• 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:
    Thermoforming mold device comprising two mold parts (3 and 3 ') for defining an opening state and a mold closing state, a first (3) of the two mold parts (3, 3') having suction means (5) for pressing the sheet (2 ') against its working surface (4), and comprising, on the one hand, a main suction means (5') and on the other hand, minus a secondary suction means (5 ") adapted and intended to generate a suction at a particular limited area (6 ') of said working surface (4), this at least partially independently of the means main suction device (5 ') A mold device (1) characterized in that the second mold part (3') has a hollow forming insert (7) arranged so as to be located when the mold is closed directly opposite the particular limited area (6 ') of the working surface (4) of the first mold part ( 3), the secondary suction means (5 ") being controllable independently of the main suction means (5 ').
    公开号:FR3044953A1
    申请号:FR1562151
    申请日:2015-12-10
    公开日:2017-06-16
    发明作者:Marc Saelen
    申请人:Reydel Automotive BV；
    IPC主号:
    专利说明:

    DESCRIPTION
    The present invention relates to the field of the production of trim elements or interior trim of motor vehicles, more particularly the elements of this type comprising or consist of a sheet or plate of thermoplastic material, suitably shaped and with or without a raised pattern, formed in the mass. The invention more specifically relates to a mold device for manufacturing by negative pressure forming of parts from sheets or plates, and a manufacturing method using this device and a packing member obtained by this method.
    Different methods of manufacturing parts by negative pressure forming (better known under the English designation "Negative Vacuum Lorming") are already known in the state of the art (see for example: LR 2 900 862, US 2013/0221698). Generally, in this type of process, a plastic sheet or plate is preheated, then placed between two mold parts (or half-molds) which preform during closure and, after complete closure of the mold, a relative vacuum is applied at the mold part coming into contact with the visible face of the workpiece, to achieve the final forming of the workpiece. Optionally during pressing under pressure due to the surface suction, a pattern in relief or graining is made on the visible surface (negative pattern present on the mold part subjected to suction).
    This vacuum forming method has many advantages among which include an excellent quality of the pattern and deformations that must include the visible surface, and a precise location of the latter. Nevertheless, when the pattern has to be changed, even locally, and / or if one or more particular deformations are (are) expected, for example for different versions of the same piece, it is necessary to have as many mold parts (at least for the visible side) as versions of the part, even if some of these versions differ from each other only in minor or local differences (change in size or shape of a recess in the housing of an accessory, management of the presence / absence of locally deformed zones, creation of sketches of mounting zones or anchoring of equipment or decorative elements salient, ...)
    In addition, the necessary replacement of the mold parts between two different versions of the same part of the production phase reduces the efficiency and productivity of the tools and personnel and requires the acquisition of specific means allowing a rapid change of parts of the mold.
    In current practice, the negative thermoforming of a skin or a piece of thermoplastic material is generally carried out using a mold portion in the form of a nickel shell having tiny holes allowing the evacuation of the air between the sheet to be formed and to print and said shell. The depression exerted by this vacuum allows the shaping and etching of the grain of the sheet. This shell is made in one piece by electroplating. It is extremely difficult or impossible to have an additional part without the joint between the two shell parts being visible on the part produced. If we therefore want optional structures such as housing for a decorative rod, aerators, start buttons, it is currently imperative to have as many different shells as optional versions.
    In an attempt to overcome this limitation, the Applicant has developed a first solution in which the complementary mold part (with respect to the mold-shaped mold part producing the negative thermoforming) is equipped with a hollow local forming part, mobile and connected to a source of vacuum or suction.
    During its activation, following the general thermoforming of the sheet heated by suction against the first mold part, this forming part creates with the sheet, which is in a state allowing its plastic deformation, a suction cavity making the local deformation desired.
    This solution is described in the European patent application No. 15305881.3 in the name of the applicant. Although this solution is satisfactory, it has been found that under certain conditions, in particular according to the sequencing of the process, the type of material of the sheet and / or the thickness of the latter, the skin or preformed part treated by thermoforming negative, while it is not yet completely cooled and the suction on the side of the shell has been cut, (semi-freedom of the skin / part between the two mold parts), a withdrawal, with final dimensions of the resulting part less than the expected dimensions.
