EP2042249B1 - Method and device for manufacturing stamping parts with a largely smooth cutting plane and larger functional area - Google Patents
Method and device for manufacturing stamping parts with a largely smooth cutting plane and larger functional area Download PDFInfo
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- EP2042249B1 EP2042249B1 EP07018892A EP07018892A EP2042249B1 EP 2042249 B1 EP2042249 B1 EP 2042249B1 EP 07018892 A EP07018892 A EP 07018892A EP 07018892 A EP07018892 A EP 07018892A EP 2042249 B1 EP2042249 B1 EP 2042249B1
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- Prior art keywords
- cutting
- tool element
- guide plate
- stress
- flat strip
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- 238000005520 cutting process Methods 0.000 title claims abstract description 108
- 238000000034 method Methods 0.000 title claims abstract description 25
- 238000004519 manufacturing process Methods 0.000 title claims description 5
- 239000000463 material Substances 0.000 claims abstract description 37
- 238000003825 pressing Methods 0.000 claims abstract description 3
- 230000006835 compression Effects 0.000 claims abstract 2
- 238000007906 compression Methods 0.000 claims abstract 2
- 238000010008 shearing Methods 0.000 claims description 13
- 238000004088 simulation Methods 0.000 claims description 3
- 230000000149 penetrating effect Effects 0.000 claims description 2
- 230000001419 dependent effect Effects 0.000 description 3
- 238000004080 punching Methods 0.000 description 3
- 238000000926 separation method Methods 0.000 description 3
- 229910000831 Steel Inorganic materials 0.000 description 2
- 239000002131 composite material Substances 0.000 description 2
- 238000005336 cracking Methods 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- 238000010276 construction Methods 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 238000004049 embossing Methods 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 230000002706 hydrostatic effect Effects 0.000 description 1
- 238000007373 indentation Methods 0.000 description 1
- 238000003780 insertion Methods 0.000 description 1
- 230000037431 insertion Effects 0.000 description 1
- 238000005461 lubrication Methods 0.000 description 1
- 238000003754 machining Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000009931 pascalization Methods 0.000 description 1
- 230000035515 penetration Effects 0.000 description 1
- 238000012805 post-processing Methods 0.000 description 1
- 238000007639 printing Methods 0.000 description 1
- 238000007790 scraping Methods 0.000 description 1
- 239000011265 semifinished product Substances 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Images
Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B30—PRESSES
- B30B—PRESSES IN GENERAL
- B30B15/00—Details of, or accessories for, presses; Auxiliary measures in connection with pressing
- B30B15/02—Dies; Inserts therefor; Mounting thereof; Moulds
-
- 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
- B21D28/02—Punching blanks or articles with or without obtaining scrap; Notching
- B21D28/16—Shoulder or burr prevention, e.g. fine-blanking
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B30—PRESSES
- B30B—PRESSES IN GENERAL
- B30B15/00—Details of, or accessories for, presses; Auxiliary measures in connection with pressing
Definitions
- the invention relates to a method for producing stamped parts with largely smooth cutting and enlarged functional surface, in particular a workpiece by fine blanking and / or forming from a strip of tape, wherein the tape strip between one of a cutting punch, a guide plate for the cutting punch, one on the Guiding plate arranged ring teeth and an ejector composite upper part and a cutting insert, ejector and an inner mold existing lower part clamped when closing and forced separation in the cutting zone by shearing at high compressive stress, previously pressed the ring prongs in the tape strip and a compressive stress on the cutting tape strip is exercised.
- the invention further relates to an apparatus for producing stamped parts with a substantially smooth and enlarged functional surface, in particular a workpiece by fine blanking and / or forming a strip of tape, with a two-part tool, the at least one of a main cutting punch, a guide plate for the cutting punch, an the guide plate arranged ring spike and an ejector together upper part and a composite of a cutting plate, an ejector and an inner mold punch base comprises, wherein the tape strip is clamped in use between the guide plate and cutting plate and the ring prong is pressed into the tape strip.
- a generic method and a generic device are known from the article "fine blanking, a rational manufacturing process", special edition "sheet metal", September 1959, No. 9.
- Typical features of fine-cut parts are also the edge indent and the cutting edge.
- the feeder which increases with decreasing the corner radius and increasing sheet thickness.
- the insertion depth can be approx. 30% and the feed width is about 40% of the sheet thickness or more (see DIN 3345, fineblanking, Aug. 1980).
- the feeder is thus dependent on the material thickness and quality, so that its control is limited and often brings a limitation of the parts function, for example, by a lack of sharp edges of the corners of teeth or by the induced change in the functional length of the parts, with it.
- the punch pull therefore reduces the parting function and forces the manufacturer to use a thicker stock.
- the well-known shear press after DE 2 127 495 A1 is operated at a higher hydrostatic pressure exerted in the whole area of the workpiece subjected to plastic deformation.
- This high pressure is generated in particular in the vicinity of the tool edges by an upper jaw provided with a projection.
- This projection effectively takes on the function of the ring point, which after the DE 2 127 495 A1 not available.
- the feeder is ultimately not eliminated and material volume is displaced along the cutting line, which is accompanied by an increased risk of cracking.
- the workpiece is machined in a single-stage arrangement in at least two successive successive successive step sequences in different cutting directions, in a first cutting operation in the vertical direction cut a tailored to the workpiece geometry semi-finished product with a small indentation and cut in at least one other cutting operation in the opposite direction the part becomes.
- the collection of the first part of the step is to be replenished at least in the corner.
- predominantly the projecting punching burr is avoided.
- the feeder is ultimately not eliminated and material volume is displaced along the cutting line, which is accompanied by an increased risk of cracking.
