JP2014226683A - Bend processing method of plate - Google Patents
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Abstract
Description
本発明は、金属製板材または金属を含む複合材からなる板材の曲げ加工方法に関するものである。 The present invention relates to a method for bending a plate made of a metal plate or a composite material containing a metal.
自動車、家電、機械業界などでは、金属材(多くは鋼材)の軽量化や素材のコスト低減などに対する活動が展開されている。
ここで、軽量化という点を考えると、板材部品の薄肉化に伴い、強度が高い金属板の加工技術の向上が望まれる。しかしながら、ハイテン材などでは降伏点が高いため、降伏点が低い材料に比べ、相対的に塑性変形し難くかつ弾性変形しやすいため、成形プレスの除荷後に、板材の変形が初期形状に戻りやすい。これは、いわゆるスプリングバックと呼ばれている現象で、最終部品や、製品の形状が、狙いの形状に対して大きくずれてしまう問題として、板材の板厚や材料が変更されるたびに顕在化する場合があって、板厚や材料を変更するときや、板厚の変動や材質が混在するときなどに、所定の加工精度を得ようとすると、十分な設備調整が必要となる。
In the automobile, home appliance, machine industry, and the like, activities for reducing the weight of metal materials (mostly steel materials) and reducing the cost of materials are being developed.
Here, considering the point of weight reduction, it is desired to improve the processing technology of a metal plate having high strength as the plate material part becomes thinner. However, high tensile strength materials, etc., have a high yield point, so they are relatively difficult to be plastically deformed and easily elastically deformed compared to materials with a low yield point. . This is a phenomenon called so-called springback. As the problem that the shape of the final part or product deviates greatly from the target shape, it becomes apparent every time the plate thickness or material is changed. In order to obtain a predetermined processing accuracy when changing the plate thickness or material, or when fluctuations in the plate thickness or materials are mixed, sufficient equipment adjustment is required.
スプリングバックの対策については、解析による予測や操業の改善によるアプローチがなされているものの、詳細な応力ひずみ曲線の取得や、材質、板厚のバラツキまで考慮した検討が必要となるために、現場で事前に予測し、操業条件等を適正化するのは困難である。 Although measures against springback have been approached by analysis prediction and operational improvements, it is necessary to acquire detailed stress-strain curves and to consider material and plate thickness variations. It is difficult to predict in advance and optimize operating conditions.
また、仮に、適正化できたにしても、多種の条件で操業する際には、板厚などの条件の切替えに対応して、頻繁に細かく設備の設定を変更する必要があり、条件変更に多くの時間を消費することとなる結果、効率的な操業が阻害されてしまう。 Also, even if it can be optimized, when operating under various conditions, it is necessary to frequently change the equipment settings in response to switching of conditions such as plate thickness. As a result of consuming a lot of time, efficient operation is hindered.
従って、一般に、絞り加工や曲げ加工では、薄肉化や高強度材への変更に伴って、寸法精度の確保が難しくなる傾向にある。
このような現状から、スプリングバックの抑制や、曲げ加工部の疲労強度の向上など、さまざまな特性、および加工技術の向上が要求されているが、これらの要求に対して、以下に述べるような技術情報が公開されている。
Accordingly, in general, drawing and bending tend to make it difficult to ensure dimensional accuracy as the thickness is reduced or the material is changed to a high-strength material.
From such a current situation, various characteristics such as suppression of springback and improvement of fatigue strength of the bent portion and improvement of processing technology are required. In response to these requirements, as described below. Technical information is publicly available.
例えば、特許文献１には、プレス加工方法において，コイル材の２箇所をクランプして予ひずみを与えるように引張り、次に、クランプを解除して切断機によって所定長さのブランク材に切断したのち、上記ブランク材にてプレス加工を行うプレス加工方法が提案されている。 For example, in Patent Document 1, in a press working method, two portions of a coil material are clamped and pulled so as to give a pre-strain, and then the clamp is released and cut into a blank material of a predetermined length by a cutting machine. After that, there has been proposed a press working method in which the blank material is pressed.