    The present invention is intended to overcome this disadvantage, by proposing a second solution in the aforementioned context. For this purpose, it relates to a thermoforming mold device for producing a thin-walled part from a sheet of thermoplastic material, said mold device comprising two mold parts with working surfaces of substantially complementary shapes and of which at least one of the parts is movable so as to define a state of opening and a state of closure of the mold, a first of the two mold parts having suction means for pressing the sheet against its work surface, the suction means comprising, on the one hand, a main suction means adapted and intended to generate a negative pressure or suction on a majority portion of the working surface of said first mold part and, on the other hand, at least one secondary suction means adapted and intended to generate a negative pressure or suction at at least a particular limited area of said trailing surface; at least partially independently from the main suction means, the mold device characterized in that the second mold part has at least one integrated zone or a hollow forming insert, said zone or part being arranged so as to be located, when the mold is closed, directly opposite or respectively to each particular limited area of the working surface of the first mold part, the or each secondary suction means being controllable, at least for stopping or for suspending the suction, independently of the main suction means. The invention also relates to a manufacturing method using the aforementioned mold device. The invention will be better understood, thanks to the following description, which refers to preferred embodiments, given by way of non-limiting examples, and explained with reference to the appended diagrammatic drawings, in which: FIGS. and IB are schematic views in side elevation and sectional view of a suction or negative pressure thermoforming mold device according to two embodiments of the invention; - Figure IC is a schematic sectional view of a first mold part forming part of a device as shown in Figure 1A or IB, according to a particular embodiment of the invention; FIGS. 2A to 2D, on the one hand, and FIGS. 4A to 4G, on the other hand, are diagrammatic views in section and in lateral elevation of a mold device as represented in FIG. 1B, illustrating the various steps consecutive operational operations for manufacturing a thin-walled part or skin in accordance with the method according to the invention, namely respectively without local deformation in recesses (FIGS. 2A to 2D) and with local deformation in recesses (FIGS. 4A to 4G); - Figure 3 is a sectional view of a part or skin obtained with the alternative embodiment of the method of Figures 2A to 2D; FIG. 5A is a sectional view of a part obtained with the variant embodiment of the method of FIGS. 4A to 4G and FIG. 5B is a view on a different scale of detail A of FIG. 5A, and FIGS. 6A to 6C are detail views, in side elevation and in section, illustrating three consecutive steps of an alternative embodiment. of the manufacturing method according to the invention, more particularly of the deformation and demolding phases, with the aid of a mold device as represented in FIG. 1B.
    Figures 1, 2 and 4 of the accompanying drawings show a thermoforming mold device for producing a piece or skin 2 wall 2 "thin from a sheet 2 of a thermoplastic material.
    Said mold device 1 comprises two mold parts 3 and 3 'with working surfaces 4, 4' of forms that are substantially complementary or not and of which at least one of the parts is movable so as to define a state of opening and a state of closure of the mold, a first 3 of the two mold parts 3, 3 'comprising suction means 5 for pressing the sheet 2' against its working surface 4 which ultimately forms the forming of the piece 2 by deformation under vacuum (general shape + relief pattern).
    The suction means 5 comprise, on the one hand, a main suction means 5 'adapted and intended to generate a negative pressure or suction on a majority portion 6 of the working surface 4 of said first mold part 3 and on the other hand, at least one secondary suction means 5 "adapted and intended to generate a negative pressure or suction at at least one particular limited zone 6 'of said working surface 4, this at least partially of independently from the main suction means 5 '.
    For the sake of simplification of the representations, the sealing means, vacuum suction and displacement of the mold parts 3 and 3 'are not shown in the accompanying figures or in part schematically in Figure IC.
    According to the invention, the second mold part 3 'comprises at least one integrated zone or a hollow forming insert 7, said zone or part 7 being arranged so as to be located, when the mold is closed, directly in with respect to the or respectively of each particular limited zone 6 'of the working surface 4 of the first mold part 3, the or each secondary suction means 5 "being controllable, at least for its stop or for the purpose of a suspension of the suction, independently of the main suction means 5 '.
    Thus, the invention provides a mold device 1 which selectively enables parts or skins 2 with or without local deformation zones 14 to be hollowed out, depending on the control of said device 1 and while retaining during this local deformation operation, an intimate holding of said skin or piece 2 against the first mold portion 3, at the majority portion 6 of the working surface 4, thus preventing any retraction or deformation of this skin or piece 2 in areas not subject to local deformation.
