JPS6043454A - Aluminum alloy for vtr cylinder - Google Patents

Abstract

PURPOSE:To obtain the titled alloy having superior wear resistance and machinability and producing shavings with high processability during cutting by adding specified amounts of Cu, Mn, Fe, Ni, Pb and Sn to Al, controlling the amount of Mg, and adding restricted amounts of Zn, Si, Cr, Zr, Bi, Ti and B. CONSTITUTION:This alloy consists of, by weight, 4-10% Cu, 0.3-1.7% Mn, 0.2 -1.5% Fe, 0.5-3.0% Ni, 0.1-1.5% Pb, 0.1-2.0% Sn, <=0.7% Mg, one or more among <=3.0% Zn, <=3.0% Si, <=0.3% Cr, <=0.3% Zr and <=1.0% Bi, <=0.3% Ti and/or <=0.1% B and the balance Al. The alloy is comparable to 2218 alloy in strength and forgeability and is superior to it in wear resistance. The alloy produces shavings with high processability during cutting, forms no burrs during piercing, and has extremely superior machinability.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an aluminum alloy for VTR series jig, and more specifically, to an aluminum alloy for V
This invention relates to an aluminum alloy for TR cylinders.

Currently, AHS alloy (A1-10.81
11t%5i-2,1+ut%CuO,4wL%Mg
) and 2218 alloy (AI-4u+L%Cu-1,5
u+t%Mg-2,0III%Ni), etc.

However, although the AH3 alloy has excellent wear resistance, it has poor forgeability, and in particular, when machining such as drilling, Si
There is a problem that the drill will break due to hard intermetallic compounds and oxides, etc., and the machinability is poor.

As mentioned above, there are problems with AI-IS alloy, so
Moderate resistance) I/: 2218 with wear resistance and excellent forgeability
There is a tendency for many alloys of this type to be used. However, after heat treatment, the 2218 alloy has problems with chip disposal when the outer circumference is machined with a lathe as a part of the final ITR cylinder. is inferior, so pa□
This occurs. Removal of this burr requires a large amount of manpower and time, which significantly impairs production efficiency.

The present invention is based on the A)lS alloy and 2 of the currently used aluminum alloys for VTR cylinders as described above.
It was created in view of the various problems of 218 alloy,
That is, it has strength and forgeability comparable to that of 2218 alloy, but has superior wear resistance than 2218 alloy, and
Ni i' has excellent chip disposal properties during cutting, and also has no burrs during drilling, and has extremely excellent machinability.
This invention provides an aluminum alloy for R cylinders.

The VTR cylinder aluminum alloy according to the present invention is characterized by Cu'4-101IIL%, Mn0.
3-1.7u+L%, Fe O', 2-'1.5u+L
%, NiO, 5-3, Ou+t%, PlyO, 1~]
, 5+ut%, Sho, 1-2.0t%, M
g to 0.7 wt% or less, Z+13.0 wt% or less, Si 3. Ou+L% or less, Cr 0.3wL%
Below, ZrO, 3III% or less, Bi 1. O+uL
Contains one or more selected from below %,
Furthermore, it contains one or two of Ti 0.3 ψt % or less and B 2 O, ht % or less, and the remainder consists essentially of A1.

Since the aluminum alloy for VTR cylinders according to the present invention has such a structure, it mainly contains CuAl2, Al
-Precipitation hardening of Cu-Ni based compounds, furthermore, Mn, Fe
Maintains sufficient strength by solid solution of MIIAI
6. Sufficient wear resistance is maintained by Mn(Fe)A16, Al-Cu-N1 type compounds, and machinability is improved by containing Pb-3n or Pl)-3n-Bi type compounds in addition to the above compounds. It has a surprising effect on improving fatigue.

The aluminum alloy for VTR cylinders according to the present invention will be explained first.

First, the contained components and component ratios will be explained.

Cu is an element that increases strength, and the content is 4+llL%
The effect is not sufficient even if T8 is not used, and H) u+t%
If the content exceeds 100%, forgeability deteriorates. Therefore, the Cu content is set to 4 to 10 L%.

Mn slightly increases strength by solid solution, but mostly forms intermetallic compounds of MnAl6 and Mn(Fe)A16, which improves surface abrasion resistance and machinability.
There are no these effects below 3u+L%, and ], 7
If the content exceeds vIt%, a huge primary crystal compound is formed and V
This causes defects in the performance of the TR cylinder. Therefore,
Mn content shall be 0.3-1.7u+t%.

Fe1. Combined with tMn or Si, Mn(Fe)A1
．． .

