JPH11291071A - Complex metallic member and manufacture thereof - Google Patents

Abstract

PROBLEM TO BE SOLVED: To manufacture a complex metallic member by which locally different functions can be realized without increasing manufacturing man-hours and number of parts. SOLUTION: An insulator 1 is provided with a high heat resistant part 5 covering near plural franched tubes 3 of an exhaust manifold 2, a heat-insulating and noise-absorbing part 6 arranged near the portion where noises are mostly concentrated near the center portion of the high heat resistant part 5, a fitting part 7 for fitting the insulator 1 to the fitting objective material of the exhaust manufold 2 by using bolt, etc., and a cover part 8 for covering the surrounding of a collecting part 4 in the exhaust manifold 2. These high heat resistant part 5, heat-insulating and noise-absorbing part 6, fitting part 7 and the surrounding in the boundary of the cover part 8 are joined with laser beam.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a composite metal member formed by joining a plurality of materials having different thicknesses to each other, and a method of manufacturing the same.

[0002]

2. Description of the Related Art Conventionally, various metal products have been manufactured by press working. In this press working, usually, a metal body is wound into a roll, a coil body is mounted on an uncoiler or the like, and the metal plate is unwound, pressed into a long strip-shaped metal plate and cut into a predetermined length, Alternatively, after the strip-shaped metal plate is cut into a predetermined length, press working is performed.

Examples of such a metal product include various covers such as a heat insulator (hereinafter, insulator) that covers an exhaust manifold of an internal combustion engine, and combustion exhaust gas that is interposed between a cylinder block and a cylinder head of the internal combustion engine. And cylinder head gaskets for sealing.

[0004] When a metal product having a three-dimensional shape and required functions that are locally different from each other is manufactured by such press working, the entire outer plate is pressed to realize such a plurality of functions. After forming by processing, locally different members are laminated on the outer plate, or a film made of a material corresponding to the function required by the film forming technology such as various coating methods is formed and the locally different functions Is to be realized.

[0005] As an example, an insulator mounted on the exhaust manifold will be described. The insulator is located at a position relatively close to the exhaust manifold, and a heat shield that performs basic heat and sound insulation functions, a seat surface where bolts for fixing the insulator to the exhaust manifold are tightened, and the exhaust manifold. Because, the heat-resistant portion is required to have heat resistance to the radiant heat from the exhaust manifold, heat insulation and sound absorption are not required as much as the other heat-shielding portion, and also as heat-resistant portion And a normal part which does not require heat resistance.

Usually, when manufacturing an insulator,
An outer plate and an inner plate made of a metal plate having substantially the same shape as each other and having a size to cover the exhaust manifold when forming a three-dimensional shape are manufactured. Since this metal plate is also used for a portion corresponding to the heat-insulating portion and the heat-resistant portion, it is necessary to select a material conforming to the heat-resistant specifications required for the heat-insulating portion and the heat-resistant portion, and a soundproofing material. is there. That is, it has relatively high heat resistance,
In addition, a material having a relatively large plate thickness is selected because the sound insulation is improved as the plate thickness is increased. A sound absorbing material is arranged and laminated in a predetermined range corresponding to the heat shield between the inner plate and the outer plate, and is drawn into a three-dimensional shape by a press device. Thereafter, the outer plate, the sound absorbing material, and the inner plate are fixed to each other by spot welding, rivets, or the like. Further, in order to increase mechanical strength and prevent cracks in bolt holes and the like formed in a range corresponding to the seat surface portion, a subsequent additional process such as mounting a metal grommet is performed.

[0007]

It is known that the insulator manufactured as described above has the following problems. The conditions relating to the heat resistance of the inner plate and the outer plate need to be set so as to satisfy the heat resistance required for a portion where the temperature is the highest in the entire insulator. Therefore, the degree of freedom in selecting materials when designing the inner plate and the outer plate is reduced. Furthermore, since a material having high heat resistance, which increases costs in terms of raw materials and surface processing, is used for the outer plate and the inner plate having a shape extending over the entire insulator, it is difficult to simplify the material configuration of the insulator. , It becomes difficult to reduce costs.

