FR2806334A1 - BRAKING PRESS FOR HOT OR COLD ROLLED SHEETS AND A BRAKING ASSEMBLY FOR SUCH A PRESS - Google Patents

Abstract

The press comprises upper and lower stages (142, 144) the lower stage inversely cradling an inflatable membrane (154). A thin rebated plate (168) covers the membrane and supports layers of linen (164) and a gripping material (166) which cooperates with a lower felt sheet (152). On inflation of the membrane the metal laminations (20',20'') are gripped by the lower felt sheet and a second felt sheet (146) similarly attached to the top stage An Independent claim is made for a braking assembly which may be used to convert an existing press.

Description

The present invention relates to a brake press for laminated sheets

  hot or cold and a brake assembly for a

such press.

  More specifically, the present invention relates to a braking press intended to regulate the speed of advance of sheets previously laminated and cut to the desired width before they are wound on a storage cylinder for subsequent processing. Such a braking press is necessary because, at the outlet of the rolling mill, the initial sheet has significant variations in thickness on

  throughout its width and over its entire length.

  Such braking presses have already been proposed.

  Referring to FIG. 1 which schematically represents an assembly 10 for the longitudinal cutting of laminated sheets, this comprises, from upstream to downstream, an unwinding system 12, a cutting system 14, a brake press 16 and a

winding system 18.

  Thus, a sheet 20 of large width wound on a cylinder 22 is first unwound, at the location of the unwinding system 12, the cylinder 22 being rotated while the sheet 20 advances on

drive rollers 24.

  Then, this sheet 20 passes through the cutting system 14 which is provided with longitudinal cutting means 26 such as a disc cutter (circular knives), with blades or a shears so that at the outlet, the sheet 20 is composed of 20 'and 20 "sheets

  forming two ribbons narrower than the sheet 20.

  The following station constitutes the object of the present invention, namely a braking press 16, which, for each cut sheet 20 'and ", regulates the speed of advance of this sheet as a function of the variation in its thickness over its length and across its width. This braking makes it possible to wind the cut sheets 20 'and 20 "in good conditions at the next station consisting of the winding system 18 which carries out the winding of these sheets 20' and 20" on a winding cylinder 28

  can later be used to store the sheet metal it carries.

  In Figure 2 is schematically illustrated a brake press 40 of the prior art. This press 40 comprises a frame (not shown) on which are mounted an upper plate 42 and a lower plate 44 between which a cut sheet metal (sheet metal strip) 20 '(20 ") runs in a longitudinal direction parallel to the plane of the figure 2

  from left to right (see arrow).

  The lower plate 44 is fixed while the upper plate 42 is movable in vertical translation relative to the frame in order to allow a bringing together of said plates from an open position.

to a closed position.

  Each of the plates 42 and 44 has a free face forming a substantially horizontal working face (42a and 44a) facing the other plate and provided with braking means intended to brake said sheet in said closed position in which said

  braking means are in contact with said sheet.

  To this end, the working face 42a of the upper plate 42 is entirely coated with a stretched felt 46 forming a braking pad, the lateral edges 46a of the felt 46 being blocked. This blocking is achieved either by a pneumatic or hydraulic system 48, such as pneumatic clamps, or by a mechanical system. The example of such a mechanical system is illustrated in FIG. 2 in the form of a tensioning and blocking roller 50 on at least part of the periphery of which the corresponding lateral edge 46a is wound, the roller 50 being immobilized in an angular position so that it exerts some

traction on the felt 46.

  Regarding the lower plate 44, said braking means comprise, in addition to a felt 52 tensioned and locked (by a pneumatic or hydraulic system 48 or by a mechanical system - rollers -), an inflatable membrane 54 disposed in a housing 44b formed

  in the lower plate 44 and open in the direction of the upper plate 42.

  This inflatable membrane 54 is intended, when it is pressurized, to allow the felt to press on all the points of the surface of the cut sheet 20 '(20 ") which must be braked. is inflated under normal conditions of use, the membrane 54 protrudes from the housing 44b, beyond the face of

work 44a.

  However, this brake press 40 of the prior art does not achieve this objective since the edges 52a of the lower felt 52 are attached to fixed parts of the brake press 40. Consequently, despite pressurization, even important, of the inflatable membrane 54, the felt 52 can hardly deform according to variations in the thickness of the sheet 20 '(20 ") In addition, due to the mechanical stresses in tension and compression to which the felts are subjected 46 and 52 and due to the pollution of the felts by the filings coming off the lateral edges of the cut sheet 20 '(20 ") and of the machining liquid, we quickly notice

wear of these felts.

