EP0196308A1 - Ejecteur pour presses a excentrique - Google Patents

Ejecteur pour presses a excentrique

Info

Publication number
EP0196308A1
EP0196308A1 EP85904417A EP85904417A EP0196308A1 EP 0196308 A1 EP0196308 A1 EP 0196308A1 EP 85904417 A EP85904417 A EP 85904417A EP 85904417 A EP85904417 A EP 85904417A EP 0196308 A1 EP0196308 A1 EP 0196308A1
Authority
EP
European Patent Office
Prior art keywords
curve
ejector
pin
stroke
ejector pin
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.)
Withdrawn
Application number
EP85904417A
Other languages
German (de)
English (en)
Inventor
Alois Weller
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.)
TH Kieserling and Albrecht GmbH and Co
Original Assignee
TH Kieserling and Albrecht GmbH and Co
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by TH Kieserling and Albrecht GmbH and Co filed Critical TH Kieserling and Albrecht GmbH and Co
Publication of EP0196308A1 publication Critical patent/EP0196308A1/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21J—FORGING; HAMMERING; PRESSING METAL; RIVETING; FORGE FURNACES
    • B21J13/00—Details of machines for forging, pressing, or hammering
    • B21J13/08—Accessories for handling work or tools
    • B21J13/14—Ejecting devices

