EP2198988B1 - Procédé de poinçonnage en plusieurs étapes - Google Patents

Procédé de poinçonnage en plusieurs étapes Download PDF

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Publication number
EP2198988B1
EP2198988B1 EP08022325A EP08022325A EP2198988B1 EP 2198988 B1 EP2198988 B1 EP 2198988B1 EP 08022325 A EP08022325 A EP 08022325A EP 08022325 A EP08022325 A EP 08022325A EP 2198988 B1 EP2198988 B1 EP 2198988B1
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EP
European Patent Office
Prior art keywords
edge
punching
insert
cutting edge
die
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
EP08022325A
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German (de)
English (en)
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EP2198988A1 (fr
Inventor
Werner Erlenmaier
Rainer Hank
Jens Kappes
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.)
Trumpf Werkzeugmaschinen SE and Co KG
Original Assignee
Trumpf Werkzeugmaschinen SE and Co KG
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Priority to EP08022325A priority Critical patent/EP2198988B1/fr
Publication of EP2198988A1 publication Critical patent/EP2198988A1/fr
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Publication of EP2198988B1 publication Critical patent/EP2198988B1/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
    • 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
    • B21D28/00—Shaping by press-cutting; Perforating
    • B21D28/02—Punching blanks or articles with or without obtaining scrap; Notching
    • B21D28/12—Punching using rotatable carriers

Definitions

  • the invention relates to a method for two-stage punching according to the preamble of claim 1 and a method for three-stage punching according to the preamble of claim 2.
  • a method for two-stage punching according to the preamble of claim 1 is for example in US-A-20080098788 or in the US-A-4477537 disclosed.
  • the shear cutting process takes place in four phases.
  • a stamp coming from above initially sets in the first phase on the surface of the sheet and deforms it in the second phase, the plastic phase, down into the opening of a die.
  • the inner contour of the opening substantially corresponds to the outer contour of the punch and is only a few tenths of a millimeter larger depending on the sheet thickness to be processed.
  • the so-called cutting creates a Kanteneinzug, which forms a transition radius of the upper sheet surface to the punched opening.
  • the third phase follows, in which the sheet is cut by the punch of the punch and the cut surface is formed.
  • the tension in the material becomes so great that it tears along the cutting contour.
  • the material is bent down in the fourth phase, the "material separation" in the transition zone between the punched opening and the lower surface and ruptures, so that a burr is formed.
  • DE 27 27 445 B1 a punching tool set and a punching tool according to the preamble of claim 1 and 2.
  • Fig. 1 is a perspective view of a punching machine 1.
  • An essential part of the punching machine 1 is a C-frame 2.
  • the C-frame 2 consists of a torsionally rigid welded steel construction.
  • a hydraulic unit 3 is provided, which drives the movement of the plunger 6 with the upper tool holder 51.
  • a lower tool holder 4 On the lower inside of the C-frame 2, a lower tool holder 4 is provided for receiving later-described tool lower parts 5 of punching tools.
  • the plunger 6 with the upper tool holder 51 and a tool upper part 7 shown therein is provided on the upper inside of the C-frame 2.
  • a plunger control 9, as well as all drives for moving a sheet to be machined 10 and actuators for special functions are controlled by a machine control device, not shown, in a separate housing.
  • the engine control device has as input and output means on a keyboard and a monitor.
  • the control functions are performed by microcontrollers. Processing programs and operating parameters are stored in a memory area of the machine control device.
  • the plunger control 9 controls the movement of the plunger 6 with the upper tool holder 51 in the Z direction.
  • the stroke of the plunger 6 can be carried out either as a maximum possible stroke down, or only up to a predetermined stroke length. In the case in which the stroke is carried out only up to the predetermined stroke length, then following the stroke in the predetermined stroke length of the stroke can then be carried out either further down, or the plunger 6 moves again in the direction of its upper end position.
  • the lower tool part 5 by means of a first rotary drive 16, and the upper tool part 7 in accordance with the lower tool part 5 rotatable by 360 ° and in any angular position detectable, for which a second rotary drive 8 is present. This is also controlled by the engine control device.
  • the lower tool holder 4 also has a drive device 17 in the Z direction.
  • the maximum possible stroke can be performed upwards, or the stroke can only be executed up to a predetermined stroke length. Following the stroke up to the predetermined stroke length, the stroke can then either be carried out further, or the lower tool holder moves back in the direction of its lower end position.
