EP2848329B1 - Procédé et dispositif de coupe de précision de pièces à usiner dans une presse - Google Patents

Procédé et dispositif de coupe de précision de pièces à usiner dans une presse Download PDF

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Publication number
EP2848329B1
EP2848329B1 EP14002380.5A EP14002380A EP2848329B1 EP 2848329 B1 EP2848329 B1 EP 2848329B1 EP 14002380 A EP14002380 A EP 14002380A EP 2848329 B1 EP2848329 B1 EP 2848329B1
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EP
European Patent Office
Prior art keywords
press
pressure
tool
return valve
cutting tool
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.)
Active
Application number
EP14002380.5A
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German (de)
English (en)
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EP2848329A1 (fr
Inventor
Norbert Ziesel
Axel Wittig
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Webo Werkzeugbau Oberschwaben GmbH
Original Assignee
Webo Werkzeugbau Oberschwaben GmbH
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Publication of EP2848329A1 publication Critical patent/EP2848329A1/fr
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Publication of EP2848329B1 publication Critical patent/EP2848329B1/fr
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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
    • B21D45/00—Ejecting or stripping-off devices arranged in machines or tools dealt with in this subclass
    • B21D45/003—Ejecting or stripping-off devices arranged in machines or tools dealt with in this subclass in punching machines or punching tools
    • 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
    • B21D28/00—Shaping by press-cutting; Perforating
    • B21D28/02—Punching blanks or articles with or without obtaining scrap; Notching
    • B21D28/16—Shoulder or burr prevention, e.g. fine-blanking
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T83/00—Cutting
    • Y10T83/04—Processes
    • Y10T83/0448—With subsequent handling [i.e., of product]
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T83/00—Cutting
    • Y10T83/202—With product handling means
    • Y10T83/2092—Means to move, guide, or permit free fall or flight of product
    • Y10T83/2096—Means to move product out of contact with tool