Definitions

  • the invention relates to an ejector mechanism according. the preamble of claim 1.
  • the preferred field of application of the invention is multi-stage presses for the production of preferably short, metallic workpieces, such as bolts, screws, sleeves etc.
  • a ram-side ejector which has to eject the workpiece when the slide returns. Strict requirements are placed on the ejection process.
  • the ejected workpiece must be held in the die in the same position as in the foremost position of the slide.
  • the transport device can only grip the workpiece when the carriages attached to the carriage have withdrawn. In the period between the front dead center of the slide and the blank being gripped by the transport device, the blank must be held in an unchanged position by a stamp-side ejector in order to ensure correct positioning of the blank in front of the next die.
  • a multi-stage press which has an ejector mechanism with an ejector pin on the die side.
  • the ejector pin is operated by a lever which is articulated on the carriage.
  • the free end of the lever protruding from the slide slides over a curve on the machine frame when the slide is lifted.
  • the curve consists of two areas that ensure that the ejector stands still relative to the slide and an area in between that causes the actual ejection.
  • this ejector mechanism has the disadvantage that, due to the displacement of the curve in the stroke direction of the slide, the workpiece cannot come to a standstill during the ejection process, relative to the machine frame.
  • the object of the invention is to create an ejection mechanism which ensures that the workpiece stands still in relation to the die in the ejection phase, that is to say when the slide begins to return, and which at the same time permits any adjustment of the stroke length within the scope of the areas to be demanded .
  • the curve is unchanged in the ejection phase, both in terms of its course and in terms of your location.
  • the ejection phase is ended by steering the curve away, the curve is "broken off" at the rear.
  • the control device serves this purpose. It is hinged to the machine frame.
  • a return spring in the ejector mechanism brings the ejector pin into its rearward position.
  • the curve is preferably steered away transversely to the direction of the stroke movement of the carriage, since this makes the distance for steering the curve shorter.
  • the solution according to the invention has the advantage that the ejector pin returns to its rearward position at an early stage.
  • a protruding ejector pin in the working phase of the sled stroke can be used for Reverse extrusion lead to breakage. Therefore, the ejector pin is always in its rearward position when the carriage moves forward, according to the invention.
  • the embodiment pursued with claim 2 is preferably provided in the invention.
  • the curve formed on the rocker arm ensures that the ejector pin comes to a standstill relative to the machine frame in the ejection phase. It is tilted away as soon as it is ensured that the workpiece remains in the die.
  • control device On the movable side of the rocker arm with the curve, this is supported by the control device.
  • the control device can have different configurations, insofar as they work quickly and precisely enough and can transmit the forces that occur.
  • control curve is another curve in addition to the aforementioned curve. It does not determine the course of the ejection process, but specifically initiates its termination. This is the moment at which the ejection process for the workpiece is stopped. It also ensures that the rocker arm and lever are brought together shortly before the start of the working stroke.
  • the stroke length of the ejector is adapted to the needs of the forming process by changing the control curve.
  • the control curve according to Claim 4 in two parts. It has, as expressed in claim 5, two areas with an unchanged stroke position, which correspond to the phases of ejection and the remaining cycle time. Suitable transitions are provided in between. The two
  • Replacement sheet Parts of the control curve are designed such that each part carries slightly more than half of one of the areas mentioned, so that the partial areas, as pursued by claim 6, overlap.
  • the length of the ejector stroke is changed by changing the degree of overlap.
  • Fig. 1 A section through a multi-stage press
  • Fig. 2 a section as in Fig. 1 but with a
  • Fig. 4 a detail of Fig. 3 on an enlarged scale.
  • the multi-stage press shown in Fig. V consists of a machine frame 1, a slide 2, a tool 5 that receives a workpiece 4, a punch-side ejector pin 3, a lever 6 for actuating the ejector pin 3, a connecting rod 21, one Curve 7, on which the lever 6 is guided and a control device 8, which moves the rocker arm 9, on which the curve 7 is guided.
  • Grippers 33 transport the workpieces between the individual tools 5 of the multi-stage press.
  • the ejector pin 3 guided in the carriage has a head 28, against which a return spring 23 bears, which is supported opposite on a sleeve 32 fastened in the carriage.
  • the ejector pin 3 In its position shown in FIG. 1, the ejector pin 3 is flush with the bottom 31 of the tool 5.
  • the lever 6 is rotatably mounted with the joint 24 on the slide 2. It rests on the one hand on the head 28 of the ejector pin 3 and is supported on a curve 7 with its end protruding from the slide 2.
  • the rocker arm 9 bearing the curve 7 is fastened to the machine frame 1 with a joint 16.
  • the position 29 of the rocker arm 9 is constant for the phase of ejecting the workpiece 4 from the tool 5.
  • the rocker arm is pressed by the control device 8 with a nose 27 against a stop 26 on the machine frame side.
  • the curve 7 is designed such that the ejector pin 3 is at a standstill relative to the machine frame 1.
  • This type of ejector is also known as a "synchronous ejector".
  • the ejector pin 3 On the return stroke of the carriage 2, the ejector pin 3 initially remains in an unchanged position relative to the machine frame 1, so that the pressed workpiece 4 remains in the die 34 until the die-side tool 5 has released the workpiece 4 (FIG. 2).
  • the workpiece 4 cannot slip between the die 34 and the ejector pin and, precisely positioned, is fed by the grippers 33 to the next die.
  • the pusher has then fulfilled its task and returns to its position relative to the carriage 2, as shown in FIG. 1.
  • the rocker arm 9 and with it the curve 7 are lowered into the position 30.
  • the lowering of the rocker arm 9 with the curve 7 is provided by the control device 8, the control pin 25 of which is retracted for this purpose.
  • the predetermined path of the lever 6 and thus the ejector pin 3 is independent of the length of the desired ejection stroke.
  • the ejection process is only interrupted at different times, which correspond to different stroke lengths and which are determined by the control device 8.
  • Curve 7 is not preset for a desired ejector stroke. This ensures that the same piece of curve 7 always ensures the ejection process and the stroke length of the ejector pin 3 has no influence on the position of the curve relative to the machine frame.
  • curve 7 is not a straight line; rather, its geometry corresponds exactly to the requirements of the aforementioned standstill of the ejector pin 3 relative to the machine frame 2 and takes into account the pivoting movement of the lever 6
  • the stroke length of the ejector pin 3 results from the setting of the control device 8.
  • This has a rotating control cam 10, which brings the latter into the respectively required position 29 or 30 via a roller 18 on the rocker arm 9.
  • the control curve 10 has a region 13 with a constant radius, which holds the rocker arm 9 and the curve 7 in the position 29.
  • the cam area 14 comes to rest against the roller 18.
  • a spring 17 and the return spring 23 bring the Ejector pin 3 in the rear position, which corresponds to the position 30 of the rocker arm 9.
  • the control curve 10 is formed in two parts in FIGS. 3 and 4. Their parts 11 and 12 complement each other so that the areas 13 and 14 are each formed by a section of the control curve on one and on the other part.
  • the transition from area 14 to area 13 is formed on part 11, the transition from area 13 to area 14 is formed on part 12.
  • the length of the area 13 is proportional to the stroke length of the ejector.
  • the degree of overlap is changed by pivoting the parts 11 and 12 against one another on the shaft 35.
  • an elongated hole is provided in the disk 12, through which a screw 20 passes.
  • the screw 20 secures the relative position of the parts 11 and 12 to one another.
  • the carriage begins the return stroke.
  • the ejector pin 3 does not initially follow the path of the slide 2 but remains unchanged, i.e. at rest relative to

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Press Drives And Press Lines (AREA)
  • Handling Of Sheets (AREA)
  • Forging (AREA)

