EP0367642A1 - Method and device for shaping sheet metal, particularly for realizing a shadow mask for cathode ray tubes obtained according to the method - Google Patents

Method and device for shaping sheet metal, particularly for realizing a shadow mask for cathode ray tubes obtained according to the method Download PDF

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Publication number
EP0367642A1
EP0367642A1 EP89402656A EP89402656A EP0367642A1 EP 0367642 A1 EP0367642 A1 EP 0367642A1 EP 89402656 A EP89402656 A EP 89402656A EP 89402656 A EP89402656 A EP 89402656A EP 0367642 A1 EP0367642 A1 EP 0367642A1
Authority
EP
European Patent Office
Prior art keywords
clamping member
sheet blank
punch
peripheral
cams
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
Application number
EP89402656A
Other languages
German (de)
French (fr)
Other versions
EP0367642B1 (en
Inventor
Gabriel De Smet
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 FR8813042A external-priority patent/FR2637207B1/en
Priority claimed from FR8900545A external-priority patent/FR2641720B1/en
Application filed by Sollac SA, Lorraine de Laminage Continu SA SOLLAC filed Critical Sollac SA
Priority to AT89402656T priority Critical patent/ATE88384T1/en
Publication of EP0367642A1 publication Critical patent/EP0367642A1/en
Application granted granted Critical
Publication of EP0367642B1 publication Critical patent/EP0367642B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J9/00—Apparatus or processes specially adapted for the manufacture, installation, removal, maintenance of electric discharge tubes, discharge lamps, or parts thereof; Recovery of material from discharge tubes or lamps
    • H01J9/20—Manufacture of screens on or from which an image or pattern is formed, picked up, converted or stored; Applying coatings to the vessel
    • 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
    • B21D22/10—Stamping using yieldable or resilient pads
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J9/00—Apparatus or processes specially adapted for the manufacture, installation, removal, maintenance of electric discharge tubes, discharge lamps, or parts thereof; Recovery of material from discharge tubes or lamps
    • H01J9/02—Manufacture of electrodes or electrode systems
    • H01J9/14—Manufacture of electrodes or electrode systems of non-emitting electrodes
    • H01J9/142—Manufacture of electrodes or electrode systems of non-emitting electrodes of shadow-masks for colour television tubes
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J2229/00—Details of cathode ray tubes or electron beam tubes
    • H01J2229/07—Shadow masks
    • H01J2229/0722—Frame

Definitions

  • the subject of the present invention is a method and a device for forming a sheet blank, in particular for producing a cathode ray tube mask.
  • the subject of the invention is also a cathode-ray tube mask obtained by this method.
  • the sheet blank is held at its peripheral part and one acts on the central part of the latter under the action of lowering or raising a punch which gradually forms the blank by falling off the peripheral edge.
  • the peripheral part undergoes a shrinking given the decrease in the perimeter from the outside, while the central part is expanding.
  • One is therefore led to avoid the formation of folds to increase the pressure under the blank holder, which leads to increasing the tensile force to be exerted on the central part as a function of the peripheral forces and consequently the elongation of the metal in this part.
  • the masks for cathode ray tubes are produced from an extra-thin sheet metal blank comprising at its central part a network of micro-perforations which have to meet extremely severe requirements regarding the positioning and shape of the perforations.
  • the masks for cathode ray tubes have been produced by conventional drawing of the central part with punch and die, in heating the peripheral part of the sheet blank to a suitable temperature to make the latter more ductile and therefore favor its deformation by limiting the tensile force in the central part.
  • heating has the disadvantage of causing the appearance of oxides and requiring pickling and cooling in the central part of the sheet blank.
  • the object of the invention is to provide a cold-working method of forming a sheet blank and producing, in a single operation, the curve of the central part and the falling or lifting of the peripheral zone of the sheet blank. , without deforming the network of perforations, while avoiding the drawbacks of the calorific contribution mentioned above.
  • the energy of the peripheral deformation is therefore no longer of thermo-mechanical origin, but of mechanical origin.
  • the subject of the invention is therefore a method of forming a sheet blank, in particular for producing a cathode-ray tube mask, on a press, characterized in that: - the sheet blank is placed between a deformable punch and a deformable matrix, the peripheral part of the sheet blank is held over a small width in a peripheral tightening member, - the central part of the sheet blank is clamped between the deformable punch and the deformable matrix, - the central part of the sheet metal blank is formed, according to a determined curve, by deforming the punch and the die under the effect of an upper sole so as to place the average fiber of the sheet blank in a determined position, with respect to to the neutral fiber of the punch and die assembly, such that one can generate, at least in localized areas of said sheet blank, an adjustable internal stress, - We exert, on localized areas of the clamping member, a mechanical action by bringing the opposite elements of said clamping member to achieve on the free part of the sheet blank located between the punch and the clamping member, buck
  • the invention also relates to a device for forming a sheet blank, in particular for producing a cathode-ray tube mask, on a press comprising a die and a punch, characterized in that the die and the punch are produced in a deformable material and in that it comprises a member for clamping the periphery of the sheet blank, means for exerting in localized areas a mechanical action on the clamping member by bringing the opposite elements of the clamping member together, means for relative displacement of the clamping member relative to the punch or the die, and complementary means for controlling the buckling and unwinding the peripheral part of the sheet blank along the side walls of the punch or die in order to obtain the final fallen edge.
  • the invention also relates to a cathode-ray tube mask produced according to the method mentioned above.
  • FIG. 1 represents a sheet blank 1 of very small thickness from which a mask for cathode ray tube is produced.
  • This sheet blank has a central part 1a provided with a network of micro-perforations and a peripheral part 1b not perforated.
  • the mask produced after forming therefore has its central part 1a corresponding to the network of curved micro-perforations and its peripheral edge 1b raised, as appears in FIG. 2.
  • the forming device shown in FIG. 3 for producing a cathode-ray tube mask comprises a lower sole 10 on which a base of matrix 11 rests. This base of matrix 11 is provided at its central part with an imprint 12.
  • the forming device Above the bottom of the matrix 11, the forming device comprises a deformable matrix 13 which rests on the bottom of the matrix 11 by its peripheral part 14.
  • the matrix 13 is connected by a rod 15 to a locking system 16 constituted for example by a jack.
  • the forming device also comprises a deformable punch 17 supported by an intermediate sole 18 which is itself supported by an upper sole 19 by means of balusters 20 slidably mounted in said upper sole. Compression springs 21 are interposed between the two soles 18 and 19.
  • the die 13 and the punch 17 are made of deformable material and the underside of the punch 17 may include a peripheral ring 22 intended to prevent the sliding of the sheet blank outward when it is formed.
  • the upper sole 19 supports cams 23 which pass through the sole 18 through the openings 24.
  • Each cam 23 has on its inner face specific profiles 23a, 23b and 23c.
  • the forming device comprises around the die 13 and the punch 17 and at the level of the plane of separation of these two elements, a peripheral clamping member 30 intended to clamp to a small width the peripheral part 1b of the sheet blank 1.
  • This clamping member 30 made for example of composite material consists of an upper clamp 31 and a lower clamp 32 and has the shape of a frame as shown in FIG. 4.
  • the upper clamp 31 is supported by a plate 33, by means of the screws 34 arranged inside the oblong holes 35 provided in the upper clamp 31, so as to allow lateral movement of said clamp relative to the plate 33.
  • This plate 33 is supported by the intermediate sole 18 by balusters 36 slidably mounted in said sole. Compression springs 37 are interposed between the plate 33 and the midsole 18.
  • the upper clamp 31 has an inclined lateral face 31a intended to cooperate with the inclined face 23c of the cams 23, in order to exert in localized areas, a lateral mechanical action on the clamping member 30.
  • the lower clamp 32 comprises on the one hand guide rods 38 intended to penetrate holes 39 provided inside the upper clamp 31 and on the other hand pins 40 uniformly distributed around the periphery of the clamp 32 and intended to center the sheet blank 1.
  • the pins 40 penetrate into holes 41 provided in the upper clamp 31 when the clamping member 30 is closed.
  • the lower clamp 32 is supported by a frame 42 resting on counter-cams 43 which are themselves in abutment on the lower flange 10.
  • the frame 42 has an external inclined face 42a.
  • Each cam follower 43 has on its upper face a first inclined face 43a intended to cooperate with the inclined face 23a of the cams 23, a second inclined face 43b intended to cooperate with the inclined face 42a of the frame 42, and a third inclined face 43c intended to cooperate with complementary means 50 to orient the buckling, as will be seen later.
  • Springs 44 are arranged between the bottom of the die 11 and each cam follower 43.
  • the complementary means for orienting the buckling can be constituted by a deformable peripheral blade 50, inserted between the die 13 and the lower clamp 32 to orient the buckling of the free part 1b of the sheet blank 1 in a uniform manner and in the same direction.
  • the blade 50 is constituted by an elastic blade made for example of composite material.
  • a first part 50a of the blade 50 is supported on a support 51 in the form of a frame and surrounding the matrix bottom 11.
  • the support 51 comprises a vertical wall plate 51a in contact with the outer wall of the die bottom 11 and a horizontal base plate 51b contiguous to an edge of the wall plate at a right angle thereto.
  • the base plate 51b has its lower face 51c inclined at the same slope as the inclined face 43c of the cams 43.
  • a second part 50b of the blade 50 is supported on a pusher 52 formed by a vertical plate whose lower end rests on the base plate 51b of the support 51.
  • Springs 53 are disposed between the wall plate 51a and the plate 52 so as to keep said plates spaced apart and in contact respectively with the outer wall of the die bottom 11 and with the inner lateral wall of the lower clamp 32.
  • the blade 50 has been shown below the sheet blank 1, which leads to a lifting of the edge, but it is obvious that one can conceive of a symmetrical version in which the edge has fallen using a blade arranged above the blank and which is used to print a downward movement.
  • the sheet blank 1 is formed as follows.
  • the sheet blank 1 is placed on the matrix 13 so that a small width of its peripheral edge also rests on the lower clamp 32 inside the zone delimited by the pins 40.
  • the real average fiber of the sheet blank 1 is placed in a position relative to the neutral fiber of the assembly constituted by the punch 17 and the matrix 13 as can generate at least in localized areas of said sheet blank, an adjustable internal stress available to cancel any stresses induced by external phenomena such as thermal expansion and vibrations generated by acoustic, magnetic and other phenomena.
  • the deformation is exerted with respect to the average fiber of the metal constituting the sheet blank to have a homogeneous deformation and so as not to deteriorate the precision of the micro-perforations in the central part of the sheet blank.
  • the upper part of the blade 50 is supported below the peripheral zone 1b of the sheet blank (FIG. 6).
  • controlled buckling of the free part 1b of the sheet blank is carried out between the punch 17 and the clamping member 30.
  • the intermediate sole 18 being in abutment on the columns 25 and while maintaining by the clamping member 30 the peripheral part 1b of the sheet blank 1 under the action of the springs 37, it is exerted on localized zones clamps 31 and 32 of the clamping member 30, a mechanical action illustrated by the arrows F1 ( Figures 7 to 9).
  • this mechanical action on each opposite branch of the clamping member 30 has the effect of inducing, by means of the small pins 40, a pushing action on the peripheral part of the sheet blank which is entirely original by compared to a conventional stamping operation carried out under the pulling action exerted by the blank under the punch.
  • the bringing together of the opposite branches of the clamping member 30 causes on the part free 1b of the sheet blank 1, controlled buckling.
  • This oriented buckling and occurring around the mean fiber of the sheet blank is carried out in such a way that the deformation of the peripheral zone of the sheet blank corresponds to a flow of the material, such as the thickness of the blank and the perimeter of the latter be kept substantially constant.
  • This mechanical action also causes a simultaneous movement of bringing the two parts 50a and 50b of the blade 50 illustrated by the arrows F2 and rising from the top of the blade 50 illustrated by the arrow F3 ( Figures 7 and 8).
  • the role of this combined movement of raising and moving the blade 50 is to orient the buckling of the free part 1b of the sheet blank 1 located between the punch-die assembly and the clamping member 30.
  • the next phase of the process (FIGS. 10 and 11) consists in unwinding the edge 1b of the sheet blank 1 by translation in a simultaneous upward movement of the clamping member 30 and the blade 50 respectively according to arrows F4 and F5.
  • the cams 23 impart via the inclined faces 23a and 43a a movement transverse to the cams 43 against the springs 44.
  • the transverse movement F6 of the cams 43 in turn simultaneously prints an upward movement F4 to l clamping member 30 via the inclined face 43b of said cams and the inclined face 42a of the frame 42 and an upward movement F5 to the blade 50 via the inclined face 43c of the cams and of the inclined face 51c of the support 51.
  • the slope of the inclined face 43b is greater than that of the inclined face 43c so as to obtain a vertical displacement of the clamping member 30 faster than that of the blade 50.
  • the end of the free edge 1b of the sheet metal blank 1 is pressed against the side wall of the punch 17 by mounting the blade 50.
  • the upper sole 19 is ascent which causes the device to open by raising the cams 23, the midsole 18, the punch 17 and the upper clamp 31.
  • the jack 16 is always kept at bottom dead center to avoid the rising of the matrix 13 which would cause a deformation of the sheet blank 1 formed.

