Selective cutting one shot

Abstract

The invention relates to a process and a device for forming a planiform piece intended, in particular, for the interior fittings of motor vehicles, in which a layer of support material (1) is covered, at least on one of its faces (2) and in the area of a portion (3), at least, of its contour, or so-called portion to be bordered, with a cladding sheet (4) and said support (1) is cut along said portion to be bordered (3) in such a way that said cladding (4) projects from said support (1) in the area of said portion. According to the invention, a cutting tool (5) is pre-positioned between said cladding (4) and said support (1) along said portion to bordered (3) said cutting is effected with said cutting tool (5), when the support (1) is covered by the cladding (4).

Description

TECHNICAL FIELD

[0001] The invention relates to a process and a device for forming a planiform piece intended, in particular, for the interior fittings of motor vehicles.

BACKGROUND

[0002] The expression “planiform piece” is to be taken as meaning a piece the thickness of which is very considerably smaller than the other dimensions, said piece not necessarily being flat, but possibly having inwardly and/or outwardly facing deformations.

[0003] Although more especially intended for forming pieces designed for the interior trim of the bodywork of motor vehicle passenger compartments such as, for example, door panels, cabinet-work or dashboards, the invention can also be used to form pieces intended for any other field.

[0004] There are presently known pieces constituted by a support layer of fibrous material lined, on one of their faces, with a cladding sheet which borders the support along its contour.

[0005] To obtain such pieces, the support of the cladding sheet is formed, and then the support is cut out along its contour and the support is covered in such a way that the cladding projects beyond said support so it can then be tucked round.

[0006] It will be noted that such a process necessitates two manufacturing stages, one to produce the support and the other to attach the cladding sheet, which has an effect on the cost price.

SUMMARY OF INVENTION

[0007] The aim of the present invention is to provided a process and a device for forming a planiform piece, intended, in particular, for the interior fittings of motor vehicles, that remedy the aforementioned drawbacks and enable additional operations to be avoided.

[0008] Another object of the present invention is to provided a process for forming a planiform piece, intended, in particular, for the interior fittings of motor vehicles, that makes it possible to succeed in cutting the support while minimising the risks of flash or tearing.

[0009] A further aim of the present invention is to provide a process for forming a planiform piece intended, in particular, for the interior trim of motor vehicles that enables the cladding of the piece formed to be preserved.

[0010] Further aims and advantages of the invention will emerge in the course of the following description, which is given only by way of illustration and is not intended to limit same.

[0011] The invention relates firstly to a process for forming a planiform piece intended, in particular, for the interior fittings of motor vehicles, in which a layer of support material is covered, at least on one of its faces and in the area of a portion, at least, of its contour, or so-called portion to be bordered, with a cladding sheet and said support is cut along said portion to be bordered in such a way that said cladding projects from said support in the area of said portion, characterised by the fact that a cutting tool is pre-positioned between said cladding and said support along said portion to be bordered and said cutting is effected with said cutting tool, when the support is covered by the cladding.

[0012] The invention also relates to a device for forming a planiform piece intended, in particular, for the interior fittings of motor vehicles, including:

[0013] means for covering a layer of support material, on at least one of its faces and in the area of a portion, at least, of its contour, or so-called ‘portion to be bordered’, with a cladding sheet, through the change over of said means for covering the support from a first configuration to a second configuration,

[0014] means for cutting said support along said portion to be bordered in such a way that said cladding projects beyond said support in the area of said portion, said cutting means being constituted by a cutting tool, suitable for being positioned between said cladding and said support, along said portion to be bordered, and for permitting cutting when the means for covering the support change from their said first to their said second configuration.

