JPH04279288A - Manufacture of metallic laminated structural body - Google Patents

Abstract

PURPOSE:To obtain the sound laminated structural body without employing a complicated treatment process by interposing the metallic member which has the melting point lower than the undermentioned metallic members as the intermediate layer member between the metallic members of the same kind or the different kinds. CONSTITUTION:The outer layer metallic member 10 and the inner metallic member 30 are joined with welding with the bottom surface plate material 40 at their under surface, with the side surface facing plate material 60, 70 at both side and surfaces and assembled to the box shape like. The intermediate layer metallic member 30 is inserted in the inside space of this assembled body, the top surface facing plate material 50 is welded at the open end surface of the upper side, and the air venting tube 80 is attached at the facing plate material 50. On the quality of the material of the outer layer metallic member 10, the intermediate layer metallic member 20 and the inner layer metallic member 30, the intermediate layer metallic member 20 is lower at the melting point that the metallic members 10, 30 of the outer layer and the inner layer. The deaeration between the metallic members10, 30 of the outer and inner layer is executed by the vacuum pump through the air venting tube 80, and it is prevented by crushing the air venting tube 80. This assembling body is inserted in the heating furnace, treated with heating in standing straight posture.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for manufacturing a metal laminated structure.

0002

[Prior Art] By laminating and integrating dissimilar metals, it is possible to have a composite of material properties that cannot be obtained with a single metal material, and it is possible to achieve the required performance while saving material costs. It is also possible to secure it. Such laminated structures are used in various fields, for example, as panel materials, piping materials, rolls, and the like.

[0003] In order to impart the desired performance to the laminated structure,
It is necessary that the interfaces between the laminated metal members be reliably connected by metallic bonding. The composite structure can be manufactured by stacking metal members on top of each other and subjecting them to pressure/heat treatment (hot isostatic pressure treatment, etc.) to diffusion bond the overlapping surfaces. Practical methods include a method of laminating metal layers by overlaying beets on the surface by TIG welding, etc., and a multi-stage casting method of injecting molten metals of different types into a mold in stages.

0004

However, the conventional manufacturing method described above requires special or large-scale equipment such as a hot isostatic pressing device, a welding overlay device, or a melting/casting device. Moreover, the manufacturing process is also complicated. The present invention provides a method for manufacturing a composite structure that does not require the above-mentioned equipment, has simple steps, and can form a reliable metallic bond at the laminated interface.

[0005]

[Means and effects for solving the problems] The method for manufacturing a laminated structure of the present invention includes interposing a metal member having a lower melting point than those metal members as an intermediate layer material between metal members of the same type or different types. It is characterized by subjecting it to heat treatment and melting the intermediate layer material to metallically bond the interfaces between the metal members.

The manufacturing method of the present invention will be explained with reference to drawings showing embodiments. FIG. 1 shows an example of manufacturing a panel material as a composite structure. (10) is a metal member (here, referred to as the outer layer) that becomes one surface layer of the panel material.
Hereinafter, "outer layer metal member"), (30) will refer to the other surface layer (
(20) is a metal member (hereinafter referred to as "inner layer metal member") that will become an intermediate layer (hereinafter referred to as "inner layer metal member"), which is interposed between these metal members (10) and (30). "Intermediate layer metal member"). The outer layer metal member in this example (
10), the inner layer metal member (30), and the intermediate layer metal member (20) sandwiched therebetween are rectangular plate-shaped bodies.

Further, (40) is a bottom abutment plate material, (50) is a top abutment plate material, (60) and (70) are side abutment plate materials, and the outer layer metal member (10) and the inner layer metal member (30) are as follows: Bottom plate material (40) on the bottom surface, side plate material (60
) (70) are joined by welding and assembled into a box shape. The intermediate layer metal member (2
0) is charged, and a top plate material (
50) are joined by welding. In addition, the top plate material (5
0) is attached with a deaeration pipe (80).