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  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Mechanical Engineering (AREA)
  • Shaping Metal By Deep-Drawing, Or The Like (AREA)
  • Forging (AREA)
  • Treatment Of Fiber Materials (AREA)
  • Bending Of Plates, Rods, And Pipes (AREA)
  • Physical Vapour Deposition (AREA)

Abstract

The subject of the present invention is a method for shaping a sheet-metal blank (1), especially for producing a cathode-ray tube mask on a press, according to which the peripheral part of the sheet- metal blank (1) is held over a small width in a peripheral member (30), the central part of the sheet-metal blank (1) is shaped to a specific contour by deforming the stamp (17) and the die (13) under the effect of an upper sole plate (19), a mechanical action is exerted on localised zones of the clamping member (30) by bringing the opposite elements of the said clamping member towards one another, and simultaneously the peripheral zone of the sheet-metal blank (1) is laid and unrolled along the lateral walls of the stamp (17) or of the die (13) as a result of a relative movement of the clamping member (30) in relation to the stamp (17) or to the die (13), in order to obtain the final dropped edge. <??>The invention also relates to a cathode-ray tube mask produced by this method. <IMAGE>

Description

La présente invention a pour objet un procédé et un dispositif de formage d'un flan de tôle notamment pour réaliser un masque de tube cathodique.The subject of the present invention is a method and a device for forming a sheet blank, in particular for producing a cathode ray tube mask.

L'invention a également pour objet un masque de tube cathodique obtenu selon ce procédé.The subject of the invention is also a cathode-ray tube mask obtained by this method.

Dans un procédé classique de formage d'un flan de tôle, on tient le flan de tôle à sa partie périphérique et on agit sur la partie centrale de ce dernier sous l'action de descente ou de montée d'un poinçon qui forme progressivement le flan en tombant le bord périphérique. Dans ce procédé, la partie périphérique subit un rétreint compte-tenu de la diminution du périmètre en partant de l'extérieur, alors que la partie centrale est en expansion. On est donc conduit pour éviter la formation de plis à accroître la pression sous serre-flan, ce qui conduit à accroître la force de traction à exercer sur la partie centrale en fonction des efforts périphériques et par voie de conséquence l'allongement du métal dans cette partie.In a conventional method of forming a sheet blank, the sheet blank is held at its peripheral part and one acts on the central part of the latter under the action of lowering or raising a punch which gradually forms the blank by falling off the peripheral edge. In this process, the peripheral part undergoes a shrinking given the decrease in the perimeter from the outside, while the central part is expanding. One is therefore led to avoid the formation of folds to increase the pressure under the blank holder, which leads to increasing the tensile force to be exerted on the central part as a function of the peripheral forces and consequently the elongation of the metal in this part.