  • a machine table 11 and a cross rail 12 with a linear magazine 15 is also arranged.
  • clamping claws 13 are arranged for clamping the sheet 10.
  • the clamping claws 13 can be fastened at suitable locations on the transverse rail 12.
  • the clamping claws 13 can be offset so that the sheet 10 is securely gripped, but they do not grab the sheet 10 on a surface to be machined.
  • recordings for punching tools 14 are available.
  • the machine table 11 moves in the Y direction together with the cross rail 12 to which the plate 10 is fixed with the clamping jaws 13, in a defined position, and the crossbar 12 moves in the X direction in the defined position, wherein the sheet 10 slides over the machine table 11. Then, a punching stroke is performed by the plunger 6. Following this, the next punching position is approached with the same principle.
  • the punching tools 14 are automatically changed, controlled by the machine control device, changed.
  • the cross rail 12, driven by a drive, not shown moves to a position in the X direction, so that the X position of the tool to be loaded corresponds to the X position of the lower tool holder 4.
  • the cross rail 12 then moves, together with the machine table 11, driven by a further drive, in a position in the Y direction, so that the tool lower part 5 can be received in the lower tool holder 4, and the tool upper part 7 is received in the plunger 6 can be. If a tool is present in the upper tool holder 51 and the lower tool holder 4, this is previously discharged to a free space in the linear magazine 15.
  • Fig. 2a shows a punching tool 53 for cutting from a tool set for multi-stage punching.
  • the upper tool part 7 has a punching die 18, with the upper region, a shank 52, of which the upper tool part 7 is received positively in the plunger 6.
  • the lower side of the punching die 18 has a first shape designated as a first shape, namely a recess 22 into which the sheet metal 10 is pressed during machining, which basically represents the characteristic of a die.
  • the circumferential edge of the recess 22 forms with the lower surface of the punching die 18, a first cutting edge 23, on which the sheet 10 is cut.
  • an adjusting ring 19 is clamped with an adjusting wedge 20.
  • the adjusting wedge 20 is positively connected in a recorded state of the tool 53 in the punching machine with a driver of the upper rotary drive 8, so that there is a rotation of the upper tool part 7. Due to the clamping of the adjusting ring 19 on the shaft of the punching die 18, the orientation of the tool lower part is required, which is required for non-circular punches located in an axis 21 of the tool 53, or for any punches whose center lies outside the axis 21, adjustable.
  • a hold-down 25 is attached from a resilient plastic by means of a retaining ring 24.
  • the hold-down prevents the pulling up of the sheet 10 during the upward movement of the punching die 18 after the cutting operation.
  • the tool lower part 5 has an insert 26 with a shape referred to as a third shape, which is designed such that the insert has a first cutting edge 27 on its upper side having a second cutting edge 28.
  • the contour of the second cutting edge 28 substantially corresponds to the contour of the first cutting edge 23.
  • the contour of the second cutting edge 28 is circumferentially farther from the axis 21 with respect to the tool axis 21 so as to form a so-called negative cutting gap with the first cutting edge 23 ,
  • the negative cutting gap is used in a closed section, ie in a punching of sheets, wherein both the punched-out part (slug) and the sheet from which is punched, the part to be produced, so the good part can represent.
  • the first cutting edge 27 is raised above a stop surface 49.
  • the stop surface 49 forms the surface on which rests the underside of the sheet 10 when cutting, so that by the height of the cutting edge 27, a defined gate is introduced upwards into the sheet 10.
  • the length of the cutting edge 27 upward is less than the thickness of the sheet 10 to be machined, and to be determined empirically depending on the sheet thickness and the sheet type to perform the cutting with the desired result in the method described below.
  • the length of the cutting edge 27 is greater than the thickness of the sheet to be machined 10.
  • the penetration depth of the cutting edge 27 is determined by the punching machine by the stroke is limited in a predetermined manner.
  • the lower tool part 5 on an ejector 30 which is mounted axially displaceable by a retaining ring 31 to the axis 21 in a plate 29.
  • the ejector 30 is urged by an elastic member 32 in a limited by the retaining ring 31 upper end position.
  • the sheet 10 is moved after the punching by the ejector 30 upwards, so that the first Cutting edge 27 again emerges from the recess 10 produced in the sheet 10, and the sheet 10 can be moved to a like Fig. 1 To carry out described tool change.