- the present invention seeks to avoid the tendency to crack cut surfaces and the edge feed of fineblanking parts by targeted control of the stress state in the cutting zone and at the same time perform the fineblanking of thicker parts with higher process reliability economically and effectively.
- the solution according to the invention is characterized in that it is possible for the first time to economically apply the fine blanking process to parts, for example toothed parts of greater thickness without tears and sharp edges without post-processing and material displacement along the cutting line.
- the parameters for controlling the state of stress in the cutting zone for example the volume of material to be postponed depending on the type of material, shape and geometry of the workpiece can be determined by a virtual forming simulation, after which then the tool elements for the Nachschieben the material in the direction Cutting zone are designed.
- the inventive method thus covers the fine blanking of parts in a wide dimensional range, for example, parts up to large thicknesses and complicated part geometries, such as gears on gear parts, in high quality.
- even inferior steel grades can be finely cut without running the risk of tears on the cut surfaces.
- the device according to the invention has a simple and robust construction.
- Fig. 1 a schematic sectional view of the basic structure of a fine blanking tool according to the prior art
- FIG. 2 the cutting zone according to Fig. 1 in detail
- Fig. 3 a section through the device according to the invention without free cut in the tape strip in the clamped state according to the inventive method
- Fig. 4 a section through the device according to the invention without free cut in the tape strip in the half-cut state by the method according to the invention
- Fig. 5 the cutting zone according to Fig. 4 in detail
- Fig. 6 a section through the device according to the invention with free cut in the tape strip in the half-cut state.
- the Fig. 1 shows the basic structure of a fine cutting tool according to the prior art in the closed state.
- the fineblanking tool has an upper part 1 and a lower part 2.
- the upper part 1 of the fineblanking tool includes a guide plate 4 having a serrated edge 3, a cutting punch 5 guided in the guide plate 4 and an ejector 6.
- the lower part 3 is formed by an insert 7, an inner mold or punch 8 and an ejector 9.
- the cutting plate 7 and the inner mold waste have cut the fine cut part 11 at about half the workpiece thickness.
- Fig. 2 is in detail the cutting zone according to the prior art according to Fig. 1 shown.
- the tape strip 10 is located between the cutting plate 7 and guide plate 4.
- the ring spike 3 presses the tape strip 10 with the ring-tooth force FR on the cutting plate 7.
- the cutting punch 5 works with the cutting force FS against the counter-holder, here the Ejector 9, applied counterforce FG.
- the cutting force FS is dependent on the outer and inner cut line length of the part, the thickness, the tensile strength of the material to be cut and an influencing factor, the yield strength to tensile strength ratio of the workpiece material, the geometric shape of the cutting part, the tool lubrication and the Dulling of the cutting punch 5 and the cutting plate 7 taken into account.
- the inventive device of Example 1 substantially corresponds to the structure of the device, according to Fig. 1 has been described, but with the difference that a ring tooth 3 is arranged on the cutting plate 7.
- active tool element 13 is provided in the cutting line direction SL with the corresponding force FW the strip of tape 10 acts.
- the tool element 13 is supported on the one hand on the cutting punch 5 and on the other hand in a recess 4 introduced in the guide plate 4 vertically displaceable from the tape strip.
- the tape strip 10 has no cutout and the active tool element 13 is not yet engaged.
- the tape strip 10 is in the clamped state between the upper and lower part of the device according to the invention.
- the lower ring spike 3 has penetrated into the tape strip 10 and the guide plate 4 presses with the corresponding, generated by the pressure pin 15 force FF on the tape strip 10th
- Fig. 4 has the cutting punch 5, the tape strip 10 cut approximately halfway.
- the active tool element 13 has also moved into the material of the clamped tape strip 10, wherein the tool element 13, the cutting punch 5 lags slightly.
- Fig. 5 is illustrated how the active tool element 13 during its penetration into the tape strip 10 in cooperation with the lower ring point 3, the material moves almost transversely into the cutting zone.
- the state of stress in the cutting zone constantly corresponds to a compressive stress which can be adjusted accordingly by the control of the tool element 13 as a function of the material type, shape and geometry of the workpiece.
- the process parameters for the tool element 13, for example the force FW to be exerted, the hydraulic pressure for generating the force FW or the amount of the lag NE relative to the cutting punch 5, are determined as a function of
- the material type, shape and geometry of the workpiece are determined by a virtual forming simulation, in which the material flow in the forming process is shown, strains and reference stresses are analyzed to determine whether the deformation can be made and the loads can be borne by the tool elements.
- the parameters for determining the force FW of the active tool element 13 can also be determined on the real fineblank part by individual measurement. This requires a series of experiments and their evaluation in order to be able to interpret the active tool element 13 accordingly on this basis.
- a differential stamping die penetrating into the workpiece from the stamp side can be used, which is in operative connection with a controllable hydraulic system.
- the process according to the invention proceeds in such a way that first the strip of strip 10 is clamped between upper and lower part 1 or 2. From the beginning to the end of the cutting process, pressure is selectively exerted by the controlled hydraulic system in the region of the cutting zone with the pressure pin 12 and the active tool element 13. As a result, a corresponding state of stress is achieved in the cutting zone, which acts as a compressive stress during the entire cutting process. This leads to an improved surface quality, especially with poor material quality. With the targeted embossing by the active tool element 13 is a superposition of the cutting process with a transverse flow QF of part material in the cutting zone reached, whereby at the same time the punching in this area noticeably reduced. The lower serration 3 assists the transverse flow QF of the material into the cutting zone.
- the Fig. 6 shows a further variant of the device according to the invention, which in its basic structure, the structure of in Fig. 3 corresponds described device.
