EP2165810B1 - Cutting blade for hollow profiles with at least one projecting element that is retractable in the blade and a device with such a blade - Google Patents

Cutting blade for hollow profiles with at least one projecting element that is retractable in the blade and a device with such a blade Download PDF

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Publication number
EP2165810B1
EP2165810B1 EP20090305847 EP09305847A EP2165810B1 EP 2165810 B1 EP2165810 B1 EP 2165810B1 EP 20090305847 EP20090305847 EP 20090305847 EP 09305847 A EP09305847 A EP 09305847A EP 2165810 B1 EP2165810 B1 EP 2165810B1
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EP
European Patent Office
Prior art keywords
blade
cutting
cutting blade
thickness
catch
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Not-in-force
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EP20090305847
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German (de)
French (fr)
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EP2165810A1 (en
Inventor
Joël ETIENNE
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Numalliance SAS
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Numalliance SAS
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B26—HAND CUTTING TOOLS; CUTTING; SEVERING
    • B26D—CUTTING; DETAILS COMMON TO MACHINES FOR PERFORATING, PUNCHING, CUTTING-OUT, STAMPING-OUT OR SEVERING
    • B26D1/00—Cutting through work characterised by the nature or movement of the cutting member or particular materials not otherwise provided for; Apparatus or machines therefor; Cutting members therefor
    • B26D1/0006—Cutting members therefor
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B26—HAND CUTTING TOOLS; CUTTING; SEVERING
    • B26D—CUTTING; DETAILS COMMON TO MACHINES FOR PERFORATING, PUNCHING, CUTTING-OUT, STAMPING-OUT OR SEVERING
    • B26D3/00—Cutting work characterised by the nature of the cut made; Apparatus therefor
    • B26D3/16—Cutting rods or tubes transversely
    • B26D3/169—Hand held tube cutters
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B26—HAND CUTTING TOOLS; CUTTING; SEVERING
    • B26D—CUTTING; DETAILS COMMON TO MACHINES FOR PERFORATING, PUNCHING, CUTTING-OUT, STAMPING-OUT OR SEVERING
    • B26D1/00—Cutting through work characterised by the nature or movement of the cutting member or particular materials not otherwise provided for; Apparatus or machines therefor; Cutting members therefor
    • B26D1/0006—Cutting members therefor
    • B26D2001/0053—Cutting members therefor having a special cutting edge section or blade section
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B26—HAND CUTTING TOOLS; CUTTING; SEVERING
    • B26D—CUTTING; DETAILS COMMON TO MACHINES FOR PERFORATING, PUNCHING, CUTTING-OUT, STAMPING-OUT OR SEVERING
    • B26D1/00—Cutting through work characterised by the nature or movement of the cutting member or particular materials not otherwise provided for; Apparatus or machines therefor; Cutting members therefor
    • B26D1/0006—Cutting members therefor
    • B26D2001/006—Cutting members therefor the cutting blade having a special shape, e.g. a special outline, serrations