BRIEF DESCRIPTION OF DRAWINGS

[0015] The invention will be more readily understood from a study of the following description, accompanied by the annexed drawings, which form an integral part thereof, and wherein:

[0016] FIGS. 1 a to 1c illustrate, in cross-section, the different steps in a first exemplary embodiment of the process according to the invention,

[0017] FIGS. 2 a to 2c illustrate, in cross-section, the different steps in a second exemplary embodiment of the process according to the invention,

[0018] FIGS. 3 a and 3c illustrate, in cross-section, the different steps in a third exemplary embodiment of the process according to the invention,

[0019] FIGS. 4 a to 4c, illustrate, in cross-section, a fourth exemplary embodiment of the process according to the invention,

[0020] FIG. 5 is an enlarged view of a portion, bearing the number 5 in the preceding figures, of an example of a piece obtained through the process according to the invention.

DETAILED DESCRIPTION OF INVENTION

[0021] The invention relates firstly to a process for forming a planiform piece.

[0022] As illustrated in FIGS. 1 to 4, according to the process of the invention, a layer of material, in particular fibrous material, defining a support 1 is covered by a cladding sheet 4 on at least one of its faces 2 and in the area of a portion 3, at least, of its contour, or so-called ‘portion to be bordered’.

[0023] Said support is intended, for example, to impart its form to the piece thus obtained, while cladding 4 serves, in particular, to enhance its appearance. The latter is constituted, for example, by a multi-layer material including, in particular, a thickness of non-woven fabric, a thickness of foam and a thickness of textile. Said cladding 4 is provided, for example, over the entire surface of said face 2 and/or over all of its contour.

[0024] Said support 1 is cut along said portion to be bordered 3 in such a way that said cladding 4 projects beyond said support 1 in the area of said portion 3.

[0025] For this purpose, a cutting tool 5 is pre-positioned between said cladding 4 and said support 1 along said portion to be bordered 3 and said cutting is carried out with said cutting tool 5 when support 1 is covered by cladding 4.

[0026] It will be noted that, according to the invention, selective cutting is thus performed making it possible to avoid damaging the cladding and not to have to perform an additional operation on the piece in order to cut the support.

[0027] As illustrated in FIG. 5, there is obtained a piece 6 constituted by said support 1 and said cladding 4. The latter projects beyond said support 1 along said portion to be bordered 3 of its contour, in the area of a portion, bearing the number 7, which is thus available to be tucked round on the opposite face 8 of said support 1. The cut off portion, numbered 9, of the latter is discharged elsewhere.

[0028] This operation is conducted, for example in a mould 10 comprising a punch 11 and a die 12, defining between them an air gap 13. The latter has, for instance, the dimensions and/or the profile of the piece to be formed.

[0029] Said punch 11 and said die 12 are movable towards one another to enable the mould to be closed in a so-called ‘forming’ direction 14.

[0030] In said mould 10 said support 1 and said cladding 4, are positioned, for example, between said die 12 and said punch 11. Said support 1 and said cladding 4, placed facing one another in said forming direction, are each constituted by a first zone 15a, located in air gap 13, and by a second zone 15b, extending beyond said air gap 13.

[0031] Said second zone 15b of said support 1 is designed to constitute, for example, said cut off portion 9. It is provided, in particular, all along said portion to be bordered 3. The second zone 15b of said cladding 4 is intended to constitute, for example, projecting portion 7.

[0032] In said mould 10, said cutting tool 5 is also positioned, in the vicinity of the limit between said first zone 15a and said second zone 15b of said support 1 and/or of said cladding 4. Said cutting tool 5 is thus set in place as close as possible to said support 1 and/or said cladding 4.

[0033] Said support 1 and said cladding 4 are adhered to one another by closing said mould, in said forming direction 14, said support 1 and said cladding 4 being possibly formed simultaneously, according to the profile given to air gap 13. For this purpose, thermocompression is used.

[0034] Cutting and closing of the mould can advantageously by coordinated by controlling the path of cutting tool 5 in relation to the relative path of die 12 and of punch 11 in such a way as to complete these two operations simultaneously. In other words, said cutting will be carried out at the end of the closing movement of mould 10 in said direction 14.

