FR2709995A1 - Method of cutting strips of boron steel assembled in cells - Google Patents

Method of cutting strips of boron steel assembled in cells Download PDF

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Publication number
FR2709995A1
FR2709995A1 FR9311085A FR9311085A FR2709995A1 FR 2709995 A1 FR2709995 A1 FR 2709995A1 FR 9311085 A FR9311085 A FR 9311085A FR 9311085 A FR9311085 A FR 9311085A FR 2709995 A1 FR2709995 A1 FR 2709995A1
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France
Prior art keywords
strips
cutting
plate
tool
cells
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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.)
Granted
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FR9311085A
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French (fr)
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FR2709995B1 (en
Inventor
Ledevin Jacques
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ATEA
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ATEA
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Priority to FR9311085A priority Critical patent/FR2709995B1/en
Publication of FR2709995A1 publication Critical patent/FR2709995A1/en
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Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B26—HAND CUTTING TOOLS; CUTTING; SEVERING
    • B26F—PERFORATING; PUNCHING; CUTTING-OUT; STAMPING-OUT; SEVERING BY MEANS OTHER THAN CUTTING
    • B26F3/00—Severing by means other than cutting; Apparatus therefor
    • B26F3/004—Severing by means other than cutting; Apparatus therefor by means of a fluid jet
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K26/00—Working by laser beam, e.g. welding, cutting or boring
    • B23K26/02—Positioning or observing the workpiece, e.g. with respect to the point of impact; Aligning, aiming or focusing the laser beam
    • B23K26/04—Automatically aligning, aiming or focusing the laser beam, e.g. using the back-scattered light
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K26/00—Working by laser beam, e.g. welding, cutting or boring
    • B23K26/36—Removing material
    • B23K26/362—Laser etching
    • B23K26/364—Laser etching for making a groove or trench, e.g. for scribing a break initiation groove
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K33/00—Specially-profiled edge portions of workpieces for making soldering or welding connections; Filling the seams formed thereby
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24C—ABRASIVE OR RELATED BLASTING WITH PARTICULATE MATERIAL
    • B24C1/00—Methods for use of abrasive blasting for producing particular effects; Use of auxiliary equipment in connection with such methods
    • B24C1/04—Methods for use of abrasive blasting for producing particular effects; Use of auxiliary equipment in connection with such methods for treating only selected parts of a surface, e.g. for carving stone or glass
    • B24C1/045—Methods for use of abrasive blasting for producing particular effects; Use of auxiliary equipment in connection with such methods for treating only selected parts of a surface, e.g. for carving stone or glass for cutting
    • 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
    • B26D3/10—Making cuts of other than simple rectilinear form
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K2103/00—Materials to be soldered, welded or cut
    • B23K2103/02—Iron or ferrous alloys
    • B23K2103/04—Steel or steel alloys

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Forests & Forestry (AREA)
  • Plasma & Fusion (AREA)
  • Laser Beam Processing (AREA)

Abstract

Method of cutting crenellated strips (6), by means of a tool (3) moved over a plate (1) along broken lines (5). Two longitudinal sides of strips (6) are produced as soon as a broken line (5) is reached, so that machining is more rapid and causes less material to be lost. The cutting clearance is very low, something which makes it possible to imbricate the contiguous strips (6) between one another in order to form a cell. Application to the storage of nuclear fuel rods in storage racks.

Description

PROCEDE DE DECOUPAGE DE BANDES D'ACIER BORE ASSEMBLEES
EN CELLULES
DESCRIPTION
L'invention se rapporte à un procédé de découpage de bandes d'acier boré qu'il convient d'assembler ensuite en cellules destinées en principe à contenir des crayons ou aiguilles de combustible nucléaire rangés dans des râteliers et peu espacés.METHOD OF CUTTING ASSEMBLED BORON STEEL STRIPS
IN CELLS
DESCRIPTION
The invention relates to a process for cutting strips of borated steel which should then be assembled into cells intended in principle to contain rods or needles of nuclear fuel stored in racks and with little spacing.

