JPS645967B2 - - Google Patents
Info
- Publication number
- JPS645967B2 JPS645967B2 JP15299282A JP15299282A JPS645967B2 JP S645967 B2 JPS645967 B2 JP S645967B2 JP 15299282 A JP15299282 A JP 15299282A JP 15299282 A JP15299282 A JP 15299282A JP S645967 B2 JPS645967 B2 JP S645967B2
- Authority
- JP
- Japan
- Prior art keywords
- rotation
- plate
- detector
- support member
- press brake
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D5/00—Bending sheet metal along straight lines, e.g. to form simple curves
- B21D5/02—Bending sheet metal along straight lines, e.g. to form simple curves on press brakes without making use of clamping means
- B21D5/0281—Workpiece supporting devices
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Bending Of Plates, Rods, And Pipes (AREA)
Description
【発明の詳細な説明】
本発明は、材料の曲げによる回転に追従して板
材を支持するプレスブレーキの材料支持装置に関
する。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a material support device for a press brake that supports a plate material by following the rotation of the material due to bending.
従来のプレスブレーキの材料支持装置は、第１
図及び第２図に示すように構成されている。即ち
板材１を支持テーブル２上でプレスブレーキの下
型３に対して位置決めし、プレスブレーキのラム
（図示せず）を下降させると、第２図に示すよう
にプレスブレーキの上型４が下降して板材１が曲
がり始め、リミツトスイツチ５は板材１と離れ
る。リミツトスイツチ５が離れた信号により油圧
シリンダー６が働き、回転機構７により支持され
ている支持テーブル２は本体８に対して回転中心
９を中心に２点鎖線で示すように回転し、再びリ
ミツトスイツチ５が板材１と接触し停止する。以
上の動作のくり返しにより、支持テーブル２は常
に板材１に遅れて追従していく。またプレスブレ
ーキの上型４が板材１に接触する直前から、マグ
ネツト１０が働き板材１は支持テーブル２上に保
持される。 The material support device of the conventional press brake is
It is constructed as shown in FIG. That is, when the plate material 1 is positioned relative to the lower die 3 of the press brake on the support table 2 and the ram (not shown) of the press brake is lowered, the upper die 4 of the press brake is lowered as shown in FIG. Then, the plate 1 begins to bend, and the limit switch 5 separates from the plate 1. The hydraulic cylinder 6 is actuated by the signal that the limit switch 5 is released, and the support table 2 supported by the rotation mechanism 7 rotates with respect to the main body 8 about the rotation center 9 as shown by the two-dot chain line, and the limit switch 5 is released again. It comes into contact with plate material 1 and stops. By repeating the above operations, the support table 2 always follows the plate material 1 behind. Also, immediately before the press brake upper mold 4 contacts the plate material 1, the magnet 10 works to hold the plate material 1 on the support table 2.
上記のような従来のプレスブレーキの材料支持
装置では、常に大きな追従遅れが生じる為にプレ
スブレーキのラム速度を低速にしなければなら
ず、また切欠きの大きな平板や、箱曲げ時などす
でに側面の曲げられた板材では、支持テーブルに
追従遅れが生じると、板材の自重、曲げ時の慣性
力、マグネツトの吸着力の合力による曲げ応力が
弾性限度を越え、塑性変形、いわゆる腰折れを生
じる。そのため、多少追従遅れがあつても以上の
ような問題が生じない平板にしか適用できないと
いう欠点があつた。 With the conventional press brake material support device described above, there is always a large follow-up delay, so the ram speed of the press brake must be kept low. In a bent plate, if there is a follow-up delay in the support table, the bending stress due to the combined force of the plate's own weight, inertia during bending, and the attraction force of the magnet exceeds the elastic limit, causing plastic deformation, so-called buckling. Therefore, it has the disadvantage that it can only be applied to flat plates where the above-mentioned problems do not occur even if there is a slight follow-up delay.