- a support ramp 16 is provided on the cutting plate 7, which comes to rest in the free cut 17. The support ramp 16 prevents the material from flowing in the width. All other operations are the same as in Example 1.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Punching Or Piercing (AREA)
- Perforating, Stamping-Out Or Severing By Means Other Than Cutting (AREA)
- Adornments (AREA)
- Shaping Metal By Deep-Drawing, Or The Like (AREA)
Abstract
Description
Die Erfindung betrifft ein Verfahren zum Herstellen von Stanzteilen mit weitgehend glatter Schnitt- und vergrößerter Funktionsfläche, insbesondere eines Werkstücks durch Feinschneiden und/oder Umformen aus einem Bandstreifen, bei dem der Bandstreifen zwischen einem aus einem Schneidstempel, einer Führungsplatte für den Schneidstempel, einer an der Führungsplatte angeordneten Ringzacke und einem Ausstoßer zusammengesetzten Oberteil und einem aus Schneidplatte, Auswerfer und einem Innenformstempel bestehenden Unterteil beim Schließen eingespannt und in der Schneidzone ein Trennen durch Scheren bei hoher Druckspannung erzwungen wird, wobei zuvor die Ringzacke in den Bandstreifen eingepresst und eine Druckspannung auf den zu schneidenden Bandstreifen ausgeübt wird.The invention relates to a method for producing stamped parts with largely smooth cutting and enlarged functional surface, in particular a workpiece by fine blanking and / or forming from a strip of tape, wherein the tape strip between one of a cutting punch, a guide plate for the cutting punch, one on the Guiding plate arranged ring teeth and an ejector composite upper part and a cutting insert, ejector and an inner mold existing lower part clamped when closing and forced separation in the cutting zone by shearing at high compressive stress, previously pressed the ring prongs in the tape strip and a compressive stress on the cutting tape strip is exercised.
Die Erfindung betrifft weiterhin eine Vorrichtung zum Herstellen von Stanzteilen mit weitgehend glatter und vergrößerter Funktionsfläche, insbesondere eines Werkstücks durch Feinschneiden und/oder Umformen aus einem Bandstreifen, mit einem zweiteiligen Werkzeug, das mindestens ein aus einem Hauptschneidstempel, einer Führungsplatte für den Schneidstempel, einer an der Führungsplatte angeordneten Ringzacke und einem Ausstoßer zusammen gesetztes Oberteil und ein aus einer Schneidplatte, einem Auswerfer und einem Innenformstempel zusammengesetztes Unterteil umfasst, wobei der Bandstreifen im Gebrauch zwischen Führungsplatte und Schneidplatte eingespannt ist und die Ringzacke in den Bandstreifen eingedrückt ist. Ein gattungsgemäβes Verfahren und eine gattungsgemäβe Vorrichtung sind aus dem Artikel "Feinstanzen, ein rationelles Fertigungsverfahren", Sonderdruck aus "Blech", September 1959, Nr. 9 bekannt.The invention further relates to an apparatus for producing stamped parts with a substantially smooth and enlarged functional surface, in particular a workpiece by fine blanking and / or forming a strip of tape, with a two-part tool, the at least one of a main cutting punch, a guide plate for the cutting punch, an the guide plate arranged ring spike and an ejector together upper part and a composite of a cutting plate, an ejector and an inner mold punch base comprises, wherein the tape strip is clamped in use between the guide plate and cutting plate and the ring prong is pressed into the tape strip. A generic method and a generic device are known from the article "fine blanking, a rational manufacturing process", special edition "sheet metal", September 1959, No. 9.
Es ist bekannt, dass das Feinschneiden an vorspringenden Teilekonturen, beispielsweise Verzahnungen oder Ecken oftmals zu Einrissen an den Schnittflächen führt. Dieses Phänomen ist umso stärker zu beobachten, je spitzer eine Außenkontur definiert, je dicker das zu schneidende Material und je geringer die Umformbarkeit des Materials ist. In den meisten Fallen wirkt die Schnittfläche beim Feinschneiden als Funktionsfläche, weshalb Einrisse Ausgangspunkt für Bruchversagen des Teils unter Last sein können und daher zu vermeiden sind.It is known that the fine cutting on projecting parts contours, such as teeth or corners often leads to tears on the cut surfaces. This phenomenon is all the more noticeable, the sharper an outer contour defines, the thicker the material to be cut and the lower the formability of the material. In most cases, the cut surface acts as a functional surface during fineblanking, so tears can be the starting point for breakage of the part under load and should therefore be avoided.
Glatte Schnittflächen werden beim Feinschneiden erreicht, wenn durch Überlagerung hohen hydrostatischen Druckes in der Schneidzone Trennen durch Scheren, d.h. eine plastische Formänderung, erzwungen wird. Die Schnittfläche entsteht in der Scherzone und wird deshalb in ihrer Qualität von den Werkstoffeigenschaften beeinflusst (
Beim Feinschneiden drückt die Ringzacke vor Schneidbeginn in den Werkstoff des zu schneidenden Bandstreifens ein und hindert den Werkstoff dadurch am Nachfließen während des Schneidvorganges.Smooth cutting surfaces are achieved in fine cutting, when separation by high hydrostatic pressure in the cutting zone separation by shearing, ie a plastic deformation, forced. The cut surface arises in the shear zone and is therefore in their quality influenced by the material properties (
During fineblanking, the ring point presses into the material of the strip to be cut before the start of cutting and thus prevents the material from flowing over during the cutting process.
Typische Merkmale von Feinschnittteilen sind darüber hinaus der Kanteneinzug und der Schnittgrat. Insbesondere in Eckenpartien stellt sich der Einzug ein, der mit kleiner werdendem Eckenradius und steigender Blechdicke zunimmt. Die Einzugstiefe kann rd. 30% und die Einzugsbreite etwa 40% der Blechdicke oder mehr betragen (siehe DIN 3345, Feinschneiden, Aug. 1980). Der Einzug ist damit abhängig von Materialdicke und -qualität, so dass seine Steuerung nur begrenzt möglich ist und oft eine Einschränkung der Teilefunktion, beispielsweise durch eine fehlende Scharfkantigkeit der Ecken bei Verzahnungsteilen oder durch die hervorgerufene Änderung der Funktionslänge der Teile, mit sich bringt.
