EP3178580B1 - Outil progressive pour localiser et contrôler l'étirage d'une tôle pendant le formage d'une plaque de freins - Google Patents

Outil progressive pour localiser et contrôler l'étirage d'une tôle pendant le formage d'une plaque de freins Download PDF

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Publication number
EP3178580B1
EP3178580B1 EP16202736.1A EP16202736A EP3178580B1 EP 3178580 B1 EP3178580 B1 EP 3178580B1 EP 16202736 A EP16202736 A EP 16202736A EP 3178580 B1 EP3178580 B1 EP 3178580B1
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EP
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Prior art keywords
punches
punch
progressive die
peripheral
die
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EP16202736.1A
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German (de)
English (en)
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EP3178580A1 (fr
Inventor
Elio Bora
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Bora SpA
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Bora Srl
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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
    • B21D11/00—Bending not restricted to forms of material mentioned in only one of groups B21D5/00, B21D7/00, B21D9/00; Bending not provided for in groups B21D5/00 - B21D9/00; Twisting
    • B21D11/02—Bending by stretching or pulling over a die
    • 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
    • B21D22/00—Shaping without cutting, by stamping, spinning, or deep-drawing
    • B21D22/20—Deep-drawing
    • B21D22/22—Deep-drawing with devices for holding the edge of the blanks
    • 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
    • B21D25/00—Working sheet metal of limited length by stretching, e.g. for straightening
    • B21D25/02—Working sheet metal of limited length by stretching, e.g. for straightening by pulling over a die
    • 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
    • B21D53/34—Making other particular articles wheels or the like brake drums

