JPH0699288A - Method for joining metal base composite material - Google Patents

Abstract

PURPOSE:To precisely join without breaking or deforming even in the case of a heat treatment by using a deformation preventing jig being faithfully along a L-shaped member form. CONSTITUTION:In the case of joining a L-shaped member 5 and the flat plate 6 of a metal base composite member material, a jig has the curved surface 11 having the same curvature with the curvature of radius of the out side of bent part of the L-shaped member 5, the thickness of an end face 9' at the lower end of the curved surface 11 is made to a measure 0.5mm due to the view point of the limit of working and the functional stability keeping, etc., and considered so that the L-shaped member is prevented from generating defects by making round off the corner. Next, a jig 10 which presses the flat plate 6 to the L-shaped member 5 executes the prevention of inner side deformation. This curved surface 12 is made to match with the curvature of radius of the inner side of the L-shaped member 5. This pairs 5, 6 to be joined and the jigs 9, 10 are sealed in vessels 13, 14 of metal, these are closely sealed with the welding part and the joining is executed by pressurizing with the heat hydrostatic pressure.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for joining an L-shaped member of metal matrix composite material to a flat plate member.

[0002]

2. Description of the Related Art In recent years, energy saving and energy efficiency have been advanced, and accordingly, demands for material characteristics have become higher in function and higher in performance. Along with this, metal-based composite materials are starting to attract attention. Metal-based composite materials are mainly used in metals such as Al, Ti or their alloys,
It is a material in which ceramic fibers, carbon fibers, etc. are dispersed as a reinforcing material, and as a material having excellent specific strength and specific rigidity, its application fields are widely considered from the aviation and space fields to the sports / leisure fields. However, on the other hand, its difficult workability hinders its spread. As one of the means for solving this problem, a method of joining members of a metal matrix composite material to make a part having a complicated shape is considered, and research and development are being promoted by each company and research institute. For example, a method of joining a metal matrix composite material by applying a pressure to a constituent material of the metal matrix composite material as described in JP-A-57-154385 and performing a diffusion heat treatment under this stress has been studied. In addition, Japanese Examined Japanese Patent Publication Sho 62-19
As disclosed in Japanese Patent No. 9276, after the fibers are exposed from the joint surface by etching, the joint surfaces are superposed on each other and diffusion heat treatment is performed, or an insert material is added, or a heating method is performed at a temperature higher than the solidus temperature of the matrix metal, and the joint method, JP-A-6
As disclosed in Japanese Patent Publication No. 2-3862, after exposing the fibers on the joint surface, the exposed fibers are crossed with each other, and a joining material in a molten state is supplied to the crossing portion to join the fibers. ing.

However, all of the above methods are currently limited to application examples such as butt joining of plate materials and bar materials, and it is unknown whether or not they are suitable as a joining method for the metal matrix composite material. Is. In addition, as a method for joining metal materials, the joint portion between metal materials is vacuum-sealed in a metal container, and then the joint portion is pressurized by, for example, hydrostatic pressure, and heated to directly or through the insert material. A method of diffusion bonding and a method of brazing using a brazing material are known. In the method of joining by vacuum sealing, heating and isostatic pressing, from the viewpoint of preventing the joint surface from being oxidized and preventing the joint force from being lowered due to gas intervening on the joint surface, the above-mentioned metal-base composite material joining method Can be said to be promising. But,
In consideration of practical use, when joining a metal-based composite material, for example, in order to utilize its lightness, a thin flat plate may be joined with an L-shaped reinforcing material to manufacture a lightweight and highly rigid plate member. In this case, the L-shaped member has a problem that the bending portion is broken due to the rigidity of the reinforcing fiber during the bonding heat treatment, or the bending angle becomes small and a sound bonding member cannot be formed.
Further, when the joining surface is a curved surface, there are problems inherent in joining the metal-based composite material such that good joining of the joining surface cannot be obtained, and joining at a predetermined position becomes difficult. In view of the present situation, the present invention does not cause damage or deformation of the L-shaped member and accurately joins the L-shaped member and the flat plate of the metal-based composite material when using the joining method of joining by heating and pressurizing after the vacuum sealing. It provides a possible method.

[0004]

DISCLOSURE OF THE INVENTION The present invention provides a joining member in which a bending / deformation preventing jig is provided along the bent portion of the L-shaped member when joining the L-shaped member and the flat plate of the metal matrix composite material. After vacuum encapsulating the jig in a metal container and heating and pressurizing it, there is no damage or deformation, and the point is that the jig is joined accurately. The present invention is applied not only to joining using hydrostatic pressing as a means for pressurization, but also to joining using other pressing means.

