• 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 cutting die (12) of a sheet blank, comprising a body (14) with an extended surface (16) facing the sheet blank and with, on said surface, at least one cutting edge (18) of said blank; rolling elements (20) for guiding the remote sheet blank (22) of the cutting edges (18) for movement along said surface. The rolling elements (20) are movably mounted relative to the body (14) and subjected to an elastic force tending to move them away from the surface (16). The invention also relates to a punching tool comprising the cutting die (12), and the method implemented by such a tool.
    公开号:FR3020771A1
    申请号:FR1454115
    申请日:2014-05-07
    公开日:2015-11-13
    发明作者:Philippe Delacour；Didier Vourron
    申请人:Peugeot Citroen Automobiles SA；
    IPC主号:
    专利说明:

    [0001] The invention relates to the field of sheet metal stamping tools, in particular of a motor vehicle body sheet. The invention more particularly relates to the field of punching tooling of a sheet blank, more particularly to the means for feeding and cutting a blank sheet in such tools. A sheet blank is a metal sheet at the beginning or during manufacture, of small thickness, obtained by cutting, and intended to be stamped. Figure 1 is a view of a sheet blank 2 of a vehicle body side 4. It is possible to notice openings 6 made for the door openings, these openings are generally performed on punching tools by cutting the sheet blank 2. The blank of a sheet blank is generally made by a tool comprising a punch and a matrix, the cutting being done by shearing between two cutting edges thanks to a relative movement between the punch and the die. Punching tools are generally mounted in a stamping press that generates this relative movement. Feeding a sheet blank in a punching tool and for cutting is generally performed by lateral scrolling or by vertical removal on a die. Lateral scrolling of a sheet blank is an embodiment which generally offers a rate advantage, it is also generally less expensive than that by removal; it requires guidance systems that are generally relatively simple, but it may be a source of appearance of quality defects in the blank. For example, the sheet blank fed by scrolling on a cutting die can come into contact with sharp edges and present traces of friction or scratches. JP 3183735 B2 discloses a table configured for punching a sheet. The table comprises a series of articulated chains with cylindrical rollers whose rolling direction is oriented in the direction of movement of the sheet; the rolling of the rollers allowing the displacement of the sheet. The punch is small and is able to move in a direction orthogonal to the table. The rollers are present on the entire surface of the table and until the edge of the punch. This teaching is interesting as regards the support of the sheet precisely made up to an interface with a cutting tool, the ends of the chains forming the contour of the tool. This teaching is however limited to the scrolling of the sheet on a matrix comprising moving cutting edges retracting during scrolling. Patent document EP 1 422 006 A2 discloses a sheet punching machine comprising transport rollers extending transversely to the direction of movement of the sheet. A punch and a punching die are located on each side of the sheet to form the sheet, these tools move vertically towards each other during shaping, the sheet remaining fixed. This solution is interesting in that it is simple and inexpensive. It is however relatively inflexible in its application by the size of the rollers.
    [0002] The object of the invention is to propose a solution for the production of a punching tool for a sheet blank, in particular a sheet blank for a motor vehicle body, the tooling remedying at least one of the disadvantages mentioned above. . More particularly, the invention aims to provide a solution for guiding and cutting a sheet blank of such a tool so as to reduce quality defects. The subject of the invention is a die for cutting a blank of sheet metal, comprising: a body with an extended surface facing the sheet blank and with, on said surface, at least one cutting edge of said blank ; means for guiding the sheet blank away from the surface in order to move it along said surface, characterized in that the guide means comprise a plurality of rolling elements mounted movable relative to the body and subjected to an elastic force tending to move them away from the surface. According to an advantageous embodiment of the invention, the distance between the sheet blank and the cutting edges may be between 0.5 mm and 25 mm, more preferably between 5 mm and 15 mm.
    [0003] According to an advantageous embodiment of the invention, the guide means are embedded in the body of the matrix. According to an advantageous embodiment of the invention, each of the rolling elements is adapted to be in contact with the sheet blank on a surface of between 5 mm 2 and 30 mm 2.