しかしながら、特許文献１に記載された方法では、板の切断とプレスが同じラインである必要があって、適用設備が厳しく制限され、既存の設備への追加や、改造などが極めて難しいという問題があった。また、スキンパスを含む圧延などと異なり、ラインを停止してクランプしつつ、同時に引張りを行う必要があるため、作業性の低下が避けられず、コストアップにつながってしまうという問題がある。
加えて、板をクランプして引っ張るために、板表面に疵が入り易い、あるいは形状が悪い鋼板などでは、正確にクランプした状態を維持するのが難しいという問題もある。
However, in the method described in Patent Document 1, it is necessary that the cutting of the plate and the press be in the same line, and the equipment to be applied is severely limited, and it is very difficult to add to the existing equipment or to modify it. there were. In addition, unlike rolling including a skin pass, it is necessary to perform tension while simultaneously stopping and clamping the line, so that there is a problem that workability is inevitably deteriorated and the cost is increased.
In addition, since the plate is clamped and pulled, there is a problem that it is difficult to maintain the state of being accurately clamped with a steel plate or the like that is likely to have wrinkles on the plate surface or has a poor shape.
本発明は、上記した現状に鑑み開発されたもので、難しい設備改造をせずとも、精度の高い鋼板の折り曲げ加工ができると共に、板表面には疵をいれずに、また形状が悪い鋼板であっても、所定の形状を得ることができる曲げ加工方法を提供することを目的とする。 The present invention has been developed in view of the above-described present situation, and can be used to bend a steel sheet with high accuracy without making difficult modifications to the equipment. Even if it exists, it aims at providing the bending method which can obtain a predetermined shape.
すなわち、本発明の要旨構成は次のとおりである。
１．金属製のダイ部と、被処理板材を押える板材押えと、ダイ部から突出た板材を押圧するパンチとを用いた板材の曲げ加工において、板厚：0.3〜1.0mmの、金属製板材または金属を含む複合材からなる板材を、該板材の曲げ稜線内側の曲率半径を0.1mm以下で、かつ直角に折り曲げるにあたり、
上記ダイ部から突出た板材に、板材の曲げ稜線と平行であってかつ曲げ方向と逆向きのつめ鉤部を設ける予備加工を施し、さらに、上記板材を曲げ稜線に沿って曲げるに際し、上記つめ鉤部に上記パンチを掛けて板材を折り曲げる板材の曲げ加工方法。
That is, the gist configuration of the present invention is as follows.
1. In the bending process of a plate material using a metal die portion, a plate material presser for pressing the plate material to be processed, and a punch for pressing the plate material protruding from the die portion, a metal plate material or metal having a plate thickness of 0.3 to 1.0 mm When bending a plate material made of a composite material containing 0.1 to 0.1 mm or less of the radius of curvature inside the bending ridge line of the plate material,
The plate material protruding from the die portion is subjected to preliminary processing to provide a claw flange portion that is parallel to the bending ridge line of the plate material and opposite to the bending direction, and when the plate material is bent along the bending ridge line, A method of bending a plate material by bending the plate material by applying the punch to the collar portion.
２．前記つめ鉤部の折り曲げ代を、５〜10mmの範囲とする前記１に記載の板材の曲げ加工方法。 2. 2. The method for bending a plate material according to 1 above, wherein a bending margin of the claw collar portion is in a range of 5 to 10 mm.
本発明では、予備加工を施し、曲げ方向と逆向きのつめ鉤部を設けることで、板厚の全域に亘って、均一に歪を導入することができ、その結果、安定した加工精度を得ることができる。 In the present invention, by performing preliminary processing and providing a claw hook portion opposite to the bending direction, strain can be introduced uniformly over the entire thickness of the plate, and as a result, stable processing accuracy is obtained. be able to.
本発明に従う板材の曲げ加工方法について説明する。
本発明で、曲げ加工に供する被処理板材は、板厚：0.3〜1.0mmの、金属製板材または金属を含む複合材からなる板材である。特に、スプリングバックが大きい板厚だからである。
以下、図を用いつつ、本発明を具体的に説明する。
A method for bending a plate material according to the present invention will be described.
In the present invention, the plate material to be processed for bending is a plate material made of a metal plate material or a metal-containing composite material having a plate thickness of 0.3 to 1.0 mm. This is because the springback is particularly thick.
Hereinafter, the present invention will be specifically described with reference to the drawings.
