EP1103317B1 - Method and apparatus for punching aluminium sheet metal parts - Google Patents
Method and apparatus for punching aluminium sheet metal parts Download PDFInfo
- Publication number
- EP1103317B1 EP1103317B1 EP20000125744 EP00125744A EP1103317B1 EP 1103317 B1 EP1103317 B1 EP 1103317B1 EP 20000125744 EP20000125744 EP 20000125744 EP 00125744 A EP00125744 A EP 00125744A EP 1103317 B1 EP1103317 B1 EP 1103317B1
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- EP
- European Patent Office
- Prior art keywords
- punch
- die
- sheet metal
- hole
- cutting
- 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
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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
- B21D28/00—Shaping by press-cutting; Perforating
- B21D28/24—Perforating, i.e. punching holes
Definitions
- the invention relates to a method and a device for punching sheet metal parts from an aluminum material in which holes are produced in the flange areas, according to the preamble of claims 1 and 2.
- Such a method and apparatus are known from JP-A-53107787.
- Holes are often provided in the flange areas of shaped sheet metal parts, which are used for screwing these shaped sheet metal parts with an overall construction.
- the mechanical strength of these holes using fittings is on the one hand low because the flange areas are hardly deformed during deep drawing and calibration of the sheet metal parts and thus the aluminum material in the vicinity of the holes is relatively soft due to a lack of work hardening.
- no method or device is known with which can be produced in the immediate vicinity of the holes in the flange portions thickenings for the use of washers. Such thickening increases the mechanical strength of the screw through the higher material thickness in the field of force.
- the invention has for its object to provide a method and apparatus for punching sheet metal parts made of an aluminum material available, with which the mechanical strength of holes, especially in the flange of sheet metal parts is significantly improved ,
- the previously derived and indicated object is achieved by the subject matter of claim 1, wherein along the hole circumference a thickening is produced by a pre-deformation, the sheet metal part is held during pre-forming between a hold-down and a die and in the pre-deformation a stamp the material is displaced from the hole area in the die.
- the first teaching of the invention ensures the production of an already in itself by the greater thickness increased mechanical strength in the region of the hole. This is further increased by the fact that takes place during the displacement of the aluminum material from the hole area in the die work hardening.
- the material remaining after the pre-deformation in the hole area material is removed by shear cutting. This configuration allows the completion of the hole in one step and ensures that the hole has clean cut edges that counteract cracking.
- a further improvement in terms of production technology is experienced by the method according to the first teaching of the invention in that the pre-deformation and the shear cutting take place in one working stroke of a tool.
- the invention relates to a device for punching sheet metal parts made of aluminum materials, in particular for realizing a method according to the first teaching of the invention.
- a device for punching sheet metal parts made of aluminum materials in particular for realizing a method according to the first teaching of the invention.
- the above-derived and indicated object is achieved by the subject matter of claim 2, wherein a hold-down and a die are provided and a punch for displacing the material from the hole area is provided in the die.
- Such a device according to the second teaching of the invention makes it possible to produce a hole in the flange areas of sheet metal parts made of aluminum materials, wherein the sheet metal parts are clamped between the blank holder and the die and the punch displaces the excess material in the hole area in the form of the thickening template.
- This device thus enables the production of holes in sheet metal parts, which, as has already been carried out with regard to the first teaching of the invention, a significantly higher mechanical strength of the Verschraubungsus between the sheet metal parts with an overall construction.
- the punch is designed to displace the material as a cutting punch, so that this allows after the displacement of the material into the die together with a cutting plate, the completion of the perforation by shear cutting.
- a particularly advantageous embodiment undergoes the device according to the second teaching of the invention in that the die in the hole area connected to a retraction mechanism, displaceable Has completion stamp.
- the retraction mechanism ensures after completion of the displacement of the aluminum material in the die through the opening of the die in the hole area for the fact that the punch to displace the material with the remaining part of the die as a cutting punch and cutting plate cooperate.
- displaceable closing punch is also connected to an ejection mechanism, it is ensured that the perforated punch is ejected with the aid of the displaceable closing punch after shearing the bottom.
- the non-inventive device shown schematically in FIG. 1 has a holding-down device 1 and a die 2 for fixing a sheet-metal shaped part 3.
- the die 2 in turn has a recess 4, in which the material of the Belchformmaschines is displaced by a punch 5 from the hole portion 6 and forms the thickening 7 after this displacement.