本発明は、上記欠点を解決するためになされた
もので、追従遅れがほとんどなく、どのような形
状の板材にも使用できるプレスブレーキの材料支
持装置を得ることを目的とするものである。 The present invention has been made to solve the above-mentioned drawbacks, and an object of the present invention is to provide a material support device for a press brake that has almost no follow-up delay and can be used for plate materials of any shape.
本発明は上記目的を達成するためになされたも
ので、検出器からの信号により、計算で求めたプ
レスブレーキの下型の肩部における板材の回転角
の変化に等しく支持部材を回転駆動するプレスブ
レーキの材料支持装置を提供するものである。 The present invention has been made to achieve the above object, and is a press that uses a signal from a detector to rotate a support member equal to the calculated change in the rotation angle of the plate material at the shoulder of the lower die of the press brake. A material support device for a brake is provided.
以下図面を用いて本発明を説明する。 The present invention will be explained below using the drawings.
第３図乃至第５図はそれぞれ本発明の実施例を
示す正面図、平面図、側面図である。１１は支持
部材、１２は支持部材１１を板材１の回転中心９
を中心に回転するように支持している回転機構で
ある。回転機構１２を駆動する駆動軸１３には、
第の歯車１４が固定され、支持部材１１の回転
を制御するモータ１５の軸には第の歯車１６が
取付けられ、両歯車１４，１６間には歯付ベルト
１７が駆動軸１３を駆動するように設けられてい
る。回転機構１２及びモーター１５を保持してい
る本体１８には、板材１の回転開始を検出する検
出器（第１の検出器）１９が設けられており、駆
動軸１３にはこれを支持する軸受２０、さらには
駆動軸すなわち支持部材１１の回転角を検出する
シヤフトエンコーダ（第２の検出器）２１が設け
られている。 3 to 5 are a front view, a plan view, and a side view, respectively, showing an embodiment of the present invention. 11 is a support member, 12 is a support member 11 which is the rotation center 9 of the plate material 1;
This is a rotating mechanism that supports the device so that it rotates around the center. The drive shaft 13 that drives the rotation mechanism 12 includes
A second gear 16 is attached to the shaft of a motor 15 to which the first gear 14 is fixed and which controls the rotation of the support member 11. A toothed belt 17 is arranged between the gears 14 and 16 to drive the drive shaft 13. It is set in. The main body 18 that holds the rotation mechanism 12 and the motor 15 is provided with a detector (first detector) 19 that detects the start of rotation of the plate 1, and the drive shaft 13 has a bearing that supports it. 20, and a shaft encoder (second detector) 21 for detecting the rotation angle of the drive shaft, that is, the support member 11.
次に上記のように構成した本発明の作用を説明
する。支持部材１１の回転の開始と駆動方法は以
下の通りである。板材１を位置決めした後、プレ
スブレーキのラムを下降させると、プレスブレー
キの上型４により板材１は曲げられ、回転中心９
を中心に回転を始める。この回転の開始、すなわ
ち板材１と検出器１９の距離の変化を例えば磁気
センサーにより高速高精度に検出し、第６図に示
すような制御回路の制御装置２２に信号を入力す
る。入力信号により制御装置２２で板材１の回転
開始の判断をし、サーボアンプ２３に指令パルス
を送ると、指令パルスに従つた速度でモータ１５
が駆動される。モータ１５が駆動すると、第の
歯車１６、歯付ベルト１７、第１の歯車１４を介
して駆動軸１３が回転し、さらに回転機構１２を
介して支持部材１１を板の回転と同心に回転駆動
する。なお板材１の回転に対する支持部材１１の
追従方法は以下の通りである。 Next, the operation of the present invention configured as described above will be explained. The method for starting and driving the rotation of the support member 11 is as follows. After positioning the plate 1, when the ram of the press brake is lowered, the plate 1 is bent by the upper die 4 of the press brake, and the center of rotation 9
Start rotating around. The start of this rotation, that is, the change in the distance between the plate material 1 and the detector 19, is detected at high speed and with high accuracy by, for example, a magnetic sensor, and a signal is input to a control device 22 of a control circuit as shown in FIG. Based on the input signal, the control device 22 determines whether to start rotating the plate material 1 and sends a command pulse to the servo amplifier 23, which causes the motor 15 to operate at a speed according to the command pulse.
is driven. When the motor 15 is driven, the drive shaft 13 is rotated via the first gear 16, the toothed belt 17, and the first gear 14, and the support member 11 is driven to rotate concentrically with the rotation of the plate via the rotation mechanism 12. do. Note that the method of following the rotation of the plate material 1 by the support member 11 is as follows.