  • the plate 29 has a special contour in order to be recorded by the lower tool holder 4 positively and without play.
  • Fig. 2b shows a punching tool 54 for counter cutting from the tool set for multi-stage cutting. Elements identical to those in Fig. 2a are not described again.
  • a punch 50 has a second cutting edge 33 in a shape designated as a second shape.
  • the second cutting edge 33 forms a third cutting edge 34 through the lower surface and the lateral peripheral surface.
  • the third cutting edge 34 substantially corresponds in contour to the second cutting edge 28, as in FIG Fig. 2a shown.
  • the length of the second cutting edge 33 is greater than the thickness of the sheet 10 to be machined.
  • the punch 54 in Fig. 2b a scraper 35 on.
  • the scraper 35 has the same function as the hold-down 25 in Fig. 2a but is held and moved separately by the punching machine 1.
  • the tool lower part 5 points in Fig. 2b an insert 36 forming a second die in a form referred to as a fourth die.
  • a fourth cutting edge 38 is formed.
  • the contour and the dimension of the fourth cutting edge 38 essentially correspond to those of the first cutting edge 23 (FIG. Fig. 2a ).
  • the insert 36 is also received here in the plate 29, which has the identical outer contour as the plate 29 in Fig. 2a to be received in the same lower tool holder 4.
  • a double tool is shown both for cutting and counter cutting.
  • the upper tool part 7 has a punch shaft 39. With the help of the punch shaft 39, the upper tool holder 7 is received in the upper tool holder 6 positively and without play.
  • On the stamp shank 39 of the adjusting wedge 20 is positively secured.
  • the adjusting wedge 20 also serves here to rotate the complete tool upper part 7 about the axis 21.
  • a base body 40 is fixed, in which in turn a first insert 41 and a second insert 42 are received.
  • the inserts 41, 42 each have a central axis 47, 48, which are diametrically opposite with respect to the tool axis 21, and have an identical distance from the tool axis 21.
  • the main body 40 is substantially formed as a disc with an integrally formed centrally upwardly projecting pin.
  • openings are recessed.
  • the size of the openings is formed as a function of the size of the first and the second insert 41, 42.
  • the pin has in the region of the lower end facing the disc on a paragraph, and at its upper end a thread.
  • the basic body is pulled upwards and is supported by the paragraph in the region of the lower end of a paragraph in an axial bore of the stamp shaft.
  • the base body is axially positively connected to the stamp shank 39 and secured by clamping against rotation relative to the stamp shank 39.
  • the inserts 41, 42 each have a cylindrical shape. To the in Fig. 3 shown upper ends of the inserts 41, 42, an outer circumferential edge is provided in each case. In the inner areas of the edge is not provided.
  • the respective paragraph is not circumferentially continued in the main body, so that the edge, which is complementary to the respective paragraph, allows a positive connection against rotation.
  • the two inserts 41, 42 are slidably mounted in the base body 40 in the direction of the axis 21, so that when an occurrence of a force in the direction of the axis 21 in Fig. 3 upward, the first insert 41 and the second insert 42 are basically pushed up to a stop on the stamp shank 39 upwards.
  • a specially shaped gear 43 is inserted axially between the punch shaft 39 and the base body 40.
  • the gear 43 is basically formed as a disc with an outer downwardly projecting edge.
  • the inner surface of the Rands forms with the round outer surface of the disc of the base body 40 a sliding bearing.
  • the edge has a conventional toothing.
  • Disposed in the disc-shaped area of the toothed wheel is a sector which has at least the size of a projection of the larger of the two inserts in the direction of the axis 21, so that one of the inserts 41, 42 can pass through the freed-up sector. Due to the presence of this free sector over the first insert 41 in Fig. 3 this is pushed up when striking a force on the bottom surface of the disc of the base body 40 upon the occurrence of a force up through the cutout in the gear until it hits.
  • the second insert 42 above the in Fig. 3 the clearance is not present, is pressed at a force from below against the lower surface of the gear 43 and thus not moved.
  • the gear 43 By turning the gear 43 about the axis 21 by an angle of 180 ° relative to the position in Fig. 3
  • the first insert 41 is prevented from moving and the second insert 42 is moved upward by contact with its upper surface with the underside of the punch shaft 39.
  • the position in which the first insert 41 or the second insert 42 is not movable up into the tool upper part (7) is defined as a working position A.
  • the positions of a complementary insert 45, 46 are defined by the axes 47, 48.
