JP2567064Y2 - Shape structure of cover for electronic device - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sheet metal structure which is easy to bend and has case strength when a sheet material is bent into a box shape to obtain a case structure. More specifically, the present invention relates to a box-shaped structure in which a processing cost is lower than that of a conventional case structure by a case structure in which a bending stress (tension) of a plate material is always applied.

[0002]

2. Description of the Related Art An example of a processing step of the conventional box-shaped case structure shown in FIG. In mass production applications to reduce the weight and thickness of the case, the strength can be easily improved by pressing a curved surface such as stepping or dents with a press die, etc. In the case of use in production, the use of a mold is not used in terms of cost, and an existing general-purpose mold or NC press is used to improve strength.

[0003] For example, a description will be given of a forming process of the case 33 by a roller bender which is relatively easy to process a curved surface. First, in the first step, the entire flat plate 31 is curved into a mountain shape by a roller bender to form a predetermined curved surface 34. In the next step, the case 33 is formed by bending the square of the angled plate 32 with a bender. For this reason, when bending a square with a press, it is necessary to prevent the previously curved surface-shaped state from being broken, and for this purpose, it is necessary to use a press die corresponding to the curved surface radius 34 as the press die of the bender. Further, since the plate material is in a curved state, in actual work, there is a problem that the positioning of the square bend 36 is not stable, and there is a problem that the bending dimension position is easily deviated. Next, in the last step, the end faces are joined 38 by spot welding, caulking, rivets, or the like to complete the process.

In general, it is difficult to maintain the accuracy of the curved surface radius 34 by a roller bender. For example, the flat plate 3 to be used
This is because the radius of the curved surface easily changes depending on the thickness and material (iron plate, aluminum plate, treated steel plate) of 1, and the strength of the pressing pressure of the roller applied during bending. For this reason, the press pressure is finely adjusted, or the bender process is performed a plurality of times to ensure the accuracy of a predetermined curved surface processing dimension. As a result, the number of processing steps is increased, the efficiency is low, the processing is difficult, and the processing cost is high.

[0005]

[Problems to be Solved by the Invention] As described above, in the case of use in medium- and small-volume production, in terms of cost, the existing general-purpose type is used to improve the strength and reduce the thickness of the sheet by curved surface processing. I have. However, since the positioning of the square bend is not stable, it is not always satisfactory in terms of the processing accuracy and the processing cost.

Accordingly, the problem to be solved by the present invention is to eliminate the need for curved surface processing, to easily maintain dimensional accuracy, to reduce processing costs easily, to have high strength, and to provide a case having a curved surface shape. The purpose is to provide the structure.

[0007]

[Means for Solving the Problems] (Solution Means of FIG. 1) In order to solve the above problems, in the configuration of the present invention, the bending angle of the square bending 14 is bent less than a predetermined angle. Then, joining 19 is performed while applying a pulling force 16 to both end surfaces 11.
Thus, the electronic device cover has a structure in which the tension 20 is held all around the case.

(Solution Means of FIG. 2) In addition, the bending angle of the square bending 25 is bent more than a predetermined angle as a structure in which the tension is applied all around the case. The electronic device cover has a structure in which the joining 22 is performed while applying a force 24 for expanding the both end surfaces to hold the tension 23 around the entire periphery of the case.

[0009]

The joints 19 and 22 are made while applying a pulling force 16 and a pushing force 24 to both end surfaces. As a result, the completed cases 13 and 21 have bending stresses of 20 and 2
3 is applied to the entire circumference, and the tension acts to form a curved shape on the entire circumference. In addition, by applying tension to the entire case, there is a function of giving high strength and a function of reducing generation of dents and chattering noise.

[0010]

Embodiment (Embodiment 1) An outline of the embodiment will be described. In this embodiment, the curved surface processing is eliminated. Then, the angle of the square bend 14 is made smaller than the bend angle of the original case. Thereafter, the end faces 11 are joined together by applying a pulling force 16. As a result, the plate material always has a tension of 20 due to bending stress.
Is added, thereby forming and realizing a curved surface.
Moreover, at the same time, a high-strength case structure is realized.
This will be specifically described with reference to an example of the processing steps of the present invention in FIG.

In the first step, the plate 12 is formed by bending a square of the flat plate 31 by a bender. Here, the bending angle of the square bending 14 is not set to 90 degrees but is set to, for example, 80 degrees. By the way, regarding the workability, since the plate material is a flat plate, the bending dimensional position accuracy can be easily obtained. Further, as the press die, a general press die for bender can be used.

Then, in the next step, the plate material 12 in a state where a gap 15 is formed due to bending at 80 degrees is brought into a state in which both end faces are joined together while applying a force 16 in a pulling direction.
The case is completed by joining 19 with spot welding, caulking, rivets and the like. As a result, the completed case 1
A tension 20 due to bending stress is applied to the entire circumference of 3, and this tension 20 forms a curved surface as a whole. In addition, a high-strength structure can be secured by this tension, and the occurrence of dents and chattering of the case can be reduced.

(Embodiment 2) In the above description, the bending angle is limited to 80 degrees. However, in Embodiment 2 of the working structure of the present invention in FIG. For example, it is bent to 100 degrees. Then, when joining the both end surfaces, the joining 22 is performed while applying a force 24 in a direction to push and spread the opposite end surfaces. As a result, similarly to the first embodiment, a tension 23 is applied to the completed case 21 over the entire circumference, and a curved surface shape is formed as a whole by this tension, so that high strength can be similarly secured.

[0014]

[Effect of the Invention] The present invention is configured as described above, and has the following effects. The curved surfaces 20 and 2 are joined by applying a bending stress.
3 is formed. For this reason, the pre-processing step for the curved surface processing work becomes unnecessary, and the processing cost can be reduced.
It is easy to maintain dimensional accuracy. In addition, the effect of being able to form a high-strength case structure can be obtained by constantly applying tension.
Further, this tension provides an advantage that acoustic resonance (chattering) can be further reduced as compared with the conventional case.

[0015]

[Brief description of the drawings]

FIG. 1 is an example of a processing step of the present invention.

FIG. 2 is a second embodiment of the processing structure of the present invention.

FIG. 3 is an example of a processing step of a conventional box-shaped case structure.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 11 End surface 12 Plate material 13, 21 Case 14, 25 Square bending 16 Pulling force 19, 22 Joining 20, 23 Tension 24 Pushing force

Claims (2)

(57) [Scope of request for utility model registration] 1. A box-shaped cover shape structure, wherein a square bending (14) is bent at a bending angle smaller than a predetermined angle, and both ends (11) are joined (19) while applying a pulling force (16) to the case. A shape and structure of a cover for an electronic device, comprising: a tension (20) held around the entire circumference; 2. A box-shaped cover-shaped structure, wherein a bending angle of a square bending (25) is bent more than a predetermined angle, and a joining (2) is performed while applying a force (24) for pushing and expanding both end faces.
2) The electronic device cover according to claim 1, wherein tension is maintained around the entire case.