JP2010075984A - Metallic structure and method of manufacturing metallic structure - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a metallic structure in which the end faces of a plurality of openings installed in both edge parts by extending slits formed on a metallic sheet in both edge parts are not acute and safety concerns are eliminated, and method of manufacturing the metallic structure. <P>SOLUTION: Curved-surface-like projecting and recessed parts 57, 58 which become the outside of the openings 54 are formed in the outer edge parts in both ends of a metallic sheet 51 and also, after forming the plurality of slits 53 on the metallic sheet 51 including these projecting and recessed parts 57, 58 in zigzag, by extending these slits 53 in the direction crossing the slits, the plurality of openings 54 are formed and simultaneously frame parts 55 which are continued like the curved surface are formed on the outside edge parts of both ends. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a metal structure in which a plurality of openings are opened by extending a slit formed in a metal plate, and a method for manufacturing the metal structure.

  Some electronic components mounted on the board need to be covered so that they are not directly touched by human hands, and others need a shield cover that is grounded to prevent charging. . In order to efficiently manufacture this cover, shield cover, and the like, for example, a structure using a metal structure called an expanded metal in which a plurality of openings are formed by extending slits formed in a metal plate is known. When expanded metal is used in such applications, the yield of the material is better than when using, for example, a punching board, so that the material can be effectively used and the material cost can be reduced. .

  A manufacturing method of a metal structure called expanded metal is performed by forming a large number of staggered slits in a predetermined area of a metal plate and then expanding (expanding) the slits at right angles. The bond portion and the four strand portions that connect them are configured in, for example, a substantially parallelogram shape (see Patent Document 1, etc.).

Japanese Patent Laid-Open No. 04-238636

However, in this metal structure, when a large number of slits are formed in a staggered pattern on the metal plate, the slits are uniformly formed until the edges of the metal plate are crossed. The opening is not completely closed, and the bond portion connecting the two strand portions is in a half-open state in which a part of the end face of the metal plate remains. For this reason, the end surfaces of the cover and the shield cover become sharp, and there is a possibility that the hand is injured if it is touched carelessly.
In that case, it is conceivable to cover the outer sides of both edge portions of the metal structure with a protective cover separately formed, but it lacks practicality because it causes an increase in manufacturing process and cost.

  The present invention has been made in view of such circumstances, and an object thereof is to provide an excellent metal structure and a method for manufacturing the metal structure without causing a safety problem. .

  In order to achieve the above object, the metal structure of the present invention is a metal structure in which a plurality of openings formed by extending slits formed in a metal plate are provided, and the outer sides of the openings at both outer edges of the metal plate are It is characterized by being formed in a continuous state as a curved frame portion.

According to the above configuration, a plurality of slits formed in the metal plate are stretched by forming the outer edges of the openings at the outer edge portions of the both ends of the metal plate in a curved shape by opening a plurality of openings in which the slits are extended. Even if the opening is opened, the end face of the edge does not become sharp, and a frame portion that is continuous in a curved shape can be obtained. As a result, it is possible to eliminate the need for the end face coating process in the subsequent process, and there is no fear of hurting hands at the outer edges of the both ends of the metal structure, thereby improving safety.
In addition, the outer edge of both ends of the metal plate can be bent to form the bent portion along the side edge, so that the rigidity of the metal structure can be increased at the bent portion and the direction of the outer edge of both ends can be changed. When used as a hand, it can be made difficult to touch the internal parts.

  The metal structure of the present invention may be formed by dividing the opening into a plurality of areas.

  According to the above configuration, the opening is divided into a plurality of areas, and the metal plate portion having no opening is formed between the areas where the opening is formed, thereby further increasing the rigidity of the metal structure in the portion without the opening. While being able to raise, it can be set as the metal structure according to arrangement | positioning and a use of components.

Further, the method for producing a metal structure of the present invention is a method for producing a metal structure having a plurality of openings,
Forming curved irregularities on the outer edges of both ends of the metal plate, which are outside the opening;
Forming a plurality of slits in a zigzag pattern in the metal plate including the irregularities;
Forming the opening by extending the slit in a direction crossing the slit, and forming a curved frame portion in a continuous state at both outer edges in the direction along the slit; and
It is characterized by providing.

