• 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 verifying modifications in the folding of sheet metal parts comprising digitizing the sheet metal part and transforming the digitized geometry into a plurality of part points and surface polygons of n sides that are obtained from a plurality of contours in each surface and that are dependent on the minimum detail of the piece and verify the modifications in the folding of the piece of cold stamped sheet based on the set of piece points and surface polygons obtained from the initial real piece. (Machine-translation by Google Translate, not legally binding)
    公开号:ES2651196A1
    申请号:ES201631010
    申请日:2016-07-22
    公开日:2018-01-24
    发明作者:Cristina MARTÍN DOÑATE；Miguel Ángel RUBIO PARAMIO；Antonio VIZÁN DOIPE；Jorge Manuel MERCADO COLMENERO
    申请人:Universidad Politecnica de Madrid；Universidad de Jaen；
    IPC主号:
    专利说明:

    Method of automated verification of modifications in the folding of cold stamped sheet metal parts
    Object of the invention
    The present invention relates to the technical field of the verification systems of modifications in parts made by cold stamping on sheet metal for the purpose of manufacturing.
    Background of the invention
    Throughout the life cycle of an industrial product and more specifically of a piece 15 made by cold stamping for sheet metal, it undergoes small changes in its geometry for several reasons:
    The piece can be applied to a different product for which it was designed Optimization of geometry to reduce costs
    20 Change of geometry to avoid overlapping with other patents
    One can think a priori that these small changes do not influence the manufacture of
    the piece, however once the contract with the client is signed, the errors in the verification
    Manufacturing can lead to huge costs for the manufacturer.
    25 When conducting price studies or budgets, time is of the essence if you want to get a contract. For this reason the budgets are made by experts who analyze the piece assessing the changes based on their extensive experience. On certain occasions the expert may not be available, in this case the company must park the
    30 valuation for not having a method that allows to verify these changes in the real part in an automated way.
    In the cold stamping process the piece is manufactured using a tool called stamping. The fixed part is called the matrix while the mobile part is called a punch.
    35 This is driven by powerful hydraulic presses. The process consists of placing the sheet to be stamped on the matrix and pressing it through the punch until the piece
    Take the desired shape. These operations performed by both parts of the stampThey require conditions of accessibility to the area to be manufactured. The accessibility isdirectly related to the folding angle of the piece, that a small change inDesign may vary. In the design of sheet metal parts, small related changes5 with the folding of the piece make it necessary to verify the possibility of its manufacture.
    Patent application JP-2009119716 describes a system to automatically analyze
    the presence of zones does not manufacture bias in 3D parts during its design, by means
    non-moldable zone determinants that determine a surface that presents
    10 points, calculating normal lines.
    Patent application US20030083773 provides a method to simulate the contour of
    a work piece that is determined by generating a set of lines parallel to the Z axis
    that intersect with the piece.
    US patent application 8,296,097 82 presents an element-based technique instead
    of characteristics, including the calculation of a normal line to each surface of the piece and
    the ana lysis of all these lines.
    20 However, all the methods described above have limitations in terms of functionality, accuracy, complexity in the resolution or initial data collection. In short, there is still a need in the state of the art for an automated verification method of the modifications in the folding of parts by means of a cold stamping process using as a material the metal sheet capable of adapting to any
    25 geometry of the piece and provide precision on the verification of its manufacture based on the geometry of the real piece.
    Description of the invention
    The object of the present invention is to overcome the drawbacks of the state of the art by means of an automated verification method of modifications in the folding of cold-stamped sheet metal parts comprising, digitizing a part by means of a scanner-type measuring means or other physical means that allows obtaining the necessary information and transforming the geometry obtained, into a set of part points and surface polygons
    35 with a plurality of sides characterized in that it comprises: Incorporating first data identifying the geometric digitized definition of the real three-dimensional object in a data file, second data representing the minimum detail dimension of the real three-dimensional object in a second data file , third data corresponding to the number of sides of the analysis polygons in a third file of
    5 data
    A first stage of digitalization of the real object to obtain its geometry and information
    on it, by means of a suitable device for this purpose. The actual object may have
    been manufactured through any manufacturing process.
    A second stage of transformation of the geometry into a plurality of piece points located on the geometry separated from each other the distance corresponding to the minimum detail of the piece and in a set of surface polygons with a plurality of sides obtained from the union of these vertices
    Through a process that includes:
    Measure the length of the minimum detail of the real piece and enter its value by the user.
    20 Create n contours parallel to each outer contour for each part surface separated from each other a distance equal to the minimum detail of the piece.
    Divide each contour into a plurality of segments equal to the length of the minimum detail of the piece and equal to each other.