[0035] When the mould is closed said support 1 or said cladding 4 is held in position, for example, by means of said cutting tool 5 against punch 11 or die 21, in the area of their said second zone 15b, so as to control their movement in the planes orthogonal to said forming direction 14.

[0036] More precisely, as illustrated in FIGS. 1 to 3, said support 1 can be held in position against punch 11 by applying a cutting portion 16 of said cutting tool with controlled pressure against said punch 11, to obtain a sliding contact of said support between the latter. For cutting purposes, a pressure increment is then applied to said cutting portion 16 of said cutting tool 5. The positioning clearances of said support 1 are thus reduced.

[0037] To obtain said pressure increment, said punch 11 and/or said die 12 is/are moved towards one another, when the mould is closed, and the amount of movement of said punch 11 and/or of said die 12 originating from the closing of the mould is applied, for example, directly or indirectly to said cutting tool 5. It is thus unnecessary to have any other source of energy to activate the cutting tool.

[0038] It should be noted that the use of the amount of movement of punch 11 and/or of die 12 could also be contemplated without cutting tool 5 having previously been placed in contact with support 1.

[0039] As illustrated in FIG. 4, according to another form of embodiment, said cladding 4 is held in position against said die 12 by pinching between a non-cutting portion 17 of said cutting tool 5 and said die 12. A frame 40 can also be used. The energy for cutting is then imparted by a jack 18, acting, directly or indirectly, on said cutting tool 5 and secured to said die 12, after the closing of mould 10.

[0040] As illustrated in FIGS. 2 and 3, said support 1 may possibly be wedged, in the area of the limit between said first zone 15a and said second zone 15b, against said punch 11, prior to cutting. According to other forms of embodiment, forming against die 12 can also be carried out.

[0041] By way of a non-limitative example, according to the different forms of embodiment illustrated, support 1 or cladding 4 is placed in air gap 13, said cutting tool 5 is then placed in contact with said support 1 or said cladding 4, and then cladding 4 or support 1, respectively, is inserted between cutting tool 5 and the other portion of the mould. The latter is then closed, which drives said cutting tool 5, at the very least according to the exemplary embodiments of FIGS. 1 to 3.

[0042] The invention also relates to a device for forming a planiform piece, in particular for implementing the process described above.

[0043] It includes means 19 for covering a layer of support material 1, on at least one of its faces 2 and in the area of a portion, at least, of its contour, or so-called portion to be bordered 3, with a cladding sheet 4, through the changeover of said means 19 from a first configuration, the open position of mould 10, illustrated in FIGS. 1a, 1b, 2a, 2b, 3a, 3b and 4a, 4b, to a second configuration, the closed position of mould 10, illustrated in FIGS. 1c, 2c, 3c and 4c.

[0044] Said device also includes means 20 for cutting said support 1 along said portion to be bordered 3, in such a way that said cladding 4 projects beyond said support 1.

[0045] Said cutting means 20 are constituted by a cutting tool 5 capable of being positioned between said cladding 4 and said support 1, along said portion to be bordered 3, and of permitting cutting, when covering means 19 change over from their said first to their said second configuration.

[0046] Said means 19 for covering support 1 are constituted, for example, by a mould 10 comprising a punch 11 and a die 12 defining between them an air gap 13. Said punch 11 and said die 12 are movable towards one another to enabling the mould 10 to close in a direction 14, or so-called forming direction.

[0047] Said support 1 and said cladding 4 can thus be adhered to one another by closing said mould 10 in said forming direction 14.

[0048] Mould 10 further comprises, in particular, means 21 for positioning said support 1 and/or means 22 for positioning said cladding 4, capable of permitting their placing in such a way that said support and said cladding are placed facing one another in said forming direction and are each constituted by a first zone 15a located in air gap 13 and by a second zone 15b extending beyond said air gap 13.

