EP3409392B1 - Method for manufacturing stamped parts - Google Patents

Method for manufacturing stamped parts Download PDF

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Publication number
EP3409392B1
EP3409392B1 EP17000913.8A EP17000913A EP3409392B1 EP 3409392 B1 EP3409392 B1 EP 3409392B1 EP 17000913 A EP17000913 A EP 17000913A EP 3409392 B1 EP3409392 B1 EP 3409392B1
Authority
EP
European Patent Office
Prior art keywords
workpiece
burr
die
indentation
reduction
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.)
Active
Application number
EP17000913.8A
Other languages
German (de)
French (fr)
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EP3409392A1 (en
Inventor
Sven HOFSTETTER
Herbert Fuchs
Jonatan GERSBACH
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Feintool International Holding AG
Original Assignee
Feintool International Holding AG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Feintool International Holding AG filed Critical Feintool International Holding AG
Priority to ES17000913T priority Critical patent/ES2941059T3/en
Priority to EP17000913.8A priority patent/EP3409392B1/en
Priority to JP2018095358A priority patent/JP6726701B2/en
Priority to CN201810528403.1A priority patent/CN108971295B/en
Priority to KR1020180061119A priority patent/KR20180131445A/en
Priority to US15/993,049 priority patent/US11059087B2/en
Publication of EP3409392A1 publication Critical patent/EP3409392A1/en
Priority to KR1020200040547A priority patent/KR102253535B1/en
Application granted granted Critical
Publication of EP3409392B1 publication Critical patent/EP3409392B1/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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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
    • B21D35/00—Combined processes according to or processes combined with methods covered by groups B21D1/00 - B21D31/00
    • B21D35/002—Processes combined with methods covered by groups B21D1/00 - B21D31/00
    • B21D35/005—Processes combined with methods covered by groups B21D1/00 - B21D31/00 characterized by the material of the blank or the workpiece
    • 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
    • B21D28/26—Perforating, i.e. punching holes in sheets or flat parts
    • 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
    • B21D19/00—Flanging or other edge treatment, e.g. of tubes
    • B21D19/005—Edge deburring or smoothing
    • 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
    • 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
    • B21D53/00—Making other particular articles
    • B21D53/26—Making other particular articles wheels or the like
    • B21D53/28—Making other particular articles wheels or the like gear wheels