- the aluminum material flows from the hole region 6 into the vicinity of the circumference of the hole region 6, whereby the thickening 7 forms with a relatively uniform, work-hardened material structure.
- FIG. 2 The illustrated in Fig. 2 embodiment of an apparatus according to the invention for punching sheet metal parts made of aluminum materials has a tool frame 8, on which a hold-down 9, a die 10 and a punch 11 are arranged.
- the die 10 has in the illustrated embodiment in the hole area on a not shown in detail retraction mechanism and also not shown in detail ejector mechanism, sliding end punch 13.
- the displaceable end punch 13 allows the displacement of the aluminum material from the hole area by the punch and the subsequent shear cutting of the leftover remainder of the material in the hole area
- the displaceable end punch 13 is retracted after the displacement of the material from the hole area in the thickening relative to the base body 14 of the die 10, so that the cutting edge 15 of the Base 14 of the die 10 is released.
- the ejector mechanism not shown, ensures that the displaceable end punch 13 is displaced upwardly out of the main body 14 of the die 10, so that the perforated butt is ejected.
- the section shown in FIG. 3 through a hole made in accordance with the invention in the flange region of a sheet metal part 3 shows the thickening 7 along the circumference of the hole.
- the method according to the invention and the device according to the invention ensure a thickening 7 with a homogeneous material structure and partial work hardening with simultaneously clean hole edges.
- the inventive method and device according to the invention are therefore particularly suitable both for non-hardenable Al-sheet alloys, as they are regularly deformed in the soft state and thus are often too soft in the flange for a mechanically sufficient screwing, as well as for thermosetting sheet metal materials in the T4 condition (cold cured) deformed or used.
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Shaping Metal By Deep-Drawing, Or The Like (AREA)
- Forging (AREA)
- Punching Or Piercing (AREA)
Description
Die Erfindung betrifft ein Verfahren bzw. eine Vorrichtung zum Lochen von Blechformteilen aus einem Aluminiumwerkstoff bei welchem in den Flanschbereichen Löcher hergestellt werden, gemäß Oberbegriff der Ansprüche 1 und 2. Ein solches Verfahren und eine solche Vorrichtung sind aus der JP-A-53107787 bekannt.The invention relates to a method and a device for punching sheet metal parts from an aluminum material in which holes are produced in the flange areas, according to the preamble of
In den Flanschbereichen von Blechformteilen sind häufig Löcher vorgesehen, die zur Verschraubung dieser Blechformteile mit einer Gesamtkonstruktion dienen. Die mechanische Belastbarkeit von diese Löcher nutzenden Verschraubungen ist zum einen dadurch gering, daß die Flanschbereiche beim Tiefzug und der Kalibrierung der Blechformteile kaum verformt werden und somit der Aluminiumwerkstoff in der Umgebung der Löcher aufgrund einer fehlenden Kaltverfestigung relativ weich ist. Zum anderen ist bislang kein Verfahren bzw. keine Vorrichtung bekannt, mit der in der unmittelbaren Umgebung der Löcher in den Flanschbereichen Aufdickungen für den Einsatz von Unterlegscheiben hergestellt werden können. Derartige Aufdickungen erhöhen die mechanische Belastbarkeit der Verschraubungen durch die höhere Materialstärke im Bereich der Krafteinleitung.Holes are often provided in the flange areas of shaped sheet metal parts, which are used for screwing these shaped sheet metal parts with an overall construction. The mechanical strength of these holes using fittings is on the one hand low because the flange areas are hardly deformed during deep drawing and calibration of the sheet metal parts and thus the aluminum material in the vicinity of the holes is relatively soft due to a lack of work hardening. On the other hand, no method or device is known with which can be produced in the immediate vicinity of the holes in the flange portions thickenings for the use of washers. Such thickening increases the mechanical strength of the screw through the higher material thickness in the field of force.
Es sind Versuche unternommen worden, die beschriebenen Aufdickungen durch ein Aushalsen des Aluminiumwerkstoffes im Bereich der Löcher mit anschließendem Rückdrücken der Aushalsung herzustellen. Diese Versuche haben jedoch nicht zu den gewünschten Ergebnissen geführt.Attempts have been made to produce the thickenings described by a necking of the aluminum material in the area of the holes with subsequent back pressure of the necking. However, these attempts have not led to the desired results.