[0008] When a laminated body composed of an outer plate and an inner plate made of the above-described material is used as an insulator, it may be desired to further improve the soundproofing property locally. To improve soundproofing, a sound absorbing material is attached to the inner plate and the outer plate to absorb noise, or the thickness of at least one of the inner plate and the outer plate is increased to suppress the level of transmitted sound Means such as a configuration to be performed are assumed.

When a sound absorbing material is attached to a conventional insulator, it is necessary to add a process of attaching the sound absorbing material and a process of fixing the sound absorbing material to the inner plate and the outer plate during a manufacturing process for assembling the insulator itself. This leads to an increase in the number of manufacturing steps and an increase in cost.

In order to increase the thickness of the portion where the sound insulation is desired to be increased, the inner plate and the outer plate are formed in the shape of the entire insulator as described above. It is necessary to increase the thickness of the plate, which undesirably increases the weight of the insulator. Also,
Such an increase in the thickness of the metal material leads to an increase in material costs.

In such an insulator, for example, it is necessary to increase the mechanical strength near the mounting surface of the bolt when the bolt is mounted on an exhaust manifold (hereinafter referred to as an exhaust manifold) of an engine. This is because cracks are likely to occur due to metal fatigue or the like due to the vibration at a place where the vibration from the exhaust manifold, which is the vibration source, is directly transmitted. In order to increase such mechanical strength, the above-mentioned grommet made of metal or the like is used. In this case, the number of components increases, and a step of attaching the grommet to the insulator is required during the manufacturing process of the insulator itself, which leads to an increase in the number of manufacturing steps and an increase in cost.

The inner plate and the outer plate constituting the insulator are formed by unwinding a metal band from a metal plate coil of a predetermined material with an uncoiler or the like and punching out the same through a press machine or the like. The punched shape at that time has irregularities on the outer periphery,
In addition, since the shape is not a shape that can completely fill the metal band, such as a rectangle, for example, a large amount of useless portions will remain in the metal band after the punching process, resulting in waste of material, and The number of items cannot be increased.

As described above, although the prior art insulator requires locally different functions, it is difficult to optimally realize each function without increasing the number of manufacturing steps and the number of parts.

The present invention has been made to solve the above problems, and an object of the present invention is to provide a composite metal member capable of realizing locally different functions without increasing the number of manufacturing steps and the number of parts. It is to be.

[0015]

SUMMARY OF THE INVENTION A composite metal member according to the present invention is formed by laser welding two or more dissimilar materials having a metal surface at least in the surface direction.

In the present invention, at least one of the plurality of materials may be a laminated component in which a plurality of members are laminated.

In the present invention, the plurality of materials may be formed in a predetermined shape, and may be formed by press working after joining the ends of the plurality of materials in the planar direction to each other by laser welding.

In the present invention, there may be a case where at least the surfaces of a plurality of dissimilar materials of metal are joined to each other by laser welding, and the joined members are formed into a predetermined shape by pressing.

[0019]

As described above, the composite metal member of the present invention is formed by joining the ends of a plurality of different materials made of metal in the surface direction at least by laser welding, as described above. When a plurality of locally different functions are required, each function part required for each function is formed in advance to a specification that satisfies the requirement, and each function part is mutually joined by laser welding, Complete the composite metal member as a product.

Therefore, a metal plate having the entire shape of the composite metal member is prepared, and compared with the existing technology in which components for realizing the respective functions are added to portions corresponding to the respective functional portions of the metal plate. Then, the necessity of setting the metal plate in the existing technology so as to satisfy at least one of the plurality of functions can be eliminated, and the required specifications can be realized in the functional part having the required size and shape. This increases the degree of freedom in designing the entire composite metal member. Also,
Since it is only necessary to realize the necessary functions in the required portions of the composite metal member, the range of using high-cost materials such as materials having high heat resistance and high mechanical strength can be limited as much as possible. The material configuration of the member can be simplified, and the cost can be reduced accordingly.

Further, the step of joining together the respective functional parts manufactured in advance to the specifications satisfying the respective predetermined requirements by laser welding is a manufacturing step of the composite metal member main body. Compared with the case where the composite metal member is used, the necessity of adding a step for adding a configuration for realizing each function during the manufacturing process of the composite metal member main body in order to realize the function required for each functional part is eliminated.