本発明における曲げ加工は、板材の曲げ稜線内側の曲率半径を0.1mm以下で、かつ直角に折り曲げる加工であって、本発明は、図１の(ａ)〜(ｃ)に示す順番に行われる。図中、１は試料（板材）、２はダイ、３は押さえ板(パッド)、４はパンチ、５はガイドプレート、６はシャフ卜および７はつめ鈎部である。 The bending process in the present invention is a process in which the radius of curvature inside the bending ridge line of the plate material is 0.1 mm or less and is bent at a right angle, and the present invention is performed in the order shown in FIGS. . In the figure, 1 is a sample (plate material), 2 is a die, 3 is a pressing plate (pad), 4 is a punch, 5 is a guide plate, 6 is a shuffle rod, and 7 is a pawl.
すなわち、本発明における曲げ加工は、金属製のダイ部と、被処理板材を押える板材押えと、ダイ部から突出た板材を押圧するパンチとを具えた装置を用いると共に、板材(試料)の加工後の表面の折り目（曲げ稜線）を境として、片側を、上下にダイおよびパッドを配置して加工前に挟圧し、他方の側を、パンチにて抑圧して折り曲げる手順を踏むものである。
なお、上記装置は、板材の曲げ加工装置として、従来公知の装置を用いることができる、また、上記板材の曲げ稜線内側とは、図１(ｃ)のＡの部分を示す。従って、本発明における曲げ加工とは、Ａ部の角度を直角とし、さらにその曲率半径を0.1mm以下とする加工を施すものである。加えて、本発明における直角とは、90度から鈍角側に３度以内を意味する。
That is, the bending process in the present invention uses a device including a metal die part, a plate material presser for pressing the plate material to be processed, and a punch for pressing the plate material protruding from the die part, and processing the plate material (sample). With the crease (bending ridge line) on the rear surface as a boundary, a die and a pad are arranged on one side and clamped before processing by pressing one side, and the other side is pressed by a punch and bent.
In addition, the said apparatus can use a conventionally well-known apparatus as a bending apparatus of a board | plate material, and the bending ridgeline inner side of the said board | plate material shows the part of A of FIG.1 (c). Therefore, the bending process in the present invention is a process in which the angle of the portion A is a right angle and the radius of curvature is 0.1 mm or less. In addition, the right angle in the present invention means within 3 degrees from 90 degrees to the obtuse angle side.
ここで、本発明は、折り曲げ加工の前に、予備加工として、被処理板材の端部の成形を行い、図２の(ａ)〜(ｃ)に示すようなつめ鉤部を設ける。そして、曲げ加工用のパンチ先端をつめ鉤部に掛けて押圧するために、板厚全域に亘って効果的に引張り力を作用することができる。このため、曲げ加工時には、スプリングバックを生じやすい板厚の薄い材料であっても、板厚全域を無理なく塑性変形させることができると共に、金型解放後の形状戻りであるスプリングバックを、確実に抑制することができるようになるのである。なお、本発明では、上記パンチが、曲げ加工中常につめ鈎部に掛かっていなければならないわけではなく、少なくとも、折り曲げ加工の終了段階で掛かっていれば良い。 Here, according to the present invention, before the bending process, as the preliminary process, the end portion of the plate material to be processed is formed, and the claw hooks as shown in FIGS. 2A to 2C are provided. Then, since the bending punch tip is put on the claw and pressed, the tensile force can be effectively applied over the entire plate thickness. For this reason, during bending, even a thin plate material that is prone to spring back can be easily plastically deformed throughout the plate thickness, and the spring back that returns the shape after releasing the mold can be reliably It becomes possible to suppress it. In the present invention, the punch does not always have to be applied to the claw portion during the bending process, and may be applied at least at the end of the bending process.
ここに、本発明におけるつめ鉤部は、図２(ａ)に示したように、θ1を略直角として折り曲げた形状が考えられる。図中、Ｂは、つめ鈎部の幅（折り曲げ代）を意味する。 Here, as shown in FIG. 2 (a), the pawl portion in the present invention may have a shape bent with θ 1 being substantially a right angle. In the figure, B means the width (bending margin) of the claw collar.
また、図２(ｂ)に示したように、θ2を鈍角として折り曲げた形状も考えられる。図中、Ｃは、つめ鈎部の幅（折り曲げ代）を意味する。 In addition, as shown in FIG. 2B, a shape bent with θ 2 being an obtuse angle is also conceivable. In the figure, C means the width (bending margin) of the claw collar.
さらに、図２(ｃ)に示したように、θ3を鋭角として折り曲げた形状も考えられる。図中、Ｄは、つめ鈎部の幅（折り曲げ代）を意味する。 Furthermore, as shown in FIG. 2 (c), a bent shape with θ 3 as an acute angle is also conceivable. In the figure, D means the width (bending margin) of the claw collar.