  The other systems which have been previously proposed, for example braking by belts wound around cylinders, have not made it possible to brake the laminated sheets with satisfactory material.

and cut out.

  Thus, the braking presses of the prior art have a certain number of drawbacks: the braking is little or not effective and the

  used felts wear out very quickly.

  The object of the present invention is to provide a braking press which makes it possible to pressurize a maximum of points of the

  surface of the cut sheet, preferably all points on its surface.

  For this purpose, the braking press for laminated sheets according to the present invention comprises a frame on which are mounted an upper plate and a substantially horizontal lower plate having a working face provided with braking means, at least one of the two plates being movable relative to the frame in order to allow approximation between said plates from an open position to a closed position, at least one sheet being able to run in a longitudinal direction between said upper and lower plates so that, in said closed position, said braking means of said upper and lower plates are in contact with

  said sheet in order to brake said sheet.

  This brake press is characterized in that said lower plate forms an open housing in the direction of said upper plate, in that said braking means of the lower plate comprise an inflatable membrane arranged in said housing projecting out of said housing beyond said working face, a thin plate surmounting said lower plate resting freely on said membrane, and a braking member fixed to a braking face of the

  thin plate facing towards the upper plate.

  In this way, it is understood that, thanks to the freedom of movement in the vertical direction and the flexibility of the thin plate, the felt of the lower plate can follow the variations in thickness of the sheet to be braked. Thus, most of the points on the underside of the sheet are in contact with the felt of the lower plate, therefore each zone of the surface of the sheet is under pressure, even low, between the plates

  upper and lower press.

  Preferably, the following advantageous arrangements are adopted: said braking member comprises a fabric connected to said thin plate and provided with gripping elements facing towards the upper plate, and a felt covering at least partially said fabric above said face of braking, said felt being composed of filaments capable of cooperating with said gripping elements in order to retain said felt on said fabric, - said braking member further comprises a fabric covering at least part of said braking face of the thin plate , said fabric being attached to said thin plate and said fabric being attached to said fabric at least at several points by covering at least part of said braking face, - said braking means of the upper plate consist of a braking member comprising a fabric provided with gripping elements facing towards the lower plate, said th cloth being fixed to said upper plate by covering at least said working face of said upper plate, and a felt covering at least partially said fabric opposite said working face, said felt being composed of filaments capable of cooperating with said gripping elements in order to retaining said felt on said fabric, said braking member of the upper plate comprises, in addition, a fabric covering at least part of said working face of the upper plate, said fabric being attached to said upper plate and said fabric being fixed on said canvas at least at several points covering at least part of said working face, and - said braking means of the upper plate are fixed

  to said upper plate by pneumatic means.

  The present invention also aims to provide a braking assembly for a braking press of the type of the prior art illustrated in FIG. 2 in order to make it conform to the press.

  according to the present invention (Figure 3).

  The braking assembly according to the present invention is characterized in that it comprises first braking means intended to equip said lower plate, said first braking means comprising a thin plate intended to overcome said lower plate by resting freely on said membrane , and a braking member fixed on a braking face of the thin plate turned towards the upper plate when said thin plate surmounts said

lower shelf.

  Preferably, the following advantageous arrangements are adopted: said braking member comprises a fabric connected to said thin plate and provided with gripping elements intended to come towards the upper plate, and a felt covering at least partially said fabric above said braking face, said felt being composed of filaments capable of cooperating with said gripping elements in order to retain said felt on said fabric, - said braking member further comprises a fabric covering at least part of said braking face of the thin plate, said fabric being attached to said thin plate and said fabric being attached to said fabric at least at several points covering at least part of said braking face, - the thin plate has a cross section and a longitudinal section in shape of inverted U, the base of the U being intended to cover said housing and the branches of the U being intended to extend on either side of said lower plate, the braking assembly further comprises second braking means intended to equip said upper plate, said second braking means comprising a fabric provided with gripping elements intended to be turned towards the lower plate, said fabric being intended to be fixed to said upper plate by covering at least said working face of said upper plate, and a felt covering at least partially said fabric opposite said face of work, said felt being composed of filaments capable of cooperating with said gripping elements in order to retain said felt on said fabric, - said braking member further comprises a fabric intended to cover at least part of said working face of the plate upper, said fabric being attached to said upper tray and said fabric being attached to said fabric at least at several points by covering at least part of said working face, - said fabric is sewn onto said canvas, - said felt has bevelled transverse edges, and - said thin plate is provided with perforations intended to

  come to be placed at least above said housing.

