• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    The invention relates to a method for partitioning a predetermined placement (P) of pieces to be cut in a flexible sheet material by moving at least two cutting tools in two directions (X, Y) in at least two distinct and determined cutting windows along which the material is successively advanced, in which, from a predetermined placement of the pieces in the material, the method comprises the automatic creation of groups of pieces (G-1 to Gm) separate from each other; each other by assigning each piece to a single group of pieces according to its geometric placement, each group of pieces being associated, for cutting, to the same cutting tool (0-1 to Ok) and to the same window of cutting (F-1 to FI), and the application of spacings between different groups of pieces.
    公开号:FR3060432A1
    申请号:FR1662692
    申请日:2016-12-16
    公开日:2018-06-22
    发明作者:Bruno Valeze；Yohan Michael Christophe Bourget
    申请人:Lectra SA；
    IPC主号:
    专利说明:

    Holder (s): LECTRA Société anonyme.
    Extension request (s)
    Agent (s): CABINET BEAU DE LOMENIE Civil society.
    PROCESS FOR PARTITIONING A PREDETERMINED PLACEMENT OF PARTS INTENDED TO BE CUT FROM A FLEXIBLE SHEET MATERIAL.
    FR 3 060 432 - A1
    15 // The invention relates to a method of partitioning a predetermined placement (P) of parts intended to be cut from a flexible sheet material by displacement of at least one cutting tool in two directions (X, Y) in at least two separate and determined cutting windows along which the material is successively advanced, in which, from a predetermined placement of the parts in the material, the method comprises the automatic creation of groups of parts (G-1 to Gm ) distinct from each other by assigning each part to a single group of parts according to its geometric placement, each group of parts being associated, for cutting, with the same cutting tool (0-1 to Ok) and a same cutting window (F-1 to Fl), and the application of spacings between the different groups of parts.
    e-1
    Title of invention
    Method for partitioning a predetermined placement of parts intended to be cut from a flexible sheet material
    Invention background
    The present invention relates to a method of partitioning a predetermined placement of parts intended to be cut from a flexible sheet material.
    The field of application of the invention is in particular that of cutting machines which include a work table on which the cuts of the parts are carried out by displacement of one or more cutting tools relative to the material in two directions, portions of the material being brought into the working area of the cutting tools.
    This is particularly the case with numerically controlled cutting machines used for cutting fabrics, felts, leathers or other flexible sheet materials in the clothing, furniture, automobile industry, etc.
    With such cutting machines, the parts are cut according to a predetermined placement which is defined so as to minimize material losses. In order to limit the size of these cutting machines, the cutting window (or working area) in which each cutting tool works is generally of dimensions smaller than those of a complete placement. To cut all the pieces of a placement, it is therefore necessary to order intermittent feeds of the material in order to bring new portions of it into the cutting windows, the feed of the material being controlled separately from the movement cutting tools.
    In the field of production of airbags (airbags), manufacturers are frequently required to cut placements made up only of small parts, these placements being optimized to minimize losses while having the highest possible cutting speed . In fact, these placements are cut out very regularly and any variation in the optimization of the placement implies significant effects on the consumption of material and therefore on the overall cost of production of these parts.
    To this end, placements of this type are generally cut by cutting machines comprising at least two cutting tools. These cutting tools work in parallel in cutting windows covering the entire width of the placement but only over a portion of its length, which requires controlling feeds of the material as the pieces are cut.
    In practice, recurring problems appear when cutting the placements, in particular in the border areas between the sets of pieces of the placement successively cut by the same cutting tool. Indeed, it is possible that when the cutting tool attacks the cutting of a part, the parts of the sets of neighboring parts have already been cut. However, in this situation, the suction effect of the material, which normally allows it to be maintained on the work table during cutting, is greatly reduced around the workpiece due to the close proximity of the piece to be cut with the pieces already cut. As a result, the workpiece is no longer held as well on the work table, so that the cutting tool tends to carry away the material when it is moved. Most often, this results in cutting faults on these parts.