  • the punching position and the working position A remains the same, ie the center axis of the insert, which is in the position in which he is not insertable, is identical to the before the rotation.
  • the punch 55 in Fig. 3 points as the punch 54 in Fig. 2b a scraper 35 on.
  • the scraper in Fig. 3 contains two openings through which each of the inserts 41, 42 pass.
  • the scraper 35 is rotated simultaneously with the upper tool 7.
  • the tool lower part 5 has the third insert 45 with the axis 47 and the fourth insert 46 with the axis 48.
  • the inserts 45, 46 are received in the plate 29 and are diametrically opposite to the axis 21.
  • Their axes 47, 48 have the same distance from the tool axis 21.
  • the lower region of the first insert 41 in the upper tool part 7 substantially corresponds to the lower region of the punching die 18 in FIG Fig. 2a , It has the recess 22, which forms with the lower surface of the insert 41, the first cutting edge 23, and thus the first die.
  • the complementary use in the lower tool part 5 is the third insert 45, which has substantially the same features as the insert 26 in Fig. 2a , On its upper side, the insert 45 has the first cutting edge 27.
  • the cutting edge 27 forms at its upper circumferential edge the second cutting edge 28.
  • the contour of the second cutting edge 28 substantially corresponds to the contour of the first cutting edge 23.
  • the contour of the second cutting edge 28 is circumferentially farther away from the axis 47 with respect to the insert axis 47 so as to form a so-called negative cutting gap with the first cutting edge 23 to build.
  • the negative cutting gap is used in a closed section, ie in a punching of sheets, wherein both the punched-out part (slug) and the sheet from which is punched, the part to be produced, so the good part can represent.
  • the length of the cutting edge 27 is less than the thickness of the sheet 10 to be machined, and to be determined empirically depending on the sheet thickness and the sheet type in order to perform the cutting with the desired result described in ua method.
  • the length of the cutting edge 27 is greater than the thickness of the sheet to be machined 10.
  • the penetration depth of the cutting edge 27 is determined by the determination of the stroke of the punching machine.
  • the second cutting edge 33 forms the third cutting edge 34 through the lower surface and the lateral peripheral surface.
  • the third cutting edge 34 substantially corresponds in contour to the second cutting edge 28.
  • the length of the second cutting edge 33 is greater than the thickness of the sheet 10 to be machined.
  • the tool lower part 5 has the complementary to the second insert 42 fourth insert 46, which forms the second die. Through the surface on the upper side and the opening 37, the fourth cutting edge 38 is formed. The contour and the dimension The fourth cutting edge 38 substantially corresponds to that of the first cutting edge 23.
  • the third cutting edge 34 of the second cutting edge 33 is with respect to the tool axis 21 point-symmetrical to the second cutting edge 28 of the first cutting edge 27. This makes it possible, by a simple rotation of the punching tool 55 about the tool axis 21 by 180 °, Anlagenstaste any contour first and then counter-punch.
  • a suitable punching tool 14 is first loaded into the punching machine 1.
  • the punching tool 55 When using the punching tool 55 according to Fig. 3
  • the punching tool 55 is rotated by the punching machine 1 in such a way that the inserts 41 and 45 lie with their insert axle 47 in the working position A in the region of the toothed wheel 43 in which the insert 41 can not be pushed in the direction of the punch shaft 39 , In Fig. 3 So on the left side, so that the tool must be rotated by 180 °, but the gear 43 maintains the orientation shown.
  • the working position A can be changed by turning the gear 43 in any orientation, so that punched with non-rotationally symmetrical cutting projections 33 can be performed in any orientation.
  • the sheet 10 is positioned by the punching machine 1 so that the position to be machined in accordance with the use of the tool set Fig. 2a and Fig. 2b suitably in the range of the tool axis 21 comes to rest, or when using a tool according to Fig. 3 in the area of the insert shaft 47 comes to rest.
  • a punching stroke is performed by the punching machine 1, wherein the stroke length is predetermined so that the cutting edge 28 penetrates only so far into the sheet 10 that the sheet 10 is cut, the sheet 10 is not penetrated.
  • the specific stroke length of the plunger 6 corresponds to the maximum possible stroke length, wherein the distance between the stop surface 49 and the bottom of the associated die 18, 41 at least equal to the thickness of the sheet 10 to be processed.
  • the stroke length is determined or limited by the control device of the punching machine 1 accordingly.
