EP1002597B1 - Container seaming control cam with deformation gauges - Google Patents

Container seaming control cam with deformation gauges Download PDF

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Publication number
EP1002597B1
EP1002597B1 EP99402774A EP99402774A EP1002597B1 EP 1002597 B1 EP1002597 B1 EP 1002597B1 EP 99402774 A EP99402774 A EP 99402774A EP 99402774 A EP99402774 A EP 99402774A EP 1002597 B1 EP1002597 B1 EP 1002597B1
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EP
European Patent Office
Prior art keywords
cam
length
profile
gauges
produce
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Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
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EP99402774A
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German (de)
French (fr)
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EP1002597A1 (en
Inventor
Raymond Buisson
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Centre Technique des Industries Mecaniques CETIM
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Centre Technique des Industries Mecaniques CETIM
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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
    • B21D51/00—Making hollow objects
    • B21D51/16—Making hollow objects characterised by the use of the objects
    • B21D51/26—Making hollow objects characterised by the use of the objects cans or tins; Closing same in a permanent manner
    • B21D51/30—Folding the circumferential seam
    • B21D51/32—Folding the circumferential seam by rolling

Definitions

  • the present invention relates to crimping containers such as cans or analogous, by means of a seamer in which application of the tool (usually a crimping wheel) on the lip to be crimped controlled by the rolling of a roller on a cam formed of a crown on an active sector of which is externally formed a profile of upward ramp and downward ramp.
  • the tool usually a crimping wheel
  • the manufacture and / or use of boxes can requires one or two operations of setting of the funds.
  • the tightness of a box closed depends on the existing tightening inside crimped edges.
  • the object of the invention is to remedy this default and suggest a cam modification allowing to have a response substantially uniform over the entire length of the game sensitive, i.e. a response whose rate of non-uniformity is less than 10%.
  • this object is achieved when 0.75 ⁇ Lr / Ls ⁇ 0.80 where Lr and Ls respectively denote the length of the rigid part located in the center of the machined part and the length of the sensitive part of the cam.
  • Ls is equal to the length of the cam profile which corresponds to one revolution of the box during crimping;
  • Lr is the equivalent rigid length of the measurement area on the cam profile. It is a length which is a little longer than the length of the cam profile part which has a height hr (see below) in order to take account of the influence of the connection zone between the rigid part and the thinned part.
  • Figures 1 and 2 show all of control 1 consisting of two superimposed cams 2 and 3, respectively first and second surgery.
  • a wheel mounted at the end of an arm linked to a tree swivel definitively crimp the lip of crimping the bottom of the box;
  • a mounted roller rotatable at the end of another arm linked to the shaft rolls on cam 3 and thus controls the pivoting of the shaft and therefore the force application of the crimping wheel.
  • cam 3 has an active region 4 in which is formed, on the cylindrical periphery of cam 3, a useful profile, composed for example an ascending ramp 5 followed by a plateau 6 and of a descending ramp 7.
  • Cam 3 is under shape of a thick ring with two annular faces planar.
  • the tray is at a height hr by relative to the inner periphery 9 of the cam.
  • active region 4 we machined, for example by EDM, two notches 8 from of the inner periphery 9 of the cam and delimiting between them a sensitive part of length Ls, over which the measurement of the force applied by the cam on the roller.
  • Each notch is formed by a radial plane 10 and by a concave curved portion 11 connecting the bottom of notch 8 at the central inner periphery 12 not machined between the two notches.
  • the bottom of the notch leaves a thickness hs of material in the thinnest area.
  • the machined length between the radial planes 10 is called Lu.
  • the two indentations 8 separate a central area rigid 13 of length Lr. Gauges of unrepresented constraints are pasted in notches, and are connected to a device of analysis giving a signal representative of the force of the cam on the roller.
  • hs The value of hs is determined so that have a level of mechanical deformation allowing optimal operation of the gauges mechanical deformations stuck inside the modified area. In practice, this value is determined by doing a behavior calculation mechanics of the sensitive part so that the stresses and mechanical deformations are acceptable and are not likely to lead to fatigue damage but on the other hand are high enough to obtain a usable electrical measurement signal by the measurement system.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Transmission Devices (AREA)
  • Auxiliary Devices For And Details Of Packaging Control (AREA)
  • Coupling Device And Connection With Printed Circuit (AREA)
  • Piezo-Electric Or Mechanical Vibrators, Or Delay Or Filter Circuits (AREA)
  • Cartons (AREA)
  • Bending Of Plates, Rods, And Pipes (AREA)
  • Shaping Metal By Deep-Drawing, Or The Like (AREA)