Definitions

  • the invention relates to a method and a precision cutting tool for the precision cutting of workpieces in a press according to the preamble of the independent claims 1 and 5.
  • the force generator for generating the contact pressure of the upper and lower tools are formed from mechanical spring elements.
  • An active press tool is thus not given.
  • These press tools work only passively, according to the stroke between the press ram and the press table.
  • the said spring elements are therefore passive, that is, they are uncontrolled and generate only a certain pressure without a control is shown as the pressure force is controlled to achieve a specific control or regulation of the press tools.
  • the lower tool counter punch When the lower tool counter punch is supported with a discharge spring.
  • the lower punch has, moreover, an end stop in the lower tool; Accordingly, the workpiece is cut against a fixed stop of the counter-holder in the lower tool.
  • DD 293 752 A5 a spring assembly in the area of the tool lower part, but it is an uncontrolled force generator, which is not able to control the punching waste to remove from the work area of the press.
  • the second part of the publications relates to purely mechanical presses, but in which the press tools are hydraulically driven. This is especially true of the DE 10 2005 045 454 B4 refer to.
  • the WO 87/02916 A1 discloses a method for precision cutting of workpieces with a press consisting of a press frame, in whose press opening a press ram is movably driven, which against a Press table works, wherein at least one of the press tool is formed as a cutting tool, which consists of at least a cutting punch, a hold-down, a cutting die and a counter-holder, the cutting tool works as a precision cutting tool, the lower tool part consists of a controlled retention module, the counter-holder in a certain Press ram position holds back to allow ejection of the waste, wherein the tool holder disposed in the lower part counterpart is supported on a hydraulic energy accumulator, the pressure force of which is variable by a hydraulic accumulator and a pressure accumulator connected to the check valve.
  • the object of the invention is to develop a method and a device for precision cutting of workpieces in a press so that a more precise control of the restraint module is possible.
  • fine blanking is a production method for chipless cutting and, optionally, simultaneous metal forming. It allows the production of high-precision parts.
  • the raw material of the cutting contour is held in fine cutting by means of a so-called ring point. Only then does a stamp with the desired shape cut the metal.
  • a significantly reduced cutting gap about 0.5% of the sheet thickness
  • transformations or embossing on the metal can be carried out in further steps within the same operation. Therefore, more and more of fineblanking / forming is spoken.
  • the invention is not limited thereto.
  • the invention allows a precision cutting tool with which a simple punching of material can be performed by means of a cutting die.
  • precision cutting tool in general terms on a fine blanking / punching / forming refers. All three options are provided in combination with one another or in isolation with the precision cutting tool according to the invention.
  • the precision cutting tool according to the invention is therefore not dependent on the drive elements of the press. It works completely autonomously, which means that the press itself can work by any method. It may thus be a hydraulic or a mechanical or a servo-motor driven press or other drive kinematics of a press, which play no role in the present invention, because the drive elements of the press are completely independent of the drive elements of the precision cutting tool.
  • the features of the invention provide the first advantage that the precision cutting tool can be used in any presses with any drive principles, and does not depend on the type of press. Instead of a conventional tool in a press can therefore be used as another tool autonomous precision cutting tool according to the invention. It can be modularly installed with other tools in the press room, without relying on the kinematics and the drive of the press itself.
  • the counter-holder of the lower tool is associated with a preferred mechanical disc spring package, which communicates with a restraint module via a pressure chamber.
  • the retention module according to the invention consists of a rechargeable pressure accumulator in conjunction with a check valve arranged in the flow path, the opening and closing state of which is controlled as a function of the press stroke.
  • the pressure accumulator is a pressure vessel, which is filled with a pressure medium, such as air, gas or a hydraulic medium (water or oil), and should control a pressure of about 100 to 250 bar.
  • the pressure force of the stored there pressure medium is sufficient to counteract the spring force of the spring assembly to retain this in a certain process position of the precision cutting tool.
  • FIG. 1 In FIG. 1 is generally shown that a press 1 of any kind having a press frame 2, in the press opening 3, a press ram 4 is arranged movably on any drive elements 5 in the arrow directions 6.
  • a number of press tools are arranged in the opening of the press frame 2; the type and number of press tools is arbitrary. It can be arranged in the opening 3 of the press frame 2 only a single press tool, but also a plurality of press tools.
  • the first press tool consists of a tool upper part 8 with an associated lower tool part 12.
  • the lower tool part 12 is fastened in each case on the upper side of the press table 7.
  • the second press tool consists of the upper tool part 9 and the lower tool part 13
  • the third press tool consists of the upper tool part 10 and the lower tool part 14.
  • FIG. 1 the passage direction of the workpiece to be machined in the press 1 in subsequent steps is shown. It is first processed in the tool 8, 12, then passes with the next power stroke in the tool 9, 13 and with the third power stroke in the tool 10, 14th
  • an inventive precision cutting tool 17 is arranged in the press frame 2. It consists of a tool upper part 11 and a tool lower part 15 arranged on the press table 7. In the exemplary embodiment shown, the precision cutting tool 17 is arranged at the end of the machining chain, on the right side of the press frame 2.
  • the invention is not limited thereto.
  • the precision cutting tool 17 may be installed alone in a press 1 or in any order with the press tools 8, 12; 9, 13; 10, 14 alternate. Also, more than one precision cutting tool 17 may be arranged.
  • the lower tool part 15 of the precision cutting tool 17 is active, that is, it has an active retaining module 34 capable of holding the anvil 24 (see FIG FIG. 2 ) in a certain press position to allow ejection of the waste 23.
  • FIG. 2 shows that in the tool upper part 11 one or more receptacles for a spring assembly 18 are arranged.
  • the respective spring package is prefers disc springs. Instead of such disc springs and other power storage can be used, such as hydraulic elements, mechanical springs, such as helical compression springs, spiral or wedge springs or the like.
  • the spring assemblies 18 act via associated pressure elements on a hold-down 20. Directly with the upper tool 11 a cutting punch 19 is connected.
  • a workpiece 21 is arranged, which forms a central waste piece, which is to be removed after the cutting out of the workpiece 21 controlled as waste 23 from the press room.
  • a counter-holder 24 which carries a hydraulic piston 25 on its underside, which engages with a pressure plate 29 in a hydraulic cylinder.
  • a pressure chamber 32 Above the pressure plate 29, a pressure chamber 32 is formed, which is under the pressure of a pressure accumulator 28, wherein a controllable check valve 27 is liquid or air conductively connected to the pressure chamber 32.
  • the upper and lower tool parts can also be exchanged in their function, which would mean cutting upwards with ejection downwards.
  • the waste designated at 23 may represent the workpiece and 21 the waste depending on the component design.
  • the pressure plate 29 is supported on the underside by a force accumulator, which is formed in the preferred embodiment as a disc spring assembly 26.
  • a force accumulator which is formed in the preferred embodiment as a disc spring assembly 26.
  • the invention is not limited thereto.
  • FIGS. 3 to 9 a complete workflow is shown in the operation of the precision cutting tool 17.
  • FIG. 3 the position 0 is shown.
  • the press ram 4 is in its TDC and the press room is open.
  • the workpiece 21 is exposed on the tool lower part 15, and the retaining module 34 is closed, which means that the pressure accumulator 28 is filled and under pressure, wherein the check valve 27 is closed. This is represented by the solid line with the closed state 30.
  • the hydraulic piston 25 With the downwardly moving counter-holder 24, the hydraulic piston 25 is also driven with its pressure plate 29 in the hydraulic cylinder in the tool lower part 15, whereby the pressure chamber 32 expands, and thus sucks the pressure medium at automatically open in this closed state check valve 27 from the pressure accumulator 28.
  • the tool technology of the precision cutting tool can be accommodated in any press design, without being acted upon or dependent on the press drive elements themselves.
  • the method according to the invention allows a smooth cut portion of more than 70% of the vertical cut surface, while in normal cutting it is known that a smooth cut portion of about 30% and 70% break surface in the cut surface can be realized.
  • the illustrated design of the precision cutting tool is cheaper compared to the usual, hydraulically driven precision cutting tools, and it can very high stroke rates are achieved with over 80 strokes per minute, which is possible with hydraulically driven precision cutting tools only with much higher cost and significantly higher costs.
  • the invention is therefore distinguished by a precision cutting tool having a hydraulic piston in the region of its counter-holder, which cooperates with a hydraulic cylinder having on its one side a pressure chamber for a pressure accumulator, and on its opposite side has a preferably mechanical energy storage.
  • This is a self-sufficient precision cutting tool, which actively performs a restraining movement for the counter-holder in a specific working cycle without such a movement being dependent on the press elements themselves.
  • the opening and closing movement of the check valve is controlled by the movement of the press ram 4.
  • any controls may be used, such as mechanical or electronic Wegmess institute and associated control devices and an electronic coupling with the press control, which also evaluates the position of the press ram.
  • the entire precision cutting tool is due to its minority of moving parts low maintenance, especially because it can be dispensed with hydraulically driven elements.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Shearing Machines (AREA)
  • Press Drives And Press Lines (AREA)
  • Punching Or Piercing (AREA)

