JP3252149B2 - Manufacturing method of clad material having high strength aluminum alloy material - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an Al--Cu system (JI
S2000 series) A method of manufacturing a clad material by combining a high-strength aluminum alloy material such as an aluminum alloy with another kind of member by explosion and producing a clad material by explosion and subsequent strain relief processing. Cracks are prevented from occurring.

[0002]

2. Description of the Related Art Conventionally, a clad material combining a high-strength aluminum alloy material and other members has been known. FIG. 2 shows a clad material 14 in which a high-strength aluminum alloy material 10 and a stainless steel material 12 are combined. The high-strength aluminum alloy material 10 is made of, for example, an Al-Cu-based aluminum alloy, and for example, A2219 is used. The stainless material 12 is made of, for example, SUS304. This clad material 14
Uses a stainless steel material 12 as a base material, a titanium material 16, a pure aluminum material (for example, A1100), a high-strength aluminum alloy material 10
Are sequentially joined by explosion. The clad material 14 produced in this manner is used as a material for a dissimilar joint for connecting, for example, a stainless steel pipe and an aluminum pipe.

A conventional process for manufacturing the clad material 14 shown in FIG. 2 will be described with reference to FIG. (1) A stainless steel material 12 (SUS304) is prepared as a base material. (2) Perform pretreatment such as surface polishing. (3) Titanium material 16 is combined as a combining material. (4) Explode. (5) Perform pretreatment such as surface polishing. (6) A pure aluminum material 18 (A1100) is combined as a joining material. (7) Explode. (8) Perform pretreatment such as surface polishing. (9) High strength aluminum alloy material 10 (A2219)
T87). (10) Explode. (11) Remove distortion with a press or level roller. (12) The product is completed.

[0004]

As a vacuum chamber of a particle accelerator such as a synchrotron, an aluminum chamber is generally used, but a stainless steel chamber may be partially used. In this case, it is necessary to connect the aluminum chamber and the stainless steel chamber with different material joints. FIG. 4A shows an example in which this dissimilar material joint is realized by flange joining using the clad material of FIG. One of the vacuum chambers 24 in FIG. 4 is constituted by the stainless steel chamber 20 and the other is constituted by the aluminum alloy chamber 22. A flange 26 made of a clad material is joined to the end of the stainless steel chamber 20 by welding 28. The flange 26 is obtained by cutting the clad material 14 of FIG. 2 as shown by a two-dot chain line 26. A flange 30 made of a high-strength aluminum alloy material (for example, A2219) is joined to an end of the aluminum alloy chamber 24 by welding 32. Flange 2
By connecting the bolts 6 and 30 with the bolts and nuts 34, the dissimilar chambers 20 and 22 are flanged together.

Since the inside of a vacuum chamber such as a particle accelerator needs to be maintained at an ultra-high vacuum, the flange joint portion has a structure that enhances sealing performance. FIG. 4B is an enlarged view of the seal portion shown in FIG. A gap 38 is formed in the inner peripheral portion of the butted surfaces 35 and 36 of the flanges 26 and 30, and edges 40 and 42 are formed in a ring shape. A ring-shaped metal gasket 50 is accommodated in the space 38, and the bolts and nuts 34 are tightened with a predetermined tightening torque, so that the edges 40 and 42 are cut into the metal gasket 50 by a predetermined amount to perform vacuum sealing.

As shown in FIG. 4 ( b ), when the edges 40, 42 of the flanges 26, 30 are inserted into the metal gasket 50 to perform vacuum sealing, if the edges 40, 42 are soft, the edges 40, 42 are crushed, and the sealing is performed. Worse. Then, when the edges 40 and 42 are crushed, it is difficult to reproduce (the edges 40 and 42 are processed and sharpened again). In some cases, the entire flanges 26 and 30 must be replaced. Therefore, when such a sealing structure is used, the butted portions of the flanges 26 and 30 need to be made of A2219T87 or the like which has high strength among high-strength aluminum alloy materials. This high strength aluminum alloy material A2219T
No. 87 is a material obtained by subjecting A2219 to a solution treatment, then cold working and then subjected to an artificial aging hardening treatment, and has a high strength. If this is used for the abutting portion of the flanges 26 and 30, the edges 40 and 42 are not crushed and the metal is not crushed. Since the gasket 50 can be easily inserted, good vacuum sealing can be performed.

However, high strength materials such as A2219T87 are fragile because they have low absorption energy against impact, and are therefore fragile.
Is made of A2219T87 or the like, there is a problem that the high-strength aluminum alloy material 10 is cracked or cracked by an impact in the explosion process (10) of FIG. 3 or the strain removal process (11) by pressing or the like. In ultra-high vacuum members, leakage may occur due to minute cracks and cracks, and the degree of vacuum may be degraded. Therefore, cracks and cracks must be reliably removed.

The present invention solves the above-mentioned problems in the prior art and provides a high-strength aluminum alloy material capable of manufacturing a clad material having a high-strength high-strength aluminum alloy material without causing cracks or cracks. It is an object of the present invention to provide a method for producing a clad material having the same.

[0009]

According to the present invention, a high-strength aluminum alloy material naturally aged after solution treatment is combined with another kind of material and joined by explosion, and then subjected to an artificial age hardening treatment after a strain relief treatment. The strength of the high-strength aluminum alloy material is increased.