Definitions

  • the invention relates to a method for producing stamped parts according to the preamble of patent claim 1.
  • Such a method is for example in JP-A-2006142363 disclosed.
  • This method is based on the problem that in the case of a workpiece which, for example, is to be punched out or finely cut from a sheet metal strip, there is a so-called indentation along the cut contour on one surface of the workpiece produced in this way and a burr along the punching line on the opposite workpiece surface. or cutting contour exists.
  • the burr that protrudes from the workpiece surface in the stroke direction at the edge prevents a workpiece that has been punched or fine-blanked in this way from being used immediately and requires post-processing.
  • the procedure according to WO 97/32678 causes the workpiece placed in the embossing device and produced as a punched part to be freed from its burr by the process of embossing in a die.
  • the burr is essentially rounded here, in particular the rounding being predetermined by the die of the embossing device.
  • the workpiece produced in this way usually has a smaller cross-sectional area on the feed-side workpiece surface plane than on the burr-side workpiece surface plane.
  • the height of the indentation is understood to be the length of the indentation extension at the cut edge in the direction of the workpiece thickness or in the stroke direction of the stamping press or fineblanking press.
  • the invention can provide here that the die that rounds the burr has a radius provided for burr rounding that is smaller than the indentation height of the indentation created during punching, in particular during fineblanking, and that a reduced indentation is produced on the indentation side by the embossing process, in particular up to is reduced to a draw-in height at least substantially equal to this named radius of the die.
  • the reduction in indentation is essentially generated by the fact that the material of the workpiece is pressed in the direction of indentation during embossing or rounding of the burr.
  • the invention can provide, for example, that a die is designed in one piece, in two parts or in multiple parts and has, for example, an upper and a lower die part, with the burr rounding on the burr side of the workpiece being achieved by one of the two die parts and the reduction in the draw-in height on the draw-in side of the workpiece caused by the other die part, or the material flow reduced by the feed height is limited by the other die part when the embossing process of the workpiece takes place in the named multi-part die.
  • a particularly preferred embodiment is when the rounding of the burr-side cut edge of the workpiece after the embossing process has the same or at least essentially the same radius as the cut edge reduced in the infeed on the infeed side of the workpiece.
  • substantially is meant here that there is a difference between these both radii, or the embossed radius and the reduced draw-in height is ⁇ 25%, more preferably ⁇ 15% and even more preferably ⁇ 5%.
  • the invention hereby achieves rounded, burr-side and feed-side cut edges on the workpiece that are at least almost, if not completely, identical in terms of their geometric configuration, so that this is conducive to immediate suitability for use of the workpiece produced.
  • any punched or fine-blanked workpieces can be post-treated by embossing with the method according to the invention.
  • the embossing can take place after the punching, in particular the fineblanking, but preferably in the same press, so that with one and the same stroke of this press, both a punched, in particular fineblanked, workpiece and an embossed workpiece, in particular which is immediately ready for use, are produced, with between two The punched, in particular fine-blanked, workpiece is transferred from the punching area of the press to the embossing area of the same press.
  • the embossing device of such a press can therefore form a so-called follow-on tool, which is always used after the punching, in particular fine blanking, but always with the same stroke with which the punching, in particular fine blanking, is also effected.
  • the invention is not limited to this preferred embodiment, but can also provide that the embossing device is a completely separate device for the stamping press, in particular the fine blanking press.
  • the invention also provides that the angle between a tangent of the Interface that extends between the burr side and the infeed side of the workpiece and that is reduced, in particular completely eliminated, from the workpiece normal. In the case of workpieces that have a circular contour, this means that the conicity of the cut surface is reduced, preferably eliminated.
  • the aforementioned tangent is preferably understood to mean a tangent that is applied to the cut surface essentially in the thickness direction of the workpiece, i.e. the intersection points of the tangent with the workpiece surface plane on the feed and burr side are at a minimum distance.
  • Such a tangent encloses a larger angle with the workpiece normal of the workpiece before the embossing process is carried out than after the embossing process.
  • Such a tangent and the workpiece normal are preferably parallel to one another after the embossing process.
  • the invention can provide that the above-described reduction of the named angle is carried out at any point along a circumferential direction of the punched, in particular fine-blanked, workpiece. Such an angle reduction can take place both on the outer and on the inner cutting or punching contours of the workpiece.
  • the invention can also provide that the angle reduction described takes place only at selected predetermined positions along the circumferential direction of a cutting contour, in particular an outer or inner cutting contour, but in particular not at all circumferential positions.
  • Such an angle reduction can be limited, for example, to those positions of a generated cut surface of a workpiece that require particularly high precision or dimensional accuracy for the workpiece to be used later, in particular where at other positions that do not require such dimensional accuracy or precision, the angle reduction of the Cut surface to the workpiece normal is omitted, so that the embossing according to the invention in such, for example, only partially angle reduction to be carried out can also be carried out more quickly and/or with less wear of the tools used in comparison to an angle reduction along all possible circumferential positions of the cutting contour.
  • Any stamped or fine-blanked workpieces can be treated with the method according to the invention.
  • the method according to the invention is not limited to a specific contour shape of the at least one cutting contour of the punched, in particular fine-blanked, workpiece.
  • the invention provides for the embossing according to the invention to be carried out on slats that are used in automatic transmissions of, for example, motor vehicles and/or on gear wheels and in particular on chain sprockets that are used to drive link chains or on workpieces that have a toothing at least in sections, in particular on the outer contour.
  • the invention can provide that a reduction in the indentation and a reduction in the angle of the cut surface or a tangent lying thereon relative to the workpiece normal are each at different circumferential positions the cutting contour of the workpiece is carried out.
  • a reduction in the indentation can be carried out at certain first positions of a cutting contour lying in the circumferential direction and the named angle reduction can be carried out at other second positions along the circumferential direction of the cutting contour.
  • the invention can also provide for both a reduction in indentation and a reduction in the angle of the cut surface to be carried out at certain third positions given in the circumferential direction.
  • the respective first or respective second and/or respective third positions can have an equidistant angular distance from one another, especially in the peripheral region of the workpiece in which teeth are arranged are.
  • the invention is not limited to the use of transmission disks or gear wheels, but can be used with general validity for any type / shape of stamped, preferably fine-blanked workpieces, in particular for any asymmetrical workpieces and preferably for rotationally symmetrically stamped, in particular fine-blanked workpieces or in the case of n-fold rotationally symmetrically stamped and preferably fineblanked workpieces.
  • the named gear lamellae or gears represent special cases of such an n-fold rotationally symmetrical design of workpieces.
  • the invention is preferably further developed by the embodiments further described below .
  • the invention can provide that the die of the embossing device moves over the burr with an undersize relative to the workpiece, in particular to the position of the burr on the workpiece, coming from the burr side of the workpiece.
  • the named undersize means that the inner free cross-sectional area of the die or at least one part of a multi-part die has a free cross-sectional area that is smaller as the ridge-side cross-sectional area of the workpiece in the burr-side workpiece surface plane.
  • This material displacement which is limited by the geometric dimensions of the die, can be used, for example, to reduce the angle between the aforementioned tangent of the cut surface and the workpiece normal.
  • the undersize is thus considered here essentially in a direction parallel to the workpiece surfaces between radially outer workpiece cut surface and radially inner die surfaces or vice versa between radially inner workpiece cut surfaces and radially outer die surfaces.
  • the die surfaces considered here are those surfaces of the die that are parallel to the stroke direction or the normal to the workpiece.
  • the undersize is not present over the entire circumferential length of the punching or cutting contour of a workpiece between the workpiece and the die.
  • the invention can provide that the specified undersize is present only in the region of these positions. There can thus be positions on the die that are distributed in the circumferential direction and are undersized relative to the workpiece.
  • the same die can have an even dimension or an oversize relative to the workpiece, so that there is essentially no angular reduction of the cut surface at these positions or at least such a reduction is not generated by a radial material displacement of workpiece material.
  • the invention can provide that the material of the workpiece is displaced in the direction of the interior of the workpiece and/or towards the feed side with a run-up bevel on the die pointing towards the workpiece.
  • both the angle reduction of the cut surface to the workpiece normal can be generated according to the invention, as well as the reduction of the indentation, which was also described at the outset.
  • the invention provides that the absolute amount of the undersize corresponds to at least 50% of the distance that is measured in a direction parallel to the plane of the workpiece in the case of the punched workpiece, in particular in the case of a fineblanked workpiece, at the cut surface between the draw-in end and the tip of the burr.
  • the invention can also provide that the die of the embossing device is used to emboss an edge running along the punching contour, in particular a fine-cut contour, adjacent to the rounded burr, in the area of which the workpiece thickness is reduced compared to a workpiece area lying outside this edge.
  • this edge generation can also cause work hardening of the workpiece in the edge area.
  • Preference is given to such an embodiment of producing a reduced-thickness edge along the punching or fine-cut contour, carried out on sheets with a thickness of ⁇ 2 mm, preferably ⁇ 1.5 mm and even more preferably ⁇ 1 mm.
  • this embossing of a reduced-thickness edge can also cause the height of the indentation opposite the edge on the other side of the workpiece to be reduced as a result of material displacement in the axial or stroke direction.
  • This development according to the invention can also contribute to a reduction in indentation on the workpiece or even cause this alone.
  • the invention can provide, generally but particularly preferably in connection with the aforementioned embodiment of producing a reduced-thickness edge, that the die of the embossing device, coming from the burr side, driving over the burr and rounding it, is designed as a bell or sleeve.
  • bell or sleeve is not intended to imply here that the cross section of the die is rotationally symmetrical perpendicular to the direction of stroke, although this can be provided, but only that the die with lateral wall areas encloses an inner area into which the workpiece dips during stamping.
  • Such a die in particular a bell/sleeve, can surround one of two ejectors, between which the workpiece to be embossed is clamped during the rounding of the burr.
  • the clamping of the workpiece between two ejectors means that the majority of the workpiece surface remains completely unaffected by the embossing process and the embossing only affects the area of the punching or fine-blanking contour due to the bell- or sleeve-shaped design of the die.
  • the invention provides that the embossing device has an upper die part and a lower die part, the distance between which, viewed in the lifting direction, decreases in a direction perpendicular to the lifting direction, in particular from the interior of the die to the edge of the die and related to the workpiece thus decreases from the interior of the workpiece to the cut surface of the workpiece and preferably in the same stroke of the embossing device with which the burr rounding takes place, a workpiece thickness reduction increasing in the direction of the cut surface is also produced on the workpiece on the burr side and feed side.
  • This variant of the method according to the invention is particularly preferably used in the production of workpieces having teeth, preferably gear wheels, in particular sprocket wheels, in order to produce the workpiece thickness reduction in a respective tooth area, preferably over the radially outer tooth area or over the entire respective tooth area between the tooth tip and tooth base.
  • a run-in bevel of the tooth tip can be formed on a respective tooth area, which facilitates the insertion of the tooth tip into a respective chain link.
  • the invention can provide that at least in an area surrounding a respective tooth tip at least one of the die parts, but preferably both the upper die part and the lower die part, is oversized relative to the workpiece, and this forms a spacing area between the workpiece cut surface and the side face of the die part, in which workpiece material is formed during the reduction in workpiece thickness is displaced.
  • the method can provide that at least one of the die parts, preferably again the upper die part and the lower die part, is undersized relative to the workpiece below the aforementioned surrounding area of a respective tooth.
  • the inlet bevel can be created at the point of the tooth tip to facilitate the immersion of a chain tooth in a chain link, as well as a large-area contact over the entire thickness of the workpiece / sprocket wheel in the area of the tooth base to the chain link axis can be achieved.
  • the workpiece thickness reduction between the die parts causes the finally ready-to-use tooth geometry of the gear wheel and in particular of a sprocket wheel to be stamped, so that a workpiece that has teeth produced in this way, in particular a gear wheel, is preferred after the process of stamping or preferably fineblanking and the subsequent step single subsequent embossing step is directly ready for use, whereby particularly preferably in this following single embossing step both the feed-side indentation reduction together with the burr-side rounding takes place and at the same time in the tooth tip areas the creation of the radially outwardly increasing workpiece thickness reduction for the realization of a lead-in bevel as well as in the tooth base area the alignment of the cut surface or stamping surface is generated in the sense of an angle reduction between its tangent and the workpiece normal.
  • FIGS. 1A and 1B first show the prior art, essentially in accordance with FIG WO 97/32678 same applicant.
  • the workpiece W1 can be seen, which in this example was produced in the stamping stage of a fineblanking device.
  • the infeed E which is usual for fineblanking or general punching, can be seen on the underside infeed side.
  • the typical burr G stands out at a height h on the upper side of the burr of the workpiece W1.
  • the workpiece W1 is transferred to an embossing stage. with a inside Figure 1A
  • the burr G is rounded using the die (not shown), here with the radius R, and this step thus produces the workpiece W2 from the workpiece W1.
  • the indent side in particular the height of the indent E, remains unchanged.
  • the Figure 1B shows the burr rounding in connection with a GS die.
  • the workpiece W1 which is fine-blanked in this example, but possibly also only classically punched, is shown here, however, compared to the Figure 1A the non-parallel inclination of the cut surface SF is also visualized.
  • the uniformity or oversize is considered here in the upper workpiece plane on the burr side between the cut surface edge on the burr side and the inner side surface of the die. In this visualized case, they are aligned along the line L1.
  • the right side of the Figure 1B also shows that the rounding of the burr and the resulting material displacement also creates a bulge in addition to the rounded burr, which actually causes a cross-sectional enlargement of the embossed workpiece W1 just below the burr-side working surface level compared to the unembossed workpiece W1. Furthermore, it can be seen that the inclination of the cutting surface is unchanged compared to the normal of the workpiece surface.
  • the embossed workpiece W2 thus shows clear geometric differences, in particular differences in the surface sizes of the burr-side and feed-side workpiece surface, as well as a cut surface SF that is not parallel to the workpiece normal, so that such an embossed workpiece requires a final treatment, e.g. by grinding processes, in order to be ready for use.
  • the stamped or fineblanked workpiece W1 is clamped between two ejectors A1 and A2.
  • the die GS is bell-shaped here and surrounds the upper ejector A1 and can be moved in the stroke direction H relative to the two ejectors and the clamped workpiece W1 in order to carry out the embossing step.
  • the Figure 2B shows the closed embossing device after the execution of the embossing step according to the invention.
  • the bell-shaped die GS has moved over the burr G from the burr side and has rounded it according to its embossed rounding PR.
  • the die is equal or oversized to the workpiece, but here it also causes a reduction, preferably even an elimination, of the angle a that is included in this sectional view between the cut surface SF and the side face of the die and that named in the general part of the description angle between the mentioned tangent on the cutting surface and the workpiece normal WN.
  • a reduction in the draw-in E is also effected.
  • Both the indentation reduction and the angle reduction in the cut surface are due to the fact that the die GS with its die bottom surface GSB has moved in the closing stroke direction over the workpiece surface on the burr side, i.e. the workpiece has passed through the die GS in an edge area along the cutting contour the thickness is reduced.
  • This reduction in thickness causes a material displacement in the axial direction and radially outwards, as a result of which the reduction in angle and reduction in feed is produced. At the same time, this can also lead to strain hardening of the material in the zones Z near the edge radially on the inside of the cut surface SF.
  • the Figure 2C shows a detail of the embossed edge GR on the workpiece surface on the burr side.
  • the width of the edge GR can preferably be in the range from 0.1 to 1 mm, for example.
  • the reduction in thickness of the workpiece thickness in this edge area can also preferably be 0.1 to 1 mm.
  • the invention can also provide that the radius of the embossing rounding PR is at least essentially the same as the height of the reduced indentation in the embossed workpiece W2.
  • FIGS 3 show another embodiment of the method according to the invention, which also includes the step of edge embossing according to FIG figures 2 can be combined.
  • the Figure 3A visualized using the lines L1 and arrow P1 that the die GS is undersized compared to the workpiece W1.
  • the die side surface GSSF of the die is arranged radially on the inside of the burr G in the outer cutting contour shown here.
  • the die side surface would be arranged radially on the outside of the burr GS there is still the possibility to move the die over the workpiece W1 in the stamping stroke.
  • the Figure 3B shows the situation after the embossing stroke has been carried out.
  • the die has shifted material of the workpiece W1 radially inwards and axially, thereby reducing the insertion and reducing the angle of the cut face SF to the side face GSSF of the die, or eliminating it here.
  • the bottom surface of the die has only gone as far as the level of the workpiece surface on the burr side, so that no edge was stamped here, as was the case in the figures 2 describe. Nevertheless, such an edge embossing would also be possible.
  • the embossing rounding PR can be selected such that the ridge rounded thereby has a radius which at least substantially corresponds to the reduced draw-in height. Deviations between this radius and the reduced draw-in height of less than 25% are preferably achieved.
  • the figures 4 show a particularly preferred embodiment, which can be used, for example, in the case of n-fold rotationally symmetrical workpieces, such as transmission disks or gear wheels, preferably sprocket wheels. It can also be used to produce non-symmetrical workpieces or workpieces that have teeth only in sections, in particular on at least one section of the punched/fine-blanked peripheral contour.
  • the Figure 4A shows a sectional view of the embossing device parallel to the stroke direction or parallel to the workpiece normal WN.
  • the still unembossed workpiece W1 shown here again has an indentation of the height E, a burr G and a cut surface SF that is not parallel to the workpiece normal WN and is inclined.
  • the workpiece W1 is enclosed here by a die that has an upper die part GSO and a lower die part GSU.
  • the two die parts GSO and GSU each have an embossed rounding PR.
  • the embossing rounding PR of the lower part of the die GSU serves to stamp the burr with a desired radius, the embossing rounding PR of the upper part of the die GSO limiting the feed reduction to the value E1, since the flow of material pressed during stamping is restricted as a result.
  • Both figures also reveal an embodiment that is essential to the invention, according to which the distance between the two die parts in the stroke direction H decreases, viewed from the interior of the workpiece, in the direction of the cut surface.
  • This distance reduction is in the area B of both die parts, which according to Figure 4B extends over the tooth tip. If necessary, this area can also extend over the entire tooth height, but is arranged at least in the tooth tip area.
  • This design not only rounds off the burr G during stamping and reduces the indentation E to E1, but also reduces the thickness of the workpiece on the workpiece W1 with a reduction in thickness that increases from radially inwards in the direction of the radially outwards on a respective tooth of the Teeth having workpiece, in particular gear generated.
  • the material pressed from area B in the workpiece finds space in the space between the cut surface and the side surface of the die, due to the excess there.
  • Such a reduction in thickness, which is identically generated on both the burr side and the feed side, on each tooth of the toothed workpiece, in particular a gear wheel, can, for example, form a lead-in area of the workpiece tooth for easier running-in of the tooth into a respective chain link.
  • the Figure 4B also shows that the die or the two die parts GSO and GSU are undersized in the respective tooth base area or tooth root area, i.e. the die parts with their die side surfaces GSF are within the workpiece W1 viewed in the stroke direction.
  • starting bevels make it possible for the die, in particular its lower die part GSU, to move over the burr G of the embossing step
  • Workpiece can move over, this embossed and at the same time reduces the angle of the cut surface SF to the workpiece normal through material flow or preferably eliminated.
  • the cutting surface can be made parallel to the workpiece normal, in particular improving the engagement between the tooth surfaces there and a chain link axis.
  • This method variant also preferably results in a work piece that can be used immediately after the embossing step, in particular a work piece having teeth and preferably a sprocket wheel, which requires no rework or only a significantly reduced rework compared to the prior art.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Punching Or Piercing (AREA)
  • Gears, Cams (AREA)
  • Arc Welding In General (AREA)

Description

Die Erfindung betrifft ein Verfahren zur Herstellung von Stanzteilen gemäß dem Oberbegriff des Patentanspruchs 1.The invention relates to a method for producing stamped parts according to the preamble of patent claim 1.

Solch ein Verfahren ist z.B. in der JP-A-2006142363 offenbart.Such a method is for example in JP-A-2006142363 disclosed.

Ein weiteres Verfahren zur Herstellung von Stanzteilen ist beispielsweise bekannt aus der von der Anmelderin selbst stammenden Publikation WO 97/32678 .Another method for producing stamped parts is known, for example, from the publication by the applicant himself WO 97/32678 .