Thus, according to the present invention, the number of manufacturing steps can be reduced, and the cost can be reduced accordingly. Further, since the necessary material may be used only for the necessary functional part, simplification of the material configuration of the composite metal member and reduction of the material cost can be achieved.

In the case where at least one of the plurality of different materials of the composite metal member of the present invention is formed by punching a band-shaped member unwound from a coil body, the final composite metal member has a plurality of functions. Since the parts are formed by joining together by laser welding, the functional parts manufactured in the previous step of the laser welding process are formed in an appropriate shape so as to reduce the useless remaining from the coil body as much as possible be able to. Therefore, it is possible to increase the number of coils to be taken from the coil body, and it is possible to save resources related to materials and reduce material costs.

As described above, the composite metal member of the present invention can realize locally different functions while reducing the number of manufacturing steps and the number of parts.

In the present invention, when at least one of the plurality of materials is a laminated component in which a plurality of members are laminated, at least a part of the plurality of members is used for a predetermined function such as sound absorption and heat insulation. By selecting an appropriate mode, the function required for the at least one material can be appropriately realized. In the present invention, in the case where the plurality of materials are formed in a predetermined shape and the composite metal member is formed by pressing after joining the planar ends of the plurality of materials to each other by laser welding, The member after laser processing, for example, will be processed so as to have the final product shape, but at this time, the step of adding a member for realizing the predetermined function as described above is not included, and the example is not included. As a whole, when manufacturing a product or the like having a three-dimensional shape as a whole, it can be performed while realizing the above-described effects.

[0026]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to embodiments. 1 to 6 show a heat insulator (hereinafter abbreviated as an insulator) 1 according to an embodiment of the composite metal member of the present invention. FIG. 1 is a cross-sectional view of the insulator 1 as viewed from a section line X1-X1 in FIG. 2, FIG. 2 is a front view of the insulator 1, and FIG.
FIG. 4 is a process diagram for explaining a manufacturing process for manufacturing the semiconductor device, FIG. 4 is a process diagram for explaining a part of the manufacturing process, and FIG.
6 is a diagram illustrating a part of the manufacturing process of FIG. 4.

Hereinafter, the configuration of the insulator 1 according to the present embodiment will be described with reference to FIGS. As shown in FIG. 1, for example, the insulator 1 covers an exhaust manifold (hereinafter, referred to as an exhaust manifold) 2 for discharging combustion exhaust gas from an engine of an automobile or the like, and heats the exhaust manifold 2 to supplement an engine around the engine. It is provided for the purpose of preventing the equipment from being thermally damaged, realizing a soundproofing or sound absorbing function against noise from the exhaust manifold 2, and improving the quietness of the vehicle. The exhaust manifold 2 has a plurality of branch pipes 3 connected to an exhaust port provided in a cylinder block of the engine.
Is integrated into the collecting section 4, and the combustion exhaust gas is guided to a muffler or the like disposed downstream of the collecting section 4.

The insulator 1 of the present embodiment has a shape covering the exhaust manifold 2 as a whole,
It is composed of roughly four types of parts. Insulator 1
A high heat-resistant portion 5 covering the vicinity of the plurality of branch pipes 3 of the exhaust manifold 2; and a heat insulating sound absorbing portion 6 provided near the center of the high heat resistant portion 5 near the center in FIG.
A mounting portion 7 for mounting the insulator 1 to a mounting target such as the exhaust manifold 2 using a bolt or the like; and a covering portion 8 that covers the vicinity of the collecting portion 4 of the exhaust manifold 2. The high heat resistant part 5, the heat insulating sound absorbing part 6, the mounting part 7, and the covering part 8 constitute different kinds of materials in the present invention. In the insulator 1 according to the present embodiment, the outer peripheral portions which are the end portions in the surface direction of the high heat resistant portion 5, the heat insulating sound absorbing portion 6, the mounting portion 7, and the covering portion 8, that is, the high heat resistant portion 5, the heat insulating sound absorbing portion. 6, the vicinity of the boundary between the mounting portion 7 and the covering portion 8 is laser-joined as described later to form the insulator 1.