According to the above-described configuration, the curved plate-like uneven portions that are the outer sides of the openings are formed on the outer edge portions of the both ends of the metal plate, and after forming the plurality of slits in a staggered manner on the metal plate including these uneven portions, A plurality of openings are formed by stretching in a direction intersecting with the slits, and at the same time, a continuous frame portion is formed on the outer edges of both ends in a continuous state, that is, in a series so as not to be interrupted in the middle. be able to. As a result, it is possible to eliminate the need for a coating process of the end face in a subsequent process, and there is no possibility of damaging the hands at the outer edges of both ends of the metal structure, thereby improving safety. In addition, any of the case where the uneven part is formed on the metal plate first and then the slit is formed, or the uneven part and the slit are formed at the same time may be used. However, in any case, it is necessary that there be no slit that intersects the edge of the metal plate.
Further, by bending the outer edge portions at both ends of the metal plate and forming the bent portions along the side edges, it is possible to increase the rigidity of the metal structure at the bent portions and to change the direction of the outer edge portions at both ends.

  The metal structure manufacturing method of the present invention is characterized in that the metal plate is formed flat after the step of forming a plurality of slits in a staggered manner on the metal plate.

  According to the above configuration, after forming a plurality of slits in a zigzag pattern on the metal plate, the metal plate is formed flat, and then stretched in a direction intersecting with the slit to form an opening. Further, it is possible to eliminate the influence of the return and warpage of the metal plate that occurs when the slit is formed, and it is possible to manufacture a flat metal structure.

  Moreover, the manufacturing method of the metal structure of the present invention may be formed by dividing the opening into a plurality of areas.

  According to the above configuration, the opening is divided into a plurality of areas, and a metal plate part having no opening is formed between the areas in which the opening is formed, thereby further increasing the rigidity in the part having no opening. A body can be manufactured, and a metal structure according to the arrangement and application of components can be manufactured.

  Moreover, the manufacturing method of the metal structure of this invention may make it cancel the constriction after the extending | stretching process of the said slit by making the both-ends outer edge part of a metal plate into the shape bulging outside beforehand.

  According to the above configuration, by making the outer edge portions of the both ends of the metal plate bulge outward in advance, the constriction after the slit stretching process can be offset, and the area where the opening is formed and the area where the opening is not formed The outer shape can be manufactured in the same linear shape, and it is easy to use when used in various applications in the same way as a normal metal plate.

The best mode for carrying out the present invention will be described below with reference to the accompanying drawings.
In the embodiments described below, various limitations are made as preferred specific examples of the present invention. However, the scope of the present invention is not limited to the following description unless otherwise specified. However, the present invention is not limited to these embodiments.
The case where the metal structure and the manufacturing method of the metal structure of the present invention are applied to a cover or a shield cover of an electronic component mounted on a substrate will be exemplified. This metal structure is provided so as to cover the electronic component, thereby providing a cover for preventing direct contact with the hand, or a shield cover for further preventing grounding by grounding.
Here, FIG. 1 is a perspective view of the metal structure in a state where the left and right outer edges are bent, and FIGS. 2 and 3 are manufacturing process diagrams of the metal structure, respectively.

  As shown in FIG. 1, the metal structure 50 with the outer edge portions at both ends bent has an area 52 in the middle portion in the longitudinal direction of a flat metal plate (for example, made of stainless steel, aluminum, etc., having a plate thickness of about 0.5 mm). A plurality of openings 54 are formed on the metal plate, and the openings 54 are formed by extending zigzag slits 53 parallel to the width direction in a direction intersecting with the slits 53 (for example, a longitudinal direction perpendicular thereto), The outer edges 54 of the outer edges of both ends 51 are configured so that the outer sides of the openings 54 are continuous with a curved frame portion 55, and the outer edges of both ends are bent to form bent portions 56 along the side edges.