  • the dies 18, 41 are exchanged for the cutting projections 27, 33, and the cutting projections 27 for the dies 36, 46.
  • a punching stroke is again performed in a third step, wherein the stroke length is predetermined so that the cutting edge 34 penetrates the sheet at least as far until the cutting edge has penetrated the sheet so far that a punched-out part is completely separated from the sheet 10. This is satisfied when the cutting edge 34 has penetrated the sheet at least to the gate on the opposite side. A complete penetration of the sheet 10 by the cutting edge 33 ensures the safe ejection of the punched-out part.
  • another tool 14 is tuned so that at the maximum stroke of the punching machine 1, the sheet is not penetrated by the cutting edge.
  • a stop surface is then provided to prevent the penetration of the cutting edge.
  • the punching tool 55 When using the punching tool 55 according to Fig. 3
  • the punching tool 55 is rotated by the punching machine 1 such that the inserts 42 and 46 lie with their insert axle 48 in the working position A in the region of the toothed wheel 43 in which the insert 42 can not be pushed in the direction of the punch shaft 39 , In Fig. 3
  • the gear 43 also retains the orientation shown.
  • the working position A can be changed by rotating the entire tool shell 7 including the gear 43 in any orientation, so that punched with non-rotationally symmetrical cutting projections 33 can be performed in any orientation.
  • a punching stroke is performed by the punching machine 1, wherein the stroke length is predetermined so that the cutting edge 34 penetrates only so far into the sheet 10 that the sheet 10 is cut, but the sheet 10 is not penetrated.
  • the stroke length is determined by the control device of the punching machine 1 accordingly.
  • an insert which has a stop surface and a cutting edge whose length is smaller than the sheet 10 to be processed.
  • the predetermined stroke length of the plunger 6 corresponds to the maximum possible stroke length, wherein the distance between the stop surface 49 and the bottom of the associated die 41 at least equal to the thickness of the sheet 10 to be processed.
  • the insert with the stop surface is then provided as a third use in the upper tool part 7 with a corresponding insert in the lower tool part 5.
  • the die 36, 46 is replaced by the cutting edge 27 and the cutting edge 33 against the die 18, 41.
  • a punching stroke is performed, wherein the penetration depth of the cutting edge 27 is less than the thickness of the sheet 10. This results on the sheet side, which is opposite to the gate produced in step 1, another gate.
  • a step 2b according to the second step, the die 18, 41 against the cutting edge 33, and the cutting edge 27 against the die 36, 46 replaced.
  • a punching stroke is again performed in a third step, the stroke length being predetermined so that the cutting edge 34 penetrates the metal sheet 10 at least as far as the cutting edge 34 has penetrated the metal sheet so far that the punched-out part is completely separated from the metal sheet 10. This is satisfied when the cutting edge 34 has penetrated the sheet 10 at least to the gate on the opposite side. A complete penetration of the sheet 10 by the cutting edge 33 ensures the safe ejection of the punched-out part.
  • the sheet 10 is then repositioned or removed for further processing.
  • the multi-stage cutting can be used not only for producing a closed cut, but also in processes in which a web contour is genibbelt, so a longer cutting edge is produced by the separation of juxtaposed shorter cuts.