[0005]

The present invention will be described below based on its embodiments. Now, consider a case where an L-shaped member of a metal-based composite material and a flat plate as shown in FIG. 1 are joined. 1A is an L-shaped member, and FIG. 1B is a flat plate. Generally, in a metal-based composite material, reinforcing fibers are arranged in a plurality of directions as shown by 3 and 4 in FIG. FIG. 2 shows the L-shaped member 5 of this metal-based composite material.
It is a schematic diagram which shows the situation change at the time of heating and isostatic pressing after combining and flat plate 6 and vacuum-sealing. Figure 2 (a)
Shows before heating, and FIG. 2 (b) shows after heating / hydrostatic pressing, that is, after joining. In this L-shaped member, when the direction of the reinforcing fiber is arranged in the bent portion of the L-shaped member so as to intersect in the lengthwise direction, as in the case of the reinforcing fiber 4 in FIG. The fibers are bent at the bend 1 of the L-shaped member. Therefore, during joining, the matrix metal softens due to heating, and due to the rigidity of the reinforcing fiber,
As shown in (b), the L-shaped member is deformed and the bending angle 2 becomes large, so that a predetermined shape cannot be obtained. Then, for example, in FIG.
It is conceivable that a jig 7 for preventing deformation is provided along the spine of the L-shaped member to heat and hydrostatically press as shown in FIG. However, in this case, as shown by 8 in FIG. 3B, in the case of a reinforcing fiber having a high rigidity, there arises a problem that the matrix metal softened at a high temperature is broken at the bent portion 1 of the L-shaped member.

Therefore, in the present invention, a jig for preventing damage and deformation is finally used so that such a breaking phenomenon does not occur. A schematic diagram of an example thereof is shown in FIG. Figure 4
In (a), 9 is a jig for preventing bending and damage.
4B is an enlarged view of FIG. 9, but the portion 11 has a curved surface along the L-shaped member with the same curvature as the radius of curvature of the curved portion outside the bent portion of the L-shaped member. The thickness of the end surface 9'is set to about 0.5 mm from the viewpoints of machining limit, stable maintenance of functions, etc., and the corners prevent the surface of the L-shaped member from being damaged. Figure 4 (a)
Inside, 10 is a jig for preventing deformation of the inside of the L-shaped member. FIG. 4C is an enlarged view of 4. 1 in FIG. 4 (c)
The portion 2 is attached to the L-shaped member in accordance with the inner radius of curvature of the L-shaped member. A peeling material is applied to the surfaces of these two types of jigs in advance so as not to be bonded to a bonded product and a container for vacuum sealing described later. Then, after arranging these two kinds of jigs, as shown in FIG.
The bonding pairs 5 and 6 and the jigs 9 and 10 are vacuum-sealed in the units 3 and 14.

Reference numeral 15 in FIG. 5 denotes a joint portion, for example, a welded portion. By utilizing the shape of the metal vacuum sealing container, it is possible to easily position the joining position between the flat plate and the L-shaped member. Further, in FIG. 5, the vacuum enclosure 14 that is in full contact with the flat plate has a thickness of at least three times that of the flat plate material so as to have rigidity, so that deformation of the flat plate material can be suppressed. A brazing material or an insert material may be arranged on the joint surface. As described above, the assembled vacuum-sealed joining pair is joined by hot isostatic pressing as shown in FIG. The joining conditions are appropriately selected according to the type of metal matrix composite material. In this way, by using the two kinds of jigs shown in FIG. 4, the flat plate of the metal-based composite material and the L-shaped member can be accurately joined without damage or deformation. Furthermore, since the hydrostatic pressure is applied, the bonding surface can be satisfactorily brought into close contact even when the bonding surface is a curved surface.

[0008]

EXAMPLE An Al alloy base S as shown in FIG. 7 using the present invention
The flat plate of the iC fiber reinforced composite material and the L-shaped member were vacuum sealed in a metal container and joined by heating and isostatic pressing. An Al alloy brazing material was placed on the joint surface. The results are shown in Table 1 together with those of the comparative example. As a comparative example, a case of brazing in a furnace and a case of vacuum encapsulation, heating / hydrostatic pressure bonding without jigs 1 and 2 and without jig 2 are shown. In the case of brazing, the bending portion of the L-shaped member was damaged, and the bending angle of the L-shaped member was further increased. In addition, the degree of parallelism between the two L-shaped members is poor. Without the jigs 1 and 2, the bending portion of the L-shaped member was damaged, and the bending angle of the L-shaped member was increased. However, the joining accuracy has improved. When the jig 2 is not used, the bending portion of the I-shaped material is not damaged, but the L-shaped member is deformed so as to be lifted from the jig 1. In comparison with these, when the two types of jigs according to the present invention are used together, the flat plate and the L-shaped member are both joined with high accuracy and without breakage or deformation.

[0009]

[Table 1]

[0010]

As described above, in the present invention, when joining a flat plate member and an L-shaped member of a metal matrix composite material, two kinds of joining jigs are used and both members and the jig are made of metal. After sealing in a container in vacuum, heating and hydrostatic pressing can bond both members with high accuracy without damage or deformation.
As a result, it is possible to expand the application of the metal matrix composite material to the fields of aircraft and space where higher quality and accuracy are required.

[Brief description of drawings]

FIG. 1 (a) shows L of a metal matrix composite material to be joined in the present invention.
A mold member, (b) is a flat plate of a metal-based composite material, which is also joined in the present invention.