Since the high heat resistant portion 5 covers the plurality of branch pipes 3 through which the high-temperature combustion exhaust gas just discharged from the exhaust port of the engine passes, the insulator 1
It is necessary to have a relatively high heat resistance among them. For example, an aluminum-plated steel sheet having a thickness of t1 (eg, product name: Ulster, manufactured by Nisshin Steel, heat resistance temperature: 400 to 600 ° C.)
A material with high heat resistance, such as, is selected.

The adiabatic sound-absorbing section 6 is located in the vicinity of the branch pipe 3 through which the high-temperature combustion exhaust gas passes and in the vicinity of the center of the plurality of branch pipes 3 where the loudest noise is generated. In addition to heat resistance, heat insulation and sound absorption are required. Therefore, as shown in FIG. 1, the heat insulation sound absorbing portion 6 is the same as the inner surface 9 facing the exhaust manifold 2 and made of a highly heat-resistant metal material such as the aluminum-plated steel plate having a plate thickness t <b> 2 as an example facing the outside. An outer 10 made of a metal material, and a sound absorbing material 11 in which heat-resistant inorganic fibers are formed in a mat shape as an example sandwiched between the inner 9 and the outer 10 are provided.

The thickness t2 of the inner 9 and the outer 10 is such that when the thickness is large, the heat insulating property and the soundproofing property are increased, and the inner 9 and the outer 1 are sandwiched so that the sound absorbing material 11 is interposed therebetween.
From the point that 0 needs to be formed, t2 ≦ t1 (1) is defined. The inner 9 and the outer 10 are fixed to each other at a welded portion 12 by performing spot welding at the peripheral edge thereof. Such an adiabatic sound absorbing unit 6 suppresses the degree of noise from the exhaust manifold 2 that passes through the inner 9 and the outer 10 that are thicker than other portions, and
The sound absorbing material 11 absorbs the sound to improve sound absorbing performance.

As described above, the mounting portion 7 is a mounting portion using bolts or the like. Since the weight of the insulator 1 and the vibration caused by the rotation of the engine act synergistically, high mechanical strength is required. For this reason, in the insulator 1 of the present embodiment, as an example, the inner 9 and the outer
A relatively high mechanical strength made of the same material as the material No. 0 or a stainless steel plate, preferably a metal plate having a large thickness is used to improve the mechanical strength, and the metal grommet 13 is mounted. The mechanical strength has also been improved.

With respect to the insulator 1, the covering portion 8, which is a portion other than the high heat resistant portion 5, the heat insulating sound absorbing portion 6, and the mounting portion 7, has heat resistance, heat insulating property,
This is a portion that may suppress sound absorption and mechanical strength. Therefore, the coating portion 8 is made of, for example, a galvanized steel sheet having a thickness of t3 (eg, Genecoat, trade name, manufactured by Nisshin Steel Co., Ltd., heat-resistant temperature 3).
(From 400 to 400 ° C.). Also, the thickness t3 of the covering portion 8
Is used in a portion where it is not necessary to increase the plate thickness in terms of soundproofing and mechanical strength, so that t3 <t1 <t2 (2) is defined.

The manufacturing process of the insulator 1 according to the present embodiment will be described below with reference to FIGS. In the present embodiment, each of the steps a1 to a4 in FIG. 3 is a step of preparing parts required for manufacturing when manufacturing the insulator 1 based on the manufacturing method of the present invention, and shows an example of the steps. It is. Therefore, these steps are included in the modified example of the present invention in any order. In step a1 of FIG. 3, the above-described coil body of the galvanized steel sheet is converted into a shape that becomes the covering portion 8 of the insulator 1 which is the product described with reference to FIG.
As shown in (1), a plate-shaped component 14 is prepared by punching with a press device. At this time, the component 14 is formed into an outer shape so as to become the covering portion 8 after processing such as drawing described later, and, for example, portions where the two mounting portions 7 are joined are vacant spaces 15 and 16. Is formed as

Next, in step a2 of FIG. 3, a component 17 for the mounting portion 7 is prepared as shown in FIG. 5 (2). The part 17 is formed from the coil body of the aluminum-plated steel sheet as described above into a shape to be the mounting part 7 as shown in FIG.
As shown in (2), the part 17 is formed by punching with a press device, and if necessary, the metal grommet 13 is formed.
Is prepared.