In order to form the curved frame portions 55 of the openings 54 at the outer edge portions of the metal structure 50, convex portions (portions protruding outward in the width direction) 57 are formed on the outer edge portions of the metal plate 51. In addition, a concave portion (a portion that becomes a concave toward the outer side in the width direction) 58 is formed, that is, the end surface of the metal plate 51 is not formed into a straight shape but is formed into a curved surface (curved shape) so as to fit in the convex portion 57 After the slit 53A1 is formed and the slit 53An formed in the same row as the slit 53A1 is extended, the slit 53A1 located at both ends and the outer edge located outside the slit 53An are curved to form the frame portion 55 continuously. I have to do it. And about the recessed part 58, each slit 53A which belongs to the slit row | line | column of slit 53A1, 53A2, 53A3-53An formed between the above-mentioned right-and-left convex parts 57, and slit 53B1, 53B2 ... in a zigzag form sequentially. The slits 53C1, 52C,... Are sequentially formed in a staggered pattern with respect to the rows of the slits 53B, and the slits 53D1, 52D2,. Any of the slits 53 is formed without intersecting the outer edge portion of the metal plate 51 (specifically, the curved edge of the convex portion 57 or the outer edge of the concave portion 58). Thus, in this embodiment, the row of slits 53B, the row of slits 53C, and the slit 53D are arranged between the row of slits 53A received in the convex portions 57 and the row of slits 53A received in the convex portions 57 in the next step. Are formed so that each slit is in a staggered arrangement. In addition, the space | interval (slit row pitch) between each slit row | line | column is the same about the row | line | column of slit 53A, the row | line | column of slit 53B, the row | line | column of slit 53C, and the row | line | column of slit 53D. The length and thickness of each slit 53 and the interval between adjacent slits 53 are the same, but the slit 53C1 formed between the slit 53B1 and the slit 53D1 facing the outer edge of the recess 58 has a length. It is set shorter than the other slits, and this is a dummy slit that does not open even in the pulling process.
In short, the slit 53 formed in the metal structure 50 according to the present invention is formed without intersecting the outer edge portion of the metal plate 51, so that no breakage occurs at the outer edge portion of the metal plate 51 even after expansion. It is configured. And between the outer edge parts of the metal plate 51, like the conventional expanded metal, the slits of the same length are arranged in a staggered pattern so that the openings are diamond-shaped.

In the metal structure 50, the convex portions 57 and the concave portions 58 are formed on the outer edge portions of the both ends of the metal plate 51. The number of the convex portions 57 is preferably three or more, and when the number of the convex portions 57 is small, The processing force concentrates on the area 52 where the opening 54 is formed and the outer edge portions at both ends of the portion where the metal plate is connected, and breakage easily occurs.
The positions of the slits 53 formed in a staggered pattern of the metal structure 50 from the end edge of the metal plate 51 are preferably the same as or less than the plate thickness. Further, as shown in FIG. 4B, the ratio of the length of the strand portion S of the slit 53 to the length of the bond portion B is preferably 9: 1 or more, and the larger the proportion of the strand portion S, the larger the processing of stretching. Properties (working force, elongation) are improved. The distance between the slits 53 in the slit direction, that is, the pitch of the slits 53 is preferably 1: 2 or less with respect to the thickness of the metal plate 51, and the stretchability (working force, elongation) improves as the pitch ratio decreases. To do.

  According to the experiment, a SECC metal plate having a thickness t of 0.5 mm was used, the strand portion S of the slit 53 was 7.2 mm, and the bond portion B was 0.8 mm (S: B = 9: 1). When the pitch p of the slits 53 is 1 mm (t: p = 0.5: 1), the workability is good, but the pitch p of the slits 53 is 1.5 mm (t: p = 1). 5: 1), the processability is questionable, and when the pitch p of the slits 53 is 2.1 mm (t: p = 2.1: 1), it can be broken and processed. There wasn't.

  According to the metal structure 50 configured as described above, the end surface of the metal plate 51 is not exposed as it is at the outer edge portions of both ends, and the curved frame portion 55 can be formed. For this reason, even if it touches a human hand, it does not get injured and safety can be improved.

  Further, when the metal structure 50 is formed on the outer edge portions at both ends thereof along the side edges with bent portions 56 bent substantially at right angles, the opening 54 formed in the area 52 provides rigidity in the width direction of the metal plate 51. By reducing the cross-sectional area, for example, it is reduced to about 1/5. However, the bending rigidity can be improved by the bent portion 56. Further, the direction of the curved frame portion 55 can be changed by the bent portions 56 at the outer edge portions of the both ends of the metal structure 50. For example, as shown in FIG. Can be difficult to touch directly. Note that the metal structure 50 may remain flat without forming the bent portion 56, as shown in FIG. 4A, depending on the required bending rigidity and application. Further, the bent portion 56 may be formed only on one side of the outer edge portion.

  In addition, the metal structure 50 is not limited to the case where the area 52 where the opening 54 is formed is one, but as shown in FIG. 5, the metal plate portion is left in the middle as shown in FIG. You can also. By doing so, the rigidity of the metal structure 50 can be further increased at the portion of the metal plate 51 having no opening, and the metal structure can be made in accordance with the arrangement and application of the parts to be covered. In the case where the openings 54 are formed by dividing into a plurality of areas 52, it is desirable to form the slits 53 so that the processing resistance during stretching is substantially the same. In this case, it is possible to prevent the openings from being damaged due to stress concentration on a part during stretching, and to form the metal structure 50 in which the openings 54 of the respective areas 52 are opened substantially uniformly.