Definitions

  • the present invention relates to a cutting blade for a machine for cutting tubes or other hollow sections and a machine equipped with said cutting blade.
  • the problem to be solved is the deformation of the profiles during a transverse cutting thereof.
  • the state of the art teaches a solution to this problem by means of machines equipped with two cutting blades perpendicularly crossed movements and operating as follows: the section is firmly maintained, a first blade arase a rope (or two diametrically opposite ropes) the tube or profile to a depth corresponding to its thickness, then the second blade is introduced perpendicular to the first in the manner of a dagger, the tip coinciding with the ash of the straightened cord; the second blade makes a stroke such that the section to be cut is completely covered by its own profile; the two parts of tube or hollow profile are then separated.
  • the section cut is practically not deformed but the machine requires a complex and expensive mechanics and the operation time is long.
  • This technique consists in using only one blade directly inserted transversely in the section firmly held. The blade performs a stroke such that the section to be cut is completely covered by the profile of the blade.
  • the result on the section cut is a localized deformation at the point of introduction of the blade, deformation creating a reduction of the inner section, often unacceptable for applications of parts or subsequent shaping operations.
  • This deformation is related to the mechanical characteristics of the cut material, its maintenance in the tools, the profile of the tip of the blade and its wear.
  • This deformation often requires an additional operation of recalibration of the cut section whose cost is added to that of the cutting operation.
  • the invention solves the problem of the deformation generated by the single cutting blade technique and eliminates the additional recalibration operation.
  • the general inventive idea of the cutting blade being to present at least one projecting element on one of the faces of the blade and completely erasable in the cutting blade under the effect of external pressures due to the forces generated by the passage in a slit of the profile created by the section and which automatically returns to its initial position when these efforts are canceled.
  • the blade comprises a projecting element on each of its faces.
  • the projecting element or elements are integral with a cleat inserted in a cutout of the blade.
  • a cleat is inserted into the cutting blade and comprises a base whose thickness and at most equal to the thickness of the blade in which it is inserted, base extended by an elastically deformable portion so as to present a thickness (e) greater than that of the blade, thickness that can be reduced under the effect of external stress and can return to its initial value (e) by elasticity; the base being placed towards the tip of the blade and the deformable portion being placed towards the opposite edge of said blade or vice versa.
  • the base could be shortened or removed but it is better to maintain it because it helps to facilitate the entry of the blade and the cleat during the cutting sequence.
  • a classic blade is like the patent DE 3 626 323 C1 , on which the preamble is based.
  • the invention consists in equipping a conventional blade, for example a blade having the profile shown in FIG. figure 1 , an elastic cleat (1) inserted in a cutout (2) made in a blade (3), the orifices of the referenced blade (4) serving for fixing the blade on the mechanical drive means of a machine.
  • the cutout (2) has a shape in two substantially rectangular parts and is centered on the axis of symmetry (5) of said blade.
  • a first portion (2a) rectangular is intended to receive the base of the cleat, it is closed towards the tip (3a) of the blade and it is open and opening on the other side on a second portion (2b) wider.
  • a cleat (1) is a part preferably steel formed of a base (1a) extended by two wings (1b) and (1 c) spring effect.
  • the two wings (1b) and (1c) form, seen in section along AA, a V-shaped profile whose tip (1d) starts from the base (1a) and whose ends (1e; 1f) are distant from each other. of each other and can be brought closer under the effect of external constraints and can return to the initial state by the elasticity as it is visible on the figure 3 , the thickness of the portion (1a) is identical to the thickness of the cutting blade (3), or lower so as not to hinder the entry of the blade in a tube or profile (6).
  • the gap between the ends (1e) and (1f) of the wings is greater than the thickness of the blade, of the order of 1 mm for the embodiment.
  • the total length (1) of the cleat is less than the total length (L) of the blade.
  • the end (1e or 1f) of a wing is shaped in a shape complementary to that of the tube to be cut, namely shaped in an arc to cut a circular tube (case of figures 4 ) or flat to cut a tube with rectangular section (case of the figure 2 ).
  • a cleat (10) is a piece composed of two adjacent tabs (10c; 10b) and parallel each terminated on the one hand “attachment side” by a projecting heel (10a) and on the other hand “ next to the tube "by a protruding lug (10e).
  • FIG. 10 shows the profile of a tongue (10b) inserted into a cutting blade blank 3 of the same type as that of Figures 2 to 4 so as to be completely embedded in the blade except for the projecting heel (10a) and used for holding by the blade fasteners (not shown) and a bevel (10e) beveled and whose edge interior (11) is shaped in an arc or flat according to the shape of the tube to be straightened.
  • the thickness of the tongue (10b) decreases towards the lug (10e) so that, during the straightening of the tube, the lug (10e) disappears into the cutting blade without exceeding the lug. other face of said blade.
  • the bevelled portion (3c) of the cutout (2) of the blade serves as a stop when returning the tongue (10b) after cutting and before straightening the tube.
  • the tongue (10c) is identical to the tongue (10b) but in the reverse position relative to the cutting blade so as to have a lug (10f) projecting from the other face of the blade as shown by the Figures 7, 5, 9 .
  • the cleat (10) could alternatively be made in one piece cut longitudinally and part of its length in two tongues such as (10e; 10f).
  • a tongue may be inserted into a slot-shaped cutout opening on only one face of the cutting blade.
  • sequences of a cutting cycle are implemented in a numerically controlled machine which controls a carriage on which is fixed the single cutting blade according to the invention.
  • the numerical control makes it possible to control in a simple way the forward and reverse travel of said carriage according to the relative dimensions of the cleat and the profile so as to release the wings of the cleat before the retreat of the blade in order to push back the deformed section of the profile.
  • the same machine may possibly comprise several cutting stations, each equipped with a blade according to the invention.
  • Any other device can be considered to obtain the same result as for example dual-actuator device all or nothing (2 cylinders for example) connected in series.
  • the spacing of the two wings of the cleat can be achieved by other arrangements such as, for example, an elastic element or a reported actuator.
  • the embodiments of the cleat shown in the figures are not limiting and may have variants without departing from the scope of the invention.
  • the general inventive idea of the cleat being to present a base whose thickness and at most equal to the thickness of the blade in which it is inserted, base extended by an elastically deformable portion so as to have a thickness (e) greater to that of the blade, thickness that can be reduced under the effect of external stresses and can return to its initial value (e) by elasticity; the base being placed towards the tip of the blade and the deformable portion being placed towards the opposite edge of said blade.
  • the base could be shortened or removed but it is better to maintain it because it helps to facilitate the entry of the blade and the cleat during the cutting sequence.