Definitions

  • the present patent application relates to a progressive die, in particular to a stretching die, for making a brake plate.
  • Brake plates are characterized by relatively flat areas, which are quite easy to form, and high-deformation critical areas.
  • Fig. 1 shows a brake plate (P).
  • the critical areas of the brake plate (P) are:
  • These areas (A, B, C) of the brake plate (P) have strict dimensional and geometrical tolerances in order to ensure a correct mounting of the brake plate (P) in the braking system and ensure a minimum thickness to guarantee fatigue strength of the brake plate.
  • the forming method of brake plates provides for the following operations: shearing of a sheet steel; stretching of the sheet steel; deep drawing; adjustment; vertical drilling; drilling of fairlead holes by means of cams; edge trimming and part detachment.
  • the stretching operation is made with a die provided with a single punch with substantially hemispheric shape. In this way a practically uniform stretching is obtained on the sheet steel.
  • Fig. 2 shows a stretching die according to the prior art, indicated with reference numeral (200).
  • the stretching die (200) comprises an upper base (201) connected to a ram of the press and a lower base, not shown.
  • An upper sheet-presser (13) is fastened to the upper base (201).
  • the upper sheet-presser has a central hole (13a).
  • a lower sheet-presser (14) is movably mounted on the lower base.
  • a punch (15) passing through the lower sheet-presser (14) is fastened on the lower base.
  • the punch (15) has a substantially hemispheric head and engages in the central hole (13a) of the upper sheet-presser to stretch the sheet steel.
  • two punches (15) are generally provided in order to work two brake plates.
  • Fig. 2 shows the die in closed position (with the ram of the press in the lower dead center position).
  • Fig. 2A shows the sheet steel coming out of the stretching die (200).
  • the sheet steel is curved with a small radius of curvature that corresponds to the radius of curvature of the head of the punch.
  • a uniform stretching of the material of the sheet steel (L) is obtained with such a die.
  • the uniform stretching requires the material to flow from one area to the other area of the brake plate during the subsequent deep drawing operation.
  • the small radiuses of the punches used for deep drawing do not allow the sheet steel to flow from one area to the other area during deep drawing, thus generating localized defects, such as for example folding caused by excess material or excessive stretching caused by lack of material.
  • difficulties are encountered in complying with the tolerance values required by the technical drawing of the brake plate.
  • the punch creates problems when setting up the die. To correct the defects found on the sheet steel, it is necessary to rework the entire surface of the punch, and not only the areas where defects are found. Even using computerized simulation methods and graphic measurements of the deformation of the sheet steel, numerous attempts must be made with multiple reworking operations of the almost hemispheric punch before an ideal solution is found for the optimal operation of the die.
  • US2689539 discloses a die for stretching a sheet steel comprising a plurality of punches mounted on a lower base and one punch mounted on an upper base of the die.
  • the purpose of the present invention is to eliminate the drawbacks of the prior art by disclosing a die, which can be part of a progressive forming system, able to stretch the sheet steel locally, or make the sheet steel slide to obtain a semi-finished part that is suitable for being worked in the subsequent stations in an effective, versatile and practical way.
  • a progressive die according to the present invention has been studied, which allows to localize and control the stretching of the sheet steel during forming of a brake plate.
  • a transfer press or progressive press for making a brake plate is diagrammatically shown.
  • Said transfer press comprises seven working stations: a shearing station (S1); a stretching station (S2); a deep drawing station (S3); an adjustment station (S4); a vertical drilling station (S5); a cam drilling station (S6); an edge trimming and part detachment station (S7).
  • a sheet steel is fed in the transfer press and suitably worked parts (P1, P2, P3, P4, P5, P6, P7) come out of each station (S1-S7).
  • Figs. 7 - 9 show the stretching die of the invention, which is generally indicated with reference numeral (100).
  • the die (100) comprises an upper base (101) connected to a ram of the press and a lower base, not shown.
  • An upper sheet-presser (10) is fastened to the upper base (101).
  • the upper sheet-presser has a central hole (10a).
  • An upper punch (11) is fastened to the upper base and disposed in the central hole (10a) of the upper sheet-presser.
  • the upper punch (11) has a substantially flat head with a curved edge.
  • the diameter of the upper punch (11) is lower than the diameter of the central hole (10a) in a way to leave an annular space (10b).
  • a lower sheet-presser (9) is mounted on the lower base with possibility of moving vertically.
  • the lower sheet-presser (9) is shaped as a plate.
  • Grooves (12) are provided on the lower sheet-presser (9), where draw bead rods fastened to the upper base (101) operate.
  • a central punch (2) is fastened to the lower base and passes through the lower sheet-presser (9), in a way to be easily adjusted in height with shims or spacers not shown in the figure.
  • the central punch (2) is shaped as a disc with rounded upper edges and a substantially flat head.
  • the central punch (2) is disposed in correspondence of the central hole (10a) of the upper sheet-presser (10).
  • the central punch (2) protrudes in upper position with respect to the lower sheet-presser (9).
  • Two peripheral punches (3, 4) are disposed in diametrally opposite position above the central punch (2) in a way to enter the annular space (10b) of the upper sheet-presser.
  • the peripheral punches (3, 4) are fastened to the lower base with supports that pass through the central punch (2). In this way the peripheral punches (3, 4) can be easily adjusted in height with shims not shown in the figure.
  • the adjustment of the peripheral punches (3, 4) is independent of the adjustment of the central punch (2).
