EP0820821B1 - Verfahren zum Ausschneiden eines Zuschnittteils aus einer Blechplatte - Google Patents

Verfahren zum Ausschneiden eines Zuschnittteils aus einer Blechplatte Download PDF

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Publication number
EP0820821B1
EP0820821B1 EP19970401592 EP97401592A EP0820821B1 EP 0820821 B1 EP0820821 B1 EP 0820821B1 EP 19970401592 EP19970401592 EP 19970401592 EP 97401592 A EP97401592 A EP 97401592A EP 0820821 B1 EP0820821 B1 EP 0820821B1
Authority
EP
European Patent Office
Prior art keywords
cutting
punch
indentation
sheet
blank
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP19970401592
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English (en)
French (fr)
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EP0820821A1 (de
Inventor
Stéphanie Eple
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.)
Sollac SA
Original Assignee
Sollac SA
Lorraine de Laminage Continu SA SOLLAC
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
Priority claimed from FR9609358A external-priority patent/FR2751570B1/fr
Application filed by Sollac SA, Lorraine de Laminage Continu SA SOLLAC filed Critical Sollac SA
Publication of EP0820821A1 publication Critical patent/EP0820821A1/de
Application granted granted Critical
Publication of EP0820821B1 publication Critical patent/EP0820821B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • B21D28/10—Incompletely punching in such a manner that the parts are still coherent with the work
    • 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

