JP7454408B2 - End face processing equipment and end face processing method - Google Patents

End face processing equipment and end face processing method Download PDF

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JP7454408B2
JP7454408B2 JP2020036061A JP2020036061A JP7454408B2 JP 7454408 B2 JP7454408 B2 JP 7454408B2 JP 2020036061 A JP2020036061 A JP 2020036061A JP 2020036061 A JP2020036061 A JP 2020036061A JP 7454408 B2 JP7454408 B2 JP 7454408B2
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典夫 高橋
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河村電器産業株式会社
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本発明は、例えば電気機器収納箱を作製するための金属板に対し、その端面を加工する端面加工装置及び端面加工方法に関する。 The present invention relates to an end surface processing apparatus and an end surface processing method for processing the end surface of a metal plate for producing, for example, an electrical equipment storage box.

電気機器収納箱は、プレス加工等で金属板を打ち抜いて型どりし、その後金属板を折り曲げて箱状に形成し、所定箇所を溶接した後塗装して作製している。こうして作製された従来の電気機器収納箱は、打ち抜かれた端面が鋭角な状態となっているため、塗装しても角部に塗料がのり難く、そのままでは錆が発生し易い。そのため、端面処理をして角部を落とした後塗装を施した。
この従来の端面処理には、例えば特許文献１に開示されているようなタレットパンチプレスの技術が使用された。
一方で、金属板の曲げ加工を行う装置としてプレスブレーキ（ベンディングマシン）があり、金属板の曲げ加工に広く使用されている。 Electrical equipment storage boxes are manufactured by punching and shaping a metal plate using a press process or the like, then bending the metal plate to form a box shape, welding at predetermined locations, and then painting. Since the conventional electrical equipment storage box manufactured in this way has a punched end face with an acute angle, it is difficult for paint to adhere to the corners even if painted, and rust is likely to occur if left as is. Therefore, the edges were treated and the corners were removed before painting.
For this conventional end face treatment, a turret punch press technique such as that disclosed in Patent Document 1 has been used, for example.
On the other hand, there is a press brake (bending machine) as a device for bending metal plates, and it is widely used for bending metal plates.

特開２００７－１１１７５３号公報Japanese Patent Application Publication No. 2007-111753

しかしながら、タレットパンチプレスは、穴を必要とするし、パンチの継ぎ目に錆の原因となる段差が発生し易かった。また上記特許文献１の技術は、ワークの全周を押さえる金型を使用することで、段差の発生を抑えることが可能であるが、異なる寸法に対応させようとするとワークの固定が難しく、同一寸法のワークに限定された。そのため、少量多品種には対応できなかった。
その点、プレスブレーキは長さの限定されない長尺の金属板の曲げ加工を容易に行うことができるため、少量多品種に対応し易い。 However, the turret punch press requires holes, and steps that cause rust are likely to occur at the punch joints. In addition, the technology of Patent Document 1 can suppress the occurrence of level differences by using a mold that presses the entire circumference of the workpiece, but it is difficult to fix the workpiece to accommodate different dimensions, and it is difficult to fix the workpiece to the same size. Limited to dimensional workpieces. As a result, it was not possible to handle small quantities and a wide variety of products.
On the other hand, press brakes can easily bend long metal plates of any length, making it easy to handle a wide variety of products in small quantities.

そこで、本発明はこのような問題点に鑑み、穴を必要とせずまた金属板の寸法が限定されないプレスブレーキにより、金属板の端面加工を可能とする端面加工装置及び端面加工方法を提供することを目的としている。 Therefore, in view of these problems, the present invention provides an end face processing device and an end face processing method that enable end face processing of a metal plate using a press brake that does not require holes and does not limit the dimensions of the metal plate. It is an object.