Or ceci est inacceptable pour certaines applications dans lesquelles on ne peut tolérer de déformation par allongement, en particulier dans le cas de tôles extra-minces ou/et perforées notamment pour des masques de tubes cathodiques.However, this is unacceptable for certain applications in which deformation by elongation cannot be tolerated, in particular in the case of extra-thin or perforated sheets, in particular for masks of cathode-ray tubes.

En effet, on sait que les masques pour tubes cathodiques sont réalisés à partir d'un flan de tôle extra-mince comportant à sa partie centrale un réseau de micro-perforations devant répondre à des exigences extrêmement sévères de positionnement et de forme des perforations.In fact, it is known that the masks for cathode ray tubes are produced from an extra-thin sheet metal blank comprising at its central part a network of micro-perforations which have to meet extremely severe requirements regarding the positioning and shape of the perforations.

Jusqu'à présent, les masques pour tubes ca­thodiques sont réalisés par un emboutissage classique de la partie centrale avec poinçon et matrice, en chauffant la partie périphérique du flan de tôle à une température adaptée pour rendre cette dernière plus ductile et donc favoriser sa déformation en limitant l'effort de traction dans la partie centrale.Until now, the masks for cathode ray tubes have been produced by conventional drawing of the central part with punch and die, in heating the peripheral part of the sheet blank to a suitable temperature to make the latter more ductile and therefore favor its deformation by limiting the tensile force in the central part.

Mais, le chauffage a toutefois pour inconvé­nient de provoquer l'apparition d'oxydes et de néces­siter un décapage et un refroidissement dans la partie centrale du flan de tôle.However, heating has the disadvantage of causing the appearance of oxides and requiring pickling and cooling in the central part of the sheet blank.

Par ailleurs, pour tenir compte de l'allon­gement du métal sous l'effet du poinçon dans l'opéra­tion d'emboutissage, il était nécessaire de donner aux micro-perforations réalisées par un procédé d'attaque chimique sur le flan de tôle une forme initiale spéci­fique telle que ces dernières aient, après emboutissa­ge, la forme désirée.Furthermore, to take account of the elongation of the metal under the effect of the punch in the stamping operation, it was necessary to give the micro-perforations produced by a chemical attack process on the sheet blank a shape specific initial such that the latter have, after stamping, the desired shape.

L'invention a pour but de fournir un procédé fonctionnant à froid, de formage d'un flan de tôle et réalisant, en une seule opération, le galbe de la par­tie centrale et le tombage ou le relevage de la zone périphérique du flan de tôle, sans déformer le réseau de perforations, tout en évitant les inconvénients de l'apport calorifique mentionné précédemment.The object of the invention is to provide a cold-working method of forming a sheet blank and producing, in a single operation, the curve of the central part and the falling or lifting of the peripheral zone of the sheet blank. , without deforming the network of perforations, while avoiding the drawbacks of the calorific contribution mentioned above.

L'énergie de la déformation périphérique n'est donc plus d'origine thermo-mécanique, mais d'origine mécanique.The energy of the peripheral deformation is therefore no longer of thermo-mechanical origin, but of mechanical origin.

L'invention a ainsi pour objet un procédé de formage d'un flan de tôle, notamment pour réaliser un masque de tube cathodique, sur une presse, caractérisé en ce que :
- on dispose le flan de tôle entre un poin­çon déformable et une matrice déformable,
- on tient la partie périphérique du flan de tôle sur une faible largeur dans un organe de serrage périphérique,
- on serre la partie centrale du flan de tôle entre le poinçon déformable et la matrice défor­mable,
- on forme, selon un galbe déterminé, la partie centrale du flan de tôle en déformant le poinçon et la matrice sous l'effet d'une semelle supé­rieure de façon à placer la fibre moyenne du flan de tôle dans une position déterminée, par rapport à la fibre neutre de l'ensemble poinçon et matrice, telle que l'on puisse engendrer, au moins dans des zones localisées dudit flan de tôle, une contrainte interne réglable,
- on exerce, sur des zones localisées de l'organe de serrage, une action mécanique en rapprochant les éléments opposés dudit organe de serrage pour réaliser sur la partie libre du flan de tôle située entre le poinçon et l'organe de serrage, un flambage contrôlé et orienté par une action motrice sur la partie périphérique du flan de tôle, tout en conservant une épaisseur et un périmètre sensiblement constants dudit flan de tôle,
- et simultanément on applique et on déroule la zone périphérique du flan de tôle le long des pa­rois du poinçon ou de la matrice, par un mouvement re­latif de l'organe de serrage par rapport au poinçon ou à la matrice pour obtenir le bord tombé final.The subject of the invention is therefore a method of forming a sheet blank, in particular for producing a cathode-ray tube mask, on a press, characterized in that:
- the sheet blank is placed between a deformable punch and a deformable matrix,
the peripheral part of the sheet blank is held over a small width in a peripheral tightening member,
- the central part of the sheet blank is clamped between the deformable punch and the deformable matrix,
- the central part of the sheet metal blank is formed, according to a determined curve, by deforming the punch and the die under the effect of an upper sole so as to place the average fiber of the sheet blank in a determined position, with respect to to the neutral fiber of the punch and die assembly, such that one can generate, at least in localized areas of said sheet blank, an adjustable internal stress,
- We exert, on localized areas of the clamping member, a mechanical action by bringing the opposite elements of said clamping member to achieve on the free part of the sheet blank located between the punch and the clamping member, buckling controlled and oriented by a driving action on the peripheral part of the sheet blank, while retaining a substantially constant thickness and perimeter of said sheet blank,
- and simultaneously the peripheral zone of the sheet metal blank is applied and unwound along the walls of the punch or of the die, by a relative movement of the clamping member with respect to the punch or the die to obtain the final fallen edge .

L'invention a également pour objet un dispo­sitif de formage d'un flan de tôle, notamment pour réaliser un masque de tube cathodique, sur une presse comprenant une matrice et un poinçon, caractérisé en ce que la matrice et le poinçon sont réalisés en un matériau déformable et en ce qu'il comporte un organe de serrage de la périphérie du flan de tôle, des moyens pour exercer dans des zones localisées une action mécanique sur l'organe de serrage en rappro­chant les éléments opposés de l'organe de serrage, des moyens de déplacement relatif de l'organe de serrage par rapport au poinçon ou à la matrice, et des moyens complémentaires pour contrôler le flambage et dérouler la partie périphérique du flan de tôle le long des parois latérales du poinçon ou de la matrice afin d'obtenir le bord tombé final.The invention also relates to a device for forming a sheet blank, in particular for producing a cathode-ray tube mask, on a press comprising a die and a punch, characterized in that the die and the punch are produced in a deformable material and in that it comprises a member for clamping the periphery of the sheet blank, means for exerting in localized areas a mechanical action on the clamping member by bringing the opposite elements of the clamping member together, means for relative displacement of the clamping member relative to the punch or the die, and complementary means for controlling the buckling and unwinding the peripheral part of the sheet blank along the side walls of the punch or die in order to obtain the final fallen edge.

L'invention a aussi pour objet un masque de tube cathodique réalisé selon le procédé mentionné précédemment.The invention also relates to a cathode-ray tube mask produced according to the method mentioned above.