    To remedy this problem, the solution which would consist in adding to the optimized placement of the pieces the spacings between each piece (that is to say a margin around each piece) is not entirely satisfactory. By using this feature, the successive cutting of the pieces results in a much larger material skeleton than in the absence of spacing, which increases the suction effect of the material, even in areas where most parts are already cut. Cutting faults can thus be avoided. On the other hand, the addition of these spacings induces a loss of material which can be significant for this type of placement where the number of pieces is high (the higher the number of pieces, the more space lost by adding margins is in significant proportion). However, as indicated above, optimizing losses while maintaining a high cutting speed is a crucial issue for manufacturers who use this type of investment.
    Subject and summary of the invention
    The main object of the present invention therefore is to overcome such drawbacks by proposing to partition a predetermined placement of parts in order to avoid cutting faults in sensitive areas without reducing the efficiency of the placement.
    According to the invention, this object is achieved by a method of partitioning a predetermined placement of parts intended to be cut from a flexible sheet material by displacement of at least one cutting tool in two directions in at least two separate and defined cutting windows along which the material is successively advanced, in which, from a predetermined placement of the parts in the material, the method comprises the automatic creation of groups of distinct parts from each other by affecting each part to a single group of parts according to its geometric placement, each group of parts being associated, for cutting, with the same cutting tool and with the same cutting window, and the application of spacings between the different groups of rooms.
    The method according to the invention is remarkable in that, from an optimized placement of parts, it provides for assigning each part of the placement to a group of parts which is associated, for cutting the parts, with the same tool. and at the same cutting window. From these groups of parts, the method according to the invention provides for adding spacings between the different groups thus formed. Thus, the method according to the invention adds spacings only between groups of parts at locations where risks of creating cutting defects in the parts are identified. In this way, the method according to the invention makes it possible to avoid cutting faults while limiting the loss of efficiency of the predetermined placement.
    The step of automatically creating groups of parts can comprise, for each part of the placement, the assignment of the part to one of the cutting tools as a function of a transverse position of said part taken along a direction transverse of the material with respect to its direction of advance; and if the cutting tool to which the part is assigned has been previously associated with a predefined group of parts, the comparison of a length taken in the direction of the direction of advance of the material of a rectangle encompassing all of the pieces of the group and to which said piece is added with a length of a cutting window;
    if the length of the rectangle is less than the length of the cutting window, the assignment of the part to the predefined group of parts;
    if the length of the rectangle is greater than or equal to the length of the cutting window or if the cutting tool to which the part is assigned has not previously been associated with any predefined group of parts, the creation of a new group of parts associated with the cutting tool and a new cutting window and the assignment of the part to the new group of parts.
    In this case, the assignment of the pieces to one of the cutting tools can comprise the partitioning of the placement of the pieces in the direction of a width of the partitioning as a function of the number of distinct cutting tools used to cut the pieces, partitioning of the resulting placement into adjacent placement zones having the same width and each associated with a single cutting tool, and allocation of each placement piece to one of the placement zones according to the transverse position of the room.
    In addition, prior to the assignment of each piece of placement to one of the placement areas, the pieces are preferably sorted in ascending order according to a longitudinal position of said pieces taken along the direction of advance of the material.
    Likewise, the transverse position of a part can correspond to a position of the geometric center of the smaller rectangle encompassing the part.
    Preferably, the step of applying spacings between the different groups of parts comprises the application to each part of the same group of parts with the same longitudinal offset according to the direction of advance of the material and of a same transverse offset in the direction transverse to the direction of advance of the material.
    In this case, the longitudinal offset applied to each part of the same group may depend on the cutting window and the cutting tool with which the group of parts is associated.
    Preferably also, the method further comprises, after the step of applying spacings between the different groups of parts, the automatic identification of possible overlapping zones between parts of different groups of parts and the correction of these overlapping areas.
    The predetermined placement of the parts in the material advantageously corresponds to an optimized placement calculated automatically to minimize the loss of material.
    The invention also relates to the use of the method as defined above for the partitioning of a predetermined placement of reinforcing parts for airbags intended to be cut from a material.
    The invention also relates to a computer program comprising instructions for the execution of the steps of the method of partitioning a predetermined placement of parts as defined above.