L'acier boré a une fonction d'absorption des neutrons qui limite donc fortement l'interaction des crayons entre eux et interdit tout risque de réaction critique.Boron steel has a neutron absorption function which therefore greatly limits the interaction of the rods with each other and prevents any risk of critical reaction.

Conformément au brevet français n"2 680 909 de la même déposante, les cellules peuvent être constituées par des assemblages à section carrée de bandes assez longues (près de quatre mètres dans la réalisation envisagée) dont les côtés longitudinaux sont crénelés en saillies et indentations qu'on imbrique pour joindre des paires de côtés longitudinaux et assembler la cellule. On obtient une structure rigide où les bandes sont toutes appuyées sur un taquet individuel et se maintiennent mutuellement, de sorte que les assemblages sont bien soutenus et entourés par un produit boré.In accordance with French Patent No. 2,680,909 by the same applicant, the cells can be formed by square section assemblies of fairly long strips (nearly four meters in the envisaged embodiment) whose longitudinal sides are crenellated with projections and indentations that "We nest to join pairs of longitudinal sides and assemble the cell. We obtain a rigid structure where the bands are all supported on an individual cleat and are mutually maintained, so that the assemblies are well supported and surrounded by a borated product.

L'inconvénient de cette construction est que des opérations d'usinage complexes doivent être accomplies pour façonner les plaques, ce qui loin d'être sans conséquence car l'acier boré est particulièrement difficile à usiner correctement. Le croquage d'une bande étroite de place en place pour enlever de la matière et creuser ainsi des indentations, au moyen d'une fraise ou d'un outil d'usinage du même genre, n'est ainsi guère concevable car il entraîne la perte en copeaux d'une quantité de matière relativement importante et dont le prix est assez élevé.  The disadvantage of this construction is that complex machining operations have to be carried out to shape the plates, which is far from being of no consequence since boron steel is particularly difficult to machine correctly. The crunching of a narrow band from place to place to remove material and thus dig indentations, using a cutter or a similar machining tool, is hardly conceivable because it causes the loss of relatively large quantities of material at a fairly high price.

Un autre inconvénient est que l'état de surface des indentations serait mauvais. Another disadvantage is that the surface condition of the indentations would be bad.

C'est pourquoi l'invention est caractérisée en ce qu'une plaque est découpée par un outil orienté perpendiculairement à elle et déplacé par rapport à elle suivant des lignes brisées parallèles dont chacune sépare deux côtés longitudinaux de deux des bandes. On n'utilise ainsi qu'une seule passe de l'outil pour tracer deux côtés longitudinaux à la fois, ce qui accélère beaucoup la durée totale de fabrication des bandes. De façon inattendue, on peut choisir des outils dont l'épaisseur est suffisamment faible pour que les côtés des bandes divisées par chacune des lignes brisées ne soient séparés que par un jeu suffisamment faible pour les assembler ensuite dans les conditions' d'ajustement souhaitées. This is why the invention is characterized in that a plate is cut by a tool oriented perpendicularly to it and moved relative to it along parallel broken lines each of which separates two longitudinal sides of two of the strips. Thus, only one pass of the tool is used to trace two longitudinal sides at the same time, which greatly accelerates the total time for manufacturing the strips. Unexpectedly, it is possible to choose tools the thickness of which is sufficiently small so that the sides of the strips divided by each of the broken lines are separated only by a clearance which is sufficiently small to then assemble them under the desired adjustment conditions.

On va maintenant décrire l'invention plus en détail à l'aide des figures annexées à titre illustratif et non limitatif, parmi lesquelles la figure 1 représente la plaque et son découpage, et la figure 2 une bande découpée. The invention will now be described in more detail with the aid of the figures annexed by way of illustration and not limitation, among which FIG. 1 represents the plate and its cutting, and FIG. 2 a cut strip.