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  • Life Sciences & Earth Sciences (AREA)
  • Forests & Forestry (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Nonmetal Cutting Devices (AREA)
  • Knives (AREA)

Description

La présente invention concerne une lame de coupe pour une machine de coupe de tubes ou autres profilés creux et une machine équipée de ladite lame de coupe.The present invention relates to a cutting blade for a machine for cutting tubes or other hollow sections and a machine equipped with said cutting blade.

Le problème à résoudre est la déformation des profilés lors d'une découpe transversale de celui-ci.The problem to be solved is the deformation of the profiles during a transverse cutting thereof.

L'état de la technique enseigne une solution à ce problème au moyen de machines équipées de deux lames de coupe à mouvements croisés perpendiculairement et fonctionnant comme suit : le profilé est fermement maintenu, une première lame arase une corde (ou deux cordes diamétralement opposées) du tube ou du profilé sur une profondeur correspondant à son épaisseur, puis la seconde lame est introduite perpendiculairement à la première à la manière d'un poignard, la pointe coïncidant avec le cendre de la corde arasée ; la seconde lame réalise une course telle que la section à couper soit totalement couverte par son propre profil ; les deux parties de tube ou profilé creux sont alors séparées.The state of the art teaches a solution to this problem by means of machines equipped with two cutting blades perpendicularly crossed movements and operating as follows: the section is firmly maintained, a first blade arase a rope (or two diametrically opposite ropes) the tube or profile to a depth corresponding to its thickness, then the second blade is introduced perpendicular to the first in the manner of a dagger, the tip coinciding with the ash of the straightened cord; the second blade makes a stroke such that the section to be cut is completely covered by its own profile; the two parts of tube or hollow profile are then separated.

La section coupée n'est pratiquement pas déformée mais la machine nécessite une mécanique complexe et onéreuse et le temps d'opération est long.The section cut is practically not deformed but the machine requires a complex and expensive mechanics and the operation time is long.

Afin d'apporter une solution plus économique au problème, la demanderesse a cherché à améliorer la technique à lame de coupe unique dont la mécanique est plus simple et plus rapide, et donc de mise en oeuvre moins onéreuse.In order to provide a more economical solution to the problem, the Applicant has sought to improve the single blade cutting technique whose mechanics are simpler and faster, and therefore less expensive to implement.

Cette technique consiste à n'utiliser qu'une seule lame directement enfoncée transversalement dans le profilé fermement maintenu. La lame réalise une course telle que la section à couper soit totalement couverte par le profil de la lame.This technique consists in using only one blade directly inserted transversely in the section firmly held. The blade performs a stroke such that the section to be cut is completely covered by the profile of the blade.

Le résultat sur la section coupée est une déformation localisée au point d'introduction de la lame, déformation créant une réduction de la section intérieure, souvent rédhibitoire pour les applications des pièces ou les opérations de façonnage suivantes.The result on the section cut is a localized deformation at the point of introduction of the blade, deformation creating a reduction of the inner section, often unacceptable for applications of parts or subsequent shaping operations.

Cette déformation est liée aux caractéristiques mécaniques de la matière coupée, à son maintien dans les outils, au profil de la pointe de la lame et à son usure.This deformation is related to the mechanical characteristics of the cut material, its maintenance in the tools, the profile of the tip of the blade and its wear.

Cette déformation requiert souvent une opération supplémentaire de recalibrage de la section coupée dont le coût s'additionne à celui de l'opération de coupe.This deformation often requires an additional operation of recalibration of the cut section whose cost is added to that of the cutting operation.

