JP2004025285A - Method for shearing steel sheet, and sheared still sheet - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an epoch-making working method by which burrs are not produced and an adhesive is not left in a product part by using a general shearing machine with which the commercialization of the shearing of a steel sheet of ≤ 0.4 mm is not succeeded by anyone heretofore, especially, a turret punching press which is the general shearing machine. <P>SOLUTION: In one embodiment of this steel shearing method, the steel sheet is shared by superimposing the steel sheet and a follow sheet so that at least a part of the steel sheet to be shared is made in cclose contact with the follow sheet through a liquid and they are fixed to each other at a portion other than the portion to be shared. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a shearing process for a thin plate in a press working technique, and particularly to a method of punching a thin plate having a thickness of 0.4 mm or less, a method of processing using a general-purpose shearing machine for performing drilling and the like, and a sheared thin plate. It is about.
[0002]
[Background Art]
Conventionally, as a shearing machine, a general-purpose shearing machine that performs a punching process such as a turret punching press, a unit punching press, a shearing machine, and a corner shearing machine has been widely used. Due to the clearance between the upper blade (punch) and the lower blade (die), it is almost impossible for a shearing machine typified by this turret punching press to machine a thin plate of 0.4 mm or less. In order to set a small clearance, high-precision vertical position adjustment was required, and it could not be put to practical use. In addition, even in the case of an expensive latest processing machine, it is a fact that only a shearing process of about 0.1 mm can be performed.
[0003]
A method of processing a thin plate having a thickness of 0.5 mm or less using a general-purpose punching machine is disclosed in Japanese Patent Application Laid-Open No. 2000-301256 (applicant: Miyako Seisakusho) and has been put to practical use. According to this processing method, a thin plate for punching is temporarily bonded to a discarded plate, punched out, and then separated from the discarded plate. According to JIS adhesive / adhesion terminology (K6800-1985), the term “adhesion” refers to No. 70 “a state in which two surfaces are bonded by an adhesive as a medium and by scientific or physical force or both”. In addition, the specification of the above-mentioned publication also discloses that an adhesive having a property of “sticking and peeling” is applied to one side of a plate to perform adhesive fixing. After processing, the adhesive is immersed and dissolved in a thinner or the like, and the thin plate is separated from the discarded plate. According to the applicant's website, it is disclosed that a 0.1 mm thin plate can be processed by this method.
[0004]
In addition, there has been a demand for punching or drilling a thin plate having a thickness of less than 0.1 mm to form a shim plate having a desired shape, but it has not been put to practical use yet.
[0005]
[Problems to be solved by the invention]
However, in the invention of Japanese Patent Application Laid-Open No. 2000-301256, it is difficult to process a thin plate having a thickness of less than 0.1 mm, and even a thin plate having a thickness of 0.5 mm is burred on the lower blade side as disclosed in the specification. Had occurred. Since the bonding is to bond the boards by solidifying the adhesive, in this method, there is inevitably the thickness of the solidified adhesive between the thin plate and the discarded plate during processing, and the thin plate and the discarded plate are substantially It is considered that burrs are generated because they do not adhere. When burrs were generated on the product thin plate, a processing step of deburring was required. In particular, in the case of a thin plate having a thickness of less than 0.1 mm, deburring was very difficult.
[0006]
In addition, in this method, since the plates are fixed to each other with an adhesive, it is impossible to perform processing while the adhesive is adhesive, that is, while the adhesive is not solidified and fixed, and further discarded as a thin plate after the processing. A step of dissolving the adhesive for separating the boards was required.
[0007]
However, regardless of this method, even if the thin plate and the discard plate are simply overlapped, the thin plate having a thickness of 0.4 mm or less, especially less than 0.1 mm hangs down like paper, and a large gap is generated between the thin plate and the discard plate. Can not be processed.
[0008]
Therefore, as a result of repeated studies, the present inventor has made a thin plate having a thickness of 0.4 mm or less, which has not been successfully commercialized, a general-purpose shearing machine, particularly a turret punching press machine, without burrs, We have invented a revolutionary processing method in which no adhesive remains on the product part, and a thin plate obtained by the method.
[0009]
[Means for Solving the Problems]
According to one embodiment of the present invention, there is provided a method of performing a shearing process by laminating a thin plate and a waste plate, wherein at least a portion of the thin plate to be sheared and the waste plate are in close contact with each other via a liquid. The thin plate is fixed to the discard plate avoiding a portion where the thin plate is subjected to shearing, and the thin plate and the discard plate are subjected to shearing in a state of close contact with a liquid.