Der Stanzeinzug reduziert deshalb die Teilefunktion, und zwingt den Hersteller zur Verwendung eines dickeren Ausgangsmaterials.Typical features of fine-cut parts are also the edge indent and the cutting edge. In particular, in corner parts, the feeder, which increases with decreasing the corner radius and increasing sheet thickness. The insertion depth can be approx. 30% and the feed width is about 40% of the sheet thickness or more (see DIN 3345, fineblanking, Aug. 1980). The feeder is thus dependent on the material thickness and quality, so that its control is limited and often brings a limitation of the parts function, for example, by a lack of sharp edges of the corners of teeth or by the induced change in the functional length of the parts, with it.
The punch pull therefore reduces the parting function and forces the manufacturer to use a thicker stock.
Es sind eine ganze Reihe von Lösungen bekannt, die versuchen, feine und glatte Scherflächen durch ein Schneiden unter Druck (
Die bekannten Lösungen nach
Auch bei dieser bekannten Lösung wird der Einzug letztendlich nicht beseitigt und Materialvolumen entlang der Schnittlinie verschoben, was mit einem erhöhten Risiko einer Rissbildung einhergeht.
Bei der bekannten Lösung gemäß
Auch bei dieser bekannten Lösung wird der Einzug letztendlich nicht beseitigt und Materialvolumen entlang der Schnittlinie verschoben, was mit einem erhöhten Risiko einer Rissbildung einhergeht.There are quite a number of solutions known which attempt to produce fine and smooth shear surfaces by cutting under pressure (
The known solutions
Also in this known solution, the feeder is ultimately not eliminated and material volume is displaced along the cutting line, which is accompanied by an increased risk of cracking.
In the known solution according to
Also in this known solution, the feeder is ultimately not eliminated and material volume is displaced along the cutting line, which is accompanied by an increased risk of cracking.
Bei diesem Stand der Technik liegt der Erfindung die Aufgabe zugrunde, die Rißneigung an Schnittflächen und den Kanteneinzug an Feinschneidteilen durch eine gezielte Steuerung des Spannungszustandes in der Schneidzone zu vermeiden und gleichzeitig das Feinschneiden von dickeren Teilen mit höherer Prozesssicherheit wirtschaftlich und effektiv auszuführen.In this prior art, the present invention seeks to avoid the tendency to crack cut surfaces and the edge feed of fineblanking parts by targeted control of the stress state in the cutting zone and at the same time perform the fineblanking of thicker parts with higher process reliability economically and effectively.
Diese Aufgabe wird durch ein Verfahren der eingangs genannten Gattung mit den kennzeichnenden Merkmalen des Anspruchs 1 und durch eine Vorrichtung mit den kennzeichnenden Merkmalen des Anspruchs 7 gelöst.This object is achieved by a method of the type mentioned above with the characterizing features of
Vorteilhafte Ausgestaltungen des Verfahrens und der Vorrichtung sind den Unteransprüchen entnehmbar.Advantageous embodiments of the method and the device are the dependent claims.
Die erfindungsgemäße Lösung zeichnet sich dadurch aus, dass es erstmals möglich wird, das Feinschneidverfahren auf Teile, beispielsweise Verzahnungsteile größerer Dicke ohne Einrisse und scharfen Kanten ohne Nachbearbeitung und Materialverschiebung entlang der Schnittlinie wirtschaftlich anzuwenden.The solution according to the invention is characterized in that it is possible for the first time to economically apply the fine blanking process to parts, for example toothed parts of greater thickness without tears and sharp edges without post-processing and material displacement along the cutting line.
Dies wird dadurch erreicht, dass vom Beginn bis zum Abschluss des Schneidvorgangs der Spannungszustand in der Schneidzone auf eine lageorientierte Druckspannung durch ein zusätzliches, dem Schneidstempel geringfügig nacheilendes Nachdrücken von Material in etwa zur Schneidrichtung querliegenden Richtung mittels eines parallel zur Schneidlinie zwischen Schneidstempel und Schneidplatte wirkenden Werkzeugelements mit geregelter Kraft in Abhängigkeit der Teilegeometrie und der Dicke des Werkstücks eingestellt wird.This is achieved by the fact that from the beginning to the completion of the cutting process, the state of stress in the cutting zone to a position-oriented compressive stress by an additional, the cutting punch slightly lagging after pressing material in about the cutting direction transverse direction by means of a parallel to the cutting line between cutting punch and Cutting tool member is adjusted with controlled force depending on the part geometry and the thickness of the workpiece.
Von besonderem Vorteil ist, dass die Parameter zur Steuerung des Spannungszustandes in der Schneidzone, beispielsweise das nachzudrückende Werkstoffvolumen in Abhängigkeit von Materialart, Form und Geometrie des Werkstücks durch eine virtuelle Umformsimulation bestimmt werden können, nach der dann die Werkzeugelemente für das Nachschieben des Materials in Richtung Schneidzone ausgelegt werden.It is of particular advantage that the parameters for controlling the state of stress in the cutting zone, for example the volume of material to be postponed depending on the type of material, shape and geometry of the workpiece can be determined by a virtual forming simulation, after which then the tool elements for the Nachschieben the material in the direction Cutting zone are designed.