Next, the manufacturing method of this metal structure will be specifically described with reference to FIGS.
First, a metal plate (blank) 51 as a material for the metal structure 50 is prepared. As shown in FIG. 2A, the metal plate 51 is a rectangular plate having a size corresponding to the application. For example, a plate having a plate thickness of about 0.5 mm is used.

The metal plate 51 is subjected to an outer shape punching process to form curved uneven portions 57 and 58 at outer edges of both ends of the area 52 where the opening 54 of the metal structure 50 is opened (FIGS. 2B and 2C). )reference). In this outer shape punching process, the end surface of the metal plate 51 that becomes the bond portion B of the expanded metal-like opening 54 is formed in advance on the curved convex portion 57, so that the frame portion 55 is continuous in a curved shape in the stretched state. The depths of the concavo-convex portions 57 and 58 are formed corresponding to the staggered arrangement of the slits 53.
Here, the convex portion 57 of the metal plate 51 has a width that allows one slit 53 to be formed, and the concave portion 58 has a width that allows three slits 53 to be formed. The occurrence of damage such as breakage when the opening 54 is stretched is prevented. Note that the widths of the convex portions 57 and the concave portions 58 may be the same as long as the number of the convex portions 57 is increased so as not to cause damage when the slit 53 is stretched. A wide width may be used to prevent concentration of processing force.

Next, the metal plate 51 that has been subjected to the outer shape punching process at the outer edge portions at both ends is subjected to slit processing to form the slits 53 in a staggered manner (see FIGS. 3A and 3B). The slit 53 is a thin through-hole penetrating the metal plate in the plate thickness direction, and a portion corresponding to the width of the expanded metal bond portion B of the opening 54 is opened from the end of the uneven portions 57, 58 to the uneven portion 57, The metal plates 51 are arranged in a row along the width direction of the metal plates 51 orthogonal to the 58.
For example, one slit 53 is formed in the center of the convex portion 57, and three slits 53 are formed in the concave portion 58. The pitch p of the slit 53, the ratio of the strand portion S and the bond portion B, etc. However, as shown in FIG. 3 (b), the center of the slit 53A1 in the longitudinal direction is the position of the base end (root) of the convex portion 57, the position of the valley bottom of the concave portion 58, as shown in FIG. It is desirable to arrange so that it may be located on a straight line.
Note that the outer shape processing for forming the concave and convex portions 57 and 58 and the slit processing for forming the slits 53 at the outer edge portions of the both ends of the metal plate 51 are not limited to two steps, and can be performed simultaneously in one step. .

  For example, as shown in FIG. 6, this slit processing is performed by arranging a metal plate 51 between a horizontally long punch 60 whose tip surface is inclined to one side and a die 61 having a groove whose bottom surface is inclined to one side. . Although the warping and returning due to the punch 60 remain in the metal plate 51 by this slit processing (see FIG. 6B), when the metal structure 50 requires flatness, correction by the roller leveler after the slit processing. It is also possible to perform flat processing.

After the slit processing, the tension processing is performed, and the metal plate 51 is stretched in the longitudinal direction orthogonal to the slit 53 (see FIG. 3B). When the both ends of the area 52 where the slit 53 of the metal plate 51 is formed are pulled, the slit 53 is opened so as to be separated from the central portion, and a rhombus opening 54 is formed, and the manufacture of the flat metal structure 50 is completed. To do. In this metal structure 50, the outer edge portions of both ends of the metal plate 51 do not have a portion that intersects the slit 53, so there is no breakage point, and the previously formed curved uneven portions 57 and 58 are stretched into a curved shape. The continuous frame portion 55 is formed.
In the flat metal structure 50 manufactured in this way, the sharp end surface of the metal plate 51 remains as it is and is not exposed, and it is not injured even if it is touched. Can do.

  Further, the metal structure 50 that has been subjected to the pulling process is bent at the outer edge portions at both ends, and a bent portion 56 is formed. By this bending process, the manufacture of the metal structure including the bent portion 56 is completed.