[0049] Said mould 10 further comprises means 23 for positioning said cutting tool 5, capable of permitting its placing in the vicinity of the limit between said first zone 15a and said second zone 15b of said support 1 and/or said cladding 4.

[0050] As described more fully below, means 37 co-operate to permit the simultaneous completion of the cutting of support 1 by the cutting means and the closing of the mould.

[0051] Said means 21 for positioning support 1 or said means 22 for positioning cladding 4 are constituted, in particular, by said cutting tool 5. The latter can, in fact, possibly be capable of holding said support 1 or said cladding 4 in position, when the mould closes, against punch 11 or die 12, in the area of their said second zone 15b, so as to control their movement in planes orthogonal to forming direction 14.

[0052] Said means 23 for positioning cutting tool 5 are constituted, for example, by a means 24 supporting said cutting tool and an intermediate member 25, in relation to which said cutting tool 5 is articulated, with said intermediate member 25 co-operating directly or otherwise with punch 11 or die 12.

[0053] As illustrated in FIGS. 1, 2 and 4, said means 24 supporting the cutting tool is articulated, for example, in rotation in relation to said intermediate member 25 about an axis 26. According to another form of embodiment, as illustrated in FIGS. 3, this can also involve deflection in translation in directions 27, 28 substantially parallel and/or orthogonal to said forming direction 14.

[0054] As illustrated in FIGS. 1 and 2, said means 21 for positioning support 1 are constituted, for example, by said cutting tool 5, capable of coming to bear against said punch 11 and said means 23 for positioning cutting tool 5 further include a jack, or ram, 29, acting on said means 24 supporting the cutting tool, so as to permit sliding contact of said support 1 between a cutting portion 16 of said cutting tool 5 and said punch 11. Said jack 29 of means 23 for positioning the cutting tool is secured, in particular, to said intermediate member 25.

[0055] Said mould 10 comprises means 30 for applying a pressure necessary for said cutting portion 16 of said cutting tool 5, for cutting purposes.

[0056] Advantageously, as illustrated in FIGS. 1, punch 11, intermediate member 25 and support 24 for cutting tool 5 are in direct contact with one another. Such a configuration facilitates heat exchange between them. Consequently, the expansion phenomena are distributed among each of them, which makes it possible to reduce uncertainty as to positioning.

[0057] This being the case, as illustrated in FIGS. 1 to 3, the device according to the invention can include, for cutting purposes, pressing means 31 to apply to said support 24 for cutting tool 5 and/or to said cutting tool 5 itself, the amount of movement of said punch 11 originating from the closing of mould 10. According to other forms of embodiment, not illustrated, this can involve, alternatively or cumulatively, the amount of movement of die 12.

[0058] As illustrated in FIGS. 1 and 2, said pressing means 31 are constituted, for example, by stops 32, secured to said die 12 and extending towards punch 11, outside air gap 13, so as to be able to come to bear against support 24 for cutting tool 5 and/or cutting tool 5 itself, when the mould closes.

[0059] As illustrated in FIG. 3, said pressing means 31 can be constituted, for instance, by a wedge, or corner piece, 33 co-operating with an inclined plane 34 provided parallel on said support 24 of cutting tool 5, said wedge 33 being secured to said die 12 and said plane 34 being slightly inclined in relation to said forming direction 14.

[0060] It will be noted that, according to the different forms of embodiment mentioned earlier, said means 30 for applying the pressure necessary for cutting and said pressing means 31 are possibly one and the same and act when said cutting tool 5 bears against said support 1, itself bearing on punch 11.

[0061] In FIGS. 3, said wedge 33 even serves to position support 1 against punch 1 when the mould closes. More precisely, the movements of the cutting tool in direction 28 orthogonal to forming direction 14 are obtained by said wedge 33; through co-operation with said inclined plane 34, while their movements in direction 27 parallel to said forming direction 14 can be obtained using independent means.