Diesem Verfahren liegt das Problem zugrunde, dass bei einem Werkstück, welches beispielsweise aus einem Blechstreifen auszustanzen bzw. feinzuschneiden ist, entlang der Schnittkontur an der einen Oberfläche des so hergestellten Werkstückes ein sogenannter Einzug vorhanden ist und an der gegenüberliegenden Werkstückoberfläche ein Grat entlang der Stanz- bzw. Schnittkontur besteht. Besonders der Grat, der aus der Werkstückoberfläche in Hubrichtung an der Kante vorsteht verhindert, dass ein derart gestanztes oder feingeschnittenes Werkstück unmittelbar eingesetzt werden kann, sondern einer Nachbearbeitung bedarf.This method is based on the problem that in the case of a workpiece which, for example, is to be punched out or finely cut from a sheet metal strip, there is a so-called indentation along the cut contour on one surface of the workpiece produced in this way and a burr along the punching line on the opposite workpiece surface. or cutting contour exists. In particular, the burr that protrudes from the workpiece surface in the stroke direction at the edge prevents a workpiece that has been punched or fine-blanked in this way from being used immediately and requires post-processing.

Das Verfahren gemäß WO 97/32678 bewirkt, dass das in die Prägevorrichtung eingelegte als Stanzteil hergestellte Werkstück durch den Vorgang des Prägens in einem Gesenk von seinem Grat befreit wird. Im Wesentlichen wird hier der Grat verrundet, insbesondere wobei die Verrundung durch das Gesenk der Prägevorrichtung vorbestimmt ist.The procedure according to WO 97/32678 causes the workpiece placed in the embossing device and produced as a punched part to be freed from its burr by the process of embossing in a die. The burr is essentially rounded here, in particular the rounding being predetermined by the die of the embossing device.

Trotz dieser Eliminierung des Grates an einem so hergestellten Werkstück muss dieses nach dem bisherigen Stand der Technik oftmals nachbearbeitet werden, beispielsweise durch Schleifen, da die verprägte Gratseite des Werkstückes und die Einzugseite des Werkstückes leicht unterschiedliche Formen bzw. Abmessungen haben, was zum Beispiel auch darauf zurückzuführen ist, dass der durch die Stanzparameter und den Werkstoff vorgegebene Einzug nicht identisch ist mit dem durch das Prägen verrundeten Grat und weiterhin auch die Schnittfläche des Werkstückes, die sich zwischen den beiden Werkstückoberflächen, also zwischen der Einzugseite und der Gratseite des Werkstückes erstreckt, nicht exakt parallel zur Hubrichtung der Presse orientiert ist, bzw. nicht exakt parallel zur Flächen-Normalen der beiden Werkstückoberflächen des hergestellten Werkstückes.Despite this elimination of the burr on a workpiece manufactured in this way, it often has to be reworked according to the prior art, for example by grinding, since the embossed burr side of the workpiece and the infeed side of the workpiece have slightly different shapes or dimensions, which is also reflected in this, for example This can be attributed to the fact that the indentation specified by the punching parameters and the material is not identical to the burr rounded by embossing, nor is the cut surface of the workpiece, which extends between the two workpiece surfaces, i.e. between the indentation side and the burr side of the workpiece is oriented exactly parallel to the stroke direction of the press, or not exactly parallel to the surface normal of the two workpiece surfaces of the workpiece produced.

Insbesondere weist üblicherweise das so hergestellte Werkstück in der einzugseitigen Werkstückoberflächenebene eine kleinere Querschnittsfläche auf als in der gratseitigen Werkstückoberflächenebene.In particular, the workpiece produced in this way usually has a smaller cross-sectional area on the feed-side workpiece surface plane than on the burr-side workpiece surface plane.

Es ist eine Aufgabe der vorliegenden Erfindung die geometrischen Abweichungen eines durch Stanzen oder Feinschneiden hergestellten Werkstückes zwischen der einzugseitigen Werkstückoberflächenebene und der gratseitigen Werkstückoberflächenebene zu reduzieren, hinsichtlich beider benannter Ursachen und besonders bevorzugt sogar vollständig zu eliminieren.It is an object of the present invention to reduce the geometric deviations of a workpiece produced by stamping or fine blanking between the feed-side workpiece surface plane and the burr-side workpiece surface plane, with regard to both named causes and particularly preferably to even completely eliminate them.

Es ist eine weiterhin bevorzugte Aufgabe der Erfindung mit einem Verfahren der eingangs genannten Art, welches auf einen Stanz- bzw. Feinschneidprozess folgt, ein Werkstück herzustellen, dass ohne weitere Nachbearbeitung oder allenfalls mit deutlich gegenüber dem bisherigen Stand der Technik verringerter Notwendigkeit der Nachbearbeitung einsatzbereit ist.It is a further preferred object of the invention with a method of the type mentioned, which follows a stamping or fineblanking process, to produce a workpiece that is ready for use without further post-processing or at most with a significantly reduced need for post-processing compared to the prior art .

Erfindungsgemäß wird diese Aufgabe durch ein Verfahren mit den Merkmalen des Patentanspruchs 1 gelöst.According to the invention, this object is achieved by a method having the features of claim 1.

Unter der Höhe des Einzuges wird dabei die Länge der Einzugsausdehnung an der Schnittkante in Richtung der Werkstückdicke bzw. in Hubrichtung der Stanzpresse bzw. Feinschneidpresse verstanden.The height of the indentation is understood to be the length of the indentation extension at the cut edge in the direction of the workpiece thickness or in the stroke direction of the stamping press or fineblanking press.

Die Erfindung kann hier vorsehen, dass das den Grat verrundende Gesenk einen zur Gratverrundung vorgesehenen Radius aufweist, welcher kleiner ist als die Einzughöhe des beim Stanzen insbesondere beim Feinschneiden entstandenen Einzugs, und dass durch den Prägevorgang auf der Einzugsseite ein verringerter Einzug erzeugt wird, insbesondere bis zu einer Einzugshöhe verringert wird, die zumindest im Wesentlichen gleich diesem benannten Radius des Gesenks ist. Die Einzugsverringerung wird im Wesentlichen dadurch erzeugt, dass Material des Werkstückes beim Prägen bzw. Verrunden des Grates in Richtung zum Einzug verpresst wird.The invention can provide here that the die that rounds the burr has a radius provided for burr rounding that is smaller than the indentation height of the indentation created during punching, in particular during fineblanking, and that a reduced indentation is produced on the indentation side by the embossing process, in particular up to is reduced to a draw-in height at least substantially equal to this named radius of the die. The reduction in indentation is essentially generated by the fact that the material of the workpiece is pressed in the direction of indentation during embossing or rounding of the burr.

Die Erfindung kann beispielsweise vorsehen, dass ein Gesenk einteilig, zweiteilig oder auch mehrteilig ausgebildet ist und z.B. ein oberes sowie ein unteres Gesenkteil aufweist, wobei die Gratverrundung an der Gratseite des Werkstückes durch eines der beiden Gesenkteile und die Verringerung der Einzughöhe auf der Einzugseite des Werkstückes durch das andere Gesenkteil bewirkt, bzw. der die Einzugshöhe veringerten Materialfluß durch das andere Gesenkteil begrenzt wird wird, wenn der Prägvorgang des Werkstückes in dem benannten mehrteiligen Gesenk stattfindet.The invention can provide, for example, that a die is designed in one piece, in two parts or in multiple parts and has, for example, an upper and a lower die part, with the burr rounding on the burr side of the workpiece being achieved by one of the two die parts and the reduction in the draw-in height on the draw-in side of the workpiece caused by the other die part, or the material flow reduced by the feed height is limited by the other die part when the embossing process of the workpiece takes place in the named multi-part die.

Eine besonders bevorzugte Ausführungsform liegt vor, wenn die Verrundung der gratseitigen Schnittkante des Werkstückes nach dem Prägevorgang den gleichen bzw. zumindest im Wesentlichen gleichen Radius aufweist wie die im Einzug reduzierte Schnittkante auf der Einzugseite des Werkstückes. Unter "im Wesentlichen" wird hier verstanden, dass eine Abweichung zwischen diesen beiden Radien, bzw. dem geprägten Radius und der reduzierten Einzugshöhe < 25 %, weiter bevorzugt < 15 % und noch weiter bevorzugt < 5 % ist.A particularly preferred embodiment is when the rounding of the burr-side cut edge of the workpiece after the embossing process has the same or at least essentially the same radius as the cut edge reduced in the infeed on the infeed side of the workpiece. By "substantially" is meant here that there is a difference between these both radii, or the embossed radius and the reduced draw-in height is <25%, more preferably <15% and even more preferably <5%.

Die Erfindung erzielt hierdurch, dass verrundete, gratseitige und einzugseitige Schnittkanten an dem Werkstück vorliegen, die hinsichtlich ihrer geometrischen Ausgestaltung zumindest nahezu, wenn nicht gar vollständig identisch ausgebildet sind, sodass dies einer unmittelbaren Eignung zur Benutzung des erzeugten Werkstückes zuträglich ist.The invention hereby achieves rounded, burr-side and feed-side cut edges on the workpiece that are at least almost, if not completely, identical in terms of their geometric configuration, so that this is conducive to immediate suitability for use of the workpiece produced.

Mit dem erfindungsgemäßen Verfahren können grundsätzlich jegliche gestanzte bzw. feingeschnittene Werkstücke durch das Prägen nachbehandelt werden. Das Prägen kann hierbei zeitlich nach dem Stanzen insbesondere dem Feinschneiden erfolgen, bevorzugt jedoch in derselben Presse, sodass mit ein und demselben Hub dieser Presse sowohl ein gestanztes, insbesondere feingeschnittenes Werkstück entsteht sowie auch ein geprägtes Werkstück, insbesondere welches unmittelbar einsatzbereit ist, wobei zwischen zwei Hüben das gestanzte, insbesondere feingeschnittene Werkstück von dem Stanzbereich der Presse in den Prägebereich derselben Presse transferiert wird.In principle, any punched or fine-blanked workpieces can be post-treated by embossing with the method according to the invention. The embossing can take place after the punching, in particular the fineblanking, but preferably in the same press, so that with one and the same stroke of this press, both a punched, in particular fineblanked, workpiece and an embossed workpiece, in particular which is immediately ready for use, are produced, with between two The punched, in particular fine-blanked, workpiece is transferred from the punching area of the press to the embossing area of the same press.

Die Prägevorrichtung einer solchen Presse kann demnach ein sogenanntes Folgewerkzeug bilden, welches immer zeitlich nach dem Stanzen, insbesondere Feinschneiden zum Einsatz kommt, jedoch immer mit demselben Hub, mit welchem auch das Stanzen, insbesondere Feinschneiden bewirkt wird.The embossing device of such a press can therefore form a so-called follow-on tool, which is always used after the punching, in particular fine blanking, but always with the same stroke with which the punching, in particular fine blanking, is also effected.

Die Erfindung ist jedoch nicht auf diese bevorzugte Ausführung beschränkt, sondern kann ebenso vorsehen, dass die Prägevorrichtung eine gänzlichst separate Vorrichtung zur Stanz-, insbesondere Feinschneidpresse ist.However, the invention is not limited to this preferred embodiment, but can also provide that the embossing device is a completely separate device for the stamping press, in particular the fine blanking press.

Die Erfindung sieht auch vor, dass mit demselben Hub der Prägevorrichtung mit welchem die Gratverrundung erfolgt auch der Winkel zwischen einer Tangente der Schnittfläche, die sich zwischen der Gratseite und der Einzugseite des Werkstückes erstreckt und der Werkstück-Normalen verringert, insbesondere vollständig eliminiert wird. Bei Werkstücken, die eine Kreiskontur aufweisen bedeutet dies, dass die Konizität der Schnittfläche verringert, bevorzugt eliminiert wird.The invention also provides that the angle between a tangent of the Interface that extends between the burr side and the infeed side of the workpiece and that is reduced, in particular completely eliminated, from the workpiece normal. In the case of workpieces that have a circular contour, this means that the conicity of the cut surface is reduced, preferably eliminated.