[0010]
According to one embodiment of the present invention, a sheared thin plate can be obtained without generating burrs by shearing the thin plate and the discarded plate while maintaining the close contact state via the liquid. According to the present inventor, the liquid in the portion to be sheared at the time of shearing is extruded, and the thin plate and the discarded plate are in a state of being completely adhered and hardly intervening with the liquid and are subjected to the shearing process. It is presumed that a product without burrs can be obtained even with a thin plate of. Since no burrs are generated, no deburring step is required. In addition, since the liquid is used, it can be easily wiped off after processing, and a step of dissolving the solidified adhesive as in the related art is not required. Furthermore, the thin plate and the discard plate are not integrated because they only adhere to each other with the liquid alone, and they are easily displaced during processing.However, fixing them in a place that avoids the part to be sheared adversely affects the processing. Shearing can be performed without giving. The clearance in the radial direction between the upper blade and the lower blade may be a clearance for ordinary shearing, and the processing can be easily performed without using an expensive processing machine capable of setting a clearance with high precision.
[0011]
Here, it is preferable that the thin plate and the discard plate are fixed at a portion other than a product part of the thin plate.
[0012]
With such a configuration, since the product part of the thin plate is not fixed to the waste plate, it can be easily separated from the waste plate after shearing, and the thin plate other than the product part remains fixed to the waste plate. May be disposed of.
[0013]
Further, the thin plate and the discard plate may be made of metal, and the fixing of the thin plate and the discard plate is preferably welding.
[0014]
With such a configuration, the state in which the thin plate and the discard plate are in close contact with the liquid can be reliably maintained by welding, and the thin plate and the discard plate do not shift during processing.
[0015]
In addition, it is preferable that the shearing is performed by punching using a punch and a die, the thin plate is arranged on a die side, and the thin plate is pressed by a punch from the disposal plate side.
[0016]
With such a configuration, although some burrs are generated on the discarded plate, it is possible to perform drilling without generating burrs on the thin plate.
[0017]
Further, the liquid is desirably oil.
[0018]
With such a configuration, even if the liquid leaks from between the thin plate and the discarded plate, it is an oil, so the maintenance of the processing machine is easy, and the liquid is always present at the processing site. There is no need and the cost merit is high.
[0019]
Still further, it is preferable that the thin plate and the waste plate are larger in the waste plate than the thin plate, and the thin plate and the waste plate are fixed along a peripheral portion of the thin plate.
[0020]
By adopting such a configuration, a portion to be sheared can be avoided and the thin plate can be fixed along the periphery thereof, so that the area of the thin plate that can be sheared can be increased.
[0021]
The sheared thin plate of one embodiment of the present invention is to adhere at least a portion of the thin plate to be sheared and the discarded plate via a liquid, and avoid the portion of the thin plate to be sheared into the discarded plate. The thin plate and the discarded plate are fixed and subjected to shearing processing in a state of close contact with the liquid, and are separated from the discarded plate after the shearing processing.
[0022]
The thin plate obtained by such a process has no burrs, and after being separated from the discard plate, can be made into a product by simply wiping off the attached liquid.
[0023]
Further, the thin plate may be made of a metal having a thickness of 0.01 mm to 0.09 mm, and the discarded plate preferably has a thickness of 0.4 mm or more.
[0024]
Heretofore, there has been no metal sheet having a thickness of less than 0.1 mm which has been subjected to shearing processing, and it is possible to cope with a long-awaited demand for a thin sheet, in particular, a shim sheet market, at a low cost without increasing the processing time.
[0025]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the drawings.
[0026]
1 to 3 are views showing a shearing method according to an embodiment of the present invention.
[0027]
In the present embodiment, a description will be given of a boring process in which a shearing process is performed by punching and pressing using a general-purpose turret punching press machine and a member having a remaining hole is used.
[0028]
First, in FIG. 1, a die 3 forming a lower blade is provided below the figure, and a punch 1 forming an upper blade guided by a guide 2 is arranged above the figure. The clearance in the radial direction between the punch 1 and the die 3 is set to 0.3 mm, which is the same as when a normal 2.0 mm thick plate is processed.
