JPH0899132A - How to open a hole in a metal plate - Google Patents

Abstract

(57) [Summary] [Purpose] When an air purifier is attached to a car at any time, a hole for the air intake must be made in the car body. A manufacturer makes a hole at a predetermined position on the vehicle body and a cover is adhered to the vehicle body, or long holes are sprinkled in sequence at the planned hole edge. Peel off the cover or cut a long hole to open a hole. The purpose is to make it easier. [Structure] The uncut portions 3, 3'are cut along the entire circumference of the planned hole edge.
Cut out leaving. When necessary, left uncut part 3 on one side,
The hole plate A'is repeatedly rocked by separating (4) 3 and raising and lowering one side thereof. As a result, the uncut portions 3'and 3'on the swing shaft 5 are fatigue fractured and the hole A is opened.
Although 1 and 2 are fine groove punched holes, shearing may be used instead. Cut holes at both ends and shear. In some cases, the hole plate A'is simply folded back.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for opening a hole in a metal plate.
The purpose is to make it easy to make holes in the car body.

[0002]

2. Description of the Related Art In the case of an air purifier for an automobile, one of the methods for easily forming a hole at a predetermined position of a vehicle body is to open a rectangular hole of a required size at the time of manufacturing the vehicle body, and then adhere a cover plate to cover it. When necessary, the method of peeling off the cover plate is the second method, in which long holes are sprinkled along the planned hole edge and the long holes are cut off with a tool when necessary. FIG. 12 shows the current method of the second method, in which 9 elongated holes B are punched along the planned hole A edge, and a hole A is opened by cutting them between them as shown by the chain double-dashed line in the figure. ing.

[0003]

Problem 1 to be Solved by the Invention
Has to make extra parts such as a cover plate that closes the rectangular hole, and the work of adhering this is added. The second problem is that a large number of long hole machining is a burden on the automobile assembly line, and cutting each long hole with a tool at the time of attaching the air purifier is also a difficult task. However, in order to be able to open the required holes in the metal plate at any time, no method other than the above-mentioned No. 1 and No. 2 could be considered. The inventor has captured a better alternative method for the purpose of this invention.

[0004]

According to the method for opening a hole in a metal plate of the present invention, a part of a planned hole edge of the metal plate is cut out in advance, and when necessary, the remaining hole edge is cut out to form a complete hole. In the opening method, the planned hole edge with one straight line part is cut out around the entire circumference except for the cutout part of each of the one straight line part and the other part, and the uncut part of the other part is cut off when necessary. Then, the plate surrounded by the predetermined hole edge is repeatedly oscillated with the single linear portion as the oscillating shaft, so that the uncut portion of the linear portion is fatigue fractured.

The means for cutting out the entire circumference except for the uncut portion is punching of fine grooves by a press or shearing. In the case of shearing, it is shearing between round holes opened at both ends.

Further, the area surrounded by the planned hole edge having two straight line portions is divided into two by a dividing line so that both are surrounded by one straight line portion, the planned hole edge and the dividing line. For both sets, cut out the entire circumference except for the uncut portion of each of the straight line portion and the other portion, and cut off the uncut portion of the other portion when necessary, and both plates surrounded by the planned hole edge and the dividing line Is repeatedly oscillated around each of the linear portions as an oscillating shaft, so that the uncut portion of each linear portion is fatigue fractured.

Incidentally, part or all of the uncut portion may be a marking line in which the blade edge is stopped in the middle of the plate thickness. Alternatively, a small hole may be preliminarily formed in the center of the uncut portion other than the straight portion, and the uncut portion may be cut off by punching the small hole with a tip of a drill when necessary. In all of the above-described hole opening methods, the plate surrounded by the planned hole edges is broken, but instead of repeatedly swinging until the break, the hole is opened by simply folding it back.

According to the invention, most of the planned hole edge of the metal plate is cut out, leaving at least the uncut portion in the straight line portion, and if necessary, the plate in the region surrounded by the planned hole edge. Is bent to the back side of the metal plate with the straight line portion as a rotation axis.