La plaque porte la référence 1. Elle est obtenue en sectionnant une bande laminée d'acier boré à une longueur guère supérieure à celle des bandes à côtés crénelés qu'il faut obtenir, puis posée sur la table 2 d'une machine à commande numérique. Un outil constitué dans la réalisation représentée par un laser 3 effectue deux découpures des extrémités de la plaque 1 pour en retirer les bords longitudinaux 4, puis il est déplacé le long de lignes brisés 5 toutes parallèles entre elles et formées de segments longitudinaux de longueur égale (sauf aux extrémités) et qui se prolongent sur deux droites, ainsi que de segments transversaux égaux entre eux mais beaucoup plus courts qui alternent avec les segments longitudinaux. Les saillies et les indentations sont constituées entre les segments transversaux et résultent des deux niveaux des segments longitudinaux. The plate bears the reference 1. It is obtained by cutting a rolled strip of borated steel to a length little greater than that of the strips with crenellated sides which it is necessary to obtain, then placed on the table 2 of a numerically controlled machine. . A tool constituted in the embodiment represented by a laser 3 cuts the ends of the plate 1 twice to remove the longitudinal edges 4, then it is moved along broken lines 5 all parallel to each other and formed of longitudinal segments of equal length (except at the ends) and which extend on two straight lines, as well as transverse segments equal to each other but much shorter which alternate with the longitudinal segments. The projections and indentations are formed between the transverse segments and result from the two levels of the longitudinal segments.

Les lignes brisées 5 s'étendent d'un bout à l'autre de la plaque 1 et séparent finalement les côtés longitudinaux crénelés des bandes 6 à assembler. La programmation des déplacements du laser 3 ou de la table 2 est extrêmement facile avec une machine à commande numérique car il suffit d'introduire des incréments peu nombreux et immuables (longueur des segments longitudinaux et transversaux et largeur des bandes 6), qui seront d'ailleurs normalement découplés suivant les coordonnées X et Y de la machine. Comme le laser 3 ne subit ni effort ni déformation, les bandes 6 obtenues sont conformes aux cotes souhaitées, ont des dimensions presque exactement semblables et peuvent être assemblées sans contrainte d'ordre ou de compatibilité. Il est donc inutile de les repérer par un numéro ou d'une autre façon.The broken lines 5 extend from one end to the other of the plate 1 and finally separate the crenellated longitudinal sides of the strips 6 to be assembled. Programming the movements of the laser 3 or of the table 2 is extremely easy with a numerically controlled machine because it suffices to introduce few and immutable increments (length of the longitudinal and transverse segments and width of the bands 6), which will be d 'elsewhere normally decoupled according to the X and Y coordinates of the machine. As the laser 3 does not undergo any effort or deformation, the bands 6 obtained conform to the desired dimensions, have almost exactly similar dimensions and can be assembled without constraint of order or compatibility. There is therefore no point in locating them by number or otherwise.

Il est avantageux de choisir la plaque 1 suffisamment large pour qu'on puisse y découper un nombre de bandes 6 suffisant pour former une cellule, voire plusieurs. Dans le cas illustré, on compte six bandes 6 pour former une cellule à section hexagonale ; des cellules carrées formées de quatre bandes 6 à l'instar du brevet cité plus haut peuvent aussi être choisies et fabriquées conformément à l'invention. La plaque 1 s'étend au-dessus d'un creux de la table 2 et chacune des bandes 6 est soutenue par des plots 7 situés sous elle, et serrée par des mors 8 à ses extrémités dès que les bords longitudinaux 4 sont enlevés. Cependant, seuls quelques plots 7 et mors 8 ont été représentés, pour des raisons de clarté. It is advantageous to choose the plate 1 large enough so that a number of strips 6 can be cut there sufficient to form a cell, or even several. In the illustrated case, there are six bands 6 to form a hexagonal cell; square cells formed from four bands 6 like the patent cited above can also be chosen and manufactured in accordance with the invention. The plate 1 extends above a hollow in the table 2 and each of the bands 6 is supported by studs 7 located under it, and clamped by jaws 8 at its ends as soon as the longitudinal edges 4 are removed. However, only a few pads 7 and jaws 8 have been shown, for reasons of clarity.