Definitions

  • the present invention relates to the cutting of a part in a sheet blank.
  • the cutting of parts in a sheet blank is often carried out on a cutting device essentially comprising members with edges sharp, movable towards each other.
  • the devices to cut also have a blank holder to maintain the blank sheet metal in position between the die and the punch.
  • the cutting edge organs are formed, on the one hand, by a punch corresponding to the perimeter to be cut, the movement is slaved to that of a movable slide and, on the other hand, by a fixed matrix.
  • the matrix includes a shape imprint combined with said punch to obtain the desired cut.
  • the punch and the die are, as a rule, metallic and in particular made of tool steel for cutting metal sheets and the more often in carbide.
  • This technique of cutting pieces in a sheet metal blank by means of a device comprising a punch and a die is very often used, for example to make the various constituent elements of the stator electric motors, or to make magnetic circuits, or still in the automotive field in the context of making holes to lighten the structures.
  • This wear is due to the significant cutting force it is necessary to provide for cutting the workpiece and for the friction effect which product between the edge of the cut made in the sheet blank and the punch, at the time of the descent and the ascent of said punch.
  • steels whose ratio between the elastic limit and the load at break R e / R m is less than 0.8 and whose elongation percent at break A% is greater than 30, are very difficult to cut, and steels whose R e / R m ratio is between 0.9 and 1 and whose elongation at break is less than 20 are easier to cut.
  • This wear is also a function of the geometry of the part to be cut. Indeed, the pieces whose shape is very tormented and has sharp angles, for example of the stator type of an electric motor, are more difficult to cut than pieces of simple geometric shape.
  • the method consists in making a first pass during which is indented in a direction, for example from high at the bottom, then a second pass during which we perform a counterindentation in the opposite direction to the direction of the indentation, by example from bottom to top and finally a third total cutting pass in the sense of counterindentation.
  • the present invention aims to remedy these drawbacks by proposing a cutting process which makes it possible to extend the duration of life of the punch and the die, significantly reducing the effort of cutting and the friction effect, while maintaining a very small clearance between the punch and the die.
  • the present invention thus relates to a method of cutting of a part in a sheet blank as defined by the independent claims.
  • the cutting device shown in Figure 1 is constituted by a device of known type usable for cutting a blank sheet metal 1.
  • This device comprises two cutting edge members, movable towards each other which are formed, on the one hand, by a punch 2 whose movement is slaved to that of a movable slide 3 and shaped corresponding to the perimeter to be cut and, on the other hand, by a matrix 4 linked to a fixed table 5 and of form conjugate to said punch 2 to obtain the desired cut.
  • the device cutting also includes a blank holder 6 for pressing the sheet blank 1 on matrix 4.
  • the punch 2 and the die 4 each have an edge sharp respectively 7 and 8 intended to cooperate with each other in time of descent of said punch to cut the sheet blank 1.
  • the part can be constituted either by the cut part 1a in the sheet blank 1, the remaining part 1b of the sheet blank constituting the drop, either by the remaining part 1b of said sheet blank 1, the cut part constituting the fall.
  • indentation 9 The direction of formation of indentation 9 is perpendicular to the main faces of the sheet blank 1 and the direction of formation of this indentation 9 is directed from a first main face to the other face main, regardless of the choice of the first main face and by example for a sheet blank positioned horizontally, from bottom to top or from top to bottom.
  • the blank holder clamps the sheet blank 1 on the die 4 and the punch 2 comes into contact with the sheet blank 1.
  • the stroke of the punch 2 is controlled in order to achieve only one indentation 9 on the sheet blank, that is to say to deform the sheet blank 1 without cut it out.
  • the depth p of the indentation 9 is between 0.416 (1 - e -1.279E ) - 0.05E and 0.416 (1 - e -1.279E ) + 0.1E E being the thickness of the sheet blank 1.
  • Indentation 9 performed prior to the cutting operation allows local modification of the mechanical characteristics of the metal constituting the sheet blank to improve its final cutting.
  • This embodiment allows, when the indentation step and the cutting step are carried out on two different devices, to keep a cutting rate identical to the process rate of the state of the technique in which the cutting is carried out in a single step.
  • the same can be used punch 2 to carry out the indentation operation of the sheet blank 1 and the operation for cutting the sheet blank 1 after indentation.
  • This embodiment allows cutting according to the method of the invention without the need to invest in a cutting device more complex.
  • the sheet blank 1 is pressed against the die 4.
  • the punch 2 moves.
  • the sheet blank 1 can be pressed against the punch 2 and, in this case, the die 4 moves.
  • Type A steel is an electric steel, the sheet having undergone a final annealing. This sheet is covered with a coating of the type consisting of a or several organic resins comprising an inorganic polymer (varnish class C5 according to the classification ASTM A 345), of thickness between 1 and 2 microns.
  • Type B steel is a steel that has a limit bearing elastic equal to 2.2% and the sheet has also undergone a final annealing.
  • Steel C is also coated with a class C5 vomit.
  • the table below gives the experimental results obtained as a function of the depth p of the indentation 9.
  • the tests were carried out on a device whose punch 2 is made of carbide, of diameter equal to 12 mm, and the matrix 4, also in carbide, with a diameter equal to 12.05 mm, or a clearance j between the punch 2 and the die 4 equal to 0.05 mm.
  • This value p is a function of the thickness E of the sheet blank to be cut must preferably be between: 0.416 (1 - e -1.279E ) - 0.05E and 0.416 (1 - e -1.279E ) + 0.1E (see hatched area in Figure 3).