Ausgehend von dem zuvor beschriebenen Stand der Technik liegt der Erfindung die Aufgabe zugrunde, ein Verfahren bzw. eine Vorrichtung zum Lochen von Blechformteilen aus einem Aluminiumwerkstoff zur Verfügung zu stellen, mit dem die mechanische Belastbarkeit von Löchern, insbesondere in den Flanschbereichen von Blechformteilen deutlich verbessert wird.Based on the above-described prior art, the invention has for its object to provide a method and apparatus for punching sheet metal parts made of an aluminum material available, with which the mechanical strength of holes, especially in the flange of sheet metal parts is significantly improved ,
Gemäß einer ersten Lehre der Erfindung ist die zuvor hergeleitete und aufgezeigte Aufgabe durch den Gegenstand des Anspruchs 1 gelöst, wobei entlang des Lochumfanges eine Aufdickung durch eine Vorverformung hergestellt wird, das Blechformteil beim Vorverformen zwischen einem Niederhalter und einer Matrize gehalten wird und bei der Vorverformung durch einen Stempel das Material aus dem Lochbereich in die Matrize verdrängt wird.According to a first teaching of the invention, the previously derived and indicated object is achieved by the subject matter of claim 1, wherein along the hole circumference a thickening is produced by a pre-deformation, the sheet metal part is held during pre-forming between a hold-down and a die and in the pre-deformation a stamp the material is displaced from the hole area in the die.
Die erste Lehre der Erfindung gewährleistet die Herstellung einer bereits an sich durch die größere Materialstärke erhöhten mechanischen Belastbarkeit im Bereich des Loches. Diese wird dadurch weiter erhöht, daß bei der Verdrängung des Aluminiumwerkstoffes aus dem Lochbereich in die Matrize eine Kaltverfestigung stattfindet.The first teaching of the invention ensures the production of an already in itself by the greater thickness increased mechanical strength in the region of the hole. This is further increased by the fact that takes place during the displacement of the aluminum material from the hole area in the die work hardening.
Mit dem Verfahren gemäß der ersten Lehre der Erfindung lassen sich Aufdickungen mit einem an den Einsatz von Unterlegscheiben angepaßten Durchmesser von etwa dem 1,8-fachen des Lochdurchmessers herstellen, die etwa 35-40 % der Materialstärke des nicht gelochten Blechformteiles bei einer erhöhten Festigkeit durch Kaltverfestigung von etwa 25-30% aufweisen.With the method according to the first teaching of the invention can be thickening with a fitted to the use of washers diameter of about 1.8 times the hole diameter produce about 35-40% of the material thickness of the non-perforated sheet metal part with an increased strength Have strain hardening of about 25-30%.
Aus fertigungstechnischen Gründen und aus Gründen der mechanischen Belastbarkeit wird gemäß der ersten Lehre der Erfindung das nach der Vorverformung im Lochbereich verbleibende Material durch Scherschneiden entfernt. Diese Ausgestaltung ermöglicht die Fertigstellung des Loches in einem Arbeitsschritt und stellt sicher, daß das Loch saubere Schnittkanten aufweist, die einer Rißbildung entgegenwirken.For manufacturing reasons and for reasons of mechanical strength according to the first teaching of the invention, the material remaining after the pre-deformation in the hole area material is removed by shear cutting. This configuration allows the completion of the hole in one step and ensures that the hole has clean cut edges that counteract cracking.
Eine in fertigungstechnischer Hinsicht weitere Verbesserung erfährt das Verfahren gemäß der ersten Lehre der Erfindung dadurch, daß die Vorverformung und das Scherschneiden in einem Arbeitshub eines Werkzeugs erfolgt.A further improvement in terms of production technology is experienced by the method according to the first teaching of the invention in that the pre-deformation and the shear cutting take place in one working stroke of a tool.