    The invention also relates to an information medium readable by a computer and comprising instructions of a computer program as mentioned above. The information medium can be any entity or device capable of storing the program. For example, the support may include a storage means, such as a ROM, for example a CD ROM or a microelectronic circuit ROM, or else a magnetic recording means, for example a floppy disk or a disc. hard.
    On the other hand, the information medium can be a transmissible medium such as an electrical or optical signal, which can be routed via an electrical or optical cable, by radio or by other means. The program according to the invention can in particular be downloaded from a network of the Internet type. Alternatively, the information medium can be an integrated circuit in which the program is incorporated, the circuit being adapted to execute or to be used in the execution of the process in question.
    Brief description of the drawings
    Other characteristics and advantages of the present invention will emerge from the description given below, with reference to the accompanying drawings which illustrate exemplary embodiments thereof without any limiting character. In the figures:
    - Figure 1 is a schematic view showing an example of optimized placement of parts from which applies the partitioning method according to the invention;
    - Figure 2 is a flowchart illustrating the main steps of the partitioning method according to the invention;
    - Figure 3 is a view showing the implementation of one of the steps of the partitioning method according to the invention;
    - Figure 4 is a schematic view showing the application of the partitioning method according to the invention to the optimized placement of Figure 1;
    - Figure 5 is a magnifying glass of Figure 4; and
    - Figures 6A and 6B show another example of application of the partitioning method according to the invention before and after intervention by an operator to remove any overlap between the parts of the placement.
    Detailed description of the invention
    The invention applies to the placement of parts intended to be cut from a flexible sheet material by numerically controlled cutting machines which include a work table on which the parts are cut.
    In a manner known per se, the working table of these cutting machines is constituted by the upper surface of an endless conveyor housed in a box inside of which a depression can be established according to a technique well known to man. art. Flexible sheet material is fed to the endless conveyor which continuously supports and drives the material along the work table. The advancement of the material on the work table in a longitudinal direction X is effected by controlling the drive motor of the conveyor.
    The installation also includes a cutting system which consists of one or more cutting tools which can move horizontally in the longitudinal direction X of the conveyor and in a transverse direction Y perpendicular to the direction X. These cutting tools move each above a working area, hereinafter called "cutting window", successive portions of the material being brought by driving the conveyor into these cutting windows.
    The cutting system of these machines is numerically controlled, that is to say it is controlled from a computer workstation. The commands for moving the cutting tools to cut the pieces come from a predetermined positioning of the pieces which is saved in a memory of the work station.
    Typically, the predetermined placement of the parts is a digital file which contains instructions for controlling the cutting tools. This predetermined placement is developed by an operator (or automatically by software) from the geometric profile of the parts, in particular so as to minimize material losses and optimize the cutting speed.
    FIG. 1 thus represents an example of such an optimized placement for cutting a plurality of identical parts and pieces (n pieces) and of small dimensions, here reinforcement pieces for airbags (airbags).
    Note on this figure 1 that the placement P of the n pieces [-1, p-2, ..., pi ... pn] is compact (the pieces are very close to each other) and organized so as to optimize efficiency (all parts are arranged in parallel lines along the Y axis and oriented in the same way).
    From such a predetermined placement P, the invention provides a method for obtaining a partitioned placement P 'in which the pieces to be cut are automatically grouped, as a function of their geometric location in the placement, in m different groups of pieces [ Gl, G-2, ... Gh, ... Gm] each associated with the same cutting tool [Ol, O-2, ... Oj, ... Ok] and with the same cutting window [Fl , F-2, ... Fi, ... Fl]. The groups of parts thus created are then spaced from each other.
    FIG. 2 represents the different stages of the partitioning method according to an embodiment of the invention. In this embodiment, the partitioning method is in the form of an algorithm implemented in software equipping the workstation from the following input data entered by the operator: digital file containing the placement P, number of cutting tools of the cutting machine with which the placement will be cut, and length of a cutting window (all the cutting windows F1 to F1 having the same length).
    According to a first step SI of the method, all the pieces p-1 to pn of the predetermined placement P are sorted in ascending order as a function of a longitudinal position of said pieces in the placement taken along the longitudinal direction X of advance of the material on the cutting table.