Claims (7)

  1. Procédé de coupe de précision de pièces à usiner dans une presse (1) composée d'un châssis de presse (2) dans l'ouverture (3) duquel est entraîné, mobile, un coulisseau (4) qui fonctionne vers un plateau de presse (7), l'un au moins des outils de presse (8, 12 ; 9, 13 ; 10, 14 ; 11, 15 ; 17) étant conçu comme un outil de coupe qui se compose au moins d'un poinçon de coupe (19), d'un abaisseur (20), d'une matrice de coupe (22) et d'une contre-pointe (24), l'outil de coupe fonctionnant comme un outil de coupe de précision (17) dont la partie inférieure d'outil (15) se compose d'un module de retenue commandé (34) qui retient la contre-pointe (24) dans une position de coulisseau définie, afin de permettre une éjection des chutes (23), la contre-pointe (24) disposée dans la partie inférieure d'outil (15) portant sur son côté inférieur un piston hydraulique (25) qui pénètre avec une plaque de pression (29) dans un cylindre hydraulique, le côté inférieur de la plaque de pression (29) étant en appui sur un accumulateur d'énergie (26) dont la force de pression est apte à être modifiée grâce à un accumulateur de pression (28) contenant un agent de pression et à un clapet antiretour (27) relié audit accumulateur de pression (28), caractérisé en ce que l'accumulateur d'énergie est conçu comme un bloc-ressort (26) ou comme un accumulateur d'énergie pneumatique, un espace de pression (32) étant formé au-dessus de la plaque de pression (29) et étant soumis à la pression de l'accumulateur de pression (28) qui est relié audit espace de pression (32), de manière étanche au liquide ou à l'air, par l'intermédiaire du clapet antiretour (27) apte à être commandé, de telle sorte qu'avec le coulisseau qui descend, la contre-pointe (24) et en même temps le piston hydraulique (25) avec sa plaque de pression (29) soient amenés dans le cylindre hydraulique dans la partie inférieure d'outil (15), moyennant quoi l'espace de pression (32) se détend et aspire ainsi l'agent de pression à partir de l'accumulateur de pression (28) en présence du clapet antiretour (27) automatiquement ouvert dans cet état fermé (30), et lorsque le coulisseau (4) monte, le clapet antiretour (27) passe à son état ouvert (36), l'espace de pression (32) se vidant alors lentement grâce à la force élastique du bloc-ressort (26), et l'agent de pression, à l'état ouvert (36), revenant par le clapet antiretour (27) ouvert dans l'accumulateur de pression (28), la contre-pointe (24) montant jusqu'à sa position de départ.
  2. Procédé selon la revendication 1, caractérisé en ce que l'outil de coupe de précision (17) décrit un mouvement de retenue pour la contre-pointe (24) suivant un rythme défini sans qu'un tel mouvement dépende lui-même des éléments de presse ou de dispositifs actifs extérieurs aux outils (par exemple groupe hydraulique).
  3. Procédé selon la revendication 1 ou 2, caractérisé en ce qu'un bloc de ressorts à disques à action mécanique ou d'autres accumulateurs d'énergie mécaniques (26) sont utilisés comme élément supportant la contre-pointe (24), dont la courbe caractéristique de force est apte à être modifiée grâce à l'accumulateur de pression (28) et au clapet antiretour (27) qui coopère avec celui-ci, et à la position du coulisseau.
  4. Procédé selon l'une des revendications 1 à 3, caractérisé en ce que l'outil de coupe de précision fonctionne de manière autonome et décrit activement un mouvement de retenue pour la contre-pointe (24), suivant un rythme défini, sans qu'un tel mouvement dépende lui-même des éléments de presse.
  5. Outil de coupe de précision apte à être monté dans un châssis de presse (2) dans l'ouverture (3) duquel est entraîné, mobile, un coulisseau (4) qui fonctionne vers un plateau de presse (7), qui se compose au moins d'un poinçon de coupe (19), d'un abaisseur (20), d'une matrice de coupe (22) et d'une contre-pointe (24), la contre-pointe (24) disposée dans la partie inférieure d'outil (15) portant sur son côté inférieur un piston hydraulique (25) qui pénètre avec une plaque de pression (29) dans un cylindre hydraulique, le côté inférieur de la plaque de pression (29) étant en appui sur un accumulateur d'énergie (26) dont la force de pression est apte à être modifiée grâce à un accumulateur de pression (28) et à un clapet antiretour (27) relié audit accumulateur de pression (28), caractérisé en ce que l'accumulateur d'énergie est conçu comme un bloc-ressort (26) ou comme un accumulateur d'énergie pneumatique, un espace de pression (32) étant formé au-dessus de la plaque de pression (29) et étant soumis à la pression de l'accumulateur de pression (28) qui est relié audit espace de pression (32), de manière étanche au liquide ou à l'air, par l'intermédiaire du clapet antiretour (27) apte à être commandé.
  6. Presse de coupe de précision de pièces à usiner, avec un outil de coupe de précision selon la revendication 5.
  7. Presse selon la revendication 6, caractérisée en ce que les états ouvert et fermé du clapet antiretour (27) sont commandés en fonction de la course de la presse ou de la position du coulisseau.
EP14002380.5A 2013-09-11 2014-07-10 Procédé et dispositif de coupe de précision de pièces à usiner dans une presse Active EP2848329B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE201310015180 DE102013015180A1 (de) 2013-09-11 2013-09-11 Verfahren und Vorrichtung zum Präzisionsschneiden von Werkstücken in einer Presse