Von wesentlicher Bedeutung ist, dass es mit dem erfindungsgemäßen Verfahren möglich wird, das Material in Querrichtung in die Schneidzone nachzuschieben, wodurch der Kanteneinzug am Teil signifikant reduziert wird. Dadurch dass der Spannungszustand in der Schneidzone im Druckbereich aufrechterhalten wird, ist gewährleistet, dass die Schnittflächen glatt und einrissfrei sind. Die Funktionsflächen sind durch den reduzierten Kanteneinzug außerdem auch weitgehend einzugsfrei.It is essential that it is possible with the method according to the invention to nachzuschieben the material in the transverse direction in the cutting zone, whereby the Kanteneinzug the part is significantly reduced. The fact that the state of stress in the cutting zone is maintained in the printing area, ensures that the cut surfaces are smooth and tear-free. The functional surfaces are also largely free of draw-in due to the reduced edge feed.
Das erfindungsgemäße Verfahren deckt somit das Feinschneiden von Teilen in einem breiten Abmessungsbereich, beispielsweise Teile bis zu großen Dicken und komplizierter Teilegeometrien, wie z.B. Verzahnungen an Getriebeteilen, in hoher Qualität ab. Darüber hinaus können mit dem erfindungsgemäßen Verfahren auch minderwertige Stahlqualitäten feingeschnitten werden, ohne Gefahr zu laufen, dass Einrisse an den Schnittflächen entstehen.The inventive method thus covers the fine blanking of parts in a wide dimensional range, for example, parts up to large thicknesses and complicated part geometries, such as gears on gear parts, in high quality. In addition, with the method according to the invention even inferior steel grades can be finely cut without running the risk of tears on the cut surfaces.
Die erfindungsgemäße Vorrichtung hat einen einfachen und robusten Aufbau.The device according to the invention has a simple and robust construction.
Weitere Vorteile und Einzelheiten ergeben sich aus der nachfolgenden Beschreibung unter Bezugnahme auf die beigefügten Zeichnungen.Further advantages and details will become apparent from the following description with reference to the accompanying drawings.
Die Erfindung soll nachstehend an zwei Ausführungsbeispielen näher erläutert werden.The invention will be explained in more detail below with reference to two embodiments.
Die
Das Feinschneidwerkzeug besitzt ein Oberteil 1 und Unterteil 2. Zum Oberteil 1 des Feinschneidwerkzeugs gehört eine Ringzacke 3 aufweisende Führungsplatte 4, ein Schneidstempel 5, der in der Führungsplatte 4 geführt ist, und ein Ausstoßer 6. Das Unterteil 3 ist gebildet aus einer Schneidplatte 7, einem Innenform- oder Lochstempel 8 und einem Auswerfer 9. Der Bandstreifen 10 aus legiertem rostfreien Stahl mit einer Dicke von 12 mm, aus dem nach dem erfindungsgemäßen Verfahren ein Feinschnittteil 11, beispielsweise ein Anschlussflansch, aus Bandstahl, gefertigt werden soll, ist nach dem gezeigten Stellungszustand des Werkzeugs zwischen Führungsplatte 4 und Schneidplatte 7 eingeklemmt und die Ringzacke 3 ist bereits in den Bandstreifen 10 eingedrungen, wodurch der Werkstoff infolge der einwirkenden Ringzackenkraft am Nachfließen während des Schneidens gehindert wird. Die Schneidplatte 7 und der Innenformabfall haben das Feinschnittteil 11 etwa mit halber Werkstückdicke geschnitten.The
The fineblanking tool has an
In der
Im eingespannten Zustand des Bandstreifens 10 zwischen Schneidplatte 7 und Führungsplatte 4 mit Ringzacke 3 entsteht bei Beginn des Schneidens ein Spannungszustand in der Schneidzone, der durch eine hohe Druckspannung gekennzeichnet ist. Je tiefer der Schneidstempel beim Schneiden in den Werkstoff eindringt, umso stärker baut sich der Druckspannungszustand in der Schneidzone ab, so dass gegen Ende des Schneidvorgangs die Druckspannung in eine Zugspannung übergeht, die Ursache für das Entstehen von Einrissen, insbesondere an Teilen komplizierter Geometrie, beispielsweise Verzahnungen oder Ecken und größerer Dicke, ist (
Die erfindungsgemäße Vorrichtung des Beispiels 1 entspricht im Wesentlichen dem Aufbau der Vorrichtung, die gemäß
Nach
In
Die Prozessparameter für das Werkzeugelement 13, beispielsweise die auszuübende Kraft FW, der Hydraulikdruck zur Erzeugung der Kraft FW oder die Größe der Nacheilung NE gegenüber dem Schneidstempel 5, werden in Abhängigkeit von Materialart, Form und Geometrie des Werkstücks durch eine virtuelle Umformsimulation bestimmt, in der der Werkstofffluss im Umformprozess dargestellt, Dehnungen und Vergleichsspannungen analysiert werden, um festzustellen, ob die Formänderung machbar und die Belastungen durch die Werkzeugelemente getragen werden können. Die Parameter für die Festlegung der Kraft FW des aktiven Werkzeugelements 13 kann aber auch am realen Feinschneidteil durch individuelle Vermessung ermittelt werden. Dazu bedarf es einer Reihe von Versuchen und deren Auswertung, um auf dieser Grundlage das aktive Werkzeugelement 13 entsprechend auslegen zu können.The process parameters for the
Als aktives Werkzeugelement 13 zum Steuern des Spannungszustandes kann ein von der Stempelseite in das Werkstück eindringender Differentialprägestempel eingesetzt werden, der mit einer steuerbaren Hydraulik in Wirkverbindung steht. Ebenso ist es aber auch möglich, den Schneidstempel 5 mit einer Schulter bzw. Stufe zu versehen, um den Querschub des Materials in die Schneidzone zu erreichen.As an
Das erfindungsgemäße Verfahren läuft so ab, dass zunächst der Bandstreifen 10 zwischen Ober- und Unterteil 1 bzw. 2 geklemmt wird. Vom Beginn bis zum Abschluss des Schneidvorgangs wird mit dem Druckbolzen 12 und dem aktiven Werkzeugelement 13 im Bereich der Schneidzone gezielt Druck durch eine gesteuerte Hydraulik ausgeübt. Dadurch wird ein entsprechender Spannungszustand in der Schneidzone erreicht, der während des gesamten Schneidvorgangs als Druckspannung wirkt.
