EP3409392B1 - Procédé de fabrication de pièces estampées - Google Patents

Procédé de fabrication de pièces estampées 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
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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
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German (de)
English (en)
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EP3409392A1 (fr
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/es
Priority to EP17000913.8A priority patent/EP3409392B1/fr
Priority to JP2018095358A priority patent/JP6726701B2/ja
Priority to CN201810528403.1A priority patent/CN108971295B/zh
Priority to KR1020180061119A priority patent/KR20180131445A/ko
Priority to US15/993,049 priority patent/US11059087B2/en
Publication of EP3409392A1 publication Critical patent/EP3409392A1/fr
Priority to KR1020200040547A priority patent/KR102253535B1/ko
Application granted granted Critical
Publication of EP3409392B1 publication Critical patent/EP3409392B1/fr
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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)

Claims (12)

  1. Procédé de fabrication de pièces découpées à la presse (W2), en particulier de disques d'engrenage ou de pièces présentant des dents, en particulier de roues dentées, au cours duquel une pièce découpée (W1), en particulier découpée avec précision, est placée dans un dispositif d'estampage, et la bavure (G) créée sur la pièce (W1) lors de la découpe est arrondie à l'aide d'une matrice (GS) du dispositif d'estampage, dans lequel la même course du dispositif d'estampage (GS) avec laquelle l'arrondissage de bavure est effectué diminue aussi la hauteur du retrait (E) créé lors de la découpe,
    caractérisé en ce que la même course du dispositif d'estampage avec laquelle l'arrondissage de bavure est effectué diminue aussi, en particulier élimine complètement, l'angle (a) entre une tangente de la tranche (SF) qui s'étend entre le côté bavure et le côté retrait de la pièce (W1) et la normale de la pièce (WN), en particulier la conicité de la tranche (SF) étant diminuée, de préférence éliminée, pour des pièces (W1) à contour circulaire.
  2. Procédé selon la revendication 1, caractérisé en ce que la matrice (GS) du dispositif d'estampage passe sur la bavure (G) en venant du côté bavure de la pièce (W1) avec une sous-cote par rapport à la pièce (W1), en particulier par rapport à la position de la bavure (G) sur la pièce (W1).
  3. Procédé selon la revendication 2, caractérisé en ce qu'un biseau d'attaque sur la matrice (GS), tourné vers la pièce (W1), refoule la matière de la pièce (W1) en direction de l'intérieur de la pièce et/ou vers le côté retrait.
  4. Procédé selon la revendication 2 ou 3, caractérisé en ce que la quantité absolue de la sous-cote correspond à au moins 50 % de la distance qui est présente sur la pièce découpée (W1) au niveau de la tranche (SF) entre l'extrémité de retrait et la pointe de bavure, mesurée dans une direction parallèle au plan de pièce.
  5. Procédé selon l'une quelconque des revendications précédentes, caractérisé en ce que la matrice (GS) qui arrondit la bavure présente un rayon (PR), prévu pour l'arrondissage de bavure, qui est inférieur à la hauteur de retrait du retrait (E) créé lors de la découpe, et une réduction de retrait est effectuée avec l'arrondi de bavure jusqu'à une hauteur de retrait qui est inférieure ou égale à ce rayon (PR).
  6. Procédé selon l'une quelconque des revendications précédentes, caractérisé en ce que la matrice (GS) du dispositif d'estampage estampe de manière adjacente à la bavure arrondie une arête (GR) s'étendant le long du contour de découpage côté bavure, en particulier du contour de découpage de précision, au niveau de laquelle l'épaisseur de pièce est réduite par rapport à une zone de pièce située à l'extérieur de l'arête, en particulier dans lequel la génération de l'arête provoque un écrouissage de la pièce (W2) dans la zone d'arête.
  7. Procédé selon l'une quelconque des revendications précédentes, caractérisé en ce que la matrice (GS) du dispositif d'estampage, venant du côté bavure en passant sur la bavure (G) et en arrondissant celle-ci, est réalisée sous forme de cloche ou de douille qui entoure au moins l'un des deux éjecteurs (A1, A2) entre lesquels la pièce (W1, W2) est serrée pendant l'arrondissage de la bavure.
  8. Procédé selon l'une quelconque des revendications précédentes, caractérisé en ce que le dispositif d'estampage présente une partie de matrice supérieure (GSO) et une partie de matrice inférieure (GSU) dont l'espacement mutuel, vu dans la direction de course (H), diminue dans une direction perpendiculaire à la direction de course (H), diminuant ainsi en particulier de l'intérieur de la pièce vers la tranche (SF) de la pièce (W1, W2), et de préférence sur la même course, le dispositif d'estampage, qui effectue l'arrondissage de la bavure, effectue aussi côté bavure et côté retrait sur la pièce (W1, W2) une réduction d'épaisseur de pièce augmentant en direction de la tranche.
  9. Procédé selon la revendication 8, caractérisé en ce que la réduction d'épaisseur de pièce est générée dans une zone dentée respective, de préférence sur toute la zone dentée respective entre la pointe de dent et la base de dent d'une pièce présentant des dents, à former par la pièce (W1, W2), en particulier d'une roue dentée, de préférence d'une roue d'entraînement à chaîne.
  10. Procédé selon la revendication 9, caractérisé en ce qu'au moins dans une zone environnante autour d'une pointe de dent respective, au moins l'une des parties de matrice (GSO, GSU), de préférence la partie de matrice supérieure (GSO) et la partie de matrice inférieure (GSU), présente une surcote par rapport à la pièce, et ainsi une zone d'espacement est formée entre la tranche de pièce (SF) et la partie de matrice (GSO, GSU) dans laquelle la matière de la pièce est refoulée pendant la réduction de l'épaisseur de la pièce.
  11. Procédé selon la revendication 10, caractérisé en ce qu'au-dessous de ladite zone d'environnement d'une dent respective, au moins l'une des parties de matrice, de préférence la partie de matrice supérieure et la partie de matrice inférieure, présente une sous-cote par rapport à la pièce.
  12. Procédé selon l'une quelconque des revendications 9 à 11, caractérisé en ce que la réduction d'épaisseur de pièce entre les parties de matrice (GSU, GSO) estampe la géométrie de dent définitive, prête à l'utilisation, de préférence toute la pièce (W2) prête à l'utilisation.
EP17000913.8A 2017-05-30 2017-05-30 Procédé de fabrication de pièces estampées Active EP3409392B1 (fr)