上記課題を解決する為に、請求項１の発明は、プレスブレーキのパンチ及びダイを使用して、金属板を表裏双方から挟み込んで金属板の端部を加工する端面加工装置であって、パンチ及びダイの少なくとも一方に、挟み込んだ金属板の端部に当接させて端面加工を行うための直線状の段部と、金属板の端部から一定の距離を設けた部位に溝を形成するための突起とを設け、突起は、段部と平行に配置された断面直角三角形で鋭角な先端を有する帯状体であって、直角な面が金属板の端部に向けて形成されていると共に、段部の金属板との当接部より先端が突出するよう形成され、突起が金属板の表面或いは裏面を押圧して溝を形成すると同時に、段部が金属板の端部に当接して端面加工を行うことを特徴とする。
この構成によれば、金属板に対してプレスブレーキにより端面加工を行うため、金属板の加工する辺が比較的長尺であっても容易に端面加工を実施できる。そして、プレスの際に金属板に突起が当接して溝を形成した後に端面加工が開始されるため、金属板の滑りを阻止できる。よって、金属板に対して孔加工すること無く確実な端面加工を実施できる。 In order to solve the above problem, the invention according to claim 1 is an end face processing device that processes the end portion of a metal plate by sandwiching the metal plate from both the front and back sides using a punch and a die of a press brake. and forming a groove on at least one of the dies, a linear stepped portion for performing end face processing by contacting the end of the sandwiched metal plate, and a groove at a portion provided a certain distance from the end of the metal plate. The protrusion is a belt-shaped body having a right triangular cross section and an acute tip, which is arranged parallel to the step , and the right-angled surface is formed toward the end of the metal plate. , the tip of the stepped part is formed so as to protrude from the contact part with the metal plate, and the protrusion presses the front or back surface of the metal plate to form a groove, and at the same time, the stepped part abuts the end of the metal plate. It is characterized by performing end face processing.
According to this configuration, since end face processing is performed on the metal plate using a press brake, end face processing can be easily performed even if the side of the metal plate to be processed is relatively long. Since end face processing is started after the protrusions come into contact with the metal plate during pressing to form the grooves, it is possible to prevent the metal plate from slipping. Therefore, reliable end face processing can be performed without drilling holes in the metal plate.

請求項２の発明は、請求項１に記載の構成において、パンチ及びダイの双方が段部及び突起を具備し、金属板の端面の表裏両側の加工を同時に行うことを特徴とする。
この構成によれば、金属板の表裏両面から端面加工を実施するため、良好な端面加工を実施できる。 The invention according to claim 2 is characterized in that, in the configuration according to claim 1, both the punch and the die are provided with steps and protrusions, and both the front and back sides of the end surface of the metal plate are processed at the same time.
According to this configuration, since end face processing is performed from both the front and back sides of the metal plate, good end face processing can be performed.

請求項３の発明は、請求項２に記載の構成において、パンチに形成された突起とダイに形成された突起とは、対峙する位置に無く、金属板の異なる部位に溝を形成するよう配置されて成ることを特徴とする。
この構成によれば、パンチ及びダイの突起により金属板の両面に溝が形成されても、溝が形成される部位が表裏で異なるため、溝形成による金属板の強度劣化を防止できる。 The invention according to claim 3 is the structure according to claim 2, in which the protrusions formed on the punch and the protrusions formed on the die are not located in opposing positions, but are arranged so as to form grooves in different parts of the metal plate. It is characterized by:
According to this configuration, even if grooves are formed on both sides of the metal plate by the protrusions of the punch and the die, the grooves are formed in different parts on the front and back sides, so deterioration in the strength of the metal plate due to the formation of the grooves can be prevented.

請求項４の発明は、プレスブレーキのパンチ及びダイを使用して、金属板を表裏双方から挟み込んで金属板の端部を加工する端面加工方法であって、パンチ及びダイの少なくとも一方に、挟み込んだ金属板の端部に当接させて端面加工を行うための直線状の段部と、金属板の端部から一定の距離を設けた部位に溝を形成するための突起とを設け、突起は段部と平行に配置された断面直角三角形で鋭角な先端を有する帯状体であって、直角な面が金属板の端部に向けて形成されており、突起が金属板の表面或いは裏面を押圧して溝形成を開始した後、段部を金属板の端部に当接させて端面加工を行うことを特徴とする。
この方法によれば、金属板に対してプレスブレーキを使用して端面加工を行うため、金属板の加工する辺が比較的長尺であっても容易に端面加工を実施できる。そして、プレスの際に金属板の加工面に対して直交する面に突起がめり込んだ後に端面加工が行われるため、金属板の滑りを阻止して端面加工を実施できる。よって、金属板に対して孔加工すること無く確実な端面加工を実施できる。
 The invention of claim 4 is an end face processing method for processing an edge of a metal plate by sandwiching the metal plate from both the front and back sides using a punch and a die of a press brake, the method comprising: The protrusion is provided with a straight step part for edge processing by contacting the edge of the metal plate, and a protrusion for forming a groove at a certain distance from the edge of the metal plate. is a band-shaped body with a right-angled cross-section and an acute tip , which is arranged parallel to the step, with the right-angled surface facing the end of the metal plate , and the protrusion that touches the front or back side of the metal plate. After pressing and starting groove formation, the step is brought into contact with the end of the metal plate to perform end face processing.
According to this method, the end face of the metal plate is processed using a press brake, so even if the side of the metal plate to be processed is relatively long, the end face can be easily processed. Then, since the end face processing is performed after the protrusion sinks into the surface perpendicular to the processed surface of the metal plate during pressing, the end face processing can be performed while preventing the metal plate from slipping. Therefore, reliable end face processing can be performed without drilling holes in the metal plate.

本発明によれば、金属板に対してプレスブレーキにより端面加工を行うため、金属板の加工する辺が比較的長尺であっても容易に端面加工を実施できる。そして、プレスして端面加工する形態であっても、プレスの際に金属板の加工面に対して直交する面の少なくとも一方に突起が当接して溝を形成するため、金属板の滑りを阻止できる。よって、金属板に対して孔加工すること無く確実な端面加工を実施できる。 According to the present invention, since end face processing is performed on a metal plate using a press brake, end face processing can be easily carried out even if the side of the metal plate to be processed is relatively long. Even if the end face is processed by pressing, the protrusions come into contact with at least one of the surfaces perpendicular to the processed surface of the metal plate during pressing to form a groove, preventing the metal plate from slipping. can. Therefore, reliable end face processing can be performed without drilling holes in the metal plate.

本発明に係る金属板の端面加工をプレスブレーキにより実施する端面加工装置の断面説明図であり、（ａ）はプレス中、（ｂ）はプレス後の図である。FIG. 2 is a cross-sectional explanatory view of an end face processing apparatus for performing end face processing of a metal plate using a press brake according to the present invention, in which (a) is a view during pressing, and (b) is a view after pressing. （ａ）は加工直前の端面加工装置の断面説明図、（ｂ）は加工後の金属板の断面図である。(a) is a cross-sectional explanatory view of the end face processing device immediately before processing, and (b) is a cross-sectional view of the metal plate after processing. 電気機器収納箱の要部断面説明図である。FIG. 2 is a cross-sectional explanatory diagram of a main part of an electrical equipment storage box. 端面処理された他の金属板の断面を示し、（ａ）は片面のみ処理した図、（ｂ）はＲ面処理した図、（ｃ）は溝形状を変更した図である。The cross-sections of other metal plates whose end surfaces have been treated are shown; (a) is a diagram in which only one side has been treated, (b) is a diagram in which the rounded surface has been treated, and (c) is a diagram in which the groove shape has been changed.

以下、本発明を具体化した実施の形態を、図面を参照して詳細に説明する。図１，２は本発明に係る端面加工装置の説明図であり、図１（ａ）は加工中の説明図、図１（ｂ）は加工後の説明図、図２（ａ）は加工直前の断面説明図、図２（ｂ）は加工後の金属板の断面図である。１は加工対象の金属板、２はプレスする上型（パンチ）、３は下型（ダイ）であり、端面加工装置はパンチ及びダイを備えたプレスブレーキで構成されている。 Embodiments embodying the present invention will be described in detail below with reference to the drawings. 1 and 2 are explanatory diagrams of the end face processing apparatus according to the present invention, in which FIG. 1(a) is an explanatory diagram during machining, FIG. 1(b) is an explanatory diagram after machining, and FIG. 2(a) is an explanatory diagram immediately before machining. FIG. 2(b) is a cross-sectional view of the metal plate after processing. 1 is a metal plate to be processed, 2 is an upper die (punch) to be pressed, and 3 is a lower die (die), and the end face processing device is composed of a press brake equipped with a punch and a die.

パンチ２及びダイ３の双方には、金属板１の表面或いは裏面に当接する平坦な面２ａ，３ａと、金属板１の端部Ｓに当接させて端面加工を行うための段部２１，３１が形成されている。ここでは、金属板１の端部Ｓの表裏両側の角部にＣ面が形成されるようパンチ２及びダイ３の双方に直線状の傾斜面を設けて段部２１，３１を形成している。 Both the punch 2 and the die 3 have flat surfaces 2a and 3a that come into contact with the front or back surface of the metal plate 1, and a stepped part 21 that comes into contact with the end S of the metal plate 1 to process the end surface. 31 is formed. Here, step portions 21 and 31 are formed by providing linear inclined surfaces on both punch 2 and die 3 so that C surfaces are formed at the corners on both the front and back sides of end S of metal plate 1. .

そして、段部２１，３１から一定の距離（例えば１０ｍｍ）をおいて、金属板１の側面（表面或いは裏面）に当接する突起２２，３２が、パンチ２及びダイ３のそれぞれに形成されている。この突起２２，３２は、断面直角三角形を成して鋭角な頂部を有する帯状体として形成され、段部２１，３１と平行に形成されている。尚、平坦な面２ａ，３ａに対して直角に起立する辺が端部Ｓに向けられて形成されている。 Protrusions 22 and 32 are formed on the punch 2 and the die 3, respectively, at a certain distance (for example, 10 mm) from the stepped portions 21 and 31 and abut against the side surface (front or back surface) of the metal plate 1. . The protrusions 22, 32 are formed as strips having a right triangular cross section and an acute apex, and are formed parallel to the step portions 21, 31. Note that the sides standing perpendicularly to the flat surfaces 2a and 3a are oriented toward the end S.

また、パンチ２に形成された突起２２は、ダイ３に形成された突起３２より段部２１に近い位置に形成され、互いに同一位置で対峙しないよう配置されている。
パンチ２、ダイ３により金属板１をプレスした際に、この突起２２，３２が金属板１を押圧して凹ませ、溝１１（１１ａ，１１ｂ）を形成する。そして、段部２１，３１が金属板１の端部に当接して端面加工が成される。 Further, the protrusions 22 formed on the punch 2 are formed closer to the step portion 21 than the protrusions 32 formed on the die 3, and are arranged so as not to face each other at the same position.
When the metal plate 1 is pressed by the punch 2 and the die 3, the protrusions 22 and 32 press the metal plate 1 to dent it and form the grooves 11 (11a, 11b). Then, the stepped portions 21 and 31 come into contact with the end portions of the metal plate 1 to perform end face processing.

ただし、図２（ａ）に示すように、段部２１，３１が金属板１に当接する前に、突起２２、３２が金属板１に当接するよう形成されている。具体的に、図２（ａ）に示すように、金属板１に段部２１，３１が最初に当接する当接部Ｂ１，Ｂ２より、突起２２，３２の先端が突出するよう形成されている。 However, as shown in FIG. 2(a), the protrusions 22 and 32 are formed to contact the metal plate 1 before the step portions 21 and 31 contact the metal plate 1. Specifically, as shown in FIG. 2(a), the tips of the protrusions 22, 32 are formed to protrude from contact portions B1, B2 where the stepped portions 21, 31 first contact the metal plate 1. .

結果、プレス動作により、段部２１，３１が金属板１に当接する前に溝１１ａ，１１ｂの形成が開始される。よって、段部２１，３１が金属板１の端部に当接した際に、突起２２，３２が金属板１の両側からめり込んでおり、金属板１が後方（矢印Ａの方向）へ移動するのが阻止され、図２（ｂ）に示すように金属板１の端部Ｓの表裏両側にＣ面を形成する端面加工が良好に実施され、面取りが成される。 As a result, the formation of the grooves 11a, 11b is started by the press operation before the step portions 21, 31 come into contact with the metal plate 1. Therefore, when the stepped portions 21 and 31 come into contact with the ends of the metal plate 1, the protrusions 22 and 32 sink into the metal plate 1 from both sides, and the metal plate 1 moves backward (in the direction of arrow A). As shown in FIG. 2(b), the end face processing to form a C surface on both the front and back sides of the end S of the metal plate 1 is successfully carried out and chamfering is achieved.

このように、金属板１に対してプレスブレーキにより端面加工を行うため、金属板１の加工する辺が比較的長尺であっても容易に端面加工を実施できる。そして、プレスの際に金属板１に突起２２，３２が当接して溝１１を形成した後に端面加工が開始されるため、金属板１の滑りを阻止できる。よって、金属板１に対して孔加工すること無く確実な端面加工を実施できる。
また、金属板１の表裏両面から端面加工を実施するため、良好な端面加工を実施できるし、パンチ２及びダイ３の突起２２，３２により金属板１の両面に溝１１が形成されても、溝１１が形成される部位が表裏で異なるため、溝１１の形成による金属板１の強度劣化を防止できる。 In this way, since the end face processing is performed on the metal plate 1 using a press brake, the end face processing can be easily carried out even if the side of the metal plate 1 to be processed is relatively long. Since end face processing is started after the protrusions 22 and 32 come into contact with the metal plate 1 during pressing to form the groove 11, slipping of the metal plate 1 can be prevented. Therefore, reliable end face processing can be performed without drilling holes in the metal plate 1.
In addition, since end face processing is performed from both the front and back sides of the metal plate 1, good end face processing can be performed, and even if the grooves 11 are formed on both sides of the metal plate 1 by the protrusions 22 and 32 of the punch 2 and die 3, Since the grooves 11 are formed in different parts on the front and back sides, deterioration in the strength of the metal plate 1 due to the formation of the grooves 11 can be prevented.

図３は、この加工により端面が面取りされた金属板１により作製された電気機器収納箱の一部を示し、前面側端部を断面で示している。５は箱本体、６は扉板である。
箱本体５の前面開口部５ａの周囲に形成された水切り部５１に、上述したプレスにより端面加工された金属板１の端部Ｓが配置されている。図３に示すように、端部Ｓが面取りされ、端部Ｓの近傍には溝１１が形成されている。 FIG. 3 shows a part of an electrical equipment storage box made from the metal plate 1 whose end face has been chamfered by this processing, and shows the front end in cross section. 5 is the box body, and 6 is the door plate.
An end S of the metal plate 1 whose end surface has been processed by the above-described press is arranged in a draining section 51 formed around the front opening 5a of the box body 5. As shown in FIG. 3, the end S is chamfered and a groove 11 is formed near the end S.

また、扉板６の折り曲げ形成された側面にも上述したプレスにより端面加工された金属板１の端部Ｓが配置されている。図３に示すように、端部Ｓが面取りされ、端部Ｓの近傍には溝１１が形成されている。
この端面加工により、金属板１の端部Ｓは角部がなくなり塗料をムラなく塗布することが可能となる。尚、近傍に形成された溝１１は小さいため、塗料が入り込み錆は発生し難い。 Further, the end S of the metal plate 1, which has been end-faced by the above-described press, is also arranged on the bent side surface of the door plate 6. As shown in FIG. 3, the end S is chamfered and a groove 11 is formed near the end S.
By this end face processing, the end S of the metal plate 1 has no corners and it becomes possible to apply the paint evenly. Note that since the grooves 11 formed in the vicinity are small, it is difficult for paint to enter and rust to occur.

図４は、端面加工の他の形態を示し、（ａ）は端部Ｓの片側のみＣ加工した場合、（ｂ）は端部Ｓの両側にＲ面を形成した場合、（ｃ）は溝１１の他の形状を示している。
パンチ２、ダイ３のうちの一方、例えばパンチ２に段部２１及び突起２２を形成し、ダイ３には何れも形成しなくても良く、その場合は図４（ａ）に示す端面形状となる。また、双方の段部２１，３１に所定の曲率のＲを形成すれば、図４（ｂ）に示すようにＲ加工を施した端面形状とすることができる。
更に、上記形態では突起２２，３２形状を断面直角三角形の形状として、段部２１，３１側に直角な面を配置したが、断面二等辺三角形であっても良く、図４（ｃ）はその場合の溝１１の形状を示している。
このように、用途に応じて端部Ｓの形状を変更できるし、端部Ｓの一方の角部のみ面取りすることも容易に実施できる。 FIG. 4 shows other forms of end face machining; (a) shows a case where only one side of the end S is machined with C, (b) shows a case where R surfaces are formed on both sides of the end S, and (c) shows a groove. 11 other shapes are shown.
One of the punch 2 and the die 3, for example, the punch 2, may be provided with the stepped portion 21 and the protrusion 22, and the die 3 may be provided with neither. In that case, the end face shape shown in FIG. 4(a) may be formed. Become. Further, by forming R of a predetermined curvature on both the step portions 21 and 31, it is possible to obtain an end face shape with R processing as shown in FIG. 4(b).
Further, in the above embodiment, the protrusions 22 and 32 have a right triangular cross section, and a right-angled surface is arranged on the step portions 21 and 31 side, but they may also have an isosceles triangular cross section, and FIG. 4(c) shows that. The shape of the groove 11 in this case is shown.
In this way, the shape of the end S can be changed depending on the application, and only one corner of the end S can be chamfered easily.

尚、上記実施形態では、電気機器収納箱を作製するための金属板１の加工について説明したが、本発明の端面加工は、金属板１の加工全般、特に屋外に設置される金属製の箱体を作製する金属板１の加工に対して好適である。
また、突起２２，３２を１本の帯状体として形成しているが、一定の長さとして複数に分離して形成しても良い。 In the above embodiment, the processing of the metal plate 1 for producing an electrical equipment storage box has been described, but the end face processing of the present invention is suitable for processing the metal plate 1 in general, especially for metal boxes installed outdoors. This is suitable for processing the metal plate 1 for producing a body.
Furthermore, although the protrusions 22 and 32 are formed as a single band-like body, they may be formed separately into a plurality of pieces each having a constant length.

１・・金属板、２・・パンチ、３・・ダイ、１１・・溝、２１・・段部、２２・・突起、３１・・段部、３２・・突起、Ｓ・・端部、Ｂ１，Ｂ２・・当接部。 1...Metal plate, 2...Punch, 3...Die, 11...Groove, 21...Step, 22...Protrusion, 31...Step, 32...Protrusion, S...End, B1 , B2...Abutment part.

Claims (4)

プレスブレーキのパンチ及びダイを使用して、金属板を表裏双方から挟み込んで前記金属板の端部を加工する端面加工装置であって、
前記パンチ及びダイの少なくとも一方に、挟み込んだ前記金属板の端部に当接させて端面加工を行うための直線状の段部と、前記金属板の端部から一定の距離を設けた部位に溝を形成するための突起とを設け、
前記突起は、前記段部と平行に配置された断面直角三角形で鋭角な先端を有する帯状体であって、直角な面が前記金属板の端部に向けて形成されていると共に、前記段部の前記金属板との当接部より先端が突出するよう形成され、
前記突起が前記金属板の表面或いは裏面を押圧して溝を形成すると同時に、前記段部が前記金属板の端部に当接して端面加工を行うことを特徴とする端面加工装置。 An end face processing device that processes an end of a metal plate by sandwiching the metal plate from both the front and back sides using a press brake punch and die,
At least one of the punch and the die has a linear stepped part for performing end face processing by contacting the end of the sandwiched metal plate, and a part provided at a certain distance from the end of the metal plate. Protrusions for forming grooves are provided,
The protrusion is a band-shaped body having a right triangular cross section and an acute tip , which is arranged parallel to the step , and has a right-angled surface facing toward the end of the metal plate, and the protrusion is arranged parallel to the step. is formed such that its tip protrudes from the contact portion with the metal plate,
An end face processing device characterized in that the protrusion presses the front or back surface of the metal plate to form a groove, and at the same time, the step portion abuts the end of the metal plate to perform end face processing. 前記パンチ及びダイの双方が前記段部及び前記突起を具備し、前記金属板の端面の表裏両側の加工を同時に行うことを特徴とする請求項１記載の端面加工装置。 2. The end face processing apparatus according to claim 1, wherein both the punch and the die are provided with the step portion and the protrusion, and both the front and back sides of the end face of the metal plate are processed at the same time. 前記パンチに形成された突起と前記ダイに形成された突起とは、対峙する位置に無く、前記金属板の異なる部位に溝を形成するよう配置されて成ることを特徴とする請求項２記載の端面加工装置。 3. The protrusion formed on the punch and the protrusion formed on the die are not located in opposing positions, but are arranged so as to form grooves in different parts of the metal plate. Edge processing equipment. プレスブレーキのパンチ及びダイを使用して、金属板を表裏双方から挟み込んで前記金属板の端部を加工する端面加工方法であって、
前記パンチ及びダイの少なくとも一方に、挟み込んだ前記金属板の端部に当接させて端面加工を行うための直線状の段部と、前記金属板の前記端部から一定の距離を設けた部位に溝を形成するための突起とを設け、前記突起は前記段部と平行に配置された断面直角三角形で鋭角な先端を有する帯状体であって、直角な面が前記金属板の端部に向けて形成されており、
前記突起が前記金属板の表面或いは裏面を押圧して溝形成を開始した後、前記段部を前記金属板の端部に当接させて端面加工を行うことを特徴とする端面加工方法。 An end face processing method in which the end of the metal plate is processed by sandwiching the metal plate from both the front and back sides using a punch and die of a press brake, the method comprising:
At least one of the punch and the die has a linear stepped portion for performing end face processing by contacting the end of the sandwiched metal plate, and a portion provided at a certain distance from the end of the metal plate. a protrusion for forming a groove on the metal plate, and the protrusion is a band-shaped body disposed parallel to the step and having a right triangular cross section and an acute tip , the perpendicular surface of which is located at the end of the metal plate. It is formed towards
An end face processing method, characterized in that after the protrusion presses the front or back surface of the metal plate to start forming a groove, the step portion is brought into contact with the end of the metal plate to perform end face processing.
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JP4200932B2 (en) 2003-04-25 2008-12-24 トヨタ自動車株式会社 Variable valve mechanism for internal combustion engine
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