EP1446247A1 - Device for ejection of moulded pieces from a moulding tool - Google Patents

Device for ejection of moulded pieces from a moulding tool

Info

Publication number
EP1446247A1
EP1446247A1 EP02774242A EP02774242A EP1446247A1 EP 1446247 A1 EP1446247 A1 EP 1446247A1 EP 02774242 A EP02774242 A EP 02774242A EP 02774242 A EP02774242 A EP 02774242A EP 1446247 A1 EP1446247 A1 EP 1446247A1
Authority
EP
European Patent Office
Prior art keywords
spring
guide tube
plunger
ejection
moulding 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.)
Granted
Application number
EP02774242A
Other languages
German (de)
French (fr)
Other versions
EP1446247B1 (en
Inventor
Rudolf Lüthi
Daniel Meier
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.)
Adval Tech Holding AG
Original Assignee
Adval Tech Holding AG
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 Adval Tech Holding AG filed Critical Adval Tech Holding AG
Publication of EP1446247A1 publication Critical patent/EP1446247A1/en
Application granted granted Critical
Publication of EP1446247B1 publication Critical patent/EP1446247B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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
    • B21D45/00—Ejecting or stripping-off devices arranged in machines or tools dealt with in this subclass
    • B21D45/02—Ejecting devices

Definitions

  • the present invention relates to a device for ejecting formed parts, in particular those made of sheet metal, from a forming tool with a plunger movably guided in the forming tool in a guide tube and loaded in the ejection direction by a spring.
  • Such devices are known and are also referred to as feather pillows. Compression springs are regularly used as springs in such spring cushions.
  • the forming tool can e.g. a multi-stage progressive tool consisting of an upper and a lower part in a press.
  • the upper part is installed in the press ram and carries out lifting movements together with it.
  • Modern presses run at high strokes of a few hundred strokes per minute. Between each stroke, the parts to be reshaped e.g. be safely ejected from the top. Production numbers of 100 million pieces per year are not uncommon. Up to now, tool life of around 1/3-year on average has been achieved under such conditions. The wear and tear or failure of the feather pillows proved to be a limiting factor.
  • the invention is based inter alia on the object of a device for ejecting shaped parts from a forming tool with one in the forming tool in one Specify the guide tube in a movably guided plunger which is loaded by a spring in the direction of ejection, which is characterized by a longer service life. According to the invention, this object is achieved in such a device in that a tension spring is used as the spring.
  • the invention is based on the knowledge that the compression springs previously used in the spring cushions tend to radially deflect as soon as they are compressed and that the deflection can become so great that the spring rests on the guide tube. This results in metallic abrasion and ultimately leads to the spring cushion failing.
  • a tension spring instead of a compression spring according to the invention, this problem is advantageously avoided and a longer service life is achieved in the sense of the task at hand.