    More precisely, for each piece p-i of the placement, a bounding box B-i is calculated which is the smallest rectangle which can contain said piece (see FIG. 3). All the parts of the placement are then classified in ascending order of the minimum abscissa Xmin of the bounding box B-i which is associated with them.
    The pieces of the placement are then taken one after the other according to their sorting to assign them to a group of pieces according to steps S2 to S7 which are repeated for all the pieces.
    In a step S2, each piece p-i is assigned to a cutting tool O-i as a function of its transverse position, that is to say of its position taken along the transverse direction Y.
    More precisely, for the determination of the transverse position of the part p-i, we will take the ordinate Yc of the geometric center of the bounding box B-i associated with the part.
    In practice, if the cutting machine has only one cutting tool, all the parts of the placement will of course be assigned to this single cutting tool.
    If the machine has more than one cutting tool Oj, divide the width of the cutting table into as many placement zones as there are cutting tools, these placement zones being of the same width and each associated to one of the cutting tools. Thus, as a function of the ordinate Yc of the geometric center of the bounding box B-i associated with each part, it will be possible to deduce therefrom which cutting tool O-j the part is assigned.
    The following step S3 consists in determining whether the cutting tool O-j to which the part p-i has been assigned has previously been associated with a group of parts G-h.
    If this is the case, the method provides, during a step S4, for calculating the length L taken in the direction of the direction of advance X of the material of a rectangle H encompassing all the parts of the group in question and to which said part is added.
    FIG. 3 represents an example of calculation of such a length L for the part p-j. In this figure is shown in particular the rectangle K-j encompassing all the parts of the group of parts G-j associated with the cutting tool. The rectangle identified by the reference H-j corresponds to the rectangle K-j extended to the part p-j. In this example, the length L of the rectangle K-j is identical to that of the rectangle H-j including only the parts of the group of parts G-j.
    The length L thus calculated is compared with the length L 'of a cutting window F-i previously associated with the group of parts Gh, this length being one of the data entered by the operator.
    If the length L of the rectangle encompassing all the parts of the group in question and to which the part is added is less than the length L 'of the cut window Fi, then the part in question is assigned to the group of parts Gh associated with the cutting tool Oj (step S5).
    Conversely, if the length L of the rectangle encompassing all the parts of the group in question and to which the part is added is greater than or equal to the length L 'of the cutting window Fi, then the part in question n' is not assigned to the part group Gh associated with the cutting tool Oj.
    In this case, a new group of parts G-h + 1, distinct from the group Gh, is created, this new group of parts being associated with the cutting tool Oj and with a new cutting window F-i + 1 ( step S6). In practice, the new cutting window F-i + 1 is a cutting window which is offset longitudinally towards the increasing abscissae with respect to the cutting window F-i previously defined.
    The part p-i for which the length L is greater than or equal to the length L is then assigned to this new group of parts Gh + 1 (step S7).
    Steps S2 to S7 are repeated for all of the n pieces p-1 to p-n of the placement P.
    Once all the parts have been assigned to one of the m groups of parts G-1 to G-m, the method according to the invention provides for applying spacings between the different groups of parts G-1 to G-m (step S8).
    More precisely, this step of applying spacings between the different groups of parts comprises the application to each part pi of the same group of parts Gh with the same longitudinal offset DX (that is to say according to the direction d 'advance X of the material) and of the same transverse offset DY (that is to say in the transverse direction Y).
    FIG. 4 illustrates an example of the application of such spacings. In this figure are represented 4 groups of parts Gl, G-2, G-3 and G-4, the groups of parts Gl and G-3 being associated with the same cutting tool Ol and with two cutting windows Fl, F- 2 different, while the groups of parts G-2 and G-4 are associated with another cutting tool O-2 and with the same two cutting windows F1, F-2. These groups of parts G-1 to G-4 were formed at the end of the implementation of steps S2 to S7 described above.
    As shown more precisely in FIG. 5, the spacings DX and DY were then applied between these 4 groups of parts G-1 to G-4.