平板のＶ曲げに関しては従来から解析されてお
り、第７図のラムのストローク、すなわち変形過
程(a)〜(d)による加圧力の変化に示されるように、
複雑な変形過程をたどる。第８図に示すように平
板90゜曲げを考えると、曲げの初期過程、すなわ
ち板材の支持点が下型の肩（板材の回転中心９）
にある段階（第７図の(a)過程）においてはｘ、ｙ
座標糸を定め、任意の位置における板の曲率半径
をρ、その点における接線のｘ軸に対する角度を
θ、回転中心９における接線角をθL、プレスブレ
ーキの上型の位置を下型上面からの距離でＨ、下
型の肩巾を2L、上型の下降速度をＳとすると、
角度θと上型の位置Ｈの関係式として次式が導か
れている。 V-bending of a flat plate has been analyzed in the past, and as shown in the stroke of the ram in Figure 7, that is, the change in pressing force due to deformation processes (a) to (d),
It follows a complex deformation process. As shown in Figure 8, when we consider bending a flat plate 90 degrees, the initial stage of bending, that is, the supporting point of the plate is the shoulder of the lower mold (center of rotation 9 of the plate).
At the stage (process (a) in Figure 7), x, y
Determine the coordinate thread, set the radius of curvature of the plate at a given position as ρ, the angle of the tangent at that point to the x-axis as θ, the tangent angle at the center of rotation 9 as θ L , and the position of the upper die of the press brake from the top surface of the lower die. If the distance is H, the shoulder width of the lower die is 2L, and the descending speed of the upper die is S, then
The following equation is derived as a relational equation between the angle θ and the position H of the upper mold.
Ｈ＝∫L 0sinθ・dx＋∫L 0１／２sin3θ・dx
＋∫L 0３／８sin5θ・dx ……(1)
Ｈと角度θLの関係は近似的に次式で表わされ
る。H=∫ L 0 sinθ・dx+∫ L 0 1/2sin 3 θ・dx +∫ L 0 3/8sin 5 θ・dx ...(1) The relationship between H and angle θL is approximately expressed by the following equation .
Ｈ＝Ｌ（n′＋１）／n′＋２sinθL＋3L（n′＋１
）3sin3θL／（n′＋２）（2n′＋３）（3n′＋４）
＋45L（n′＋１）5・sin5θL／（n′＋２）（2n
′＋３）（3n′＋４）（4n′＋５）（5n′＋６）……(2
)
ここでn′は、板材の真応力真ひずみの関係式σ
＝Fε1/n′における値である。また箱曲げ、すなわ
ちすでに側面がコ形に曲げられた材料の場合に
は、第８図に示すような撓み曲線は示さずに、第
９図に示すように直線で近似できるので、角度θL
とＨの関係は次のように表わされる。 H=L(n'+1)/n'+2sinθ L +3L(n'+1
) 3 sin 3 θ L / (n'+2) (2n'+3) (3n'+4) +45L (n'+1) 5・sin 5 θ L / (n'+2) (2n
'+3) (3n'+4) (4n'+5) (5n'+6)...(2
) Here, n′ is the relational expression σ of the true stress and true strain of the plate material.