Unter der zuvor benannten Tangente wird bevorzugt eine solche Tangente verstanden, die im Wesentlichen in der Dickenrichtung des Werkstückes an die Schnittfläche angelegt ist, somit also die Schnittpunkte der Tangente mit der einzug- und gratseitigen Werkstückoberflächenebene minimalen Abstand aufweisen. Eine solche Tangente schließt mit der Werkstück-Normalen des Werkstückes vor der Durchführung des Prägevorganges einen größeren Winkel ein als nach dem Prägevorgang. Bevorzugt liegen eine solche Tangente und die Werkstück-Normale nach dem Prägevorgang parallel zueinander.The aforementioned tangent is preferably understood to mean a tangent that is applied to the cut surface essentially in the thickness direction of the workpiece, i.e. the intersection points of the tangent with the workpiece surface plane on the feed and burr side are at a minimum distance. Such a tangent encloses a larger angle with the workpiece normal of the workpiece before the embossing process is carried out than after the embossing process. Such a tangent and the workpiece normal are preferably parallel to one another after the embossing process.

Die Erfindung kann vorsehen, dass die vorbeschriebene Verringerung des benannten Winkels an jeder Stelle entlang einer Umfangsrichtung des gestanzten insbesondere feingeschnittenen Werkstückes vorgenommen wird. Dabei kann eine solche Winkelverringerung sowohl an äußeren als auch an inneren Schnitt- bzw. Stanzkonturen des Werkstückes erfolgen.The invention can provide that the above-described reduction of the named angle is carried out at any point along a circumferential direction of the punched, in particular fine-blanked, workpiece. Such an angle reduction can take place both on the outer and on the inner cutting or punching contours of the workpiece.

Die Erfindung kann jedoch auch vorsehen, dass die beschriebene Winkelverringerung nur an ausgewählten vorbestimmten Positionen entlang der Umfangsrichtung einer Schnittkontur insbesondere einer äußeren oder inneren Schnittkontur erfolgt, insbesondere somit jedoch nicht an allen Umfangspositionen. So kann eine solche Winkelverringerung beispielsweise auf solche Positionen einer erzeugten Schnittfläche eines Werkstückes beschränkt werden, die bei dem später einzusetzenden Werkstück eine besonders hohe Präzision oder Maßhaltigkeit erfordern, insbesondere wobei an anderen Positionen, die eine solche Maßhaltigkeit oder Präzision nicht benötigen, auf die Winkelverringerung der Schnittfläche zur Werkstück-Normalen verzichtet wird, so dass die erfindungsgemäße Prägung bei solcher zum Beispiel nur teilweise vorzunehmender Winkelreduktion auch schneller und/oder mit weniger Verschleiß der eingesetzten Werkzeuge erfolgen kann im Vergleich zu einer Winkelreduktion entlang aller möglichen Umfangspositionen der Schnittkontur.However, the invention can also provide that the angle reduction described takes place only at selected predetermined positions along the circumferential direction of a cutting contour, in particular an outer or inner cutting contour, but in particular not at all circumferential positions. Such an angle reduction can be limited, for example, to those positions of a generated cut surface of a workpiece that require particularly high precision or dimensional accuracy for the workpiece to be used later, in particular where at other positions that do not require such dimensional accuracy or precision, the angle reduction of the Cut surface to the workpiece normal is omitted, so that the embossing according to the invention in such, for example, only partially angle reduction to be carried out can also be carried out more quickly and/or with less wear of the tools used in comparison to an angle reduction along all possible circumferential positions of the cutting contour.

Mit dem erfindungsgemäßen Verfahren können jegliche gestanzte bzw. feingeschnittene Werkstücke behandelt werden. Das erfindungsgemäße Verfahren ist nicht auf eine bestimmte Konturform der wenigstens einer Schnittkontur aus gestanzten insbesondere feingeschnittenen Werkstück beschränkt.Any stamped or fine-blanked workpieces can be treated with the method according to the invention. The method according to the invention is not limited to a specific contour shape of the at least one cutting contour of the punched, in particular fine-blanked, workpiece.

Die Erfindung sieht es jedoch in besonders bevorzugter Anwendung vor, das erfindungsgemäße Prägen vorzunehmen bei Lamellen, die in Automatikgetrieben von zum Beispiel Kraftfahrzeugen zum Einsatz kommen und/oder bei Zahnrädern und insbesondere bei Kettenzahnrädern, die zum Antreiben von Gliederketten eingesetzt werden oder bei Werkstücken, welche zumindest abschnittsweise, insbesondere an der Außenkontur, eine Verzahnung aufweisen.However, in a particularly preferred application, the invention provides for the embossing according to the invention to be carried out on slats that are used in automatic transmissions of, for example, motor vehicles and/or on gear wheels and in particular on chain sprockets that are used to drive link chains or on workpieces that have a toothing at least in sections, in particular on the outer contour.

Besonders in der Anwendung bei gestanzten und bevorzugt feingeschnittenen Zähne aufweisenden Werkstücken, insbesondere Zahnrädern und bevorzugt Kettenzahnrädern kann die Erfindung vorsehen, dass ein Reduzieren des Einzuges sowie ein Reduzieren des Winkels der Schnittfläche bzw. einer daran anliegenden Tangente relativ zur Werkstück-Normalen jeweils an unterschiedlichen Umfangspositionen der Schnittkontur des Werkstücks vorgenommen wird.Particularly when used with workpieces that have punched and preferably fine-blanked teeth, in particular gear wheels and preferably sprocket wheels, the invention can provide that a reduction in the indentation and a reduction in the angle of the cut surface or a tangent lying thereon relative to the workpiece normal are each at different circumferential positions the cutting contour of the workpiece is carried out.

So kann also zum Beispiel an bestimmten ersten in Umfangsrichtung liegenden Positionen einer Schnittkontur eine Reduktion des Einzuges vorgenommen werden und an anderen zweiten Positionen entlang der Umfangsrichtung der Schnittkontur die benannte Winkelreduktion vorgenommen werden.Thus, for example, a reduction in the indentation can be carried out at certain first positions of a cutting contour lying in the circumferential direction and the named angle reduction can be carried out at other second positions along the circumferential direction of the cutting contour.

Die Erfindung kann auch vorsehen an bestimmten dritten in Umfangsrichtung gegebenen Positionen sowohl eine Einzugsreduktion als auch eine Winkelreduktion der Schnittfläche vorzunehmen.The invention can also provide for both a reduction in indentation and a reduction in the angle of the cut surface to be carried out at certain third positions given in the circumferential direction.

Besonders in der Anwendung bei Zähne aufweisenden Werkstücken, insbesondere Zahnrädern und bevorzugt Kettenzahnrädern sowie auch bei Getriebe-Lamellen können die jeweiligen ersten bzw. jeweiligen zweiten und/oder jeweiligen dritten Positionen einen äquidistanten Winkelabstand zueinander aufweisen, insbesondere in dem Umfangsbereich des Werkstückes in welchem Zähne angeordnet sind..Especially when used with workpieces that have teeth, in particular gear wheels and preferably sprocket wheels, as well as with gear lamellae, the respective first or respective second and/or respective third positions can have an equidistant angular distance from one another, especially in the peripheral region of the workpiece in which teeth are arranged are..

Die Erfindung ist jedoch auch hier nicht auf die Anwendung bei Getriebe-Lamellen oder Zahnrädern beschränkt, sondern kann mit allgemeiner Gültigkeit bei jeglicher Art / Form von gestanzten, bevorzugt feingeschnittenen Werkstücken eingesetzt werden, insbesondere bei jeglichen asymmetrischen Werkstücken und bevorzugt bei rotationssymmetrisch gestanzten, insbesondere feingeschnittenen Werkstücken bzw. bei n-zählig drehsymmetrisch gestanzten und bevorzugt feingeschnittenen Werkstücken eingesetzt werden. Die benannten Getriebe-Lamellen bzw. Zahnräder stellen Spezialfälle einer solchen n-zählig drehsymmetrischen Ausführung von Werkstücken dar.Here, too, the invention is not limited to the use of transmission disks or gear wheels, but can be used with general validity for any type / shape of stamped, preferably fine-blanked workpieces, in particular for any asymmetrical workpieces and preferably for rotationally symmetrically stamped, in particular fine-blanked workpieces or in the case of n-fold rotationally symmetrically stamped and preferably fineblanked workpieces. The named gear lamellae or gears represent special cases of such an n-fold rotationally symmetrical design of workpieces.

In Verbindung mit der erfindungsgemäßen Reduzierung des Einzuges sowie auch in Verbindung mit der erfindungsgemäßen Reduzierung des Winkels der Schnittfläche zur Werkstück-Normalen und besonders bevorzugt bei der kombinierten Durchführung sowohl einer Einzugs- als auch einer Winkelverringerung wird die Erfindung bevorzugt durch die nachfolgend weiterhin beschriebenen Ausführungen weitergebildet.In connection with the inventive reduction of the indentation as well as in connection with the inventive reduction of the angle of the cut surface to the workpiece normal and particularly preferably with the combined execution of both an indentation and an angle reduction, the invention is preferably further developed by the embodiments further described below .

So kann es die Erfindung vorsehen, dass das Gesenk der Prägevorrichtung mit einem Untermaß relativ zum Werkstück, insbesondere zur Position des Grates am Werkstück von der Gratseite des Werkstückes kommend über den Grat herüberfährt. Insbesondere wird unter dem benannten Untermaß verstanden, dass die innere freie Querschnittsfläche des Gesenkes oder zumindest eines Teils eines mehrteiligen Gesenkes eine freie Querschnittsfläche aufweist, die kleiner ist als die gratseitige Querschnittsfläche des Werkstückes in der gratseitigen Werkstückoberflächenebene.The invention can provide that the die of the embossing device moves over the burr with an undersize relative to the workpiece, in particular to the position of the burr on the workpiece, coming from the burr side of the workpiece. In particular, the named undersize means that the inner free cross-sectional area of the die or at least one part of a multi-part die has a free cross-sectional area that is smaller as the ridge-side cross-sectional area of the workpiece in the burr-side workpiece surface plane.

Dies bedeutet faktisch, dass das gestanzte bzw. feingeschnittene Werkstück nicht frei fallend in die Prägevorrichtung eingelegt werden kann, sondern dass an den Stellen wo ein Untermaß gegeben ist eine radiale und/oder axiale Materialverlagerung von Werkstückmaterial erfolgt.In fact, this means that the punched or fine-blanked workpiece cannot be placed in the embossing device in a freely falling manner, but that the workpiece material is radially and/or axially displaced at the points where it is undersized.

Durch diese Materialverlagerung, die durch die geometrischen Abmessungen des Gesenks beschränkt wird kann z.B. die Reduktion des Winkels zwischen der zuvor benannten Tangente der Schnittfläche und der Werkstück-Normalen vorgenommen werden.This material displacement, which is limited by the geometric dimensions of the die, can be used, for example, to reduce the angle between the aforementioned tangent of the cut surface and the workpiece normal.

Das Untermaß wird hier somit im Wesentlichen in einer Richtung parallel zu den Werkstückoberflächen zwischen radial außenliegenden Werkstück-Schnittfläche und radial innenliegenden Gesenkflächen bzw. umgekehrt zwischen radial innenliegenden Werkstück-Schnittflächen und radial außenliegenden Gesenkflächen betrachtet. Die hier betrachteten Gesenkflächen sind solche Flächen des Gesenks, die parallel zur Hubrichtung, bzw. Werkstücknormalen liegen.The undersize is thus considered here essentially in a direction parallel to the workpiece surfaces between radially outer workpiece cut surface and radially inner die surfaces or vice versa between radially inner workpiece cut surfaces and radially outer die surfaces. The die surfaces considered here are those surfaces of the die that are parallel to the stroke direction or the normal to the workpiece.