    [0004] According to an advantageous embodiment of the invention, the rolling elements are distributed over the extended surface at the rate of a number of elements between 0.2 and 2 per dm2. According to an advantageous embodiment of the invention, the rolling elements are arranged in line over a length of between 5 cm and 200 cm. According to an advantageous embodiment of the invention, the rolling elements are distributed generally uniformly over the extended surface, said elements being oriented so as to have a common running direction corresponding to the direction of movement of the sheet blank. According to an advantageous embodiment of the invention, the matrix comprises continuous cutting edges and / or discontinuous cutting edges, rolling elements being located between these cutting edges. According to an advantageous embodiment of the invention, each of the rolling elements is mounted on a pivoting arm on a fixed support relative to the body of the matrix, a spring being connected to each of said supports and arms, respectively. According to an advantageous embodiment of the invention, each of the rolling elements comprises a running surface intended to be in contact with the sheet blank, the section of said surface having a flat or rounded profile, said surface preferably being made of plastic or in felt. According to an advantageous embodiment of the invention, the rolling elements are configured to support the sheet blank away from the cutting edge or edges in the absence of external force on said blank and directed towards the surface of the die. According to an advantageous embodiment of the invention, the cutting edge or edges are remote from the extended surface. The invention also relates to a press punching tool for stamping a sheet blank comprising: a die with at least one cutting edge of the sheet blank; a presser adapted to clamp said blank against said die; one or more punch (s) movable (s) relative to the presser and adapted (s) to cooperate with the cutting edge or edges for punching, remarkable in that the matrix is in accordance with the invention.
    [0005] According to an advantageous embodiment of the invention, the die is movable and the punch is fixed, or the die and the punch are movable. According to an advantageous embodiment of the invention, the matrix comprises one or more blades forming the cutting edge (s) of the sheet blank, the said blade (s) being attached to one or more support (s) blade (s), the or said support (s) being fixed (s) on the extended surface of the body of the matrix, each of the rolling elements being attached to said surface of the body. The subject of the invention is also a process for cutting a sheet blank, in particular an automobile body sheet blank, which is remarkable in that it comprises the use of a tool according to the invention, the steps of the method comprising: a) feeding on the matrix of the sheet blank moving on the rolling elements away from the cutting edge or edges of the die; b) bringing the presser into contact with the sheet blank, and bringing said blank closer to the cutting edge (s) of the die; c) cutting the blank between the punch (s) and the cutting edge (s) of the die; d) removal of the presser and raising of the sheet blank; e) evacuation of the cut blank, said blank moving on the rolling elements at a distance from the cutting edge (s). The measurements of the invention are interesting in that the guiding of the sheet blank on the die and the cutting method used by the punching tool make it possible to overcome the quality defects related to the feed means by scrolling. Indeed, the rolling and mobile guide means on which the sheet blank can move, prevent contact with the cutting edges of the matrix during feeding, and they associate with the movement of the press for cutting. The realization of rolling and mobile guiding means is flexible which also reduces the cost.
    [0006] Other features and advantages of the present invention will be better understood with the help of the description and the drawings, among which: FIG. 1 is a view of a blank sheet of a motor vehicle body; FIG. 2 is a perspective view of a cutting die according to the invention, made for cutting the sheet blank of FIG. 1; FIG. 3 is a perspective view of a guiding means for the matrix of FIG. 2; - Figure 4 is a sectional view IV-IV of the punching tool according to the invention, the tool being shown at the beginning of the step of the cutting method according to the invention; - Figure 5 is a sectional view of the punching tool of Figure 4, at an intermediate step of the cutting method according to the invention; - Figure 6 is a sectional view of the punching tool of Figure 4, at another intermediate step of the cutting method according to the invention; - Figure 7 is a sectional view of the punching tool of Figure 4, at a final step of the cutting process according to the invention; Figure 1 has been previously described in the context of the discussion of the prior art. It is possible to observe again for example the aperture cutouts 6 of door opening, wheel contour 8 or contour 10 at the roof level. These cuts are presented by way of example, they can be performed by the tooling that will be described below. Figure 2 is a perspective view of a die 12 for cutting a sheet blank (not shown), the die 12 being in accordance with the invention. The die 12 comprises a body 14 with an extended surface 16 facing the sheet blank. It comprises at least one edge 18 for cutting the sheet blank. The cutting edge (s) 18 may / may be located directly on the surface 16 of the body of the die, or at a distance from the surface 16. The die 12 comprises guide means with rolling elements 20 adapted to receive a blank of sheet metal for its displacement, the latter being effected at a distance 22 from the cutting edges 18. The displacement of the sheet blank takes place along the surface 16 of the matrix 12. can be seen to the right of the image a broken line joining the vertices of some rolling elements 20 and indicating in comparison with a cutting edge 18, the distance 22, according to which the sheet blank can scroll with respect to the cutting edges 18 of the matrix during the feeding of the blank. This distance 22 may be between 0.5mm and 25mm, more preferably between 5mm and 15mm. The matrix may also include lateral guiding elements 24 of the blank. The rolling elements 20 are movable relative to the body 14. The sheet blank scrolling on these rolling elements 22 can be positioned on the die 12 for the purpose of cutting. More precisely and in relation with the cutting method that will be presented below, the rolling elements 22 are configured to support the remote sheet blank 22 or cutting edges 18, and this in the absence of external force on said blank, a force which is directed towards the surface of the body 14.
