EP1446247B1 - Device for ejection of moulded pieces from a moulding tool - Google Patents
Device for ejection of moulded pieces from a moulding tool Download PDFInfo
- Publication number
- EP1446247B1 EP1446247B1 EP02774242A EP02774242A EP1446247B1 EP 1446247 B1 EP1446247 B1 EP 1446247B1 EP 02774242 A EP02774242 A EP 02774242A EP 02774242 A EP02774242 A EP 02774242A EP 1446247 B1 EP1446247 B1 EP 1446247B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- spring
- plunger
- guide tube
- pitch
- ejection
- 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 - Lifetime
Links
- 238000000465 moulding Methods 0.000 title 1
- 210000003746 feather Anatomy 0.000 description 6
- 230000006835 compression Effects 0.000 description 3
- 238000007906 compression Methods 0.000 description 3
- 239000002184 metal Substances 0.000 description 3
- 230000007704 transition Effects 0.000 description 2
- 238000005299 abrasion Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000000750 progressive effect Effects 0.000 description 1
Images
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 movable in the forming tool in a guide tube and in the ejection direction by a spring loaded ram (see, eg DE-A-40 28 425 ).
- feather pillows Such devices are known and are also referred to as feather pillows. As feathers are regularly used in such feather pillows compression springs.
- the forming tool may be e.g. to act in a press a multi-stage, consisting of an upper and a lower part progressive tool.
- the upper part is in this case installed in the press ram and performs lifting movements together with it.
- Modern presses run with high stroke rates of a few hundred strokes per minute. Between each stroke, the parts to be formed, e.g. be ejected safely from the top. Production figures of 100 million units per year are not uncommon. Up to now, tool life of about 1/3-year could be achieved under such conditions. The wear or failure of the feather pillows proved to be a limiting factor.
- the invention is inter alia the object of a device for ejecting formed parts from a forming tool with a in the forming tool in a Specify guide tube in movably guided and in the ejection direction by a spring loaded ram, 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 a spring.
- the invention is based on the finding that the compression springs previously used in the spring cushion tend to deflect radially as soon as they are compressed and that the deflection can be so great that the spring contacts the guide tube. This results in a metallic abrasion and ultimately leads to failure of the spring cushion.
- a tension spring is used instead of a compression spring, this problem will be avoided with advantage and it is achieved in accordance with the task a longer life.
- a coil spring is used as a tension spring and used so that the guide tube and the plunger are arranged substantially within this coil spring.
- threaded plugs are provided for connecting the spring to the guide tube and to the plunger on the guide tube and on the plunger, into which screwed into the spring ends.
- the pitch of the thread on the threaded plug of a central spring pitch is dimensioned accordingly, being provided as an average spring pitch such as it has the spring at a middle position of the plunger between its two end positions.
- 1 denotes the plunger of a press, which is not shown itself.
- 2 designates the upper part of a forming tool attached to the ram 1, 3 the actual forming tool, 4 a sheet metal part which has already been formed, and 5 a spring pillow according to the invention inserted in a stepped bore in the press ram 1.
- the spring cushion 5 in turn comprises a plunger 6, which is displaceable in two sliding guides 7 and 8 in its longitudinal direction.
- 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 still has an outer tube 11.
- the outer tube 11 opens into a flange 12 which is fixed to a step 13 of the mentioned stepped bore.
- the drawing shows the spring-pad plunger 6 in its fully extended lower end position, in which the spring 15 is the least tensioned and therefore has only a small slope along its central region, where it is free. If the plunger 6 is pressed when closing the tool by the spring travel F up to its upper end position, the spring 15 is stretched maximum and receives in its free area, the maximum slope. In a ram position exactly halfway between the two end positions, the spring 15 naturally has an average pitch. On the two plugs, the spring 15 is fixed by the thread. This changes the pitch of the spring 15 here at the transition between the two end positions not. In order to preserve the spring and to keep the slope difference between its middle, free section and its two end sections as low as possible on the average, the slope on the end sections is chosen approximately equal to the mentioned average slope.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Springs (AREA)
- Presses And Accessory Devices Thereof (AREA)
- Shaping Metal By Deep-Drawing, Or The Like (AREA)
- Mounting, Exchange, And Manufacturing Of Dies (AREA)
Description
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 (siehe z.B.
