EP0820821A1 - Procédé de découpage d'une pièce dans un flan de tÔle - Google Patents
Procédé de découpage d'une pièce dans un flan de tÔle Download PDFInfo
- Publication number
- EP0820821A1 EP0820821A1 EP97401592A EP97401592A EP0820821A1 EP 0820821 A1 EP0820821 A1 EP 0820821A1 EP 97401592 A EP97401592 A EP 97401592A EP 97401592 A EP97401592 A EP 97401592A EP 0820821 A1 EP0820821 A1 EP 0820821A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- cutting
- indentation
- sheet
- punch
- 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.)
- Granted
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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
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- 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 to cut the piece and 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 metal blank by means of two organs movable towards each other and having sharp edges, a punch and a matrix, characterized in that it consists in carrying out an indentation of a depth p determined in a defined direction and direction, and at cut said piece from said sheet blank in the direction and the sense of formation of the indentation.
- 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 1a 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.
- 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 shaded 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.
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Punching Or Piercing (AREA)
- Perforating, Stamping-Out Or Severing By Means Other Than Cutting (AREA)
- Surgical Instruments (AREA)
- Shearing Machines (AREA)
Abstract
Description
- le procédé consiste à réaliser une indentation d'une profondeur p déterminée au moyen d'un poinçon d'indentation selon une direction et un sens définis, et à réaliser la découpe de la pièce dans le flan de tôle au moyen d'un poinçon de découpe selon la direction et le sens de formation de l'indentation ;
- le procédé consiste à réaliser une indentation d'une profondeur p déterminée au moyen du poinçon selon une direction et un sens définis, à relever ledit poinçon, et à réaliser la découpe de la pièce dans la tôle au moyen dudit poinçon selon la direction et le sens de formation de l'indentation;
- le procédé consiste à réaliser l'indentation sur un premier flan de tôle d'une profondeur p1 déterminée, à réaliser l'indentation sur un second flan de tôle d'une profondeur p2 déterminée, à positionner l'un sur l'autre les flans de tôle en superposant les indentations, et à découper simultanément les deux flans de tôle au moyen dudit poinçon de découpe,
- on arrête la course du poinçon de découpe au moment où la portion découpée dans le flan de tôle en contact avec ledit poinçon est ajustée dans l'orifice formé dans le flan de tôle en contact avec la matrice,
- la figure 1 est une vue schématique en élévation d'un dispositif de découpage pour la mise en oeuvre du procédé de l'invention,
- la figure 2 est une vue schématique montrant la phase de réalisation de l'indentation sur le flan de tôle,
- la figure 3 représente une courbe montrant le domaine de profondeur de l'indentation en fonction de l'épaisseur du flan de tôle à découper,
- les figures 4a à 4c sont des vues schématiques du bord de découpe de la tôle selon les procédés de découpage utilisés,
- les figures 5 à 7 sont des demi-vues en coupe du profil de découpe d'une pièce à insert réalisée par un procédé selon l'état de la technique,
- les figures 8 et 9 sont des vues en élévation d'un dispositif pour la mise en oeuvre du procédé de l'invention et la réalisation d'une pièce avec un insert,
- les figures 10 et 11 sont des vues schématiques du bord de découpe de la tôle montrant l'orientation des grains du métal avec respectivement le procédé selon l'invention et le procédé selon l'état de la technique.
- à plaquer le flan de tôle 1 contre la matrice 4,
- à réaliser une indentation 9 d'une profondeur p déterminée selon une direction et un sens définis,
- et à réaliser la découpe de ladite pièce dans ledit flan de tôle 1 selon la direction et le sens de formation de l'indentation 9.
0,416(1 - e-1,279E) - 0,05E et 0,416(1 - e-1,279E) + 0,1E E étant l'épaisseur du flan de tôle 1.
- à plaquer le flan de tôle 1 contre la matrice 4,
- à réaliser une indentation 9 d'une profondeur p déterminée au moyen d'un poinçon d'indentation selon une direction et un sens définis,
- à réaliser la découpe de la pièce dans la tôle 1 au moyen d'un poinçon de découpe selon la direction et le sens de formation de l'indentation 9.
- à plaquer le flan de tôle 1 contre la matrice 4,
- à réaliser une indentation 9 d'une profondeur p déterminée au moyen du poinçon 2 selon une direction et un sens définis,
- à relever ledit poinçon 2,
- à réaliser la découpe de la pièce dans la tôle 1 au moyen dudit poinçon 2 selon la direction et le sens de formation de l'indentation 9.