Abstract

The active sector (4) of the container crimping cam (3) has an internal profile defining a flat zone (12) between two deep indentations (8) receiving deformation gages. The gauges are used to produce a signal controlling the cam force. The signals from the gages are processed by an analysis device to produce a signal representative of the force exerted by the cam on the control roller. Lr, Ls and Lu designate the length of the rigid part at the center of the machined part, the length of the sensitive part of the cam and the length of the machine part respectively. hr and hs designate the thickness of the thinned zone and the height of material constituting the cam profile. These distances are related by : 0.75 ≤ Lr/Ls ≤ 0.80 1.75 ≤ Lu/Ls ≤ 1.80 and hr/hs ≥ 3.2

Description

La présente invention concerne le sertissage de conteneurs tels que des boítes de conserve ou analogue, au moyen d'une sertisseuse dans laquelle l'application de l'outil (généralement une molette) de sertissage sur la lèvre à sertir est commandée par le roulement d'un galet sur une came formée d'une couronne sur un secteur actif de laquelle est formé extérieurement un profil de rampe ascendante et de rampe descendante.The present invention relates to crimping containers such as cans or analogous, by means of a seamer in which application of the tool (usually a crimping wheel) on the lip to be crimped controlled by the rolling of a roller on a cam formed of a crown on an active sector of which is externally formed a profile of upward ramp and downward ramp.

La fabrication et/ou l'utilisation de boítes de conserve nécessite une ou deux opérations de sertissage des fonds. L'étanchéité d'une boíte fermée dépend du serrage existant à l'intérieur des bords sertis.The manufacture and / or use of boxes can requires one or two operations of setting of the funds. The tightness of a box closed depends on the existing tightening inside crimped edges.

Sur les sertisseuses en deux passes, ce serrage est intimement lié à l'effort appliqué sur les tôles de la boíte et du fond au moment de la deuxième passe. Le document US 4205617 A fait connaítre une technique de contrôle de la qualité du sertissage en mesurant en temps réel l'effort appliqué par la came sur le galet actionnant la molette de sertissage. Cette technique utilise des capteurs d'efforts intégrés à la came et reliés à un circuit approprié de traitement de signal, mais la façon de les intégrer n'est pas décrite, or il y a lieu de penser que la façon d'implanter les capteurs influence grandement les résultats des mesures et leur fiabilité.On two pass seamers, this tightening is intimately linked to the force applied to the sheets of the box and the bottom at the time of second pass. Document US 4205617 has made know a quality control technique crimping by measuring the force in real time applied by the cam on the roller actuating the crimping wheel. This technique uses force sensors integrated into the cam and connected to an appropriate signal processing circuit but the way to integrate them is not described, but there there is reason to think that the way of installing the sensors greatly influences the results of measures and their reliability.

Il existe sur le marché une came de commande de sertissage en deux passes, dont la came correspondant à la seconde passe comporte dans le secteur actif, intérieurement, un profil (représenté sur la figure 3 ci-jointe) défini par deux échancrures profondes symétriques en coin arrondi dans lesquelles sont disposées des jauges de déformation dont les signaux électriques de sortie sont traités par un dispositif d'analyse pour produire un signal représentatif de l'effort exercé par la came sur le galet, en pratique un signal proportionnel audit effort. A la connaissance de la Demanderesse, ces deux échancrures sont usinées dans l'épaisseur de la came, à l'opposé du profil actif, selon une forme qui n'est définie qu'en fonction des contraintes liées à l'installation des jauges (voir aussi les documents WO-A-98/075 34 et EP-A-0 181 234).There is a control cam on the market crimping in two passes, including the cam corresponding to the second pass features in the active sector, internally, a profile (shown in Figure 3 attached) defined by two symmetrical deep corner notches rounded in which gauges are arranged deformation whose electrical signals from output are processed by an analysis device to produce a signal representative of the effort exerted by the cam on the roller, in practice a signal proportional to said effort. To the knowledge of the Applicant, these two notches are machined in the thickness of the cam, opposite the active profile, in a shape which is only defined according to the constraints related to the installation of gauges (see also documents WO-A-98/075 34 and EP-A-0 181 234).