[0009]

The present invention is the prior art, that is, whether the cover plate, which has the necessary holes previously formed and adhered thereto, is peeled off, or whether the long holes are connected in the shape of the hole edges and the spaces between the holes are cut. In two ways,
What is called the breaking method and the folding method is newly added. The breaking method is to cut out completely except for the uncut portion of the straight part of the planned hole edge and other parts. If necessary, by cutting off only the uncut portion of the other part and repeatedly swinging the hole plate inside the hole edge around the straight part as an axis, the uncut part of the straight part is easily fatigue fractured and the hole Be established. In addition, here, even after one or two swings, the uncut portion on the swing shaft becomes work-hardened (brittle) and breaks, which is called fatigue fracture.

The means for cutting the planned hole edge leaving a slight uncut portion is punching with a fine groove by a press, that is, punching with a thin plate punch or shearing with a shearing blade. Since both punching and shearing are performed by sandwiching the metal plate between the upper and lower blades, it is easy to make the uncut portion. When the upper shear blade is pressed against the inside of the planned hole edge and pushed down, no distortion due to shear remains on the completed hole edge. Although the present invention can be referred to as a breaking method as described above, the hole plate to be broken is not limited to one in a predetermined hole and may be divided into two. Two pieces are easier to swing and break. The uncut portion of the present invention may be a marking line in which the cutting edge is left in the middle of the plate thickness and left uncut. This has a notch effect that accelerates fatigue rupture. It is easier than using a cutter or scissors to open a small hole in the center of the uncut part and enlarge the hole with a drill when necessary to separate it. The difference between the folding method and the folding method is that the folding is literally changed to folding.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is the simplest embodiment of opening a hole for an air purifier of an automobile. The paper surface of the figure is the metal plate surface, the planned hole is A, and the hole plate to be broken is A '. Two long sides of the hole A are narrow groove punched holes 1 and 1, and two short sides are thin groove punched holes 2 and 2 having uncut portions 3 and 3 '. FIG. 1 shows a state in which a left uncut portion 3 and a left uncut portion 3 are cut to form a cut-off portion 4. With this, the hole plate A ′ to be broken in the hole A can be repeatedly swung about the swing shaft 5 on the right short side. That is, when the hole plate A ′ is vertically swung by hooking the fingertip on the left side small groove punching hole 2, the right uncut portion 3 ′ through which the swing shaft 5 passes is fatigue fractured.

The embodiment shown in FIG. 2 is an example in which a planned hole is divided into two parts by a dividing line 7 and divided into two hole plates A'and A'and folded. The difference from FIG. 1 is that a punching hole 1'connecting the narrow groove punching holes 1 and 1 on both long sides along the central dividing line 7 is added. The left and right hole plates A'can be folded into individual pieces. In this embodiment, the hole plate A'can be broken without cutting the uncut portion in advance. In the embodiment of FIG. 3, the uncut portion 3 is formed in the fine groove punching hole 1 ′ along the dividing line 7 in the center of FIG.
Is provided to prevent the hole plate A ′ from being bent due to an unexpected external pressure. In this case, the uncut portion 3 of the punched hole 1'in the center is cut off, and then the hole plates A'and A'are broken off.

The embodiment of FIGS. 4-6 relies on shearing rather than punching the cutting means. In FIG. 4, the fine groove punched holes 1 and 2 of the embodiment of FIG. 1 are replaced with shear cuts 11 and 12 and round holes 10 at both ends thereof. The circular hole 10 is not only necessary for shearing, but also makes the uncut portions 3, 3 ′ have a required size, and facilitates the use of scissors and a cutter when the uncut portion 3 is cut off at the time of opening.

FIG. 5 is a diagram in which FIG. 2 is changed to a shearing system, and FIG.
3 is a modification of FIG. 3 to the shearing method. As in FIG. 4, the parallel line 9 along the shear cut 11 is a fold that indicates a bend from it. Although it is not necessary to make a strong crease, it may be left as it is after being sheared, but it is better to make a crease at a certain angle. In the case of FIG. 4, the left uncut parts 3 and 3 are separated into the cut parts 4 and 4.
And the plate A'is repeatedly rocked around the rocking shaft 5. In the case of FIG. 5, the hole plates A ′ and A ′ are respectively attached to the swing shaft 5,
Repeatedly rock 5 and break off. In the case of FIG. 6, after making the cut-off portions 4 and 4 in the uncut portions 3 and 3 at both ends of the shear cut 11 ′ along the central dividing line 7, the perforated plates A ′ and A ′ are broken as in FIG. .