Acier | C | N | Si | Al | Mn | P | Ni | Cr | S | Re (MPa) | Rm (MPa) | Re/Rm | A% |
A | 0,004 | 0,004 | 2,9 | 0,38 | 0,19 | - | - | - | - | 387 | 535 | 0,72 | 25 |
B | 0,003 | 0,005 | 1,26 | 0,094 | 0,283 | 0,05 | - | - | 0,003 | 295 | 426 | 0,68 | 36 |
C | 0,002 | - | 0,345 | - | 0,407 | 0,175 | - | - | 0,005 | 321 | 436 | 0,73 | 35 |
D | 0,002 | - | 1,34 | - | 1,275 | 0,013 | - | - | 0,003 | 299 | 432 | 0,69 | 35 |
E | 0,004 | - | 0,321 | 0,002 | 0,372 | 0,170 | - | - | 0,007 | 255 | 397 | 0,64 | 37 |
F | 0,029 | 0,006 | 0,007 | 0,057 | 0,177 | 0,005 | 0,015 | 0,032 | - | 295 | 351 | 0,84 | 31 |
Type d'acier | Epaisseur E de la tôle | Profondeur p de l'indentation en mm | Energie dissipée en kJ/mm |
A | 0,2 | 0 | 158 |
A | 0,2 | 0,10 | 96 |
A | 0,35 | 0 | 1215 |
A | 0,35 | 0,15 | 875 |
B | 0,5 | 0 | 2451 |
B | 0,5 | 0,20 | 1928 |
C | 0,65 | 0 | 3647 |
C | 0,65 | 0,10 | 2772 |
C | 0,65 | 0,20 | 2898 |
C | 0,65 | 0,30 | 2182 |
C | 0,65 | 0,40 | 3336 |
D | 0,65 | 0 | 3161 |
D | 0,65 | 0,25 | 2518 |
E | 1,00 | 0 | 5134 |
E | 1,00 | 0,20 | 5170 |
E | 1,00 | 0,30 | 3728 |
E | 1,00 | 0,35 | 3415 |
E | 1,00 | 0,40 | 2807 |
F | 1,00 | 0 | 5035 |
F | 1,00 | 0,30 | 4609 |
Type d'acier | Epaisseur E de la tôle | Profondeur p de l'indentation en mm | Hauteur cisaillée en mm | Energie dissipée en kJ/mm |
C | 0,65 | 0 | 0,55 | 904 |
C | 0,65 | 0,10 | 0,53 | 709 |
C | 0,65 | 0,20 | 0,47 | 635 |
C | 0,65 | 0,25 | 0,41 | - |
C | 0,65 | 0,35 | 0,35 | - |
C | 0,65 | 0,30 | - | 712 |
C | 0,65 | 0,40 | - | 696 |
E | 1 | 0 | 0,88 | 1496 |
E | 1 | 0,20 | 0,84 | 1231 |
E | 1 | 0,25 | 0,8 | - |
E | 1 | 0,30 | 0,79 | 1231 |
E | 1 | 0,35 | - | 1207 |
E | 1 | 0,4 | - | 1368 |
0,416(1 - e-1,279E) - 0,05E et 0,416(1 - e-1,279E) + 0,1E (voir domaine hachuré sur la figure 3).
Claims (8)
- Procédé de découpage d'une pièce dans un flan de tôle (1) au moyen de deux organes déplaçables l'un vers l'autre et comportant des arêtes tranchantes, un poinçon (2) et une matrice (4), caractérisé en ce qu'il consiste :à réaliser une indentation (9) d'une profondeur p déterminée, selon une direction et un sens définis,et à réaliser la découpe de ladite pièce dans ledit flan de tôle (1) selon la direction et le sens de formation de l'indentation (9),
- Procédé selon la revendication 1, caractérisé en ce qu'il consiste :à réaliser une indentation (9) d'une profondeur p déterminée au moyen d'un poinçon d'indentation, selon une direction et un sens définis,à réaliser la découpe de la pièce dans la tôle (1) au moyen d'un poinçon de découpe selon la direction et le sens de formation de l'indentation (9),
- Procédé selon la revendication 1, caractérisé en ce qu'il consiste :à réaliser une indentation (9) d'une profondeur p déterminée au moyen du poinçon (2), selon une direction et un sens définis,à relever ledit poinçon (2),à réaliser la découpe de la pièce dans le flan de tôle (1) au moyen dudit poinçon (2) selon la direction et le sens de formation de l'indentation (9).
- Procédé selon l'une des revendications 1 à 3, caractérisé en ce que la profondeur p de l'indentation est comprise entre
0,416(1 - e-1,279E) - 0,05E et 0,416(1 - e-1,279E) + 0,1E E étant l'épaisseur du flan de tôle (1). - Procédé selon l'une des revendications 1 à 3, caractérisé en ce qu'il consiste :à réaliser l'indentation (20a) sur un premier flan de tôle (20) d'une profondeur p1 déterminée,à réaliser l'indentation (21a) sur un second flan de tôle (21) d'une profondeur p2 déterminée,à positionner l'un sur l'autre les flans de tôle (20, 21) en superposant les indentations (20a, 21a),et à découper simultanément les deux flans de tôle (20, 21) au moyen dudit poinçon de découpe (2).