本発明で効果を得るメカニズムは、上述したとおりであるため、パンチ先端が掛かれば予備加工の折り曲げ形状に特に限定はないが、予備加工の折り曲げ代（図２(ａ)〜(ｃ)中、Ｂ〜Ｄで示した長さ）は、パンチとダイの隙間を乗り越えてつめ鉤部が確実にパンチ側に掛かるようにする必要があるため、５〜10mm程度以上確保することが望ましい。 Since the mechanism for obtaining the effect of the present invention is as described above, there is no particular limitation on the preliminarily bent shape as long as the punch tip is applied, but the preliminarily bending allowance (in FIGS. 2 (a) to (c), The length shown by B to D is preferably secured to about 5 to 10 mm or more because it is necessary to get over the gap between the punch and the die so that the claw hook is surely hooked on the punch side.
また、本発明は、製品や部品加工のゲージダウンを実施する場合に、金型のクリアランス条件を変更せずに試作することも可能である。 In addition, the present invention can also be prototyped without changing the mold clearance conditions when performing gauge down of product or component processing.
上記した条件を満足しつつ、稜線を挟んだ垂直面と水平面との両面を同時に押圧し、さらに板材内側の曲率半径を0.1mm以下で、かつ曲げ角度を直角とすることで、本発明における板材の曲げ加工が達成される。 While satisfying the above-mentioned conditions, by simultaneously pressing both the vertical plane and the horizontal plane sandwiching the ridgeline, the curvature radius inside the sheet material is 0.1 mm or less, and the bending angle is a right angle, the sheet material in the present invention Bending is achieved.
本発明では、上記パンチの先端部が、曲げ加工後に板材の曲げ稜線を挟んだ垂直面と水平面とを併せて押圧する逆Ｌ字形の切欠きを有し、さらに、この切欠き部の内側を、板材の曲げ稜線方向に沿って、上記パンチの両端を含む稜線全長の10％以上の軟質部分とすることができる。この際の軟質部分の比率は、以下の式（１）に従うことで求めることができる。従って、本発明に用いるパンチは、式（１）および式（１）´の右辺が10以上になるものを使用することができる。
軟質部分の比率 ＝ ｛（LS１＋LS２＋LS３）／Ｌｐ｝×100・・・（１）
但し、Ｌｐはパンチの有効長、LS１、LS２乃至LSｎ（ｎは整数）は板材に接する軟質部分のそれぞれの長さを示す。
すなわち、一般式は、
軟質部分の比率 ＝ ｛（ΣLSｎ）／Ｌｐ｝×100・・・（１）´
となる。
In the present invention, the tip of the punch has an inverted L-shaped notch that presses the vertical surface and the horizontal surface sandwiching the bending ridge line of the plate material after bending, and further, the inner side of the notch In addition, along the bending ridge line direction of the plate material, it can be a soft portion of 10% or more of the entire ridge line including both ends of the punch. The ratio of the soft part in this case can be obtained by following the following formula (1). Therefore, as the punch used in the present invention, those in which the right sides of the formulas (1) and (1) ′ are 10 or more can be used.
Ratio of soft portion = {(LS 1 + LS 2 + LS 3 ) / L p } × 100 (1)
Here, L p represents the effective length of the punch, and LS 1 , LS 2 to LS n (n is an integer) represents the length of each soft portion in contact with the plate material.
That is, the general formula is
Soft part ratio = {(ΣLS n ) / L p } × 100 (1) ′
It becomes.
ここで、ゴムの貼り付け領域（パンチ部）の稜線方向の長さは、最小値として板厚の２〜３倍程度以上あれば良いが、貼り付ける部材の形状が小さい場合には、金型への取り付けが難しくなるため、稜線方向及びパンチ端面と垂直方向のそれぞれの一辺が10〜100mm程度のものが扱いやすい。また、奥行き方向の長さは、板厚の10倍程度が必要で、20〜50mm程度が使いやすい。厚みは、１〜20mm、また肩Ｒとしては、角度を付与せず水平とする方法や、１〜５mmr程度とする方法が考えられる。１mmr程度以下として、肩Ｒが、あまりに小さい場合には、割れが発生しやすくなり好ましくない。 Here, the length in the ridge line direction of the rubber bonding region (punch portion) may be about 2 to 3 times the plate thickness as a minimum value, but if the shape of the member to be bonded is small, the mold Since it is difficult to attach to the punch, it is easy to handle one having a side of about 10 to 100 mm in each direction in the ridge line direction and the direction perpendicular to the punch end face. Also, the length in the depth direction needs to be about 10 times the plate thickness, and about 20 to 50 mm is easy to use. The thickness may be 1 to 20 mm, and the shoulder R may be horizontal without giving an angle, or may be 1 to 5 mmr. If the shoulder R is too small when it is about 1 mmr or less, cracks are likely to occur, which is not preferable.