    [0007] In a particular embodiment where the cutting edges are formed on the surface of the body, the tops of the rolling elements are then located at a distance 22 from the surface of the body, the rolling elements can thus be partially embedded in the body of the body. the matrix. FIG. 2 shows another particular embodiment of the invention, the die 12 comprising one or more blade supports 26, this or these blade (s) forming the cutting edge (s) 18 of the blank sheet metal; the rolling elements 20 can be reported, via a support, on the extended surface 16 of the body 14 of the matrix 12, which facilitates the production of the matrix 12. The rolling elements 20 can be distributed over the extended surface 16 at a rate of a number of elements between 0.2 and 2 per dm2. They are distributed generally uniformly over the extended surface 16, and oriented so as to have a common running direction, this direction represented by an arrow on the image corresponding to the direction of movement of the sheet blank. This rolling direction is in this case from left to right in the image. Each of the rolling elements 20 is adapted to be in contact with the sheet blank on an area of between 5 mm 2 and 30 mm 2. They can be arranged in line on a length between 5cm and 200cm. The distribution as well as the relatively small size of the rolling elements 20 make the production of the matrix more flexible, in particular at the narrow zones 28 of the matrix. On such areas the number of rolling elements is relatively low. The cutting edges 18 may be discontinuous, they may also be continuous as is in this case represented in the middle of the matrix on the image. A discontinuous cutting edge is capable of cutting inside the blank, it may also be able to perform a cutting of an edge of the sheet blank, such as for example the edges of the blank presented in relation to FIG. 1 A narrow zone 28 of the matrix where the number of rolling elements 20 is relatively small may be a zone between a continuous cutting edge and a discontinuous cutting edge. The reference 28 of the image has such a zone. Figure 3 is a perspective view of a rolling element 20 according to the invention. The rolling element 20 is mounted on an arm pivoting on a support 32 fixed relative to the body of the die (not shown), for example by means of one or more screws. The surface 16 of the body shown schematically in the image can be observed by a perspective plane, it can also be observed that the rolling element 20 is subjected to an elastic force tending to move it away from the surface 16; this effort is represented on the image by an arrow pointing upwards. Indeed elastic means 34 is connected to the support 32 and the arm 30 and is the source of this effort. In a particular embodiment of the invention, here represented in the image, the elastic element is a helical spring 34, a representation which in no way limits other embodiments of elastic means known to those skilled in the art. 'art. Figure 3 shows more precisely, the rolling element 20 which is movable between two positions 36 and 42. The first position 36 of the rolling element 20 is represented by a solid line; it corresponds to the rest position, waiting to receive a sheet blank. The contact surface 38 between the rolling element 20 and the sheet blank is at a first height 40 of the surface 16 of the die.
    [0008] The second position 42 of the rolling element 20 is represented by broken lines, it corresponds to the working position, the one where an external force (not shown) is applied to the sheet blank, this external force being directed towards the surface 16 of the body; we will see that this external force is related to the approach of the punch to the die in the cutting process, this method being described in detail below. The contact surface 38 between the rolling element and the sheet blank is then at a second height 44 of the surface 16 of the matrix. The position of the rolling element can also be that of the element at the time of its support sheet blank, and without additional external effort other than the weight of the blank, this position (not shown) is intermediate between the first and second positions previously described. Each of the rolling elements 20 comprises a rolling surface 46 intended to be in contact with the sheet blank, the section of said surface 46 may have a flat or rounded profile, this surface 46 may be plastic or felt. The contact surface 46 with the blank may also be covered with a coating to reduce friction with the blank. The rolling element may comprise a single or a double wheel 48. In this case, a double wheel 48 is represented in the image, the pivoting axis passing between the two wheels and being able to be mounted on a pivot axis (no shown) of both wheels. Each of the wheels may be metal and / or plastic. This embodiment of the mounting of a double wheel 48 on a pivoting arm 30 is known per se to those skilled in the art, this embodiment shown does not limit other possible embodiments of rolling elements 20. Figure 4 is a sectional view of punching tooling 50 press stamping. The tooling 50 comprises the matrix 12 seen in section IV-IV with respect to its representation in FIG. 2; A sheet blank 2 can be seen in position on the die 12 of the tooling 50. The die 12 comprises one or more cutting edge (s) 18 and one or more rolling element (s) 20 situated (s). ) around the cutting edges. The tooling 50 also comprises a presser 52 adapted to clamp the blank against the die, it finally comprises one or more punch (s) 