=Fε 1/n ′. In addition, in the case of box bending, that is, in the case of a material whose side surface has already been bent into a U-shape, the deflection curve shown in Fig. 8 is not shown, but can be approximated by a straight line as shown in Fig. 9, so that the angle θ L
The relationship between and H is expressed as follows.
tanθL＝Ｈ／Ｌ従つてθL＝tan-1（Ｈ／Ｌ） ……(3)
ところで第７図において、平板の曲げの初期過
程(a)の段階では、加圧力は低くほとんど増加して
いない。すなわちラム速度Ｓはほとんど変化しな
いと考えられる。従つて曲げ開始からの時間をＴ
とすると、(2)式及び(3)式のＨはＳ・Ｔで置き替え
られる。また平板の場合角度θLは、(a)の段階で最
終曲げ角である45゜まで変化する。従つて支持部
材１１は(2)式及び(3)式で計算される曲げ角θLに等
しく回転すれば、金型から出した部分の板材１の
回転に追従して支持することができる。そこで本
発明装置の制御装置２２は平板か箱曲げかといつ
た材料の断面形状、ラム速度Ｓ、材料の種類
（n′の値）、金型寸法Ｌを入力すると、時間Ｔに対
するθLの値を演算推定し、メモリにストアする。
そして、検出器１９からの信号によつてモータ１
５を駆動し、メモリにストアされた回転位置と速
度に比例した指令パルスを送る。したがつてモー
タ１５を駆動軸１３に設けられた支持部材１１の
回転角を検出するシヤフトエンコーダ２１からの
回転位置信号と一致するように駆動制御すること
により、支持部材１１は板材１の回転に追従し、
支持することが可能になる。tanθ L = H/L Therefore, θ L = tan -1 (H/L) ...(3) By the way, in Fig. 7, in the initial stage (a) of bending the flat plate, the applied force is low and hardly increases. Not yet. In other words, it is considered that the ram speed S hardly changes. Therefore, the time from the start of bending is T
Then, H in equations (2) and (3) is replaced by S.T. In addition, in the case of a flat plate, the angle θ L changes to the final bending angle of 45° at the stage (a). Therefore, if the supporting member 11 is rotated equal to the bending angle θ L calculated by equations (2) and (3), it can follow the rotation of the plate material 1 taken out from the mold and support it. Therefore, the control device 22 of the apparatus of the present invention inputs the cross-sectional shape of the material such as flat plate or box bending, the ram speed S, the type of material (value of n'), and the mold dimension L, and then inputs the value of θ L with respect to time T. Calculate and store in memory.
Then, the motor 1 is controlled by the signal from the detector 19.
5 and sends command pulses proportional to the rotational position and speed stored in memory. Therefore, by controlling the drive of the motor 15 so as to match the rotational position signal from the shaft encoder 21 that detects the rotation angle of the support member 11 provided on the drive shaft 13, the support member 11 can be controlled in accordance with the rotation of the plate material 1. follow,
It becomes possible to support.
以上、本発明の実施例では、駆動軸１３の回転
角をシヤフトエンコーダ２１から制御装置２２に
フイードバツクするセミクローズドループによる
方式を示したが、パルスモータ等の使用したオー
プンループ制御でもよく、また回転開始の検出
は、タツチセンサー等の他の検出器を使用した
り、プレスブレーキの上型４と板材１の接触を検
出するように構成してもよい。 As described above, in the embodiments of the present invention, a semi-closed loop system is shown in which the rotation angle of the drive shaft 13 is fed back from the shaft encoder 21 to the control device 22, but open loop control using a pulse motor or the like may also be used. The start detection may be performed by using another detector such as a touch sensor or by detecting contact between the upper die 4 of the press brake and the plate material 1.
以上の説明から明らかなように、本発明によれ
ば、高速で追従遅れがほとんどなく、平板や箱形
の板材に適用でき、しかも調整の必要がなく信頼
性の高いプレスブレーキの材料支持装置が得られ
るので、実施による効果大である。 As is clear from the above description, the present invention provides a material support device for a press brake that is fast, has almost no follow-up delay, can be applied to flat plates and box-shaped plates, does not require adjustment, and is highly reliable. Therefore, it is highly effective to implement it.