Publications (2)

Publication Number Publication Date
EP2848329A1 EP2848329A1 (fr) 2015-03-18
EP2848329B1 true EP2848329B1 (fr) 2017-06-14

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EP14002380.5A Active EP2848329B1 (fr) 2013-09-11 2014-07-10 Procédé et dispositif de coupe de précision de pièces à usiner dans une presse

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US (1) US9919353B2 (fr)
EP (1) EP2848329B1 (fr)
JP (1) JP6345050B2 (fr)
CA (1) CA2863345C (fr)
DE (1) DE102013015180A1 (fr)

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DE102015106859B4 (de) 2015-05-04 2018-06-14 Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V. Verfahren zum Scherschneiden hochfester Werkstoffe und Schneidwerkzeuganordnung
CN106270119B (zh) * 2016-10-31 2018-09-18 无锡海特精密模具有限公司 一种空调翅片模具的纵切机构
CN108555061A (zh) * 2018-06-23 2018-09-21 东莞理工学院 一种能够健康维护的压平切块收集一体机
CN109570330A (zh) * 2018-12-20 2019-04-05 安徽江淮汽车集团股份有限公司 连续自动落料冲孔复合模及冲压工艺
JP7172763B2 (ja) * 2019-03-14 2022-11-16 トヨタ紡織株式会社 プレス成形装置及びプレス成形方法
CN113102821B (zh) * 2021-04-14 2022-11-15 一汽解放汽车有限公司 切割结构及设有其的切割装置
CN113333617A (zh) * 2021-06-01 2021-09-03 安徽金庐工贸有限公司 一种冲压加工用取料装置
CN113369403B (zh) * 2021-06-29 2022-08-09 罗信精密零件(上海)有限公司 一种圆帽类零件的防脱模卡死的冲压底模

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Publication number Publication date
US20150068375A1 (en) 2015-03-12
EP2848329A1 (fr) 2015-03-18
DE102013015180A1 (de) 2015-03-12
US9919353B2 (en) 2018-03-20
CA2863345C (fr) 2018-10-09
CA2863345A1 (fr) 2015-03-11
JP6345050B2 (ja) 2018-06-20
JP2015054351A (ja) 2015-03-23

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