Les études menées par la Demanderesse ont montré que cette disposition n'est pas pleinement satisfaisante en ce sens que le signal électrique obtenu ne représente pas fidèlement l'effort appliqué par la came pour réaliser le sertissage. Si la modification de la came fait apparaítre comme on s'y attend une partie sensible dans la zone active du profil, il s'avère que lorsqu'un effort constant se déplace d'une extrémité à l'autre de la partie sensible, la réponse du capteur n'est pas constante, contrairement à ce qui est souhaité. Elle est maximale lorsque l'effort est au milieu et minimale lorsqu'il se trouve à l'une des extrémités. Le taux de non-uniformité peut atteindre, voire dépasser 50%, c'est-à-dire que lorsque l'effort est au milieu, la réponse du système peut dépasser le double de ce qu'elle est lorsque l'effort est à l'une des extrémités.The studies carried out by the Applicant have shown that this provision is not fully satisfactory in that the electrical signal obtained does not faithfully represent the effort applied by the cam to achieve crimping. If the modification of the cam shows up as expected a sensitive part in the active area of the profile, it turns out that when constant effort moves from one end to the other of the sensitive part, the response of the sensor is not constant, unlike this which is desired. It is maximum when the effort is in the middle and minimal when it found at one end. The rate of non-uniformity can reach or even exceed 50%, that is to say that when the effort is in the middle, system response may exceed double what it is when the effort is at one of ends.

Le but de l'invention est de remédier à ce défaut et de proposer une modification de came permettant d'avoir une réponse sensiblement uniforme sur toute la longueur de la partie sensible, c'est-à-dire une réponse dont le taux de non-uniformité soit inférieur à 10%.The object of the invention is to remedy this default and suggest a cam modification allowing to have a response substantially uniform over the entire length of the game sensitive, i.e. a response whose rate of non-uniformity is less than 10%.

Selon l'invention, ce but est atteint lorsque 0,75 < Lr/Ls < 0,80 où Lr et Ls désignent respectivement la longueur de la partie rigide se trouvant au centre de la partie usinée et la longueur de la partie sensible de la came. En pratique, Ls est égal à la longueur de profil de came qui correspond à un tour de boíte au cours du sertissage ; Lr est la longueur rigide équivalente de la zone de mesure sur le profil de la came. C'est une longueur qui est un peu plus élevée que la longueur de la partie de profil de came qui a une hauteur hr (voir ci-dessous) afin de tenir compte de l'influence de la zone de raccordement entre la partie rigide et la partie amincie.According to the invention, this object is achieved when 0.75 <Lr / Ls <0.80 where Lr and Ls respectively denote the length of the rigid part located in the center of the machined part and the length of the sensitive part of the cam. In practice, Ls is equal to the length of the cam profile which corresponds to one revolution of the box during crimping; Lr is the equivalent rigid length of the measurement area on the cam profile. It is a length which is a little longer than the length of the cam profile part which has a height hr (see below) in order to take account of the influence of the connection zone between the rigid part and the thinned part.

Avantageusement : 1,75 < Lu/Ls < 1,80 où Lu désigne la longueur de l'usinage effectué pour réaliser les échancrures.Advantageously: 1.75 <Lu / Ls <1.80 where Lu indicates the length of the machining carried out to achieve the notches.

Avantageusement encore : hr/hs > 3,2 où hr et hs désignent respectivement l'épaisseur de la zone amincie et la hauteur de matière constituant le profil de came.Advantageously again: hr / hs> 3.2 where hr and hs respectively denote the thickness of the thinned zone and the height of material constituting the cam profile.

D'autres caractéristiques et avantages de la présente invention ressortiront de la description ci-après d'un exemple de réalisation de l'invention illustré dans les dessins annexés sur lesquels :

  • la figure 1 est une vue de dessus d'une came de commande modifiée conformément à l'invention,
  • la figure 2 est une vue de côté de la came,
  • la figure 3 est une vue de dessus d'une came de l'art antérieur.
Other characteristics and advantages of the present invention will emerge from the description below of an embodiment of the invention illustrated in the appended drawings in which:
  • FIG. 1 is a top view of a control cam modified in accordance with the invention,
  • FIG. 2 is a side view of the cam,
  • Figure 3 is a top view of a cam of the prior art.