  The metal structure 50 is not limited to the case where the area 52 in which the opening 54 is formed is made as one place, but the opening 54 is formed in the two areas 52 as shown in FIG. You may make it manufacture the thing of the state which left the metal plate part in the intermediate part of the area 52. FIG. And when manufacturing what divided the several area 52 and formed the opening 54, it is desirable to form the slit 53 at the time of slit processing so that the processing resistance at the time of expansion may become substantially the same. By doing so, it is possible to prevent the stress from being partially concentrated at the time of stretching and damage the opening, and it is possible to manufacture the metal structure 50 in which the openings 54 of the respective areas 52 are opened substantially uniformly. In addition, the rigidity of the metal structure 50 can be increased by the metal plate portion having no opening in the intermediate portion, and the metal structure 50 can be manufactured in accordance with the arrangement of parts to be covered and the intended use.

  In the metal structure manufacturing method described above, the outer edge portions of both ends of the metal plate 51 are stretched by pulling, so that the plate width of the area 52 in which the opening 54 is formed is narrowed. By using the metal plate 51 in which the area 52 where the 54 is formed is swelled to the outside in advance, the constriction due to the stretching at the time of the tensile processing can be offset, and the rectangular metal structure 50 can be manufactured. . In this case as well, it is the same as described above that the frame portion 55 is formed in the outer edge portion of the both ends of the area 52 where the opening 54 of the metal plate 51 is formed so as to have a concave and convex process.

  By the way, the present invention is not limited to the above embodiment, and various modifications can be made based on the description of the scope of claims. For example, the metal plate is not limited to the above-described electrogalvanized steel plate, and a stainless plate or the like can be selected as appropriate.

  The metal structure of the present invention is not limited to use as a cover for electronic parts or a shield cover, but is widely applied to metal structures used as ordinary expanded metal so that sharp end faces are not exposed. And can be widely applied as a manufacturing method thereof.

It is a perspective view of the metal structure which bent both edges. It is process drawing of the first half of the manufacturing method of a metal structure, (a) is a front view of a blank, (b) is a front view of the metal plate after the external shape which formed the uneven part, (c) is an enlarged view of an uneven part. It is a front view. It is process drawing of the latter half of the manufacturing method of a metal structure, (a) is a front view of the metal plate after a slit process and before an extending process, (b) is the elements on larger scale which show arrangement | positioning of the slit of an uneven | corrugated | grooved part, (c ) Is a front view of the metal plate after pulling. (A) is a front view of the metal structure which has been stretched, and (b) is an enlarged view of the opening. It is a front view of the metal structure which provided two stretching areas. (A) is explanatory drawing of slit processing, (b) is explanatory drawing of the metal plate after a process.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 50 ... Metal structure, 51 ... Metal plate, 52 ... Area, 53 ... Slit, 54 ... Opening, 55 ... Frame part, 56 ... Bending part, 57 ... Convex part, 58 ... Concave part, 60 ... Punch, 61 ... Die, S ... Strand part, B ... Bond part

Claims (8)

A metal structure having a plurality of openings formed by extending slits formed in a metal plate,
A metal structure characterized in that the metal plate is formed in a state in which the outer sides of the openings at both outer edge portions of the metal plate are continuous as curved frame portions.   2. The metal structure according to claim 1, wherein the outer edge portions of both ends of the metal plate are bent, and the bent portions are formed along the side edges.   The metal structure according to claim 1 or 2, wherein the opening is divided into a plurality of areas. A method of manufacturing a metal structure having a plurality of openings,
Forming curved irregularities on the outer edges of both ends of the metal plate, which are outside the opening;
Forming a plurality of slits in a zigzag pattern in the metal plate including the irregularities;
Forming the opening by extending the slit in a direction crossing the slit, and forming a curved frame portion in a continuous state at both outer edges in the direction along the slit; and
A method for producing a metal structure, comprising:   The method of manufacturing a metal structure according to claim 4, further comprising a step of forming the bent portion along the side edge by bending the outer edge portions of both ends of the metal plate.   6. The step of forming a plurality of slits in a staggered pattern on the metal plate is formed by flatly forming the metal plate and then extending in a direction intersecting with the slits to form openings. Manufacturing method of metal structure.   The method for manufacturing a metal structure according to claim 6, wherein the opening is divided into a plurality of areas of the metal plate.   The method for manufacturing a metal structure according to any one of claims 4 to 7, wherein the outer edge portions of both ends of the metal plate are swelled outward in advance to cancel the constriction after the slit is stretched.

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