  • Each peripheral punch (3, 4) has a substantially semi-cylindrical shape with axis parallel to the upper surface of the lower sheet-presser (9).
  • the peripheral punches are disposed in parallel position in diametrally opposite positions with respect to the center of the central punch (2).
  • the first peripheral punch (3) is higher than the second peripheral punch (4).
  • the peripheral punches (3, 4) are situated in correspondence of areas where reverse deep drawing will be made (for example in correspondence of area (B) of Fig. 1-3 ).
  • Lateral punches (5, 6, 7, 8) are fastened on the central punch (2) and disposed on the sides of the peripheral punches (3, 4) in such manner to enter the space (10b) of the upper sheet-presser.
  • the lateral punches (5, 6, 7, 8) are four lateral punches disposed in diametrally opposite positions with respect to the center of the central punch (2) and spaced by 90°.
  • Two lateral punches (7, 8) are disposed on the sides of the first peripheral punch (3) and other two lateral punches (5, 6) are disposed on the sides of the second peripheral punch (4).
  • Each lateral punch (5, 6, 7, 8) has a shape with hemispheric head.
  • the lateral punches (7, 8) beside the first peripheral punch (3) are higher than the lateral punches (5, 6) beside the second peripheral punch (4).
  • the lateral punches (5, 6, 7, 8) are positioned in the areas where the final shape is obtained with subsequent deep drawing operations (area A of Fig. 1-2 ).
  • the adjustment of the lateral punches (5, 6, 7, 8) is independent of the adjustment of the peripheral punches (4).
  • the adjustment of the lateral punches (5, 6, 7, 8) is made with shims or spacers, not shown in the figures.
  • the arrangement of the upper punch (11) and of the central punch (2) in the area that corresponds to the central area of the brake plate, and the arrangement of the peripheral punches (3, 4) and of the lateral punches (5, 6, 7, 8) in peripheral position with respect to the center of the brake plate allow for the sliding of the sheet steel from the central area of the brake plate towards the peripheral punches (3, 4) and the lateral punches (5, 6, 7, 8).
  • the die (100) comprises two central punches (2) to make two brake plates.
  • the sheet steel which is sheared in the first station (S1), is fed towards the die (100) of the second station (S2) that receives the sheet steel on the lower sheet-presser (9), with die open and lower sheet-presser (9) in high position.
  • the high position of the lower sheet-presser (9) allows the sheet steel to slide on the central punch (2), on the peripheral punches (3, 4) and on the lateral punches (5, 6, 7, 8).
  • the upper base (101) comes down and the sheet steel (L) is compressed between the upper sheet-presser (10) and the lower sheet-presser (9).
  • the lower sheet-presser (9) Under the thrust of the upper sheet-presser (10), the lower sheet-presser (9) is lowered.
  • the upper base (101) keeps coming down and the sheet steel (L), compressed between the two sheet-pressers (9, 10), is stretched on the punches (2-8).
  • the draw bead rods acting on the sheet steel in correspondence of the slots (12) of the lower sheet-presser brake the sliding of the sheet steel compressed between the upper sheet-presser (10) and the lower sheet-presser (9).
  • the upper punch (11) comes in contact with the sheet steel (L) and starts deep drawing the sheet steel in correspondence of the central part of the brake plate.
  • the upper punch (11) compresses the sheet steel on the central punch (2), then the upper base (101) rises towards the initial position.
  • Such a progressive die (100) allows to localize and control the stretching of the sheet steel during forming of a brake plate.
  • the novelty of the die (100) according to the present invention compared to the die of the prior art (200) consists in the replacement of the single central punch (15) with a plurality of punches (2, 3, 4, 5, 6, 7, 8) and in the addition of the upper punch (11).
  • the die (100) allows to stretch the sheet steel because the lower punches (2, 3, 4, 5, 6, 7, 8) and the upper punch (11) keep having a contact surface with the sheet steel with a large radius of curvature.
  • the upper punch (11) adds a deep drawing part (sliding of the sheet steel in the central part of the brake plate) to the stretching of the sheet steel.
  • the lower punches (2-8) can be individually adjusted in height.
  • the sections on the brake plate correspond to the section planes (I-I. II-II, III-III and IV-IV) of Fig.1 .
  • Figs. 6.1, 6A.1 and 6B.1 are sections of the disc along a section plane I-I of Fig. 1 .
  • Fig. 6.1 shows the result of forming with the die (200) of the prior art.
  • Fig. 6A.1 shows the result of forming with the die (100) of the invention.
  • Fig. 6B.1 shows the result of forming after deep drawing.
  • Figs. 6.2, 6A.2 and 6B.2 are sections of the disc along the section plane II-II of Fig. 1 .
  • Fig. 6.2 shows the result of forming with the die (200) of the prior art.
  • Fig. 6A.2 shows the result of forming with the die (100) of the invention.
  • Fig. 6B.2 shows the result of forming after deep drawing.
  • Figs. 6.3, 6A.3 and 6B.3 are sections of the disc along the section plane III-III of Fig. 1 .
  • Fig. 6.3 shows the result of forming with the die (200) of the prior art.
  • Fig. 6A.3 shows the result of forming with the die (100) of the invention.
  • Fig. 6B.3 shows the result of forming after deep drawing.
  • Figs. 6.4, 6A.4 and 6B.4 are sections of the disc along the section plane IV-IV of Fig. 1 .
  • Fig. 6.4 shows the result of forming with the die (200) of the prior art.
  • Fig. 6A.4 shows the result of forming with the die (100) of the invention.
  • Fig. 6B.4 shows the result of forming after deep drawing.
  • the computerized calculation shows that in the area (A) of Fig.1-2 , with the stretching made with the die (100) of the invention, after the deep drawing operation, the thickness of the material increases by 12% compared to the thickness of the material that would be measured in the same area if the deep drawing operation was preceded by a stretching operation made with the die (200) with almost hemispheric punch of the prior art.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Shaping Metal By Deep-Drawing, Or The Like (AREA)