[0062] According to other forms of embodiment, not illustrated, said pressing means 31 can be used without cutting tool 5 serving to position said support 1 against said punch 11.

[0063] As illustrated in FIGS. 4, said means 22 for positioning cladding 4 are constituted, for example, by said cutting tool 5, which is intercalated between said cladding 4 and said support 1 and, being provided with a non-cutting zone 17, is capable of pinching said cladding 4 against said die 12. Said mould 10 is then provided with a jack 18, secured, in particular, to said die 12, to apply the force required for cutting to support 24 of said cutting tool 5 and, subsequently, to said cutting tool 5 itself.

[0064] Again in the same figures, as well as in FIG. 1, it will be noted that wedges 37, secured to support 24 of cutting tool 5 and/or to stop 32, can co-operate to complete the closing of the mould and the cutting operation simultaneously.

[0065] Means 38 are constituted, in particular, by elastic return means, located between a fixed point on the mould and support 24 of said cutting tool and/or said intermediate member 25, so as to restore it to the initial position.

[0066] According to the form of embodiment illustrated in FIGS. 2, said elastic return means are located between said intermediate member 25 and a base 39 of mould 10. The elements of the assembly formed by support 24 of said cutting tool 5, said intermediate member 25 and said jack 29 acting on said support 24 for said cutting tool 5 are then movable in relation to said base 30.

[0067] In the case of a mould 10 intended to form a part having a portion 3 to be bordered on several of its sides, a said cutting tool 5, as well as said means 21, 22, 23 for positioning said support 1, said cladding 4 and said cutting tool 5 are used in the area of each of the sides of the mould intended to receive said portion to be bordered 3. Several jacks 18, 29 can be provided along each of said sides to actuate said cutting tools 5 and/or their supports 24.

[0068] Other forms of embodiment, with the grasp of a person skilled in the art, could, of course, have been contemplated without thereby departing from the scope of the invention.

Claims

1. A process for forming a planiform piece intended for an interior fitting of a motor vehicle, the process comprising: covering at least one layer of at least one face (2) along a portion (3) of a support material (1) with a cladding (4); cutting along said portion (3) such that said cladding (4) projects from said support material (1) in said portion (3); pre-positioning a cutting tool (5) between said cladding (4) and said support material (1) along said portion (3); and cutting along said portion (3) with said cutting tool (5) when said support material (1) is covered with said cladding (4).

2. The process according to claim 1 wherein a mould (10) comprising a punch (11) and a die (12) which define an air gap (13), and wherein the punch (11) and the die (12) are movable towards one another to enable the mould to be closed in a forming direction (14), and wherein said support (1) and said cladding (4) are positioned between said die (12) and said punch (11), said support (1) and said cladding (4), placed facing one another in said forming direction (14), each being constituted by a first zone (15a), located in air gap (13), and by a second zone (15b), extending beyond said air gap (13), and wherein said cutting tool (5) is positioned in a vicinity of a limit between said first zone (15a) and at least one of said second zone (15b) of said support (1) and of said cladding (4).

3. The process according to claim 2, wherein said support material (1) and said cladding (4) are adhered to one another by closing said mould (10) in said forming direction (14), and wherein said support material (1) and said cladding (4) are held in position using said cutting tool against at least one of the punch (11) and the die (12), in an area of their said second zone (15b) so as to control their movement in planes orthogonal to said forming direction (14), when the mould closes.

4. The process according to claim 3, wherein said support (1) is held in position against the punch (11) during the closing of the mould by applying a cutting portion (16) of said cutting tool (5) with a controlled pressure against said punch (11), to obtain a sliding contact of said support (1) with said punch (11), and wherein a pressure increment is applied to said cutting portion (16) of said cutting tool (5).

5. The process according to claim 2, wherein at least one of said punch (11) and said die (12) are moved towards one another when the mould closes and the amount of movement of said punch (11) and of said die (12) originating from the closing of the mould is applied directly or indirectly to said cutting tool (5).