Abstract

La cheville (3) de l'éjecteur est formée dans le coulisseau (2) et elle s'appuie par un levier (6) sur une came (7) du bâti de la presse (1). La came (7) a une forme telle qu'elle permet un arrêt de la cheville par rapport au bâti de la presse (1) pendant la phase d'éjection. La pièce à usiner (4) est tenue, pendant cette phase, dans une position inchangée entre la matrice (34) et la cheville de l'éjecteur (3). Le mouvement d'éjection est tronqué en abaissant la came (7) par le dispositif de commande (8), la cheville de l'éjecteur (3) revient alors dans sa position retirée par rapport au coulisseau (2) et reste dans sa position retirée pendant la partie restante de la course de retour. Le réglage de la course a lieu dans le dispositif de commande (8); il est prévu à cet effet une came de commande (10) constituée de plusieurs parties (11, 12) qui peuvent être pivotées l'une par rapport à l'autre et l'une dans l'autre. Elles déterminent ainsi la longueur efficace de la zone (13) qui commande l'interruption au moment opportun de la course de l'éjecteur.
EP85904417A 1984-10-11 1985-08-23 Ejecteur pour presses a excentrique Withdrawn EP0196308A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3437282 1984-10-11
DE19843437282 DE3437282A1 (de) 1984-10-11 1984-10-11 Ausstossermechanismus fuer exzenterpressen

Publications (1)

Publication Number Publication Date
EP0196308A1 true EP0196308A1 (fr) 1986-10-08

Family

ID=6247632

Family Applications (1)

Application Number Title Priority Date Filing Date
EP85904417A Withdrawn EP0196308A1 (fr) 1984-10-11 1985-08-23 Ejecteur pour presses a excentrique

Country Status (5)

Country Link
US (1) US4720990A (fr)
EP (1) EP0196308A1 (fr)
JP (1) JPS62500645A (fr)
DE (1) DE3437282A1 (fr)
WO (1) WO1986002297A1 (fr)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3904278A1 (de) * 1989-02-14 1990-08-16 Schuler Gmbh L Antrieb fuer einen in einem stoessel einer mechanischen umformpresse verschieblich gelagerten, patrizenseitigen auswerfer
DE3911061A1 (de) * 1989-04-06 1990-10-11 Istvan Bartha Federnde druckhuelse mit formkopf
IT1303027B1 (it) * 1998-04-17 2000-10-20 Carlo Salvi & C S R L Dispositivo di regolazione per la formatura di minuterie metalliche
JP3387842B2 (ja) * 1999-01-11 2003-03-17 株式会社安川電機 電子カム方式ロータリカッタ制御方法および電子カム曲線生成方法
DE10208720B4 (de) * 2002-02-28 2005-11-03 Wafios Ag Stempelseitige Auswerfvorrichtung für Werkstücke bei Ein- oder Mehrstufenpressen
CN110715851A (zh) * 2019-12-10 2020-01-21 安徽鼎元新材料有限公司 一种pir聚异氰尿酸脂制品的抗压强度检测装置

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL301772A (fr) * 1963-12-13
DE1254437B (de) * 1964-04-10 1967-11-16 Fritz Bernhard Hatebur Vorrichtung zur Steuerung von Hilfselementen, wie Pressschlittenauswerfer, Pressschlittenfuehrungshuelse od. dgl. fuer Doppeldruck- und Mehrstufenpressen
DE1627977B2 (de) * 1967-02-06 1978-01-05 Vyzkumny ustav tvarecich stroju a technologie tvareni, Brunn (Tschechoslowakei) Auswerfvorrichtung an einer mechanischen presse
NL6704472A (fr) * 1967-03-29 1968-09-30
JPS5220188B2 (fr) * 1973-10-24 1977-06-01
DE2812695C3 (de) * 1978-03-23 1981-02-19 Hatebur Umformmaschinen Ag, Basel (Schweiz) Vorrichtung zum stempelseitigen Auswerfen eines Preßlings auf einer Querförderpresse zur spanlosen Metallumformung
DE2827561C2 (de) * 1978-06-23 1985-08-29 Th. Kieserling & Albrecht Gmbh & Co, 5650 Solingen Kurbelpresse mit stempelseitigem Auswerfer
DE3322944C2 (de) * 1983-06-25 1987-03-19 Eumuco Aktiengesellschaft für Maschinenbau, 5090 Leverkusen Matrizenauswerfer-Vorrichtung für Mehrstufen-Umformmaschinen

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO8602297A1 *

Also Published As

Publication number Publication date
WO1986002297A1 (fr) 1986-04-24
JPS62500645A (ja) 1987-03-19
DE3437282A1 (de) 1986-04-17
US4720990A (en) 1988-01-26

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Inventor name: WELLER, ALOIS