L'invention sera mieux comprise à l'aide de la description qui va suivre, donnée uniquement à titre d'exemple et faite en se référant aux dessins annexés, sur lesquels :

  • - La figure 1 est une vue en perspective d'un flan de tôle à partir duquel est réalisé un masque de tube cathodique,
  • - la figure 2 est une vue en perspective d'un masque formé,
  • - la figure 3 est une vue en coupe du dispositif selon l'invention,
  • - la figure 4 est une vue en perspective schématique de l'organe de serrage de la partie périphérique du flan de tôle et des moyens d'orien­tation du flambage de la partie libre dudit flan,
  • - les figures 5 à 11 sont des vues en coupe montrant les étapes successives de formage d'un masque.
The invention will be better understood with the aid of the description which follows, given solely by way of example and made with reference to the appended drawings, in which:
  • FIG. 1 is a perspective view of a sheet blank from which a cathode ray tube mask is made,
  • FIG. 2 is a perspective view of a mask formed,
  • FIG. 3 is a sectional view of the device according to the invention,
  • FIG. 4 is a schematic perspective view of the member for clamping the peripheral part of the sheet blank and means for orienting the buckling of the free part of said blank,
  • - Figures 5 to 11 are sectional views showing the successive steps of forming a mask.

La figure 1 représente un flan de tôle 1 de très faible épaisseur à partir duquel est réalisé un masque de tube cathodique. Ce flan de tôle comporte une partie centrale 1a munie d'un réseau de micro-­perforations et une partie périphérique 1b non perforée.FIG. 1 represents a sheet blank 1 of very small thickness from which a mask for cathode ray tube is produced. This sheet blank has a central part 1a provided with a network of micro-perforations and a peripheral part 1b not perforated.

Le masque réalisé après formage a donc sa partie centrale 1a correspondant au réseau de micro-­perforations galbé et son bord périphérique 1b relevé, comme cela apparaît à la figure 2.The mask produced after forming therefore has its central part 1a corresponding to the network of curved micro-perforations and its peripheral edge 1b raised, as appears in FIG. 2.

Le dispositif de formage représenté à la figure 3 pour réaliser un masque de tube cathodique comporte une semelle inférieure 10 sur laquelle repose un fond de matrice 11. Ce fond de matrice 11 est muni à sa partie centrale d'une empreinte 12.The forming device shown in FIG. 3 for producing a cathode-ray tube mask comprises a lower sole 10 on which a base of matrix 11 rests. This base of matrix 11 is provided at its central part with an imprint 12.

Au-dessus du fond de matrice 11, le disposi­tif de formage comporte une matrice déformable 13 qui repose sur le fond de matrice 11 par sa partie périphérique 14.Above the bottom of the matrix 11, the forming device comprises a deformable matrix 13 which rests on the bottom of the matrix 11 by its peripheral part 14.

La matrice 13 est reliée par une tige 15 à un système de verrouillage 16 constitué par exemple par un vérin.The matrix 13 is connected by a rod 15 to a locking system 16 constituted for example by a jack.

Le dispositif de formage comprend également un poinçon déformable 17 supporté par une semelle intermédiaire 18 qui est elle-même supportée par une semelle supérieure 19 par l'intermédiaire de colon­nettes 20 montées coulissantes dans ladite semelle supérieure. Des ressorts de compression 21 sont interposés entre les deux semelles 18 et 19.The forming device also comprises a deformable punch 17 supported by an intermediate sole 18 which is itself supported by an upper sole 19 by means of balusters 20 slidably mounted in said upper sole. Compression springs 21 are interposed between the two soles 18 and 19.

La matrice 13 et le poinçon 17 sont réalisés en matériau déformable et la face inférieure du poin­çon 17 peut comporter un jonc périphérique 22 destiné à empêcher le glissement du flan de tôle vers l'exté­rieur au moment de son formage.The die 13 and the punch 17 are made of deformable material and the underside of the punch 17 may include a peripheral ring 22 intended to prevent the sliding of the sheet blank outward when it is formed.

D'autre part, la semelle supérieure 19 supporte des cames 23 qui traversent la semelle 18 par les ouvertures 24.On the other hand, the upper sole 19 supports cams 23 which pass through the sole 18 through the openings 24.

Chaque came 23 comporte sur sa face intéri­eure des profils spécifiques 23a, 23b et 23c.Each cam 23 has on its inner face specific profiles 23a, 23b and 23c.

La course verticale de la semelle intermé­diaire 18 et par conséquent du poinçon 17 est limitée par des colonnes 25 montées sur la semelle inférieure 10.The vertical stroke of the intermediate sole 18 and consequently of the punch 17 is limited by columns 25 mounted on the lower sole 10.

Le dispositif de formage comporte autour de la matrice 13 et du poinçon 17 et au niveau du plan de séparation de ces deux éléments, un organe de serrage périphérique 30 destiné à serrer sur une faible largeur la partie périphérique 1b du flan de tôle 1. Cet organe de serrage 30 réalisé par exemple en matériau composite est constitué d'une pince supé­rieure 31 et d'une pince inférieure 32 et a la forme d'un cadre comme représenté à la figure 4.The forming device comprises around the die 13 and the punch 17 and at the level of the plane of separation of these two elements, a peripheral clamping member 30 intended to clamp to a small width the peripheral part 1b of the sheet blank 1. This clamping member 30 made for example of composite material consists of an upper clamp 31 and a lower clamp 32 and has the shape of a frame as shown in FIG. 4.

La pince supérieure 31 est supportée par un plateau 33, par l'intermédiaire des vis 34 disposées à l'intérieur des trous oblongs 35 prévus dans la pince supérieure 31, de façon à permettre un déplacement latéral de ladite pince par rapport au plateau 33. Ce plateau 33 est supporté par la semelle intermédiaire 18 par des colonnettes 36 montées coulissantes dans ladite semelle. Des ressorts de compression 37 sont interposés entre le plateau 33 et la semelle intermédiaire 18.The upper clamp 31 is supported by a plate 33, by means of the screws 34 arranged inside the oblong holes 35 provided in the upper clamp 31, so as to allow lateral movement of said clamp relative to the plate 33. This plate 33 is supported by the intermediate sole 18 by balusters 36 slidably mounted in said sole. Compression springs 37 are interposed between the plate 33 and the midsole 18.

Enfin, la pince supérieure 31 comporte une face latérale inclinée 31a destinée à coopérer avec la face inclinée 23c des cames 23, pour exercer dans des zones localisées, une action mécanique latérale sur l'organe de serrage 30.Finally, the upper clamp 31 has an inclined lateral face 31a intended to cooperate with the inclined face 23c of the cams 23, in order to exert in localized areas, a lateral mechanical action on the clamping member 30.

La pince inférieure 32 comporte d'une part des tiges de guidage 38 destinées à pénétrer dans des trous 39 prévus à l'intérieur de la pince supérieure 31 et d'autre part des pions 40 uniformément répartis sur le pourtour de la pince 32 et destinés à centrer le flan de tôle 1. Les pions 40 pénétrent dans des trous 41 prévus dans la pince supérieure 31 lorsque que l'organe de serrage 30 est fermé.The lower clamp 32 comprises on the one hand guide rods 38 intended to penetrate holes 39 provided inside the upper clamp 31 and on the other hand pins 40 uniformly distributed around the periphery of the clamp 32 and intended to center the sheet blank 1. The pins 40 penetrate into holes 41 provided in the upper clamp 31 when the clamping member 30 is closed.

La pince inférieure 32 est supportée par un cadre 42 reposant sur des contre-cames 43 qui sont elles-mêmes en appui sur la semelle inférieure 10. Le cadre 42 comporte une face inclinée extérieure 42a.The lower clamp 32 is supported by a frame 42 resting on counter-cams 43 which are themselves in abutment on the lower flange 10. The frame 42 has an external inclined face 42a.

Chaque contre-came 43 comporte sur sa face supérieure une première face inclinée 43a destinée à coopérer avec la face inclinée 23a des cames 23, une deuxième face inclinée 43b destinée à coopérer avec la face inclinée 42a du cadre 42, et une troisième face inclinée 43c destinée à coopérer avec des moyens complémentaires 50 pour orienter le flambage, comme on le verra ultérieurement.Each cam follower 43 has on its upper face a first inclined face 43a intended to cooperate with the inclined face 23a of the cams 23, a second inclined face 43b intended to cooperate with the inclined face 42a of the frame 42, and a third inclined face 43c intended to cooperate with complementary means 50 to orient the buckling, as will be seen later.

