JP4179722B2 - Sheet metal processing method - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a sheet metal working method for bending corrugated metal flat plates.
[0002]
[Prior art]
2. Description of the Related Art Conventionally, as a method of sheet metal processing of a member that requires bending processing of a continuous waveform shape, there is a method of cutting a flat plate into a required shape by laser processing and then bending the waveform by press molding.
[0003]
For example, in order to ensure braking performance and steerability on icy and snowy roads and to improve uneven wear resistance on general roads, vehicle tires are provided with a plurality of cuts in the tire tread. Is formed by a blade that is a metal piece implanted in a tire vulcanization mold.
[0004]
In order to manufacture this blade, conventionally, a plurality of plate materials having a required shape are cut from a flat plate, and each plate material is bent by press molding.
However, if an attempt is made to obtain the final shape in one step in the pressing process, cracks occur, so that the final shape is obtained by performing multiple presses.
[0005]
That is, as shown in FIG. 7, the cut plate material 01 is first press-molded with the dies 02 and 02 (see FIG. 7 (1)), subjected to bending at three locations, and then the dies 03 and 03 are further added. Press molding (see Fig. 7 (2)), add 4 bending points, then add molds 04, 04 and press mold (see Fig. 7 (3)), then 4 further bending operations To obtain a corrugated shape by bending a total of 11 locations.
[0006]
[Problems to be solved by the invention]
Since it is necessary to sequentially add dies in each bending process, the work is troublesome, requiring time and labor, and productivity is not good.
The present invention has been made in view of such a point, and the object of the process is to provide a sheet metal working method capable of improving productivity by an automatic flow operation.
[0011]
[Means for solving the problems and effects]
In order to achieve the above object, according to the first aspect of the present invention, there is provided a first bending process for bending a flat metal plate by a first mold having a first amplitude waveform, and a second amplitude. A first metal plate that moves the first bent metal plate to a second mold in which a waveform and a connection waveform that transitions from the second amplitude waveform to the first amplitude waveform and the first amplitude waveform are continuously formed. And a second bending process in which the first amplitude waveform portion of the second mold is aligned with the first amplitude waveform deformation portion of the first bent metal plate, and the second mold is bent. A second feeding step of moving the second bent metal plate to a third mold on which a second amplitude waveform is formed, and a second amplitude waveform deforming portion of the second bent metal plate The third bending process is performed by bending the third mold with the second amplitude waveform of the third mold. A sheet metal processing method and a process.
[0012]
The metal plate is first formed with a first amplitude waveform by the first mold, and then sent to the second mold to bend the first amplitude waveform portion repeatedly, and at the same time, a connecting waveform and a second amplitude waveform are formed. Then, it is sent to the third mold and the third amplitude waveform portion is repeatedly bent.
Accordingly, two types of waveforms having different amplitudes can be processed and formed by an automatic flow operation while performing bending twice, and productivity can be improved.
[0013]
According to a second aspect of the invention, the sheet metal processing method according to claim 1, wherein said first amplitude waveform and wherein the amplitude is less than the second amplitude waveform.
A large wave waveform can be continuously formed by connecting to the small wave waveform.
[0014]
According to a third aspect of the invention, the sheet metal processing method according to claim 1, characterized in that it comprises a laser processing step of a plurality cut metal pieces of the required shape by laser processing a metal plate subjected to the said bending .
[0015]
Rather than cutting metal pieces of the required shape by laser processing and then bending each metal piece, it is better to cut multiple pieces of metal pieces of the required shape by laser processing from the bent metal plate. It can be greatly reduced and productivity can be improved.
[0016]
According to a fourth aspect of the present invention, in the sheet metal processing method according to the third aspect , the metal piece subjected to the laser processing is a blade used in a tire mold.
[0017]
A blade that forms a plurality of cuts provided in a tire tread can be efficiently produced.
[0018]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, an embodiment according to the present invention will be described with reference to FIGS.
In the present embodiment, a blade used in a tire mold for forming a cut in a tire tread is manufactured.
[0019]
A schematic configuration diagram of a blade manufacturing apparatus 1 according to the present embodiment is shown in FIGS.
A first die 10, a second die 20, and a third die 30 to be pressed are arranged in order at predetermined intervals, and finally a laser drilling machine 40 is arranged at a predetermined position.
[0020]
Each of the molds 10, 20, and 30 includes a lower mold 11, 21, and 31 and an upper mold 12, 22, and 32, and the metal plate 2 is fed by a feeding device 5 between the upper and lower molds. Yes.
The lower mold 11 and the upper mold 12 of the first upstream mold 10 are composed of two triangular valleys having a small amplitude (the upper mold is a mountain, but the upper and lower molds are collectively referred to as the valley below). The lower mold 31 and the upper mold 32 having the small wave waveform portions 11a and 12a on the opposite mold surfaces are provided with large wave waveform portions 31a and 32a composed of two triangular valleys having a large amplitude. On opposite mold faces.