Les figures 1 et 2 représentent l'ensemble de commande 1 constitué de deux cames superposées 2 et 3, respectivement de première et de seconde opération. Comme connu en soi, lors de la seconde opération qui intéresse seule l'invention, une molette montée au bout d'un bras lié à un arbre pivotant vient sertir définitivement la lèvre de sertissage du fond de boíte ; un galet monté rotatif au bout d'un autre bras lié à l'arbre roule sur la came 3 et commande ainsi le pivotement de l'arbre et donc la force d'application de la molette de sertissage. A cet effet, la came 3 comporte une région active 4 dans laquelle est formée, sur la périphérie cylindrique de la came 3, un profil utile, composé par exemple d'une rampe ascendante 5 suivie d'un plateau 6 et d'une rampe descendante 7. La came 3 est sous forme d'un anneau épais à deux faces annulaires planes. Le plateau est à une hauteur hr par rapport à la périphérie intérieure 9 de la came. Dans la région active 4, on a usiné, par exemple par électro-érosion, deux échancrures 8 à partir de la périphérie intérieure 9 de la came et délimitant entre elles une partie sensible de longueur Ls, sur laquelle s'effectue la mesure de l'effort appliqué par la came sur le galet. Chaque échancrure est formée par un plan radial 10 et par une partie courbe concave 11 reliant le fond de l'échancrure 8 à la périphérie intérieure centrale 12 non usinée entre les deux échancrures. Le fond de l'échancrure laisse une épaisseur hs de matière dans la zone la plus amincie. La longueur usinée entre les plans radiaux 10 est appelée Lu. Les deux échancrures 8 séparent une zone centrale rigide 13 de longueur Lr. Des jauges de contraintes non représentées sont collées dans les échancrures, et sont reliées à un dispositif d'analyse donnant un signal représentatif de l'effort de la came sur le galet. Ces éléments sont déjà connus de l'homme du métier et ne nécessitent pas de plus amples explications.Figures 1 and 2 show all of control 1 consisting of two superimposed cams 2 and 3, respectively first and second surgery. As known per se, during the second operation which only concerns the invention, a wheel mounted at the end of an arm linked to a tree swivel definitively crimp the lip of crimping the bottom of the box; a mounted roller rotatable at the end of another arm linked to the shaft rolls on cam 3 and thus controls the pivoting of the shaft and therefore the force application of the crimping wheel. In this indeed, cam 3 has an active region 4 in which is formed, on the cylindrical periphery of cam 3, a useful profile, composed for example an ascending ramp 5 followed by a plateau 6 and of a descending ramp 7. Cam 3 is under shape of a thick ring with two annular faces planar. The tray is at a height hr by relative to the inner periphery 9 of the cam. In active region 4, we machined, for example by EDM, two notches 8 from of the inner periphery 9 of the cam and delimiting between them a sensitive part of length Ls, over which the measurement of the force applied by the cam on the roller. Each notch is formed by a radial plane 10 and by a concave curved portion 11 connecting the bottom of notch 8 at the central inner periphery 12 not machined between the two notches. The bottom of the notch leaves a thickness hs of material in the thinnest area. The machined length between the radial planes 10 is called Lu. The two indentations 8 separate a central area rigid 13 of length Lr. Gauges of unrepresented constraints are pasted in notches, and are connected to a device of analysis giving a signal representative of the force of the cam on the roller. These elements are already known to those skilled in the art and do not do not require further explanation.

La Demanderesse a découvert qu'une géométrie particulière des échancrures pouvait améliorer nettement le résultat des mesures.The Applicant has discovered that a geometry particular notches could improve clearly the result of the measurements.