- Procédé selon la revendication 5, caractérisé en ce que l'on arête la course du poinçon de découpe (2) au moment où la portion (23) découpée dans le flan de tôle (20) en contact avec ledit poinçon (2) est ajustée dans l'orifice (24) formé dans le flan de tôle (21) en contact avec la matrice (4).
- Procédé selon la revendication 5, caractérisé en ce que la profondeur de l'indentation (20a, 21a) sur chaque flan de tôle (20, 21) est comprise entre 0,75 E et 0,90E, E étant l'épaisseur du flan de tôle (20, 21) correspondant.
- Utilisation du procédé selon l'une des revendications 5 à 7 pour la réalisation d'une pièce à insert soudé par découpage simultané de deux flans de tôle (20, 21) superposés.
Applications Claiming Priority (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR9609358A FR2751570B1 (fr) | 1996-07-25 | 1996-07-25 | Procede de decoupage d'une piece dans un flan de tole |
FR9703625A FR2751571B1 (fr) | 1996-07-25 | 1997-03-25 | Procede de decoupage d'une piece dans un flan de tole |
FR9609358 | 1997-03-25 | ||
FR9703625 | 1997-03-25 |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0820821A1 true EP0820821A1 (fr) | 1998-01-28 |
EP0820821B1 EP0820821B1 (fr) | 2001-12-05 |
Family
ID=26232869
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP19970401592 Expired - Lifetime EP0820821B1 (fr) | 1996-07-25 | 1997-07-03 | Procédé de découpage d'une pièce dans un flan de tôle |
Country Status (5)
Country | Link |
---|---|
EP (1) | EP0820821B1 (fr) |
JP (1) | JPH1085860A (fr) |
DE (1) | DE69708777T2 (fr) |
ES (1) | ES2171855T3 (fr) |
FR (1) | FR2751571B1 (fr) |
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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 |
EP0418779A1 (fr) * | 1989-09-20 | 1991-03-27 | Feintool International Holding | Méthode pour manufacture de pièces d'oeuvre par découpage, en particulier dans un outil à contre découpage à précision |
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 |
-
1997
- 1997-03-25 FR FR9703625A patent/FR2751571B1/fr not_active Expired - Fee Related
- 1997-07-03 ES ES97401592T patent/ES2171855T3/es not_active Expired - Lifetime
- 1997-07-03 DE DE1997608777 patent/DE69708777T2/de not_active Expired - Fee Related
- 1997-07-03 EP EP19970401592 patent/EP0820821B1/fr not_active Expired - Lifetime
- 1997-07-25 JP JP19950197A patent/JPH1085860A/ja active Pending
Patent Citations (8)
Publication number | Priority date | Publication date | Assignee | Title |
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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 |
FR2096767A1 (fr) * | 1970-05-29 | 1972-02-25 | Suzuki Motor Co | |
FR2211300A1 (fr) * | 1972-12-22 | 1974-07-19 | Ibm | |
DE2727445B1 (de) * | 1977-06-18 | 1979-01-04 | Lange Kurt Prof Dr Ing | Verfahren und Vorrichtung zum Ausschneiden und/oder Lochen von Werkstuecken 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 |
EP0418779A1 (fr) * | 1989-09-20 | 1991-03-27 | Feintool International Holding | Méthode pour manufacture de pièces d'oeuvre par découpage, en particulier dans un outil à contre découpage à précision |
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 |
Cited By (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6740029B2 (en) | 1999-07-08 | 2004-05-25 | Chase Medical, L.P. | 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 |
EP3097988A1 (fr) * | 2015-05-27 | 2016-11-30 | GEA Scan-Vibro A/S | Appareil vibrant et procédé permettant d'améliorer la durabilité d'un tel appareil |
WO2016189110A1 (fr) * | 2015-05-27 | 2016-12-01 | GEA Scan-Vibro A/S | Appareil vibrant et procédé d'amélioration de la durabilité d'un appareil vibrant |
CN107820450A (zh) * | 2015-05-27 | 2018-03-20 | 基伊埃斯坎维布罗公司 | 振动设备和用于提高振动设备的耐用性的方法 |
JP2017064893A (ja) * | 2015-10-02 | 2017-04-06 | エコー電気株式会社 | 液体検査用具の製造方法 |
CN115846367A (zh) * | 2022-12-20 | 2023-03-28 | 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 |
Also Published As
Publication number | Publication date |
---|---|
FR2751571B1 (fr) | 1999-10-22 |
EP0820821B1 (fr) | 2001-12-05 |
ES2171855T3 (es) | 2002-09-16 |
JPH1085860A (ja) | 1998-04-07 |
DE69708777D1 (de) | 2002-01-17 |
FR2751571A1 (fr) | 1998-01-30 |
DE69708777T2 (de) | 2002-08-29 |
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