Des ressorts 44 sont disposés entre le fond de matrice 11 et chaque contre-came 43.Springs 44 are arranged between the bottom of the die 11 and each cam follower 43.

Les moyens complémentaires pour orienter le flambage peuvent être constitués par une lame péri­phérique 50 déformable, insérée entre la matrice 13 et la pince inférieure 32 pour orienter le flambage de la partie libre 1b du flan de tôle 1 de façon uniforme et dans le même sens.The complementary means for orienting the buckling can be constituted by a deformable peripheral blade 50, inserted between the die 13 and the lower clamp 32 to orient the buckling of the free part 1b of the sheet blank 1 in a uniform manner and in the same direction.

La lame 50 est constituée par une lame élastique réalisée par exemple en matériau composite.The blade 50 is constituted by an elastic blade made for example of composite material.

Selon un mode de réalisation illustré dans la présente demande, une première partie 50a de la lame 50 est en appui sur un support 51 en forme de cadre et entourant le fond de matrice 11. Le support 51 comporte une plaque de paroi 51a verticale en contact avec la paroi extérieure du fond de matrice 11 et une plaque de base horizontale 51b contiguë à un bord de la plaque de paroi en faisant un angle droit avec celle-ci. La plaque de base 51b a sa face inférieure 51c inclinée selon la même pente que la face inclinée 43c des contre-cames 43.According to an embodiment illustrated in the present application, a first part 50a of the blade 50 is supported on a support 51 in the form of a frame and surrounding the matrix bottom 11. The support 51 comprises a vertical wall plate 51a in contact with the outer wall of the die bottom 11 and a horizontal base plate 51b contiguous to an edge of the wall plate at a right angle thereto. The base plate 51b has its lower face 51c inclined at the same slope as the inclined face 43c of the cams 43.

Une deuxième partie 50b de la lame 50 est en appui sur un poussoir 52 formé par une plaque verticale dont l'extrémité inférieure repose sur la plaque de base 51b du support 51. Des ressorts 53 sont disposés entre la plaque de paroi 51a et la plaque 52 de façon à maintenir lesdites plaques écartées et respectivement en appui sur la paroi extérieure du fond de matrice 11 et sur la paroi latérale interne de la pince inférieure 32.A second part 50b of the blade 50 is supported on a pusher 52 formed by a vertical plate whose lower end rests on the base plate 51b of the support 51. Springs 53 are disposed between the wall plate 51a and the plate 52 so as to keep said plates spaced apart and in contact respectively with the outer wall of the die bottom 11 and with the inner lateral wall of the lower clamp 32.

Dans le mode de réalisation illustré, la lame 50 a été représentée en-dessous du flan de tôle 1, ce qui conduit à un relevage du bord, mais il est évident que l'on peut concevoir une version symétrique dans laquelle le bord est tombé à l'aide d'une lame disposée au-dessus du flan et à laquelle on imprime un mouvement descendant.In the illustrated embodiment, the blade 50 has been shown below the sheet blank 1, which leads to a lifting of the edge, but it is obvious that one can conceive of a symmetrical version in which the edge has fallen using a blade arranged above the blank and which is used to print a downward movement.

Le formage du flan de tôle 1 est réalisé de la façon suivante.The sheet blank 1 is formed as follows.

Tout d'abord, on pose le flan de tôle 1 sur la matrice 13 de telle sorte qu'une faible largeur de son bord périphérique repose également sur la pince inférieure 32 à l'intérieur de la zone délimitée par les pions 40.First of all, the sheet blank 1 is placed on the matrix 13 so that a small width of its peripheral edge also rests on the lower clamp 32 inside the zone delimited by the pins 40.

Sous l'action d'un coulisseau, non représen­té, de la presse qui agit sur la semelle supérieure 19, on descend la partie supérieure du dispositif de façon à venir appliquer le poinçon 17 sur le flan de tôle 1 et à fermer l'organe de serrage 30 pour maintenir la partie périphérique dudit flan sur une faible largeur entre les pinces 31 et 32 (figure 5). Les tiges de guidage 38 et les pions 40 pénètrent respectivement dans les trous 39 et 41 de la pince supérieure 31.Under the action of a slide, not shown, of the press which acts on the upper sole 19, the upper part of the device is lowered so as to come to apply the punch 17 to the sheet blank 1 and to close the member clamp 30 to maintain the peripheral portion of said blank over a small width between the clamps 31 and 32 (Figure 5). The guide rods 38 and the pins 40 penetrate respectively into the holes 39 and 41 of the upper clamp 31.

Toujours sous l'action du coulisseau de la presse, on fait fléchir par l'intermédiaire des semelles 19 et 19, le poinçon déformable 17 et la matrice déformable 13 pour ainsi former un galbe souhaité de la partie centrale du flan de tôle 1. Cette position est maintenue par le vérin 16 au point mort bas (figure 6). Le jonc 22 empêche tout glissement du flan de tôle.Still under the action of the press slide, the deformable punch 17 and the deformable matrix 13 are bent by means of soles 19 and 19, thereby forming a desired curve of the central part of the sheet blank 1. This position is maintained by the actuator 16 at bottom dead center (Figure 6). The ring 22 prevents any sliding of the sheet blank.

Sous l'effet du ressort de compression 37 et du plateau 33, la pince supérieure 31 est plaquée sur la pince inférieure 32 maintenue en position par le cadre 42 et les contre-cames 43. La partie périphéri­que du flan de tôle 1 se trouve ainsi serrée.Under the effect of the compression spring 37 and the plate 33, the upper clamp 31 is pressed against the lower clamp 32 held in position by the frame 42 and the cams 43. The peripheral part of the sheet blank 1 is thus tight.

Au cours de cette étape de formage de la partie centrale, la fibre moyenne réelle du flan de tôle 1 est placée dans une position par rapport à la fibre neutre de l'ensemble constitué par le poinçon 17 et la matrice 13 telle que l'on puisse engendrer au moins dans des zones localisées dudit flan de tôle, une contrainte interne réglable disponible pour annuler les éventuelles contraintes induites par des phénomènes extérieurs tels que la dilatation thermique et les vibrations générées par les phénomènes acous­tiques, magnétiques et autres.During this stage of forming the central part, the real average fiber of the sheet blank 1 is placed in a position relative to the neutral fiber of the assembly constituted by the punch 17 and the matrix 13 as can generate at least in localized areas of said sheet blank, an adjustable internal stress available to cancel any stresses induced by external phenomena such as thermal expansion and vibrations generated by acoustic, magnetic and other phenomena.

Ainsi, en modifiant la position du flan de tôle par rapport à la fibre neutre de l'ensemble poinçon 17 - matrice 13, on peut engendrer, au moins dans des zones localisées du flan de tôle, des contraintes internes de compression ou de traction en fonction de l'utilisation ultérieure de la pièce formée.Thus, by modifying the position of the sheet blank relative to the neutral fiber of the punch 17 - die 13 assembly, it is possible to generate, at least in localized areas of the sheet blank, internal compressive or tensile stresses. depending on the subsequent use of the formed part.

De plus, on exerce la déformation par rapport à la fibre moyenne du métal constituant le flan de tôle pour avoir une déformation homogène et pour ne pas détériorer la précision des micro-per­forations de la partie centrale du flan de tôle.In addition, the deformation is exerted with respect to the average fiber of the metal constituting the sheet blank to have a homogeneous deformation and so as not to deteriorate the precision of the micro-perforations in the central part of the sheet blank.

Pendant cette étape de formage du galbe, la partie supérieure de la lame 50 est en appui au-des­sous de la zone périphérique 1b du flan de tôle (figure 6).During this shaping step, the upper part of the blade 50 is supported below the peripheral zone 1b of the sheet blank (FIG. 6).