L'invention résout le problème de la déformation générée par la technique à lame de coupe unique et supprime l'opération supplémentaire de recalibrage.The invention solves the problem of the deformation generated by the single cutting blade technique and eliminates the additional recalibration operation.

L'idée générale inventive de la lame de coupe étant de présenter au moins un élément en saillie sur une des faces de la lame et complètement effaçable dans la lame de coupe sous l'effet de pressions extérieures dues aux efforts générés par le passage dans une fente du profilé créée par la coupe et qui revient automatiquement à sa position initiale lorsque ces efforts sont annulés.The general inventive idea of the cutting blade being to present at least one projecting element on one of the faces of the blade and completely erasable in the cutting blade under the effect of external pressures due to the forces generated by the passage in a slit of the profile created by the section and which automatically returns to its initial position when these efforts are canceled.

Préférentiellement la lame comporte un élément en saillie sur chacune de ses faces.Preferably the blade comprises a projecting element on each of its faces.

Préférentiellement le ou les éléments en saillie sont solidaires d'un taquet inséré dans une découpe de la lame.Preferably, the projecting element or elements are integral with a cleat inserted in a cutout of the blade.

Selon un mode de réalisation un taquet est inséré dans la lame de coupe et comporte une base dont l'épaisseur et au plus égale à l'épaisseur de la lame dans laquelle elle est insérée, base prolongée par une partie déformable élastiquement de façon à présenter une épaisseur (e) supérieure à celle de la lame, épaisseur pouvant être réduite sous l'effet de contrainte extérieures et pouvant revenir à sa valeur initiale (e) par élasticité ; la base étant placée vers la pointe de la lame et la partie déformable étant placée vers le bord opposé de ladite lame ou inversement. La base pourrait être raccourcie voir supprimée mais il est préférable de la maintenir car elle contribue à faciliter l'entrée de la lame et du taquet lors de la séquence de coupe.According to one embodiment a cleat is inserted into the cutting blade and comprises a base whose thickness and at most equal to the thickness of the blade in which it is inserted, base extended by an elastically deformable portion so as to present a thickness (e) greater than that of the blade, thickness that can be reduced under the effect of external stress and can return to its initial value (e) by elasticity; the base being placed towards the tip of the blade and the deformable portion being placed towards the opposite edge of said blade or vice versa. The base could be shortened or removed but it is better to maintain it because it helps to facilitate the entry of the blade and the cleat during the cutting sequence.

On comprendra mieux l'invention à l'aide de la description ci-après faite en référence aux figures annexées suivantes :

  • figure 1 : vue en plan d'une lame de coupe de l'art antérieur.
  • figure 2 : vue en plan d'une lame selon l'invention équipée d'un taquet élastique, selon un mode de réalisation non limitatif.
  • figure 3 : vue montrant le déplacement d'une lame de coupe selon l'invention pendant un cycle de coupe, le tube et la lame étant vues en coupe selon un plan de coupe AA perpendiculaire au plan de la lame et passant par un axe de symétrie.
  • figure 4 : vues en 3 D des mouvements de coupe et de retrait d'une lame dans un tube au cours d'un cycle.
  • figure 5 : vue en plan d'un autre mode de réalisation de l'invention montrant une lame de coupe avant son retrait d'un tube cylindrique, tube qu'elle vient de couper.
  • figure 6 : vue de gauche de la figure 5.
  • figure 7 : vue en coupe selon CC de la figure 5.
  • figure 8 : vue en coupe selon BB de la figure 5.
  • figure 9 : vue en 3 D des éléments de la figure 5.
The invention will be better understood from the following description given with reference to the following appended figures:
  • figure 1 : plan view of a cutting blade of the prior art.
  • figure 2 : Plan view of a blade according to the invention equipped with an elastic cleat, according to a non-limiting embodiment.
  • figure 3 : A view showing the displacement of a cutting blade according to the invention during a cutting cycle, the tube and the blade being seen in section along a cutting plane AA perpendicular to the plane of the blade and passing through an axis of symmetry.
  • figure 4 : 3D views of the movements of cutting and removing a slide in a tube during a cycle.
  • figure 5 : Plan view of another embodiment of the invention showing a cutting blade before removal from a cylindrical tube, tube she has just cut.
  • figure 6 : left view of the figure 5 .
  • figure 7 : sectional view according to CC of the figure 5 .
  • figure 8 : sectional view according to BB of the figure 5 .
  • figure 9 : view in 3 D of the elements of the figure 5 .