In step a3 of FIG. 3, a component 22 for the heat insulating sound absorbing section 6 shown in FIG. 5 (3) is prepared. The component 22 for the heat insulating sound absorbing unit 6 is manufactured as shown in FIGS. Hereinafter, with reference to FIG. 4 and FIG. 6, a manufacturing process of the component 22 for the heat insulating sound absorbing unit 6 will be described. In step b1 of FIG. 4, the above-described sound absorbing material 11 shown in FIG. 6A is prepared, and the inner 9 and the outer 10 shown in FIG.
Parts 18 and 19 shown in FIGS. 6 (2) and (3)
Is formed by punching out a coil body of the aluminum-plated steel sheet with a press device. In this example, the outer 1
A storage section 20 for storing the sound absorbing material 11 in the same position as the punching process is formed. In the step b2 in FIG. 4, the inner 9, outer 10, and sound absorbing materials 11 are laminated and assembled together, and the laminated body 21 is configured as shown in FIG. 6 (4). In step b3, as shown in FIG. 6 (5), spot welding is performed on predetermined welding locations such as the four corners of the laminated body 21 to integrate the laminated body 21, and the inner 9 and the outer 10 are formed. The sound absorbing member 11 and the sound absorbing member 11 are fixed to each other at the welded portion 12 to form the component 22.

In step a4 in FIG. 3, a component 23 for the high heat resistant portion 5 is prepared. As shown in FIG. 5 (4), the component 23 for the high heat resistant portion 5 is formed from the coil body of the aluminum-plated steel sheet as described above into the shape that becomes the high heat resistant portion 5 described with reference to FIG. It is formed by punching with a press device and is prepared.

Basic parts 14, 17, 22, 23 necessary for manufacturing the insulator 1 in the steps a1 to a4.
Is prepared. In step a5 in FIG. 3, the parts 14, 17, 22, and 23 prepared as described above are combined with each other, and the vicinity of the mutual boundary of the parts 14, 17, 22, and 23 is welded by a laser welding device. To join each other. Thereby, the flat bonded body 2 as shown in FIG.
4 are configured. More specifically, in this example, the component 23 for the high heat resistant portion 5, the component 17 for the mounting portion 7, and the component 14 for the covering portion 8
Are substantially formed of a single metal plate, and the vicinity of these boundary lines is mutually laser-joined.
On the other hand, the component 22 for the heat-insulating sound absorbing section 6 sandwiches the sound absorbing material 11 between the inner 9 and the outer 10 made of a metal plate, and
Since the outer 10 and the outer 10 are fixed to each other by a plurality of welds 12, for example, each of the component 23 for the high heat resistant portion 5, the component 17 for the mounting portion 7, the component 14 for the covering portion 8, and the inner 9 Laser welding near the boundary. Which of the inner 9 and the outer 10 of the component 22 for the heat insulating sound absorbing unit 6 is to be welded is appropriately selected according to the environment in which the insulator 1 is used.
May be set as welding targets.

In step a6 of FIG. 3, punching for determining the outer peripheral shape of the joined body 24 shown in FIG. 5 (5) is performed using a press device. In step a7, after the outer peripheral punching, Various press working such as deep drawing is performed on the joined body 24 in order to realize the three-dimensional shape of the insulator 1 described with reference to FIG. Thereby, the insulator 1 of the present embodiment is manufactured.

As described above, according to the present embodiment, the insulator 1 includes the component 23 for the high heat resistant portion 5 and the component 1 for the mounting portion 7.
Since the vicinity of each boundary between the component 7 and the component 14 for the covering portion 8 and the inner 9 and / or outer 10 of the heat insulating sound absorbing portion 6 is laser-joined, the insulator 1 is provided with heat resistance, sound absorbing property, and mechanical strength. When a plurality of functions that are locally different are required, for example, the high heat resistant portion 5 where each function is required,
The heat insulating sound absorbing part 6, the mounting part 7, and the covering part 8 were each formed in advance to satisfy the above-mentioned requirements, and these were mutually joined by laser welding to constitute the insulator 1.