Gemäß einer zweiten Lehre betrifft die Erfindung eine Vorrichtung zum Lochen von Blechformteilen aus Aluminiumwerkstoffen, insbesondere zur Verwirklichung eines Verfahrens nach der ersten Lehre der Erfindung. Für eine derartige Vorrichtung ist die oben hergeleitete und aufgezeigte Aufgabe dadurch den gegenstand des Anspruchs 2 gelöst, wobei ein Niederhalter und eine Matrize vorgesehen sind und ein Stempel zur Verdrängung des Materials aus dem Lochbereich in die Matrize vorgesehen ist.According to a second teaching, the invention relates to a device for punching sheet metal parts made of aluminum materials, in particular for realizing a method according to the first teaching of the invention. For such a device, the above-derived and indicated object is achieved by the subject matter of
Eine derartige Vorrichtung gemäß der zweiten Lehre der Erfindung ermöglicht die Herstellung eines Loches in den Flanschbereichen von Blechformteilen aus Aluminiumwerkstoffen, wobei die Blechformteile zwischen dem Niederhalter und der Matrize eingespannt sind und der Stempel das überschüssige Material im Lochbereich in die Form der Aufdickung vorgebende Matrize verdrängt. Diese Vorrichtung ermöglicht somit die Herstellung von Löchern in Blechformteilen, die, wie bereits im Hinblick auf die erste Lehre der Erfindung ausgeführt worden ist, eine deutlich höhere mechanische Belastbarkeit der Verschraubungspunkte zwischen den Blechformteilen mit einer Gesamtkonstruktion gewährleisten.Such a device according to the second teaching of the invention makes it possible to produce a hole in the flange areas of sheet metal parts made of aluminum materials, wherein the sheet metal parts are clamped between the blank holder and the die and the punch displaces the excess material in the hole area in the form of the thickening template. This device thus enables the production of holes in sheet metal parts, which, as has already been carried out with regard to the first teaching of the invention, a significantly higher mechanical strength of the Verschraubungspunkte between the sheet metal parts with an overall construction.
Dadurch, daß in der Vorrichtung ein Schneidstempel und eine Schneidplatte vorgesehen ist, läßt sich mit einer derart ausgestalteten Vorrichtung das im Lochbereich nach der Vorverformung angrenzend zur Matrize stehengebliebene Material durch Scherschneiden entfernen, wodurch die bereits oben angesprochenen Vorteile verwirklicht sind.Characterized in that in the device a cutting punch and a cutting plate is provided, can be removed with a device designed in this way in the hole area after the pre-deformation adjacent to the die material by shear cutting, whereby the above-mentioned advantages are realized.
In der Vorrichtung gemäß der zweiten Lehre der Erfindung ist der Stempel zur Verdrängung des Materials als Schneidstempel ausgebildet, so daß dieser nach der Verdrängung des Materials in die Matrize zusammen mit einer Schneidplatte die Vollendung der Lochung durch Scherschneiden ermöglicht.In the device according to the second teaching of the invention, the punch is designed to displace the material as a cutting punch, so that this allows after the displacement of the material into the die together with a cutting plate, the completion of the perforation by shear cutting.
Eine besonders vorteilhafte Ausgestaltung erfährt die Vorrichtung gemäß der zweiten Lehre der Erfindung dadurch, daß die Matrize im Lochbereich einen mit einer Rückzugmechanik verbundenen, verschiebbaren Abschlußstempel aufweist. Die Rückzugsmechanik sorgt nach Abschluß der Verdrängung des Aluminiumwerkstoffes in die Matrize durch die Öffnung der Matrize im Lochbereich dafür, daß der Stempel zur Verdrängung des Materials mit dem verbleibenden Teil der Matrize als Schneidstempel und Schneidplatte zusammenwirken.A particularly advantageous embodiment undergoes the device according to the second teaching of the invention in that the die in the hole area connected to a retraction mechanism, displaceable Has completion stamp. The retraction mechanism ensures after completion of the displacement of the aluminum material in the die through the opening of the die in the hole area for the fact that the punch to displace the material with the remaining part of the die as a cutting punch and cutting plate cooperate.
Ist der verschiebbare Abschlußstempel darüber hinaus noch mit einer Auswurfmechanik verbunden, so ist gewährleistet, daß mit Hilfe des verschiebbaren Abschlußstempels nach dem Scherschneiden des Bodens ein Auswerfen der Lochbutze erfolgt.If the displaceable closing punch is also connected to an ejection mechanism, it is ensured that the perforated punch is ejected with the aid of the displaceable closing punch after shearing the bottom.
Es gibt nun eine Vielzahl von Möglichkeiten, das erfindungsgemäße Verfahren bzw. die erfindungsgemäße Vorrichtung zum Lochen von Blechformteilen aus Aluminiumwerkstoffen auszugestalten und weiterzubilden. Hierzu wird beispielsweise verwiesen einerseits auf die den Patentansprüchen 1 und 2 nachgeordneten Patentansprüche und andererseits auf die Beschreibung von erfindungsgemäßen Ausführungsbeispielen in Verbindung mit der Zeichnung. In der Zeichnung zeigt
- Fig. 1
- schematisch den Aufbau einer nicht-erfindungsgemäßen Vorrichtung,
- Fig. 2
- schematisch ein Ausführungsbeispiel einer erfindungsgemäßen Vorrichtung und
- Fig. 3
- im Schnitt den Flanschbereich eines nach dem erfindungsgemäßen Verfahren gelochten Blechformteils.