[0029]
Between the punch 1 and the die 3, a discard plate 4 and a thin plate 5, which are members to be processed (the material is iron), are arranged so that the thin plate 5 is placed on the die 3. In the turret punching press, the discarded plate 4 as a workpiece is held by a clamp (not shown), and the workpiece is moved in accordance with a preset program to perform drilling at a desired position. At this time, it is necessary to prevent the thin plate from being displaced and the close contact state from being released.
[0030]
The discard plate 4 and the thin plate 5 are in close contact with each other via a liquid oil layer 7, and are joined and fixed by spot welding 6 near both ends of the thin plate 5. The spot weld 6 is located at a position avoiding the sheared surface indicated by the dotted line in the figure, and is joined and fixed so that the close contact between the discarded plate 4 and the thin plate 5 can be reliably maintained. The amount of the oil layer 7 is not too large, and only needs to be such that the discard plate 4 and the thin plate 5 are in close contact with each other. Although the thickness of the thin plate 5 is 0.01 mm and the thickness of the thin plate 4 is 2 mm, the thickness of the thin plate 5 and the thickness of the thin plate 5 are shown as extremely large in the figure for easy explanation. I have.
[0031]
Next, as shown in FIG. 2, when the punch 1 and the guide 2 descend and the guide 2 presses the discard plate 4 and the thin plate 5 with a predetermined pressure, the shearing portion 8 inside the shearing surface shown by the dotted line and In the abutting portion of the guide 2, it is expected that the oil of the oil layer 7, which is a liquid, escapes (flows), and the discard plate 4 and the thin plate 5 are almost completely in close contact (direct contact). At this time, since the discard plate 4 and the thin plate 5 are fixed by the spot welding 6, a predetermined positional relationship can be maintained without displacement.
[0032]
Further, as shown in FIG. 3, as the punch 1 further descends, the sheared portion 8 is punched, and holes are made in the discarded plate 4 and the thin plate 5.
[0033]
At the time of shearing, it is considered that the oil layer 7 hardly exists between the discarded plate 4 and the thin plate 5 of the sheared portion 8. Therefore, since the discarded plate 4 and the thin plate 5 are almost completely adhered to each other without any gap, the thin plate 5 of the workpiece to be processed, which is apparently an integral body, is formed with a desired size without burrs. Is thought to be performed. By the way, although some burrs were generated on the discard plate 4, there is no problem because it is unrelated to the product.
[0034]
By continuously performing the punching press and performing the overtaking, a workpiece to be processed as shown in FIG. 4 can be obtained, for example. The thin plate 5 is taken out from the turret punching press in a state where the thin plate 5 is joined and fixed to the disposal plate 4 at a plurality of positions along the peripheral edge of the thin plate 5 by spot welding 6. By fixing along the peripheral edge of the thin plate 5 in this way, a portion that can be subjected to shearing, that is, a product portion, can be made as large as possible. The fixing by the spot welding 6 is performed while avoiding the product portion and the shearing portion, and it is sufficient that the discarding plate 4 and the thin plate 5 are fixed to the extent that they do not shift in the lateral direction while maintaining the close contact state during the processing. The intervals between the spot welds 6 may be set at required intervals while the processing operator checks the close contact state. In the present embodiment, the welding is performed at intervals of about 150 mm. In FIG. 4, the punched hole 11 is indicated by oblique lines for easy understanding.
[0035]
The thin plate 5 is formed in an unnecessary portion 10 where the inside of the substantially rectangular punched hole 11 is a product 9 and the outside is discarded together with the discard plate 4. The corners of the product 9 remain connected to the unwanted parts 10 by micro joints.
[0036]
When the microjoint is detached, the product 9 is removed from the unnecessary portion 10 and removed from the discard plate 4, a thin product 9 without shearing and having a thickness of 0.01 mm, which has been almost impossible until now, can be obtained. did it. At this time, the product 9 is merely in close contact with the waste plate 4 via the oil layer, and can be easily removed, and only the remaining oil needs to be wiped off.
[0037]
According to an experiment conducted by the present inventors, the thin plate of the present invention having a thickness of 0.1 mm to 0.4 mm did not generate burrs unlike the prior art in which the thin plates were bonded and laminated. Further, even with a thin plate of less than 0.1 mm, for example, 0.01 mm to 0.09 mm, which could not be implemented by the conventional technology, a product with high dimensional accuracy without burrs could be obtained in the present invention.