  • each generation of a cut or the punching tools and punching tool can be changed, or on the other hand first a web or a larger section of a web punched and then punched after a tool change.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Perforating, Stamping-Out Or Severing By Means Other Than Cutting (AREA)

Claims (11)

  1. Procédé d'estampage en deux phases
    avec une machine à estamper comportant une réception supérieure d'outil (51), un mécanisme d'entraînement (9) pour la réception supérieure d'outil (51) dans la direction Z, une réception inférieure d'outil (4) et un dispositif de commande, et
    avec un jeu d'outils d'estampage comprenant au moins un premier outil d'estampage (53), comportant une partie supérieure d'outil (7) avec une première forme et une partie inférieure d'outil (5) avec une troisième forme complémentaire à la première forme, et un deuxième outil d'estampage (54) comportant une partie supérieure d'outil (7) avec une deuxième forme et une partie inférieure d'outil (5) avec une quatrième forme complémentaire à la deuxième forme, où la première forme est réalisée comme première matrice (18) au moins dans la partie supérieure d'outil (7) du premier outil d'estampage (53), et où la troisième forme est réalisée comme premier tranchant (27) dans la partie inférieure d'outil (5) du premier outil d'estampage (53), et où la deuxième forme est réalisée comme deuxième tranchant (33) dans la partie supérieure d'outil (7) du deuxième outil d'estampage (54), et où la quatrième forme est réalisée comme deuxième matrice dans la partie inférieure d'outil (5) du deuxième outil d'estampage (54), et où le premier tranchant (27) présente une arête de coupe (28), et le deuxième tranchant (33) une arête de coupe (34), et où le contour de l'arête de coupe (28) du premier tranchant (27) est sensiblement identique au contour de l'arête de coupe (34) du deuxième tranchant (33), la première matrice présentant un évidement (22) avec une arête de coupe (23), et le premier tranchant (27) et l'évidement (22) présentant un axe (21), et le contour de l'arête de coupe (28) du premier tranchant (27) étant plus éloigné de l'axe (21) que le contour de l'arête de coupe (23) de la première matrice (18), de manière à former un jeu de coupe négatif, ou
    avec une machine à estamper comportant une réception supérieure d'outil (51), un mécanisme d'entraînement (9) pour la réception supérieure d'outil (51) dans la direction Z, une réception inférieure d'outil (4) et un dispositif de commande, la réception supérieure d'outil (51) étant réalisée avec un premier dispositif d'entraînement en rotation (8) et la réception inférieure d'outil (4) avec un deuxième dispositif d'entraînement en rotation (16), et le dispositif de commande étant réalisé pour commander la réception supérieure d'outil (51) et la réception inférieure d'outil (4) de telle manière que celles-ci effectuent une rotation identique, celle-ci comprenant
    un outil d'estampage (55) comportant une partie supérieure d'outil (7) avec au moins un premier insert (41) et un deuxième insert (42), et une partie inférieure d'outil (5) avec un troisième insert (45), complémentaire au premier insert (41) et un quatrième insert (46), complémentaire au deuxième insert (42), le premier et le troisième, ou le deuxième et le quatrième insert étant respectivement en position de travail (A), le premier insert (41) étant réalisé comme première matrice et le troisième insert (45) étant réalisé avec un premier tranchant (27), et le deuxième insert (42) étant réalisé avec un deuxième tranchant (33) et le quatrième insert (46) étant réalisé comme deuxième matrice, et le premier tranchant (27) présentant une arête de coupe (28) et le deuxième tranchant (33) présentant une arête de coupe (34), et le contour de l'arête de coupe (28) du premier tranchant (27) étant sensiblement identique au contour de l'arête de coupe (34) du deuxième tranchant (33), la première matrice (18) présentant un évidement (22) avec une arête de coupe (23), et le premier tranchant (27) et l'évidement (22) présentant un axe (47), et le contour de l'arête de coupe (28) du premier tranchant (27) étant plus éloigné de l'axe (47) que le contour de l'arête de coupe (23) de la première matrice (18), de manière à former ainsi un jeu de coupe négatif,
    caractérisé en ce que ledit procédé comprend les étapes suivantes :
    - étape 1 : exécution d'une course d'estampage avec une longueur de course définie, la longueur de course étant déterminée pour que l'arête de coupe (28) du tranchant (27) de l'insert (26, 45) ne perce pas la tôle (10) à usiner en position de travail (A), de manière à produire une entamure ;
    - étape 2 : échange des outils d'estampage (53, 54) ou des inserts (41, 45) en position de travail (A), de manière à échanger l'insert avec le tranchant (27) contre la matrice (46), et la matrice (41) contre l'insert avec le tranchant (33) ;
    - étape 3 : exécution d'une course d'estampage avec une longueur de course définie, la longueur de course étant déterminée pour que l'arête de coupe (34) du tranchant (33) utilisé pour la coupe perce la tôle à usiner sur la face opposée, au moins jusqu'à la profondeur de l'entamure.
