JPH039813B2 - - Google Patents

Description

[Detailed Description of the Invention] [Object of the Invention] (Industrial Application Field) This invention provides a method for manufacturing a case from a metal plate.
The present invention relates to a method for manufacturing a case in which the end faces can be easily joined to each other, the cost of these manufacturing steps can be reduced, and the molded case can also have an excellent appearance.

(Prior art) In the case of a conventional case formed using a metal plate, a metal plate in the shape of an expanded case to be formed is appropriately bent, and the end faces of the metal plate are joined together. . The end faces are usually joined together by welding, or the end faces are appropriately overlapped and crimped.

(Problems to be Solved by the Invention) <Problems with the Prior Art> However, in the manufacturing process of this case, when the above-mentioned welding is used to join the end faces, it is very time-consuming. For example, even if they are joined by spot welding, the end faces must overlap each other, or the edges must be brought into close contact with each other before welding, which leads to increased costs and is somewhat dissatisfied with the appearance. It was something that remained.

On the other hand, in the case of joining by caulking, there is a problem in that the thickness of the overlapping portion increases, which makes the appearance unsightly, and there is also concern about the strength.

<Technical Problems> Therefore, in view of the above-mentioned problems, the present invention solves the following problems:
When manufacturing a case from a metal plate, it is an object to easily join the end faces to each other, to reduce the cost of these manufacturing processes, and to provide a molded case that has an outstanding appearance. It was created as a.

[Structure of the Invention] (Means for Solving the Problems) This invention provides a method in which one edge of a metal plate having a developed shape of a housing to be formed is formed into an uneven shape, and the plate thickness of the uneven convex portion is set as above. A punching and rolling process in which a metal plate is punched and rolled to be thinner than the thickness of the metal plate, and a protrusion is formed on the rolled surface at the same time as this rolling, and the other end of the metal plate is pressed in the thickness direction of the metal plate. In order to engage the convex part, an engagement recess having a depth corresponding to the plate thickness of the convex part is formed, and the protrusion is passed through at a position corresponding to the protrusion when engaged, and the opposite side is formed. A crushing and opening process in which an engagement hole is made to slightly protrude from the metal plate, an edge cutting process in which the portion protruded by the punching and rolling process and the crushing and opening process are press cut into a predetermined shape, and a metal plate formed in this way. A bending process in which the protrusion and the engagement recess are engaged by appropriately bending it into a box shape, and when the protrusion and the engagement recess are engaged, the engagement hole is formed. It consists of a caulking process in which the protrusion that penetrates through and slightly projects on the opposite side of the engagement recess is crushed to join the protrusion and the engagement recess, and by performing these processes in a series, the above-mentioned problems can be solved. This solves the problem.

(Function) In the method for manufacturing a case according to the present invention, first, one edge of a metal plate in the shape of a developed case to be formed is made into an uneven shape by a punching and rolling process, and the plate thickness of the uneven convex part is The metal plate is die-rolled to be thinner than the thickness of the metal plate, and at the same time as this rolling, protrusions are formed on the rolled surface. At almost the same time, in a crushing and opening step, the other end of the metal plate is pressed in the thickness direction of the metal plate to engage the protrusion in an engagement recess having a depth equal to the thickness of the protrusion. At the same time, an engagement hole is bored at a position corresponding to the protrusion when engaged, through which the protrusion penetrates and slightly protrudes from the opposite side.

Next, in the edge cutting process, the portion that has been cut out in the punching and rolling process and the crushing and opening process is press-cut into a predetermined shape.

Then, in a crimping step, the metal plate formed in this way is appropriately bent to engage the convex portion formed into a box shape with the engaging recess, and the convex portion and the engaging concave portion are engaged with each other. When the protrusion and the engagement recess are engaged, the protrusion that passes through the engagement hole and protrudes slightly on the opposite side of the engagement recess is crushed to join the protrusion and the engagement recess, and these are combined in a series of steps. This is what we do.

(Embodiment) An embodiment of the present invention will be described below with reference to the drawings.

That is, the reference numeral 1 shown in FIG. 1 is a raw metal plate that is formed in series by the progressive press process, and first, the reference numerals A and B in FIG.
As shown in FIG. In order to make the plate thickness of the convex portion 4 thinner than the plate thickness of the metal plate 2, die-cut rolling is performed. At the same time as this rolling, projections 5 are formed on the rolled surface, and this process is referred to as a punching and rolling process.

Simultaneously with this punching and rolling process, the other end portion 6 of the metal plate 2 is punched and formed, and the protrusions 4 are pressed in the thickness direction of the metal plate 2 to engage the protrusions 4. Engagement recesses 7 having a depth equal to the thickness of the plate are formed in two places corresponding to the protrusions 4, and the protrusions 5 are penetrated at positions corresponding to the protrusions 5 when engaged. Engagement holes 8 that are slightly protruded from the opposite side are opened respectively, and this process is referred to as a crushing/opening process.

Next, as shown in parts C and D in FIG. 1, while the outline of the metal plate 2 is gradually punched and formed, the portions that protrude through the punching and rolling process and the crushing and opening process. 9 is punched out and press cut, and edges are cut by an edge cutting process so that the protrusions 4 and the engagement recesses 7 can engage with each other. In this case, since these steps are carried out sequentially, a part of the metal plate 2 is kept connected to the raw metal plate 1 so as not to be separated.

The metal plate 2 formed in this way is bent into a rectangular cylinder to form a rectangular cylindrical housing 11 as shown in parts E and F in FIG. 1 through a bending process. The protrusion 4 and the engagement recess 7 are brought into engagement by bending and forming the protrusion 4 as appropriate.