Outer layer metal member (10) and inner layer metal member (3)
The back plate materials (40) to (70) joined to the end face of 0) are
The inner space in which the intermediate layer metal member (20) is interposed is sealed, the inner space is isolated from the heating atmosphere in the subsequent heat treatment process, and the molten material of the intermediate layer metal member (20) is held within the inner space. It has the role of

Prior to heat treatment, the inner space of the laminated member assembly is degassed by vacuum suction through a degassing pipe (80), and after degassing, the degassing pipe (80) is removed by a press.
) is crushed and sealed.

As described above, deaerating the inner space of the assembly in which the intermediate layer metal member (20) is inserted is necessary to prevent the intermediate layer metal member (20) and the opposing outer layer from occurring during the heat treatment process. This is effective in preventing oxidation of the surfaces of the inner layer metal members (10) and (30) and accompanying changes in the material of the intermediate layer metal member (20), as well as ensuring close contact between the interfaces of each member.

[0011] The heat treatment of the assembly of the laminated members is carried out in a posture (upright posture) in which the overlapping surfaces of the members are oriented in the vertical direction as shown in the figure. The heat treatment can be performed in a furnace such as a gas furnace or a resistance heating furnace. Although the heating temperature is equal to or higher than the melting point of the intermediate layer metal member, excessive temperature rise must be avoided so as not to cause softening or deformation of the outer layer metal member (10) and the inner layer metal member (30).

[0012] Furthermore, the intermediate layer metal member (20) does not necessarily have to completely melt the entire amount, and the amount of melting is determined by the amount of the outer layer metal member (10) and the inner layer metal member (30).
The amount may be sufficient to fill the interface with the molten metal and form a metallic bond at the interface.

[0013] Cooling after heat treatment is performed by maintaining the same upright posture as during heating and performing directional cooling from the bottom to the top, thereby eliminating shrinkage cavities due to solidification shrinkage of the molten metal.
Defects that impair the adhesion of the interface can be prevented. In addition, if deformation such as warping or peeling of the interface due to thermal stress during the cooling process becomes a problem, take appropriate measures such as slowing down the cooling rate until the temperature drops to an appropriate range.

After the above cooling, the backing plate materials (40) to (70)
is removed by machining to obtain the desired laminate panel material. The backing plate materials (40) to (70) may be left as they are if they do not interfere with the actual use of the panel material.

FIG. 2 shows another embodiment of the present invention, in which piping,
Alternatively, an example of manufacturing a composite body having a cylindrical shape used for a roll body or the like is shown. In this example, the outer layer metal member (10) and the inner layer metal member (30) are cylindrical bodies with different pipe diameters, and the intermediate layer metal member (20) is also formed into a cylindrical shape, so that the outer layer metal member (10) and the inner layer metal member Parts (3
0).

The cylindrical outer layer metal member (10) and inner layer metal member (30) are joined and fixed to the bottom plate (40) by welding with their axes aligned, and the intermediate layer metal member (20) is attached between them. is charged, and a top plate material (50) as a lid material is joined to the upper end surface by welding.

This cylindrical composite structure is assembled as shown in the figure, and is degassed and
Manufactured through heat treatment, cooling, and optional machining.

Outer metal member (10) used in the present invention
, the intermediate layer metal member (20), and the inner layer metal member (30),
Plastically processed materials such as rolled materials, or cast materials (in the example of Fig. 2,
centrifugal force casting pipes, etc.). When used, machining to remove scale from the surface, degreasing to remove attached foreign matter, and other cleaning treatments are performed as appropriate.

Outer layer metal member (10), intermediate layer metal member (
20) and the inner layer metal member (30), the intermediate layer metal member (20) is the outer layer and the inner layer metal member (10).
) (30), except that they must have a melting point lower than that of (30), and can be freely selected and combined depending on the intended use, usage conditions, required performance, etc. of the composite structure. For example, if a member is used for heat-resistant purposes and requires uniform temperature distribution on the surface during actual use,
Outer and inner layer metal members made of heat-resistant steel (10) (30)
If copper is used as the intermediate layer metal member (20) between the two, the uneven heat on the surface of the heat-resistant steel can be effectively alleviated and eliminated by the heat diffusion effect performed through the highly thermally conductive copper layer. becomes possible.