54, movable (s) relative to the presser 52 and able (s) to cooperate with the or cutting edge (s) 18 for punching purposes. In another embodiment, the punch (s) can be fixed with a moving die. In yet another embodiment, the punch (s) and the die may be movable. Figures 4 to 7 show the different steps of the method of cutting a sheet blank 2, in particular a car body sheet metal blank, according to the invention. The method is implemented by the tooling 50 according to the invention and described in relation with FIG. 4. FIG. 4 is a view of the tooling 50 during the first step of the cutting method according to the invention . The sheet blank 2 is fed on the die 12 of the tooling 50, it can scroll laterally from left to right. In another embodiment, it may also scroll in the opposite direction. The blank 2 is supported by the rolling elements 20 fixed on the die 12. Two rolling elements 20 and supporting the blank 2 are shown, for example, one to the left and one to the right of the cutting edge 18 of the matrix. They schematize the support points that all the rolling elements 20 of the matrix 12 have to support the sheet blank 2. It can be observed that the axis of rotation of each of the rolling elements 20 is oriented perpendicular to the direction of movement of the blank. It can also be observed that the blank 2 is at a distance 22 from the cutting edge or edges 18, in this case a continuous edge is represented in the image, it is capable of producing an orifice of the type, for example, that shown in relation to FIG. 1. FIG. 5 is a view of the tooling 50 during the second step of the cutting method according to the invention. This step corresponds to the descent of the head of the stamping press (not shown), this descent generating the contact of the presser 52 with the sheet blank 2, then its approach to the contact between the blank sheet 2 and the or the cutting edge (s) 18 of the die 12. At this step, the presser 52 exerts a force on the sheet blank 2 directed towards the surface of the body of the die 12; this force is necessary for the pivoting of the support arms of each of the rolling elements 20, this force in fact exceeding those exerted by the return springs of the rolling elements 20. At this stage, the rolling elements 20 are in the second position described in relation to FIG. 6 is a view of the tooling 50 during the third step of the cutting method according to the invention. This step is that of the cutting of the sheet blank 12 between the punch (s) 54 and the cutting edge (s) 18. The rolling elements 20 remain in the same position as that described in relation with the previous step. The punch 54 is movable relative to the presser 52; this mobility can be achieved by a spring 56, the different embodiments of the tooling 50 allowing mobility between the punch 54 and the presser 52 are in themselves well known to those skilled in the art. Figure 7 is a view of the tool 50 in the fourth step of the cutting method according to the invention. This step corresponds to the rise of the stamping press head. This raising causes the extraction of the punch 54 of the die 12 as well as the removal of the presser 52. The presser no longer exerting external force on the sheet blank 2, the return forces of the springs of the rolling elements 20 are able to extract the sheet blank 2 from the cutting edges 18 of the die 12, and also able to raise it. This step also comprises, after the rise of the presser 52, the evacuation of the cut sheet blank, the blank moving on the rolling elements 20 again at a distance 22 from the cutting edge (s) 18.
    权利要求:
    Claims (10)
    [0001]
    REVENDICATIONS1. Cutting die (12) of a sheet blank (2), comprising: - a body (14) with an extended surface (16) facing the sheet blank (2) and with, on said surface at least one cutting edge (18) of said blank; - Guide means (20) of the sheet blank (2) at a distance (22) from the surface (16) for its displacement along said surface; characterized in that the guide means comprise a plurality of rolling elements (20) mounted movable relative to the body (14) and subjected to an elastic force tending to move them away from the surface (16).
    [0002]
    2. Matrix (12) according to claim 1, characterized in that each of the rolling elements (20) is adapted to be in contact with the sheet blank (2) on a surface between 5mm2 and 30mm2.
    [0003]
    3. Matrix (12) according to one of claims 1 and 2, characterized in that the rolling elements (20) are distributed over the extended surface (16) due to a number of elements (20) between 0 , 2 and 2 by dm2.
    [0004]
    4. Matrix (2) according to one of claims 1 to 3, characterized in that the rolling elements (20) are distributed generally uniformly over the extended surface (16), said elements (20) being oriented to present a common running direction corresponding to the direction of movement of the sheet blank (2).
    [0005]
    5. Matrix (12) according to one of claims 1 to 4, characterized in that each of the rolling elements (20) is mounted on an arm (30) pivoting on a fixed support (32) relative to the body of the matrix (12), a spring (34) being connected to each of said supports (32) and arm (30), respectively.
    [0006]
    6. Matrix (12) according to one of claims 1 to 5, characterized in that each of the rolling elements (20) comprises a rolling surface (46) intended to be in contact with the sheet blank (2), the section of said surface having a flat or rounded profile, said surface (46) being preferably made of plastic or felt.