ここで、本発明の軟質部分に用いられる軟質材は、硬度で、JIS-K6253 記載のタイプＡもしくはＤタイプであって、デュプロメータによる測定値にて20〜100程度のものが好ましく、具体的には、金型用の天然ゴムやウレタンゴムなどが適している。また、ポリウレタンなども好ましい。 Here, the soft material used for the soft part of the present invention is a hardness, which is a type A or D type described in JIS-K6253, preferably about 20 to 100 as measured by a duprometer. For this, natural rubber and urethane rubber for molds are suitable. Also preferred is polyurethane.
また、上記軟質材は、折り曲げ加工後の板材と対する逆L字状の切欠き形状になる面に貼り付けられ、加工終了時のコーナー相当部を抑圧する。そして、稜線方向位置では、前記形態となる部分が少なくとも製品の両端を含む稜線全長の10％以上となるように配置している。
というのは、10％以上の軟質部分を、上記のようにパンチに貼り付けると、軟質部分の無い部分における試料は、金型になじみ難いものの、軟質部分の有る部分においては金型になじみ易くなる。その結果、軟質部分の有る部分、無い部分の両部分において、加工特性に相違が生じる。すなわち、双方の相違により、不連続になっている部分において、塑性変形が残りやすくなるので、この作用を利用するとスプリングバックを抑制することが可能となる。
Further, the soft material is affixed to a surface having an inverted L-shaped notch shape with respect to the plate material after being bent, and suppresses a corner-corresponding portion at the end of the processing. And in the ridgeline direction position, it arrange | positions so that the part used as the said form may become 10% or more of the ridgeline full length including the both ends of a product at least.
This is because, when a soft part of 10% or more is attached to the punch as described above, the sample in the part without the soft part is difficult to fit in the mold, but it is easy to fit in the mold in the part with the soft part. Become. As a result, there is a difference in processing characteristics between the portion with and without the soft portion. That is, because of the difference between the two, plastic deformation tends to remain in the discontinuous portion. Therefore, when this action is used, springback can be suppressed.
上記軟質部分の大きさは、適宜変更することができるが、厚みは１〜20mm程度、幅は10〜100mm程度が好ましい。また、稜線長さに設定する数としては、１箇所〜10箇所程度が適当である。 The size of the soft part can be appropriately changed, but the thickness is preferably about 1 to 20 mm and the width is preferably about 10 to 100 mm. Moreover, as a number set to a ridgeline length, about 1-10 places is suitable.
また、上述した以外のパンチの加圧力や降下速度等の曲げ加工条件は、従来公知の加工条件を用いることができる。 Moreover, conventionally well-known processing conditions can be used for bending processing conditions, such as the pressurizing force of a punch other than above-mentioned, and a fall speed.
本発明の効果を検証する実験を下記手順にて行った．
素材として表１に示す70mm角の冷延板（SPCC）を用い、また図１に記載の設備を用いてL字曲げ成形を実施した。
さらに、曲げ加工前の素材形状は、従来条件では、予備加工の曲げを実施せずに、本発明では、予備加工を行ってつめ鉤部を設けた。
なお、つめ鉤部は、図２（ａ）の形状で、Ｂ部の長さは、７mmとした。
An experiment for verifying the effect of the present invention was performed according to the following procedure.
A 70 mm square cold rolled plate (SPCC) shown in Table 1 was used as a material, and L-shaped bending was performed using the equipment shown in FIG.
Furthermore, the material shape before bending is not subjected to pre-bending bending under conventional conditions, and in the present invention, preliminary processing is performed to provide a pawl portion.
The pawl portion has the shape shown in FIG. 2A, and the length of the portion B is 7 mm.