  2. Procédé d'estampage en trois phases
    avec une machine à estamper comportant une réception supérieure d'outil (51), un mécanisme d'entraînement (9) pour la réception supérieure d'outil (51) dans la direction Z, une réception inférieure d'outil (4) et un dispositif de commande,
    avec un jeu d'outils d'estampage comprenant au moins un premier outil d'estampage (53), comportant une partie supérieure d'outil (7) avec une première forme et une partie inférieure d'outil (5) avec une troisième forme complémentaire à la première forme, et un deuxième outil d'estampage (54) comportant une partie supérieure d'outil (7) avec une deuxième forme et une partie inférieure d'outil (5) avec une quatrième forme complémentaire à la deuxième forme, où la première forme est réalisée comme première matrice (18) au moins dans la partie supérieure d'outil (7) du premier outil d'estampage (53), et où la troisième forme est réalisée comme premier tranchant (27) dans la partie inférieure d'outil (5) du premier outil d'estampage (53), et où la deuxième forme est réalisée comme deuxième tranchant (33) dans la partie supérieure d'outil (7) du deuxième outil d'estampage (54), et où la quatrième forme est réalisée comme deuxième matrice dans la partie inférieure d'outil (5) du deuxième outil d'estampage (54), et où le premier tranchant (27) présente une arête de coupe (28), et le deuxième tranchant (33) une arête de coupe (34), et où le contour de l'arête de coupe (28) du premier tranchant (27) est sensiblement identique au contour de l'arête de coupe (34) du deuxième tranchant (33), la première matrice (18) présentant un évidement (22) avec une arête de coupe (23), et le premier tranchant (27) et l'évidement (22) présentant un axe (21), et le contour de l'arête de coupe (28) du premier tranchant (27) étant plus éloigné de l'axe (21) que le contour de l'arête de coupe (23) de la première matrice (18), de manière à former un jeu de coupe négatif, ou
    avec une machine à estamper comportant une réception supérieure d'outil (51), un mécanisme d'entraînement (9) pour la réception supérieure d'outil (51) dans la direction Z, une réception inférieure d'outil (4) et un dispositif de commande, la réception supérieure d'outil (51) étant réalisée avec un premier dispositif d'entraînement en rotation (8) et la réception inférieure d'outil (4) avec un deuxième dispositif d'entraînement en rotation (16), et le dispositif de commande étant réalisé pour commander la réception supérieure d'outil (51) et la réception inférieure d'outil (4) de telle manière que celles-ci effectuent une rotation identique, celle-ci comprenant
    un outil d'estampage (55) comportant une partie supérieure d'outil (7) avec au moins un premier insert (41) et un deuxième insert (42), et une partie inférieure d'outil (5) avec un troisième insert (45), complémentaire au premier insert (41) et un quatrième insert (46), complémentaire au deuxième insert (42), le premier et le troisième, ou le deuxième et le quatrième insert étant respectivement en position de travail (A), le premier insert (41) étant réalisé comme première matrice et le troisième insert (45) étant réalisé avec un premier tranchant (27), et le deuxième insert (42) étant réalisé avec un deuxième tranchant (33) et le quatrième insert (46) étant réalisé comme deuxième matrice, et le premier tranchant (27) présentant une arête de coupe (28) et le deuxième tranchant (33) présentant une arête de coupe (34), et le contour de l'arête de coupe (28) du premier tranchant (27) étant sensiblement identique au contour de l'arête de coupe (34) du deuxième tranchant (33), la première matrice (18) présentant un évidement (22) avec une arête de coupe (23), et le premier tranchant (27) et l'évidement (22) présentant un axe (47), et le contour de l'arête de coupe (28) du premier tranchant (27) étant plus éloigné de l'axe (47) que le contour de l'arête de coupe (23) de la première matrice (18), de manière à former ainsi un jeu de coupe négatif,
    caractérisé en ce que ledit procédé comprend les étapes suivantes :
    - étape 1 : exécution d'une course d'estampage avec une longueur de course définie, la longueur de course étant déterminée pour que l'arête de coupe (34) du tranchant (33) d'un poinçon (50) ou d'un insert (42) ne perce pas la tôle (10) à usiner en position de travail (A), de manière à produire une entamure ;
    - étape 2 : échange des outils d'estampage (53, 54) ou des inserts en position de travail (A), de manière à échanger l'insert avec le tranchant (33) contre la matrice (41), et la matrice (46) contre l'insert (45) avec le tranchant (27) ;
    - étape 2a : exécution d'une course d'estampage avec une longueur de course définie, la longueur de course étant déterminée pour que l'arête de coupe (28) du tranchant (27) à utiliser pour la coupe ne perce pas la tôle à usiner jusqu'à l'entamure de l'étape 1, de manière à produire une deuxième entamure ;
    - étape 2b : échange des inserts ou des outils, de manière à échanger le tranchant (27) contre la matrice (36, 46) et la matrice (18, 41) contre le tranchant (33) ;
    - étape 3 : exécution d'une course d'estampage avec une longueur de course définie, la longueur de course étant déterminée pour que l'arête de coupe (34) du tranchant (33) utilisé pour la coupe perce la tôle à usiner sur la face opposée, au moins jusqu'à la profondeur de l'entamure.