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. As feathers are regularly used in such feather pillows compression springs.
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 may be e.g. to act in a press a multi-stage, consisting of an upper and a lower part progressive tool. The upper part is in this case installed in the press ram and performs lifting movements together with it. Modern presses run with high stroke rates of a few hundred strokes per minute. Between each stroke, the parts to be formed, e.g. be ejected safely from the top. Production figures of 100 million units per year are not uncommon. Up to now, tool life of about 1/3-year could be achieved under such conditions. The wear or failure of the feather pillows proved to be a limiting factor.
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 inter alia the object of a device for ejecting formed parts from a forming tool with a in the forming tool in a Specify guide tube in movably guided and in the ejection direction by a spring loaded ram, 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 a 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 berüht. 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 finding that the compression springs previously used in the spring cushion tend to deflect radially as soon as they are compressed and that the deflection can be so great that the spring contacts the guide tube. This results in a metallic abrasion and ultimately leads to failure of the spring cushion. By according to the invention, a tension spring is used instead of a compression spring, this problem will be avoided with advantage and it is achieved in accordance with the task a longer life.
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 coil spring is used as a tension spring and used so that the guide tube and the plunger are arranged substantially within this coil spring.
Gemäss einer weiteren 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 plunger on the guide tube and on the plunger, into which screwed into the spring ends.
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 Federbelastung 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.Under load, the tension spring is pulled apart. However, the spring wire is fixed in terms of its pitch on the two threaded plugs. In the transition region from the threaded plug to the free area, this results in an increase in pitch and stress with an unequal loading of the spring wire on torsion under load. To mitigate this discontinuity of the spring load and to achieve a longer spring life, it is provided according to a still further embodiment of the invention that the pitch of the thread on the threaded plug of a central spring pitch is dimensioned accordingly, being provided as an average spring pitch such as it has the spring at 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.With spring cushions according to the present invention tool life could be achieved at the mentioned Produktionsfrequezen of well over a year.
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 with reference to embodiments in conjunction with the drawings. The drawing shows in section an inventive feather pillow in the installed state.
In der Zeichung bezeichnet 1 den Stössel einer Presse, die selbst nicht dargestellt ist. 2 bezeichnet das an dem Stössel 1 befestige Oberteil eines Umformwerkzeugs, 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 plunger of a press, which is not shown itself. 2 designates the upper part of a forming tool attached to the
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
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.Prestressed in the direction indicated by the
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 Endstellung 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-
- 11
- Stössel einer PressePestle of a press
- 22
- Oberteil eines UmformwerkzeugsTop part of a forming tool
- 33
- ein Umformwerkzeuga forming tool
- 44
- ein bereits schon umgeformtes Blechteilan already formed sheet metal part
- 55
- Federkissenfeather pillows
- 66
- Stösseltappet
- 7, 87, 8
- Gleitführungensliding guides
- 99
- Führungsrohrguide tube
- 1010
- Muffesleeve
- 1111
- Aussenrohrouter tube
- 1212
- Flanschflange
- 1313
- Stufestep
- 1414
- Pfeilarrow
- 1515
- Spiral-ZugfedeSpiral Zugfede
- 1616
- oberer Endabschnittupper end section
- 1717
- StopfenPlug
- 1818
- unterer Endabschnittlower end section
Claims (4)
- A device for ejecting formed parts (4) from a forming die (3), having a plunger (6) movably guided in the forming die (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.
- The device as claimed in either of claims 1 or 2, characterized in that the tension spring (15) is a helical spring, and in that the guide tube (9) and the plunger (6) are arranged essentially inside this helical spring (15).