Durch das beschriebene Prägen mit dem benannten Untermaß wird im Wesentlichen die eingangs beschriebene Winkelreduktion zwischen einer Tangente der Schnittfläche und der Werkstück-Normalen bewirkt.The reduction in angle between a tangent of the cut surface and the workpiece normal, as described at the outset, is essentially brought about by the described embossing with the named undersize.

Auch bei dieser Ausführung des Prägens bei einem vorliegenden Untermaß kann es vorgesehen sein, dass das Untermaß nicht über die gesamte Umfangslänge der Stanz- bzw. Schnittkontur eines Werkstückes zwischen dem Werkstück und dem Gesenk vorliegt. Besonders in Verbindung mit den eingangs beschriebenen Ausführungen, dass nur an bestimmten Positionen eine Winkelreduktion der Schnittfläche zur Werkstück-Normalen benötigt wird, kann es die Erfindung vorsehen, dass nur im Bereich dieser Positionen das benannte Untermaß vorliegt. Es kann somit am Gesenk in Umfangsrichtung verteilt liegende Positionen geben, die ein Untermaß zum Werkstück aufweisen.In this embodiment of stamping with an existing undersize, it can also be provided that the undersize is not present over the entire circumferential length of the punching or cutting contour of a workpiece between the workpiece and the die. Especially in connection with the explanations described at the outset, that an angle reduction of the cut surface to the workpiece normal is only required at certain positions, the invention can provide that the specified undersize is present only in the region of these positions. There can thus be positions on the die that are distributed in the circumferential direction and are undersized relative to the workpiece.

An anderen Positionen kann dasselbe Gesenk zum Werkstück ein Gleichmaß oder auch ein Übermaß aufweisen, sodass an diesen Positionen im Wesentlichen keine Winkelverringerung der Schnittfläche erfolgt oder eine solche zumindest nicht durch eine radiale Materialverlagerung von Werkstückmaterial erzeugt wird.At other positions, the same die can have an even dimension or an oversize relative to the workpiece, so that there is essentially no angular reduction of the cut surface at these positions or at least such a reduction is not generated by a radial material displacement of workpiece material.

In Verbindung mit der Ausführung eines Untermaßes zwischen Gesenk der Prägevorrichtung und Werkstück kann die Erfindung vorsehen, dass mit einer zum Werkstück weisenden Anlaufschräge am Gesenk das Material des Werkstückes in Richtung zum Werkstückinneren und/oder zur Einzugseite verdrängt wird.In connection with the execution of an undersize between the die of the embossing device and the workpiece, the invention can provide that the material of the workpiece is displaced in the direction of the interior of the workpiece and/or towards the feed side with a run-up bevel on the die pointing towards the workpiece.

So kann mit dieser Ausführung sowohl die erfindungsgemäße Winkelreduktion der Schnittfläche zur Werkstück-Normalen erzeugt werden als auch die eingangs ebenso beschriebene Reduktion des Einzuges.With this embodiment, both the angle reduction of the cut surface to the workpiece normal can be generated according to the invention, as well as the reduction of the indentation, which was also described at the outset.

In bevorzugter Ausführung sieht die Erfindung hier vor, dass der Absolutbetrag des Untermaßes mindestens 50 % desjenigen Abstandes entspricht, der gemessen in einer Richtung parallel zur Werkstückebene beim gestanzten Werkstück insbesondere beim feingeschnittenen Werkstück an der Schnittfläche zwischen dem Einzugsende und der Gratspitze vorliegt.In a preferred embodiment, the invention provides that the absolute amount of the undersize corresponds to at least 50% of the distance that is measured in a direction parallel to the plane of the workpiece in the case of the punched workpiece, in particular in the case of a fineblanked workpiece, at the cut surface between the draw-in end and the tip of the burr.

In einer weiterhin bevorzugten Ausführung kann die Erfindung auch vorsehen, dass mit dem Gesenk der Prägevorrichtung angrenzend an den verrundeten Grat ein entlang der gratseitigen Stanzkontur insbesondere Feinschnittkontur verlaufender Rand geprägt wird, in dessen Bereich die Werkstückdicke gegenüber einem außerhalb dieses Randes liegenden Werkstückbereich reduziert ist.In a further preferred embodiment, the invention can also provide that the die of the embossing device is used to emboss an edge running along the punching contour, in particular a fine-cut contour, adjacent to the rounded burr, in the area of which the workpiece thickness is reduced compared to a workpiece area lying outside this edge.

Insbesondere kann hier mit dieser Randerzeugung auch eine Kaltverfestigung der Werkstückes im Randbereich bewirkt werden. Bevorzugt wird eine solche Ausführung der Erzeugung eines dickenreduzierten Randes entlang der Stanz- bzw. Feinschnittkontur, vorgenommen bei Blechen mit einer Dicke < 2 mm, bevorzugt < 1,5 mm und noch weiter bevorzugt < 1 mm.In particular, this edge generation can also cause work hardening of the workpiece in the edge area. Preference is given to such an embodiment of producing a reduced-thickness edge along the punching or fine-cut contour, carried out on sheets with a thickness of <2 mm, preferably <1.5 mm and even more preferably <1 mm.

Insbesondere kann auch dieses Prägen eines dickenreduzierten Randes bewirken, dass durch eine Materialverschiebung in axialer bzw. Hubrichtung, der dem Rand auf der anderen Seite des Werkstückes gegenüberliegende Einzug in seiner Höhe reduziert wird. So kann auch diese erfindungsgemäße Weiterbildung zu einer Einzugsreduzierung am Werkstück beitragen oder diese sogar alleinig bewirken.In particular, this embossing of a reduced-thickness edge can also cause the height of the indentation opposite the edge on the other side of the workpiece to be reduced as a result of material displacement in the axial or stroke direction. This development according to the invention can also contribute to a reduction in indentation on the workpiece or even cause this alone.

Die Erfindung kann allgemein aber besonders bevorzugt in Verbindung mit der zuvor benannten Ausführung der Erzeugung eines dickenreduzierten Randes vorsehen, dass das von der Gratseite kommend über den Grat herüberfahrende und dieses verrundende Gesenk der Prägevorrichtung als eine Glocke oder Hülse ausgebildet ist.The invention can provide, generally but particularly preferably in connection with the aforementioned embodiment of producing a reduced-thickness edge, that the die of the embossing device, coming from the burr side, driving over the burr and rounding it, is designed as a bell or sleeve.

Der Begriff der Glocke oder Hülse soll hier nicht implizieren, dass der Querschnitt des Gesenks senkrecht zur Hubrichtung rotationssymmetrisch ist, wenngleich dies vorgesehen sein kann, sondern nur, dass das Gesenk mit seitlichen Wandungsbereichen einen Innenbereich umschließt, in den beim Prägen das Werkstück eintaucht.The term bell or sleeve is not intended to imply here that the cross section of the die is rotationally symmetrical perpendicular to the direction of stroke, although this can be provided, but only that the die with lateral wall areas encloses an inner area into which the workpiece dips during stamping.

Ein solches Gesenk, insbesondere Glocke / Hülse kann einen von zwei Auswerfern umgeben, zwischen denen das zu prägende Werkstück während des Gratverrundens eingespannt wird. So wird durch die Einspannung des Werkstückes zwischen zwei Auswerfern bewirkt, dass der Majoritätsanteil der Werkstückoberfläche durch den Prägevorgang völlig unbeeinflusst bleibt und sich das Prägen aufgrund der glocken- bzw. hülsenförmigen Ausführung des Gesenkes nur auf den Bereich der Stanz- bzw. Feinschnittkontur auswirkt.Such a die, in particular a bell/sleeve, can surround one of two ejectors, between which the workpiece to be embossed is clamped during the rounding of the burr. The clamping of the workpiece between two ejectors means that the majority of the workpiece surface remains completely unaffected by the embossing process and the embossing only affects the area of the punching or fine-blanking contour due to the bell- or sleeve-shaped design of the die.

In einer besonders bevorzugten Weiterbildung sieht es die Erfindung vor, dass die Prägevorrichtung ein Gesenkoberteil und ein Gesenkunterteil aufweist, deren in Hubrichtung betrachteter Abstand zueinander in einer Richtung senkrecht zur Hubrichtung abnimmt, insbesondere vom Gesenkinneren zum Gesenkrand und bezogen auf das Werkstück somit vom Werkstückinneren zur Schnittfläche des Werkstückes abnimmt und bevorzugt in demselben Hub der Prägevorrichtung, mit welchem das Gratverrunden erfolgt, auch gratseitig und einzugseitig an dem Werkstück eine in Richtung zur Schnittfläche zunehmende Werkstückdickenreduzierung erzeugt wird.In a particularly preferred development, the invention provides that the embossing device has an upper die part and a lower die part, the distance between which, viewed in the lifting direction, decreases in a direction perpendicular to the lifting direction, in particular from the interior of the die to the edge of the die and related to the workpiece thus decreases from the interior of the workpiece to the cut surface of the workpiece and preferably in the same stroke of the embossing device with which the burr rounding takes place, a workpiece thickness reduction increasing in the direction of the cut surface is also produced on the workpiece on the burr side and feed side.

Diese erfindungsgemäße Verfahrensvariante wird besonders bevorzugt eingesetzt bei der Herstellung von Zähne aufweisenden Werkstücken, bevorzugt von Zahnrädern, insbesondere Kettenzahnrädern, um so die Werkstückdickenreduzierung in einem jeweiligen Zahnbereich, bevorzugt über den radial außenliegenden Zahnbereich oder über den gesamten jeweiligen Zahnbereich zwischen Zahnspitze und Zahnbasis zu erzeugen. Besonders bei der Anwendung eines solchen Prägeschrittes bei gezahnten Werkstücken, bevorzugt Kettenzahnrädern kann hierdurch an einem jeweiligen Zahnbereich eine Einlaufschräge der Zahnspitze gebildet werden, die das Eintauchen der Zahnspitze in ein jeweiliges Kettenglied erleichtert.This variant of the method according to the invention is particularly preferably used in the production of workpieces having teeth, preferably gear wheels, in particular sprocket wheels, in order to produce the workpiece thickness reduction in a respective tooth area, preferably over the radially outer tooth area or over the entire respective tooth area between the tooth tip and tooth base. Especially when using such an embossing step for toothed workpieces, preferably sprocket wheels, a run-in bevel of the tooth tip can be formed on a respective tooth area, which facilitates the insertion of the tooth tip into a respective chain link.

In bevorzugter Ausführung kann die Erfindung vorsehen, dass zumindest in einem Umgebungsbereich um eine jeweilige Zahnspitze herum wenigstens eines der Gesenkteile bevorzugt jedoch sowohl Gesenkoberteil als auch Gesenkunterteil zum Werkstück ein Übermaß aufweist und hierdurch ein Abstandsbereich zwischen Werkstückschnittfläche und Gesenkteilseitenfläche gebildet wird in welchen während der Werkstückdickenreduzierung Werkstückmaterial verdrängt wird.In a preferred embodiment, the invention can provide that at least in an area surrounding a respective tooth tip at least one of the die parts, but preferably both the upper die part and the lower die part, is oversized relative to the workpiece, and this forms a spacing area between the workpiece cut surface and the side face of the die part, in which workpiece material is formed during the reduction in workpiece thickness is displaced.