1, when the protrusion 4 and the engagement recess 7 are engaged in the crimping process, the engagement hole 8 is penetrated and the engagement recess 7 is engaged. The convex portion 4 and the engagement recess 7 are joined by crushing the protrusion 5 that slightly protrudes from the opposite side.

Finally, as indicated by the reference numeral H in FIG. This is done through a series of steps called shipping.

As shown in FIG. 2, the case 11 formed in this manner has an engagement recess 7 having the same depth as the thickness of the convex part 4 at the joint part, so that when these are engaged, The thickness is the same as that of metal plate 2,
There is no change in thickness even after bonding. Moreover, even when crimping is performed, only the slightly protruding protrusion 5 is crushed, so although only the crushed part swells slightly, its thickness is minute and there is almost no change in the thickness of the metal plate 2. .

The joint strength is ensured only by the caulking process, which is the direct work of joining, but in reality,
Since the protrusions 4 and the engagement recesses 7 prevent lateral displacement, this also increases the bonding strength. Also, in terms of tensile strength, the protrusion 5 that penetrates the engagement hole 8 and slightly protrudes from the opposite side of the engagement recess 7
Since they are crushed and joined together, they are very large, which increases the strength of the housing 11 itself, and it also has a very good appearance.

Incidentally, the reference numeral 10 in the figure is a reference hole for performing progressive feeding. Furthermore, the method for producing a box body according to the present invention includes:
It goes without saying that the present invention is not limited to the embodiments described above.

[Effects of the Invention] In the present invention configured as described above, one edge of the metal plate 2 having the expanded shape of the housing 11 to be molded is made uneven, and the plate thickness of the uneven convex portion 4 is set to be equal to the thickness of the metal plate 2. A punching-rolling process is performed to make the metal plate thinner than the plate thickness of the metal plate 2, and at the same time as this rolling, a protrusion 5 is formed on the rolled surface, and the other end of the metal plate 2 is processed in the thickness direction of the metal plate 2. In order to press and engage the protrusion 4, an engagement recess 7 having a depth corresponding to the plate thickness of the protrusion 4 is formed, and this protrusion is placed at a position corresponding to the protrusion 5 when engaged. a crushing/opening process in which an engaging hole 8 is drilled through the hole 5 and slightly protrudes from the opposite side; and an edge cutting process in which the portion 9 that is protruded by the punching/rolling process and the crushing/opening process is press-cut into a predetermined shape. and a bending step of suitably bending the thus formed metal plate 2 to form it into a box shape and engaging the protrusion 4 and the engagement recess 7, and 7 is engaged, the protrusion 5 that passes through the engagement hole 8 and projects slightly on the opposite side of the engagement recess 7 is crushed to join the protrusion 4 and the engagement recess 7 together. By performing these steps as a series of steps, these steps can be press-formed, so progressive processing is possible, and manufacturing costs can be reduced.

Moreover, since the joint part has an engagement recess 7 with the same depth as the thickness of the convex part 4, when these are engaged, the thickness becomes the same as the thickness of the metal plate 2, and even when joined, the thickness is the same as that of the metal plate 2. There is no change at all. Even when tightening, only the slightly protruding protrusion 5 is crushed, so only the crushed part swells slightly, but
Its thickness is minute, and there is almost no change in the thickness of the metal plate 2.

Furthermore, the joint strength is ensured only by the caulking process, which is a direct work of joining, but in reality, the protrusion 4 and the engagement recess 7 suppress lateral deviation, so this point is This also increases the bonding strength.

Also, in terms of tensile strength, the projection 5 that passes through the engagement hole 8 and projects slightly on the opposite side of the engagement recess 7 is crushed and joined, so it is very large and the strength of the housing 11 itself is increased. This not only leads to better results, but also provides an extremely superior appearance.

As explained above, according to this explanation, when manufacturing a case from a metal plate, the end faces can be easily joined together, and the cost of these manufacturing processes can be reduced, and the molded case can be easily joined. It also has various excellent effects, such as making it look even better.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing the process of molding by the progressive step of the manufacturing method according to the present invention, and FIG. 2 is an enlarged sectional view of the molded case. 1... Material metal plate, 2... Metal plate, 3... Portion that can become one edge, 4... Convex portion, 5... Protrusion,
6... Location that can become the other end, 7... Engagement recess,
8...Engagement hole, 9...Protruded portion, 11...Front body.

Claims (1)

[Claims] 1 One edge of a metal plate in the shape of a developed box to be formed is shaped into an uneven shape, and the metal plate is rolled to form a die so that the thickness of the uneven convex portion is thinner than the thickness of the metal plate, and this rolling At the same time, a punching and rolling step is performed to form protrusions on the rolled surface, and the other end of the metal plate is pressed in the thickness direction of the metal plate to a depth equal to the thickness of the protrusion in order to engage the protrusion. a crushing/opening step of forming an engagement recess having a shape, and drilling an engagement hole through which the protrusion passes through the protrusion at a position corresponding to the protrusion when engaged and slightly protrudes to the opposite side; and a punching process. An edge-cutting step of press-cutting the portion protruded by the rolling process and the crushing/opening process into a predetermined shape; and the metal plate formed in this way is appropriately bent to form a box shape, and the metal plate is engaged with the convex portion. In the bending step of engaging the concave portion, and when the convex portion and the engaging concave portion are engaged, the protrusion that penetrates the engaging hole and slightly protrudes to the opposite side of the engaging concave portion is crushed. 1. A method of manufacturing a case, comprising a crimping step of joining a convex portion and an engaging recess, and is characterized in that this is performed in a series of steps.