A l'issue de cette étape de formage du galbe, on réalise le flambage contrôlé de la partie libre 1b du flan de tôle située entre le poinçon 17 et l'organe de serrage 30.At the end of this shaping step, controlled buckling of the free part 1b of the sheet blank is carried out between the punch 17 and the clamping member 30.

A cet effet, la semelle intermédiaire 18 étant en butée sur les colonnes 25 et tout en maintenant par l'organe de serrage 30 la partie périphérique 1b du flan de tôle 1 sous l'action des ressorts 37, on exerce, sur des zones localisées des pinces 31 et 32 de l'organe de serrage 30, une action mécanique illustrée par les flèches F1 (figures 7 à 9).To this end, the intermediate sole 18 being in abutment on the columns 25 and while maintaining by the clamping member 30 the peripheral part 1b of the sheet blank 1 under the action of the springs 37, it is exerted on localized zones clamps 31 and 32 of the clamping member 30, a mechanical action illustrated by the arrows F1 (Figures 7 to 9).

Cette action mécanique est réalisée en descendant les cames 23 par l'intermédiaire de la semelle supérieure 19 de telle sorte que la face inclinée 23c desdites cames entre en contact avec la face inclinée 31a de la pince supérieure 31, ce qui a pour effet de rapprocher les branches opposées de l'organe de serrage 30 (figures 7 à 9).This mechanical action is carried out by lowering the cams 23 via the upper flange 19 so that the inclined face 23c of said cams comes into contact with the inclined face 31a of the upper clamp 31, which has the effect of bringing together the opposite branches of the clamping member 30 (Figures 7 to 9).

De plus, cette action mécanique sur chaque branche opposée de l'organe de serrage 30 a pour effet d'induire par l'intermédiaire des petits pions 40 une action de poussée sur la partie périphérique du flan de tôle qui est tout à fait originale par rapport à un emboutissage classique opéré sous l'action de traction exercée par le flan sous poinçon.In addition, this mechanical action on each opposite branch of the clamping member 30 has the effect of inducing, by means of the small pins 40, a pushing action on the peripheral part of the sheet blank which is entirely original by compared to a conventional stamping operation carried out under the pulling action exerted by the blank under the punch.

Ainsi, le rapprochement des branches oppo­sées de l'organe de serrage 30 provoque sur la partie libre 1b du flan de tôle 1, un flambage contrôlé. Ce flambage orienté et se produisant autour de la fibre moyenne du flan de tôle est réalisé de telle façon que la déformation de la zone périphérique du flan de tôle corresponde à un écoulement de la matière, telle que l'épaisseur du flan et le périmètre de ce dernier soit conservés sensiblement constants.Thus, the bringing together of the opposite branches of the clamping member 30 causes on the part free 1b of the sheet blank 1, controlled buckling. This oriented buckling and occurring around the mean fiber of the sheet blank is carried out in such a way that the deformation of the peripheral zone of the sheet blank corresponds to a flow of the material, such as the thickness of the blank and the perimeter of the latter be kept substantially constant.

Au cours de cette action mécanique sur l'élément de serrage 30, les branches opposées des pinces 31 et 32 se déforment comme cela apparait à la figure 8. Les bords du flan de tôle 1 sont poussés par les pions 40.During this mechanical action on the clamping element 30, the opposite branches of the clamps 31 and 32 are deformed as it appears in FIG. 8. The edges of the sheet blank 1 are pushed by the pins 40.

Cette action mécanique provoque également un mouvement simultané de rapprochement des deux parties 50a et 50b de la lame 50 illustré par les flèches F2 et de montée du sommet de la lame 50 illustré par la flèche F3 (figures 7 et 8).This mechanical action also causes a simultaneous movement of bringing the two parts 50a and 50b of the blade 50 illustrated by the arrows F2 and rising from the top of the blade 50 illustrated by the arrow F3 (Figures 7 and 8).

Ce mouvement combiné de montée et de rapprochement de la lame 50 a pour rôle d'orienter le flambage de la partie libre 1b du flan de tôle 1 située entre l'ensemble poinçon-matrice et l'organe de serrage 30.The role of this combined movement of raising and moving the blade 50 is to orient the buckling of the free part 1b of the sheet blank 1 located between the punch-die assembly and the clamping member 30.

On poursuit, par l'intermédiaire du coulis­seau de la presse, la descente de la semelle supérieu­re 19 et des cames 23, la face inclinée inférieure 23a desdites cames vient en contact avec la face inclinée 43a des contre-cames 43. L'organe de serrage et la lame 50 sont maintenus en position rapprochée comme représenté aux figures 9 et 10 par la paroi latérale des cames 23.The descent of the upper sole 19 and of the cams 23 continues, by means of the press slide, the lower inclined face 23a of said cams comes into contact with the inclined face 43a of the cams 43. The member of clamping and the blade 50 are held in the close position as shown in FIGS. 9 and 10 by the side wall of the cams 23.

La phase suivante du procédé (figures 10 et 11) consiste en un déroulage du bord 1b du flan de tôle 1 par translation dans un mouvement ascendant simultané de l'organe de serrage 30 et de la lame 50 respectivement selon les flèches F4 et F5.The next phase of the process (FIGS. 10 and 11) consists in unwinding the edge 1b of the sheet blank 1 by translation in a simultaneous upward movement of the clamping member 30 and the blade 50 respectively according to arrows F4 and F5.

Pour cela, on continue la descente de la semelle supérieure 19 et des cames 23.For this, the descent of the upper sole 19 and the cams 23 continues.

Les cames 23 impriment par l'intermédiaire des faces inclinées 23a et 43a un mouvement transver­sal aux contre-cames 43 à l'encontre des ressorts 44. Le mouvement transversal F6 des contre-cames 43 imprime à son tour simultanément un déplacement ascendant F4 à l'organe de serrage 30 par l'intermé­diaire de la face inclinée 43b desdites contre-cames et de la face inclinée 42a du cadre 42 et un dépla­cement ascendant F5 à la lame 50 par l'intermédiaire de la face inclinée 43c des contre-cames et de la face inclinée 51c du support 51.The cams 23 impart via the inclined faces 23a and 43a a movement transverse to the cams 43 against the springs 44. The transverse movement F6 of the cams 43 in turn simultaneously prints an upward movement F4 to l clamping member 30 via the inclined face 43b of said cams and the inclined face 42a of the frame 42 and an upward movement F5 to the blade 50 via the inclined face 43c of the cams and of the inclined face 51c of the support 51.

La pente de la face inclinée 43b est plus importante que celle de la face inclinée 43c de façon à obtenir un déplacement vertical de l'organe de serrage 30 plus rapide que celui de la lame 50.The slope of the inclined face 43b is greater than that of the inclined face 43c so as to obtain a vertical displacement of the clamping member 30 faster than that of the blade 50.

Lors de la dernière phase de finition des bords, l'extrémité du bord libre 1b du flan de tôle 1 est plaquée contre la paroi latérale du poinçon 17 par montée de la lame 50.During the last edge finishing phase, the end of the free edge 1b of the sheet metal blank 1 is pressed against the side wall of the punch 17 by mounting the blade 50.

A cet effet, on continue la descente de la semelle supérieure 19 et des cames 23 de manière à poursuivre le déplacement transversal des contre-cames 43. Le cadre 42 échappe au-dessus de la face inclinée 43b des contre-cames 43 pour passer sur la face supérieure 43d ce qui a pour effet d'arrêter le mouvement ascendant de l'organe de serrage 30. Par contre, la lame 50 continue à monter si bien que l'extrémité du bord libre 1b du flan de tôle 1 est plaquée contre la paroi latérale du poinçon 17 (figure 11).To this end, the descent of the upper sole 19 and of the cams 23 is continued so as to continue the transverse movement of the cams 43. The frame 42 escapes above the inclined face 43b of the cams 43 in order to pass over the upper face 43d which has the effect of stopping the upward movement of the clamping member 30. On the other hand, the blade 50 continues to rise so that the end of the free edge 1b of the sheet blank 1 is pressed against the side wall of the punch 17 (Figure 11).