Une lame classique est comme du brevet DE 3 626 323 C1 , sur lequel le préambule se base.A classic blade is like the patent DE 3 626 323 C1 , on which the preamble is based.

L'invention consiste à équiper une lame classique, par exemple une lame ayant le profil représenté en figure 1, d'un taquet élastique (1) inséré dans une découpe (2) pratiquée dans une lame (3), les orifices de la lames référencés (4) servant à la fixation de la lame sur les moyens mécaniques d'entraînement d'une machine.The invention consists in equipping a conventional blade, for example a blade having the profile shown in FIG. figure 1 , an elastic cleat (1) inserted in a cutout (2) made in a blade (3), the orifices of the referenced blade (4) serving for fixing the blade on the mechanical drive means of a machine.

Selon le mode de réalisation non limitatif des figures 2 à 4, la découpe (2) présente une forme en deux parties sensiblement rectangulaires et elle est centrée sur l'axe de symétrie (5) de ladite lame.According to the non-limiting embodiment of Figures 2 to 4 , the cutout (2) has a shape in two substantially rectangular parts and is centered on the axis of symmetry (5) of said blade.

Une première partie (2a) rectangulaire est destinée à recevoir la base du taquet, elle est fermée vers la pointe (3a) de la lame et elle est ouverte et débouchante de l'autre côté sur une deuxième partie (2b) plus large.A first portion (2a) rectangular is intended to receive the base of the cleat, it is closed towards the tip (3a) of the blade and it is open and opening on the other side on a second portion (2b) wider.

Un taquet (1) est une pièce préférentiellement en acier formé d'une base (1a) prolongée par deux ailes (1 b) et (1 c) à effet ressort.A cleat (1) is a part preferably steel formed of a base (1a) extended by two wings (1b) and (1 c) spring effect.

Le deux ailes (1 b) et (1 c) forment, vues en coupe selon AA, un profil en V dont la pointe (1d) part de la base (1a) et dont les extrémités (1e; 1 f) sont distantes l'une de l'autre et peuvent être rapprochées sous l'effet de contraintes extérieures et peuvent revenir à l'état initial par l'élasticité comme cela est visible sur la figure 3, l'épaisseur de la partie (1a) est identique à l'épaisseur de la lame de coupe (3), voire inférieure pour ne pas gêner l'entrée de la lame dans un tube ou un profilé (6).The two wings (1b) and (1c) form, seen in section along AA, a V-shaped profile whose tip (1d) starts from the base (1a) and whose ends (1e; 1f) are distant from each other. of each other and can be brought closer under the effect of external constraints and can return to the initial state by the elasticity as it is visible on the figure 3 , the thickness of the portion (1a) is identical to the thickness of the cutting blade (3), or lower so as not to hinder the entry of the blade in a tube or profile (6).

L'écart entre les extrémités (1e) et (1f) des ailes est supérieur à l'épaisseur de la lame, de l'ordre de 1 mm pour le mode de réalisation.The gap between the ends (1e) and (1f) of the wings is greater than the thickness of the blade, of the order of 1 mm for the embodiment.

La longueur totale (1) du taquet est inférieure à la longueur totale (L) de la lame.The total length (1) of the cleat is less than the total length (L) of the blade.

Préférentiellement, l'extrémité (1e ou 1f) d'une aile est conformée dans une forme complémentaire à celle du tube à couper, à savoir conformée en arc de cercle pour couper un tube circulaire (cas des figures 4) ou plate pour couper un tube à section rectangulaire (cas de la figure 2).Preferably, the end (1e or 1f) of a wing is shaped in a shape complementary to that of the tube to be cut, namely shaped in an arc to cut a circular tube (case of figures 4 ) or flat to cut a tube with rectangular section (case of the figure 2 ).