  3. Procédé selon la revendication 1 ou 2, caractérisé en ce qu'en étape 2, en cas d'utilisation d'un jeu d'outils d'estampage, les outils d'estampage (53, 54) du jeu d'outils d'estampage sont échangés.
  4. Procédé selon la revendication 1 ou 2, caractérisé en ce qu'en étape 2, en cas d'utilisation d'un outil d'estampage (55), l'outil d'estampage (55) est tourné.
  5. Procédé selon l'une des revendications précédentes, caractérisé en ce que l'outil d'estampage (55) présente un axe de rotation (21) et en ce que l'arête de coupe (34) du deuxième tranchant (33) est à symétrie ponctuelle avec l'arête de coupe (28) du premier tranchant (27) par rapport à l'axe de rotation (21) .
  6. Procédé selon l'une des revendications précédentes, caractérisé en ce que l'outil d'estampage (53, 54, 55) présente au moins un tranchant (27, 33) de longueur supérieure à l'épaisseur d'une tôle (10) à usiner.
  7. Procédé selon l'une des revendications 1 à 5 avec un outil d'estampage, où au moins un des tranchants (27, 33) présente une surface de butée (49), ainsi qu'une longueur inférieure à l'épaisseur d'une tôle (10) à usiner.
  8. Procédé selon la revendication 7, caractérisé en ce que la longueur de course en étape 1 correspond à la longueur de course maximale quand l'outil est configuré de telle manière que l'espacement entre la surface de butée (49) et la matrice (18, 41) associée correspond à l'épaisseur de tôle à usiner.
  9. Procédé selon la revendication 7 ou 8, caractérisé en ce qu'un chanfrein ou un arrondi sont formés sur le bord de transition entre le tranchant (27) et la surface de butée (49).
  10. Procédé selon l'une des revendications 1 à 7, caractérisé en ce que la longueur de course en étape 1 ne correspond pas à la longueur de course maximale.
  11. Procédé selon l'une des revendications 1 à 10 pour le formage à la presse d'une piste de came, caractérisé en ce que consécutivement à l'étape 1, il n'est pas procédé immédiatement à l'échange des outils d'estampage (53, 54) ou des inserts (41, 42, 45, 46) en position de travail (A), permettant d'échanger l'insert (42) avec le tranchant (33) contre la matrice (41), et la matrice (46) contre l'insert (45) avec le tranchant (27), mais en ce que l'étape 1 est répétée après repositionnement d'une tôle (10) à usiner, pour former une piste à la presse.
EP08022325A 2008-12-22 2008-12-22 Procédé de poinçonnage en plusieurs étapes Active EP2198988B1 (fr)

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Citations (2)

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Publication number Priority date Publication date Assignee Title
US4477537A (en) * 1982-09-23 1984-10-16 Blase Tool And Manufacturing Co., Inc. Method for producing burr-free blanks and the blanks produced thereby
US20080098788A1 (en) * 2005-01-25 2008-05-01 Aisin Aw Co., Ltd. Pressing Machine, Pressing Method, and Punched Article

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Publication number Priority date Publication date Assignee Title
DE2727445C2 (de) 1977-06-18 1979-09-06 Lange, Kurt, Prof. Dr.-Ing., 7000 Stuttgart Verfahren und Vorrichtung zum Ausschneiden und/oder Lochen von Werkstücken aus metallischen Flachwerkstoffen
DE3931320C1 (fr) 1989-09-20 1991-08-08 Feintool International Holding, Lyss, Ch
JPH0973760A (ja) 1995-09-07 1997-03-18 Sony Corp プレート原反の打抜方法とテープカセットのベースプレート
JP2000301261A (ja) * 1999-04-22 2000-10-31 Amada Co Ltd タレットパンチプレス

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Publication number Priority date Publication date Assignee Title
US4477537A (en) * 1982-09-23 1984-10-16 Blase Tool And Manufacturing Co., Inc. Method for producing burr-free blanks and the blanks produced thereby
US20080098788A1 (en) * 2005-01-25 2008-05-01 Aisin Aw Co., Ltd. Pressing Machine, Pressing Method, and Punched Article

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