Dies führt zu einer verbesserten Oberflächenqualität, insbesondere auch bei schlechter Materialqualität. Mit dem gezielten Prägen durch das aktive Werkzeugelement 13 wird eine Überlagerung des Schnittvorgangs mit einem Querfließen QF von Teilematerial in die Schneidezone erreicht, wodurch sich zugleich auch der Stanzeinzug in diesem Bereich merklich vermindert. Die untere Ringzacke 3 unterstützt das Querfließen QF des Materials in die Schneidzone.The process according to the invention proceeds in such a way that first the strip of
This leads to an improved surface quality, especially with poor material quality. With the targeted embossing by the
Die
- Oberteiltop
- 11
- Unterteillower part
- 22
- RingzackeV-shaped projection
- 33
- Führungsplatteguide plate
- 44
- Schneidstempelcutting punch
- 55
- Ausstoßerejector
- 66
- Schneidplattecutting board
- 77
- Lochstempelpunch
- 88th
- Auswerferejector
- 99
- Bandstreifentape strips
- 1010
- FeinschneidteilFine cutting part
- 1111
- Hydraulischer Druckbolzen für 13Hydraulic pressure pin for 13
- 1212
- Aktives WerkzeugelementActive tool element
- 1313
- Ausnehmung in 4Recess in 4
- 1414
- Druckbolzen für 4Pushpin for 4
- 1515
- Stützrampesupport ramp
- 1616
- FreischnittClear cut
- 1717
-
Kraft des Druckbolzens 15Force of the
pressure bolt 15 - FFFF
- Gegenkraftcounterforce
- FGFG
- RingzackenkraftV-shaped projection force
- FRFR
-
Kraft des Werkzeugelements 13Force of the
tool element 13 - FWFW
- Nacheilung von 13 gegenüber 5Lag of 13 versus 5
- NENE
- Querfließencross flow
- QFQF
- Schneidliniecutting line
- SLSL
- Schneidrichtungcutting direction
- SRSR
Claims (11)
- Method for the production of stampings with almost smooth and enlarged functional surface, especially fine blanking and/or forming a workpiece out of a flat strip (10), wherein the flat strip (10) at closing is clamped between an upper part (1) consisting of a shearing punch (5), a guide plate (4) for the shearing punch, a V-shaped projection (3) arranged on the guide plate and an ejector (6)and a lower part (2) consisting of cutting die (7), ejector (9) and an inner form stamp (8) and in the cutting zone is enforced a cut by shearing at high compressive stress, wherein the V-shaped projection (3) has been pressed into the flat strip (10) beforehand and a compressive stress acts on the flat strip to be cut, characterized in that the shaped projection (3) is not arranged at the guide plate (4) but at the cutting die (7), and the state of stress in the cutting zone is adjusted to a position oriented compressive stress from the beginning of the cutting process to its end by a movement slightly retarded with regard to the movement of the shearing punch (5) additionally pressing in material in a direction almost perpendicular to the cutting direction by means of a tool element (13) acting with controlled force depending on the part geometry and the thickness of the workpiece parallel to the cutting line between shearing punch (5) and cutting die (7).
- Method according to claim 1, characterized in that the parameters for controlling the state of stress in the cutting zone, for example the volume of material to be additionally pressed in depending on the type of material, shape and geometry of the workpiece, are determined by a virtual forming simulation.
- Method according to claims 1 and 2, characterized in that as tool element (13) for controlling the state of stress is used a differential coining stamp penetrating into the workpiece with the coining side or an additional shearing punch.
- Method according to claims 1 to 3, characterized in that as tool element (13) for controlling the state of stress is used a shearing punch having a shoulder.
- Method according to claims 1 to 3, characterized in that the compression stress in the flat strip (10) to be cut is created by cooperation of V-shaped projection (3) and/or a supporting platform (16) and the tool element (13).
- Method according to claims 1 to 5, characterized in that controlling of the state of stress in the cutting zone is realized at parts having teeth or corner areas of medium to great thickness.
- Device for the production of stampings with almost smooth and enlarged functional surface, especially fine blanking and/or forming a workpiece out of a flat strip, for executing the method according to claim 1, with a tool having two parts comprising an upper part (1) consisting of at least a shearing punch (5), a guide plate (4) for the shearing punch (5), a V-shaped projection (3) arranged on the guide plate (4), an ejector (6), a cutting die (7) and an ejector (9) and a lower part (2) consisting of an inner form stamping (8), wherein the flat strip is clamped between guide plate (4) and cutting die (7) and the V-shaped projection is pressed into the flat strip, characterized in that the shaped projection (3) is not arranged at the guide plate (4) but at the cutting die (7) and at least is provided one coaxial tool element (13) encompassing the shearing punch, acting in the cutting direction (SR) for shifting with retardation material in transversal direction to the cutting direction into the cutting zone, wherein the stamp side of the tool element (13) is related to the lower V-shaped projection (3), and that the tool element (13) is connected to a separate stud (12) for controlling the force to be applied on the flat strip (10).
- Device according to claim 7, characterized in that the tool element (13) is movable in vertical direction guided by the guide plate (4) in cutting direction (SR).
- Device according to claim 7, characterized in that the tool element (13) is a differential coining stamp.