Les figures (3) montrent le fonctionnement du taquet pour un cycle de coupe et pour le mode de réalisation des figures 2 à 4 pour lequel les efforts de redressage du tube tendent à comprimer les ailes l'une vers l'autres :

  • au moment de l'entrée de la lame (3) dans un profilé (6) les extrémités (1e ; 1 f) des ailes (1b ; 1c) se rapprochent (figure 3c), et l'entrée de la lame dans le tube (6) génère une déformation (6a) et une fente d'épaisseur déterminée par celle de la lame,
  • lorsque le taquet a entièrement pénétré dans le profilé les extrémités (1e ; 1 f) s'écartent et reprennent leur écartement initial (e) supérieur à l'épaisseur et la lame (3) a entièrement traversé le profilé de la fente du tube,
  • lors de la sortie de la lame (figure 3d) les extrémités (1e ; 1 f) butent contre les bords (6a) déformés de la fente et les redressent,
  • les deux parties du profilés sont ensuite séparées (figure 3e) et la lame de coupe continue sa couse de retour.
The figures (3 ) show the operation of the cleat for a cutting cycle and for the embodiment of the Figures 2 to 4 for which the straightening efforts of the tube tend to compress the wings towards each other:
  • at the moment of entry of the blade (3) into a profile (6) the ends (1e; 1f) of the wings (1b; 1c) come closer together ( figure 3c ), and the entry of the blade into the tube (6) generates a deformation (6a) and a slit of thickness determined by that of the blade,
  • when the cleat has fully penetrated into the profile the ends (1e; 1 f) move apart and return to their initial spacing (e) greater than the thickness and the blade (3) has completely passed through the profile of the slot of the tube,
  • when exiting the blade ( figure 3d ) the ends (1e; 1f) abut against the deformed edges (6a) of the slot and straighten them,
  • the two parts of the profiles are then separated ( figure 3e ) and the cutting blade continues its way back.

On se reporte à présent aux figures 5 à 9 montrant à titre d'exemple un autre mode de réalisation possible d'un taquet, et pour lequel les efforts de redressage du tube agissent en traction sur les extrémités du taquet au lieu d'agir en poussée comme dans les figures 2 à 4.We are now going back to Figures 5 to 9 showing by way of example another possible embodiment of a cleat, and for which the straightening efforts of the tube act in tension on the ends of the cleat instead of acting in thrust as in the Figures 2 to 4 .

Un taquet (10) selon ce mode de réalisation est une pièce composée de deux languettes adjacentes (10c ; 10 b) et parallèles terminées chacune d'une part « coté fixation » par un talon en saillie (10a) et d'autre part « coté tube » par un ergot en saillie (10e).A cleat (10) according to this embodiment is a piece composed of two adjacent tabs (10c; 10b) and parallel each terminated on the one hand "attachment side" by a projecting heel (10a) and on the other hand " next to the tube "by a protruding lug (10e).

La figure 10 montre le profil d'une languette (10b) insérée dans une découpe de lame de coupe 3 du même type que celle des figures 2 à 4 de manière à être encastrée entièrement dans la lame à l'exception du talon (10a) en saillie et servant au maintien par les organes de fixation de la lame (non représentés) et d'un ergot (10e) en biseau et dont le bord intérieur (11) est conformé en arc de cercle ou en méplat selon la forme du tube à redresser.FIG. 10 shows the profile of a tongue (10b) inserted into a cutting blade blank 3 of the same type as that of Figures 2 to 4 so as to be completely embedded in the blade except for the projecting heel (10a) and used for holding by the blade fasteners (not shown) and a bevel (10e) beveled and whose edge interior (11) is shaped in an arc or flat according to the shape of the tube to be straightened.

En outre, l'épaisseur de la languette (10b) diminue vers l'ergot (10e) de façon à ce que, lors du redressage du tube, l'ergot (10e) s'efface dans la lame de coupe sans dépasser sur l'autre face de ladite lame.In addition, the thickness of the tongue (10b) decreases towards the lug (10e) so that, during the straightening of the tube, the lug (10e) disappears into the cutting blade without exceeding the lug. other face of said blade.

La partie en biseau (3c) de la découpe (2) de la lame sert de butée lors du retour de la languette (10b) après découpe et avant redressage du tube.The bevelled portion (3c) of the cutout (2) of the blade serves as a stop when returning the tongue (10b) after cutting and before straightening the tube.

La languette (10c) est identique à la languette (10b) mais en position inverse par rapport à la lame de coupe de façon à présenter une ergot (10f) en saillie sur l'autre face de la lame comme le montrent les figures 7, 5, 9.The tongue (10c) is identical to the tongue (10b) but in the reverse position relative to the cutting blade so as to have a lug (10f) projecting from the other face of the blade as shown by the Figures 7, 5, 9 .

Le taquet (10) pourrait en variante être réalisé en une seule pièce découpée longitudinalement et sur une partie de sa longueur en deux languettes telles que (10e; 10f).The cleat (10) could alternatively be made in one piece cut longitudinally and part of its length in two tongues such as (10e; 10f).