Outer layer and inner layer metal members (10) (30)
Depending on the material combination of and the intermediate layer metal member (20),
In cases where alloying reactions at layer interfaces tend to occur during the heat treatment process, resulting in material changes in the intermediate layer metal or deterioration of peeling resistance due to embrittlement of the interfaces, etc., the alloying reactions should be prevented. It is preferable to form a suitable metal plating film on the interface as a barrier layer. For example, in the case of a combination of the heat-resistant steel and copper, nickel plating or the like is effective.

[0021] Note that the outer layer metal member (10) and the inner layer metal member (30) do not necessarily need to be made of the same material; for example, in heat-resistant applications, only the outer surface is required to be heat resistant;
If the inner surface does not require that much heat resistance, apply heat-resistant steel only to the outer layer metal member (10), and apply heat-resistant steel to the inner layer metal member (10).
30) may be made of inexpensive carbon steel or the like.

The composite structure manufactured according to the present invention is not limited to the example shown in the drawings, but may have a cylindrical body with a polygonal cross section, an L-shaped panel, or other shapes.

[0023]

[Example] Production of cylindrical composite structure Outer layer metal member (10) Centrifugal force casting heat-resistant steel pipe (Material: JIS G5122
SCH22) Pipe size (mm): outer diameter 420, inner diameter 370, length 12
00. Surface finish symbol: ▽ Intermediate layer metal member (20) Oxygen-free copper plate (JIS H3100 C1020, C
U99.96% or more) was subjected to roll forming processing, and the butt end faces were joined by TIG welding.
mm): outer diameter 369, inner diameter 321, length 1199. Surface finish symbol: ▽ Inner layer metal member (30) Centrifugal force cast pipe (Material: JIS G5121 SCS
11 stainless steel) Pipe size (mm): outer diameter 320, inner diameter 300, length 12
00. Surface finish symbol: ▽ Back plate material (40) and (50) Stainless steel plate (material: JIS SUS304) Plate size (mm): outer diameter 440, inner diameter 280, wall thickness 10.

After degreasing the surfaces of each of the above members (washing liquid: acetone), a three-layer laminated assembly was formed by welding as shown in FIG. 2, and the degassing pipe (80) (
The space between the outer layer member (10) and the inner layer member (30) is evacuated using a vacuum pump (degree of vacuum: 1 x 10-4 Torr) via a stainless steel pipe with a diameter of 8 mm. The trachea (80) is crushed and sealed. The above laminated assembly was placed in a heating furnace and heated in an upright position. Heating temperature: 1
100°C, treatment time: 2 hours. After the treatment, directional cooling was performed upward from the lower end side to 1000°C at a cooling rate of 1.5°C/min.

[0025] Bonding state of the interface According to the ultrasonic flaw detection test, the laminated interface of the laminated cylindrical body is as follows:
It was confirmed that there was a metallic bonded state over the entire circumference and the entire length.

[0026]

[Effects of the Invention] According to the method of the present invention, a sound laminated structure can be produced by bringing the laminated interfaces into close contact with each other metallically, without requiring any special equipment or complicated processing steps, and with just a heat treatment furnace. .

[Brief explanation of the drawing]

FIG. 1 is a perspective explanatory view showing an embodiment of the present invention.

FIG. 2 is an axial cross-sectional view showing another embodiment of the present invention.

[Explanation of symbols]

10: Outer layer metal member, 20: Intermediate layer metal member, 30: Inner layer metal member

Claims (1)

[Claims] Claim 1: Between metal members of the same type or different types,
A metal characterized by interposing a metal member with a lower melting point than these metal members as an intermediate layer material, subjecting it to heat treatment, and melting the intermediate layer material to metallically bond the interface between each metal member. Manufacturing method of laminated structure