Priority Applications (7)

Application Number Priority Date Filing Date Title
ES17000913T ES2941059T3 (es) 2017-05-30 2017-05-30 Método de fabricación de piezas troqueladas
EP17000913.8A EP3409392B1 (fr) 2017-05-30 2017-05-30 Procédé de fabrication de pièces estampées
JP2018095358A JP6726701B2 (ja) 2017-05-30 2018-05-17 打抜き部品を製造するための方法
KR1020180061119A KR20180131445A (ko) 2017-05-30 2018-05-29 스탬핑된 부품을 제조하기 위한 방법
CN201810528403.1A CN108971295B (zh) 2017-05-30 2018-05-29 用于制造冲裁件的方法
US15/993,049 US11059087B2 (en) 2017-05-30 2018-05-30 Method for producing stamped parts
KR1020200040547A KR102253535B1 (ko) 2017-05-30 2020-04-02 스탬핑된 부품을 제조하기 위한 방법

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP17000913.8A EP3409392B1 (fr) 2017-05-30 2017-05-30 Procédé de fabrication de pièces estampées

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EP3409392A1 EP3409392A1 (fr) 2018-12-05
EP3409392B1 true EP3409392B1 (fr) 2022-12-28

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EP (1) EP3409392B1 (fr)
JP (1) JP6726701B2 (fr)
KR (2) KR20180131445A (fr)
CN (1) CN108971295B (fr)
ES (1) ES2941059T3 (fr)

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DE102019213377A1 (de) * 2019-09-04 2021-03-04 Robert Bosch Gmbh Verfahren zur Herstellung eines Trennwerkzeugs
CN114242952B (zh) * 2021-12-17 2023-12-08 蜂巢能源科技(无锡)有限公司 一种锂离子电池电极极片成型方法及成型装置
KR102538966B1 (ko) * 2023-02-22 2023-06-01 대우공업 (주) 버(burr) 커팅부가 구비된 프레스 성형장치
CN116603916B (zh) * 2023-05-30 2024-06-14 东莞太阳茂森精密金属有限公司 一种解决连续模连料位置毛刺的模具及工艺

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Publication number Publication date
KR20200052252A (ko) 2020-05-14
CN108971295B (zh) 2020-10-27
ES2941059T3 (es) 2023-05-16
US11059087B2 (en) 2021-07-13
KR20180131445A (ko) 2018-12-10
US20180345350A1 (en) 2018-12-06
EP3409392A1 (fr) 2018-12-05
JP6726701B2 (ja) 2020-07-22
JP2018202482A (ja) 2018-12-27
CN108971295A (zh) 2018-12-11
KR102253535B1 (ko) 2021-05-18

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