No\1-FeNi-based compounds and no\1-FeSi-based compounds are made to provide machinability and wear resistance similar to Mn, but if the content is less than 0.2u+t%, these effects are not sufficient.1. At a content exceeding 51%, Mn (F
ellA 1. crystallizes a gigantic primary crystal compound. Therefore, the Fe content is set to 0.2 to 1.51%.

N1 is an element that creates Al-Cu-Ni-based compounds and improves wear resistance, strength, and machinability, and the content is 0.5u+
If it is less than L%, such an effect is not sufficient, and 3.0u1
If the content exceeds 1%, a coarse compound is formed and the forgeability is impaired. Therefore, the N1 content is between 0.5 and 3. Let it be OwL%.

The low melting point metals of SL1 and SL1 do not form a solid solution in the matrix but exist as finely dispersed particles, and Ply and Sn exhibit an extremely large effect of improving machinability when contained simultaneously. This effect is small in Pb,
If the Sn content is less than 0.1u+L% or 7μJ, the effect of improving machinability is not sufficient;
2. If the content exceeds O...t%, it will impair forgeability and surface finish. Therefore, the content is 0.11111%-
1.5wL%, and the Sn content is 0.1-2. Ou+t
%.

M is a circle that has an effect on machinability], combined with S11, M
Since g2Pb and Mg2Sn compounds are formed and machinability is impaired, the amount of h-carbon must be regulated to 0.7u+L% or less.

Although Zn has the effect of improving machinability, it impairs surface properties, so the content is limited to 3.0...t% or less.

Si has the effect of improving wear resistance and machinability, but
Since it impairs corrosion resistance and forgeability, it is better to include it in consideration of the balance between wear resistance and forgeability, but the content is 3.0
...If it exceeds 1%, forgeability and surface finish will be impaired. Therefore, the Si content is 3. Ou+L% or less.

Cr and Zr form Al-Cr-based and Al-Zr-based crystallized products, respectively, to improve wear resistance and machinability, but 0.3
If the content exceeds IIIL%, forgeability and surface finish will be impaired. Therefore, the content of Cr and Zr is 0.3wL each.
% or less.

B1 can be included in addition to Pb and Sn to further improve machinability, but the content is 1. Ou+t% or less.

T1 and B have the effect of refining the crystal grains of the ingot, uniformly dispersing crystallized substances or low melting point metals, and improving the surface finish.
, 0.11111%, respectively, a huge intermetallic compound will crystallize between A1 and impair forgeability and surface finish. Therefore, the Ti content is 0.3u+t% or less, and the B content is 0.11% or less.

Next, examples of the aluminum alloy for VTR cartridges according to the present invention will be described.

Example An aluminum alloy having the components and proportions shown in Table 1 was cast into a 195φ billet according to a conventional method, and after soaking at 475°C and 8 hours, it was extruded at a temperature of 400°C and a 63φ billet was cast. Extruded into a round bar, after roll straightening, treated with O material at 450℃ x 2 hours and cut into V
Cold forged to TR Schilling shape. Heat treatment is 520℃
After solution treatment for x60 minutes, water quenching and then tempering, 180'
C'X 8' Hr T6 treatment was performed.

A cutting test was performed by cutting the outer periphery, and the hardness was 41.
It was fixed at 11.

＼＋゛rFor one part of the R cylinder, holes were drilled after machining the sharp surface, and the occurrence of cracks was observed.

In addition, the conventional 2218 is used as a part of the VTR cylinder.
We conducted tape running tests on alloy materials and wear resistance.

The results of these investigations are shown in Table 2.

Table 2 (2) Hardness: Passed 120 or above As can be seen from Table 2 (1) < 2), the aluminum alloy for VTR cylinders according to the present invention has better machinability than the conventional 2218 alloy. was significantly improved, no flaking was observed after drilling, and wear resistance was also good. Note that the tape running properties were good.

As explained above, since the aluminum alloy for VTR cylinders according to the present invention has the above structure, it is an aluminum alloy for VTR cylinders that has excellent machinability and wear resistance. It is suitable as an alloy.

Claims (1)

[Claims] Cu 4-4-1O%, Mn 0.3-1,7u+t%
, FeO, 2-1.5Illt%, Ni0.5-3.0
iut%, Pb0.1-1.5+ut%, Sn0.1-
2.01llL%, suppresses Mg to 0.7u+L% or less, and contains Zn3. O cutting t% or less, Si 3.0ult
% or less, Cr O, 3wL% or less, Zr 0.3u+t
% or less, Bi 1.0LllL% or less, and further contains one or two selected from 'l'i 0.3+uL% or less, B O,ht% or less An aluminum alloy for VTR cylinders having excellent machinability and wear resistance, characterized in that the remainder consists essentially of A1.