- Device according to claim 7, characterized in that the tool element (13) is the shearing punch (5) having a shoulder,
- Device according to claim 7, characterized in that in the cutting die (7) is provided a supporting platform (16) for the limitation of the material flow into breadth in case of free punch.
Priority Applications (14)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
SI200730261T SI2042249T1 (en) | 2007-09-26 | 2007-09-26 | Method and device for manufacturing stamping parts with a largely smooth cutting plane and larger functional area |
AT07018892T ATE461002T1 (en) | 2007-09-26 | 2007-09-26 | METHOD AND DEVICE FOR PRODUCING STAMPED PARTS WITH A LARGELY SMOOTH CUT AND ENLARGED FUNCTIONAL AREA |
PL07018892T PL2042249T3 (en) | 2007-09-26 | 2007-09-26 | Method and device for manufacturing stamping parts with a largely smooth cutting plane and larger functional area |
EP07018892A EP2042249B1 (en) | 2007-09-26 | 2007-09-26 | Method and device for manufacturing stamping parts with a largely smooth cutting plane and larger functional area |
ES07018892T ES2341579T3 (en) | 2007-09-26 | 2007-09-26 | PROCEDURE AND DEVICE FOR MANUFACTURING PRINTED PARTS WITH VERY SMOOTH CUTTING SURFACE AND INCREASED FUNCTIONAL SURFACE. |
DK07018892.5T DK2042249T3 (en) | 2007-09-26 | 2007-09-26 | Method and device for making punching blanks with almost smooth and enlarged functional surface |
PT07018892T PT2042249E (en) | 2007-09-26 | 2007-09-26 | Method and device for manufacturing stamping parts with a largely smooth cutting plane and larger functional area |
DE502007003169T DE502007003169D1 (en) | 2007-09-26 | 2007-09-26 | Method and device for producing stamped parts with a largely smooth cut and enlarged functional surface |
MX2008011597A MX2008011597A (en) | 2007-09-26 | 2008-09-10 | Method and device for manufacturing stamping parts with a largely smooth cutting plane and larger functional area. |
CN2008101658107A CN101396707B (en) | 2007-09-26 | 2008-09-23 | Method and device for manufacturing stamping parts with a largely smooth cutting plane and larger functional area |
KR1020080093639A KR20090032000A (en) | 2007-09-26 | 2008-09-24 | Method and device for the production of a stamping with almost smooth cutting and enlarged functional surface |
JP2008245588A JP2009078300A (en) | 2007-09-26 | 2008-09-25 | Method and device for manufacturing stamping parts with largely smooth cutting plane and enlarged functional surface |
CA2639773A CA2639773C (en) | 2007-09-26 | 2008-09-25 | Method and device for the production of a stamping with almost smooth cutting and enlarged functional surface |
US12/286,008 US8939003B2 (en) | 2007-09-26 | 2008-09-26 | Method and device for the production of a stamping with almost smooth cutting and enlarged functional surface |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP07018892A EP2042249B1 (en) | 2007-09-26 | 2007-09-26 | Method and device for manufacturing stamping parts with a largely smooth cutting plane and larger functional area |
Publications (2)
Publication Number | Publication Date |
---|---|
EP2042249A1 EP2042249A1 (en) | 2009-04-01 |
EP2042249B1 true EP2042249B1 (en) | 2010-03-17 |
Family
ID=39046729
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP07018892A Active EP2042249B1 (en) | 2007-09-26 | 2007-09-26 | Method and device for manufacturing stamping parts with a largely smooth cutting plane and larger functional area |
Country Status (14)
Country | Link |
---|---|
US (1) | US8939003B2 (en) |
EP (1) | EP2042249B1 (en) |
JP (1) | JP2009078300A (en) |
KR (1) | KR20090032000A (en) |
CN (1) | CN101396707B (en) |
AT (1) | ATE461002T1 (en) |
CA (1) | CA2639773C (en) |
DE (1) | DE502007003169D1 (en) |
DK (1) | DK2042249T3 (en) |
ES (1) | ES2341579T3 (en) |
MX (1) | MX2008011597A (en) |
PL (1) | PL2042249T3 (en) |
PT (1) | PT2042249E (en) |
SI (1) | SI2042249T1 (en) |
Cited By (1)
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---|---|---|---|---|
CN103537560A (en) * | 2013-10-25 | 2014-01-29 | 无锡鹏德汽车配件有限公司 | Gear-ring pressure plate of precision stamping die for thick-plate exhaust flanges |
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JP2011045899A (en) * | 2009-08-26 | 2011-03-10 | Showa Seiko Kk | Precise plastic working method and precise plastic working device |
EP2357048B1 (en) * | 2010-02-10 | 2013-06-05 | Feintool Intellectual Property AG | Method and device for influencing the cutting and functional areas on fine-cut finished parts |
CN102120236B (en) * | 2010-12-15 | 2013-05-01 | 武汉华夏精冲技术有限公司 | Machining method for precision punching forming of fine toothed parts |
US10245864B2 (en) * | 2010-12-28 | 2019-04-02 | Kyocera Document Solutions Inc. | Method of manufacturing a sheet metal frame |
US9361917B2 (en) * | 2011-07-19 | 2016-06-07 | Intri-Plex Technologies, Inc. | Method to fabricate a base plate for piezo actuation |
JP2014018801A (en) * | 2012-07-12 | 2014-02-03 | Honda Motor Co Ltd | Hole piercing method, method for manufacturing structure with hole, and structure with hole |