According to the present invention, the peripheral edge of the planned hole is left in place so as not to cut off the inner hole plate, and is left almost cut out.
It is not limited to the shape of the uncut portion 3, 3 '. It suffices that the uncut portion on the swing shaft is fatigue fractured by repeated swinging of the hole plate. 7 to 10 show an embodiment in which the marking line uncut portion 8 is used. FIG. 8 shows a cross section of a portion of the metal plate P where a cutting edge (not shown) is press-fitted to the middle of the plate thickness and the marking line uncut portion 8 is press-formed.

Even if the unmarked line portion 8 is long, fatigue breakage easily occurs due to refraction, so that the length can be freely selected. Figure 7
In the embodiment of the present invention, of the four sides of the planned hole, two shorter sides are cut at their full length by the fine groove punching holes 1 and 1, and at the same time, the central dividing line 7 is connected by the fine groove punching holes 1'and long. The two sides connect the marking line uncut portion 8 and the normal uncut portion 3 '.
When the hole plate A ′ is repeatedly rocked by placing a fingertip on the narrow groove punching hole 1 ′ at the time of opening a hole, the marking line uncut portion 8 serving as the rocking axis is fatigue fractured together with the normal uncut portion 3 ′.

FIG. 9 shows an ordinary uncut portion 3 provided in the middle of the narrow groove punching hole 1'of FIG. 7 to enhance resistance to an undesired external force. Opens the required holes in the same manner as in FIG. FIG. 10 shows a shear cut 11 and a round hole 1.
Cut out both long sides of the hole with 0, and also shear cut 12
With the round hole 10, the hole is divided into two along the dividing line 7 and divided into hole plates A ′ and A ′. The short sides on both sides connect the marking line uncut portion 8 of almost the entire length and the normal uncut portions 3 ′ on both ends thereof.

At the time of opening a hole, if the cut-off portions 4 are formed in the ordinary uncut portions 3 and 3 at both ends of the shear cut 12 in FIG. 10, both hole plates A'and A'are attached to the swing shafts 5 and 5, respectively. On the other hand, it can be repeatedly rocked and broken. The cutting part 4 is generally made with a cutter or metal cutting scissors, but as shown in FIG. 11, a small hole 6 is opened in the uncut part 3 with a drill or punch, and when cutting, a slightly larger drill is used for the small hole 6. You may take the method of applying and perforating like a chain line. 13,
14 shows two examples in which the hole plate A ′ is not broken, but is bent from the swing shaft 5 to the back side of the metal plate. Although it may be left folded as shown in FIG. 13, it is more preferable to use a plastic clip P as shown in FIG. Although a few examples have been described above, it goes without saying that the present invention can be variously changed and applied without changing the gist thereof.

[0019]

According to the present invention, the holes to be opened at any time are completely cut out except for the necessary uncut portion in order not to cut off the inner hole plate. Then, when opening a hole, a slight uncut portion is cut off, or without cutting work, the remaining uncut portion is fatigue fractured only by repeated rocking of the hole plate, or it is folded back and the new hole opening method is completed. Opened.

If there are one or two uncut portions to be cut off at the time of opening a hole, and a large number of uncut portions to be fatigue fractured on the swing shaft, the hole plate supporting force before opening the hole will be sufficient, and the hole plate supporting force before opening will be sufficient. The separation work is easy. Even if it is thin, it is not easy to separate the metal plate, so compared with the conventional method of opening many holes by connecting many long and narrow holes, one place is separated and the hole plate is repeatedly rocked or folded to the back side. This invention, which is just a plug-in, is epoch-making.