    In practice, the longitudinal DX and transverse offsets DY applied to each part of the same group of parts depend on the cutting window and the cutting tool with which the group of parts is associated: the parts of the group of parts Gl n '' have undergone no longitudinal and transverse shift; the parts of group of parts G-2 have only undergone the same transverse shift DY; the parts in group of parts G-3 have undergone only one DX longitudinal shift; and the parts of the group of parts G-4 have undergone both the same longitudinal shift DX and the same transverse shift DY.
    Once the displacements have been applied between the different groups of parts G-l to G-m, the digital file containing in particular the new geometric coordinates of the parts is saved so that it can be used by the cutting machine.
    FIGS. 6A and 6B illustrate another example of implementation of the partitioning method according to the invention.
    In this example, the pieces q of the partitioned placement Q 'have a different geometric shape from that of the pieces of the placement P described above. Due to this particular geometric shape, the result of the partitioning implemented by the method according to the invention can result in overlaps between parts located at the border between two groups of neighboring parts. These overlaps are identified in FIG. 6A by the references Ch.
    In this situation, the computer station software automatically identifies these areas of overlap between the parts and visually reports them to the operator. The latter can then intervene manually to assign the parts concerned to another group of parts than that to which the algorithm had established so as to apply to these parts displacements making it possible to avoid any overlap with neighboring parts.
    Thus, as shown in FIG. 6B, the operator will assign the pieces q-i and q-j (previously assigned to the group of pieces G-k) to the neighboring group of pieces G-l. Likewise, the part q-k previously assigned to the group of pieces G-m will be assigned to the group of pieces G-n, and the piece q-l previously assigned to the group of pieces G-m will be assigned to the group of pieces G-l.
    The reassignment of these parts q-i to q-l to other groups of parts will automatically cause their displacement and thus make it possible to remove any overlap with neighboring parts.
    权利要求:
    Claims (12)
    [1" id="c-fr-0001]
    1. Method for partitioning a predetermined placement (P) of parts (p-1 to pn) intended to be cut from a flexible sheet material by displacement of at least one cutting tool in two directions (X, Y) in at least two separate and determined cutting windows along which the material is successively advanced, in which, from a predetermined placement of the parts in the material, the method comprises:
    automatic creation of groups of parts (Gl to Gm) distinct from each other by assigning each part to a single group of parts according to its geometric placement, each group of parts being associated, for cutting, with the same tool section (Ol to Ok) and to the same section window (Fl to Fl); and the application of spacings (DX, DY) between the different groups of parts.
    [2" id="c-fr-0002]
    2. Method according to claim 1, in which the step of automatic creation of groups of parts comprises, for each part (pi) of the placement, the assignment of the part to one of the cutting tools (Oj) according to of a transverse position of said part taken along a transverse direction (Y) of the material with respect to its direction of advance (X); and if the cutting tool to which the part is assigned has been previously associated with a predefined group of parts (Gh), the comparison of a length (L) taken in the direction of the direction of advance of the material of a rectangle encompassing all the parts of the group and to which said part is added with a length (L) of a cutting window (Fi);
    if the length of the rectangle is less than the length of the cutting window, the assignment of the part to the predefined group of parts (G-h);
    if the length of the rectangle is greater than or equal to the length of the cutting window or if the cutting tool to which the part is assigned has not previously been associated with any predefined group of parts, the creation of a new group of parts (G-h + 1) associated with the cutting tool and a new cutting window (F-i + 1) and the assignment of the part to the new group of parts.
    [3" id="c-fr-0003]
    3. Method according to claim 2, in which the allocation of the parts to one of the cutting tools comprises:
    partitioning of the placement of the pieces in the direction of a width of the partitioning as a function of the number of separate cutting tools used to cut the pieces, partitioning of the placement resulting in adjacent placement zones having the same width and each associated with a single cutting tool; and assigning each piece of placement to one of the placement areas based on the cross position of the piece.
    [4" id="c-fr-0004]
    4. Method according to claim 3, wherein, prior to the allocation of each placement piece to one of the placement areas, the pieces are sorted in ascending order according to a longitudinal position (Xmin) of said pieces taken along the feed direction of the material.