[0038]
The present invention is not limited to the above embodiments, and can be modified into various forms within the scope of the present invention.
[0039]
For example, in the above-described embodiment, the boring process has been described, but a punching process using a member separated from the original workpiece may be used. In this case, since the punched product portion is not joined by welding or the like, it can be easily separated from the discarded plate, and becomes a product if the oil layer of the product portion is wiped off.
[0040]
In the above-described embodiment, a turret punching press is used. However, a press machine that performs shearing may be used.
[0041]
Further, in the above-described embodiment, oil is used as the liquid. However, the liquid is not limited to oil, but may be any liquid that is easy to flow, as long as the thin plate and the discard plate can be brought into close contact to some extent.
[0042]
Further, although iron is used as the member to be processed in the above embodiment, aluminum or other metal may be used as long as the material is used for press working, and wood, paper, etc. may be used as the discarded plate.
[0043]
Furthermore, in the above-described embodiment, since iron is used as the workpiece, the thin plate and the discarded plate are fixed by spot welding, which is a type of pressure welding, but other joining means, for example, gas classified as fusion welding Welding, mechanical joining by bolts or clips, brazing, adhesion around the thin plate to the discarded plate with adhesive tape, a position sufficiently away from the part to be processed (the discarded plate and the thin plate are in close contact during the shearing process) May be used as long as the position can be maintained). The point is that there is nothing to change the thickness of the sheared portion between the thin plate and the discard plate except for the liquid, and it is only necessary that the integrated state can be maintained while being conveyed and processed in the press machine. When the outer shape of a thin plate is the product itself, and when a part of the thin plate is made into a finished product by drilling, a mechanical joint that temporarily fixes the periphery of the thin plate to a discarded plate rather than welding that completely fixes the thin plate Adhesion and adhesion are advantageous. In particular, when the peripheral portion of the thin plate is adhered to the discard plate from above with an adhesive tape and fixed, there is no gap between the thin plate and the discard plate, which is simple and advantageous.
[0044]
If the thin plate is small and the close contact between the thin plate and the discarded plate can be maintained, the four corners of the thin plate can be fixed by fixing means such as spot welding, and a narrow area around the fixed portion can be separated from the product together with the discarded plate. It may be sheared as follows.
[Brief description of the drawings]
FIG. 1 is an explanatory diagram illustrating a shearing process according to an embodiment of the present invention.
FIG. 2 is an explanatory view showing a shearing process according to the embodiment.
FIG. 3 is an explanatory view showing a shearing process according to the embodiment.
FIG. 4 is a perspective view showing a member to be processed after shearing according to the embodiment.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Punch 2 Guide 3 Die 4 Discard plate 5 Thin plate 6 Spot welding 7 Oil layer 8 Shear processing part 9 Product 10 Unnecessary part 11 Punched hole

Claims (8)

In the method of shearing by overlapping a thin plate and a discarded plate,
At least a portion of the thin plate to be sheared and the discarded plate are brought into close contact with each other via a liquid, and the thin plate is fixed to the discarded plate avoiding a portion of the thin plate to be sheared,
A shearing method, wherein the thin plate and the discarded plate are subjected to shearing processing in a state of close contact with the liquid. In claim 1,
The said thin plate and the said waste plate are being fixed in parts other than the product part of the said thin plate, The shearing processing method characterized by the above-mentioned. In claim 2,
The thin plate and the waste plate are metal,
The shearing method, wherein the fixing of the thin plate and the waste plate is welding. In claim 1,
The shearing is a drilling performed using a punch and a die,
A shearing method comprising: arranging the thin plate on a die side and pressing the thin plate with a punch from the discarded plate side. In claim 1,
The said liquid is oil, The shearing processing method characterized by the above-mentioned. In claim 1,
The thin plate and the waste plate, the waste plate is larger than the thin plate,
The shearing method, wherein the thin plate and the discard plate are fixed along a peripheral portion of the thin plate. At least the portion of the thin plate to be sheared and the discarded plate are brought into close contact with each other via a liquid, and the thin plate is fixed to the discarded plate avoiding the portion of the thin plate to be sheared. A sheared thin plate obtained by performing a shearing process in a state of close contact with the substrate and separating from the discarded plate after the shearing process. In claim 8,
The thin plate is a metal plate having a thickness of 0.01 mm to 0.09 mm, and the discarded plate has a thickness of 0.4 mm or more.

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