JP6119999B2 (en) | 2013-11-21 | 2017-04-26 | トヨタ紡織株式会社 | Press working method and press working apparatus |
CN103691798B (en) * | 2013-12-13 | 2015-11-18 | 武汉华夏精冲技术有限公司 | A kind ofly reduce smart stamping and to collapse the fine-punching formation method at angle |
DE102014000299B3 (en) * | 2014-01-15 | 2015-07-16 | Rixen Wolfgang | Method for producing passages in a metallic body by means of high-speed shear cutting and its use |
JP6567292B2 (en) * | 2014-03-17 | 2019-08-28 | 株式会社東亜鍛工所 | Method for manufacturing metal plate having holes, method for manufacturing external gear with peripheral hole, and method for manufacturing metal plate |
CN104874633A (en) * | 2015-07-01 | 2015-09-02 | 三能器具(无锡)有限公司 | Aluminum alloy material friction deformation reduction device |
WO2017006830A1 (en) * | 2015-07-07 | 2017-01-12 | 日新製鋼株式会社 | Protrusion molding device, protrusion molding method, and molded article |
US10456821B2 (en) | 2015-10-14 | 2019-10-29 | Magna Powertrain Inc. | Fine blanking cam die |
MX2018012093A (en) * | 2016-04-05 | 2019-01-14 | Bosch Gmbh Robert | Process for blanking of metal parts. |
CN108031743B (en) * | 2017-12-26 | 2020-06-09 | 武汉协和齿环有限公司 | Toothed ring punching die and method |
CN109500234B (en) * | 2018-12-20 | 2023-12-22 | 中铝东南材料院(福建)科技有限公司 | Aluminum alloy substrate stamping production line for mechanical hard disk and working method thereof |
CN109506121B (en) * | 2018-12-27 | 2024-01-23 | 东风汽车集团股份有限公司 | Over-drawing structure, stamping product and stamping die |
CN113510180B (en) * | 2020-04-10 | 2023-02-07 | 中国兵器工业第五九研究所 | Fine blanking forming device and friction plate fine blanking forming method |
CN117772895B (en) * | 2024-02-28 | 2024-05-07 | 山西中科安瑞能源科技有限公司 | Assembling equipment for automatic production line of junction box |
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CH475805A (en) * | 1967-06-05 | 1969-07-31 | Feintool Ag | Fine cut punching tool |
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DE3324680A1 (en) * | 1983-07-08 | 1985-01-24 | DAKO-Werkzeugfabriken David Kotthaus GmbH & Co KG, 5630 Remscheid | METHOD FOR FINE CUTTING WORKPIECES AND FINE CUTTING TOOL FOR EXERCISING THE METHOD |
CH665367A5 (en) * | 1984-09-17 | 1988-05-13 | Feintool Ag | Eliminating material burr at edges of press-cut component - by at least one corrective cutting step on step-wise moving metal strip |
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US6370931B2 (en) * | 1999-06-09 | 2002-04-16 | Edward D. Bennett | Stamping die for producing smooth-edged metal parts having complex perimeter shapes |
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JP2004283875A (en) * | 2003-03-24 | 2004-10-14 | Nippon Steel Corp | Method and device for punching |
SI1815922T1 (en) * | 2006-02-03 | 2009-06-30 | Feintool Ip Ag | Method of and tool for fine-cutting pieces with small edge radius and strongly reduced depth in a single step arrangement |
-
2007
- 2007-09-26 DK DK07018892.5T patent/DK2042249T3/en active
- 2007-09-26 AT AT07018892T patent/ATE461002T1/en active
- 2007-09-26 EP EP07018892A patent/EP2042249B1/en active Active
- 2007-09-26 ES ES07018892T patent/ES2341579T3/en active Active
- 2007-09-26 SI SI200730261T patent/SI2042249T1/en unknown
- 2007-09-26 PT PT07018892T patent/PT2042249E/en unknown
- 2007-09-26 PL PL07018892T patent/PL2042249T3/en unknown
- 2007-09-26 DE DE502007003169T patent/DE502007003169D1/en active Active
-
2008
- 2008-09-10 MX MX2008011597A patent/MX2008011597A/en active IP Right Grant
- 2008-09-23 CN CN2008101658107A patent/CN101396707B/en not_active Expired - Fee Related
- 2008-09-24 KR KR1020080093639A patent/KR20090032000A/en not_active Application Discontinuation
- 2008-09-25 CA CA2639773A patent/CA2639773C/en active Active
- 2008-09-25 JP JP2008245588A patent/JP2009078300A/en not_active Withdrawn
- 2008-09-26 US US12/286,008 patent/US8939003B2/en active Active
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN103537560A (en) * | 2013-10-25 | 2014-01-29 | 无锡鹏德汽车配件有限公司 | Gear-ring pressure plate of precision stamping die for thick-plate exhaust flanges |
CN103537560B (en) * | 2013-10-25 | 2015-12-02 | 无锡鹏德汽车配件有限公司 | A kind of gear ring pressing plate of slab exhaust flange fine blanking die |
Also Published As
Publication number | Publication date |
---|---|
EP2042249A1 (en) | 2009-04-01 |
ES2341579T3 (en) | 2010-06-22 |
ATE461002T1 (en) | 2010-04-15 |
US8939003B2 (en) | 2015-01-27 |
PL2042249T3 (en) | 2010-08-31 |
CN101396707B (en) | 2013-03-20 |
CA2639773C (en) | 2016-05-10 |
JP2009078300A (en) | 2009-04-16 |
DE502007003169D1 (en) | 2010-04-29 |
MX2008011597A (en) | 2009-04-15 |
DK2042249T3 (en) | 2010-06-21 |
KR20090032000A (en) | 2009-03-31 |
CA2639773A1 (en) | 2009-03-26 |
CN101396707A (en) | 2009-04-01 |
PT2042249E (en) | 2010-06-07 |
SI2042249T1 (en) | 2010-07-30 |
US20090165525A1 (en) | 2009-07-02 |
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