Further, according to the present invention, in the past, as a pre-processing for opening a hole, it was necessary to connect a large number of long holes, but
Fine groove punching by a press and shearing were presented to facilitate the cutting process. He also suggested that the hole plate cut or folded from the hole should be divided into two parts to facilitate the opening work. It was also shown that the uncut portion could be not only the mutual gap between the punched hole and the sheared portion, but also the uncut portion in the plate thickness direction, that is, the shape of the marking line, but this has a notch effect, and it is beautifully brittle. Breaks and leaves no strain in the break. Furthermore, as a method of separating the uncut portion, a method using a drill was presented in addition to a cutter and metal cutting scissors.

[Brief description of drawings]

FIG. 1 is a plan view of an embodiment of the present invention (by punching).

FIG. 2 is a plan view of another embodiment (by punching).

FIG. 3 is a plan view of a similar embodiment (by punching).

FIG. 4 is a plan view of another embodiment (by shearing).

FIG. 5 is a plan view of another embodiment (by shearing).

FIG. 6 is a plan view of likewise embodiment (due to shearing).

FIG. 7 is a plan view of another embodiment (with a marking line uncut portion).

FIG. 8 is a cross-sectional explanatory view of the uncut portion of the marking line.

FIG. 9 is a plan view of another embodiment (with an uncut portion left after engraving).

FIG. 10 is a plan view of another embodiment (with an uncut portion left after engraving).

[Fig. 11] Still another embodiment (separation by a drill)
Plan view of.

FIG. 12 is an explanatory view of a conventional technique.

FIG. 13 is a sectional view of a hole plate folding portion.

FIG. 14 is a sectional view of another embodiment of the hole plate folding portion.

[Explanation of symbols]

 1 Fine groove punched hole 2 Same as above 3 Uncut part 4 Separated part 5 Swing shaft 6 Small hole 7 Dividing line 8 Marked line Uncut part 11 Shear cut 12 Same as above

Claims (7)

[Claims] 1. A method in which a part of a planned hole edge of a metal plate is cut out in advance and, when necessary, the remaining hole edge is cut out to form a complete hole. , The entire straight line except the uncut portion of each of the straight line portion and the other portion is cut out, and the uncut portion of the other portion is cut off when necessary, and the plate surrounded by the planned hole edge is A method for opening a hole in a metal plate, characterized in that the uncut portion of the straight line portion is fatigue-ruptured by repeatedly swinging the straight line portion as a swing axis. 2. The hole opening method according to claim 1,
A method for punching a hole in a metal plate, characterized in that the means for cutting out the entire circumference except the uncut portion is punching of a narrow groove by a press. 3. The hole opening method according to claim 1,
A method for opening a hole in a metal plate, characterized in that the means for cutting out the entire circumference except the uncut portion is shearing between circular holes opened at both ends. 4. A method for forming a complete hole by cutting out a part of a planned hole edge of a metal plate in advance, and cutting out the remaining hole edge when necessary to form a complete hole. The area enclosed by is divided into two by a dividing line so that both are surrounded by one straight line portion, the planned hole edge and the above dividing line. The entire circumference of the plate is cut out, the uncut portion of the other part is cut off when necessary, and both plates surrounded by the planned hole edge and the dividing line are repeatedly rocked with each linear part as the rocking axis. A method for opening a hole in a metal plate, characterized in that the uncut portion of each straight line portion is fatigue fractured by doing so. 5. The hole opening of a metal plate according to claim 1 or 4, wherein a part or all of the uncut portion is a marking line that stops the cutting edge in the middle of the plate thickness. Method. 6. The opening method according to claim 1 or 4, wherein a small hole is made in advance in the center of the uncut portion of the portion other than the straight portion, and the tip of the drill is applied to the small hole when necessary to make a hole. By doing so, the method for opening a hole in a metal plate is characterized in that the uncut portion is cut off. 7. The planned hole edge of the metal plate is largely cut out, leaving at least a cut-out portion in its straight line portion, and if necessary, a plate in an area surrounded by the planned hole edge is formed. ,
A method for opening a hole in a metal plate, which is characterized in that the straight line portion is folded to the back side of the metal plate as a rotation axis.