    Place a Pi piece point at the end of each segment.
    Join the plurality of Pi piece points forming two Poi Poles according to the 30 number of sides selected
    A third stage of organization of the surface points comprising:
    Classify the Pi piece points according to their coordinate in a coordinate system
    Cartesian, consisting of a first axis corresponding to the direction of displacement of the punch, as well as a second and a third axis preferably perpendicular to the main stamping direction.
    - Store the classification of Pi part points in sub-levels within a matrix.
    5 -Assign a Pli plane perpendicular to the direction of displacement of the punch, for each sublevel.
    A fourth stage of classification of surface polygons according to their manufacturing comprising:
    Place the Poi polygons with respect to the different sub-levels of the matrix, according to the height of their vertices grouping in each sub-level all those polygons that have a vertex in the analyzed sub-level.
    15 Do not duplicate the analysis of polygons that have been previously analyzed in a previous sub-level
    A fifth stage of cataloging that includes:
    20 Create a surface If with the surface polygons belonging to each sub-level i.
    Project the surface If on the plane corresponding to each sub-level i.
    Obtain the projected surface contour If on the analysis plane i, 25 adding for each sub-level the projected contours of the previous sub-levels.
    Perform a scan in the manufacturing direction of the part, which includes cataloging for each sub-level the set of surface polygons of the part that are below the sub-level analyzed according to a plurality of manufacturing criteria comprising:
    - Catalog as a fabricable surface polygon, those polygons of the piece in which all of its vertices are outside or on the projected contour of the Si surface of a higher sublevel.
    - Catalog as non-fabricable surface polygon, those polygons of the piece in which all the vertices are within the contour

    of the surface Si of a higher sublevel.
    -Conside as a partially fabricable surface polygon, thosepolygons of the piece that have any of its vertices within the contour5 projected Yes from a higher sublevel
    Catalog the surface polygons belonging to the first sub-level of the classification matrix as a bias factory
    10 A sixth stage of scanning in the direction of stamping of the piece but in the opposite direction to that carried out in the fourth stage and of repetition of the stages of organization of surface points, location of polygons according to their manufacture and cataloging of surface area polygons the part according to its manufacture in the direction of travel of the matrix comprising
    Compare the polygons cataloged in the fourth stage with those classified in the
    fifth stage applying priority criteria in reference to manufactures polygons
    of the fourth stage.
    20 A seventh stage of final grouping of the polygons of the surface of the piece into fabricable surface polygons, non-fabricable surface polygons and partially fabricable surface polygons, according to the results of the fourth and fifth cataloging stages comprising:
    25 Join the fabricable part surface polygons on an Sfab surface.
    Calculate the intersection between the manufactured surface Sfab and each surface polygon classified as partially manufactured in the fourth and fifth stages.
    Divide partially fabricable surface polygons into surface subpolygons
    30 manufactures and surface polygons do not manufacture bias depending on their location with respect to Sfab.
    Determine the total surface of the non-manufactured part by joining the non-manufactured sub-polygons to the non-manufactured area SnFab
    An eighth stage in which the piece is manufactured by a cold stamping process for sheet metal based on the results obtained in the previous stages.
    Description of the figures
    In order to help a better understanding of the characteristics of the invention according to a preferred example of practical realization thereof, and to complement this description, the following figures are attached as an integral part thereof, the character of which is illustrative and not limiting:
    Figure 1 shows the initial real part and Figure 2 the initial real part to which a modification has been included.
    Figure 3 shows the contours parallel to each outer contour of each part surface.
    Figure 4 shows the location of the piece points on the ends of each 15 segment
    Figure 5 shows the mode of formation of the Poi surface polygons
    Figure 6 exemplifies the case of three-sided surface polygons and Figure 7 the case of 20 four-sided surface polygons.
    Figure 8 shows the classification of points according to their dimension according to a Cartesian coordinate system for level i
    25 Figure 9 exemplifies the location of the surface polygons for the analysis of the sub-level i of the matrix with the membership criteria for those polygons that have a vertex at this sub-level.
    Figure 10 shows the projection of the Si surface on the plane perpendicular to the corresponding manufacturing direction
    Figure 11 indicates the classification of fabricable surface polygons, does not manufacture biases and partially fabricable surface polygons for the example piece.
    35 Figure 12 presents an example of the application of the subdivision of semi-fabricable polygons.

    Figure 13 shows the Snfab surface for the part of figure 2.
    Figure 14 shows the surface Sfab for the part of figure 1.
    Preferred Embodiment of the Invention
    Figure 1 shows a real initial piece and Figure 2 a real initial piece to which a modification has been included.