  • a spiral spring is used as the tension spring and is used such that the guide tube and the tappet are arranged essentially within this spiral spring.
  • threaded plugs are provided for connecting the spring to the guide tube and to the tappet on the guide tube and on the tappet, into which threaded ends are screwed.
  • the tension spring is pulled apart under load.
  • the spring wire is fixed in terms of its pitch on the two threaded plugs. In the transition area from the threaded plug to the free area, this results in a slope and tension jump under load with an uneven load of the spring wire on torsion.
  • the pitch of the thread on the threaded plug is dimensioned according to an average spring pitch, with the mean spring pitch having to be provided such as it has the spring in a middle position of the plunger between its two end positions.
  • 1 denotes the ram of a press, which is itself not shown.
  • 2 designates the upper part of a forming tool attached to the ram 1, 3 the actual forming tool, 4 an already formed sheet metal part and 5 a spring cushion according to the invention inserted into a stepped bore in the press ram 1.
  • the spring cushion 5 in turn comprises a plunger 6, which is displaceable in its longitudinal direction in two sliding guides 7 and 8.
  • the sliding guides 7, 8 are arranged on the inside on a guide tube 9.
  • the guide tube 9 is part of a type of sleeve 10 which also has an outer tube 11.
  • the outer tube 11 opens into a flange 12 which is fixed to a step 13 of the step bore mentioned.
  • the plunger 6 of the spring cushion 5 is prestressed in the ejection direction indicated by the arrow 14 by means of a spiral tension spring 15 which is guided around the plunger 6 on the outside. With its upper end section 16, the spring 15 is screwed onto a stopper 17 and with its lower end section 18 onto the guide tube 9 or into the annular gap between the guide tube 9 and the outer tube 11 of the sleeve 10.
  • the guide tube 9, the outer tube 11 and the sleeve 10 thus also represent a type of lower plug for the spring 15.
  • the drawing shows the 'spring cushion tappet 6 in its fully extended lower end position, in which the spring 15 is least tensioned and therefore has only a slight slope along its central region, where it is free. If the plunger 6 is pressed upward into its upper end position by the spring travel F when the tool is closed, the spring 15 is maximally tensioned and receives the maximum slope in its free area. In a plunger position exactly halfway between the two end positions, the spring 15 naturally has a medium pitch. The spring 15 is fixed on the two plugs by the thread. This changes the pitch of the spring 15 not here at the transition between the two end positions. In order to protect the spring and to keep the gradient difference between its middle, free section and its two end sections as low as possible on average, the slope on the end sections is chosen to be approximately equal to the average slope mentioned.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Springs (AREA)
  • Presses And Accessory Devices Thereof (AREA)
  • Mounting, Exchange, And Manufacturing Of Dies (AREA)
  • Shaping Metal By Deep-Drawing, Or The Like (AREA)