  The invention will be better understood, and features

  side effects and their advantages will become apparent during the description

  of an embodiment given below by way of example.

  It is understood that the description and the drawings are not given

  for information only and not limitative.

  Reference will be made to the accompanying drawings, in which - Figure 1, already described, is a longitudinal schematic representation of an assembly for the longitudinal cutting of laminated sheets; - Figure 2, already described, is a longitudinal sectional view of a braking press of the prior art; and, - Figure 3 is a sectional view identical to that of Figure

  2 showing the brake press according to the present invention.

  In FIG. 3, the elements identical to those previously described in relation to FIG. 2 bear numerical references

increased by a value of 100.

  Thus, the brake press 140 according to the present invention comprises an upper plate 142 movable in vertical translation relative to the frame and a lower plate 144 fixed relative to the frame, these

two plates being horizontal.

  As braking means, the working face 142a (lower face) of the upper plate 142 is covered with a canvas 160 surmounted by a fabric 162 provided with gripping elements turned in the direction of the lower plate ("VELCRO" type fabric ", Mark

filed) and a felt 146.

  The canvas 160 is a relatively resistant fabric (for example a thick fabric 2.4 mm thick made of 50% cotton and 50% polyamide and having a surface mass of the order of 1 Kg / m2) covering at least the working face 142a of the upper plate 142 to which it is fixed, for example by pneumatic or hydraulic systems 148 such as pneumatic clamps, or by a mechanical system. The fabric 162 is advantageously sewn onto the fabric 160. This fabric 162 comprises gripping elements preferably having a mushroom shape, this shape allowing a very good attachment of the felt as is explained below. The fabric 162 must also have a high resistance to mechanical, thermal and

chemical.

  The felt 146 forms the braking shoe of the upper plate 142 and is detachably retained on the fabric 162 thanks to the cooperation between the fibers making up this felt 146 and the aforementioned gripping elements. According to an essential characteristic of the present invention, unlike the felts that can be used in the braking systems of the prior art, this felt 146 is not stiffened by a coating of

  synthetic material, such as latex.

  Thus, the attachment of the felt 146 to the fabric 162 is guaranteed, the fibers of the felt can easily be retained by the elements.

grippers of the fabric 162.

  In this way, we understand that the change or the

  repositioning of the felt takes place very quickly.

  According to an advantageous arrangement, the felt 146 does not extend over the entire width of the upper plate 142, the width of the felt 146 preferably being substantially equal to that of the sheet 20 '(20 ") at

brake. -

  A change of felt may be necessary when the latter is worn or when it is not suitable for the 20 '(20 ") sheet to be braked, either because of the width of this 20' (20") sheet, or made of the nature of this 20 '(20 ") sheet. In the latter case, we adjust the hardness of the felt

  used depending on the type of sheet to be braked.

  Advantageously, use is made of a felt comprising polyester, polypropylene and polyethylene, the felt having undergone, as a finish, a thermal shock when hot which notably modifies its hardness. According to an essential characteristic of the present invention, the lower plate 144 comprises, in addition to braking means similar to those mentioned above in relation to the upper plate (fabric 164, fabric 166 and felt 152) an inflatable membrane 154 and a plate

thin 168.

  One could use an inflatable membrane and a lower plate similar to those of FIG. 2. However, advantageously the bottom of the lower plate 144 is provided with through holes 144c intended for the evacuation of the oil as will be explained later. . In addition, there is preferably a grid 170 under the membrane 154 in order to facilitate the flow of oil through the bottom of the housing towards the

holes 144c.

  The thin plate 168 is thin sheet having a thickness of about 1.5 mm and which completely covers the lower plate 144

without any fixation.

  In order to remain positioned above the housing 144a of the lower plate 144, this thin plate 168 has a cross section and a longitudinal section in the shape of an inverted U, the base of the U covering, by closing it, said housing 144a and the branches of the U extending on either side of the vertical side walls of said lower plate. Thus, the aforementioned branches limit the horizontal offset of the thin plate

  168 relative to the lower plate 144.

  The inflatable membrane 154 projecting, in normal use, beyond the upper edge of the lower plate 144, that is to say beyond the working face 144a, the thin plate 168 rests on this inflatable membrane 154. As this thin plate 168 is relatively thin, it is able to deform locally, under the pressure of the inflatable membrane 154, to follow the variations in thickness in width and in

length of the sheet 168.

