JP2000061568A - Hollow metal material and its production - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide the hollow metal material and its production capable of efficiently producing at a low cost and easily forming a hollow part in a high precision, a large cross sectional area ratio and various cross sectional shapes. SOLUTION: The hollow metal material has a prescribed cross sectional shape, which is arranged with respectively projecting parts 3 and recessed parts 4, and is composed of plural special shape cross section materials 2 of metal, which are laminated by joining the projecting parts 3 each other so as to demarcate hollow parts 5 with the recessed parts 4. Further, in the producing method of the hollow metal material, plural special shape cross sectional plates of metal, which respectively have prescribed cross sectional shapes arranged with the projecting parts 3 and the recessed parts 4 continuously extending in the longitudinal direction, are prepared, these special shape cross sectional plates are laminated at the state the projecting parts 3 are brought into contact each other so as to demarcate the hollow parts with the recessed parts 4, the projecting parts in contact each other of the laminated special shape cross section plates are joined, and the joined special shape cross sectional plates are cut to a prescribed dimension.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hollow metal material having a hollow portion inside, which is used for the purpose of, for example, reducing the weight of a metal material, and a manufacturing method thereof.

[0002]

2. Description of the Related Art As is well known, metal materials are widely used in various technical fields, and those having characteristics suitable for their use are selected and used. On the other hand, since a metal material generally has a large specific gravity, depending on its application, weight reduction may be required. For example, a motor used for an audio device or a vehicle door mirror is preferably small and lightweight, and in that case, a metal material such as silicon steel forming the core of the motor is also lightened without changing the material. Is required. The hollow metal material is used in such a case, and is generally manufactured by punching a solid metal material by cutting with an NC machine.

[0003]

However, since the above-mentioned conventional hollow metal material is formed by mechanical cutting of a solid metal material, the production efficiency is low and waste cutting pieces are generated. There are disadvantages that the yield of materials is poor and the manufacturing cost increases. This drawback becomes particularly remarkable when the cross-sectional area ratio of the hollow portion is increased in order to reduce the weight of the metal material. In addition, when the cross-sectional area ratio of the hollow portion becomes large, the supporting force and rigidity of the metal material necessary for cutting tend to be insufficient, and thus there is a limit to the degree of weight reduction that can be obtained. Furthermore, since the holes are drilled by mechanical cutting, the positions and dimensions of the holes are likely to shift, the hollow portion cannot be formed with high accuracy, and the cross-sectional shape is also limited.

The present invention has been made to solve the above problems, and can be manufactured efficiently and at low cost, and the hollow portion can be easily manufactured with high accuracy and a large cross-sectional area ratio and various cross-sectional shapes. Hollow metal material, which can be formed
And a method for manufacturing the same.

[0005]

In order to achieve this object, the hollow metal material of the present invention has a predetermined cross-sectional shape having a projection and a recess, and the recess defines the hollow portion. It is characterized in that it is made up of a plurality of metal-made cross-section members which are laminated in a state where the protrusions are bonded to each other.

This hollow metal material is composed of a plurality of modified cross-section members having a predetermined cross-sectional shape which are laminated in a state where the projections are joined to each other, and a hollow part is defined between the recesses of adjacent modified cross-section materials. Is made. As described above, in the hollow metal material of the present invention, the hollow portion is formed by a plurality of odd-shaped cross-sectional materials that are formed in advance in a predetermined cross-sectional shape, and are laminated and joined together. It can be manufactured efficiently and at low cost as compared with.

Further, in this hollow metal material, since the hollow portion is formed as described above, the accuracy of the hollow portion, the cross-sectional area ratio and the cross-sectional shape depend on the cross-sectional accuracy and cross-sectional shape of the modified cross-sectional material, respectively. It will be. On the other hand, the modified cross-section material itself can be manufactured with relatively high cross-section accuracy, and various cross-sectional shapes can be obtained relatively easily. Therefore, the hollow portion can be formed with high accuracy and a large cross-sectional area ratio and various cross-sectional shapes, as compared with the case of the conventional cutting process. For example, it is possible to form a hollow portion having a larger cross-sectional area ratio than that of a conventional hollow metal material, whereby a lighter weight metal material can be obtained.

In order to achieve the above object, the method for manufacturing a hollow metal material according to the present invention comprises a plurality of metallic members each having a predetermined cross-sectional shape with a projection and a recess extending continuously in the length direction. A modified cross-section plate is prepared, and a plurality of these modified cross-section plates are stacked in a state where the projections are in contact with each other so that the hollow portion is defined by the recess, and the projections of the stacked multiple modified cross-section plates are in contact with each other. Are joined together, and the plurality of joined irregularly shaped cross-section plates are cut into a predetermined size.

According to this method for producing a hollow metal material, a plurality of elongated deformed cross-section plates having a predetermined cross-sectional shape, which are provided with projections and recesses continuously extending in the lengthwise direction, are prepared in advance. The hollow metal material according to the above-mentioned claim 1 can be efficiently manufactured only by cutting and cutting it into a predetermined size after stacking and joining. Further, since the material is not wasted during the cutting, the manufacturing cost of the hollow metal material can be further reduced.