    When the sheet 2 'is preheated, the suction at the majority portion 6 of the working zone 4 will advantageously be maintained until complete solidification and freezing of the skin or part 2.
    Of course, the portion 6 and the zone (s) 6 'of the working surface 4 can be connected to a same source of suction or vacuum controlled by the control means of the mold device 1 (not shown) , with the interposition of at least one specific breaking means for feeding the or each zone 6 '(not shown). Alternatively, the portion 6 and the or each zone 6 'can also be connected to separate sources (Figure IC). Those skilled in the art easily understand that with the preceding arrangements, it is possible, with the same mold device 1, to make different versions of the same skin or part 2, namely: without any zone 14 locally deformed, with one or more zone (s) 14 present (s), or with all of the preceding zones 14, when a plurality of zones or parts 7 are provided and none, some or all are used during the manufacture of the piece or skin 2 concerned. In addition, these different versions can be manufactured in a desired order and chosen (or imposed by orders) without impacting productivity or performance in terms of parts produced, with the exception of the additional time required to achieve the deformation or deformations additional local. However, at least part of this time is in any case necessary to allow sufficient cooling of the freshly formed part 2 in the mold.
    According to a first embodiment of the invention, the or each secondary suction means 5 "and adapted and intended to generate a positive pressure or a blowing action at the or each particular limited zone 6 'of the working surface of the first mold part 3, so as to locally push the sheet 2 'or wall 2 "towards and into the zone or part 7.
    Thus, the or each local deformation of the sheet 2 'or wall 2 "of the part or skin 2 is obtained by a positive action produced by the first mold part 3, which can be connected to a suitable positive pressure source (alternately with a suction source for the particular limited area (s) 6 '), the second mold part 3' being devoid of any active means of forming or deformation.
    According to an advantageous embodiment of the invention, apparent from Figures 1, 2 and 4 in particular, the first mold part 3 comprises a multiperforated or porous wall 8 permeable to gases, providing the working surface 4 of said part 3, a main suction chamber 9 and at least one secondary suction chamber 9 ', said chambers 9 and 9' being located on the side of the wall 8 opposite to the working surface 4, connected to one or more suction lines and delimited in part by a portion of the porous or multiperforated wall 8 corresponding to the majority portion 6 of the working surface 4 or to one or at least a particular limited area 6 'of said surface 4, respectively, said porous wall 8, the suction chambers 9 and 9 'and the suction line or lines together forming the main suction means 5' and secondary (s) 5 ".
    According to another characteristic of the invention, the working surface 4 of the first mold part 3 comprises structural units in relief over its entire extent, namely at its majority portion 6 and its zone or zones (s). ) specific small (s) 6 '.
    Thus, relief patterns 16 (for example graining) may be present, even on the wall portion (s) 2 "undergoing local deformation in the hollow, both at the bottom and at the lateral faces of these deformations 14.
    Preferably, and to facilitate the deformation at the edges of the zones 14 of the wall 2 "of the skin or part 2, it is provided that the or each particular limited area 6 of the working surface 4 of the first mold part 3 has a surface extension at least slightly greater than that of the zone or the corresponding hollow forming insert 7 present on the second mold part 3 ', in particular slightly projecting peripherally.
    To achieve a precise local deformation 14, with edges 14 "whose finish is controlled, the invention advantageously proposes that the or each hollow forming insert 7 is movable in translation, preferably in a direction substantially perpendicular to the surface working piece 4 'of the second mold part 3' or the plane which is locally tangent to said working surface 4 ', said part 7 being advantageously mounted interchangeably on said second mold part 3'.
    Thus, the or each piece 7 can be moved to come into contact with the wall 2 "before the local deformation of the latter is made, In addition, different types of parts 7 may be optionally provided.
    In accordance with a second embodiment of the invention, which may alternatively or cumulatively be considered in relation to the first variant mentioned above, it may be provided that a suction line 10 is associated with the or each zone. or hollow forming insert 7, said zone or part 7 advantageously having a porous or multi-perforated wall 7 'providing the working surface or recessed conformation.