- Fig. 1
- schematically the structure of a non-inventive device,
- Fig. 2
- schematically an embodiment of a device according to the invention and
- Fig. 3
- in section the flange portion of a perforated by the novel process sheet metal part.
Die in Fig. 1 schematisch dargestellte nicht-erfindungsgemäße Vorrichtung weist einen Niederhalter 1 und eine Matrize 2 zur Fixierung eines Blechformteiles 3 auf. Die Matrize 2 wiederum weist eine Ausnehmung 4 auf, in die das Material des Belchformteiles von einem Stempel 5 aus dem Lochbereich 6 verdrängt wird und nach dieser Verdrängung die Aufdickung 7 bildet.The non-inventive device shown schematically in FIG. 1 has a holding-down device 1 and a
Bei der Verdrängung fließt der Aluminiumwerkstoff aus dem Lochbereich 6 in die Umgebung des Umfangs des Lochbereiches 6 wodurch sich die Aufdickung 7 mit relativ gleichmäßiger, kaltverfestigter Materialstruktur bildet.During the displacement, the aluminum material flows from the
Das in Fig. 2 dargestellte Ausführungsbeispiel einer erfindungsgemäßen Vorrichtung zum Lochen von Blechformteilen aus Aluminiumwerkstoffen weist einen Werkzeugrahmen 8 auf, an dem ein Niederhalter 9, eine Matrize 10 und ein Stempel 11 angeordnet sind.The illustrated in Fig. 2 embodiment of an apparatus according to the invention for punching sheet metal parts made of aluminum materials has a tool frame 8, on which a hold-
Fig. 2 zeigt das Ausführungsbeispiel einer erfindungsgemäßen Vorrichtung in geöffnetem Zustand mit auf die Matrize 10 aufgelegtem Blechformteil 12.Fig. 2 shows the embodiment of a device according to the invention in the open state with placed on the die 10 sheet metal part 12th
Die Matrize 10 weist bei dem dargestellten Ausführungsbeispiel im Lochbereich einen mit einer im einzelnen nicht dargestellten Rückzugsmechanik und einer ebenfalls im einzelnen nicht dargestellten Auswurfmechanik verbundenen, verschiebbaren Abschlußstempel 13 auf.The die 10 has in the illustrated embodiment in the hole area on a not shown in detail retraction mechanism and also not shown in detail ejector mechanism, sliding
Der verschiebbare Abschlußstempel 13 ermöglicht die Verdrängung des Aluminiumwerkstoffes aus dem Lochbereich durch den Stempel und das anschließende Scherschneiden des stehengebliebenen Restes des Materials im Lochbereich zwischen dem Stempel 11 und dem Grundkörper 14 der Matrize 10 in einem Arbeitszug des Stempels 11. Hierzu wird der verschiebbare Abschlußstempel 13 nach der Verdrängung des Materials aus dem Lochbereich in die Aufdickung relativ zum Grundkörper 14 der Matrize 10 zurückgezogen, so daß die Schneidkante 15 des Grundkörpers 14 der Matrize 10 freigegeben wird. Anschließend sorgt die nicht dargestellte Auswurfmechanik dafür, daß der verschiebbare Abschlußstempel 13 nach oben aus dem Grundkörper 14 der Matrize 10 verschoben wird, so daß die Lochbutze ausgeworfen wird.The
Der in Fig. 3 dargestellte Schnitt durch ein erfindungsgemäß hergestelltes Loch im Flanschbereich eines Blechformteils 3 zeigt die Aufdickung 7 entlang des Umfangs des Loches. Das erfindungsgemäße Verfahren bzw. die erfindungsgemäße Vorrichtung gewährleisten eine Aufdickung 7 mit homogener Materialstruktur und teilweiser Kaltverfestigung bei gleichzeitig sauberen Lochrändern. Das erfindungsgemäße Verfahren bzw. die erfindungsgemäße Vorrichtung eignen sich also insbesondere sowohl für nichtaushärtbare Al-Blechlegierungen, da diese regelmäßig im weichen Zustand umgeformt werden und somit im Flanschbereich oft für eine mechanisch hinreichend belastbare Verschraubung zu weich sind, als auch für aushärtbare Blechwerkstoffe, die im T4-Zustand (kaltausgehärtet) verformt oder eingesetzt werden.The section shown in FIG. 3 through a hole made in accordance with the invention in the flange region of a
Claims (4)
- A method for perforating sheet-metal shaped parts (3) of an aluminium material, wherein holes are made in the flange areas, a thickening (7) is produced along the circumference of the hole by pre-forming, the sheet-metal shaped part (3) is held between a push-down device (9) and a die (10), during the pre-forming the material is expelled from the hole region into the die (10) by a punch (11) and the material remaining in the hole region after the forming is removed by shear cutting, wherein the forming and the shear cutting take place in one working stroke, characterised in that the material is expelled into a recess of the die (10) which surrounds the punch (11) and is fixed with respect to the punch (11).