In this case, it is preferable that the deformed cross-section plate is formed by a rolling deforming method.

Here, the rolling deformation processing method means that a long metal plate is brought into contact with the surface of a flat plate die having an acute tip, and a pressing roll is rolled on the metal plate to flatten the metal plate. Of pressing the metal die toward the die and moving the metal plate backward by a predetermined length along the lengthwise direction each time the rolling of the pressure roll ends (see Japanese Patent Publication No. 52-36512) and its application method. (See Japanese Patent Publication No. 2-51694). According to this rolling profile processing method, a profile cross-section plate with high cross-section accuracy can be formed, and various cross-section shapes can be easily obtained by changing the shape and arrangement of the flat plate die. Therefore, according to this manufacturing method, the hollow portion can be easily obtained with high accuracy, a large cross-sectional area ratio, and various cross-sectional shapes.

[0012]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 shows a hollow metal material according to the first embodiment of the present invention. As shown in FIG. 1, the hollow metal material 1 includes four modified cross-section materials 2
Are laminated and joined in the vertical direction.

The modified cross-section material 2 is composed of two upper and lower surface modified cross-section materials 2a and 2a and an intermediate two intermediate modified cross-section materials 2b and 2b made of the same metal such as silicon steel. The upper surface profiled cross-section material 2a has a flat upper surface, while a plurality of protrusions 3 having a flat surface and a plurality of recesses 4 having a semicircular cross section are alternately formed on the lower surface at equal intervals. The projections 3 and the recesses 4 continuously extend in a direction perpendicular to the cross section (direction C in FIG. 1). The lower surface profiled cross-section material 2a has the same structure as the upper surface profiled cross-section material 2a, and is upside down. Further, a plurality of protrusions 3 and recesses 4 similar to those of the surface profiled section material 2a are formed on both upper and lower surfaces of each intermediate profiled material 2b.

As shown in FIG. 1, these modified cross-section members 2 are vertically stacked so that the projections 3 are overlapped with each other, and the projections 3 are joined by caulking or the like.
As a result, the hollow metal material 1 is formed into a block shape as a whole, and each adjacent two modified cross-section materials 2,
The two opposed recesses 4 and 4 define a plurality of hollow portions 5 having a circular cross section and continuously extending in the direction perpendicular to the circular cross section.
The cross-sectional area ratio of the hollow portion 5, that is, the ratio of the cross-sectional area of the hollow portion 5 to the total cross-sectional area of the hollow metal material 1 is, for example, about 50.
%, Therefore, the hollow metal material 1 achieves a weight reduction of about 50%.

2 and 3 show a method of manufacturing the hollow metal material 1. In this manufacturing method, first, a required number of long surface irregular-shaped cross-section plates 6a and intermediate irregular-shaped cross-section plates 6b (deformed cross-section plates 6) are prepared. The surface modified cross-section plate 6a and the intermediate modified cross-section plate 6b are formed so as to have the same cross sections as the surface modified cross-section material 2a and the intermediate modification cross-section material 2b, respectively, and the projection 3 and the projection 3 that continuously extend in the longitudinal direction. It has a recess 4.

The modified cross-section plate 6 is manufactured, for example, by the above-described rolling modification processing method. According to this rolling profile processing method, a profile cross-section plate with high cross-section accuracy can be formed, and various cross-section shapes can be easily obtained by changing the shape and arrangement of the flat plate die. Of course, as the modified cross-section plate 6, one manufactured by another method may be used.

Next, as shown in FIG. 3, these modified cross-section plates 6 are vertically laminated so that the protrusions 3 are overlapped with each other, and the protrusions 3 are caulked, welded or bonded to each other. To join. Finally, the joined irregular-shaped cross-section plate 6 is cut into a predetermined dimension along the line AA ′ in the figure, whereby the hollow metal material 1 shown in FIG. 1 is completed.
The hollow metal material 1 is further cut into a required size as needed, and is used as a core of a motor, for example.

As described above, the hollow metal material 1 of this embodiment
According to the method, since the hollow portion 5 is formed by the plurality of odd-shaped cross-section members 2 which are formed in advance in a predetermined cross-sectional shape and are laminated and joined, the efficiency is higher than that in the case of the conventional cutting work of a metal material. It can be manufactured well and at low cost. In addition, in the present embodiment, a plurality of elongated modified cross-section plates 6
Since the hollow metal material 1 is formed by preparing in advance, laminating and joining them, and then cutting them into a predetermined size, the hollow metal material 1 can be efficiently manufactured.
Further, since no material is wasted during cutting, the manufacturing cost of the hollow metal material 1 can be further reduced. Further, since the modified cross-section plate 6 is formed by the rolling deformation processing method, high cross-section accuracy can be obtained, so that the hollow portion 5 can be formed with high accuracy.