  • the cutting edge When cutting a sheet blank 1 using of a device comprising a punch and a cutting edge matrix, the cutting edge has two zones: a first sheared zone 10 located on the punch side, and a second broken zone 11 located on the die side.
  • the sheared area 10 When cutting with a clearance j between the punch and the weak matrix, of the order of 0.05 mm for an average diameter of the punch equal to 50 mm, without prior indentation, the sheared area 10 is large, having a height H of the order of 70% of the thickness of the sheet blank, and the broken zone 11 is small, of the order of 30% of the thickness sheet metal blank.
  • This broken zone 11 has a general profile which is substantially straight and in the extension of the sheared zone 10 (see FIG. 4a).
  • the sheared zone 10 is less important, having a height H generally less than 50% of the thickness of the sheet blank, and the broken area 11 is larger, generally greater than 50% of the thickness of the sheet blank.
  • sheared zone 10 has a large bulge 12 at level of its connection with the main face of the sheet metal blank, and the area ruptured 11 is oblique (see Figure 4b).
  • the cutting method according to the invention gives results whatever the type of steel used, whether the sheet metal blank is bare (case of steels B, D, E and F) or coated (case of steels A and C).
  • This cutting process is particularly interesting in the case of so-called magnetic steels, because the use of this process allows, equal mechanical characteristics of the steel, making the cut with a clearance j between the punch and the lower die, which allows less degrade the magnetic properties of the sheet blank.
  • the process according to the invention is also particularly well suited for making a piece with a welded insert.
  • the two sheet blanks are sheared at the sharp edges of the tool, i.e. at the sharp edges of the die and cutting punch.
  • the deformation is more like stamping than shearing.
  • the insert 15 is produced from a sheet blank thicker than the sheet metal blank in which the receiving orifice 16 is formed of this insert.
  • the insert 15 risks therefore to detach from the sheet blank 17, before being able to perform the welding.
  • the stroke of the cutting punch is determined so that the upper surface of insert 15 is in the same plane as the surface upper of the sheet blank 17 intended to receive it.
  • the insert 15 is not cut from the rest of the sheet blank 18.
  • the insert is thinner than the sheet blank intended to receive it, it is the portion of the thickest sheet blank, located below of the insert which is not cut.
  • the upper face of the insert 15 is located below of the upper face of the sheet blank 17, as shown in FIG. 7.
  • the diameter D of the insert minus the diameter d orifice is greater than 0.
  • the first test consisted in cutting the insert separately from a first sheet blank and the orifice in a second sheet blank, but with the same tool.
  • the Applicant has found that systematically the diameter d of the hole minus the diameter D of the insert is less than 0 which means that the insert is larger than the orifice which must receive it.
  • the second test consisted in cutting the insert into a first sheet blank and the hole in a second sheet blank with different tools.
  • the diameter D of the mechanically cut insert fluctuates around 0.08mm depending on the metal thickness dispersion, the state of wear of the cutting punch, the dispersion of the mechanical characteristics of the metal or the phenomena ovalization.
  • the diameter of the orifice mechanically cut fluctuates by about 0.12mm.
  • the diameter d of the orifice minus the diameter D of the insert varies between 0 and 0.2mm.
  • the method according to the invention solves this problem.
  • the device shown in Figures 8 and 9 for setting work of the method according to the invention comprises, as for the previous ones embodiments, two parts with sharp edges, movable one towards each other which are formed, on the one hand, by a punch 2 whose movement is slaved to that of a movable slide 3 and of shape corresponding to the perimeter to be cut and, on the other hand, by a matrix 4 linked to a fixed table 5 and of form combined with said punch 2 to obtain the desired cut.
  • the device also includes a blank holder 6 for pressing the sheet blanks on the matrix 4, as will be seen later.
  • the punch 2 and the die 4 each have a stop sharp, respectively 7 and 8, intended to cooperate with each other in time of lowering of the punch 2.
  • the method according to the invention consists, first of all, in carrying out an indentation 20a on a first sheet blank 20 with a depth p1 determined, then carry out an indentation 21a on a second sheet blank 21 of a determined depth p2.
  • the two blanks of sheet 20 and 21 are positioned one on top of the other, overlapping the indentations 20a and 21b and by placing said sheet blanks 20 and 21 on the matrix 4.
  • each indentation 20a and 21a on each blank of sheet 20 and 21 is between 0.075E and 0.90E, E being the thickness of the blank corresponding sheet metal.
  • the blank holder 6 presses the sheet blanks 20 and 21 on the die 4 and the punch 2 comes into contact with the upper face of the indentation 20a, as shown in figure 8.
  • the stroke of the punch 2 is stopped when the portion 23 cut from the sheet blank 20 in contact with said punch 2 is adjusted in the orifice 24 formed in the sheet blank 21 in contact with the matrix 4.
  • cutting is carried out in a single operation simultaneous of the two sheet blanks 20 and 21 and the positioning of the insert 23 in the orifice 24 formed in the sheet blank 21.
  • This tool includes for example a punch for cutting 50.02mm in diameter and a matrix of 50.05mm in diameter.
  • the contact between the insert and the orifice is therefore better and the penetration of the cutting punch necessary at cutting is lower.
  • the metal grains at the cut are all deformed in the same direction because the cutting is carried out in the same direction than that of indentation.
  • the wear of the tools is Slower.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Punching Or Piercing (AREA)
  • Shearing Machines (AREA)
  • Surgical Instruments (AREA)
  • Perforating, Stamping-Out Or Severing By Means Other Than Cutting (AREA)