Accordingly, as described in the prior art, a metal plate having the entire shape of the insulator 1 is prepared, and components for realizing the respective functions are provided in portions corresponding to the respective functional portions of the metal plate. The need to set the metal plate in the existing technology so as to satisfy at least one of the plurality of functions is eliminated as compared with the existing technology in which the heat-resistant portion 5 is used. What is necessary is just to implement | achieve in the functional part of required size and shape like the part 6 and the attachment part 7. FIG. As a result, the degree of freedom in designing the entire insulator 1 is increased. In addition, since it is only necessary to realize a necessary function in a necessary portion of the insulator 1, it is possible to limit as much as possible a range of using a high-cost material such as a material having high heat resistance and a material having high mechanical strength. As a result, the material configuration of the insulator 1 can be simplified, and the cost can be reduced accordingly.

In addition, the insulator 1 according to the present embodiment
In the manufacturing method of (1), the step of joining the high heat resistant part 5, the heat insulating sound absorbing part 6, the mounting part 7, and the covering part 8 to each other by laser welding is a manufacturing step of the insulator 1 body. Therefore,
As in the prior art described above, a step of adding a different configuration for realizing the functions required for each functional portion to the metal plate having the overall shape of the insulator 1 needs to be added during the manufacturing process of the insulator 1 body. Is eliminated. Thus, in the present embodiment, the man-hour for manufacturing the insulator 1 can be reduced, and the cost can be reduced.

The component 1 of the insulator 1 of this embodiment
4, 17, 18, 19, 22, and 23 are formed by punching a strip unwound from a coil of a metal strip such as the aluminum-plated steel sheet or the galvanized steel sheet, and these are mutually welded by laser welding. And the insulator 1 is formed. Therefore, the parts 14, 17, 18, 1 manufactured in the preceding step of the laser welding step
Each of 9, 22, and 23 can be appropriately shaped so as to reduce waste leftover from the coil as much as possible. Therefore, parts 14, 17, 18, 19, 2
The number of 2, 23 can be increased, and resource saving and reduction of material cost can be achieved.

Further, in the insulator 1 of this embodiment, the heat insulating sound absorbing portion 6 is formed by laminating the inner 9, outer 10 and sound absorbing material 11 and welding them with the welding portion 12, so that the area other than the sound absorbing material 11 Thus, the inner 9 and the outer 10 come into close contact with each other. Also, in the heat insulating sound absorbing section 6,
The sound absorbing material 11 is stored in a storage section 20 formed in the outer 10 as an example.

On the other hand, when the sound absorbing material is sandwiched between a pair of metal plates in the shape of the entire insulator as in the above-described prior art, a space is formed between the metal plates in a range other than the sound absorbing material. You. In such a space, the noise transmitted from the exhaust manifold 2 acts as a resonance box, and the noise transmitted to the outside may increase.

On the other hand, in the insulator 1 of this embodiment, such a space is not formed, so that noise transmitted from the exhaust manifold 2 can be efficiently absorbed and cut off.

As described above, the mounting portion 7 of the insulator 1 according to the present embodiment uses a single metal plate having a relatively high mechanical strength, such as the Ulster or stainless steel plate. As a result, when the insulator 1 is attached to the exhaust manifold 2 via a mounting bolt or the like,
Vibrations transmitted from the exhaust manifold 2 via the mounting bolts are converted into vibrations of the metal plate constituting the mounting portion 7, thereby increasing the extent of the vibration not being transmitted to the entire insulator 1.

As a result, in the insulator 1 having the mounting portion 7 of the present embodiment, of the vibrations transmitted from the exhaust manifold 2 to the insulator 1, the degree of the vibration that vibrates the entire insulator 1 can be suppressed. 2 can be improved in sound absorbing effect.

As described above, the insulator 1 of the present embodiment can realize locally different functions while reducing the number of manufacturing steps and the number of parts, and can improve the sound absorbing effect.

The heat insulator 1 described in the above embodiment of the present invention is one embodiment of the composite metal member of the present invention, and the present invention is not limited to this embodiment, and is not limited to this embodiment. It includes a wide range of variations.