Les bords latéraux 9 de la plaque 1 sont seuls sacrifiés, ce qui serait cependant nécessaire quel que soit le nombre de bandes 6 découpé. Dans le cas présent, la matière perdue est donc pratiquement six fois moins abondante qu'en extrayant une seule bande crénelée d'une bande laminée mince. Only the side edges 9 of the plate 1 are sacrificed, which would however be necessary regardless of the number of strips 6 cut. In the present case, the lost material is therefore practically six times less abundant than by extracting a single crenellated strip from a thin laminated strip.

Il est possible d'envisager l'emploi de plusieurs outils travaillant en parallèle et disposés à des places fixes et uniformément réparties sur un râtelier qui serait déplacé au-dessus de la plaque 1. It is possible to envisage the use of several tools working in parallel and arranged in fixed places and uniformly distributed on a rack which would be moved above the plate 1.

Chaque outil serait alors responsable de la découpure sur une des lignes brisées 5, et toutes les bandes 6 seraient produites en même temps. L'indentité des dimensions des bandes 6 serait alors encore plus certaine.Each tool would then be responsible for cutting on one of the broken lines 5, and all the strips 6 would be produced at the same time. The identity of the dimensions of the strips 6 would then be even more certain.

Le laser 3 pourrait être remplacé par un outil analogue tel qu'un dispositif à jet d'eau abrasif, voire un autre outil d'allure filiforme et disposé perpendiculairement à la plaque 1. Les outils sans contact matériel avec la plaque 1 sont préférés car ils ne risquent pas de la déformer ou d'être eux-mêmes déformés par des efforts de coupe et de produire ainsi des bandes 6 qu'on ne pourrait assembler.  The laser 3 could be replaced by a similar tool such as an abrasive water jet device, or even another tool with a threadlike appearance and arranged perpendicular to the plate 1. Tools without material contact with the plate 1 are preferred because they do not run the risk of deforming it or of being itself deformed by cutting forces and thus producing strips 6 which cannot be assembled.

Claims (5)

REVENDICATIONS 1. Procédé de découpage de bandes (6) d'acier boré présentant des côtés longitudinaux crénelés en saillies et indentations, les bandes devant être assemblées en cellules, en imbriquant des paires de côtés longitudinaux, caractérisé en ce qu'il consiste à découper une plaque (1) par un outil orienté perpendiculairement à la plaque et déplacé par rapport à la plaque suivant des lignes brisées parallèles (5) dont chacune sépare deux côtés longitudinaux de deux des bandes (6). 1. A method of cutting strips (6) of borated steel having jagged longitudinal sides in projections and indentations, the strips to be assembled in cells, by nesting pairs of longitudinal sides, characterized in that it consists in cutting a plate (1) by a tool oriented perpendicular to the plate and moved relative to the plate along parallel broken lines (5) each of which separates two longitudinal sides of two of the strips (6). 2. Procédé de découpage de bandes d'acier boré suivant la revendication 1, caractérisé en ce que les bandes découpées sur la plaque (1) sont en nombre suffisant pour constituer au moins une cellule. 2. A method of cutting borated steel strips according to claim 1, characterized in that the strips cut on the plate (1) are in sufficient number to constitute at least one cell. 3. Procédé de découpage de bandes d'acier boré suivant l'une quelconque des revendications 1 ou 2, caractérisé en ce que l'outil (3) est un laser. 3. A method of cutting borated steel strips according to any one of claims 1 or 2, characterized in that the tool (3) is a laser. 4. Procédé de découpage de bandes d'acier boré suivant l'une quelconque des revendications 1 à 3, caractérisé en ce que l'outil est un jet de liquide abrasif. 4. A method of cutting borated steel strips according to any one of claims 1 to 3, characterized in that the tool is a jet of abrasive liquid. 5. Procédé de découpage de bandes d'acier boré suivant l'une quelconque des revendications 1 à 4, caractérisé en ce que plusieurs outils solidaires sont utilisés pour découper simultanément la plaque.  5. A method of cutting borated steel strips according to any one of claims 1 to 4, characterized in that several integral tools are used to simultaneously cut the plate.
FR9311085A 1993-09-17 1993-09-17 Process for cutting boron steel strips assembled into cells. Expired - Fee Related FR2709995B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
FR9311085A FR2709995B1 (en) 1993-09-17 1993-09-17 Process for cutting boron steel strips assembled into cells.