Abstract

The invention relates to a so-called spring cushion (5), for the ejection of moulded pieces (4) from a moulding tool (3), with a plunger (6), moving in a guide tube (9) within the moulding tool and loaded in the ejection direction (14) by means of a spring (15). According to the invention, the spring (15) is embodied as a draw spring, in particular as a spiral draw spring. Considerably longer service life can be achieved as draw springs do not have radial deflections on loading.

Description

BESCHREIBUNG DESCRIPTION
TITELTITLE
Vorrichtung zum Ausstossen von Umformteilen aus einem UmformwerkzeugDevice for ejecting formed parts from a forming tool
TECHNISCHES GEBIETTECHNICAL AREA
Die vorliegende Erfindung betrifft eine Vorrichtung zum Ausstossen von Umformteilen, insbesondere solchen aus Blech, aus einem Umformwerkzeug mit einem in dem Umformwerkzeug in einem Führungsrohr beweglich geführten und in Ausstossrichtung durch eine Feder belasteten Stössel.The present invention relates to a device for ejecting formed parts, in particular those made of sheet metal, from a forming tool with a plunger movably guided in the forming tool in a guide tube and loaded in the ejection direction by a spring.
STAND DER TECHNIKSTATE OF THE ART
Derartige Vorrichtungen sind bekannt und werden auch als Federkissen bezeichnet. Als Federn werden in solchen Federkissen regelmässig Druckfedern eingesetzt.Such devices are known and are also referred to as feather pillows. Compression springs are regularly used as springs in such spring cushions.
Bei dem Umformwerkzeug kann es sich z.B. um ein mehrstufiges, aus einem Ober- und einem Unterteil bestehendes Folgeverbundwerkzeug in einer Presse handeln. Das Oberteil ist hierbei in den Pressenstössel eingebaut und führt zusammen mit diesem Hubbewegungen aus. Moderne Pressen laufen mit hohen Hubzahlen von einigen hundert Hüben pro Minute. Zwischen jedem Hub müssen die umzuformenden Teile z.B. aus dem Oberteil sicher ausgestossen werden. Pro Jahr sind Produktionszahlen von 100 Millionen Stück keine Seltenheit. Bisher konnten unter solchen Bedingungen Werkzeugstandzeiten von durchschnittlich etwa 1/3-Jahr erreicht werden. Die Abnutzung bzw. das Versagen der Federkissen erwies sich hierbei als limitierender Faktor.The forming tool can e.g. a multi-stage progressive tool consisting of an upper and a lower part in a press. The upper part is installed in the press ram and carries out lifting movements together with it. Modern presses run at high strokes of a few hundred strokes per minute. Between each stroke, the parts to be reshaped e.g. be safely ejected from the top. Production numbers of 100 million pieces per year are not uncommon. Up to now, tool life of around 1/3-year on average has been achieved under such conditions. The wear and tear or failure of the feather pillows proved to be a limiting factor.
DARSTELLUNG DER ERFINDUNGPRESENTATION OF THE INVENTION
Der Erfindung liegt unter anderem die Aufgabe zugrunde, eine Vorrichtung zum Ausstossen von Umformteilen aus einem Umformwerkzeug mit einem in dem Umformwerkzeug in einem Führungsrohr in beweglich geführten und in Ausstossrichtung durch eine Feder belasteten Stössel anzugeben, welche sich durch eine höhere Standzeit auszeichnet. Erfindungsgemäss wird diese Aufgabe bei einer solchen Vorrichtung dadurch gelöst, dass als Feder eine Zugfeder verwendet wird.The invention is based inter alia on the object of a device for ejecting shaped parts from a forming tool with one in the forming tool in one Specify the guide tube in a movably guided plunger which is loaded by a spring in the direction of ejection, which is characterized by a longer service life. According to the invention, this object is achieved in such a device in that a tension spring is used as the spring.
Der Erfindung liegt die Erkenntnis zugrunde, dass die in den Federkissen bisher verwendeten Druckfedern zum radialen Auslenken neigen, sobald sie zusammengedrückt werden und dass die Auslenkung so gross werden kann, dass die Feder das Führungsrohr beruht. Dies hat einen metallischen Abrieb zur Folge und führt schlussendlich zum Versagen des Federkissens. Indem nach der Erfindung eine Zugfeder statt einer Druckfeder verwendet wird, wird dieses Problem mit Vorteil vermeiden und es wird im Sinne der gestellten Aufgabe eine längere Standzeit erreicht.The invention is based on the knowledge that the compression springs previously used in the spring cushions tend to radially deflect as soon as they are compressed and that the deflection can become so great that the spring rests on the guide tube. This results in metallic abrasion and ultimately leads to the spring cushion failing. By using a tension spring instead of a compression spring according to the invention, this problem is advantageously avoided and a longer service life is achieved in the sense of the task at hand.