- The device as claimed in claim 2, characterized in that, to attach the spring (15) to the guide tube (9) and to the plunger (6), screw plugs (17, 10) are provided in each case on the guide tube (9) and on the plunger (6), which screw plugs (17, 10) are in each case screwed into the spring ends.
- The device as claimed in claim 3, characterized in that the spring (15), in a center position of the plunger (6), has an average pitch, and in that the pitch of the thread on the screw plugs (17, 10) in each case corresponds to this average spring pitch.
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 EP1446247A1 (en) | 2004-08-18 |
| EP1446247B1 true 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) |
Families Citing this family (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7765847B2 (en) * | 2006-11-02 | 2010-08-03 | Flextronics Ap, Llc | Modular power pack assembly |
| CN101885033B (en) * | 2009-05-11 | 2012-08-29 | 福光企业股份有限公司 | Jacking and guiding device of forging product forming machine |
| 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 |
Family Cites Families (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US445238A (en) * | 1891-01-27 | Machinery for forming car-wheels | ||
| US1721283A (en) * | 1927-07-30 | 1929-07-16 | Burdsall & Ward Co | Swaging machine |
| US1977163A (en) * | 1933-07-22 | 1934-10-16 | Waterbury Farrel Foundry Co | Die mechanism |
| US2227524A (en) * | 1938-11-08 | 1941-01-07 | Hazel Atlas Glass Co | Apparatus for manufacturing closures |
| US2329325A (en) * | 1943-03-01 | 1943-09-14 | Sherman E Berry | Machine for reshaping bottle caps |
| CH295447A (en) | 1951-04-30 | 1953-12-31 | Ag L Schuler | Ejection device on a press. |
| DE1142149B (en) | 1962-01-08 | 1963-01-10 | Schuler L Ag | Ejector on sheet metal presses |
| NL6704471A (en) * | 1967-03-29 | 1968-09-30 | ||
| US3620113A (en) * | 1969-09-08 | 1971-11-16 | Dayton Progress Corp | Ejector type punch |
| US3911719A (en) * | 1974-12-02 | 1975-10-14 | Ragsdale Brothers Inc | High speed ejector mechanism |
| US4887448A (en) * | 1988-06-21 | 1989-12-19 | Teledyne Industries Inc. | Knockout pin apparatus |
| DE4028425A1 (en) | 1990-09-07 | 1992-03-12 | Alcoa Gmbh Verpackwerke | Prodn. of closures by deep drawing of circular blanks - involves using compressed air to eject finished closures from tools |
-
2002
- 2002-11-19 DE DE50210394T patent/DE50210394D1/en not_active Expired - Fee Related
- 2002-11-19 CN CNB028225791A patent/CN1270843C/en not_active Expired - Fee Related
- 2002-11-19 KR KR10-2004-7007815A patent/KR20040066840A/en not_active Application Discontinuation
- 2002-11-19 US US10/495,026 patent/US7254979B2/en not_active Expired - Fee Related
- 2002-11-19 EP EP02774242A patent/EP1446247B1/en not_active Expired - Lifetime
- 2002-11-19 WO PCT/CH2002/000622 patent/WO2003043759A1/en active IP Right Grant
- 2002-11-19 JP JP2003545426A patent/JP2005509524A/en not_active Ceased
Also Published As
| Publication number | Publication date |
|---|---|
| CN1585680A (en) | 2005-02-23 |
| JP2005509524A (en) | 2005-04-14 |
| WO2003043759A1 (en) | 2003-05-30 |
| KR20040066840A (en) | 2004-07-27 |
| US20040255636A1 (en) | 2004-12-23 |
| CN1270843C (en) | 2006-08-23 |
| DE50210394D1 (en) | 2007-08-09 |
| US7254979B2 (en) | 2007-08-14 |
| AU2002340702A1 (en) | 2003-06-10 |
| EP1446247A1 (en) | 2004-08-18 |
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