Claims (7)

  1. Verfahren zum Ausschneiden eines Teils aus einer Blechplatte (1) mit Hilfe von zwei Bauteilen, die aufeinander zu bewegt werden können und die Schneidkanten, einen Preßstempel (2) und eine Matrize (4) aufweisen, dadurch gekennzeichnet, daß
    eine Vertiefung (9) einer bestimmten Tiefe p mit Hilfe eines Drückstempels in bestimmter Richtung und bestimmtem Sinn erzeugt wird,
    das Ausschneiden des Teils aus dem Blech (1) mit Hilfe eines Stanzstempels gemäß Richtung und Sinn der Vertiefung (9) durchgeführt wird.
  2. Verfahren zum Ausschneiden eines Teils aus einer Blechplatte (1) mit Hilfe von zwei Bauteilen, die aufeinander zu bewegt werden können und die Schneidkanten, einen Preßstempel (2) und eine Matrize (4) aufweisen, dadurch gekennzeichnet, daß
    eine Vertiefung (9) einer bestimmten Tiefe p mit Hilfe des Preßstempels (2) in bestimmter Richtung und bestimmtem Sinn hergestellt wird,
    der Preßstempel (2) wieder nach oben bewegt wird
    das Ausschneiden des Teils aus der Blechplatte (1) mit Hilfe des Preßstempels (2) gemäß Richtung und Sinn der Vertiefung (9) erfolgt.
  3. Verfahren gemäß den Ansprüchen 1 oder 2, dadurch gekennzeichnet, daß die Tiefe p der Vertiefung zwischen 0,416 (1-e-1,279E)-0,05E und 0,416 (1-e-1,279E)+0,1E beträgt, wobei E die Dicke der Blechplatte (1) ist.
  4. Verfahren gemäß den Ansprüchen 1 oder 2, dadurch gekennzeichnet, daß
    die Vertiefung (20a) in einer ersten Blechplatte (20) mit einer bestimnmten Tiefe p1 erzeugt wird,
    die Vertiefung (21a) in einer zweiten Blechplatte (21) mit einer bestimmten Tiefe p2 erzeugt wird,
    die Blechplatten (20, 21) aufeinander gelegt werden, indem die Vertiefungen (20a, 21a) übereinander gelegt werden,
    die beiden Blechplatten (20, 21) mit Hilfe des Stanzstempels (2) gleichzeitig ausgeschnitten werden.
  5. Verfahren gemäß Anspruch 4, dadurch gekennzeichnet, daß man die Bewegung des Stanzstempels (2) in dem Moment stoppt, in dem der in Kontakt mit dem Preßstempel (2) ausgeschnittene Abschnitt (23) der Blechplatte (20) in das Loch (24) eingepaßt ist, welches sich in der Blechplatte (21) beim Kontakt mit der Matrize (4) bildet.
  6. Verfahren gemäß Anspruch 4, dadurch gekennzeichnet, daß die Tiefe der Vertiefung (20a, 21a) in jeder Blechplatte (20, 21) zwischen 0,75E und 0,90 E beträgt, wobei E die Dicke der entsprechenden Blechplatte (20, 21) ist.
  7. Verwendung des Verfahrens gemäß einem der Ansprüche 4 bis 6 zur Herstellung eines geschweißten Einsatzes durch gleichzeitiges Ausschneiden von zwei übereinander gelegten Blechplatten (20, 21).
EP19970401592 1996-07-25 1997-07-03 Verfahren zum Ausschneiden eines Zuschnittteils aus einer Blechplatte Expired - Lifetime EP0820821B1 (de)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
FR9609358 1996-07-25
FR9609358A FR2751570B1 (fr) 1996-07-25 1996-07-25 Procede de decoupage d'une piece dans un flan de tole
FR9703625 1997-03-25
FR9703625A FR2751571B1 (fr) 1996-07-25 1997-03-25 Procede de decoupage d'une piece dans un flan de tole