Gemäss einer ersten bevorzugten Ausführungsform der Erfindung wird als Zugfeder eine Spiralfeder verwendet und so eingesetzt, dass das Führungsrohr und der Stössel im wesentlichen innerhalb dieser Spiralfeder angeordnet sind.According to a first preferred embodiment of the invention, a spiral spring is used as the tension spring and is used such that the guide tube and the tappet are arranged essentially within this spiral spring.
Gemäss einerweiteren bevorzugten Ausführungsform werden zur Anbindung der Feder an das Führungsrohr und an den Stössel am Führungsrohr und am Stössel jeweils Gewindestopfen vorgesehen, in welche in die Federenden eingeschraubt werden.According to a further preferred embodiment, threaded plugs are provided for connecting the spring to the guide tube and to the tappet on the guide tube and on the tappet, into which threaded ends are screwed.
Unter Belastung wird die Zugfeder auseinandergezogen. Auf den beiden Gewindestopfen ist der Federdraht bezüglich seiner Steigung jedoch festgelegt. Im Übergangsbereich von den Gewindestopfen zum freien Bereich ergibt sich dadurch unter Belastung ein Steigungs- und Spannungssprung mit einer ungleichen Belastung des Federdrahtes auf Torsion. Um diese Unstetigkeit der Federbeiastung abzumildern und eine höhere Federlebensdauer zu erreichen, ist es gemäss einer noch weiteren Ausführungsform der Erfindung vorgesehen, dass die Steigung des Gewindes auf den Gewindestopfen einer mittleren Federsteigung entsprechend bemessen wird, wobei als mittlere Federsteigung eine solche zu versehen ist, wie sie die Feder bei einer mittleren Stellung des Stössels zwischen seinen beiden Endstellungen aufweist.The tension spring is pulled apart under load. However, the spring wire is fixed in terms of its pitch on the two threaded plugs. In the transition area from the threaded plug to the free area, this results in a slope and tension jump under load with an uneven load of the spring wire on torsion. In order to alleviate this discontinuity of the spring load and to achieve a longer spring service life, according to yet another embodiment of the invention, it is provided that the pitch of the thread on the threaded plug is dimensioned according to an average spring pitch, with the mean spring pitch having to be provided such as it has the spring in a middle position of the plunger between its two end positions.
Mit Federkissen gemäss der vorliegenden Erfindung konnten Werkzeugstandzeiten bei den genannten Produktionsfrequezen von gut einem Jahr erreicht werden. KURZE ERLÄUTERUNG DER FIGURENWith spring cushions according to the present invention, tool service lives of at least one year could be achieved at the production frequencies mentioned. BRIEF EXPLANATION OF THE FIGURES
Die Erfindung soll nachfolgend anhand von Ausführungsbeispielen im Zusammenhang mit der Zeichnung näher erläutert werden. Die Zeichnung zeigt im Schnitt ein erfindungsgemässes Federkissen im eingebauten Zustand.The invention will be explained in more detail below on the basis of exemplary embodiments in connection with the drawing. The drawing shows in section an inventive spring cushion in the installed state.
WEGE ZUR AUSFÜHRUNG DER ERFINDUNGWAYS OF CARRYING OUT THE INVENTION
In der Zeichung bezeichnet 1 den Stössel einer Presse, die selbst nicht dargestellt ist. 2 bezeichnet das an dem Stössel 1 befestige Oberteil eines Umforrhwerkzeugs, 3 das eigentliche Umformwerkzeug, 4 ein bereits schon umgeformtes Blechteil und 5 ein in eine Stufenbohrung im Pressenstössel 1 eingesetztes Federkissen nach der Erfindung.In the drawing, 1 denotes the ram of a press, which is itself not shown. 2 designates the upper part of a forming tool attached to the ram 1, 3 the actual forming tool, 4 an already formed sheet metal part and 5 a spring cushion according to the invention inserted into a stepped bore in the press ram 1.
