenization treatment that gradually cools at a cooling rate of 50 ° C./h or less until the ingot temperature reaches 250 ° C., Ra: 0 is performed by performing hot extrusion in a temperature range of 300 to 500 ° C. .. Extruded material with a surface roughness of 10 μm or less, then solution treatment at 500-600 ° C. for 30 minutes or more , followed by quenching, artificial aging treatment at 150-250 ° C. for 1-12 hours , and 205 MPa It is characterized by having a tensile strength exceeding .
[0006]
The method for producing an Al-Mg-Si alloy extruded material for rotating parts and sliding parts having excellent surface roughness according to claim 2 is characterized in that the aluminum alloy further contains Cr: 0.5% or less, Mn: 0 It is characterized by containing one or two of 5% or less.
[0007]
The method for producing an Al-Mg-Si alloy extruded material for rotating parts and sliding parts having excellent surface roughness according to claim 3 is the method according to claim 1, wherein the aluminum alloy further contains Cr: 0.5% or less, Mn: 0 1 or 2 of 5% or less, and Cu: 0.5%.
[0008]
The meaning and content range of the alloy element of the Al—Mg—Si alloy extruded material according to the present invention will be described. Mg and Si are components that function to improve the strength, and preferred contents are 0.4 to 1 respectively. .2% and in the range of 0.2-0.8%. If it is less than the lower limit, the effect of improving the strength is small, and if the upper limit is exceeded, the extrudability is inhibited. Impurity Fe must be limited to 0.5% or less, and if it exceeds 0.5%, the surface roughness of the extruded material tends to decrease.
[0009]
Cr and Mn effectively refine the crystal grains of the hot extruded material and improve the surface roughness. The preferable content ranges of Cr and Mn are respectively 0.35% or less and. 5% or less. Cu is added to increase the strength of the extruded material. The preferred content is in the range of 0.5% or less. In the present invention, even if 0.1% or less of Ti and 0.02% or less of B added to a normal aluminum alloy are included, the performance of the extruded material is not affected.
[0010]
DETAILED DESCRIPTION OF THE INVENTION
The production of the extruded material of Al-Mg-Si alloy according to the present invention is performed by ingot-making the Al-Mg-Si alloy having the above composition by continuous casting according to a conventional method, and the obtained billet for extrusion is 500 to 600. A homogenization treatment is performed by heating at a temperature of 1 ° C. for 1 to 10 hours and gradually cooling at a cooling rate of 50 ° C./h or less. When the cooling rate after the homogenization treatment exceeds 50 ° C./h, the solid solution amount of Mg and Si increases, the deformation resistance during hot extrusion increases, and the surface roughness of the extruded material tends to increase. The slow cooling at a cooling rate of 50 ° C./h or less may be performed until the billet temperature reaches 250 ° C.
[0011]
The object of the present invention can be achieved even if the billet homogenization treatment is performed by heating at 500 to 600 ° C. for 1 to 10 hours and then by two-stage heating at 300 to 450 ° C. for 1 to 10 hours. In this case, it is not necessary to limit the cooling rate after heating to 50 ° C./h or less.
[0012]
After the homogenization treatment, an extruded material having a surface roughness Ra: 0.10 μm or less is obtained by performing hot extrusion at a temperature of 300 to 500 ° C. If the extrusion temperature is less than 300 ° C, the deformation resistance may increase and clogging may occur. If extrusion is performed at a temperature exceeding 500 ° C, Mg and Si will dissolve, and the deformation resistance will increase. The surface roughness of is likely to increase.
[0013]
After extrusion, solution treatment at 500 to 600 ° C. for 30 minutes or longer, preferably 1 hour or longer, followed by quenching and artificial aging treatment. When the solution treatment temperature is less than 500 ° C., Mg and Si are not sufficiently dissolved, and when it exceeds 600 ° C., partial dissolution is likely to occur. The artificial aging treatment after quenching is preferably performed at 150 to 250 ° C. for 1 to 12 hours.
[0014]
【Example】
Examples of the present invention will be described below in comparison with comparative examples.
Example 1
Mg: 0.58%, Si: 0.42%, Mn: 0.02%, Cu: 0.02%, Ti: 0.02%, Fe: 0.20%, balance Al and inevitable impurities A billet of aluminum alloy having a composition (diameter 200 mm) was ingoted by continuous casting, homogenized at a temperature of 580 ° C. for 2 hours, and after the homogenization, the billet was cooled under the conditions shown in Table 1.
[0015]
Next, under the conditions shown in Table 1, hot extrusion into a plate having a width of 150 mm and a thickness of 2 mm was performed, and the obtained extruded material was subjected to solution treatment at a temperature of 520 ° C. for 1 hour, followed by forced air cooling. Quenching and artificial aging treatment were performed at a temperature of 175 ° C. for 8 hours. About the obtained test material, the tension test was done, the surface roughness was measured, and the glossiness was evaluated visually. The results are shown in Table 1. As seen in Table 1, all of the test materials according to the present invention had sufficient strength exceeding 205 MPa and surface roughness of 0.10 μm or less, and exhibited excellent glitter.
[0016]
[Table 1]