6. The process according to claim 2, in which the cutting and the closing of the mould are co-ordinated by controlling the path of the cutting tool in relation to the relative path of the die (12) and of the punch (11) in order to perform these two operations simultaneously.

7. The process according to claim 2, in which said support (1) is wedged in an area of a limit between said first zone (15a) and said second zone (15b), against at least one of said die (12) and said punch (11), prior to cutting.

8. A device for forming a planiform piece for an interior fitting of a motor vehicle, the device comprising: a covering means (19) for covering a layer of support material (1), on at least one face (2) and in a portion (3) of said support material (1) with a cladding (4), wherein said covering means (19) changes from a first configuration to a second configuration; a cutting means (20) for cutting said support material (1) along said portion (3) such that said cladding (4) projects beyond said support material (1) in said portion (3), and wherein said cutting means (20) is adaptable for being positioned between said cladding (4) and said support material (1), along said portion (3), and cutting said support material (1) along said portion (3) when the covering means (19) changes from said first to said second configuration.

9. The device according to claim 8, wherein said covering means (19) for covering said support (1) include a mould (10) having a punch (11) and a die (12), wherein an air gap (13) is defined between said punch (11) and said die (12) such that said punch (11) and said die (12) are movable towards one another to permit the closing of the mould in a forming direction (14).

10. The device according to claim 9, wherein said mould (10) further comprises: a first positioning means (21) for positioning said support (1); a second positioning means (22) for positioning said cladding (4), wherein said first and second positioning means position said support (1) and said cladding (4) facing one another in said forming direction (14) and wherein said support material (1) and said cladding (4) have a first zone (15a) located in said air gap (13) and a second zone (15b) projecting from said air gap (13); and a third positioning means (23) for positioning a cutting tool (5) between said first zone (15a) and said second zone (15b) of said support material (1) and said cladding (4).

11. The device according to claim 10, wherein said first positioning means (21) and said second positioning means (22) is a cutting tool (5) configured to hold said support material (1) and cladding (4) in position against said punch (11) and said die (12), in said second zone (15b), so as to control movement in a plane orthogonal to said forming direction (14), when said mould closes.

12. The device according to claim 10, wherein said third positioning means (23) for positioning cutting tool (5) includes a support (24) articulated in relation to an intermediate member (25) for co-operating with at least one of the punch (11) and the die (12).

13. The device according to claim 12, wherein: said first positioning means (21) for positioning the support material (1) is a cutting tool (5) and is capable of coming to bear against said punch (11), and wherein said third positioning means (23) further includes a jack (29), acting on a cutting tool support (24) for applying a controlled pressure to a cutting portion (16) of said cutting tool (5) against said punch (11), to obtain a sliding contact of said support material (1); and said mould (10) further include an applying means (30) for applying a pressure increment to said cutting portion (16) of said cutting tool (5).

14. The device according to claim 12, further comprising a pressing means (31) for applying to said support (24) of the cutting tool (5) and to said cutting tool (5) an amount of movement of said punch (11) and of said die (12) originating from the closing of the mould.

15. The device according to claim 14, wherein said pressing means (31) has a plurality of stops (32) secured to said die (12) and extending towards the punch (11), outside the air gap (13), so as to be able come to bear against at least one of the support (24) of said cutting tool (5) and the cutting tool (5) itself, when the mould closes.

16. The device according to claim 14, further comprising wedges (37) secured to at least one of the support (24) of the cutting tool (5) and at least one of the plurality of stops (32), so as to control the path of the cutting tool to complete the closing of the mould and the cutting operation simultaneously.

17. The device according to claim 14, further comprising an elastic return means located between a fixed point on the mould (10) and at least one of the support (24) of said cutting tool (5) and said intermediate member (25), so as to restore the elastic return means to an initial position.