In wiederum ergänzender Weiterbildung kann das Verfahren vorsehen, dass unterhalb des vorgenannten Umgebungsbereiches eines jeweiligen Zahnes wenigstens eines der Gesenkteile, bevorzugt wiederum Gesenkoberteil und Gesenkunterteil zum Werkstück ein Untermaß aufweist.In an additional development, the method can provide that at least one of the die parts, preferably again the upper die part and the lower die part, is undersized relative to the workpiece below the aforementioned surrounding area of a respective tooth.

Mit dieser Weiterbildung kann bewirkt werden, dass zum Einen in denjenigen Bereichen in denen das zuvor beschriebene Übermaß gegeben ist das Material des Werkstückes fließen kann, dass zur Bildung der Werkstückdickenreduzierung im Zahnspitzenbereich verdrängt wird, wohingegen zum Andere in denjenigen Bereichen in denen das Untermaß gegeben ist der Winkel der Tangente der Schnittfläche zur Werkstück-Normalen reduziert wird.With this further development it can be brought about that, on the one hand, in those areas in which the above-described excess is present, the material of the workpiece can flow, that is displaced to form the workpiece thickness reduction in the tooth tip area, whereas on the other hand, in those areas where the undersize is given, the angle of the tangent of the cut surface to the workpiece normal is reduced.

So kann in einem jeweiligen Zahnbereich eines Zähne aufweisenden Werkstückes, insbesondere eines Kettenzahnrades sowohl am Ort der Zahnspitze die Einlaufschräge zur Erleichterung des Eintauchens eines Kettenzahnes in ein Kettenglied erstellt werden, als auch im Bereich der Zahnbasis eine großflächige Anlage über die gesamte Werkstückdicke des Werkstückes / Kettenzahnrades zur Kettengliedachse erzielt werden.In a respective tooth area of a workpiece with teeth, in particular a sprocket wheel, the inlet bevel can be created at the point of the tooth tip to facilitate the immersion of a chain tooth in a chain link, as well as a large-area contact over the entire thickness of the workpiece / sprocket wheel in the area of the tooth base to the chain link axis can be achieved.

Es wird somit eine optimierte Kraftübertragung zwischen einem jeweiligen Zahnbasisbereich des Werkstückes, insbesondere Kettenzahnrades und dem in Eingriff genommenen Kettenglied realisiert.An optimized power transmission is thus realized between a respective tooth base region of the workpiece, in particular a sprocket wheel, and the engaged chain link.

In besonders bevorzugter Ausführungsform wird bewirkt, dass durch die Werkstückdickenreduzierung zwischen den Gesenkteilen die endgültig benutzungsfertige Zahngeometrie des Zahnrades und insbesondere eines Kettenzahnrades geprägt wird, sodass ein derart hergestelltes Zähne aufweisendes Werkstück, insbesondere Zahnrad nach dem Prozessschnitt des Stanzens bzw. bevorzugt Feinschneidens und dem nachfolgenden bevorzugt einzigen nachfolgenden Prägeschritt direkt benutzungsfertig ist, wobei besonders bevorzugt in diesem folgenden einzigen Prägeschritt sowohl die einzugseitige Einzugsreduzierung zusammen mit der gratseitigen Gratverrundung erfolgt als auch gleichzeitig in den Zahnspitzenbereichen das Erstellen der nach radial außen zunehmenden Werkstückdickenreduzierung zur Realisierung einer Einlaufschräge sowie im Zahnbasisbereich das Ausrichten der Schnittfläche bzw. Stanzfläche im Sinne einer Winkelreduzierung zwischen deren Tangente und der Werkstück-Normalen erzeugt wird.In a particularly preferred embodiment, the workpiece thickness reduction between the die parts causes the finally ready-to-use tooth geometry of the gear wheel and in particular of a sprocket wheel to be stamped, so that a workpiece that has teeth produced in this way, in particular a gear wheel, is preferred after the process of stamping or preferably fineblanking and the subsequent step single subsequent embossing step is directly ready for use, whereby particularly preferably in this following single embossing step both the feed-side indentation reduction together with the burr-side rounding takes place and at the same time in the tooth tip areas the creation of the radially outwardly increasing workpiece thickness reduction for the realization of a lead-in bevel as well as in the tooth base area the alignment of the cut surface or stamping surface is generated in the sense of an angle reduction between its tangent and the workpiece normal.

Die bevorzugten Ausführungsformen der Erfindung werden in den nachfolgenden Figuren näher beschrieben.The preferred embodiments of the invention are described in more detail in the following figures.

Die Figuren 1A und 1B zeigen zunächst für einen Vergleich mit den später ersichtlichen Vorteilen der Erfindung den bisherigen Stand der Technik, im Wesentlichen gemäß der WO 97/32678 derselben Anmelderin.the Figures 1A and 1B first show the prior art, essentially in accordance with FIG WO 97/32678 same applicant.

Linksseitig in der Figur 1A ist das Werkstück W1 erkennbar, welches in diesem Beispiel in der Stanzstufe einer Feinschneid-Vorrichtung hergestellt wurde. An der hier unterseitigen Einzugsseite ist der für das Feinschneiden oder auch allgemeines Stanzen übliche Einzug E erkennbar. An der hier oberseitigen Gratseite des Werkstückes W1 steht der typische Grat G in der Höhe h auf.Left side in the Figure 1A the workpiece W1 can be seen, which in this example was produced in the stamping stage of a fineblanking device. The infeed E, which is usual for fineblanking or general punching, can be seen on the underside infeed side. The typical burr G stands out at a height h on the upper side of the burr of the workpiece W1.

Das Werkstück W1 wird nach dem Stanzen / Feinschneiden in eine Prägestufe transferiert. Mit einem in Figur 1A nicht gezeigten Gesenk wird der Grat G verrundet, hier mit dem Radius R und durch diesen Schritt somit aus dem Werkstück W1 das Werkstück W2 hergestellt. Die Einzugsseite, insbesondere also die Höhe des Einzuges E bleibt hierbei ungeändert.After punching/fineblanking, the workpiece W1 is transferred to an embossing stage. with a inside Figure 1A The burr G is rounded using the die (not shown), here with the radius R, and this step thus produces the workpiece W2 from the workpiece W1. The indent side, in particular the height of the indent E, remains unchanged.

In Figur 1A nicht visualisiert, aber prinzipbedingt immer vorhanden ist eine zur Hubrichtung bzw. Werkstücknormalen WN nicht parallele Ausrichtung der Schnittfläche SF. Diese bleibt im Stand der Technik durch das Gratverrunden, welche nur eine geringfügige Umformung darstellt, ungeändert.In Figure 1A not visualized, but due to the principle always present is an alignment of the cut surface SF that is not parallel to the stroke direction or workpiece normal WN. This remains unchanged in the prior art due to the rounding of the burr, which represents only a minor deformation.

Die Figur 1B zeigt die Gratverrundung in Verbindung mit einem Gesenk GS. Linksseitig in der Figur 1B ist das in diesem Beispiel feingeschnittene, ggfs. aber auch nur klassisch gestanzte Werkstück W1 abgebildet, hier ist jedoch nun gegenüber der Figur 1A auch die nichtparallele Schrägstellung der Schnittfläche SF visualisiert.the Figure 1B shows the burr rounding in connection with a GS die. Left side in the Figure 1B the workpiece W1, which is fine-blanked in this example, but possibly also only classically punched, is shown here, however, compared to the Figure 1A the non-parallel inclination of the cut surface SF is also visualized.

Mit einem durch den Pfeil P1 und die Linie L1 symbolisierten Gleichmaß oder Übermaß zwischen dem Werkstück W1 und dem Gesenk GS fährt dieses im Hub von der Gratseite über das Werkstück und verrundet den Grat G mittels der Prägerundung PR, mit welcher die Seitenfläche des Gesenks in die Bodenfläche des Gesenks übergeht.With an evenness or excess between the workpiece W1 and the die GS, symbolized by the arrow P1 and the line L1, this moves in the stroke from the burr side over the workpiece and rounds the burr G by means of the Embossing rounding PR, with which the side surface of the die merges into the bottom surface of the die.

Das Gleichmaß bzw. Übermaß ist hier betrachtet in der oberen gratseitigen Werkstückebene zwischen der gratseitigen Schnittflächenkante und der inneren Gesenkseitenfläche. In diesem visualisierten Fall fluchten diese entlang der Linie L1.The uniformity or oversize is considered here in the upper workpiece plane on the burr side between the cut surface edge on the burr side and the inner side surface of the die. In this visualized case, they are aligned along the line L1.

Die rechte Seite der Figur 1B zeigt weiterhin, dass durch die Verrundung des Grates und die damit bewirkte Materialverschiebung zusätzlich zum verrundeten Grat auch eine Wulst entsteht, die faktisch eine Querschnittsvergrößerung des geprägten Werkstückes W1 knapp unterhalb der gratseitigen Werkzeitoberflächenebene im Vergleich zum ungeprägten Werkstück W1 bewirkt. Weiterhin ist heir erkennbar, dass die Schnittflächen-Schrägstellung gegenüber den Normalen der Werkstückoberfläche ungeändert ist.The right side of the Figure 1B also shows that the rounding of the burr and the resulting material displacement also creates a bulge in addition to the rounded burr, which actually causes a cross-sectional enlargement of the embossed workpiece W1 just below the burr-side working surface level compared to the unembossed workpiece W1. Furthermore, it can be seen that the inclination of the cutting surface is unchanged compared to the normal of the workpiece surface.

Insgesamt zeigt somit das geprägte Werkstück W2 deutliche Geometrieunterschiede, insbesondere Unterschiede in den Flächengrößen von gratseitiger und einzugseitiger Werkstückoberfläche, sowie eine zur Werkstücknormalen nicht-parallele Schnittfläche SF, so dass ein solches geprägtes Werkstück einer Endbehandlung, z.B. durch Schleifprozesse bedarf, um einsatzfertig zu sein.Overall, the embossed workpiece W2 thus shows clear geometric differences, in particular differences in the surface sizes of the burr-side and feed-side workpiece surface, as well as a cut surface SF that is not parallel to the workpiece normal, so that such an embossed workpiece requires a final treatment, e.g. by grinding processes, in order to be ready for use.

Die Figuren 2 zeigen eine mögliche Ausführung der Erfindung.the figures 2 show a possible embodiment of the invention.

Gemäß Figur 2A wird das gestanzte oder feingeschnittene Werkstück W1 zwischen zwei Auswerfern A1 und A2 eingespannt. Das Gesenk GS ist hier glockenförmig ausgebildet und umgibt dabei den oberen Auswerfer A1 und ist in Hubrichtung H relativ zu beiden Auswerfern und dem eingespannten Werkstück W1 beweglich um den Prägeschritt vorzunehmen.According to Figure 2A the stamped or fineblanked workpiece W1 is clamped between two ejectors A1 and A2. The die GS is bell-shaped here and surrounds the upper ejector A1 and can be moved in the stroke direction H relative to the two ejectors and the clamped workpiece W1 in order to carry out the embossing step.

Erkennbar ist hier wiederum der Einzug E, der Grat G und die zur Normalen nicht - parallel, schräggestellte Schnittfläche SF. In der Figur 2A ist die Prägevorrichtung geöffnet, d.h. der Prägeschnitt noch nicht ausgeführt.Here again the indentation E, the ridge G and the cut surface SF, which is not parallel to the normal and inclined, are recognizable. In the Figure 2A the embossing device is open, ie the embossing cut has not yet been carried out.