第１図及び第２図は、従来のプレスブレーキの
材料支持装置の一例を示す側面図、第３図、第４
図及び第５図はそれぞれ本発明実施例の正面図、
平面図及び側面図、第６図は本発明実施例の制御
回路図、第７図は本発明実施例を説明する為のラ
ムのストロークと変形過程及び加圧力の一般的関
係を示す線図、第８図は本発明実施例による平板
の曲げ解析を説明する線図、第９図は本発明実施
例による箱曲げ持の曲げ解析を説明する線図であ
る。
１１……支持部材、１２……回転機構、１３…
…駆動軸、１４，１６……歯車、１５……モー
タ、１７……歯付ベルト、１８……本体、１９…
…検出器、２２……制御装置。
1 and 2 are side views showing an example of a material support device of a conventional press brake, and FIGS. 3 and 4.
FIG. 5 is a front view of an embodiment of the present invention, respectively.
A plan view and a side view, FIG. 6 is a control circuit diagram of the embodiment of the present invention, and FIG. 7 is a diagram showing the general relationship between the stroke of the ram, the deformation process, and the pressurizing force for explaining the embodiment of the present invention. FIG. 8 is a diagram illustrating bending analysis of a flat plate according to an embodiment of the present invention, and FIG. 9 is a diagram illustrating bending analysis of a box bending support according to an embodiment of the present invention. 11...Support member, 12...Rotation mechanism, 13...
... Drive shaft, 14, 16 ... Gear, 15 ... Motor, 17 ... Toothed belt, 18 ... Main body, 19 ...
...Detector, 22...Control device.
Claims (1)
するように支持する回転機構と、 該回転機構を駆動するモーターを有する駆動部
と、 前記板材の回転開始を検出する第１の検出器
と、 前記モーターの回転に対応する前記支持部材の
回転角を検出する第２の検出器と、 予め与えられた前記板材の種類・断面形状・ラ
ム速度・金型寸法等の条件に基き、前記ブレーキ
の下型の肩部における板材の回転開始からの経過
時間に対応する回転位置を演算推定するととも
に、前記第１の検出器からの回転開始検出信号に
基き、前記演算推定された回転位置と第２の検出
器からの回転位置検出信号とが一致するように、
前記駆動部を制御する制御装置とを備えたことを
特徴とするプレスブレーキの材料支持装置。[Scope of Claims] 1. A support member that supports a plate material, a rotation mechanism that supports the support member so as to rotate around the shoulder of a lower mold of the brake, and a drive unit that has a motor that drives the rotation mechanism. , a first detector that detects the start of rotation of the plate; a second detector that detects a rotation angle of the support member corresponding to the rotation of the motor; and a predetermined type and cross-sectional shape of the plate. - Based on conditions such as ram speed and mold dimensions, calculate and estimate the rotational position corresponding to the elapsed time from the start of rotation of the plate material at the shoulder of the lower mold of the brake, and calculate the rotation position from the first detector. Based on the start detection signal, the calculated rotational position and the rotational position detection signal from the second detector match,
A material support device for a press brake, comprising: a control device for controlling the drive section.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP15299282A JPS5942125A (en) | 1982-09-02 | 1982-09-02 | Material supporting device of press brake |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP15299282A JPS5942125A (en) | 1982-09-02 | 1982-09-02 | Material supporting device of press brake |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS5942125A JPS5942125A (en) | 1984-03-08 |
| JPS645967B2 true JPS645967B2 (en) | 1989-02-01 |
Family
ID=15552588
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP15299282A Granted JPS5942125A (en) | 1982-09-02 | 1982-09-02 | Material supporting device of press brake |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5942125A (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111167891A (en) * | 2020-03-02 | 2020-05-19 | 爱克(苏州)机械有限公司 | A four-link structure follow-up support mechanism of a CNC bending machine |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5253727U (en) * | 1975-10-16 | 1977-04-18 |
-
1982
- 1982-09-02 JP JP15299282A patent/JPS5942125A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS5942125A (en) | 1984-03-08 |
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