Publications (2)

Publication Number Publication Date
EP0820821A1 EP0820821A1 (de) 1998-01-28
EP0820821B1 true EP0820821B1 (de) 2001-12-05

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Application Number Title Priority Date Filing Date
EP19970401592 Expired - Lifetime EP0820821B1 (de) 1996-07-25 1997-07-03 Verfahren zum Ausschneiden eines Zuschnittteils aus einer Blechplatte

Country Status (5)

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EP (1) EP0820821B1 (de)
JP (1) JPH1085860A (de)
DE (1) DE69708777T2 (de)
ES (1) ES2171855T3 (de)
FR (1) FR2751571B1 (de)

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6258023B1 (en) 1999-07-08 2001-07-10 Chase Medical, Inc. Device and method for isolating a surface of a beating heart during surgery
CZ296864B6 (cs) * 2001-10-29 2006-07-12 Brano A. S. Postup vytvárení presné strizné plochy pri postupovém tvárení za studena a zarízení k provádení tohoto postupu
CN102310136B (zh) * 2011-09-28 2013-07-24 苏州三维精密机械有限公司 部件圆弧部位冲裁新工艺
KR101665797B1 (ko) * 2014-12-23 2016-10-13 주식회사 포스코 프레스 성형 방법 및 장치
EP3097988A1 (de) * 2015-05-27 2016-11-30 GEA Scan-Vibro A/S Vibrationsvorrichtung und verfahren zur verbesserung der haltbarkeit einer vibrationsvorrichtung
JP6315287B2 (ja) * 2015-10-02 2018-04-25 エコー電気株式会社 液体検査用具の製造方法
CN115846367B (zh) * 2022-12-20 2024-09-17 张家港华仁再生资源有限公司 一种废旧汽车金属回收系统及回收方法

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Publication number Priority date Publication date Assignee Title
GB923811A (en) * 1958-05-07 1963-04-18 Production Engineering Res Ass Improvements in and relating to the punching of sheet or strip materials
US3611854A (en) * 1969-10-30 1971-10-12 Vitaly Konstantinovich Gilev Compound die for punching two concentrically shaped sheet circular members from strap material in punch presses with vertical disposition of blanking planes
US3739669A (en) * 1970-05-29 1973-06-19 Suzuki Motor Co Shearing press of opposing die type
IT972789B (it) * 1972-12-22 1974-05-31 Ibm Spa Procedimento e dispositivi di tranciatura senza bave
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
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
DE3931320C1 (de) * 1989-09-20 1991-08-08 Feintool International Holding, Lyss, Ch
DE4207165A1 (de) * 1992-03-06 1993-09-09 Fuji Electric Co Ltd Verfahren zum stanzen einer metallfolie auf einer mit piezoelektrischen betaetigern betriebenen presse und stanzwerkzeugsaetze fuer die ausfuehrung des verfahrens

Also Published As

Publication number Publication date
ES2171855T3 (es) 2002-09-16
FR2751571A1 (fr) 1998-01-30
DE69708777T2 (de) 2002-08-29
FR2751571B1 (fr) 1999-10-22
DE69708777D1 (de) 2002-01-17
JPH1085860A (ja) 1998-04-07
EP0820821A1 (de) 1998-01-28

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