[0010]

The high-strength aluminum alloy material naturally aged after the solution treatment has a lower strength than the high-strength aluminum alloy material subjected to the artificial aging hardening after the solution treatment such as A2219T87, but has a larger absorption energy with respect to impact. Therefore, it is strong against the impact due to the explosion or the distortion removing process, and can prevent the occurrence of cracks and cracks. In addition, since the artificial age hardening treatment is performed after the explosion and the strain relief treatment, the strength of the high-strength aluminum alloy material can be increased. Thereby, a clad material having a high strength and high strength aluminum alloy material can be manufactured without cracking or cracking. For example, when used for a dissimilar material joint of the vacuum chamber 24 shown in FIG. 42 without crushing the metal gasket 50
This makes it possible to obtain a good sealing property.

[0011]

FIG. 1 shows an embodiment of a method for manufacturing the clad material shown in FIG. 2 by using the present invention. The method of FIG. 1 includes the following steps. (1) A stainless steel material 12 (SUS304) is prepared as a base material. (2) Perform pretreatment such as surface polishing. (3) Titanium material 16 is combined as a combining material. (4) Explode. (5) Perform pretreatment such as surface polishing. (6) A pure aluminum material 18 (A1100) is combined as a joining material. (7) Explode. (8) Perform pretreatment such as surface polishing. (9) High strength aluminum alloy material 10 (A2219)
T4 (or T3)). A2219T4 is a solution-treated, naturally aged one (A2219T3 is a solution-treated, cold-worked, naturally aged),
Absorbed energy for impact is higher than A2219T87 or the like. (10) Explode. (11) Remove distortion with a press or level roller. FIG.
Is a result of examining the absorbed energy of A2219T4 and A2219T87, and the absorbed energy is about 3.5 kgf · m.
If it is smaller than that, cracks and cracks will occur. According to this, since the absorbed energy of A2219T87 is smaller than 3.5 kgf · m, there is a possibility that cracks and cracks may occur. However, since the absorbed energy of A2219T4 is larger than 3.5 kgf · m, there is a possibility that cracks and cracks may occur. Absent. Therefore, steps (10) and (11)
The high-strength aluminum alloy material 10 can be prevented from being cracked or cracked by the bombardment or the strain relief treatment. (12) For example, heating is performed at a temperature of 185 to 190 ° C. for 9 hours to perform an artificial age hardening treatment. Thereby, the strength of the high-strength aluminum alloy material 10 is increased, and a strength equivalent to A2219T6 is obtained. (13) The product is completed. The following table shows the characteristics of A2219T87, A2219T4 and A2219T4 after the artificial age hardening treatment. A2219T87 A2219T4 A2219T4 tensile strength after artificial age hardening (N / mm ² ) 400 315 370 Yield strength (N / mm ² ) 350 195 250 High strength with high strength and no cracks The clad material 14 of FIG. 2 having the aluminum alloy material 10 can be manufactured. Therefore, for example, if the flange 26 shown in FIG. 4 is made of the clad material 14 (the flange 30 is made of A2219T87, A2219T6, etc.), the edges 40 and 42 are not crushed and the metal gasket is inserted into the metal gasket to obtain a good sealing property. be able to.

[0012]

[Modification] In the above embodiment, the case where a clad material is formed by combining a high-strength aluminum alloy material and a stainless steel material has been described. However, the present invention can be applied to a case where a clad material other than a stainless steel material is formed. For example, when making a clad material with a copper material, after detonating a pure aluminum material (for example, A1050) using copper (oxygen-free copper or the like) as a base material, and then exploding a high-strength aluminum alloy material (A2219T4 or the like) By artificial age hardening, the strength of high strength aluminum alloy material can be increased.

The present invention can also be applied to clad materials for applications other than dissimilar joints.

In the above embodiment, the case where A2219 was used as the high-strength aluminum alloy material was described. However, the present invention can be applied to the case where a high-strength aluminum alloy material having another composition is used. The effect is remarkable in the -Cu system.

[0015]

As described above, after the solution treatment, the explosion and the strain removal treatment are performed by using the naturally aged high-strength aluminum alloy material. Cracks can be prevented from occurring. In addition, since the artificial aging hardening treatment is performed after the explosion and the strain relief treatment, the strength of the high-strength aluminum alloy material can be increased. This makes it possible to manufacture a clad material having a high-strength high-strength aluminum alloy material without causing cracks or cracks.

[Brief description of the drawings]

FIG. 1 is a process chart showing one embodiment of the present invention.

FIG. 2 is a cross-sectional view showing an example of a clad material having a high-strength aluminum alloy material.

FIG. 3 is a process chart showing a conventional method.

FIG. 4 is a sectional view showing a joint structure of a vacuum chamber using the clad material of FIG. 2;

FIG. 5 is a diagram showing a difference in absorbed energy between A2219T4 and A2219T87.

[Explanation of symbols]

 10 High-strength aluminum alloy material 12 Stainless steel material (other kinds of materials) 14 Clad material

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-48-90954 (JP, A) JP-A-54-19454 (JP, A) JP-A-49-24864 (JP, A) JP-A 50-90 133952 (JP, A) JP-A-48-89859 (JP, A) JP-B-50-7545 (JP, B1) (58) Fields investigated (Int. Cl. ⁷ , DB name) B23K 20/00-20 / 233

Claims (1)

(57) [Claims] 1. After solution treatment, a naturally aged high-strength aluminum alloy material is combined with another kind of material and joined by explosion. After strain relief treatment, artificial aging hardening treatment is performed and the strength of the high-strength aluminum alloy material is increased. A method for producing a clad material having a high-strength aluminum alloy material, characterized in that the method comprises: