JP5313641B2

JP5313641B2 - Press bending tool

Info

Publication number: JP5313641B2
Application number: JP2008299119A
Authority: JP
Inventors: 攻牧野
Original assignee: 攻牧野
Priority date: 2008-11-25
Filing date: 2008-11-25
Publication date: 2013-10-09
Anticipated expiration: 2028-11-25
Also published as: JP2010125454A

Description

本発明は、ベンディングマシンなどのプレス加工機械に取り付けられて、金属板などの曲げ加工を行うプレス曲げ加工用工具（以下、曲げ工具という。）に関する。 The present invention relates to a press bending tool (hereinafter referred to as a bending tool) that is attached to a pressing machine such as a bending machine and performs bending of a metal plate or the like.

機械部品の一つに断面略ハット形（又はフランジ付きの断面略Ｕ字形）の金具がある。一般に、この種の金具は金属板がベンディングマシン（他に、プレスブレーキとも呼ばれる。）などのプレス加工機械により曲げ加工されて製造されている。 One of the mechanical parts is a metal fitting having a substantially hat-shaped cross section (or a substantially U-shaped cross section with a flange). Generally, this type of metal fitting is manufactured by bending a metal plate by a pressing machine such as a bending machine (also called a press brake).

ベンディングマシンによって金属板を断面略ハット形に折り曲げ加工する場合、まず、ベンディングマシンのスライダの下端部に断面略Ｕ字形の突状加圧部を有する上型を取付金具で固定して装着するとともに、ベンディングマシンのベッドに溝形形状の下型を取付金具で固定して装着する。そして、金属板を加工するときに、金属板を下型上に載せ、位置決めした後、上型を下降して断面略Ｕ字形の突状加圧部を金属板の上から下型に加圧挿入することによって、金属板が上型と下型との間で加圧されてアール曲げ加工され、断面略ハット形に成形される。この種の曲げ工具は例えば特許文献１に記載されているので、参照されたい。
特開２００４−１７４５３１公報 When bending a metal plate into a substantially hat-shaped cross section with a bending machine, first, an upper die having a projecting pressure portion having a substantially U-shaped cross section is fixed to the lower end portion of the slider of the bending machine with a mounting bracket. The lower die of the groove shape is fixed to the bed of the bending machine with a mounting bracket. Then, when processing the metal plate, after placing and positioning the metal plate on the lower mold, the upper mold is lowered and the protruding pressurizing portion having a substantially U-shaped cross section is pressed from above the metal plate to the lower mold. By inserting the metal plate, the metal plate is pressed between the upper die and the lower die, is rounded, and formed into a substantially hat-shaped cross section. This type of bending tool is described in, for example, Japanese Patent Application Laid-Open No. H10-294707, so please refer to it.
Japanese Patent Laid-Open No. 2004-174551

しかしながら、プレス加工機械で断面略ハット形の金具を製造する場合、金具のアール寸法、すなわちアール形状部の曲率半径が異なる複数の種類の金具を製作しようとすると、その寸法が僅かな違いであっても、当該寸法に合わせて複数の種類の金型を用意する必要があり、その上型及び下型の製作に要するコストは増大し、金具の製造コストが上昇する、という問題がある。また、このプレス曲げ加工では、アール曲げ加工された金属板のスプリングバックにより、金具の両側面が開いて平行になっていなかったり、また金具両端のフランジが開いて金具の両側面に対して直角になっていなかったりするなど、金具の形状凍結不良が発生することがあり、このような場合、金具に所定の形状を出すために２次加工を行ったり金型を作り直したりする必要があり、また金具の形状不良を防止しようとすると金型それ自体に特殊な構造（特許文献１参照）を備える必要があり、金具の製造コストはさらに増加する、という問題がある。 However, when manufacturing a metal fitting with a substantially hat-shaped cross section with a press machine, if you attempt to produce multiple types of metal fittings with different rounded dimensions, that is, radius of curvature of the rounded shape, the dimensions differ slightly. However, it is necessary to prepare a plurality of types of molds according to the dimensions, and there is a problem that the cost required for manufacturing the upper mold and the lower mold increases, and the manufacturing cost of the metal fitting increases. Also, in this press bending process, both sides of the bracket are not parallel due to the spring back of the rounded metal plate, or the flanges on both ends of the bracket are opened and perpendicular to both sides of the bracket. In such a case, it may be necessary to perform secondary processing or remake the mold in order to obtain a predetermined shape on the metal fitting. In addition, there is a problem that the metal mold itself needs to have a special structure (see Patent Document 1) to prevent the defective shape of the metal fitting, and the production cost of the metal fitting further increases.

本発明は、このような従来の問題を解決するもので、この種の曲げ工具において、断面略ハット形の金具を製造する場合、それがアール形状部の曲率半径が異なる複数の種類の金具を製造する場合であっても、簡易な金型構造で、加工の工程を増やすことなしに、金属板を、形状不良を防止しつつ所定の形状に確実かつ容易に曲げ加工し、以って金具の製造コストの低減を図ること、を目的とする。 The present invention solves such a conventional problem. When a metal fitting having a substantially hat-shaped cross section is manufactured with this type of bending tool, it is provided with a plurality of types of metal fittings having different radiuses of curvature at the round-shaped portions. Even when manufacturing, with a simple mold structure, without increasing the number of processing steps, a metal plate can be reliably and easily bent into a predetermined shape while preventing a defective shape, thereby providing a metal fitting. An object of the present invention is to reduce the manufacturing cost.

上記目的を達成するために、本発明の曲げ工具は、上型と下型とを備え、プレス加工機械に装着されて、金属板を断面略ハット形の断面形状に曲げ加工するプレス曲げ加工用工具において、前記上型は、下部に水平ガイド面及び垂直ガイド面を有し、当該垂直ガイド面の下端エッジから当該垂直ガイド面の向きとは反対方向に向けて所定角度の加圧面を有する上型本体と、上端に水平面、一側面に垂直面を有し、当該垂直面の下端エッジから当該垂直面の向きとは反対方向に向けて所定角度の加圧面を有し、前記上端が前記上型本体の水平ガイド面に当接され、前記一側面が前記上型本体の垂直ガイド面に対向して、前記上型本体に着脱可能に固定される上型アタッチメントと、前記上型本体と前記上型アタッチメントとの間に挟持され、前記上型本体に前記上型アタッチメントとともに固定されて、前記上型本体及び前記上型アタッチメントの各下端加圧面から下方に向けて突出される上型形状部材とを備え、前記上型形状部材の突出端に所定の断面形状の突状加圧部が形成され、前記下型は、上部に水平ガイド面及び垂直ガイド面を有し、当該垂直ガイド面の上端エッジから当該垂直ガイド面とは反対方向に向けて所定角度の加圧面を有する下型本体と、下端に水平面、一側面に垂直面を有し、当該垂直面の上端エッジから当該垂直面とは反対方向に向けて所定角度の加圧面を有し、前記下端が前記下型本体の水平ガイド面に当接され、前記垂直面が前記下型本体の垂直ガイド面に対向して、前記下型本体に着脱可能に固定される下型アタッチメントとを備え、前記下型本体の垂直ガイド面と前記下型アタッチメントの垂直面との間に、前記上型本体の上型形状部材が加圧挿入される溝が形成される。そして、上型の、上型本体の加圧面は前記上型本体の垂直ガイド面の下端エッジから当該垂直ガイド面の向きとは反対方向へ上方に向けて傾斜され、上型アタッチメントの加圧面は前記上型アタッチメントの垂直面の下端エッジから当該垂直面の向きとは反対方向へ上方に向けて傾斜され、当該各加圧面と水平面とのなす傾斜角は３．５°に設定され、他方、下型の、下型本体の加圧面は前記下型本体の垂直ガイド面の上端エッジから当該垂直ガイド面の向きとは反対方向へ上方に向けて傾斜され、下型アタッチメントの加圧面は前記下型アタッチメントの垂直面の上端エッジから当該垂直面の向きとは反対方向へ上方に向けて傾斜され、当該各加圧面と水平面とのなす傾斜角は２．０°に設定される、ことを要旨とする。 In order to achieve the above object, a bending tool of the present invention comprises an upper die and a lower die, and is mounted on a press machine to bend a metal plate into a substantially hat-shaped cross-sectional shape. In the tool, the upper mold has a horizontal guide surface and a vertical guide surface at a lower portion, and an upper surface having a pressurizing surface at a predetermined angle from a lower end edge of the vertical guide surface in a direction opposite to the direction of the vertical guide surface. The mold body has a horizontal surface at the upper end and a vertical surface on one side surface, and has a pressing surface at a predetermined angle from the lower edge of the vertical surface to the direction opposite to the direction of the vertical surface, and the upper end is the upper surface. An upper mold attachment that is in contact with a horizontal guide surface of the mold body, and whose one side face is opposed to a vertical guide surface of the upper mold body, and is detachably fixed to the upper mold body; Sandwiched between the upper mold attachment and the front An upper mold-shaped member fixed to the upper mold main body together with the upper mold attachment and projecting downward from the lower end pressure surfaces of the upper mold main body and the upper mold attachment; A projecting pressure portion having a predetermined cross-sectional shape is formed at an end, and the lower mold has a horizontal guide surface and a vertical guide surface at an upper portion, and the direction opposite to the vertical guide surface from the upper end edge of the vertical guide surface A lower mold body having a pressing surface at a predetermined angle toward the surface, a horizontal surface at the lower end, a vertical surface at one side surface, and a pressing surface at a predetermined angle from the upper edge of the vertical surface in a direction opposite to the vertical surface A lower mold in which the lower end is in contact with a horizontal guide surface of the lower mold body, and the vertical surface faces the vertical guide surface of the lower mold body and is detachably fixed to the lower mold body An attachment, and the lower mold body Between the vertical surface of the lower mold attachment straight guide surface, the upper mold shaped member of said upper mold body Ru groove is formed to be inserted under pressure. And, the pressure surface of the upper mold body of the upper mold is inclined upward from the lower edge of the vertical guide surface of the upper mold body in the direction opposite to the direction of the vertical guide surface, and the pressure surface of the upper mold attachment is Inclined upward from the lower end edge of the vertical surface of the upper attachment in a direction opposite to the direction of the vertical surface, and the inclination angle formed by each pressure surface and the horizontal surface is set to 3.5 °, The pressure surface of the lower mold body is inclined upward from the upper edge of the vertical guide surface of the lower mold body in the direction opposite to the direction of the vertical guide surface, and the pressure surface of the lower mold attachment is It is inclined upward from the upper end edge of the vertical surface of the mold attachment in the direction opposite to the direction of the vertical surface, and the inclination angle formed by the pressure surface and the horizontal surface is set to 2.0 °. And

そして、この曲げ工具の場合、各部が次のように具体化されることが好ましい。
（１）上型の上型本体の垂直ガイド面と上型アタッチメントとの間で前記上型本体の水平ガイド面及び上型形状部材間にスペーサが介挿され、これら上型本体、上型形状部材、及び上型アタッチメント間にねじ通し孔が形成されて、当該ねじ通し孔にボルトが通されてねじ締結される。
（２）上型の上型形状部材の突状加圧部は断面略Ｕ字形又は断面略コ字形に形成される。
（３）上型の上型形状部材の突状加圧部先端に着脱可能な、曲率半径の異なる複数のアール形状部材を併せて備える。
（４）下型の下型本体は垂直ガイド面に対向して所定の間隔で垂直固定面が並設され、この垂直固定面と下型アタッチメントとの間にスペーサが介在され、これら垂直固定面、スペーサ、及び下型アタッチメント間にねじ通し孔が形成されて、当該ねじ通し孔にボルトが通されてねじ締結される。
（５）上型の、上型本体の加圧面は前記上型本体の垂直ガイド面の下端エッジから当該垂直ガイド面の向きとは反対方向へ上方に向けて傾斜され、上型アタッチメントの加圧面は前記上型アタッチメントの垂直面の下端エッジから当該垂直面の向きとは反対方向へ上方に向けて傾斜され、当該各加圧面と水平面とのなす傾斜角は３．５°に設定され、他方、下型の、下型本体の加圧面は前記下型本体の垂直ガイド面の上端エッジから当該垂直ガイド面の向きとは反対方向へ上方に向けて傾斜され、下型アタッチメントの加圧面は前記下型アタッチメントの垂直面の上端エッジから当該垂直面の向きとは反対方向へ上方に向けて傾斜され、当該各加圧面と水平面とのなす傾斜角は２．０°に設定される。 And in the case of this bending tool, it is preferable that each part is actualized as follows.
(1) A spacer is interposed between the horizontal guide surface of the upper mold body and the upper mold shape member between the vertical guide surface of the upper mold body of the upper mold and the upper mold attachment, and these upper mold body and upper mold shape A screw-through hole is formed between the member and the upper die attachment, and a bolt is passed through the screw-through hole to be screwed.
(2) The protruding pressure part of the upper mold member of the upper mold is formed in a substantially U-shaped cross section or a substantially U-shaped cross section.
(3) A plurality of round-shaped members having different radii of curvature that can be attached to and detached from the tip of the protruding pressure portion of the upper mold-shaped member of the upper mold are also provided.
(4) The lower mold body of the lower mold has a vertical fixing surface arranged in parallel at a predetermined interval facing the vertical guide surface, and a spacer is interposed between the vertical fixing surface and the lower mold attachment. A screw-through hole is formed between the spacer and the lower mold attachment, and a bolt is passed through the screw-through hole to be screwed.
(5) The pressure surface of the upper mold body is inclined upward from the lower edge of the vertical guide surface of the upper mold body in the direction opposite to the direction of the vertical guide surface, and the pressure surface of the upper mold attachment Is inclined upward from the lower end edge of the vertical surface of the upper attachment in the direction opposite to the direction of the vertical surface, and the inclination angle formed between the pressure surface and the horizontal surface is set to 3.5 °, The lower mold body pressure surface is inclined upward from the upper edge of the lower mold body vertical guide surface in the direction opposite to the direction of the vertical guide surface, and the lower mold attachment pressure surface is The lower die attachment is inclined upward from the upper end edge of the vertical surface in a direction opposite to the direction of the vertical surface, and the inclination angle formed by each pressure surface and the horizontal surface is set to 2.0 °.

本発明の曲げ工具は、上記各構成により、断面略ハット形又は断面略Ｕ字形の金具を製造する場合、それがアール形状部の曲率半径が異なる複数の種類の金具を製造する場合であっても、簡易な金型構造で、加工の工程を増やすことなしに、金属板を、形状不良を防止しつつ所定の形状に確実かつ容易に曲げ加工することができ、これにより金具の製造コストの低減を図ることができる。 When the bending tool of the present invention manufactures a metal fitting having a substantially hat-shaped cross section or a substantially U-shaped cross section according to each of the above-described configurations, it is a case where a plurality of types of metal fittings having different radiuses of curvature of the round-shaped portions are manufactured. However, with a simple mold structure, it is possible to reliably and easily bend a metal plate into a predetermined shape while preventing shape defects without increasing the number of processing steps. Reduction can be achieved.

以下、この発明の一実施の形態について図を用いて説明する。図１及び図２に示すように、この曲げ工具は、上型１と下型２とより構成される。 Hereinafter, an embodiment of the present invention will be described with reference to the drawings. As shown in FIGS. 1 and 2, the bending tool includes an upper mold 1 and a lower mold 2.

図１に示すように、上型１は、ベンディングマシンに固定される上型本体１１と、この上型本体１１に取り付けられる上型アタッチメントブロック１２と、この上型本体１１に上型アタッチメントブロック１２とともに取り付けられる上型形状ブロック１３とを備えて構成される。 As shown in FIG. 1, the upper mold 1 includes an upper mold main body 11 fixed to a bending machine, an upper mold attachment block 12 attached to the upper mold main body 11, and an upper mold attachment block 12 attached to the upper mold main body 11. And an upper mold shape block 13 attached together.

上型本体１１は垂直方向に延びる垂直方向ブロック１１１とこのブロック１１１の上下方向中央によりも上部側に水平に向けて突出される水平方向ブロック１１２とからなり、上部が断面略Ｌ字形に形成され、その垂直部の所定の位置に複数のボルト挿通穴（不図示）が穿たれて、上部に水平面１１３及び垂直面１１４からなる上型取付面を備え、下部が断面略逆Ｌ字形に形成され、その垂直部１１５の所定の位置に複数のボルト挿通穴１１６が穿たれて、下部に上型アタッチメントブロック１２及び上型形状ブロック１３を固定するための水平ガイド面１１７及び垂直ガイド面１１８を備える。また、この上型本体１１の下端部は下型２に対する加圧面１１９で、下部の垂直ガイド面１１８の下端エッジからこの垂直ガイド面１１８の向きとは反対方向に向けて所定角度θ１の加圧面１１９になっている。この場合、加圧面１１９は垂直ガイド面１１８の下端エッジから当該垂直ガイド面１１８の向きとは反対方向へ上方に向けて傾斜され、この加圧面１１９と水平面とのなす傾斜角θ１は３．５°に設定される。 The upper die body 11 includes a vertical block 111 extending in the vertical direction and a horizontal block 112 projecting horizontally toward the upper side from the vertical center of the block 111, and the upper part is formed in a substantially L-shaped cross section. A plurality of bolt insertion holes (not shown) are formed at predetermined positions in the vertical portion, and an upper die mounting surface including a horizontal surface 113 and a vertical surface 114 is provided at the upper portion, and the lower portion is formed in a substantially inverted L-shaped cross section. A plurality of bolt insertion holes 116 are formed at predetermined positions of the vertical portion 115, and a horizontal guide surface 117 and a vertical guide surface 118 for fixing the upper die attachment block 12 and the upper die shape block 13 are provided at the lower portion. . Further, the lower end portion of the upper die body 11 is a pressure surface 119 for the lower die 2, and the pressure surface at a predetermined angle θ1 from the lower edge of the lower vertical guide surface 118 toward the direction opposite to the direction of the vertical guide surface 118. 119. In this case, the pressure surface 119 is inclined upward from the lower edge of the vertical guide surface 118 in the direction opposite to the direction of the vertical guide surface 118, and the inclination angle θ1 formed by the pressure surface 119 and the horizontal surface is 3.5. Set to °.

上型アタッチメントブロック１２は上型本体１１の下部、すなわち垂直方向ブロック１１１のうち水平方向ブロック１１２より下の部分と概ね同じ形状及び大きさのブロックからなり、上端に水平面１２１が形成され、両側に垂直面１２２、１２２が形成されて、この垂直面１２２、１２２間で上型本体１１の下部の各ボルト挿通穴１１６に対応する位置にそれぞれボルトをねじ締結するためのねじ穴１２３が穿たれる。また、この上型アタッチメントブロック１２には、一方の垂直面１２２の上部側に断面略Ｌ字形の溝１２４が切り欠き形成されて、複数のスペーサ３、３、…が挿入可能になっている。さらに、この上型アタッチメントブロック１２の下端部は下型２に対する加圧面１２５で、上型本体１１の加圧面１１９と同じ高さで対称的に、（溝１２４を有する）一方の垂直面１２２の下端エッジからこの垂直面１２２の向きとは反対方向に向けて所定角度θ１の加圧面１２５になっている。この場合、加圧面１２５は一方の垂直面１２２の下端エッジから他方の垂直面１２２へ上方に向けて傾斜され、この加圧面１２５と水平面とのなす傾斜角θ１は３．５°に設定される。このようにして上型アタッチメントブロック１２は、上端の水平面１２１が上型本体１１の水平ガイド面１１７に当接され、（溝１２４を有する）一方の垂直面１２２が上型本体１１の垂直ガイド面１１８に対向して、上型本体１１に、上型本体１１及び上型アタッチメントブロック１２間の各ボルト挿通穴１１６、各ねじ穴１２３に通されるボルト５１により、着脱可能に固定される。 The upper die attachment block 12 is composed of a block having substantially the same shape and size as the lower portion of the upper die body 11, that is, the vertical block 111 below the horizontal block 112, and a horizontal surface 121 is formed at the upper end, and on both sides. Vertical surfaces 122 and 122 are formed, and screw holes 123 for screwing bolts are formed between the vertical surfaces 122 and 122 at positions corresponding to the respective bolt insertion holes 116 on the lower portion of the upper die main body 11. . In addition, a groove 124 having a substantially L-shaped cross section is formed in the upper die attachment block 12 on the upper side of one vertical surface 122 so that a plurality of spacers 3, 3,... Can be inserted. Further, the lower end portion of the upper die attachment block 12 is a pressurizing surface 125 for the lower die 2 and is symmetrical with the same height as the pressurizing surface 119 of the upper die body 11 and has one vertical surface 122 (having a groove 124). The pressure surface 125 has a predetermined angle θ1 from the lower edge toward the direction opposite to the direction of the vertical surface 122. In this case, the pressure surface 125 is inclined upward from the lower end edge of one vertical surface 122 toward the other vertical surface 122, and the inclination angle θ1 formed by the pressure surface 125 and the horizontal surface is set to 3.5 °. . In this manner, the upper die attachment block 12 has the upper horizontal surface 121 abutted against the horizontal guide surface 117 of the upper die body 11, and one vertical surface 122 (having the groove 124) is the vertical guide surface of the upper die body 11. Opposite to 118, the upper die body 11 is detachably fixed to the upper die body 11 by bolts 51 passed through the bolt insertion holes 116 and the screw holes 123 between the upper die body 11 and the upper die attachment block 12.

上型形状ブロック１３は上型アタッチメントブロック１２と概ね同じ形状を有するブロックで、幅方向は上型アタッチメントブロック１２と略同じ寸法に、高さ方向は上型アタッチメントブロック１２よりも少し大きい寸法に、厚さ方向は製造しようする金具の寸法に合わせて所定の寸法にそれぞれ設定されて、上端に水平面１３１が形成され、両側に垂直面１３２、１３２が形成されて、この垂直面１３２、１３２間で上型本体１１の下部の各ボルト挿通穴１１６に対応する位置に上下に長い長穴状のボルト挿通穴１３３が穿たれる。この上型形状ブロック１３の下端面から両側の垂直面１３２、１３２に回り込む下端部は上型１から突出され下型２の溝２２５に向けて加圧挿入される突出端で、この突出端に所定の断面略Ｕ字形の突状加圧部１３４が形成される。この場合、突状加圧部１３４は所定のアール寸法に、すなわち製造しようする金具ごとに要求される所定の曲率半径のアール形状に形成される。このようにして上型形状ブロック１３は上型本体１１と上型アタッチメントブロック１２との間に挟持されるとともに、上型本体１１の水平ガイド面１１７及び上型形状ブロック１３（の上端）間に複数のスペーサ３が介挿されて、下部の突状加圧部１３４が上型本体１１及び上型アタッチメントブロック１２の各下端加圧面１１９、１２５から下方に向けて所定量だけ突出した状態に組み立てられる。そして、この上型形状ブロック１３は上型本体１１に、上型本体１１、上型形状ブロック１３及び上型アタッチメントブロック１２間の各ボルト挿通穴１１６、１３３、各ねじ穴１２３に通されるボルト５１のねじ締結により、上型アタッチメントブロック１２とともに着脱可能に固定される。 The upper die shape block 13 is a block having substantially the same shape as the upper die attachment block 12, the width direction is substantially the same as the upper die attachment block 12, and the height direction is slightly larger than the upper die attachment block 12. The thickness direction is set to a predetermined size according to the size of the metal fitting to be manufactured, a horizontal surface 131 is formed at the upper end, and vertical surfaces 132 and 132 are formed on both sides. Between the vertical surfaces 132 and 132, A long and long bolt insertion hole 133 is formed at a position corresponding to each bolt insertion hole 116 at the lower portion of the upper mold main body 11. The lower end of the upper mold block 13 that goes from the lower end surface to the vertical surfaces 132 and 132 on both sides is a protruding end that protrudes from the upper mold 1 and is pressed into the groove 225 of the lower mold 2. A protruding pressure part 134 having a predetermined U-shaped cross section is formed. In this case, the protruding pressure part 134 is formed in a predetermined radius size, that is, in a round shape having a predetermined radius of curvature required for each metal fitting to be manufactured. In this way, the upper mold block 13 is sandwiched between the upper mold body 11 and the upper mold attachment block 12, and between the horizontal guide surface 117 of the upper mold body 11 and the upper mold block 13 (the upper end thereof). A plurality of spacers 3 are inserted, and the lower protruding pressure part 134 is assembled in a state in which a predetermined amount protrudes downward from the lower end pressing surfaces 119 and 125 of the upper mold body 11 and the upper mold attachment block 12. It is done. The upper die block 13 is passed through the upper die body 11 through the bolt insert holes 116 and 133 and the screw holes 123 between the upper die body 11, the upper die block 13 and the upper attachment block 12. By fastening the screw 51, the upper attachment block 12 is detachably fixed.

図２に示すように、下型２は、ベンディングマシンに固定される下型本体２１と、この下型本体２１に取り付けられる下型アタッチメントブロック２２とを備えて構成される。 As shown in FIG. 2, the lower mold 2 includes a lower mold main body 21 fixed to a bending machine and a lower mold attachment block 22 attached to the lower mold main body 21.

下型本体２１は断面溝形のブロックで、水平の基部ブロック２１１と、この基部ブロック２１１の両側に立ち上げられた高さの異なる２つの端ブロック２１２、２１３とを備える。基部ブロック２１１の上面は水平に形成される。以下、この上面を水平ガイド面２１４という。一方の端ブロック２１２は他方の端ブロック２１３よりも高く延ばされ、他方の端ブロック２１３に対向する内側面が基部ブロック２１１の水平ガイド面２１４に対して垂直に形成される。以下、この内側面を垂直ガイド面２１５という。この一方の端ブロック２１２の上端部は上型１に対する加圧面２１６で、下端部に比べて厚さが薄く（また、上型本体１１の加圧面１１９よりも厚さが薄く）形成され、垂直ガイド面２１５の上端エッジからこの垂直ガイド面２１５の向きとは反対方向に向けて所定角度θ２の加圧面２１６になっている。この場合、加圧面２１６は垂直ガイド面２１５の上端エッジから当該垂直ガイド面２１５の向きとは反対方向へ上方に向けて傾斜され、この加圧面２１６と水平面とのなす傾斜角θ２は２．０°に設定される。他方の端ブロック２１３は一方の端ブロック２１２に対向する内側面が基部ブロック２１１の水平ガイド面２１４に対して垂直に形成される。以下、この内側面を垂直固定面２１７という。この他方の端ブロック２１３の両側面間で所定の位置に複数のボルト挿通穴２１８が穿たれる。このようにして下型本体２１の上部で、基部ブロック２１１の上面に水平ガイド面２１４、一方の端ブロック２１２の内側面に垂直ガイド面２１５、さらに、他方の端ブロック２１３の内側面に垂直固定面２１７が形成される。 The lower mold main body 21 is a block having a cross-sectional groove shape, and includes a horizontal base block 211 and two end blocks 212 and 213 raised on both sides of the base block 211 and having different heights. The upper surface of the base block 211 is formed horizontally. Hereinafter, this upper surface is referred to as a horizontal guide surface 214. One end block 212 extends higher than the other end block 213, and an inner surface facing the other end block 213 is formed perpendicular to the horizontal guide surface 214 of the base block 211. Hereinafter, this inner surface is referred to as a vertical guide surface 215. The upper end portion of the one end block 212 is a pressing surface 216 for the upper die 1 and is formed thinner than the lower end portion (and thinner than the pressing surface 119 of the upper die body 11), and is vertical. The pressure surface 216 has a predetermined angle θ2 from the upper end edge of the guide surface 215 in the direction opposite to the direction of the vertical guide surface 215. In this case, the pressure surface 216 is inclined upward from the upper edge of the vertical guide surface 215 in the direction opposite to the direction of the vertical guide surface 215, and the inclination angle θ2 formed by the pressure surface 216 and the horizontal plane is 2.0. Set to °. The other end block 213 is formed such that the inner surface facing the one end block 212 is perpendicular to the horizontal guide surface 214 of the base block 211. Hereinafter, this inner surface is referred to as a vertical fixing surface 217. A plurality of bolt insertion holes 218 are formed at predetermined positions between both side surfaces of the other end block 213. In this way, at the upper part of the lower die main body 21, the horizontal guide surface 214 is fixed to the upper surface of the base block 211, the vertical guide surface 215 is fixed to the inner surface of one end block 212, and the inner surface of the other end block 213 is fixed vertically. A surface 217 is formed.

下型アタッチメントブロック２２は、下型本体２１の一方の端ブロック２１２と対称的な形状及び大きさを有するブロックで、下端が水平面２２１で、一側面に垂直面２２２が形成され、両側面間で下型本体２１の他方の端ブロック２１３の各ボルト挿通穴２１８に対応する位置にそれぞれボルトをねじ締結するためのねじ穴２２３が穿たれる。この下型アタッチメントブロック２２の上端部は上型１に対する加圧面２２４で、この上端部は下型本体２１の一方の端ブロック２１２の上端部と同じ高さで、この端ブロック２１２と同様に、下端部に比べて厚さが薄く（また、上型アタッチメントブロック１２の加圧面１２５よりも厚さが薄く）形成され、垂直面２２２の上端エッジからこの垂直面２２２の向きとは反対方向に向けて所定角度θ２の加圧面２２４になっている。この場合、加圧面２２４は垂直面２２２の上端エッジから当該垂直面２２２の向きとは反対方向へ上方に向けて傾斜され、この加圧面２２２と水平面とのなす傾斜角θ２は２．０°に設定される。このようにして下型アタッチメントブロック２２は、下端水平面２２１が下型本体２１の水平ガイド面２１４に当接し、この下型アタッチメントブロック２２の垂直面２２２と下型本体２１の垂直ガイド面２１５が相互に対向する状態で、下型本体２１上に設置され、併せてこの垂直面２２２と垂直ガイド面２１５との間に製造しようとする金具の寸法に合わせて所定の間隔の溝２２５を形成し、この下型アタッチメントブロック２２の（垂直面２２２とは反対側の）他側面と下型本体２１の垂直固定面２１７との間に複数のスペーサ４が介在設置される。なお、これらのスペーサ４には下型本体２１の他方の端ブロック２１３の各ボルト挿通穴２１８に対応する複数のボルト挿通穴４０が穿たれる。そして、この下型アタッチメントブロック２２は下型本体２１に、下型本体２１、スペーサ４、及び下型アタッチメントブロック２２間の各ボルト挿通穴２１８、４０、各ねじ穴２２３に通されるボルト５３のねじ締結により、着脱可能に固定される。 The lower die attachment block 22 is a block having a shape and a size symmetrical to one end block 212 of the lower die main body 21. The lower end is a horizontal plane 221, and a vertical surface 222 is formed on one side surface. Screw holes 223 for screwing bolts are formed at positions corresponding to the respective bolt insertion holes 218 of the other end block 213 of the lower mold body 21. The upper end portion of the lower die attachment block 22 is a pressure surface 224 for the upper die 1, and the upper end portion is the same height as the upper end portion of one end block 212 of the lower die main body 21, and similarly to the end block 212, The thickness is smaller than the lower end (and thinner than the pressure surface 125 of the upper attachment block 12), and the direction from the upper edge of the vertical surface 222 to the direction opposite to the vertical surface 222 is directed. The pressure surface 224 has a predetermined angle θ2. In this case, the pressure surface 224 is inclined upward from the upper edge of the vertical surface 222 in the direction opposite to the direction of the vertical surface 222, and the inclination angle θ2 formed by the pressure surface 222 and the horizontal surface is 2.0 °. Is set. In this way, the lower die attachment block 22 has the lower end horizontal surface 221 abutting against the horizontal guide surface 214 of the lower die body 21, and the vertical surface 222 of the lower die attachment block 22 and the vertical guide surface 215 of the lower die body 21 are mutually connected. Are formed on the lower die main body 21 and, at the same time, a groove 225 having a predetermined interval is formed between the vertical surface 222 and the vertical guide surface 215 according to the size of the metal fitting to be manufactured, A plurality of spacers 4 are interposed between the other side surface of the lower die attachment block 22 (on the side opposite to the vertical surface 222) and the vertical fixing surface 217 of the lower die body 21. A plurality of bolt insertion holes 40 corresponding to the respective bolt insertion holes 218 of the other end block 213 of the lower mold body 21 are formed in these spacers 4. The lower die attachment block 22 includes a bolt 53 inserted into the lower die body 21, the bolt insertion holes 218 and 40 between the lower die body 21, the spacer 4, and the lower die attachment block 22, and the screw holes 223. It is detachably fixed by screw fastening.

このように上型１は３分割部品で構成され、下型２は２分割部品で構成され、ベンディングマシンによって金属板を所定の断面略ハット形に折り曲げ加工する場合に、図３に示すように、上型１が上型本体１１、上型アタッチメントブロック１２、及び突状加圧部１３４に製造しようとする断面略ハット形の金具の内寸（金具の両側内側面間の寸法）に相当する厚さと所定の曲率半径のアール形状を有する上型形状ブロック１３により組み立てられ、上型形状ブロック１３下部の突状加圧部１３４が上型本体１１及び上型アタッチメントブロック１２の各下端加圧面１１９、１２５から下方に向けて所定量だけ突出された状態で、ベンディングマシン６のスライダ６１の下端部にボルトその他の取付金具により固定して装着され、下型２が下型本体２１及び下型アタッチメントブロック２２により組み立てられ、下型本体２１の垂直ガイド面２１５と下型アタッチメントブロック２２の垂直面２２２との間に、製造しようとする断面略ハット形の金具の外寸（金具の両側外側面間の寸法）に相当する所定間隔の溝２２５が形成されて、ベンディングマシン６のベッド６２にボルトその他の取付金具により固定して装着される。 As shown in FIG. 3, when the upper mold 1 is composed of three divided parts and the lower mold 2 is composed of two divided parts, a metal plate is bent into a predetermined hat shape by a bending machine as shown in FIG. The upper die 1 corresponds to the inner dimension of the metal fitting having a substantially hat-shaped cross section to be manufactured on the upper die body 11, the upper die attachment block 12, and the protruding pressure part 134 (the dimension between the inner side surfaces on both sides of the metal fitting). The upper pressing block 134 is assembled by the upper mold block 13 having a round shape having a thickness and a predetermined radius of curvature, and the protruding pressurizing portions 134 at the lower part of the upper mold block 13 are respectively pressed at the lower ends of the upper mold main body 11 and the upper mold attachment block 12. The lower die 2 is fixedly attached to the lower end of the slider 61 of the bending machine 6 with bolts or other mounting brackets, with a predetermined amount projecting downward from 125. An outer dimension of a metal fitting having a substantially hat-shaped cross section to be manufactured between the vertical guide surface 215 of the lower mold main body 21 and the vertical surface 222 of the lower mold attachment block 22, which is assembled by the main body 21 and the lower mold attachment block 22. Grooves 225 having a predetermined interval corresponding to the dimension between the outer side surfaces of the metal fittings are formed, and are fixedly attached to the bed 62 of the bending machine 6 with bolts or other fittings.

そして、金属板７を曲げ加工する際に、金属板７を下型本体２１の一方の端ブロック２１２の上端部と下型アタッチメントブロック２２の上端部との間に架け渡して下型２の上に載せ、金属板７を位置決めした後、上型１を下降して、断面略Ｕ字形の突状加圧部１３４を金属板７の上から下型２の溝２２５に加圧挿入する。これにより、金属板７の両端が上型１の上型本体１１下端の加圧面１１９及び上型アタッチメントブロック１２下端の加圧面１２５と下型２の下型本体２１上端の加圧面２１６及び下型アタッチメントブロック２２上端の加圧面２２４とにより加圧挟持されて、金属板７の中間面が上型１の上型形状ブロック１３下端の突状加圧部１３４とともに下型２の溝２２５に加圧挿入されると同時に、突状加圧部１３４の外形に沿ってアール曲げ加工され、断面略ハット形に成形される。このとき、金属板７の両端が上型１の上型本体１１下端の傾斜角３．５°の加圧面１１９及び上型アタッチメントブロック１２下端の傾斜角３．５°の加圧面１２５と下型２の下型本体２１上端の傾斜角２．０°の加圧面２１６及び下型アタッチメントブロック２２上端の傾斜角２．０°の加圧面２２４とにより少し遊びを持たせて加圧挟持されたことで、金属板７の両端に対する上型１及び下型２の加圧角度及び加圧力が最適な状態に調整され、この上下型１、２から取り出された金具はスプリングバックにより戻り変形するが、このスプリングバックにより両側面が平行に、両端のフランジが両側面に対して直角に変形調整され、これが永久変形の形状をなす。 When bending the metal plate 7, the metal plate 7 is bridged between the upper end portion of one end block 212 of the lower die body 21 and the upper end portion of the lower die attachment block 22, and After the metal plate 7 is positioned, the upper die 1 is lowered, and the protruding pressure part 134 having a substantially U-shaped cross section is pressure inserted into the groove 225 of the lower die 2 from above the metal plate 7. Thereby, both ends of the metal plate 7 are the pressing surface 119 at the lower end of the upper mold body 11 and the pressing surface 125 at the lower end of the upper mold attachment block 12 and the pressing surface 216 at the upper end of the lower mold body 21 of the lower mold 2 and the lower mold. The intermediate surface of the metal plate 7 is pressed against the groove 225 of the lower die 2 together with the projecting pressure portion 134 at the lower end of the upper die block 13 of the upper die 1 by being sandwiched by the pressure surface 224 at the upper end of the attachment block 22. At the same time as being inserted, it is rounded along the outer shape of the protruding pressure part 134 and formed into a substantially hat-shaped cross section. At this time, both ends of the metal plate 7 have a pressure surface 119 with an inclination angle of 3.5 ° at the lower end of the upper die body 11 of the upper die 1 and a pressure surface 125 with an inclination angle of 3.5 ° at the lower end of the upper attachment block 12 and the lower die. 2 was pressed between the pressure surface 216 with an inclination angle of 2.0 ° at the upper end of the lower mold body 21 and the pressure surface 224 with an inclination angle of 2.0 ° at the upper end of the lower mold attachment block 22 with a little play. Thus, the pressurization angle and pressure of the upper mold 1 and the lower mold 2 with respect to both ends of the metal plate 7 are adjusted to the optimum state, and the metal fittings taken out from the upper and lower molds 1 and 2 are deformed by spring back, By this spring back, both side surfaces are parallel and both end flanges are deformed and adjusted at right angles to both side surfaces, which forms a permanent deformation shape.

以上説明したように、この曲げ工具では、上型１が、下端に所定角度の加圧面１１９を有する上型本体１１、下端に所定角度の加圧面１２５を有する上型アタッチメントブロック１２、これら上型本体１１と上型アタッチメントブロック１２との間に挟持され、上型本体１１に上型アタッチメントブロック１２とともに固定される上型形状ブロック１３、の３分割部品により構成され、これら上型本体１１、上型アタッチメントブロック１２、及び上型形状ブロック１３が組み立てられ、上型形状ブロック１３の突状加圧部１３４が断面略ハット形の金具の内寸（金具の両側内側面間の寸法）に相当する厚さと所定の曲率半径のアール形状を有し、上型本体１１及び上型アタッチメントブロック１２の各下端加圧面１１９、１２５から下方に向けて所定量だけ突出されて、ベンディングマシン６のスライド６１に取付金具により固定して装着され、一方、下型２が、上端に所定角度の加圧面２１６を有する下型本体２１、上端に所定角度の加圧面２２４を有する下型アタッチメントブロック２２、の２分割部品により構成され、これら下型本体２１及び下型アタッチメントブロック２２により組み立てられ、下型本体２１の垂直ガイド面２１５と下型アタッチメントブロック２２の垂直面２２２との間に、断面略ハット形の金具の外寸（金具の両側外側面間の寸法）に相当する所定間隔の溝２２５が形成されて、ベンディングマシン６のベッド６２に取付金具により固定して装着されるので、金属板を、簡易な金型構造で、加工工程を増やすことなしに、所定の形状に確実かつ容易に曲げ加工することができ、所望の金具を低コストに製造することができる。また、アール形状部の曲率半径が異なる金具をさらに製造する場合でも、上型形状ブロック１３のみを製作し、しかも下端の突状加圧部１３４を所定の形状に形成すればよく、簡易な金型により、所望の金具を低コストに製造することができる。 As described above, in this bending tool, the upper mold 1 includes the upper mold body 11 having the pressing surface 119 having a predetermined angle at the lower end, the upper mold attachment block 12 having the pressing surface 125 having the predetermined angle at the lower end, and these upper molds. The upper mold body 11 is composed of three divided parts, which are sandwiched between the main body 11 and the upper mold attachment block 12 and are fixed to the upper mold main body 11 together with the upper mold attachment block 12. The mold attachment block 12 and the upper mold shape block 13 are assembled, and the protruding pressure part 134 of the upper mold shape block 13 corresponds to the inner dimension of the metal fitting having a substantially hat-shaped cross section (the dimension between the inner side surfaces of the metal fitting). It has a round shape with a thickness and a predetermined radius of curvature, and is downward from the lower end pressing surfaces 119 and 125 of the upper die body 11 and the upper die attachment block 12. The lower die 2 is protruded by a predetermined amount and fixedly attached to the slide 61 of the bending machine 6 with a mounting bracket. On the other hand, the lower die 2 has a pressing surface 216 having a predetermined angle at the upper end, and the upper end is predetermined. The lower die attachment block 22 having an angle pressing surface 224 is composed of two divided parts, and is assembled by the lower die main body 21 and the lower die attachment block 22, and the vertical guide surface 215 of the lower die main body 21 and the lower die attachment block are assembled. A groove 225 having a predetermined interval corresponding to the outer dimension of the metal fitting having a substantially hat-shaped cross section (dimension between the outer side surfaces of the metal fitting) is formed between the vertical surface 222 and the vertical surface 222 of the bending machine 6 and attached to the bed 62 of the bending machine 6. Since it is fixed and attached by metal fittings, the metal plate can be reliably and easily formed into a predetermined shape with a simple mold structure and without increasing the number of processing steps. Bending can be processed, it is possible to produce the desired metal in a low cost. Even when a metal fitting having a different radius of curvature of the round shape portion is further manufactured, only the upper mold shape block 13 is manufactured, and the protruding pressure portion 134 at the lower end may be formed in a predetermined shape. With the mold, a desired metal fitting can be manufactured at low cost.

そして、この曲げ工具では、上型１の、上型本体１１の垂直ガイド面１１８と上型アタッチメントブロック１２との間で上型本体１１の水平ガイド面１１７及び上型形状ブロック１３間に複数のスペーサ３が介挿され、これら上型本体１１、上型形状ブロック１３、及び上型アタッチメントブロック１２間にボルト挿通穴１１６、１３３、ねじ穴１２３が形成されて、これらボルト挿通穴１１６、１３３、ねじ穴１２３にボルト５１が通されてねじ締結されるので、これら上型本体１１、上型形状ブロック１３、及び上型アタッチメントブロック１２の組み立てが容易で、かつ上型形状ブロック１３の下端突状加圧部１３４の突出量を簡易に調整することができる。 In this bending tool, a plurality of upper guides 1 between the vertical guide surface 118 of the upper tool body 11 and the upper tool attachment block 12 between the horizontal guide surface 117 of the upper tool body 11 and the upper tool block 13. Spacers 3 are inserted, and bolt insertion holes 116 and 133 and screw holes 123 are formed between the upper die main body 11, the upper die shape block 13, and the upper die attachment block 12, and these bolt insertion holes 116 and 133, Since the bolt 51 is passed through the screw hole 123 and screwed, the upper die main body 11, the upper die shape block 13, and the upper die attachment block 12 can be easily assembled, and the lower end protruding shape of the upper die shape block 13 can be obtained. The amount of protrusion of the pressure unit 134 can be easily adjusted.

また、この曲げ工具では、下型２の下型本体２１に垂直ガイド面２１５に対向して所定の間隔で垂直固定面２１７が並設され、この垂直固定面２１７と下型アタッチメントブロック２２との間に複数のスペーサ４が介在設置され、これら垂直固定面２１７、スペーサ４、及び下型アタッチメントブロック２２間にボルト挿通穴２１８、４０、ねじ穴２２３が形成されて、これらボルト挿通穴２１８、４０、ねじ穴２２３にボルト５３が通されてねじ締結されるので、これら下型本体２１及び下型アタッチメントブロック２２の組み立てが容易で、かつ下型本体２１の垂直ガイド面２１５と下型アタッチメントブロック２２の垂直面２２２との間に、断面略ハット形の金具の外寸（金具の両側外側面間の寸法）に相当する所定間隔の溝２２５を簡易に形成することができる。なお、この溝２２５は、図２、図３に破線で示すように、必要に応じて、水平ガイド面２１４にさらに溝を形成することで、深さ方向を延ばすことができ、溝２２５の深さが調整可能である。 Further, in this bending tool, a vertical fixing surface 217 is arranged in parallel at a predetermined interval on the lower die body 21 of the lower die 2 so as to face the vertical guide surface 215, and the vertical fixing surface 217 and the lower die attachment block 22 are arranged. A plurality of spacers 4 are interposed therebetween, and bolt insertion holes 218 and 40 and screw holes 223 are formed between the vertical fixing surface 217, the spacer 4, and the lower die attachment block 22, and these bolt insertion holes 218 and 40 are formed. Since the bolt 53 is passed through the screw hole 223 and screwed, the lower die body 21 and the lower die attachment block 22 can be easily assembled, and the vertical guide surface 215 and the lower die attachment block 22 of the lower die body 21 are assembled. A groove 225 having a predetermined interval corresponding to the outer dimension of the metal fitting having a substantially hat-shaped cross section (the dimension between the outer side surfaces on both sides of the metal fitting) is formed between the vertical surface 222 and the vertical surface 222. It can be formed on the easy. 2 and 3, the groove 225 can be extended in the depth direction by further forming a groove in the horizontal guide surface 214 as necessary. Is adjustable.

さらに、この曲げ工具では、上型１の、上型本体１１の加圧面１１９は上型本体１１の垂直ガイド面１１８の下端エッジから当該垂直ガイド面１１８の向きとは反対方向へ上方に向けて傾斜され、上型アタッチメントブロック１２の加圧面１２５は上型アタッチメントブロック１２の垂直面１２２の下端エッジから当該垂直面１２２の向きとは反対方向へ上方に向けて傾斜され、当該各加圧面１１９、１２５と水平面とのなす傾斜角は３．５°に設定され、他方、下型２の、下型本体２１の加圧面２１６は下型本体２１の垂直ガイド面２１５の上端エッジから当該垂直ガイド面２１５の向きとは反対方向へ上方に向けて傾斜され、下型アタッチメントブロック２２の加圧面２２４は下型アタッチメントブロック２２の垂直面２２２の上端エッジから当該垂直面２２２の向きとは反対方向へ上方に向けて傾斜され、当該各加圧面２１６、２２４と水平面とのなす傾斜角は２．０°に設定されて、金属板の両端に対して上型１及び下型２の加圧角度及び加圧力が最適な状態に調整されるので、この上下型１、２から取り出された金具をそのスプリングバックを利用して、両側面を平行に、両端のフランジを両側面に対して直角に調整変形することができるなど、金具の形状不良を防止しつつ所定の形状に確実かつ容易に曲げ加工することができる。そして、以上により、金具の製造コストの大幅な削減を図ることができる。 Further, in this bending tool, the pressing surface 119 of the upper mold body 11 of the upper mold 1 is directed upward from the lower edge of the vertical guide surface 118 of the upper mold body 11 in the direction opposite to the direction of the vertical guide surface 118. The pressure surface 125 of the upper die attachment block 12 is tilted upward from the lower end edge of the vertical surface 122 of the upper die attachment block 12 in the direction opposite to the direction of the vertical surface 122, and the pressure surfaces 119, The inclination angle formed by 125 and the horizontal plane is set to 3.5 °. On the other hand, the pressing surface 216 of the lower mold body 21 of the lower mold 2 extends from the upper edge of the vertical guide surface 215 of the lower mold body 21 to the vertical guide surface. The pressure surface 224 of the lower mold attachment block 22 is inclined upward in the direction opposite to the direction of the 215, and the upper end edge of the vertical surface 222 of the lower mold attachment block 22 is Is inclined upward in the direction opposite to the direction of the vertical surface 222, and the inclination angle formed by the pressure surfaces 216 and 224 and the horizontal plane is set to 2.0 ° with respect to both ends of the metal plate Since the pressurization angle and the applied pressure of the upper mold 1 and the lower mold 2 are adjusted to the optimum state, the metal parts taken out from the upper and lower molds 1 and 2 are made parallel to both sides using the spring back. For example, the flanges at both ends can be adjusted and deformed at right angles to both side surfaces, so that the metal fitting can be reliably and easily bent into a predetermined shape while preventing a defective shape of the metal fitting. As described above, the manufacturing cost of the metal fitting can be greatly reduced.

なお、上記実施の形態では、上型本体１１下端の加圧面１１９と、上型アタッチメントブロック１２下端の加圧面１２５と、上型形状ブロック１３下端の突状加圧部１３４とにより、上型１の加圧面を構成し、上型形状ブロック１３の突状加圧部１３４を断面略Ｕ字形に、すなわち所定の曲率半径のアール形状に形成して、金属板を所定のアール寸法に曲げ加工するようにしたが、この突状加圧部１３４のアール形状の曲率半径を僅かに変更する場合は、突状加圧部１３４の先端に金属チップからなる所定の曲率半径を有するアール形状部材を接着材などを介して着脱可能に固定することで、突状加圧部１３４の先端に必要なアールを付けることができ、このようにしても金属板を所定の曲率半径にアール曲げ加工することができる。したがって、この曲げ工具に、曲率半径の異なる複数のアール形状部材を併せて備えることで、１つの上型形状ブロック１３の突状加圧部１３４の先端に多種多様な曲率のアール形状を付けることができる。また、この上型形状ブロック１３を、突状加圧部１３４が断面略コ字形に形成されたブロックに代えることで、金属板をコ字形に曲げ加工することができ、突状加圧部１３４が断面略Ｖ字形に形成されたブロックに代えることで、金属板をＶ字形に曲げ加工することができるなど、突状加圧部１３４の断面形状を種々に変更することにより、金属板を種々の形状に曲げ加工することができる。 In the above embodiment, the upper die 1 is constituted by the pressure surface 119 at the lower end of the upper die main body 11, the pressure surface 125 at the lower end of the upper die attachment block 12, and the protruding pressure part 134 at the lower end of the upper die shape block 13. And the protruding pressure part 134 of the upper mold block 13 is formed into a substantially U-shaped cross section, that is, a rounded shape with a predetermined radius of curvature, and the metal plate is bent to a predetermined rounded dimension. However, when the radius of curvature of the projecting pressure portion 134 is slightly changed, a radius member having a predetermined radius of curvature made of a metal chip is bonded to the tip of the projecting pressure portion 134. By fixing so as to be detachable through a material or the like, it is possible to attach the required rounding to the tip of the projecting pressure portion 134, and even in this way, the metal plate can be rounded to a predetermined radius of curvature. it can. Therefore, the bending tool is provided with a plurality of round-shaped members having different curvature radii, thereby attaching round shapes having various curvatures to the tips of the protruding pressure portions 134 of one upper mold-shaped block 13. Can do. In addition, the metal plate can be bent into a U-shape by replacing the upper die-shaped block 13 with a block in which the protruding pressure portion 134 has a substantially U-shaped cross section, and the protruding pressure portion 134 can be bent. By changing the cross-sectional shape of the projecting pressure portion 134 in various ways, such as by bending the metal plate into a V-shape by replacing the block with a substantially V-shaped cross section, various metal plates can be obtained. It can be bent into the shape.

また、上記実施の形態では、一つの金属板を一つの断面略ハット形に曲げ加工するものとして例示したが、プレス加工機械に送り装置を併設し、この送り装置で長い金属板を下型上に間欠的に送り出し、この送りに併せて上型を下型に向けて下降すれば、長い金属板に一定の間隔で複数の断面略Ｕ字形又は断面略コ字形に曲げ加工することができる。この送り装置には例えばソレノイドなどを用いることができる。 In the above-described embodiment, one metal plate is illustrated as being bent into one hat having a substantially cross-sectional shape. However, a feeding device is provided in the press machine, and a long metal plate is placed on the lower mold with this feeding device. If the upper die is lowered toward the lower die at the same time as the feeding, the long metal plate can be bent into a plurality of substantially U-shaped cross sections or substantially U-shaped cross sections at regular intervals. For example, a solenoid or the like can be used for the feeding device.

本発明の一実施の形態におけるプレス曲げ加工用工具の特に上型を示す側面図The side view which shows especially the upper mold | type of the tool for press bending in one embodiment of this invention 同曲げ加工用工具の特に下型を示す側面図Side view showing the lower die of the bending tool 同曲げ加工用工具がベンディングマシンに装着され、金属板を曲げ加工する状態を示す側面図Side view showing the bending tool mounted on a bending machine and bending a metal plate

Explanation of symbols

１上型
１１上型本体
１１１垂直方向ブロック
１１２水平方向ブロック
１１３水平面
１１４垂直面
１１５垂直部
１１６ボルト挿通穴
１１７水平ガイド面
１１８垂直ガイド面
１１９加圧面
１２上型アタッチメントブロック（上型アタッチメント）
１２１水平面
１２２垂直面
１２３ねじ穴
１２４溝
１２５加圧面
１３上型形状ブロック（上型形状部材）
１３１水平面
１３２垂直面
１３３ボルト挿通穴
１３４突状加圧部
２下型
２１下型本体
２１１基部ブロック
２１２端ブロック
２１３端ブロック
２１４水平ガイド面
２１５垂直ガイド面
２１６加圧面
２１７垂直固定面
２１８ボルト挿通穴
２２下型アタッチメントブロック（下型アタッチメント）
２２１水平面
２２２垂直面
２２３ねじ穴
２２４加圧面
２２５溝
３スペーサ
４スペーサ
４０ボルト挿通穴
５１ボルト
５３ボルト
６ベンディングマシン
６１スライド
６２ベッド
７金属板 DESCRIPTION OF SYMBOLS 1 Upper mold | type 11 Upper mold | type main body 111 Vertical direction block 112 Horizontal direction block 113 Horizontal surface 114 Vertical surface 115 Vertical part 116 Bolt insertion hole 117 Horizontal guide surface 118 Vertical guide surface 119 Pressure surface 12 Upper mold | type attachment block (Upper type attachment)
121 Horizontal surface 122 Vertical surface 123 Screw hole 124 Groove 125 Pressure surface 13 Upper die shape block (upper die shape member)
131 Horizontal surface 132 Vertical surface 133 Bolt insertion hole 134 Protruding pressure part 2 Lower mold 21 Lower mold body 211 Base block 212 End block 213 End block 214 Horizontal guide surface 215 Vertical guide surface 216 Pressure surface 217 Vertical fixing surface 218 Bolt insertion hole 22 Lower attachment block (lower attachment)
221 Horizontal surface 222 Vertical surface 223 Screw hole 224 Pressure surface 225 Groove 3 Spacer 4 Spacer 40 Bolt insertion hole 51 Bolt 53 Bolt 6 Bending machine 61 Slide 62 Bed 7 Metal plate

Claims

In a press bending tool that includes an upper die and a lower die and is mounted on a press machine to bend a metal plate into a substantially hat-shaped cross-sectional shape.
The upper mold is
An upper mold main body having a horizontal guide surface and a vertical guide surface at the lower part, and having a pressure surface of a predetermined angle from the lower end edge of the vertical guide surface in a direction opposite to the direction of the vertical guide surface;
It has a horizontal surface at the upper end and a vertical surface on one side, a pressing surface at a predetermined angle from the lower edge of the vertical surface to the direction opposite to the direction of the vertical surface, and the upper end is the horizontal surface of the upper mold body. An upper die attachment that is in contact with a guide surface, the one side surface being opposed to the vertical guide surface of the upper die body, and detachably fixed to the upper die body;
It is clamped between the upper mold main body and the upper mold attachment, is fixed to the upper mold main body together with the upper mold attachment, and protrudes downward from the respective lower pressure surfaces of the upper mold main body and the upper mold attachment. And an upper mold shape member
A projecting pressure portion having a predetermined cross-sectional shape is formed at the projecting end of the upper mold-shaped member,
The lower mold is
A lower die main body having a horizontal guide surface and a vertical guide surface at the top, and having a pressing surface at a predetermined angle from the upper end edge of the vertical guide surface in a direction opposite to the vertical guide surface;
It has a horizontal surface at the lower end, a vertical surface on one side, a pressing surface at a predetermined angle from the upper edge of the vertical surface in the direction opposite to the vertical surface, and the lower end is a horizontal guide surface of the lower mold body A lower mold attachment that is detachably fixed to the lower mold body, with the vertical surface facing the vertical guide surface of the lower mold body,
Between the vertical guide surface of the lower mold body and the vertical surface of the lower mold attachment, a groove is formed in which the upper mold-shaped member of the upper mold body is pressure-inserted ,
The pressure surface of the upper mold body is inclined upward from the lower edge of the vertical guide surface of the upper mold body in the direction opposite to the direction of the vertical guide surface, and the pressure surface of the upper mold attachment is Inclined upward from the lower end edge of the vertical surface of the mold attachment in the direction opposite to the direction of the vertical surface, and the inclination angle formed by each pressure surface and the horizontal surface is set to 3.5 °, while the lower mold The pressure surface of the lower mold body is inclined upward from the upper edge of the vertical guide surface of the lower mold body in the direction opposite to the direction of the vertical guide surface, and the pressure surface of the lower mold attachment is the lower mold attachment Inclined upward from the upper edge of the vertical surface in the direction opposite to the direction of the vertical surface, and the inclination angle formed by each pressure surface and the horizontal plane is set to 2.0 °.
This is a tool for press bending.

A spacer is interposed between the vertical guide surface of the upper mold body of the upper mold and the upper mold attachment between the horizontal guide surface of the upper mold body and the upper mold shape member, and the upper mold body, the upper mold shape member, and The tool for press bending according to claim 1, wherein a screw-through hole is formed between the upper die attachments, and a bolt is passed through the screw-through hole to be screwed.

The press-bending tool according to claim 1 or 2, wherein the protruding pressurizing portion of the upper mold member of the upper mold is formed in a substantially U-shaped cross section or a substantially U-shaped cross section.

The tool for press bending according to any one of claims 1 to 3, further comprising a plurality of round-shaped members having different radii of curvature that can be attached to and detached from the tip of the protruding pressure portion of the upper mold-shaped member of the upper mold.

The lower die body has a vertical fixing surface arranged in parallel at a predetermined interval facing the vertical guide surface, and a spacer is interposed between the vertical fixing surface and the lower die attachment, and these vertical fixing surface, spacer, The press bending tool according to any one of claims 1 to 4, wherein a screw through hole is formed between the lower die attachment and a bolt is passed through the screw through hole to be screwed.