    In a preferred embodiment, the geometry of the modified initial real part is digitized by means of a suitable measuring device for this purpose and transformed into a plurality of Pi part points located on its geometric surface, drawing a plurality of contours parallel to the outer contour of each surface with a separation equal to the
    15 distance corresponding to the minimum detail of the piece. These contours are further subdivided into segments of length equal to the minimum detail. At the end of each segment there is a piece point, representative of the geometry of the real piece.
    Subsequently, the points are joined by straight lines forming a plurality of 20 sided surface polygons, called surface polygons that will serve as the basis for the verification of the workmanship of the piece.
    In Figure 3 you can see the contours parallel to each outer contour of each surface of the piece as well as the division of each contour into n segments equal to the length of the minimum detail of the piece. The location of the piece points on the ends of each segment is indicated in Figure 4.
    Figure 5 shows the mode of formation of the surface polygons Poi joining the points located on the surface of the piece, using straight lines. Figure 6 shows the case
    30 of three-sided surface polygons and Figure 7 the case of four-sided surface polygons.
    Figure 8 shows how, the Pi points are classified according to their dimension according to a Cartesian coordinate system formed by a first axis corresponding to the
    35 direction of travel of the printing punch as well as a second and third axis preferably perpendicular to the main printing direction, the classification of points being subsequently stored in different sub-levels within a matrix.
    Each sub-level of the classification is assigned a Pli plane perpendicular to the manufacturing direction of the piece.
    Next, all the surface polygons of the piece are located, in the different sub-levels of the matrix, according to the dimension value of their vertices. Those polygons that have a vertex with the level of the analyzed sub-level are grouped in the same sub-level, not re-analyzing those polygons that have already been analyzed in a previous sub-level.
    10 Figure 9 shows the location of the polygons with respect to the sub-level i of the matrix grouping those polygons that have a vertex in this sub-level.
    After the assignment of the part polygons to the different sub-levels of the matrix, a Si surface is created for each sub-level. Each surface If it is formed with all polygons 15 belonging to each sub-level i. For each sub-level, the Si surface is projected on the plane perpendicular to the manufacturing direction corresponding to sub-level i as indicated in Figure 10. To the surface If the projected contours of the previous sub-levels are added for each sub-level. A sweep is made in the direction of manufacture of the piece evaluating for each sub-level and the set of polygons of the piece that are found by
    20 below the sub-level analyzed, and applying a set of manufacturing criteria that include:
    Consider as an area of the surface of the fabricable piece, that corresponding to the surface of those polygons that have all their points outside the contour of the Si surface of an immediately higher level.
    Consider as an area of the surface of the non-manufactured part, that corresponding to the surface of those polygons that have all their points within the contour of the surface Si of an immediately higher level.
    Consider as part of the surface of the partially manufactured part the one corresponding to the surface of those polygons that have any of their points within the projected contour If of an immediately higher level
    35 The surface polygons are classified in different areas in relation to the verification of their manufacture in the workable area of the workpiece, the non-workable area of the workpiece and the semi-fabricated area.
    Next, a reverse scan is performed comparing the polygons
    classified in the first sweep and applying priority criteria in reference to
    manufactured polygons in the first sweep.
    After performing the reverse scanning, the surface polygons are classified into three blocks: fabricable surface polygons, non-fabricable surface polygons and partially fabricable surface polygons. Figure 11 indicates the classification of polygons for the example piece.
    The polygons surface of the piece classified as manufactures are joined in a surface
    Sfab, later calculating the intersection between the Sfab surface and each polygon
    surface classified as partially manufactured
    15 Partially manufactured sub-polygons are divided into surface sub-polygons that do not manufacture bies and surface sub-polygons that can be manufactured as a function of their position with respect to Sfab.
    20 Next, the total supertice of the non-fabricable part is determined by joining the sub-polygons with a non-manufactured surface to the non-fabricable Snfab zone. Figure 13 shows the surface Sfab for the modified real part of figure 2. Figure 14 shows the surface Sfab for the real part of figure 1.
    In a preferred embodiment, the part is manufactured based on the results obtained in the previous steps.