    [0007]
    7. Matrix (12) according to one of claims 1 to 6, characterized in that the rolling elements (20) are configured to support the sheet blank (2) at a distance (22) from the edge (s) of cutting (18) in the absence of external force on said blank and directed towards the surface (16) of the matrix (12), said cutting edge (s) (18) being preferentially away from the extended surface (16).
    [0008]
    8. Punching tool (50) for stamping a sheet blank comprising: - a die (12) with at least one cutting edge (18) of the sheet blank (2); a presser (52) capable of clamping said blank (2) against said die (12); - One or more punch (s) (54), movable (s) relative to the presser (52) and adapted (s) to cooperate with the cutting edge (s) (18) for punching purposes; characterized in that the matrix (12) is according to one of claims 1 to 7.
    [0009]
    9. Tooling (50) according to claim 8, characterized in that the matrix (12) comprises one or more blade (s) forming the cutting edge (s) (18) of the sheet blank (2), the or said blade (s) being attached to one or more support (s) (26) of blade (s), the said support (s) being fixed (s) on the extended surface (16) of the body (s) ( 14) of the matrix (12), each of the rolling elements (20) being attached to said surface (16) of the body (14).
    [0010]
    10. A method of cutting a sheet blank (2), in particular a sheet blank (2) of automobile body, characterized in that it comprises the use of a tool (50) according to one Claims 8 and 9, the process steps comprising: a) feeding on the die (12) of the sheet blank (2) moving on the rolling elements (20) at a distance (22) from the edge (s) of cutting (18) the die (12); b) bringing the presser (52) into contact with the sheet blank (2) and bringing said blank (2) closer to the cutting edge (s) (18) of the die (12); sheet metal (2) between the punch (s) (54) and the cutting edge (s) (18) of the die (12); d) removal of the presser (52) and raising of the sheet blank (2); e) evacuation of the cut sheet blank (2), said sheet blank moving on the rolling elements (20) at a distance (22) from the cutting edge (s) (18).
    类似技术:
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    同族专利:
    公开号 | 公开日
    FR3020771B1|2016-12-23|
    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
    JPS6241416U|1985-08-28|1987-03-12|
    JPH06179024A|1992-12-09|1994-06-28|Murata Mach Ltd|Table structure of metal sheet machine|
    JP2000033436A|1998-07-15|2000-02-02|Sumitomo Metal Ind Ltd|Method and device for piercing position detection hole of steel strip|
    EP1422006A2|2002-11-22|2004-05-26|Mabi Ag|Machine for processing metal sheets|FR3056423A1|2016-09-27|2018-03-30|Peugeot Citroen Automobiles Sa|ALLEGED LIFTING TABLE FOR CUTTING OR SHEARING TOOLS|
    FR3072893A1|2017-10-27|2019-05-03|Psa Automobiles Sa|PUNCHING TOOL OF A TIN FLAN AND PUNCHING METHOD USING SUCH A TOOL|
    FR3078905A1|2018-03-15|2019-09-20|Psa Automobiles Sa|MODULAR TOOL FOR CUTTING FLANKS OF TOLE|
    FR3097455A1|2019-06-21|2020-12-25|Psa Automobiles Sa|Sheet metal cutting press tool and method of manufacturing such a tool|
    法律状态:
    2015-04-22| PLFP| Fee payment|Year of fee payment: 2 |
    2015-11-13| PLSC| Search report ready|Effective date: 20151113 |
    2016-04-22| PLFP| Fee payment|Year of fee payment: 3 |
    2017-04-21| PLFP| Fee payment|Year of fee payment: 4 |
    2018-04-23| PLFP| Fee payment|Year of fee payment: 5 |
    2018-06-29| CD| Change of name or company name|Owner name: PEUGEOT CITROEN AUTOMOBILES SA, FR Effective date: 20180312 |
    2018-06-29| CA| Change of address|Effective date: 20180312 |
    2019-04-18| PLFP| Fee payment|Year of fee payment: 6 |
    2020-04-22| PLFP| Fee payment|Year of fee payment: 7 |
    2021-04-21| PLFP| Fee payment|Year of fee payment: 8 |
    优先权:
    申请号 | 申请日 | 专利标题
    FR1454115A|FR3020771B1|2014-05-07|2014-05-07|GUIDING A FLAN OF TOLE ON A CUTTING MATRIX|FR1454115A| FR3020771B1|2014-05-07|2014-05-07|GUIDING A FLAN OF TOLE ON A CUTTING MATRIX|
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