    In accordance with a practical embodiment of this second variant, combined or not with the first variant previously described, the second mold part 3 'comprises at least one hollow forming piece 7 having a peripheral edge 7 ", which can be connected selectively to a source of suction or depression by a suction line 10 and movable between, on the one hand, a folded position, wherein said forming piece 7 is located at the most flush with the wall 2 "of the thermoformed piece 2, even recessed or at most flush with respect to the surface of the second portion of the mold 3 'and, secondly, an extended position, wherein said forming piece 7 comes, with its peripheral edge 7 ", close to or in application against the wall 2" of the thermoformed part 2 bearing against the first mold part 3 (edge distance 7 "- sheet 2" for example between 0 and 1 mm).
    Preferably, the peripheral edge 7 "of the forming part 7 has an inwardly curved conformation, possibly provided with a compression seal 7 '", able to define, during the contact or at the beginning of deformation, a chamber 11 substantially sealed with the wall 2 "of the thermoformed part 2. In addition, said hollow forming part 7 can be mounted movably, optionally with translation-guided in a housing 12 formed in the second mold part 3 ', said guide being preferably also ensured in the deployed position of said forming part 7.
    The edge 7 "thus has a profile (especially an inner edge profile) adapted to the desired shape for the edge 14" of the deformed zone 14, in particular at least slightly rounded or curved to prevent the rupture of the sheet 2 and thus the wall 2 "of the piece 2. Thus, the shape of the edge 7" (in fact the conformation of the inner side of this edge) determines the shape of the edge 14 "of the locally deformed zone 14 of the piece 2 .
    Advantageously, the hollow-shaped forming part 7, advantageously in the form of a shell, is mounted on at least one support axis 13, preferably in an easily interchangeable manner, which has a suction channel, or is traversed by a conduit. suction 10 connected to at least one through hole, to secondary channels or micro-perforations formed in the wall 7 'of said forming part 7 and opening on the inner working face or conformation of said piece of 7. In addition, the bidirectional displacement of this hollow forming part 7 can be achieved by means of a pneumatic or hydraulic cylinder, mounted and positioned on or in the second mold part 3 ', the sliding guide said piece 7 being made by the jack and / or by an additional particular guide structure.
    The embodiment shown by way of example in the appended figures shows only one hollow forming part 7. Nevertheless, as a variant, and although not shown, at least two parts 7, mounted in the same part of FIG. mold 3, 3 'or not and selectively and independently activatable, can be provided.
    Due to the possible removable mounting of the or each hollow forming piece 7, it is possible to achieve an even greater universality of the mold device 1, in particular a greater versatility in terms of manufacturing different versions of 2. The invention also relates to a method of manufacturing a thin-walled part 2 from a sheet 2 'of a thermoplastic material, by implementing the mold device 1 described above, said part 2 or not to include at least one localized area 14 having a particular configuration.
    This process consists, as shown in FIGS. 2 and 4 of the appended drawings, of setting up a sheet 2 ', possibly subjected to preheating, between first and second mold parts 3 and 3', to close said mold to form a mold. substantially sealed cavity 15 between the two mold parts 3 and 3 ', and optionally preform said sheet 2', and to conform said sheet 2 'by plastic deformation by its intimate application against the work surface or conformation 4 of a first part of the mold 3 under the effect of suction or suction so as to produce the part 2, to open the mold and to extract the resulting thermoformed part 2.
    According to the invention, said method furthermore consists, in a selective manner and as a function of the version of the part 2 to be obtained, to produce, if necessary, at least one local deformation of the sheet 2 ', after conformation of said sheet 2 'by application against the first mold part 3 and while the latter is in a state allowing its plastic deformation, said or each local deformation operation being performed by moving the portion of sheet 14' concerned in a zone or piece of hollow forming 7 present at the second mold part 3 ', after removal of the suction at the particular limited area (s) 6' of the working surface 4 of the first mold part 3, the displacement of the sheet portion or portions 14 'to be deformed being obtained by a blowing action at the particular limited zone (s) 6', by an action suction at level u of the hollow forming zone or piece 7 or by a combination of the two aforementioned actions, the sheet 2 'being held intimately against the majority portion 6 of the working surface 4 of the first mold part 3 during the production of the or local deformation (s) 14.