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR9311085A FR2709995B1 (en) 1993-09-17 1993-09-17 Process for cutting boron steel strips assembled into cells.

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FR2709995A1 true FR2709995A1 (en) 1995-03-24
FR2709995B1 FR2709995B1 (en) 1995-12-01

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Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0732473A1 (en) * 1995-03-17 1996-09-18 Ford-Werke Aktiengesellschaft Method of manufacturing hinge part blanks from strip material
EP0773554A1 (en) 1995-11-10 1997-05-14 A.T.E.A. Société Atlantique de Techniques Avancées Installation and method for joint storage of nuclear fuel assemblies and control rods
EP0896339A1 (en) * 1997-08-07 1999-02-10 A.T.E.A. Société Atlantique de Techniques Avancées Method for refurbishing a nuclear fuel assembly storage rack
FR2792762A1 (en) * 1999-04-23 2000-10-27 Atea Cutting of sheet metal covering layer of neutrophagous material on nuclear fuel assembly storage rack cell comprises use of cutting head which cuts along one or both long sides together
EP2261436A3 (en) * 2009-06-12 2014-11-19 Arsenio Borgnini System and method for producing a sheet metal strip with notched edge

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1989009116A1 (en) * 1986-10-03 1989-10-05 Nielsen Axel Groenlund Self-locking tongs and a method of producing self-locking tongs intended for round and hexagonal material
FR2680909A1 (en) * 1991-09-04 1993-03-05 Atea Ste Atlantique Tech Avanc Rack for storage or for transport of nuclear fuel and its method of manufacture
WO1993016839A1 (en) * 1992-02-25 1993-09-02 Instituttet For Produktudvikling A method of accurately joining together two sheet sections

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1989009116A1 (en) * 1986-10-03 1989-10-05 Nielsen Axel Groenlund Self-locking tongs and a method of producing self-locking tongs intended for round and hexagonal material
FR2680909A1 (en) * 1991-09-04 1993-03-05 Atea Ste Atlantique Tech Avanc Rack for storage or for transport of nuclear fuel and its method of manufacture
WO1993016839A1 (en) * 1992-02-25 1993-09-02 Instituttet For Produktudvikling A method of accurately joining together two sheet sections

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
GLAZIER: "WATERJET CUTTING- A STATUS REPORT", MANUFACTURING TECHNOLOGY INTERNATIONAL, 1991, LONDON GB, pages 215 - 218 *
SAUNDERS: "WATER AS A CUTTING TOOL", ENGINEERING. (INCL. MACHINE SHOP MAGAZINE), vol. 217, no. 4, April 1977 (1977-04-01), LONDON GB, pages 297 - 301 *

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0732473A1 (en) * 1995-03-17 1996-09-18 Ford-Werke Aktiengesellschaft Method of manufacturing hinge part blanks from strip material
EP0773554A1 (en) 1995-11-10 1997-05-14 A.T.E.A. Société Atlantique de Techniques Avancées Installation and method for joint storage of nuclear fuel assemblies and control rods
EP0896339A1 (en) * 1997-08-07 1999-02-10 A.T.E.A. Société Atlantique de Techniques Avancées Method for refurbishing a nuclear fuel assembly storage rack
FR2767220A1 (en) * 1997-08-07 1999-02-12 Atea PROCESS FOR RENOVATION OF A NUCLEAR FUEL ASSEMBLY STORAGE RACK
FR2792762A1 (en) * 1999-04-23 2000-10-27 Atea Cutting of sheet metal covering layer of neutrophagous material on nuclear fuel assembly storage rack cell comprises use of cutting head which cuts along one or both long sides together
BE1013308A3 (en) * 1999-04-23 2001-11-06 Atlantique De Tech Avancees At PROCESS FOR CUTTING OF STEEL HOLDING A SHEET OF neutron-absorbing TO A WALL OF ALVEOLE RATELIER STORAGE OF FUEL ASSEMBLIES.
EP2261436A3 (en) * 2009-06-12 2014-11-19 Arsenio Borgnini System and method for producing a sheet metal strip with notched edge

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