板厚が0．3mmの鋼飯を用いた場合の、曲げ加工後の目標角度からの角度ズレを、図３に示す。従来条件では、１〜２度の角度ズレの頻度分布が最も多かったが、本発明に従う条件で最も頻度が高い角度ズレ量は、０〜１度の範囲のものであった。すなわち、本発明に従う曲げ加工方法は、従来条件に対して優れた曲げ加工精度が得られることが明らかになった。 FIG. 3 shows the angle deviation from the target angle after bending when a steel rice having a thickness of 0.3 mm is used. Under the conventional conditions, the frequency distribution of the angle deviation of 1 to 2 degrees was the largest, but the angle deviation amount having the highest frequency under the conditions according to the present invention was in the range of 0 to 1 degree. That is, it has been clarified that the bending method according to the present invention can provide excellent bending accuracy with respect to the conventional conditions.
また，他の板厚の場合においても、図４に示すように、いずれも平均値で30％以上の角度ズレを改善する効果が確認され、簡単かつ確実に曲げ加工精度の向上が図れることが明らかになった。 Also, in the case of other plate thicknesses, as shown in FIG. 4, the effect of improving the angle deviation of 30% or more on average is confirmed, and the bending accuracy can be improved easily and reliably. It was revealed.
さらに、発明者らは、上記つめ鈎部の折り曲げ角度に関係なく、また、合金系の鋼材及びクロム系ステンレス鋼、ニッケル系ステンレス鋼などの金属材、およびこれらを積層させた複合材を、被処理板材として用いた場合においても同様の効果を得られることを確認している。 Furthermore, the inventors covered alloy steel materials, metal materials such as chromium-based stainless steels, nickel-based stainless steels, and composite materials obtained by laminating these materials regardless of the angle at which the pawls are bent. It has been confirmed that similar effects can be obtained even when used as a treatment plate.
１ 試料（板材）
２ ダイ
３ 押さえ板(パッド)
４ パンチ
５ ガイドプレート
６ シャフ卜
７ つめ鈎部
1 Sample (plate material)
2
4
Claims (2)
上記ダイ部から突出た板材に、板材の曲げ稜線と平行であってかつ曲げ方向と逆向きのつめ鉤部を設ける予備加工を施し、さらに、上記板材を曲げ稜線に沿って曲げるに際し、上記つめ鉤部に上記パンチを掛けて板材を折り曲げる板材の曲げ加工方法。 In the bending process of a plate material using a metal die portion, a plate material presser for pressing the plate material to be processed, and a punch for pressing the plate material protruding from the die portion, a metal plate material or metal having a plate thickness of 0.3 to 1.0 mm When bending a plate material made of a composite material containing 0.1 to 0.1 mm or less of the radius of curvature inside the bending ridge line of the plate material,
The plate material protruding from the die portion is subjected to preliminary processing to provide a claw flange portion that is parallel to the bending ridge line of the plate material and opposite to the bending direction, and when the plate material is bent along the bending ridge line, A method of bending a plate material by bending the plate material by applying the punch to the collar portion.
The bending method of the board | plate material of Claim 1 which sets the bending allowance of the said nail | claw hook part to the range of 5-10 mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2013107122A JP2014226683A (en) | 2013-05-21 | 2013-05-21 | Bend processing method of plate |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2013107122A JP2014226683A (en) | 2013-05-21 | 2013-05-21 | Bend processing method of plate |
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| JP2014226683A true JP2014226683A (en) | 2014-12-08 |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104889204A (en) * | 2015-05-25 | 2015-09-09 | 苏州市华宁机械制造有限公司 | Steel plate machining tool |
| CN110216173A (en) * | 2019-07-19 | 2019-09-10 | 嘉兴通林通用设备有限公司 | A kind of bending machine for being not easy to scratch plate |
| CN110636910A (en) * | 2017-05-15 | 2019-12-31 | 萨尔瓦尼尼意大利股份公司 | Bending machine for metal sheets |
-
2013
- 2013-05-21 JP JP2013107122A patent/JP2014226683A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104889204A (en) * | 2015-05-25 | 2015-09-09 | 苏州市华宁机械制造有限公司 | Steel plate machining tool |
| CN110636910A (en) * | 2017-05-15 | 2019-12-31 | 萨尔瓦尼尼意大利股份公司 | Bending machine for metal sheets |
| CN110216173A (en) * | 2019-07-19 | 2019-09-10 | 嘉兴通林通用设备有限公司 | A kind of bending machine for being not easy to scratch plate |
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