Das Federkissen 5 umfasst seinerseits einen Stössel 6, welcher in zwei Gleitführungen 7 und 8 in seiner Längsrichtung verschiebbar ist. Die Gleitführungen 7, 8 sind innenseitig an einem Führungsrohr 9 angeordnet. Das Führungsrohr 9 ist Teil einer Art Muffe 10, die noch ein Aussenrohr 11 aufweist. Das Aussenrohr 11 mündet in einen Flansch 12, der an einer Stufe 13 der erwähnten Stufenbohrung festgelegt ist.The spring cushion 5 in turn comprises a plunger 6, which is displaceable in its longitudinal direction in two sliding guides 7 and 8. The sliding guides 7, 8 are arranged on the inside on a guide tube 9. The guide tube 9 is part of a type of sleeve 10 which also has an outer tube 11. The outer tube 11 opens into a flange 12 which is fixed to a step 13 of the step bore mentioned.
Vorgespannt in der durch den Pfeil 14 gekennzeichneten Ausstossrichtung ist der Stössel 6 des Federkissens 5 durch eine Spiral-Zugfeder 15, welche aussen um den Stössel 6 herumgeführt ist. Mit ihrem oberen Endabschnitt 16 ist die Feder 15 auf einen Stopfen 17 und mit ihrem unteren Endabschnitt 18 auf das Führungsrohr 9 auf- bzw. in den ringförmigen Spalt zwischen Führungsrohr 9 und Aussenrohr 11 der Muffe 10 eingeschraubt. Das Führungsrohr 9, das Aussenrohr 11 bzw. die Muffe 10 stellen damit für die Feder 15 ebenfalls eine Art unterer Stopfen dar.The plunger 6 of the spring cushion 5 is prestressed in the ejection direction indicated by the arrow 14 by means of a spiral tension spring 15 which is guided around the plunger 6 on the outside. With its upper end section 16, the spring 15 is screwed onto a stopper 17 and with its lower end section 18 onto the guide tube 9 or into the annular gap between the guide tube 9 and the outer tube 11 of the sleeve 10. The guide tube 9, the outer tube 11 and the sleeve 10 thus also represent a type of lower plug for the spring 15.
Die Zeichnung zeigt den' Federkissen-Stössel 6 in seiner ganz ausgefahrenen unteren Endstellung, in welcher die Feder 15 am wenigsten gespannt ist und deshalb nur eine geringe Steigung entlang ihres mittleren Bereichs aufweist, wo sie frei ist. Wird der Stössel 6 beim Schliessen des Werkzeugs um den Federweg F nach oben in seine obere Endsteliung gedrückt, wird die Feder 15 maximal gespannt und erhält in ihrem freien Bereich die maximale Steigung. In einer Stösselstellung auf genau halber Strecke zwischen den beiden Endstellungen weist die Feder 15 natürlich eine mittlere Steigung auf. Auf den beiden Stopfen ist die Feder 15 durch das Gewinde festgelegt. Dadurch ändert sich die Steigung der Feder 15 hier beim Übergang zwischen den beiden Endstellungen nicht. Um die Feder zu schonen und den Steigungsunterschied zwischen ihrem mittleren, freien Abschnitt und ihren beiden Endabschnitten im Mittel möglichst gering zu halten, ist die Steigung auf den Endabschnitten etwa gleich der erwähnten mittleren Steigung gewählt. The drawing shows the 'spring cushion tappet 6 in its fully extended lower end position, in which the spring 15 is least tensioned and therefore has only a slight slope along its central region, where it is free. If the plunger 6 is pressed upward into its upper end position by the spring travel F when the tool is closed, the spring 15 is maximally tensioned and receives the maximum slope in its free area. In a plunger position exactly halfway between the two end positions, the spring 15 naturally has a medium pitch. The spring 15 is fixed on the two plugs by the thread. This changes the pitch of the spring 15 not here at the transition between the two end positions. In order to protect the spring and to keep the gradient difference between its middle, free section and its two end sections as low as possible on average, the slope on the end sections is chosen to be approximately equal to the average slope mentioned.
BEZEICHNUNGSLISTENAME LIST
1 Stössel einer Presse1 ram of a press
2 Oberteil eines Umformwerkzeugs2 Top part of a forming tool
3 ein Umformwerkzeug ein bereits schon umgeformtes Biechteil3 a forming tool an already formed sheet metal part
5 Federkissen5 feather pillows
Stössel , 8 GleitführungenRam, 8 sliding guides
9 Führungsrohr9 guide tube
10 Muffe10 sleeve
11 Aussenrohr11 outer tube
12 Flansch12 flange
13 Stufe13 level
14 Pfeil14 arrow
15 Spiral-Zugfede15 Spiral tension spring
16 oberer Endabschnitt16 upper end section
17 Stopfen17 plugs
18 unterer Endabschnitt 18 lower end section