[0051]

As described above, according to the present invention, when the composite metal member is required to have a plurality of locally different functions,
Each functional part for which each function is required is formed in advance to a specification that satisfies the requirement, and the functional parts are joined together by laser welding to complete a composite metal member as a product. .

Therefore, a metal plate having the entire shape of the composite metal member is prepared, and compared with the existing technology in which a component for realizing each of the functions is added to a portion corresponding to each of the functional portions of the metal plate. Then, the necessity of setting the metal plate in the existing technology so as to satisfy at least one of the plurality of functions can be eliminated, and the required specifications can be realized in the functional part having the required size and shape. This increases the degree of freedom in designing the entire composite metal member. Also,
Since it is only necessary to realize the necessary functions in the required portions of the composite metal member, the range of using high-cost materials such as materials having high heat resistance and high mechanical strength can be limited as much as possible. The material configuration of the member can be simplified, and the cost can be reduced accordingly.

Further, the step of joining the respective functional parts, which have been manufactured to the specifications satisfying the predetermined requirements in advance, with each other by laser welding is a manufacturing step of the composite metal member main body. Compared with the case where the composite metal member is used, the necessity of adding a step for adding a configuration for realizing each function during the manufacturing process of the composite metal member main body in order to realize the function required for each functional part is eliminated.

Thus, according to the present invention, the number of manufacturing steps can be reduced, and the cost can be reduced accordingly. Further, since the necessary material may be used only for the necessary functional part, simplification of the material configuration of the composite metal member and reduction of the material cost can be achieved.

In the case where at least one of the plurality of different materials of the composite metal member of the present invention is formed by punching a band-shaped member unwound from a coil body, the final composite metal member has a plurality of functions. Since the parts are formed by joining together by laser welding, the functional parts manufactured in the previous step of the laser welding process are formed in an appropriate shape so as to reduce the useless remaining from the coil body as much as possible be able to. Therefore, it is possible to increase the number of coils to be taken from the coil body, and it is possible to save resources related to materials and reduce material costs.

As described above, the composite metal member of the present invention can realize locally different functions while reducing the number of manufacturing steps and the number of parts.

In the present invention, when at least one of the plurality of materials is a laminated component in which a plurality of members are laminated, at least a part of the plurality of members is used for a predetermined function such as sound absorption and heat insulation. By selecting an appropriate mode, the function required for the at least one material can be appropriately realized.

In the present invention, the plurality of materials are formed in a predetermined shape, and the plurality of materials are pressed together after joining the ends in the surface direction of each other by laser welding to form a composite metal member. In this case, the member after the laser processing, for example, will be processed so as to have a final product shape, but at this time, a step such as addition of a member for realizing a predetermined function as described above is included. However, as an example, when manufacturing a product having a three-dimensional shape as a whole, it can be performed while realizing the above-described effects.

[0059]

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of an insulator 1. FIG.

FIG. 2 is a front view of the insulator 1. FIG.

FIG. 3 is a process diagram illustrating a manufacturing process of the present embodiment.

FIG. 4 is a process chart for explaining a part of the manufacturing process.

FIG. 5 is a diagram illustrating the above manufacturing process.

FIG. 6 is a diagram illustrating a part of the manufacturing process.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Insulator 2 Exhaust manifold 5 High heat resistant part 6 Heat insulation sound absorbing part 7 Attachment part 8 Covering part 9 Inner 10 Outer 11 Sound absorbing material 12 Welding part 13 Metal grommet 14, 17, 18, 19, 22, 23 Parts 20 Storage part 21 Laminate 24 bonded body

Claims (4)

[Claims] 1. A composite metal member comprising a plurality of dissimilar materials, each having at least a surface thereof, joined to each other by laser welding. 2. The composite metal member according to claim 1, wherein at least one of the plurality of materials is a laminated component in which a plurality of members are laminated. 3. A composite metal member wherein the plurality of materials are formed in a predetermined shape, and the planar ends of the plurality of materials are joined to each other by laser welding and then formed by press working. 4. A method of manufacturing a composite metal member in which at least surfaces of a plurality of dissimilar materials of metal are joined to each other by laser welding, and the joined members are formed into a predetermined shape by pressing. [0001]