Die Figur 2B zeigt die geschlossene Prägevorrichtung nach der Ausführung des erfindungsgemäßen Prägeschrittes. Das glockenförmige Gesenk GS ist von der Gratseite über den Grat G gefahren und hat diesen gemäß seiner Prägerundung PR verrundet.the Figure 2B shows the closed embossing device after the execution of the embossing step according to the invention. The bell-shaped die GS has moved over the burr G from the burr side and has rounded it according to its embossed rounding PR.

Das Gesenk weist zum Werkstück gemäß den vorherigen Definitionen ein Gleichmaß oder Übermaß auf, bewirkt jedoch hier auch eine Verringerung, bevorzugt sogar eine Eliminierung des Winkels a, der in dieser Schnittdarstellung zwischen der Schnittfläche SF und der Gesenkseitenfläche eingeschlossen ist und der dem im allgemeinen Beschreibungsteil benannten Winkel zwischen der genannten Tangente an der Schnittfläche und der Werkstücknormalen WN entspricht. Gleichzeigt wird auch eine Verringerung des Einzugs E bewirkt.According to the previous definitions, the die is equal or oversized to the workpiece, but here it also causes a reduction, preferably even an elimination, of the angle a that is included in this sectional view between the cut surface SF and the side face of the die and that named in the general part of the description angle between the mentioned tangent on the cutting surface and the workpiece normal WN. At the same time, a reduction in the draw-in E is also effected.

Erkennbar ist in der Figur 2, dass die Schnittfläche SF an der Gesenkseitenfläche anliegt, der Winkel α somit hier eliminiert ist, abgesehen von der gratseitig verrundeten Kante und der einzugsseitig im Einzug reduzierten Kante des Werkstückes ist somit die Schnittfläche SF parallel zur Werkstücknormalen WN.Can be seen in the figure 2 that the cut surface SF rests on the side surface of the die, the angle α is thus eliminated here, apart from the rounded edge on the burr side and the edge of the workpiece that is reduced on the infeed side, the cut surface SF is parallel to the workpiece normal WN.

Sowohl die Einzugsreduzierung als auch die Winkelreduzierung bei der Schnittfläche geht hier darauf zurück, dass das Gesenk GS mit seiner Gesenkbodenfläche GSB in Schließ-Hubrichtung bis über die gratseitige Werkstückoberfläche gefahren ist, somit also das Werkstück durch das Gesenk GS in einem Randbereich entlang der Schnittkontur in der Dicke verringert ist. Diese Dickenverringerung bewirkt eine Materialverschiebung in axialer Richtung und radial nach außen, wodurch die Winkelverringerung zund einzugsveringerung erzeugt ist. Gleichzeitig kann dies auch zu einer Kaltverfestigung des Materials in den randnahen Zonen Z radial innenliegend zur Schnittfläche SF.Both the indentation reduction and the angle reduction in the cut surface are due to the fact that the die GS with its die bottom surface GSB has moved in the closing stroke direction over the workpiece surface on the burr side, i.e. the workpiece has passed through the die GS in an edge area along the cutting contour the thickness is reduced. This reduction in thickness causes a material displacement in the axial direction and radially outwards, as a result of which the reduction in angle and reduction in feed is produced. At the same time, this can also lead to strain hardening of the material in the zones Z near the edge radially on the inside of the cut surface SF.

Die Figur 2C zeigt ausschnittsweise den geprägten Rand GR auf der gratseitigen Werkstückoberfläche. Bevorzugt kann die Breite des Randes GR z.B. im Bereich von 0,1 bis 1 mm liegen. Die Dickenreduzierung der Werkstückdicke in diesem Randbereich kann ebenso bevorzugt bei 0.1 bis 1 mm liegen.the Figure 2C shows a detail of the embossed edge GR on the workpiece surface on the burr side. The width of the edge GR can preferably be in the range from 0.1 to 1 mm, for example. The reduction in thickness of the workpiece thickness in this edge area can also preferably be 0.1 to 1 mm.

Die Erfindung kann hier weiterhin vorsehen, dass das Radius der Prägerundung PR zumindest im Wesentlichen gleich ist zur Höhe des reduzierten Einzugs beim geprägten Werkstück W2.The invention can also provide that the radius of the embossing rounding PR is at least essentially the same as the height of the reduced indentation in the embossed workpiece W2.

Es ergibt sich somit ein geprägtes Werkstück, das abgesehen vom geprägten Rand auf der grat- bzw. Einzugsseite des Werkstücks nahezu identisch ist und eine zur Werkstücknormalen WN parallele Schnittfläche SF aufweist. Ein solches Werkstück W2 bedarf keiner Nachbearbeitung mehr. Schleifprozesse zur Anpassung an die gewünschte Geometrie können somit entfallen.This results in an embossed workpiece which, apart from the embossed edge, is almost identical on the burr or draw-in side of the workpiece and has a cut surface SF parallel to the workpiece normal WN. Such a workpiece W2 no longer requires post-processing. Grinding processes to adapt to the desired geometry can thus be omitted.

Die Figuren 3 zeigen eine andere Ausführung des erfindungsgemäßen Verfahren, das auch mit dem Schritt der Randprägung gemäß Figuren 2 kombinierbar ist.the Figures 3 show another embodiment of the method according to the invention, which also includes the step of edge embossing according to FIG figures 2 can be combined.

Die Figur 3A visualisiert anhand der Linien L1 und Pfeil P1, dass das Gesenks GS ein Untermaß aufweist gegenüber dem Werkstück W1. Dies ist hier dadurch gegeben, dass die Gesenkseitenfläche GSSF des Gesenks bei der hier gezeigten äußeren Schnittkontur radial innenliegend angeordnet ist zum Grat G. Bei einer inneren Schnittkontur würde umgekehrt die Gesenkseitenfläche radial aussenliegend angeordnet sein zum Grat. Aufgrund der zum Grat G weisenden Anlaufschrägen des Gesenks GS besteht dennoch die Möglichkeit das Gesenk im Prägehub über das Werkstück W1 zu fahren.the Figure 3A visualized using the lines L1 and arrow P1 that the die GS is undersized compared to the workpiece W1. This is the case here because the die side surface GSSF of the die is arranged radially on the inside of the burr G in the outer cutting contour shown here. Conversely, with an inner cutting contour, the die side surface would be arranged radially on the outside of the burr GS there is still the possibility to move the die over the workpiece W1 in the stamping stroke.

Die Figur 3B zeigt die Situation nach der Ausführung des Prägehubs. Das Gesenk hat hier Material des Werkstückes W1 nach radial innen und axial verschoben und hierdurch sowohl den Einzu verringert also auch den Winkel der Schnittfläche SF zur Gesenkseitenfläche GSSF verringert, bzw. hier eliminiert. Die Gesenkbodenfläche ist hier nur bis in die Eben der gratseitigen Werkstückoberfläche gefahren, so dass hier kein Rand geprägt wurde, wie es die Figuren 2 beschreiben. Dennoch wäre auch eine solche Randprägung zusätzlich möglich.the Figure 3B shows the situation after the embossing stroke has been carried out. Here, the die has shifted material of the workpiece W1 radially inwards and axially, thereby reducing the insertion and reducing the angle of the cut face SF to the side face GSSF of the die, or eliminating it here. The bottom surface of the die has only gone as far as the level of the workpiece surface on the burr side, so that no edge was stamped here, as was the case in the figures 2 describe. Nevertheless, such an edge embossing would also be possible.

Die Verringerung von Schnittflächenwinkel und Einzugshöhe gehen bei dieser Ausführung somit maßgeblich auf die Wirkung des Untermaßes zwischen Gesenk und Werkstück W1 zurück, um so das geprägt Werkstück W2 zu bilden, bevorzugt, welches ohne Nachbearbeitung direkt einsatzfertig ist.In this design, the reduction in the cutting surface angle and the indentation height have a significant impact on the effect of the undersize between the die and workpiece W1, so as to form the stamped workpiece W2, which is ready for immediate use without post-processing.

Die Prägerundung PR kann auch hier so gewählt sein, dass der damit verrundete Grat einen Radius aufweist, welcher zumindest im Wesentlichen der reduzierten Einzugshöhe entspricht. Bevorzugt werden Abweichungen zwischen diesem Radius und der reduzierten Einzugshöhe von weniger als 25 % erzielt.Here, too, the embossing rounding PR can be selected such that the ridge rounded thereby has a radius which at least substantially corresponds to the reduced draw-in height. Deviations between this radius and the reduced draw-in height of less than 25% are preferably achieved.

Die Figuren 4 zeigen eine besonders bevorzugte Ausführung, die z.B. bei n-zählig drehsymmetrischen Werkstücken, wie z.B. Getriebelamellen oder Zahnrädern, bevorzugt Kettenzahnrädern eingesetzt werden kann. Es können hiermit ebenso nicht symmetrische Werkstücke hergestellt werden oder auch solche, die nur abschnittsweise, insbesondere an wenigstens einem Abschnitt der gestanzten / feingeschnittenen Umfangskontur eine Verzahnung aufweisen. Die Figur 4A zeigt eine Schnittdarstellung der Prägevorrichtung parallel zur Hubrichtung bzw. parallel zur Werkstücknormalen WN. Das hier gezeigte noch ungeprägte Werkstück W1 weist wiederum einen Einzug der Höhe E auf, einen Grat G und eine zur Werkstücknormalen WN nicht-parallel, schräggestellte Schnittfläche SF.the figures 4 show a particularly preferred embodiment, which can be used, for example, in the case of n-fold rotationally symmetrical workpieces, such as transmission disks or gear wheels, preferably sprocket wheels. It can also be used to produce non-symmetrical workpieces or workpieces that have teeth only in sections, in particular on at least one section of the punched/fine-blanked peripheral contour. the Figure 4A shows a sectional view of the embossing device parallel to the stroke direction or parallel to the workpiece normal WN. The still unembossed workpiece W1 shown here again has an indentation of the height E, a burr G and a cut surface SF that is not parallel to the workpiece normal WN and is inclined.

Das Werkstück W1 wird hier von einem Gesenk umschlossen, das ein Gesenkoberteil GSO und ein Gesenkunterteil GSU aufweist. In den Abschnitten A1 und A2 weisen die beiden Gesenkteile GSO und GSU jeweils eine Prägerundung PR auf. Hierbei dient die Prägerundung PR des Gesenkunterteiles GSU dazu den Grat mit einem gewünschten Radius zu verprägen, wobei die Prägerundung PR des Gesenkoberteiles GSO die Einzugsreduzierung auf den Wert E1 begrenzt, da beim Prägen verpresstes Material hierdurch im Fluss beschränkt wird.The workpiece W1 is enclosed here by a die that has an upper die part GSO and a lower die part GSU. In the sections A1 and A2, the two die parts GSO and GSU each have an embossed rounding PR. The embossing rounding PR of the lower part of the die GSU serves to stamp the burr with a desired radius, the embossing rounding PR of the upper part of the die GSO limiting the feed reduction to the value E1, since the flow of material pressed during stamping is restricted as a result.

Erkennbar ist, dass in dieser Schnittdarstellung A-A, welche der Schnittebene A-A der Figur 4B entspricht, die Gesenkteile ein Übermaß haben gegenüber dem Werkstück W1, bzw. dessen Schnittfläche SF. Im Vergleich mit Figur 4B, wo das Gesenk gestrichelt dargestellt ist, ist erkennbar, dass dieses Übermaß nur vorliegt in einem Zahnspitzenbereich eines Zähne aufweisenden Werkstückes W1, z.B. von einem nur in wenigstens einem Teilbereich Zähne aufweisenden Werkstück, wie z.B. bei einem Sitzverstell-Element eines KFZ oder auch von einem als Zahnrad, bevorzugt Kettenzahnrad gestanzten / feingeschnittenen Werkstückes W1.It can be seen that in this sectional view AA, which is the sectional plane AA Figure 4B corresponds, the die parts have an oversize compared to the workpiece W1, or its cut surface SF. In comparison with Figure 4B , where the die is shown in broken lines, it can be seen that this excess is only present in a tooth tip area of a workpiece W1 having teeth, eg from a workpiece that has teeth only in at least a partial area, such as, for example, in the case of a seat adjustment element of a motor vehicle or also from a workpiece W1 stamped/fine-blanked as a gear wheel, preferably a sprocket wheel.