Ensuite, la semelle supérieure 19 est remontée ce qui entraîne l'ouverture du dispositif par la remontée des cames 23, de la semelle intermédiaire 18, du poinçon 17 et de la pince supérieure 31.Then the upper sole 19 is ascent which causes the device to open by raising the cams 23, the midsole 18, the punch 17 and the upper clamp 31.

Sous l'effet des ressorts 44 et 53, les contre-cames 43, la pince inférieure 32 et la lame 50 reprennent leur position initiale.Under the effect of the springs 44 and 53, the cams 43, the lower clamp 32 and the blade 50 return to their initial position.

Le vérin 16 est toujours maintenu au point mort bas pour éviter la remontée de la matrice 13 qui entraînerait une déformation du flan de tôle 1 formé.The jack 16 is always kept at bottom dead center to avoid the rising of the matrix 13 which would cause a deformation of the sheet blank 1 formed.

Enfin, l'extrémité du bord du flan de tôle peut être détourée par un dispositif approprié.Finally, the end of the edge of the sheet blank can be trimmed by an appropriate device.

Claims (21)

1. Procédé de formage d'un flan de tôle (1), notamment pour réaliser un masque de tube cathodique, sur une presse, caractérisé en ce que :
- on dispose le flan de tôle (1) entre un poinçon déformable (17) et une matrice déformable (13),
- on tient la partie périphérique du flan de tôle (1) sur une faible largeur dans un organe de serrage périphérique (30),
- on serre la partie centrale du flan de tôle (1) entre le poinçon déformable (17) et la matrice déformable (13),
- on forme, selon un galbe déterminé, la partie centrale du flan de tôle (1) en déformant le poinçon (17) et la matrice (13) sous l'effet d'une semelle supérieure (19), de façon à placer la fibre moyenne du flan de tôle (1) dans une position déterminée, par rapport à la fibre neutre de l'ensemble poinçon (17) et matrice (13), tel que l'on puisse engendrer, au moins dans des zones localisées dudit flan de tôle (1), une contrainte interne réglable,
- on exerce, sur des zones localisées de l'organe de serrage (30), une action mécanique en rapprochant les éléments opposés dudit organe de serrage pour réaliser sur la partie libre (1b) du flan de tôle (1) située entre l'ensemble poinçon (17) - matrice (13) et l'organe de serrage (30), un flambage contrôlé orienté par une action motrice sur la partie périphérique du flan de tôle (1), tout en conservant une épaisseur et un périmètre sensiblement constants du flan de tôle,
- et simultanément on applique et on déroule la zone périphérique 1b du flan de tôle (1) le long des parois latérales du poinçon (17) ou de la matrice (13), par un mouvement relatif de l'organe de serrage (30) par rapport au poinçon (17) ou à la matrice (13) pour obtenir le bord tombé final.1. A method of forming a sheet blank (1), in particular for producing a cathode-ray tube mask, on a press, characterized in that:
- the sheet blank (1) is placed between a deformable punch (17) and a deformable matrix (13),
the peripheral part of the sheet blank (1) is held over a small width in a peripheral clamping member (30),
- the central part of the sheet blank (1) is clamped between the deformable punch (17) and the deformable matrix (13),
- We form, according to a determined curve, the central part of the sheet blank (1) by deforming the punch (17) and the die (13) under the effect of an upper sole (19), so as to place the average fiber of the sheet blank (1) in a determined position, relative to the neutral fiber of the punch assembly (17) and matrix (13), as can be generated, at least in localized areas of said blank sheet metal (1), an adjustable internal stress,
- It exerts, on localized areas of the clamping member (30), a mechanical action by bringing the opposite elements of said clamping member to achieve on the free part (1b) of the sheet blank (1) located between punch assembly (17) - die (13) and the clamping member (30), a controlled buckling oriented by a driving action on the peripheral part of the sheet blank (1), while maintaining a substantially constant thickness and perimeter sheet metal blank,
- and simultaneously apply and unroll the peripheral zone 1b of the sheet blank (1) along the side walls of the punch (17) or of the die (13), by a relative movement of the clamping member (30) relative to the punch (17) or to the die (13) to obtain the final fallen edge. 2. Procédé selon la revendication 1, caractérisé en ce qu'au cours du flambage de la partie libre (1b) du flan de tôle (1), on oriente la déformation de ladite partie libre.2. Method according to claim 1, characterized in that during the buckling of the free part (1b) of the sheet blank (1), the deformation of said free part is oriented. 3. Dispositif de formage d'un flan de tôle (1), notamment pour réaliser un masque de tube cathodique, sur une presse recevant une matrice (13) et un poinçon (17) supporté par une semelle supérieure (19) par l'intermédiaire d'une semelle intermédiaire (18), caractérisé en ce que la matrice (13) et le poinçon (17) sont réalisés en un matériau déformable et en ce qu'il comporte un organe de serrage (30) de la périphérie du flan de tôle (1), des moyens (23) pour exercer dans des zones localisées une action mécanique sur l'organe de serrage (30) en rapprochant les éléments opposés de l'organe de serrage (30), des moyens (23, 42, 43) de déplacement vertical de l'organe de serrage (30) par rapport à l'ensemble poinçon (17) - matrice (13) et des moyens complémentaires (50) pour contrôler le flambage et dérouler la partie périphérique du flan de tôle le long des parois latérales du poinçon (17) ou de la matrice (13) afin d'obtenir le bord tombé final.3. Device for forming a sheet blank (1), in particular for producing a cathode ray tube mask, on a press receiving a die (13) and a punch (17) supported by an upper sole (19) by the intermediate of an intermediate sole (18), characterized in that the matrix (13) and the punch (17) are made of a deformable material and in that it comprises a clamping member (30) of the periphery of the blank sheet metal (1), means (23) for exerting in localized areas a mechanical action on the clamping member (30) by bringing the opposite elements of the clamping member (30), means (23, 42 , 43) of vertical displacement of the clamping member (30) relative to the punch assembly (17) - die (13) and complementary means (50) for controlling the buckling and unwinding the peripheral part of the sheet blank along the side walls of the punch (17) or of the die (13) in order to obtain the final fallen edge. 4. Dispositif selon la revendication 3, caractérisé en ce que l'organe de serrage périphérique (30) du flan de tôle (1) a la forme d'un cadre.4. Device according to claim 3, characterized in that the peripheral clamping member (30) of the sheet blank (1) has the shape of a frame. 5. Dispositif selon les revendications 3 et 4, caractérisé en ce que l'organe de serrage périphé­rique (30) est constitué d'une pince supérieure (31) supportée par la semelle intermédiairen (18) et d'une pince inférieure (32).5. Device according to claims 3 and 4, characterized in that the peripheral clamping member (30) consists of an upper clamp (31) supported by the midsole (18) and a lower clip (32). 6. Dispositif selon la revendication 5, caractérisé en ce que la pince inférieure (32) est munie au niveau de son arête périphérique supérieure d'une face inclinée (31c).6. Device according to claim 5, characterized in that the lower clamp (32) is provided at its upper peripheral edge with an inclined face (31c). 7. Dispositif selon l'une des revendications 3 à 6, caractérisé en ce que les moyens pour exercer dans des zones localisées une action mécanique sur l'organe de serrage (30) sont constitués par des cames (23) supportées par la semelle supérieure (19).7. Device according to one of claims 3 to 6, characterized in that the means for exerting in localized areas a mechanical action on the clamping member (30) consist of cams (23) supported by the upper sole (19). 8. Dispositif selon la revendication 7, caractérisé en ce que les cames (23) comportent une face inférieure inclinée (23a) et un dégagement (23b) muni d'une face inclinée (23c) coopérant avec la face inclinée (31c) de la pince (31).8. Device according to claim 7, characterized in that the cams (23) have an inclined lower face (23a) and a clearance (23b) provided with an inclined face (23c) cooperating with the inclined face (31c) of the pliers (31). 9. Dispositif selon l'une des revendications 3 à 8, caractérisé en ce que les moyens de déplacement vertical de l'organe de serrage (30) sont constitués par des contre-cames (43) coopérant avec les cames (23) et un cadre (42) interposé entre lesdites contre-­cames (43) et ledit organe de serrage (30).9. Device according to one of claims 3 to 8, characterized in that the means for vertical displacement of the clamping member (30) are constituted by counter-cams (43) cooperating with the cams (23) and a frame (42) interposed between said cams (43) and said clamping member (30). 10. Dispositif selon la revendication 9, caractérisé en ce que les contre-cames (43) sont mobiles dans une direction perpendiculaire à la direction de déplacement des cames (23).10. Device according to claim 9, characterized in that the cams (43) are movable in a direction perpendicular to the direction of movement of the cams (23). 11. Dispositif selon les revendications 9 et 10, caractérisé en ce que les contre-cames (43) comportent sur leur paroi supérieure une succession de plusieurs faces inclinées (43a, 43b, 43c) d'orienta­tion et de pentes différentes.11. Device according to claims 9 and 10, characterized in that the cams (43) have on their upper wall a succession of several inclined faces (43a, 43b, 43c) of orientation and different slopes. 12. Dispositif selon la revendication 9, caractérisé en ce que le cadre (42) est muni au niveau de son arête périphérique extérieure d'une face inclinée (42a) de même pente que la face inclinée (43b) des contre-cames (43).12. Device according to claim 9, characterized in that the frame (42) is provided at its outer peripheral edge with a face inclined (42a) of the same slope as the inclined face (43b) of the cams (43). 13. Dispositif selon l'une des revendica­tions 3 à 12, caractérisé en ce que les moyens complémentaires pour contrôler le flambage de la partie périphérique (1b) du flan de tôle (1) sont constitués par une lame périphérique déformable (50).13. Device according to one of claims 3 to 12, characterized in that the complementary means for controlling the buckling of the peripheral part (1b) of the sheet blank (1) consist of a deformable peripheral blade (50). 14. Dispositif selon l'une des revendica­tions 3 à 13, caractérisé en ce que la lame périphé­rique déformable (50) est constituée par un élément élastique dont une première partie (50a) est en appui sur l'ensemble poinçon (17) - matrice (13) et dont une deuxième partie (50b) est en appui sur l'organe de serrage (30).14. Device according to one of claims 3 to 13, characterized in that the deformable peripheral blade (50) is constituted by an elastic element of which a first part (50a) is supported on the punch assembly (17) - die (13) and a second part (50b) of which rests on the clamping member (30). 15. Dispositif selon la revendication 14, caractérisé en ce que la première partie (50a) de la lame (50) repose sur un support (51) en forme de cadre.15. Device according to claim 14, characterized in that the first part (50a) of the blade (50) rests on a support (51) in the form of a frame. 16. Dispositif selon la revendication 15, caractérisé en ce que le support (51) comporte une plaque de paroi (50a) verticale et une plaque de base (51b) horizontale contiguë à un bord de ladite plaque de paroi en faisant un angle droit avec celle-ci.16. Device according to claim 15, characterized in that the support (51) comprises a vertical wall plate (50a) and a horizontal base plate (51b) contiguous to an edge of said wall plate at a right angle with this one. 17. Dispositif selon la revendication 16, caractérisé en ce que la plaque de base (51b) a une face inférieure (51c) inclinée sensiblement selon la même pente que la face inclinée (43c) des contre-cames (43).17. Device according to claim 16, characterized in that the base plate (51b) has a lower face (51c) inclined substantially along the same slope as the inclined face (43c) of the cams (43). 18. Dispositif selon l'une des revendica­tions 14 à 17, caractérisé en ce que la deuxième partie (50b) de la lame (50) est en appui sur un poussoir (52) formé par une plaque verticale dont l'extrémité inférieure repose sur la plaque de base (51b) du support (51).18. Device according to one of claims 14 to 17, characterized in that the second part (50b) of the blade (50) is supported on a pusher (52) formed by a vertical plate whose lower end rests on the base plate (51b) of the support (51). 19. Dispositif selon l'une des revendica­tions 14 à 18, caractérisé en ce que des ressorts (53) sont disposés entre la plaque de paroi (51a) du support (51) et le poussoir (52).19. Device according to one of claims 14 to 18, characterized in that springs (53) are arranged between the wall plate (51a) of the support (51) and the pusher (52). 20. Dispositif selon la revendication 3, caractérisé en ce qu'il comporte des moyens (15, 16) pour verrouiller la matrice (13) au point mort bas.20. Device according to claim 3, characterized in that it comprises means (15, 16) for locking the matrix (13) at bottom dead center. 21. Masque de tube cathodique, caractérisé en ce qu'il est réalisé selon l'une quelconque des revendications 1 et 2.21. Cathode ray tube mask, characterized in that it is produced according to any one of claims 1 and 2.
EP89402656A 1988-10-05 1989-09-27 Method and device for shaping sheet metal, particularly for realizing a shadow mask for cathode ray tubes obtained according to the method Expired - Lifetime EP0367642B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT89402656T ATE88384T1 (en) 1988-10-05 1989-09-27 METHOD AND DEVICE FOR SHAPING SHEET METAL, IN PARTICULAR FOR REALIZING A PERFORATED MASK FOR CATHODE RAY TUBES ACCORDING TO THE METHOD.