    权利要求:
    Claims (2)
    [1]
    . Method of verifying modifications in the folding of sheet metal parts, which
    5 It includes digitizing the real piece to obtain its geometry, transforming the
    geometry obtained in a plurality of part points and surface polygons with a
    plurality of sides, with vertices at the part points and sides formed by straight lines
    union between vertices and verify the manufacturing of the real piece based on the points
    piece and polygons, characterized in that it comprises:
    10 2.
    incorporate first data that identify the geometric digitized definition
    of the real three-dimensional object in a data file, second data that
    they represent the dimension of the minimum detail of the piece in a second file of
    data and third data corresponding to the number of sides of the polygons in a
    fifteen Third data file.
    a first stage of digitization of the real piece to obtain its geometry
    a second stage of transformation of geometry into a set of
    points called piece points, separated from each other the distance corresponding to the
    minimum detail of the piece and in a set of surface polygons with a
    twenty plurality of sides obtained from the union of these piece points
    a third stage of organizing the piece points in which they are
    classified according to the value of its dimension with respect to a coordinate system
    Cartesian, consisting of a first axis corresponding to the direction of
    offset of the stamping die, as well as a second and a third axis
    25 preferably perpendicular to the main stamping direction being
    stored in sub-levels within a matrix after classification.
    a fourth stage of localization of surface polygons according to their manufacturing
    in which the polygons are located with respect to the different sub-levels of the
    matrix, according to the height of its vertices grouping all those polygons that
    30 have a vertex in each sublevel without re-analyzing the polygons that have
    previously analyzed in a previous sub-level
    a fifth classification stage in which a plurality of surfaces are created
    If with the polygons belonging to each sublevel and those belonging to
    previous sub-levels, projecting the surfaces on individual Pli planes
    35 perpendicular to the manufacturing direction, obtaining the contour for each
    sublevel, sweeping the manufacturing direction of the piece, evaluating
    for each sub-level the set of polygons of the piece that are found by
    below the sub-level analyzed according to manufacturing criteria.
    a sixth stage of scanning in the direction of manufacture of the piece but in
    inverse sense to the one realized in the fifth stage and of repetition of the stages of
    5 organization of points of the superstore, location of polygons according to their
    manufacture and classification of the surfaces of the piece according to its manufacture in the
    matrix offset direction
    a seventh stage of final grouping of the surface polygons of the
    piece in fabricable surface polygons, non-fabricable surface polygons and
    10 partially fabricable surface polygons, according to the results of the
    fifth and sixth stages.
    an eighth stage of manufacturing the piece according to the results obtained in
    The seventh stage.
    fifteen 2.Verification method according to claim 1 characterized in that the second
    Transformation stage of the geometric definition of the object comprises:
    Create n contours parallel to each outer contour of each surface of the
    piece separated from each other a distance equal to the minimum detail of the piece.
    Divide each contour into a plurality of segments equal to the length of the
    twenty minimum detail of the piece and equal to each other.
    Place a point at the end of each segment.
    Join the points forming two polygons according to the number of sides
    selected
    25 3.Verification method according to claims 1 and 2 characterized in that the
    Manufacturing criteria in the fifth stage include:
    Consider as a surface area of the fabricable part, the
    corresponding to the surface of those polygons that have all their points
    outside the surface contour If of an immediately higher level.
    3 0 Consider as a surface area of the non-fabricable part, the
    corresponding to the surface of those polygons that have all their points
    within the surface contour If of an immediately higher level.
    Consider the surface area of the partially manufactured part as the
    corresponding to the surface of those polygons that have any of their
    35 points within the projected contour If of an immediately higher level
    [4]
    Four. Verification method according to claims 1 to 3 characterized in that the
    sixth stage includes:
    Compare the polygons classified in the fifth stage with those classified in
    the sixthstageapplyingcriteriafrompriorityinreferencetothepolygons
    5 manufactured from the third stage.
    Sort the polygons of the part surface in surface polygons
    manufactured, non-manufactured surface polygons and partially surface polygons
    manufactured.
    10 5.Verification method according toclaims 1 to 4 characterized in that the
    seventh stage stage comprises:
    Join the surface polygons of the piece classified as manufactured in a
    Sfab surface.
    Calculate the intersectionbetweenthe manufactured surface Sfab and each polygon
    fifteen surface classified as partially fabricable.
    Divide thesurface polygonspartiallyfabricableinsubpolygons
    surface.
    Sort surface subpolygons inpolygons surface manufactures bias and
    non-fabricable surface polygons based on their position relative to Sfab
    twenty Determine the surface of the non-manufactured part by joining the subpolygons not
    manufactures bies to the non-manufactured area SnFab
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    同族专利:
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    ES2651196B2|2018-04-18|
    引用文献:
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    US20030083773A1|2001-09-12|2003-05-01|Siemens Aktiengesellschaft|Visualization of workpieces during simulation of milling processes|
    US20110093106A1|2009-10-19|2011-04-21|Geometric Limited|Manufacturability Evaluation of Injection Molded Plastic Models Using a CAD Based DFX Evaluation System|
    ES2512940A2|2013-02-01|2014-10-24|Universidad De Jaén|Method of automated validation of the fabricability of designs of three-dimensional objects based on its geometry |
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