    [5" id="c-fr-0005]
    5. Method according to any one of claims 2 to 4, wherein the transverse position (Yc) of a part corresponds to a position of the geometric center of a rectangle (B-i) of smaller dimensions encompassing the part.
    [6" id="c-fr-0006]
    6. Method according to any one of claims 1 to 5, in which the step of applying spacings between the different groups of parts comprises applying to each part of the same group of parts the same offset. longitudinal (DX) along the direction of advance of the material and the same transverse offset (DY) along the direction transverse to the direction of advance of the material.
    [7" id="c-fr-0007]
    7. The method of claim 6, wherein the longitudinal offset applied to each part of the same group depends on the cutting window and the cutting tool with which the group of parts is associated.
    [8" id="c-fr-0008]
    8. Method according to any one of claims 1 to 7, further comprising, after the step of applying spaces between the different groups of parts, the automatic identification of possible overlapping zones (Ch) between parts from different parts groups and the correction of these overlapping areas.
    [9" id="c-fr-0009]
    9. Method according to any one of claims 1 to 8, in which the predetermined placement of the parts in the material corresponds to an optimized placement calculated automatically to minimize material losses.
    [10" id="c-fr-0010]
    10. Use of the method according to any one of claims 1 to 9 for the partitioning of a predetermined placement of reinforcing parts for airbags intended to be cut from a material.
    [11" id="c-fr-0011]
    11. Computer program comprising instructions for the execution of the steps of the method of partitioning a predetermined placement of parts according to any one of claims 1 to 9.
    [12" id="c-fr-0012]
    12. Recording medium readable by a computer on which a computer program is recorded comprising instructions for the execution of the steps of the method of partitioning a predetermined placement of parts according to any one of claims 1 to 9.
    1/6 p
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    法律状态:
    2017-11-20| PLFP| Fee payment|Year of fee payment: 2 |
    2018-06-22| PLSC| Publication of the preliminary search report|Effective date: 20180622 |
    2018-11-27| PLFP| Fee payment|Year of fee payment: 3 |
    2019-11-20| PLFP| Fee payment|Year of fee payment: 4 |
    2020-11-20| PLFP| Fee payment|Year of fee payment: 5 |
    2021-11-18| PLFP| Fee payment|Year of fee payment: 6 |
    优先权:
    申请号 | 申请日 | 专利标题
    FR1662692|2016-12-16|
    FR1662692A|FR3060432B1|2016-12-16|2016-12-16|METHOD FOR PARTITIONING A PREDETERMINED PLACEMENT OF PIECES INTENDED TO BE CUTTED IN A FLEXIBLE SHEET MATERIAL|FR1662692A| FR3060432B1|2016-12-16|2016-12-16|METHOD FOR PARTITIONING A PREDETERMINED PLACEMENT OF PIECES INTENDED TO BE CUTTED IN A FLEXIBLE SHEET MATERIAL|
    CN201780076824.9A| CN110291543A|2016-12-16|2017-11-29|The method for dividing the predetermined arrangement of component to be cut in flexible sheet material|
    PCT/FR2017/053282| WO2018109301A1|2016-12-16|2017-11-29|Method for partitioning a predetermined placement of parts intended to be cut in a flexible sheet material|
    JP2019530457A| JP7030120B2|2016-12-16|2017-11-29|A method of dividing a predetermined arrangement of parts to be cut in a flexible sheet material|
    KR1020197016479A| KR20190094169A|2016-12-16|2017-11-29|Method for dividing a predetermined arrangement of parts intended to be cut from flexible sheet material|
    MX2019007029A| MX2019007029A|2016-12-16|2017-11-29|Method for partitioning a predetermined placement of parts intended to be cut in a flexible sheet material.|
    EP17816932.2A| EP3555821B1|2016-12-16|2017-11-29|Method for partitioning a predetermined placement of parts intended to be cut in a flexible sheet material|
    US16/470,430| US11090828B2|2016-12-16|2017-11-29|Method for partitioning a predetermined placement of parts intended to be cut in a flexible sheet material|
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