Beide Figuren lassen weiterhin eine erfindungswesentliche Ausführung erkennen, gemäß der der Abstand der beiden Gesenkteile in Hubrichtung H sich vom Werkstückinneren betrachtet in Richtung zur Schnittfläche verringert. Diese Abstandsverringerung liegt im Bereich B beider Gesenkteile vor, welcher sich gemäß Figur 4B über die Zahnspitze erstreckt. Dieser Bereich kann sich ggfs. auch über die gesamte Zahnhöhe erstrecken, ist jedoch zumindest im Zahnspitzenbereich angeordnet.Both figures also reveal an embodiment that is essential to the invention, according to which the distance between the two die parts in the stroke direction H decreases, viewed from the interior of the workpiece, in the direction of the cut surface. This distance reduction is in the area B of both die parts, which according to Figure 4B extends over the tooth tip. If necessary, this area can also extend over the entire tooth height, but is arranged at least in the tooth tip area.

Durch diese Ausführung wird bewirkt, dass beim Prägen nicht nur der Grat G verrundet und der Einzug E zu E1 verringert wird, sondern es wird auch eine Werkstückdickenreduzierung am Werkstück W1 mit einer von radial innen in Richtung nach radial außen zunehmenden Dickenreduzierung an einem jeweiligen Zahn des Zähne aufweisenden Werkstückes, insbesondere Zahnrades erzeugt. Das aus den Bereich B im Werkstück verpresste Material findet dabei Platz im Abstandsbereich zwischen der Schnittfläche und der Gesenkseitenfläche, aufgrund des dort gegebenen Übermaßes.This design not only rounds off the burr G during stamping and reduces the indentation E to E1, but also reduces the thickness of the workpiece on the workpiece W1 with a reduction in thickness that increases from radially inwards in the direction of the radially outwards on a respective tooth of the Teeth having workpiece, in particular gear generated. The material pressed from area B in the workpiece finds space in the space between the cut surface and the side surface of the die, due to the excess there.

Eine solche sowohl gratseitig als auch einzugseitig identisch erzeugte Dickenreduzierung an jedem Zahn des Zähen aufweisenden Werkstückes, insbesondere Zahnrades kann z.B. einen Einlaufbereich des Werkstück-Zahnes bilden zum erleichterten Einlaufen des Zahnes in ein jeweiliges Kettenglied.Such a reduction in thickness, which is identically generated on both the burr side and the feed side, on each tooth of the toothed workpiece, in particular a gear wheel, can, for example, form a lead-in area of the workpiece tooth for easier running-in of the tooth into a respective chain link.

Die Figur 4B zeigt weiterhin, dass das Gesenk, bzw. die beiden Gesenkteile GSO und GSU im jeweiligen Zahnbasisbereich bzw. Zahnfußbereich ein Untermaß aufweisen, also die Gesenkteile mit ihren Gesenkseitenflächen GSF in Hubrichtung betrachtet innerhalb des Werkstückes W1 stehen.the Figure 4B also shows that the die or the two die parts GSO and GSU are undersized in the respective tooth base area or tooth root area, i.e. the die parts with their die side surfaces GSF are within the workpiece W1 viewed in the stroke direction.

Durch Anlaufschrägen wird wiederum ermöglicht, dass beim Prägeschritt das Gesenk, insbesondere dessen unteres Gesenkteil GSU über den Grat G des Werkstückes herüberfahren kann, diesen verprägt und gleichzeitig auch den Winkel der Schnittfläche SF zur Werkstücknormalen durch Materialfluss reduziert oder bevorzugt eliminiert. So kann im Zahnfußbereich, insbesondere im Bereich von z.B. bis zu 50% der Zahnhöhe über dem Zahnfußbereich die Schnittfläche zur Werkstücknormalen parallelisiert werden, insbesondere so den Eingriff zwischen den dortigen Zahnflächen und einer Kettengliedachse verbessern.In turn, starting bevels make it possible for the die, in particular its lower die part GSU, to move over the burr G of the embossing step Workpiece can move over, this embossed and at the same time reduces the angle of the cut surface SF to the workpiece normal through material flow or preferably eliminated. Thus, in the tooth root area, especially in the area of, for example, up to 50% of the tooth height above the tooth root area, the cutting surface can be made parallel to the workpiece normal, in particular improving the engagement between the tooth surfaces there and a chain link axis.

Bevorzugt ergibt sich auch bei dieser Verfahrensvarianten ein unmittelbar nach dem Prägeschritt einsatzfähiges Werkstück, insbesondere Zähne aufweisenden Werkstückes und bevorzugt Kettenzahnrad, dass keiner oder nur einer deutlich gegenüber dem Stand der Technik reduzierten Nacharbeit bedarf.This method variant also preferably results in a work piece that can be used immediately after the embossing step, in particular a work piece having teeth and preferably a sprocket wheel, which requires no rework or only a significantly reduced rework compared to the prior art.

Claims (12)

  1. Method for producing stamped parts (W2), in particular workpieces having transmission plates or teeth, in particular gear wheels, in which a stamped, in particular fine-blanked, workpiece (W1) is placed in an embossing device and the burr (G), which is created on the workpiece (W1) during stamping, is rounded by way of a die (GS) of the embossing device, wherein, using the same stroke of the embossing device (GS) by way of which the rounding of the burr is performed, the height of the indentation (E), which is created during stamping, is also reduced, characterized in that, using the same stroke of the embossing device by way of which the rounding of the burr is performed, the angle (α) between a tangent of the cutting face (SF), which extends between the burr-side and the indentation-side of the workpiece (W1), and the workpiece normal (WN) is also reduced, in particular completely eliminated, in particular in the case of workpieces (W1) having a circular contour the conicity of the cutting face (SF) is reduced, preferably eliminated.
  2. Method according to Claim 1, characterized in that the die (GS) of the embossing device, having an undersize relative to the workpiece (W1), in particular to the position of the burr (G) on the workpiece (W1), travels across the burr (G) so as to approach from the burr-side of the workpiece (W1).
  3. Method according to Claim 2, characterized in that material of the workpiece (W1), by way of a ramp on the die (GS) that points towards the workpiece (W1), is displaced in the direction towards the interior of the workpiece and/or towards the indentation side.
  4. Method according to Claim 2 or 3, characterized in that the absolute value of the undersize corresponds to at least 50% of the spacing which, when measured in a direction parallel to the workpiece plane on the stamped workpiece (W1), is present on the cutting face (SF) between the indentation end and the tip of the burr.
  5. Method according to one of the preceding claims, characterized in that the die (GS) that rounds the burr has a radius (PR) provided for rounding the burr, said radius (PR) being smaller than the indentation height of the indentation (E) which is created during stamping, and a reduction of the indentation is performed conjointly with the rounding of the burr, said reduction of the indentation being performed to an indentation height that is smaller than or equal to this radius (PR).
  6. Method according to one of the preceding claims, characterized in that, using the die (GS) of the embossing device, a periphery (GR) is embossed running along the burr-side stamped contour, in particular fine-blanked contour, so as to be adjacent to the rounded burr, the workpiece thickness in the region of said periphery (GR) being reduced in relation to a workpiece region lying outside the periphery, in particular wherein a work hardening of the workpiece (W2) in the peripheral region is effected by way of the generation of the periphery.
  7. Method according to one of the preceding claims, characterized in that the die (GS) of the embossing device, which travels across the burr (G) and rounds the latter while approaching from the burr side, is configured as a bell or sleeve which surrounds at least one of the two ejectors (A1, A2) between which the workpiece (W1, W2) is clamped during the rounding of the burr.
  8. Method according to one of the preceding claims, characterized in that the embossing device has a die upper part (GSO) and a die lower part (GSU), the mutual spacing thereof, when viewed in the direction of the stroke (H), decreasing in a direction perpendicular to the direction of the stroke (H), in particular thus decreasing from the interior of the workpiece towards the cutting face (SF) of the workpiece (W1, W2), and a reduction of the workpiece thickness that increases in the direction towards the cutting face is also generated on the burr-side and the indentation-side on the workpiece (W1, W2), preferably in the same stroke of the embossing device by way of which the rounding of the burr is performed.
  9. Method according to Claim 8, characterized in that the reduction of the workpiece thickness is generated in a respective tooth region, preferably across the entire respective tooth region between the tooth tip and the tooth base of a workpiece that has teeth and is to be formed by the workpiece (W1, W2), in particular of a gear wheel, preferably a chain sprocket wheel.
  10. Method according to Claim 9, characterized in that, at least in a surrounding region about a respective tooth tip, at least one of the die parts (GSO, GSU), preferably the die upper part (GSO) and the die lower part (GSO), has/have an oversize relative to the workpiece, and as a result thereof a spacing region between the workpiece cutting face (SF) and the die part (GSO, GSU) into which workpiece material is displaced during the reduction of the workpiece thickness is formed.
  11. Method according to Claim 10, characterized in that, below the afore-mentioned surrounding region of a respective tooth, at least one of the die parts, preferably the die upper part and the die lower part, has/have an undersize relative to the workpiece.
  12. Method according to one of Claims 9 to 11, characterized in that, as a result of the reduction of the workpiece thickness between the die parts (GSU, GSO), the final ready-for-use tooth geometry, preferably the entire ready-for-use workpiece (W2), is embossed.
EP17000913.8A 2017-05-30 2017-05-30 Method for manufacturing stamped parts Active EP3409392B1 (en)

Priority Applications (7)

Application Number Priority Date Filing Date Title
ES17000913T ES2941059T3 (en) 2017-05-30 2017-05-30 Manufacturing method of stamped parts
EP17000913.8A EP3409392B1 (en) 2017-05-30 2017-05-30 Method for manufacturing stamped parts
JP2018095358A JP6726701B2 (en) 2017-05-30 2018-05-17 Method for manufacturing stamped parts
KR1020180061119A KR20180131445A (en) 2017-05-30 2018-05-29 Method for Producing Stamped Parts
CN201810528403.1A CN108971295B (en) 2017-05-30 2018-05-29 Method for producing a stamped part
US15/993,049 US11059087B2 (en) 2017-05-30 2018-05-30 Method for producing stamped parts
KR1020200040547A KR102253535B1 (en) 2017-05-30 2020-04-02 Method for Producing Stamped Parts

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DE102019213377A1 (en) * 2019-09-04 2021-03-04 Robert Bosch Gmbh Method of manufacturing a parting tool
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CN116603916B (en) * 2023-05-30 2024-06-14 东莞太阳茂森精密金属有限公司 Die and process for solving burrs at continuous die connecting position

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CN108971295B (en) 2020-10-27
ES2941059T3 (en) 2023-05-16
US11059087B2 (en) 2021-07-13
KR20180131445A (en) 2018-12-10
US20180345350A1 (en) 2018-12-06
EP3409392A1 (en) 2018-12-05
JP6726701B2 (en) 2020-07-22
JP2018202482A (en) 2018-12-27
CN108971295A (en) 2018-12-11
KR102253535B1 (en) 2021-05-18

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