  It is the upper face of the thin plate 168, which forms a face

  braking168a, which supports the canvas 164, the fabric 166 and the felt 152.

  The fabric 166 is sewn onto the canvas 164, the assembly being fixed to the thin plate 168 by means of pneumatic or hydraulic systems 148

  such as those mentioned above in relation to FIG. 2.

  The felt 152 is carried by the fabric 166 in the same way as the felt 146 is carried by the fabric 162: the preceding remarks concerning the advantages of the fixing by the gripping elements of

  the fabric 166 therefore remain valid.

  It therefore appears that a braking press of the prior art like that of FIG. 2 can easily be adapted in order to form a braking press according to the present invention, by using a braking assembly comprising in particular a thin plate simply placed

  without any fixation on the membrane of the lower plate.

  According to a particularly advantageous characteristic, the felts 146 and 152 have, between their two transverse edges, a width substantially equal to the width of said cut sheet 20 '(20 "), these transverse edges being bevelled. In this way, the bevelled edges wipe the longitudinal edges of the sheet loaded with oil and

  in filings from the cutting of this 20 '(20 ") sheet.

  According to another particularly advantageous characteristic, the thin plate 168 is provided with perforations 168b intended to be placed at least above said housing 144b of the lower plate. The thin plate 168 then forms a grid for wiping the felt 152 when the press 140 is in the closed position. Indeed, in this closed position, the free face 146a (152a) of the felt 146 (152) is in abutment

  against the upper (lower) face of the 20 'or 20 "sheet.

  In this case, the machining oil can be evacuated towards the housing 144b, the bottom of the housing 144b delimited in the lower plate 144a being provided with holes 144c for the evacuation of this oil.

for recycling.

  In order to adjust the minimum distance separating the two upper and lower plates 142 and 144 in the closed position, the press includes vertically adjustable stop means limiting the downward movement of the upper plate in said closed position. Such stop means consist for example in using

  cleats mounted on the lower plate.

  When using the brake press according to the present invention, when it is in the closed position, the upper and lower plates 142 and 144 then being separated by the minimum distance, it can be seen that the inflatable membrane 154 presses sufficiently against the thin plate 168, which is then sandwiched between the inflatable membrane 154 and the sheet 20 '(20 "), to allow localized deformation of this thin plate 168 while this inflatable membrane

  154 is under low air pressure.

  Thus it is found that an air pressure of 5 Pa is sufficient while a pressure of five to ten times greater used to inflate the membrane 54 of the press 40 of the prior art did not allow

  brake the 20 '(20 ") sheet correctly.

Claims (21)