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
FR8813042 1988-10-05
FR8813042A FR2637207B1 (en) 1988-10-05 1988-10-05 METHOD AND DEVICE FOR FORMING A SHEET OF METAL PARTICULARLY FOR PRODUCING A CATHODE RAY MASK AND CATHODE RAY MASK OBTAINED ACCORDING TO THIS METHOD
FR8900545 1989-01-18
FR8900545A FR2641720B1 (en) 1989-01-18 1989-01-18 METHOD AND DEVICE FOR FORMING A SHEET OF METAL PARTICULARLY FOR PRODUCING A CATHODE RAY MASK AND CATHODE RAY MASK OBTAINED ACCORDING TO THIS METHOD

Publications (2)

Publication Number Publication Date
EP0367642A1 true EP0367642A1 (en) 1990-05-09
EP0367642B1 EP0367642B1 (en) 1993-04-21

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Application Number Title Priority Date Filing Date
EP89402656A Expired - Lifetime EP0367642B1 (en) 1988-10-05 1989-09-27 Method and device for shaping sheet metal, particularly for realizing a shadow mask for cathode ray tubes obtained according to the method

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US (1) US5005396A (en)
EP (1) EP0367642B1 (en)
JP (1) JPH02148641A (en)
KR (1) KR900007024A (en)
CN (1) CN1024506C (en)
CA (1) CA2000059A1 (en)
DE (1) DE68906123T2 (en)
ES (1) ES2042037T3 (en)
FI (1) FI102793B1 (en)

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Also Published As

Publication number Publication date
DE68906123D1 (en) 1993-05-27
FI102793B (en) 1999-02-15
FI894696A0 (en) 1989-10-04
CN1024506C (en) 1994-05-18
CN1041549A (en) 1990-04-25
JPH02148641A (en) 1990-06-07
FI102793B1 (en) 1999-02-15
CA2000059A1 (en) 1990-04-05
FI894696A (en) 1990-04-06
US5005396A (en) 1991-04-09
EP0367642B1 (en) 1993-04-21
DE68906123T2 (en) 1993-12-02
KR900007024A (en) 1990-05-09
ES2042037T3 (en) 1993-12-01

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