- A device for perforating sheet-metal shaped parts made of aluminium materials, especially for carrying out a method according to claim 1, comprising a push-down device (9), a die (10) and a punch (11) for expelling the material from the perforation region into the die (10), wherein a cutting punch and a cutting plate are provided and the punch (11) for expelling the material is embodied as a cutting punch,
characterised in that the die (10) has a recess which surrounds the punch (11) and is fixed with respect to the punch (11). - The device according to claim 2, characterised in that in the hole area the die (10) has a displaceable end punch (13) connected to withdrawal mechanics.
- The device according to claim 3,
characterised in that the displaceable end punch (13) is connected to ejection mechanics.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE1999157076 DE19957076B4 (en) | 1999-11-26 | 1999-11-26 | Method and device for punching sheet metal parts from an aluminum material |
| DE19957076 | 1999-11-26 |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| EP1103317A2 EP1103317A2 (en) | 2001-05-30 |
| EP1103317A3 EP1103317A3 (en) | 2002-02-06 |
| EP1103317B1 true EP1103317B1 (en) | 2006-01-18 |
Family
ID=7930507
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP20000125744 Expired - Lifetime EP1103317B1 (en) | 1999-11-26 | 2000-11-24 | Method and apparatus for punching aluminium sheet metal parts |
Country Status (4)
| Country | Link |
|---|---|
| EP (1) | EP1103317B1 (en) |
| DE (2) | DE19957076B4 (en) |
| ES (1) | ES2257256T3 (en) |
| PT (1) | PT1103317E (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7308814B2 (en) | 2005-10-13 | 2007-12-18 | Gassner Ges.M.B.H. & Co Kg | Method for perforating a sheet |
| DE102016205492A1 (en) | 2016-04-04 | 2017-10-05 | Thyssenkrupp Ag | Method and device for forming a semifinished product |
| CN109500219A (en) * | 2018-12-18 | 2019-03-22 | 常州工利精机科技有限公司 | A kind of hole class blanking die and hole class blanking method |
| CN109940086B (en) * | 2019-02-27 | 2021-02-12 | 江苏省金鑫安防设备有限公司 | Production process of fireproof door |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE841436C (en) * | 1949-09-14 | 1952-06-16 | Stihl Andreas | Process for the production of sharp-edged collars on metal sheets made of hard material |
| DE2536611A1 (en) * | 1975-08-16 | 1977-02-24 | Daimler Benz Ag | Tool with tapping shank for perforating plate - has mandrel piercing hole by heat and axial pressure |
| JPS53107787A (en) * | 1977-03-02 | 1978-09-20 | Toyota Motor Corp | Pressure working apparatus |
-
1999
- 1999-11-26 DE DE1999157076 patent/DE19957076B4/en not_active Expired - Fee Related
-
2000
- 2000-11-24 ES ES00125744T patent/ES2257256T3/en not_active Expired - Lifetime
- 2000-11-24 DE DE50012075T patent/DE50012075D1/en not_active Expired - Fee Related
- 2000-11-24 PT PT00125744T patent/PT1103317E/en unknown
- 2000-11-24 EP EP20000125744 patent/EP1103317B1/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| DE19957076B4 (en) | 2006-10-19 |
| EP1103317A2 (en) | 2001-05-30 |
| PT1103317E (en) | 2006-05-31 |
| DE19957076A1 (en) | 2001-06-07 |
| DE50012075D1 (en) | 2006-04-06 |
| EP1103317A3 (en) | 2002-02-06 |
| ES2257256T3 (en) | 2006-08-01 |
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