    More specifically, and in relation with a preferred variant of the invention, the step of producing a local deformation 14 of the sheet 2 'consists of performing the following operations: - relaxation of the suction at the level of the limited area particular 6 'of the working surface 4 of the first mold part 3; - Displacement of the hollow forming part 7 from its folded position to an extended position in which it comes close to or in support, possibly under controlled pressure, against the sheet 2 'forming the wall 2 "of the part 2 , with its peripheral edge 7 "; - Applying suction or making a depression in the forming part 7 and / or blowing from the particular limited area 6 'so as to locally deform the sheet 2' and to lay it tightly against the surface of the wall 7 of said forming piece; cutting of the suction at the level of the part 7 and / or suppression of the blowing at the level of the surface portion 6 '; - Moving the forming part 7 to its folded position.
    In accordance with a subvariant of the method according to the invention, apparent from FIGS. 6A to 6C, this may consist, after relaxation of the suction at the or each particular limited zone 6 ', in realizing all firstly a first local deformation by blowing to bring the sheet 2 'in contact with the edge 7 "of the part 7, then to perform a complementary deformation and the final forming of the skin area 14' concerned by suction against the face 7. By way of example, and particularly when the sheet 2 is made of a material of the polyethylene, polypropylene or polyvinyl chloride type, said sheet 2 is preheated to be at a temperature of about 180.degree. At 210 ° C. during the suction-forming phase, the optional subsequent phase of local deformation by blowing and / or suction and via the zone or the part 7 being carried out when the The material is still in a plastically deformable state, namely at a temperature of about 150 ° C to 170 ° C.
    In an optimized production management context, the method can consist in producing selectively, over a given production period, and according to a given manufacturing program resulting for example from a grouping of diversified customer orders in terms of a version of production. the desired part 1, parts 2 with or without one or more area (s) 14 local (s) particular deformation or configuration.
    In the aforementioned context, the method may further consist, between two cycles or production programs of parts 2 of different versions and to present one or more zones 14 of locally deformed configuration (s) and appearance (s) different, to interchange one or more hollow forming part (s) 7.
    In relation with FIGS. 2A to 2D, on the one hand, and FIGS. 4A to 4G, on the other hand, it will be understood that two flow scenarios of the production process of a part 2 can be implemented with the mold device 1 as shown in FIG. 1B, namely: introduction and preheating of the sheet 2 '(FIGS. 2A and 2B / FIGS. 4A and 4B: these figures are identical); - closing the mold and suction at the entire working surface 4, by implementation of the main suction means 5 'and the secondary suction means 5 "(Figures 2C and 4C, which are identical) - option 1: after cooling of the part 2, the suction is cut (at the means 5 'and 5 "), the mold is opened and the part is extracted (Figure 2D); - option 2: the recessed forming part 7 is deployed by translation and comes into contact with the wall 2 "of the part 2 pressed against the working surface 4, the suction is released at the zone 6 '(in being held at the level of the remainder of the surface 4) and a blowing action by this zone 6 'and / or a suction action at the part 7 starts (FIG) 4D); the wall portion 14' is deformed and takes the inner shape of the part 7 (Figure 4E), the local suction and / or blowing is cut (e) and the piece 7 is withdrawn in the second mold part 3 'by translation, by unmolding the deformed portion 14 '(Figure 4F), the suction is cut, the mold is opened and the piece 2 is extracted after cooling (Figure 4G).
    The means 1 'for heating the sheet 2' can either be fixed and arranged next to the mold (heating the sheet 2 'before it is placed between the two parts of the mold 3 and 3' apart) or be movable ( heating the sheet 2 'in the mold before closing, as shown in Figures 2B and 4B).
    Finally, as shown in FIGS. 3 and 5, the invention also relates to an interior trim or lining element that is formed by a thermoformed piece 2 with a thin wall 2 "or that comprises an exposed face provided by such a piece 2 This piece 2 optionally comprises at least one localized zone 14 having a local deformation of its wall 2 "or a particular local configuration, in particular hollow deformation, and preferentially has a surface or a pattern or repetitive relief 16.
    In accordance with the invention, the thermoformed part 2 is obtained by means of the manufacturing method described above and comprises at least one hollow deformation 14, forming for example a housing for the reception of an accessory, as well as possibly a pattern in repetitive relief, present on the entire surface of said piece 2.