[0017]
Comparative Example 1
An aluminum alloy billet (200 mm in diameter) having the same composition as in Example 1 was ingoted by continuous casting, and was homogenized for 2 hours at a temperature of 580 ° C. in the same manner as in Example 1. Was cooled under the conditions shown in Table 2.
[0018]
Next, hot extrusion processing was performed on a plate-like body having a width of 150 mm and a thickness of 2 mm under the conditions shown in Table 2, and the obtained extruded material was subjected to a solution treatment under the conditions shown in Table 2, followed by forced air cooling and quenching. An artificial aging treatment was performed at 175 ° C. for 8 hours. About the obtained test material, the tension test was done, the surface roughness was measured, and the glossiness was evaluated visually. The results are shown in Table 3. In Table 2, those outside the conditions of the present invention are underlined.
[0019]
[Table 2]

[0020]
[Table 3]

[0021]
As shown in Table 3, the test material No. 6, no. No. 7 has too high a cooling rate after the homogenization treatment, and the test material No. Since the extrusion temperature of No. 8 is too high, all have high deformation resistance in hot extrusion, and the surface roughness of the extruded material is inferior. Test material No. No. 9 has a low solution treatment temperature. Since 10 has a short solution treatment time, none of them can provide sufficient strength.
[0022]
【The invention's effect】
ADVANTAGE OF THE INVENTION According to this invention, the surface roughness is small and the Al-Mg-Si alloy extrusion material excellent in brilliancy is provided, and it is effective as a rotation component and a sliding component.

Claims (3)

An aluminum alloy ingot containing Mg: 0.4 to 1.2%, Si: 0.2 to 0.8%, limiting Fe as an impurity to 0.5% or less, and remaining Al and impurities. On the other hand, after heating at 500 to 600 ° C. for 1 to 10 hours and performing a homogenization treatment at a cooling rate of 50 ° C./h or less until the ingot temperature reaches 250 ° C., a temperature of 300 to 500 ° C. Ra: Extruded material having a surface roughness of 0.10 μm or less by hot extrusion in the region, then subjected to solution treatment at 500 to 600 ° C. for 30 minutes or more , followed by quenching, and 1 to 150 to 250 ° C. A method for producing an Al-Mg-Si alloy extruded material for rotating parts and sliding parts having excellent surface roughness, characterized by performing an artificial aging treatment for -12 hours to obtain a tensile strength exceeding 205 MPa . Aluminum alloy further Cr: 0.5% or less (excluding 0%, hereinafter the same), Mn: surface according to claim 1, characterized in that it contains one or two of 0.5% or less A method for producing an Al-Mg-Si alloy extruded material for rotating parts and sliding parts having excellent roughness. Aluminum alloy further Cr: 0.5% or less, Mn: 1 one or two of 0.5% or less, and Cu: the surface according to claim 1, characterized in that it contains 0.5% or less A method for producing an Al-Mg-Si alloy extruded material for rotating parts and sliding parts having excellent roughness.