4 to 6 show a hollow metal material and a method for manufacturing the same according to a second embodiment of the present invention. Compared with the hollow metal material 1 of the first embodiment, this hollow metal material 11 uses a modified cross-section material having a different cross-sectional shape to obtain a honeycomb-shaped hollow portion and increase the cross-sectional area ratio of the hollow portion. By doing so, the degree of weight reduction is enhanced. As shown in FIG. 4, the hollow metal material 11 has a five-layer structure including three intermediate cross-section members 12, 12, 12 and upper and lower surface materials 13, 13 covering them. A regular hexagonal protrusion 14a is formed at the center of each modified cross-section member 12,
Semi-hexagonal protrusions 14b are formed at both ends so as to protrude in the vertical direction.
Between them is a recess 15 having a relatively large width.

Similar to the first embodiment, the modified cross-section material 12 and the surface material 13 are laminated on each other via the projections 14a and 14b and joined by caulking, etc. Honeycomb-shaped hollow portions 16 are defined by the recesses 15 between each other and between the modified cross-section material 12 and the surface material 13. The cross-sectional area ratio of the hollow portion 16 is, for example, about 75%, and the degree of weight reduction is higher than that of the hollow metal material 1 of the first embodiment (about 50%).

As shown in FIGS. 5 and 6, this hollow metal material 11 also has the modified cross-section material 1 as in the first embodiment.
2 and the surface material 13 are provided with a long-sized irregular cross-section plate 17 and a surface plate 18, respectively, which are laminated and joined, and then cut to a predetermined dimension along the line BB 'in FIG. It is manufactured by This modified cross-section plate 17
Also, for example, it is manufactured by a rolling deformation processing method.

As described above, also in this embodiment, the same effect as that of the first embodiment can be obtained. Further, according to the present embodiment, by using the modified cross-section material 12 having a cross-sectional shape different from that of the first embodiment, a honeycomb-shaped hollow portion 16 different from the hollow metal material 1 is obtained, and the hollow portion 16 is cut off. By increasing the area ratio, the degree of weight reduction can be increased. According to the rolling profile processing method and the like, it is possible to easily form various profile cross-section plates having cross-sectional shapes other than those of the above two embodiments. A hollow metal material having a cross-sectional area ratio and a hollow portion having a cross-sectional shape can be easily manufactured.

The present invention is not limited to the embodiment described above and can be implemented in various modes.
For example, in the embodiment, the hollow metallic material is obtained by stacking and joining a plurality of long-sized odd-shaped cross-section plates and then cutting, but the stacking / joining step and the cutting step may be reversed. Further, the description so far has been mainly performed in the case of utilizing the hollow metal material for the purpose of reducing the weight of the metal material, the hollow metal material of the present invention is not limited to this, for example, It can be widely applied when the hollow portion is used as a fluid flow path. Further, the material of the hollow metal material shown in the embodiment is merely an example, and the present invention can be applied to any metal. Besides, the detailed configuration can be appropriately changed within the scope of the present invention.

[0024]

As described above in detail, according to the hollow metal material and the method for manufacturing the same of the present invention, the hollow metal material can be efficiently manufactured at low cost, and the hollow portion can be manufactured with high accuracy and a large cross-sectional area ratio. And, it has an effect that it can be easily formed with various sectional shapes.

[Brief description of drawings]

FIG. 1 is a perspective view showing a hollow metal material according to a first embodiment of the present invention.

FIG. 2 is an exploded perspective view showing a method of manufacturing the hollow metal material of FIG.

FIG. 3 is a perspective view showing a state after stacking and joining in FIG.

FIG. 4 is a perspective view showing a hollow metal material according to a second embodiment of the present invention.

5 is an exploded perspective view showing a method for manufacturing the hollow metal material of FIG.

FIG. 6 is a perspective view showing a state after stacking and joining in FIG.

[Explanation of symbols]

1 Hollow metal material 2 Deformed cross-section material 2a Surface profile section material 2b Intermediate profile material 3 protrusions 4 recess 5 Hollow part 6 Deformed cross-section plate 6a Surface irregular cross-section plate 6b Intermediate deformed section plate 11 Hollow metal material 12 Deformed cross-section material 14a protrusion 14b protrusion 15 recess 16 Hollow part 17 Deformed cross-section plate

Claims (3)

[Claims] 1. A plurality of metal members each having a predetermined cross-sectional shape including a protrusion and a recess, and stacked in a state in which the protrusions are joined to each other so that a hollow portion is defined by the recess. A hollow metal material, characterized in that it is composed of a modified cross-section material. 2. A plurality of metal modified cross-section plates each having a predetermined cross-sectional shape including a protrusion and a recess extending continuously in the length direction are prepared, and the plurality of modified cross-section plates are formed by the recesses. The protrusions are stacked in a state of being in contact with each other so as to define a hollow portion, the protrusions that are in contact with each other of the plurality of stacked variant cross-section plates are joined, and the plurality of joined variant cross-section plates are predetermined. A method for producing a hollow metal material, which comprises cutting to a size. 3. The method for producing a hollow metal material according to claim 2, wherein the profiled cross-section plate is formed by a rolling profile processing method.