Claims

PATENTANSPRÜCHE
1. Vorrichtung zum Ausstossen von Umformteilen (4) aus einem Umformwerkzeug (3) mit einem in dem Umformwerkzeug (3) in einem Führungsrohr (9) beweglich geführten und in Ausstossrichtung (14) durch eine Feder (15) belasteten Stössel (6), dadurch gekennzeichnet, dass die Feder (15) eine Zugfeder ist.1.Device for ejecting formed parts (4) from a forming tool (3) with a plunger (6) movably guided in the forming tool (3) in a guide tube (9) and loaded in the ejection direction (14) by a spring (15), characterized in that the spring (15) is a tension spring.
2. Vorrichtung nach einem der Ansprüche 1 oder 2, dadurch gekennzeichnet, dass die Zugfeder (15) eine Spiralfeder ist und dass das Führungsrohr (9) und der Stössel (6) im wesentlichen innerhalb dieser Spiralfeder (15) angeordnet sind.2. Device according to one of claims 1 or 2, characterized in that the tension spring (15) is a spiral spring and that the guide tube (9) and the plunger (6) are arranged essentially within this spiral spring (15).
3. Vorrichtung nach Anspruch 2, dadurch gekennzeichnet, dass zur Anbindung der Feder (15) an das Führungsrohr (9) und an den Stössel (6) am Führungsrohr (9) und am Stössel (6) jeweils Gewindestopfen (17, 10) vorgesehen sind, welche in die Federenden jeweils eingeschraubt sind.3. Device according to claim 2, characterized in that for the connection of the spring (15) to the guide tube (9) and to the tappet (6) on the guide tube (9) and on the tappet (6) each threaded plug (17, 10) is provided are, which are screwed into the spring ends.
4. Vorrichtung nach Anspruch 3, dadurch gekennzeichnet, dass die Feder (15) bei einer mittleren Stellung des Stössels (6) eine mittlere Steigung aufweist und dass die Steigung des Gewindes auf den Gewindestopfen (17, 10) jeweils dieser mittleren Federsteigung entspricht. 4. The device according to claim 3, characterized in that the spring (15) with a central position of the plunger (6) has a medium pitch and that the pitch of the thread on the threaded plug (17, 10) corresponds to this average spring pitch.
EP02774242A 2001-11-22 2002-11-19 Device for ejection of moulded pieces from a moulding tool Expired - Lifetime EP1446247B1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
CH21562001 2001-11-22
CH215601 2001-11-22
PCT/CH2002/000622 WO2003043759A1 (en) 2001-11-22 2002-11-19 Device for ejection of moulded pieces from a moulding tool

Publications (2)

Publication Number Publication Date
EP1446247A1 true EP1446247A1 (en) 2004-08-18
EP1446247B1 EP1446247B1 (en) 2007-06-27

Family

ID=4567736

Family Applications (1)

Application Number Title Priority Date Filing Date
EP02774242A Expired - Lifetime EP1446247B1 (en) 2001-11-22 2002-11-19 Device for ejection of moulded pieces from a moulding tool

Country Status (7)

Country Link
US (1) US7254979B2 (en)
EP (1) EP1446247B1 (en)
JP (1) JP2005509524A (en)
KR (1) KR20040066840A (en)
CN (1) CN1270843C (en)
DE (1) DE50210394D1 (en)
WO (1) WO2003043759A1 (en)

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CN102363176A (en) * 2011-06-29 2012-02-29 天津汽车模具股份有限公司 Buffer type limit plate for limiting stroke of automobile mould
CN102794383B (en) * 2012-08-13 2015-04-15 苏州工业园区新凯精密五金有限公司 Receiving main mould structure of returning ejector pins in step-type product
CN103331388A (en) * 2013-07-03 2013-10-02 合肥亿恒机械有限公司 Novel material ejection mechanism
CN103803794B (en) * 2014-02-26 2016-08-24 广州市南亚纸浆模塑设备有限公司 The stamping cavity die that a kind of structure is improved
CN104014681A (en) * 2014-06-27 2014-09-03 成都丽元电器有限公司 Novel spring type material taking device
CN106944569A (en) * 2017-03-15 2017-07-14 无锡市翱宇特新科技发展有限公司 A kind of material jacking mechanism of metal stamping die
CN108723278A (en) * 2018-05-11 2018-11-02 盐城杰精机械制造有限公司 A kind of riveting machine
CN109482743B (en) * 2018-11-24 2024-03-22 鑫望威科技有限公司 Automobile door mold and use method
CN110727118A (en) * 2019-10-22 2020-01-24 中国人民解放军第四军医大学 Orthopedics doctor who conveniently adjusts sees piece device

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Also Published As

Publication number Publication date
CN1270843C (en) 2006-08-23
EP1446247B1 (en) 2007-06-27
DE50210394D1 (en) 2007-08-09
KR20040066840A (en) 2004-07-27
US20040255636A1 (en) 2004-12-23
CN1585680A (en) 2005-02-23
AU2002340702A1 (en) 2003-06-10
US7254979B2 (en) 2007-08-14
JP2005509524A (en) 2005-04-14
WO2003043759A1 (en) 2003-05-30

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