    Of course, the invention is not limited to the embodiments described and shown in the accompanying drawings. Modifications are possible, particularly from the point of view of the constitution of the various elements or by substitution of technical equivalents, without departing from the scope of protection of the invention.
    权利要求:
    Claims (16)
    [1" id="c-fr-0001]
    1) Thermoforming mold device for producing a thin-walled part from a sheet of thermoplastic material, said mold device (1) comprising two mold parts (3 and 3 ') with surfaces working piece (4, 4 ') of substantially complementary shapes and of which at least one of the parts is movable so as to define a state of opening and a state of closure of the mold, a first (3) of the two mold parts (3, 3 ') comprising suction means (5) for pressing the sheet (2') against its working surface (4), the suction means (5) comprising, on the one hand, a means for main suction (5 ') adapted and intended to generate a negative pressure or suction on a majority portion (6) of the working surface (4) of said first mold part (3) and, on the other hand, at least a secondary suction means (5 ") adapted and intended to generate a negative pressure or suction at the level of at least a particular limited area (6 ') of said working surface (4), this at least partially independently of the main suction means (5'), mold device (1) characterized in that the second part of mold (3 ') comprises at least one integrated zone or a hollow forming insert (7), said zone or part (7) being arranged so as to be located, when the mold is closed, directly opposite the or respectively of each particular limited area (6 ') of the working surface (4) of the first mold part (3), the or each secondary suction means (5 ") being controllable, at least for its shutdown or with a view to suspending the suction, independently of the main suction means (5 ').
    [0002]
    2) Mold device according to claim 1, characterized in that the or each secondary suction means (5 ") and adapted and intended to generate a positive pressure or a blowing action at the or each particular limited area (6 ') of the working surface of the first mold part (3).
    [0003]
    3) mold device according to any one of claims 1 and 2, characterized in that the first mold part (3) comprises a multiperforated or porous wall (8) permeable to gases, providing the working surface (4) of said portion (3), a main suction chamber (9) and at least one secondary suction chamber (9 '), said chambers (9 and 9') being located on the side of the wall (8) opposite the working surface (4), connected to one or more suction lines and delimited in part by a portion of the porous or multi-perforated wall (8) corresponding to the majority portion (6) of the working surface (4) or to one or at least one particular limited area (6 ') of said surface (4), respectively, said porous wall (8), the suction chambers (9 and 9') and the suction line (s) forming together the main suction means (5 ') and secondary (s) (5 ").
    [0004]
    4) Mold device according to any one of claims 1 to 3, characterized in that the working surface (4) of the first mold part (3) comprises structural patterns in relief over its entire extent, namely at level of its majority (6) and its particular restricted area (s) (6 ').
    [0005]
    5) mold device according to any one of claims 1 to 4, characterized in that the or each particular limited area (6) of the working surface (4) of the first mold part (3) has a surface extension at least slightly greater than that of the zone or the corresponding hollow forming piece (7) present on the second mold part (3 '), in particular slightly projecting peripherally.
    [0006]
    6) Mold device according to any one of claims 1 to 5, characterized in that the or each hollow forming insert (7) is movable in translation, preferably in a direction substantially perpendicular to the working surface (4). ') of the second mold part (3') or the plane which is locally tangent to said working surface (4 '), said part (7) being advantageously mounted interchangeably on said second mold part (3') .
    [0007]
    7) A mold device according to any one of claims 1 to 5, characterized in that a suction line (10) is associated with the or each hollow forming zone or insert (7), said zone or part (7) advantageously having a porous or multi-perforated wall (7 ') providing the working surface or recessed conformation.
    [0008]
    8) mold device according to any one of claims 6 and 7, characterized in that the second mold part (3 ') comprises at least one hollow forming piece (7) having a peripheral edge (7 "), being selectively connectable to a suction or vacuum source by a suction line (10) and displaceable between, on the one hand, a folded position, wherein said forming piece (7) is located at most flush with the wall (2 ") of the thermoformed piece (2), or even recessed or at most flush with respect to the surface of the second portion of the mold (3 ') and, secondly, a deployed position, wherein said forming piece (7) comes, with its peripheral edge (7 "), near or in application against the wall (2") of the thermoformed piece (2) bearing against the first part of mold (3).