[0021]
The lower mold 21 and the upper mold 22 in the center second mold 20 are formed with two large wave waveform portions 21a and 22a on the upstream side on the opposite mold surface, and one small wave waveform portion 21c and one valley on the downstream side. 22c is formed, and one trough waveform portion 21b, 22b is continuously connected between the large wave waveform portions 21a, 22a and the small wave waveform portions 21c, 22c.
[0022]
In the blade manufacturing apparatus 1 as described above, the feeding device 5 moves so as to pull the metal plate 2 while holding the tip.
First, as shown in FIG. 1, a feeding device 5 feeds a long rectangular flat metal plate 2 between the lower mold 11 and the upper mold 12 of the first mold 10, and the first mold 10 as shown in FIG. To press work.
In the metal plate 2, two small wave waveforms are formed by bending.
[0023]
After the press working is completed, the metal plate 2 is moved between the lower die 21 and the upper die 22 of the second mold 20 by the feeding device 5, and the trough on the upstream side of the small wave deformation portion of the metal plate 2 is the second gold. It stops at a position corresponding to the small wave waveform portions 21c and 22c on the downstream side of the mold 20, and is pressed by the second mold 20 as shown in FIG.
[0024]
In addition to the small wave waveform, two large wave waveforms and a connecting waveform are newly formed on the metal plate 2 by bending.
The small wave deformation portion on the upstream side of the metal plate 2 is subjected to the second press working.
At the same time, pressing by the first mold 10 is also performed, and the next waveform is formed.
[0025]
Next, the metal plate 2 is moved between the lower mold 31 and the upper mold 32 of the third mold 30 by the feeding device 5, and the two troughs of the large wave deformed portion of the metal plate 2 are the large wave waveform of the third mold 30. It stops at a position corresponding to the portions 31c and 32c, and is pressed by the third mold 30 as shown in FIG.
[0026]
The large wave deformed portion formed on the metal plate 2 is subjected to the second press working.
At the same time, pressing by the second mold 20 and the first mold 10 is also performed.
In order for the third mold 30 and the second mold 20 to bend a predetermined portion of the metal plate 2 at the same time, the first mold 10 is set so that the feed amount of the metal plate 2 by the feeding device 5 is constant every time. The second mold 20 and the third mold 30 are arranged at an appropriate interval.
[0027]
Small holes 2 ₁ a slightly downstream side of the first waveform portion 2 ₁ is drilled in this way by the laser drilling machine 40 as shown in FIG. 5 after the portions first waveform 2 ₁ is completed in the metal plate 2.
After that, every time a certain amount of the metal plate 2 is fed by the feeding device 5, the press working by the first die 10, the second die 20, and the third die 30 is simultaneously performed, and the drilling by the laser drilling machine 40 is performed. sequentially corrugations 2 _{1, 2} 2, 2 _3, ... is gradually formed, the corrugations 2 _{1, 2} 2, 2 _3, small holes 2 ₁ a prior to ..., ₂ 2 a, 2 ₃ a , ... are drilled.
[0028]
As shown in FIG. 6, the metal plate 2 on which the waveform portions 2 ₁ , 2 ₂ , 2 ₃ ,... Cut out.
The time of laser processing small holes _{2 1 a, 2 2 a,} 2 3 a, and an image processing an image captured by the camera ...... at a predetermined position the small holes _{2 1 a, 2 2 a,} 2 3 a, ... Laser processing is performed while sequentially confirming the position of...
Therefore, no cumulative error occurs at the position where the metal plate 2 is subjected to laser processing.
[0029]
The metal piece 3 cut out by laser processing is finally bent again by a mold 50 for pressing the entire metal piece 3 as shown in FIG.
The portion that has been bent only once in the previous pressing step is also processed at least twice by the pressing with the mold 50, and the end portion is processed and formed into a final shape.
[0030]
Thus, the blade 4 as a finished product as shown in FIG. 8 is manufactured.
A large number of blades 4 are implanted on the surface of the tire vulcanization mold, and a large number of cuts can be formed in the tire tread.
[0031]
As described above, two types of waveforms having different amplitudes of the large wave waveform and the small wave waveform can be processed and formed by an automatic flow operation while performing at least two bending processes, and productivity can be improved.
[0032]
Bending of a large number of blades 4 is performed uniformly in the state of the metal plate 2 before being cut by the laser, so there is no need to bend each blade, and the number of blades can be greatly reduced by greatly reducing the number of bending processes. 4 can be manufactured efficiently.
[0033]
The final pressing shown in FIG. 7 can be performed only once or twice, does not affect the production efficiency so much, and may not be necessary in some cases.
In this press, a long die 50 is used, and a plurality of metal pieces 3 are arranged and processed at the same time so that a large number of blades 4 can be obtained at one time, thereby increasing the production efficiency.
