JPH04371545A - Aluminum alloy sheet for pulley - Google Patents

Abstract

PURPOSE:To attain remarkable lightening weight as compared with a cold rolled steel sheet as conventional material by providing an aluminum alloy for pulley excellent in strength, particularly rotary bending fatigue resistance, and also excellent in formability in drawing deep drawing, and spinning, etc. CONSTITUTION:The alloy has a composition which consists of, by weight, 2-6% Mg, 0.005-0.2% Ti and/or 0.0005-0.02% B, and the balance essentially A l or further contains, besides the above, one or >=2 kinds among 0.02-2.0% Mn, 0.01-2.0% Cu, 0.02-1.0% Cr, and 0.01-0.3% Zr and in which the contents of Si, Fe, and Zn as impurities are limited to <=0.2%, <=0.2%, and <=0.5%, respectively.

Description

[Detailed description of the invention]

0001

[Industrial Application Field] The present invention relates to an aluminum alloy plate for pulleys, and more specifically, it has excellent strength, particularly rotational bending fatigue resistance, and improved formability in drawing, deep drawing, rotational forming, etc. .

0002

[Prior art and problems to be solved by the invention] Conventionally,
There are two manufacturing methods for pulleys; one is to obtain the final shape by cutting a steel material, and the other is to obtain the final shape by pressing a steel plate. Compared to the former, the latter is lighter, but
Further weight reduction is required.

Means for reducing weight include thinning the material by increasing its strength and replacing it with a lighter material. but,
In general, there are contradictory problems in that improving the strength deteriorates the formability, and conversely, improving the formability causes the strength to deteriorate, and materials with sufficient characteristics for use in lightweight pulleys have not been obtained.

0004

[Means for Solving the Problems] In view of this, and as a result of various studies, the present invention has developed an aluminum alloy plate for pulleys that has an excellent balance of strength and formability.

That is, one of the aspects of the present invention is that Mg: 2 to 6 wt.
%, and further contains Ti: 0.005 to 0.2 wt%
, B: 0.0005 to 0.02 wt%, and as impurities Si: 0.2 wt% or less, Fe: 0.2 wt% or less, Zn: 0.5 wt% or less. However, the remainder consists of Al and other unavoidable impurities.

Another aspect of the present invention is that Mg: 2 to 6 wt%
further contains Mn: 0.02 to 2.0 wt%, Cu
:0.01~2.0 wt%, Cr:0.02~1.0
wt%, Zr: 0.01 to 0.3 wt%, and Ti: 0.005 to 0.2.
wt%, B: 0.0005 to 0.2 wt%, and as an impurity, Si: 0.2 w
t% or less, Fe: 0.2 wt% or less, Zn: 0.5
It is characterized in that the content of aluminum is regulated to below wt%, and the remainder consists of Al and other unavoidable impurities.

[0007]

[Operation] The reasons for limiting the chemical composition in the present invention will be explained below. Mg in the first and second inventions is an element that is dissolved in the material and contributes to strength and formability, particularly to improving strength and reducing density. However, the ingredient range is 2-6wt.
% (hereinafter wt% is abbreviated as %) is that if it is less than 2%, the effect will not be sufficient, and if it exceeds 6%, coarse Al-Mg compounds will be generated in the material, which will reduce the fatigue strength and Corrosion resistance decreases.

[0008] Ti and B are elements that refine the structure and contribute to improving formability. However, the reason why the range of the components is limited as described above is that the effect is not sufficient below each lower limit, and when the upper limit is exceeded, a giant intermetallic compound is generated and moldability is deteriorated. Further, the reason why impurities such as Si, Fe, and Zn are regulated as described above is that if the content exceeds these limits, the ductility of the material will decrease and the formability will deteriorate.

[0009] Furthermore, Mn, Cu, Cr and Zr of the second invention
is an element that contributes to improving strength and formability. However, the reason for limiting the range of the components as described above is that below each lower limit, the effect is not sufficient, and when exceeding the upper limit, the effect is saturated and coarse compounds are formed, resulting in deterioration of moldability and decrease in strength. This is to invite. Note that the tempering of the present aluminum alloy is not uniquely determined, and may be appropriately selected depending on the required strength, product shape, etc.

[0010] Examples of the present invention will be described in detail below.

[Example] An alloy having the composition shown in Table 1 was cast by a conventional method,
A plate material with a thickness of 3 mm is made by hot rolling and cold rolling, and 3
The final plate was annealed at 60°C for 4 hours.

From this plate material, a poly V-groove pulley (2) having a plurality of V-grooves (1) on the cylindrical outer periphery and closed at one end as shown in FIG. 1 is formed by drawing rotation molding.
The moldability of the moldable product and the durable axial load of the moldable product were measured through a rotary bending fatigue test. This rotating bending fatigue test is shown in Figure 2.
As shown, test pulley (3) and driven pulley (
4) is rotated by connecting it with a belt (5), constantly applying a constant axial load (A), and checking for damage after 10 million rotations. To measure the durable axial load, after setting the axial load to the set axial load, the rotation speed of the test pulley was 6000 rpm,
The minimum load at which the molded product would not break was measured at 10 million revolutions. The above results are shown in Table 2.

0012

[Table 1]

[0013]

[Table 2]

As is clear from Tables 1 and 2, the alloy plates of the present invention can all be formed into poly V-groove pulleys and have high rotational bending fatigue resistance. On the other hand, it can be seen that comparative alloy plates that fall outside the composition range of the alloy plates of the present invention either have poor rotational bending fatigue resistance or cannot be formed into poly V-groove pulleys.

[0015]

As described above, according to the present invention, an aluminum alloy can be obtained that can be formed into poly V-groove pulleys and has high rotational bending resistance, and can be made from cold-rolled steel sheets of the same thickness as conventional materials. While the manufactured pulley weighs 268 g, the pulley made from the plate of the present invention weighs 100 g, which has an industrially significant effect such as making it possible to significantly reduce weight.

[Brief explanation of the drawing]

FIG. 1 is a side sectional view showing a poly V-groove pulley.

FIG. 2 is an explanatory diagram illustrating a rotating bending fatigue test.

[Explanation of symbols]

1 V groove 2 Poly V groove pulley 3 Test pulley 4 Driven pulley 5 Belt 6 Axial load

Claims (2)

[Claims] Claim 1: Contains Mg: 2 to 6 wt%, and further contains T.
i: 0.005-0.2wt%, B: 0.0005
Contains one or two of ~0.02wt%, and as impurities, Si: 0.2wt% or less, Fe: 0.2w
An aluminum alloy plate for a pulley, characterized in that Zn is regulated to 0.5 wt% or less, and the remainder consists of Al and other unavoidable impurities. [Claim 2] Contains Mg: 2 to 6 wt%, and further contains Mg.
n: 0.02-2.0 wt%, Cu: 0.01-2.
0 wt%, Cr: 0.02-1.0 wt%, Zr:
Contains one or more of 0.01 to 0.3 wt%, and further includes Ti: 0.005 to 0.2 wt%, B
: Contains one or two of 0.0005 to 0.02 wt%, as impurities, Si: 0.2 wt% or less, F
An aluminum alloy plate for a pulley, characterized in that e: 0.2 wt% or less, Zn: 0.5 wt% or less, and the remainder consists of Al and other unavoidable impurities.