    [0009]
    9) A mold device according to any one of claims 6 to 8, characterized in that the peripheral edge (7 ") of the forming piece (7) has an inwardly curved shape, possibly provided with a seal compression device (7 '"), able to define, during the contact or at the beginning of deformation, a chamber (11) substantially sealed with the wall (2") of the thermoformed part (2) and in that said forming part recessed (7) is mounted movably, optionally with translational guidance in a housing (12) formed in the second mold part (3 '), said guide being preferably also provided in the extended position of said forming part (7).
    [0010]
    10) A mold device according to any one of claims 6 to 9, characterized in that the hollow forming piece (7), advantageously shell-shaped, is mounted on at least one support axis (13), preferably of easily interchangeable manner, which has a suction channel or is traversed by a suction duct (10) connected to at least one through orifice, secondary channels or micro-perforations arranged in the wall (T ) of said forming piece (7) and opening on the inner face of work or conformation of said forming piece (7) and in that the bidirectional displacement of this hollow forming piece (7) is carried out by the intermediate of a pneumatic or hydraulic cylinder, mounted and positioned on or in the second mold part (3 '), the sliding guide of said part (7) being provided by the jack and / or by an additional particular guide structure .
    [0011]
    11) A method of manufacturing a thin-walled part from a sheet of thermoplastic material, by implementing the mold device (1) according to any one of claims 1 to 10, said part (2) whether or not to include at least one localized area having a particular configuration (14), said method comprising placing a sheet (2 '), optionally preheated, between first and second mold parts (3 and 3') ), closing said mold to form a substantially sealed cavity (15) between the two mold parts (3 and 3 '), and optionally preforming said sheet (2'), and conforming said sheet (2 ') by plastic deformation by its intimate application against the work surface or conformation (4) of a first mold part (3) under the effect of suction or suction so as to make the workpiece (2), to open the mold and extracting the thermoformed part (2) resulted characterized in that it furthermore consists, selectively and as a function of the version of the part (2) to be obtained, to produce, if necessary, at least one local deformation of the sheet (2 '), after conforming said sheet (2 ') by application against the first mold part (3) and while the latter is in a state allowing its plastic deformation, said or each local deformation operation being carried out by displacement of the sheet portion ( 14 ') in a hollow forming zone or piece (7) present at the second mold part (3'), after removal of the suction at the limited zone (s). particular (s) (6 ') of the working surface (4) of the first mold part (3), the displacement of the sheet portion or portions (14') to be deformed being obtained by a blowing action at the of the particular restricted area (s) (6 ') by an action of spiration at the zone or hollow forming part (7) or by a combination of the two aforementioned actions, the sheet (2 ') being held intimately against the majority portion (6) of the working surface (4) of the first mold part (3) during the production of the local deformation (s) (14)
    [0012]
    12) The manufacturing method according to claim 11, characterized in that the step of performing a local deformation of the sheet consists in performing the following operations: - release of the suction at the particular limited area (6 ' ) of the working surface (4) of the first mold part (3); - Displacement of the hollow forming piece (7) from its folded position to an extended position in which it comes close to or in support, optionally under controlled pressure, against the sheet (2 ') forming the wall (2 ") of the workpiece (2), with its peripheral edge (7"); - application of suction or vacuum in the forming part (7) and / or blowing from the particular limited area (6 ') so as to locally deform the sheet (2') and to plaque intimately against the surface of the wall (T) of said forming piece; - cutting the suction at the piece (7) and / or removing the blow at the surface portion (6 '); - Moving the forming piece (7) to its folded position.
    [0013]
    13) The manufacturing method according to any one of claims 11 and 12, characterized in that it consists, after relaxation of the suction at the or each particular limited area (6 '), to achieve any first a first local deformation by blowing to bring the sheet (2 ') in contact with the edge (7 ") of the piece (7), then to perform a complementary deformation and the final forming of the zone (14) of skin (2 ') concerned by suction against the inner face of said piece (7).
    [0014]
    14) A manufacturing method according to any one of claims 11 to 13, characterized in that it consists in producing selectively, over a given production period, and as a function of a given manufacturing program resulting for example from a grouping of diversified customer orders in terms of the version of the part (2) desired, parts (2) with or without one or more local area (s) (14) with particular deformation or configuration.