[0034]
Next, a blade manufacturing apparatus 60 that forms a waveform having a constant amplitude will be described with reference to FIGS.
The mold 70 of the blade manufacturing apparatus 60 is a set, and the lower mold 71 and the upper mold 72 are formed on the mold surface where two triangular valleys having a constant amplitude are opposed to each other.
[0035]
The metal plate 62 is fed by the feeding device 65 between the lower mold 71 and the upper mold 72 of the mold 70 as shown in FIG. 9, and the first press work is performed by the mold 70 as shown in FIG. The
In the metal plate 62, two small wave waveforms are formed by bending.
[0036]
Next, the metal plate 62 is released, moved by one trough (mountain) by the feeding device 65, and pressed again by the mold 70 as shown in FIG.
Similarly, the process of moving by one valley and pressing it as shown in FIG. 12 is performed by moving one valley, and a continuous waveform having a constant amplitude is formed on the metal plate 62. The
[0037]
One trough of the corrugated deformation portion of the metal plate 62 is pressed twice except for the first trough.
Thus, a waveform having a constant amplitude can be processed and formed by an automatic flow operation, and productivity can be improved.
[0038]
A metal piece of a predetermined shape is cut from the metal plate 62 by laser machining, and the metal piece is subjected to final press working to produce a blade.
In addition, for laser processing for cutting out metal pieces, small holes may be drilled at predetermined intervals by a laser drilling machine as in the above embodiment.
[0039]
Further, by using the mold 10 or the mold 30 in the blade manufacturing apparatus 1 according to the above embodiment as the mold 70 of the present embodiment, a waveform with a constant amplitude can be formed on the metal plate. The blade manufacturing apparatus 1 that forms a waveform in which a large wave and a small wave are combined can also form a waveform having a constant amplitude.
[Brief description of the drawings]
FIG. 1 is a schematic configuration diagram of a blade manufacturing apparatus according to an embodiment of the present invention.
FIG. 2 is a schematic configuration diagram of the blade manufacturing apparatus showing a state of a next pressing step.
FIG. 3 is a schematic configuration diagram of the blade manufacturing apparatus showing a state of a next pressing step.
FIG. 4 is a schematic configuration diagram of the blade manufacturing apparatus showing a state of a next pressing step.
FIG. 5 is a schematic configuration diagram of the blade manufacturing apparatus showing a state of a next drilling step.
FIG. 6 is a plan view of a pressed metal plate.
FIG. 7 is a schematic view showing a pressing process using a final mold.
FIG. 8 is a perspective view of a manufactured blade.
FIG. 9 is a schematic configuration diagram of a blade manufacturing apparatus according to another embodiment.
FIG. 10 is a schematic configuration diagram of the blade manufacturing apparatus showing a state of a next pressing step.
FIG. 11 is a schematic configuration diagram of the blade manufacturing apparatus showing a state of a next pressing step.
FIG. 12 is a schematic configuration diagram of the blade manufacturing apparatus showing a state of a next pressing step.
FIG. 13 is a diagram showing a plurality of pressing steps by a conventional blade manufacturing apparatus.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Blade manufacturing apparatus, 2 ... Metal plate, 3 ... Metal piece, 4 ... Blade, 5 ... Feeding device,
10 ... 1st mold, 11 ... Lower mold, 12 ... Upper mold,
20 ... first mold, 21 ... lower mold, 22 ... upper mold,
30 ... first mold, 31 ... lower mold, 32 ... upper mold,
40… Laser punch, 50… Mold,
60 ... Blade manufacturing equipment, 62 ... Metal pieces, 65 ... Feeding equipment,
70 ... first mold, 71 ... lower mold, 72 ... upper mold.

Claims (4)

A first bending step of bending a flat metal plate with a first mold having a first amplitude waveform;
Move the first bent metal plate to a second mold in which a second amplitude waveform and a connection waveform that transitions from the second amplitude waveform to the first amplitude waveform and a first amplitude waveform are continuously formed. A first feeding step to perform,
A second bending step in which the first amplitude waveform portion of the second mold is matched with the first amplitude waveform deformation portion of the first bent metal plate, and bending is performed by the second die;
A second feeding step of moving the second bent metal plate to a third mold having a second amplitude waveform;
A third bending step in which the second amplitude waveform of the third mold is matched with the second amplitude waveform deforming portion of the second bent metal plate and bending is performed by the third die;
A sheet metal processing method characterized by comprising: The sheet metal processing method according to claim 1, wherein the first amplitude waveform is smaller in amplitude than the second amplitude waveform. 2. The sheet metal processing method according to claim 1, further comprising a laser processing step of cutting a plurality of metal pieces having a predetermined shape by laser processing on the bent metal plate. 4. The sheet metal processing method according to claim 3, wherein the laser-processed metal piece is a blade used in a tire mold.

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