FIG. 2A is a schematic view of a joining pair before joining when heating / hydrostatic joining is performed without using a jig. (B) is a schematic diagram after joining of the joining pair in the case of heating / hydrostatic joining without using a jig.

FIG. 3 (a) is a schematic view of a joining pair before joining when heating / hydrostatic joining is performed by using a deformation preventing jig on the back of the L-shaped member, and FIG. Schematic diagram after joining the joining pair when heating and hydrostatic joining are performed using a jig for preventing bending deformation,

FIG. 4 (a) is a schematic view of a joining pair equipped with a jig for preventing deformation of an L-shaped member according to the present invention, and FIG. 4 (b) is a schematic view of a jig for preventing bending and damage of the L-shaped member, (C) is a schematic view of a deformation preventing jig inside the L-shaped member,

FIG. 5 is an example of a process of mounting the jig of the present invention and vacuum sealing in a vacuum sealing container for hot isostatic pressing.

FIG. 6 is a schematic view of a hot isostatic pressing facility,

FIG. 7 is a schematic view of a joining pair of an L-shaped member and a flat plate of a metal matrix composite material joined according to the present invention.

[Explanation of symbols]

1 Bent portion 2 Bent angle 3 Reinforcing fiber direction in the same direction as the length direction of L-shaped member 4 Fiber direction having an angle with respect to the length direction of L-shaped member 5 L-shaped member 6 Flat plate 7 Bending prevention jig 8 L Damaged part of bent part of mold member 9 Improved jig for preventing bending and damage 10 Jig for preventing deformation inside L-shaped member 11 Part of jig 9 in contact with bent part outside L-shaped member 12 L-shaped member The part of the jig 10 that contacts the inside of the bent portion of the container 13 The lid of the vacuum sealing container 14 The vacuum sealing container 15 The joining part of the vacuum sealing container

[Procedure amendment]

[Submission date] June 2, 1993

[Procedure Amendment 1]

[Document name to be amended] Statement

[Correction target item name] 0007

[Correction method] Change

[Correction content]

Reference numeral 15 in FIG . 6 denotes a joint portion, for example, a welded portion. By utilizing the shape of the metal vacuum sealing container, it is possible to easily position the joining position between the flat plate and the L-shaped member. Further, in FIG. 5, the vacuum enclosure 14 that is in full contact with the flat plate has a thickness of at least three times that of the flat plate material so as to have rigidity, so that deformation of the flat plate material can be suppressed. A brazing material or an insert material may be arranged on the joint surface. As described above, the assembled vacuum-sealed joining pair is joined by hot isostatic pressing as shown in FIG. The joining conditions are appropriately selected according to the type of metal matrix composite material. In this way, by using the two kinds of jigs shown in FIG. 4, the flat plate of the metal-based composite material and the L-shaped member can be accurately joined without damage or deformation. Furthermore, since the hydrostatic pressure is applied, the bonding surface can be satisfactorily brought into close contact even when the bonding surface is a curved surface.

[Procedure Amendment 2]

[Document name to be corrected] Drawing

[Name of item to be corrected] Figure 5

[Correction method] Change

[Correction content]

[Figure 5]

 ─────────────────────────────────────────────────── ─── Continuation of front page (72) Yutaka Morimoto 20-1 Shintomi, Futtsu-shi, Chiba Nippon Steel Co., Ltd. Technology Development Division (72) Takashi Tanaka 20-1 Shintomi, Futtsu-shi, Chiba Made by Shin Nippon (72) Inventor Satoshi Yamada Inside the Advanced Technology Research Laboratories, Nippon Steel Co., Ltd. 1618 Ida, Nakahara-ku, Kawasaki-shi, Kanagawa

Claims (3)

[Claims] 1. An L-shaped member and a flat plate member of a metal matrix composite material,
Alternatively, when joining the L-shaped member of the metal-based composite material and the flat plate member of the metal, a jig for preventing damage and deformation of the L-shaped member is aligned with the L-shaped member, and further vacuum sealed in a metal container. A method for joining a metal matrix composite material, which comprises heating and pressurizing. 2. An L-shaped member and a flat plate member of a metal matrix composite material,
Alternatively, when joining an L-shaped member of a metal-based composite material and a flat plate member of metal, a brazing material is placed on the joint surface, and a jig for preventing damage and deformation of the L-shaped member is aligned with the L-shaped member. A method for joining a metal-based composite material, comprising vacuum-sealing in a container made of metal, heating to a temperature not lower than the melting temperature of the brazing material and not higher than the melting temperature of the metal-based composite material, and further applying pressure. 3. An L-shaped member and a flat plate member of a metal matrix composite material,
Alternatively, when joining an L-shaped member made of a metal-based composite material and a flat plate member made of a metal, an insert material is arranged on the joining surface.
Align the L-shaped member with a jig to prevent damage and deformation of the mold member,
A method for joining a metal-based composite material, further comprising vacuum-sealing in a metal container, heating to a temperature not higher than a melting temperature of the insert material and the metal-based composite material, and further applying pressure.