Selon une autre variante et si l'épaisseur de la lame le permet, une languette peut être insérée dans une découpe en forme de rainure ne débouchant que sur une face de la lame de coupe.According to another variant and if the thickness of the blade allows it, a tongue may be inserted into a slot-shaped cutout opening on only one face of the cutting blade.

Préférentiellement les séquences d'un cycle de coupe sont mises en oeuvre dans une machine à commande numérique qui pilote un chariot sur lequel est fixé la lame de coupe unique selon l'invention.Preferably, the sequences of a cutting cycle are implemented in a numerically controlled machine which controls a carriage on which is fixed the single cutting blade according to the invention.

La commande numérique permet de maîtriser de façon simple les courses d'avance et de recul dudit chariot en fonction des dimensions relatives du taquet et du profilé de façon à libérer les ailes du taquet avant le recul de la lame afin de repousser la section déformée du profilé.The numerical control makes it possible to control in a simple way the forward and reverse travel of said carriage according to the relative dimensions of the cleat and the profile so as to release the wings of the cleat before the retreat of the blade in order to push back the deformed section of the profile.

Une même machine peut éventuellement comporter plusieurs postes de coupe, chacun équipé d'une lame selon l'invention.The same machine may possibly comprise several cutting stations, each equipped with a blade according to the invention.

Tout autre dispositif peut être envisagé pour obtenir ce même résultat comme par exemple dispositif à double actionneurs tout ou rien (2 vérins par exemple) montés en série.Any other device can be considered to obtain the same result as for example dual-actuator device all or nothing (2 cylinders for example) connected in series.

L'écartement des deux ailes du taquet peut être réalisé par d'autres dispositions telles, par exemple, qu'un élément élastique ou un actionneur rapporté.The spacing of the two wings of the cleat can be achieved by other arrangements such as, for example, an elastic element or a reported actuator.

Les modes de réalisation du taquet représentés sur les figures ne sont pas limitatifs et peuvent présenter des variantes sans sortir du cadre de l'invention. L'idée générale inventive du taquet étant de présenter une base dont l'épaisseur et au plus égale à l'épaisseur de la lame dans laquelle elle est insérée, base prolongée par une partie déformable élastiquement de façon à présenter une épaisseur (e) supérieure à celle de la lame, épaisseur pouvant être réduite sous l'effet de contraintes extérieures et pouvant revenir à sa valeur initiale (e) par élasticité ; la base étant placée vers la pointe de la lame et la partie déformable étant placée vers le bord opposé de ladite lame. La base pourrait être raccourcie voir supprimée mais il est préférable de la maintenir car elle contribue à faciliter l'entrée de la lame et du taquet lors de la séquence de coupe.The embodiments of the cleat shown in the figures are not limiting and may have variants without departing from the scope of the invention. The general inventive idea of the cleat being to present a base whose thickness and at most equal to the thickness of the blade in which it is inserted, base extended by an elastically deformable portion so as to have a thickness (e) greater to that of the blade, thickness that can be reduced under the effect of external stresses and can return to its initial value (e) by elasticity; the base being placed towards the tip of the blade and the deformable portion being placed towards the opposite edge of said blade. The base could be shortened or removed but it is better to maintain it because it helps to facilitate the entry of the blade and the cleat during the cutting sequence.

Les avantages de l'invention sont non limitativement les suivants :

  • une seule lame et donc un seul axe de mouvement donc dispositif plus simple et plus économique que celui à deux lames avec un temps d'opération plus court.
  • pas d'augmentation de l'encombrement par rapport au moyen mis classiquement en oeuvre pour la coupe avec une seule lame. Le faible encombrement permet d'implanter et/ou d'embarquer plus facilement le dispositif de coupe sur toute machine de façonnage telle que des machines de cintrage de tubes ; ce qui permet par exemple de façonner une pièce dans la barre puis de la couper avant de façonner la suivante tout en garantissant une section coupée non déformée.
  • dans la plupart des cas, le résultat sur la section coupée ne nécessite plus d'opération complémentaire de recalibrage.
The advantages of the invention are not limited to the following:
  • a single blade and therefore a single axis of movement therefore simpler and more economical device than that with two blades with a shorter operating time.
  • no increase in size compared to the means conventionally used for cutting with a single blade. The small footprint makes it easier to implement and / or embark the cutting device on any forming machine such as pipe bending machines; this allows for example to shape a piece in the bar and then cut before shaping the next while ensuring a cut section undeformed.
  • in most cases, the result on the cut section no longer requires any additional recalibration operation.