Claims (15)

  1. Moule à pas progressif (100) qui permet de localiser et contrôler l'étirement de la tôle pendant le moulage d'un plateau de frein, ledit moule à pas progressif (100) comprenant :
    - un poinçon central (2) fixé sur une base inférieure du moule, de manière à pouvoir être réglé en hauteur à l'aide de cales ; et
    - des poinçons périphériques (3, 4) montés sur la base inférieure du moule de façon à pouvoir être réglés individuellement en hauteur à l'aide de cales ;
    caractérisé en ce qu'il comprend
    - des poinçons latéraux (5, 6, 7, 8) montés sur le poinçon central (2) de façon à pouvoir être individuellement réglés en hauteur à l'aide de cales, indépendamment du réglage des poinçons périphériques (3, 4).
  2. Moule à pas progressif (100) selon la revendication 1, où les poinçons périphériques (3, 4) sont disposés en position périphérique au-dessus du poinçon central (2).
  3. Moule à pas progressif (100) selon la revendication 1 ou 2, où le poinçon central (2) a la forme d'un disque avec une surface supérieure plate.
  4. Moule à pas progressif (100) selon la revendication 3, où les poinçons périphériques (3, 4) sont deux poinçons périphériques disposés sur des positions diamétralement opposées par rapport au centre du poinçon central (2).
  5. Moule à pas progressif (100) selon la revendication 4, où les poinçons périphériques (3, 4) comprennent un premier poinçon périphérique (3) qui est plus haut d'un second poinçon périphérique (4).
  6. Moule à pas progressif (100) selon l'une quelconque des revendications précédentes, où les poinçons périphériques (3, 4) ont essentiellement une forme demi-cylindrique.
  7. Moule à pas progressif (100) selon l'une quelconque des revendications précédentes, où les poinçons latéraux (5, 6, 7, 8) sont fixés de manière périphérique sur le poinçon central (2) et sont disposés latéralement par rapport aux poinçons périphériques (3, 4).
  8. Moule à pas progressif (100) selon l'une quelconque des revendications précédentes, où les poinçons latéraux (5, 6, 7, 8) ont une tête de forme hémisphérique.
  9. Moule à pas progressif (100) selon l'une quelconque des revendications précédentes, où les poinçons périphériques (5, 6, 7, 8) sont quatre poinçons latéraux disposés sur des positions diamétralement opposées par rapport au centre du poinçon central (2) et équidistants entre eux de 90°.
  10. Moule à pas progressif (100) selon la revendication 9, comprenant une première paire de poinçons latéraux (7, 8) qui est plus haute d'une seconde paire de poinçons latéraux (5, 6).
  11. Moule à pas progressif (100) selon l'une quelconque des revendications précédentes, comprenant un dispositif de pressage préliminaire inférieur (9) monté mobile verticalement sur ladite base inférieure, le poinçon central (2) traversant ledit dispositif de pressage préliminaire inférieur (9).
  12. Moule à pas progressif (100) selon l'une quelconque des revendications précédentes, comprenant :
    - une base supérieure (101) destinée à être fixée par un coulisseau d'une presse,
    - un dispositif de pressage préliminaire supérieur (10) fixé à la base supérieure (101) et ayant un orifice central (10a) et
    - un poinçon supérieur (11) fixé à ladite base supérieure, en correspondance du dit poinçon central (2), ledit poinçon supérieur (11) étant disposé dans l'orifice central (10a) de la base supérieure de façon à générer un espacement annulaire (10b) apte à accueillir lesdits poinçons périphériques (3, 4) et lesdits poinçons latéraux (5, 6, 7 8).
  13. Moule à pas progressif (100) selon la revendication 12, où la tête du dit poinçon supérieur (11) est plate.
  14. Moule à pas progressif (100) selon la revendication 12, comprenant des tiges de lissage fixées à la base supérieure (101) du moule et qui agissent sur la tôle (L) en correspondance de fissures (12) réalisées dans le dispositif de pressage préliminaire inférieur (9).
  15. Moule à pas progressif (100) selon l'une quelconque des revendications précédentes, comprenant deux poinçons centraux (2) pour réaliser deux plateaux de frein.
EP16202736.1A 2015-12-11 2016-12-07 Outil progressive pour localiser et contrôler l'étirage d'une tôle pendant le formage d'une plaque de freins Active EP3178580B1 (fr)

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Application Number Priority Date Filing Date Title
ITUB20159824 2015-12-11

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EP3178580A1 EP3178580A1 (fr) 2017-06-14
EP3178580B1 true EP3178580B1 (fr) 2020-11-11

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IT (1) IT201600124471A1 (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113145763B (zh) * 2021-04-02 2023-03-10 东莞市钮纽实业有限公司 一种用于生产金属件的高速冲压模具
CN114178408B (zh) * 2021-11-22 2022-09-20 成都飞机工业（集团）有限责任公司 一种级进式拉深模具的操作方法

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2689539A (en) 1949-02-05 1954-09-21 Lyon George Albert Apparatus for making wheel covers
US5600991A (en) * 1995-02-10 1997-02-11 Ogihara America Corporation Stretch controlled forming mechanism and method for forming multiple gauge welded blanks

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EP3178580A1 (fr) 2017-06-14

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