EP1446247A1 - Device for ejection of moulded pieces from a moulding tool - Google Patents
Device for ejection of moulded pieces from a moulding toolInfo
- 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
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)
- Shaping Metal By Deep-Drawing, Or The Like (AREA)
- Mounting, Exchange, And Manufacturing Of Dies (AREA)
Abstract
Description
Claims
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) |
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
Non-Patent Citations (1)
Title |
---|
See references of WO03043759A1 * |
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 |
EP1446247B1 (en) | 2007-06-27 |
CN1270843C (en) | 2006-08-23 |
DE50210394D1 (en) | 2007-08-09 |
US7254979B2 (en) | 2007-08-14 |
AU2002340702A1 (en) | 2003-06-10 |
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