Claims (9)

  1. Blade for cutting tubes or other hollow profiles, the blade being planar and having a cutting profile (3b) on one side terminated by a point (3a) positioned on an axis of symmetry (5) of the blade, and on the opposite side a plurality of openings (4) for securing said blade, characterised in that it has a projecting element (1c; 10c), (1b; 10b) on at least one of its faces which is completely retractable into the cutting blade under the effect of external pressure and which returns automatically to its initial position when said pressure is removed.
  2. Cutting blade according to claim 1, characterised in that it comprises a projecting element on each of its faces.
  3. Cutting blade according to either of claims 1 or 2, characterised in that the projecting elements (1c; 10c; 1b; 10b) are connected to a catch inserted in a cut-out (2) of the blade (3).
  4. Cutting blade according to claim 3, characterised in that the catch has a base the thickness of which is at most equal to the thickness of the blade into which it is inserted, the base being extended elastically by a deformable part so as to have a thickness (e) greater than that of the blade, the thickness able to be reduced under the effect of external stresses and able to return to its initial value (e) through elasticity.
  5. Cutting blade according to claim 4, characterised in that the cut-out (2) has the form of two essentially rectangular parts centred on the axis of symmetry (5) of said blade, namely a first rectangular part (2a) intended to mount the base of the catch, which is closed at one of the ends centred on the axis (5) and open and opening to the other end centred on the axis (5) towards a second larger part (2b), the catch (1) inserted into the cut-out having a base (1a) inserted into the first part (2a) and extended by at least one wing (1b; 1c) in the second part (2b).
  6. Cutting blade according to claim 5, characterised in that the catch has two wings forming a (V) profile, the point (1d) of which is inserted into the base (1a) and the ends (1e; 1f) of the wings (1b and 1c) of which are spaced apart from one another and can be moved closer together under the effect of external pressure and can return to the initial state by elasticity.
  7. Cutting blade according to claim 6, characterised in that the end of a wing (1b; 1c) is complementary to the form of the profile to be cut.
  8. Cutting blade according to claim 3, characterised in that the catch (10) is a part composed of two adjacent and parallel tabs (10c; 10b) each terminated on the one hand the "securing side" by a projecting stub (10a) and on the other hand the "tube side" by a projecting lug (10e), the thickness of the tab (10b) decreasing towards the lug (10e) such that under the effect of external pressure the lug (10e) retracts into the cutting blade without extending beyond the other face of said blade.
  9. Tube cutting machine comprising at least one station for cutting tubes or other hollow profiles (6) from a horizontal axis (7), characterised in that said cutting station comprises a single cutting blade according to any one of claims 1 to 8, said blade being activated according to translation movements back and forth in a plane perpendicular to the axis (7) of the profile (6).
EP20090305847 2008-09-16 2009-09-15 Cutting blade for hollow profiles with at least one projecting element that is retractable in the blade and a device with such a blade Not-in-force EP2165810B1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR0856210A FR2935921B1 (en) 2008-09-16 2008-09-16 CUTTING BLADE OF HOLLOW PROFILES HAVING AT LEAST ONE DEPRESSABLE ELEMENT IN THE BLADE AND MACHINE HAVING SUCH A BLADE.

Publications (2)

Publication Number Publication Date
EP2165810A1 EP2165810A1 (en) 2010-03-24
EP2165810B1 true EP2165810B1 (en) 2013-04-24

Family

ID=40568628

Family Applications (1)

Application Number Title Priority Date Filing Date
EP20090305847 Not-in-force EP2165810B1 (en) 2008-09-16 2009-09-15 Cutting blade for hollow profiles with at least one projecting element that is retractable in the blade and a device with such a blade

Country Status (2)

Country Link
EP (1) EP2165810B1 (en)
FR (1) FR2935921B1 (en)

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3626323C1 (en) * 1986-08-02 1988-02-11 Hans Deissenberger Cutting device for flexible tubes with spiral wire reinforcement
DE202008000167U1 (en) * 2008-01-02 2008-04-03 Felsberg, Jürgen Cutting tool or cutting blade

Also Published As

Publication number Publication date
EP2165810A1 (en) 2010-03-24
FR2935921A1 (en) 2010-03-19
FR2935921B1 (en) 2010-09-10

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