    [0015]
    15) A manufacturing method according to any one of claims 11 to 14, characterized in that it consists, between two cycles or production programs of parts (2) of different versions and to present one or more zones (s) ( 14) locally deformed (s) of configuration (s) and appearance (s) different, to interchange one or more forming part (s) recessed (7).
    [0016]
    16) Element of lining or internal lining formed by a thin-walled thermoformed piece or comprising an exposed face provided by such a piece, said piece (2) comprising at least one localized zone (14) having a local deformation of its wall (2 ") or a particular local configuration, in particular a hollow deformation, and preferentially having a surface or repetitive pattern, characterized in that the thermoformed part (2) is obtained by means of the method of manufacture according to any one of claims 11 to 15 and comprises at least one zone with a deformation hollow (14), forming for example a housing for receiving an accessory, and possibly a repeating relief pattern, present on the entire surface of said piece (2), said deformed deformation (14) consisting of a local plastic deformation of the sheet (2 ') forming the piece (2) obtained by as drawing of the respective sheet portion (14 ') into a hollow forming piece (7).
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    同族专利:
    公开号 | 公开日
    ES2797103T3|2020-12-01|
    CN106863764A|2017-06-20|
    US20170165897A1|2017-06-15|
    JP6802700B2|2020-12-16|
    EP3178631A1|2017-06-14|
    CN106863764B|2021-05-25|
    JP2017105195A|2017-06-15|
    US10343329B2|2019-07-09|
    FR3044953B1|2018-05-18|
    EP3178631B1|2020-03-18|
    引用文献:
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    WO1994025248A1|1993-04-26|1994-11-10|Atoma International, Inc.|Method of molding a vehicle door panel with a soft arm rest|
    EP1854616A2|2006-05-12|2007-11-14|Edwin J. Oakey|A vacuum mold apparatus and a deep drawing method of forming a polymeric sheet material|
    JP2008037056A|2006-08-10|2008-02-21|Calsonic Kansei Corp|Method and apparatus for manufacturing vehicular interior trim part|
    EP0295500B2|1987-06-03|2003-09-10|Nippon Steel Corporation|Hot rolled steel sheet with a high strength and a distinguished formability|
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    US10390912B1|2015-05-04|2019-08-27|Loren S. Adell|Thermoforming aids and methods|
    EP3651226B1|2018-11-09|2021-09-29|Lg Chem, Ltd.|Pouch forming method and pouch forming device|
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    法律状态:
    2016-12-22| PLFP| Fee payment|Year of fee payment: 2 |
    2017-06-16| PLSC| Search report ready|Effective date: 20170616 |
    2017-12-21| PLFP| Fee payment|Year of fee payment: 3 |
    2019-12-19| PLFP| Fee payment|Year of fee payment: 5 |
    2020-12-23| PLFP| Fee payment|Year of fee payment: 6 |
    2021-08-13| CD| Change of name or company name|Owner name: SMRC AUTOMOTIVE HOLDINGS NETHERLANDS B.V., NL Effective date: 20210705 |
    2021-08-13| CA| Change of address|Effective date: 20210705 |
    优先权:
    申请号 | 申请日 | 专利标题
    FR1562151A|FR3044953B1|2015-12-10|2015-12-10|ASPIRATION THERMOFORMING MOLD DEVICE AND METHOD FOR MANUFACTURING THE SAME|
    FR1562151|2015-12-10|FR1562151A| FR3044953B1|2015-12-10|2015-12-10|ASPIRATION THERMOFORMING MOLD DEVICE AND METHOD FOR MANUFACTURING THE SAME|
    US15/370,812| US10343329B2|2015-12-10|2016-12-06|Vacuum thermoforming mold device and a manufacturing method employing same|
    ES16306639T| ES2797103T3|2015-12-10|2016-12-08|Aspiration thermoforming mold device, manufacturing process that uses it and manufactured item|
    EP16306639.2A| EP3178631B1|2015-12-10|2016-12-08|Suction thermoforming mould device, manufacturing method implementing same and manufactured element|
    CN201611127662.0A| CN106863764B|2015-12-10|2016-12-09|Thermoforming mold device by suction and manufacturing method using the same|
    JP2016240086A| JP6802700B2|2015-12-10|2016-12-12|A molding device for performing thermoforming and a manufacturing method using this molding device|
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