Selon l'invention : (1)   hr/hs > 3,2 (2)   0,75 < Lr/Ls < 0,80 (3)   1,75 < Lu/Ls < 1,80 According to the invention: (1) hr / hs> 3.2 (2) 0.75 <Lr / Ls <0.80 (3) 1.75 <Lu / Ls <1.80

La valeur de hs est déterminée de manière à avoir un niveau de déformation mécanique permettant un fonctionnement optimal des jauges de déformations mécaniques collées à l'intérieur de la zone modifiée. En pratique, cette valeur est déterminée en faisant un calcul du comportement mécanique de la partie sensible de manière que les contraintes et les déformations mécaniques maximales soient acceptables et ne risquent pas de conduire à des endommagements par fatigue mais d'un autre côté soient suffisamment élevées pour obtenir un signal électrique de mesure exploitable par le système de mesure.The value of hs is determined so that have a level of mechanical deformation allowing optimal operation of the gauges mechanical deformations stuck inside the modified area. In practice, this value is determined by doing a behavior calculation mechanics of the sensitive part so that the stresses and mechanical deformations are acceptable and are not likely to lead to fatigue damage but on the other hand are high enough to obtain a usable electrical measurement signal by the measurement system.

Par rapport à l'art antérieur représenté figure 3, on voit que le respect des proportions ci-dessus se traduit notamment par des échancrures 8 moins allongées qu'auparavant, laissant ainsi une partie centrale 12 plus longue.Compared to the prior art shown Figure 3, we see that respecting the proportions above results in particular in notches 8 less elongated than before, thus leaving a longer central portion 12.

Claims (3)

  1. Seaming control cam (3) formed from a ring, on an active sector (4) of which are formed, on the one hand, externally an ascending (5) and a descending (7) ramp profile and, on the other hand, internally a profile defining a plateau zone (12) between two deep indentations (8), in which are arranged deformation gauges, the electrical output signals from which are processed by an analyser in order to generate a signal representing the force exerted by the cam (3) on a control roller which rolls on the latter, characterized in that: 0.75 < Lr/Ls < 0.80 where Lr and Ls designate respectively the length of the rigid part located at the centre of the machined part and the length of the sensitive part of the cam.
  2. Cam according to Claim 1, characterized in that: 1.75 < Lu/Ls < 1.80 where Lu designates the length of the machining carried out in order to produce the indentations.
  3. Cam according to either one of Claims 1 and 2, characterized in that: hr/hs > 3.2 where hr and hs designate respectively the thickness of the thinned zone and the height of material forming the cam profile.
EP99402774A 1998-11-17 1999-11-08 Container seaming control cam with deformation gauges Expired - Lifetime EP1002597B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9814418A FR2785959B1 (en) 1998-11-17 1998-11-17 CONTAINER CRIMPING CAM CAM WITH DEFORMATION GAUGES
FR9814418 1998-11-17

Publications (2)

Publication Number Publication Date
EP1002597A1 EP1002597A1 (en) 2000-05-24
EP1002597B1 true EP1002597B1 (en) 2003-05-28

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EP99402774A Expired - Lifetime EP1002597B1 (en) 1998-11-17 1999-11-08 Container seaming control cam with deformation gauges

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EP (1) EP1002597B1 (en)
JP (1) JP4261003B2 (en)
AT (1) ATE241438T1 (en)
DE (1) DE69908281T2 (en)
FR (1) FR2785959B1 (en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2817180B1 (en) * 2000-11-30 2003-01-24 Ct Tech Des Ind Mecaniques CRIMPING HEAD FOR FORM BOXES
JP4735083B2 (en) * 2005-07-05 2011-07-27 日産自動車株式会社 Can winding device and can winding method

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4205617A (en) * 1978-10-23 1980-06-03 The Continental Group, Inc. Double seam tightness control
US4606205A (en) * 1984-11-09 1986-08-19 Continental Can Company, Inc. Applied force monitor for apparatus for forming products from sheet material
US6623230B1 (en) * 1996-08-21 2003-09-23 Pneumatic Scale Corporation Can seam forming apparatus

Also Published As

Publication number Publication date
JP2000153331A (en) 2000-06-06
FR2785959B1 (en) 2001-02-02
FR2785959A1 (en) 2000-05-19
ATE241438T1 (en) 2003-06-15
DE69908281T2 (en) 2004-03-25
EP1002597A1 (en) 2000-05-24
DE69908281D1 (en) 2003-07-03
JP4261003B2 (en) 2009-04-30

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