  1. Brake press (140) for laminated sheets comprising a frame on which are mounted an upper plate (142) and a lower plate (144) essentially horizontal having a working face (142a, 144a) provided with braking means, l 'at least one of the two plates being movable relative to the frame in order to allow a rapprochement between said plates from an open position to a closed position, at least one sheet (20', 20 ") being able to slide in a longitudinal direction between said upper and lower plates (142, 144) so that, in said closed position, said braking means of said upper and lower plates are in contact with said sheet (20 ', 20 ") in order to brake said sheet , characterized in that said lower plate (144) forms a housing (144b) open in the direction of said upper plate (142), in that said braking means of the lower plate (144) comprise an inflatable membrane (154) disposed in said housing (144b) projecting from said housing (144b) beyond said working face (144a), a thin plate (168) surmounting said lower plate (144) while resting freely on said membrane (154), and a braking member fixed on a braking face (168a) of the thin plate (168) turned in   direction of the upper plate (142).   2. Press according to claim 1, characterized in that said braking member comprises a fabric (166) connected to said thin plate (168) and provided with gripping elements turned towards the upper plate (142), and a felt ( 152) covering at least partially said fabric (166) above said braking face (168a), said felt (152) being composed of filaments capable of cooperating with said gripping elements in order to retain said felt (152) on said fabric (166).   3. Press according to claim 2, characterized in that said braking member further comprises a fabric (164) covering at least part of said braking face (168a) of the thin plate, said fabric (164) being attached to said thin plate (168) and said fabric (166) being fixed on said fabric (164) at least at several points in   covering at least part of said braking face (168a).   4. Press according to any one of the claims   previous, characterized in that the thin plate (168) has a cross section and a longitudinal section in the shape of an inverted U, the base of the U covering said housing (164) and the branches of the U   extending on either side of said lower plate (144).   5. Press according to any one of the claims   previous, characterized in that said braking means of the upper plate (142) consist of a braking member comprising a fabric (162) provided with gripping elements facing towards the lower plate (144), said fabric (162) being fixed to said upper plate (142) by covering at least said working face (142a) of said upper plate (142), and a felt (146) covering at least partially said fabric (162) opposite said working face, said felt (146) being composed of filaments capable of cooperating with said gripping elements in order to retain said felt (146) on said fabric (162).   6. Press according to claim 5, characterized in that said braking member further comprises a fabric (160) covering at least part of said working face (142a) of the upper plate (142), said fabric (160 ) being attached to said upper plate (142) and said fabric (162) being fixed on said fabric (160) at least at several points   by covering at least part of said working face (142a).   7. Press according to claim 3 or 6, characterized in that   said fabric (162, 166) is sewn onto said canvas (160, 164).   -8. Press according to any one of the claims   above, characterized in that said felt (146, 152) has, between two transverse edges, a width substantially equal to the width of said sheet (20 ', 20 ").   9. Press according to claim 8 characterized in that   said transverse edges of the felt (146, 152) are bevelled.   10. Press according to any one of the claims   previous, characterized in that said thin plate (168) is provided   perforations located at least above said housing (144b).   11. Press according to any one of the claims   previous, characterized in that said braking means of the upper plate (142) are fixed to said upper plate (142) by pneumatic means.   12. Press according to any one of claims   previous, characterized in that said upper plate (142) is movable in vertical translation relative to the frame, in that said lower plate (144) is fixed relative to the frame and in that it further comprises means vertically adjustable stops limiting the downward movement of the upper plate (142) in said closed position. 13. Braking assembly for a brake press (140) comprising a frame on which are mounted an upper plate (142) and a lower plate (144) essentially horizontal, said lower plate (144) forming a housing (144b) open in direction of said upper plate (142) in which there is an inflatable membrane (154) projecting from said housing (144b), at least one of the two plates being movable relative to the frame in order to allow a bringing together between said plates from an open position to a closed position, at least one sheet (20 ', 20 ") capable of running in a longitudinal direction between said upper and lower plates (142, 144) so that, in said position closing, said sheet is braked, characterized in that it comprises first braking means intended to equip said lower plate (144), said first braking means comprising a plate m ince (168) intended to overcome said lower plate (144) by resting freely on said membrane (154), and a braking member fixed on a braking face (168a) of the thin plate turned towards the upper plate (142)   when said thin plate (168) surmounts said lower plate (144).   14. A braking assembly according to claim 13, characterized in that said braking member comprises a fabric (166) connected to said thin plate (168) and provided with gripping elements intended to come towards the upper plate (142), and a felt (152) covering at least partially said fabric (166) above said braking face (168a), said felt (152) being composed of filaments capable of cooperating with said gripping elements in order to retain said felt (152) on said fabric (166).   15. Braking assembly according to claim 14, characterized in that said braking member further comprises a fabric (164) covering at least part of said braking face (168a) of the thin plate, said fabric (164 ) being attached to said thin plate (168) and said fabric (166) being fixed on said fabric (164) at least at several points by covering at least part of said braking face (168a).   16. Braking assembly according to any one of   claims 14 and 15, characterized in that the thin plate (168)   has a cross section and a longitudinal section in the shape of an inverted U, the base of the U being intended to cover said housing (164) and the branches of the U being intended to extend on either side of said lower plate (144).   17. Braking assembly according to any one of   Claims 14 to 16, characterized in that it further comprises   second braking means intended to equip said upper plate (142), said second braking means comprising a fabric (162) provided with gripping elements intended to be turned in the direction of the lower plate (144), said fabric (162) being intended to be fixed to said upper plate (142) by covering at least said working face (142a) of said upper plate (142), and a felt (146) covering at least partially said fabric (162) opposite said working face, said felt (146) being composed of filaments capable of cooperating with said gripping elements in order to retain said felt (146) on said fabric (162).   18. Braking assembly according to claim 17, characterized in that said braking member further comprises a fabric (160) intended to cover at least part of said working face (142a) of the upper plate (142), said fabric (160) being attached to said top plate (142) and said fabric (162) being attached to said fabric (160) at least at several points by covering at least a portion of said working face (142a).   19. Braking assembly according to claim 15 or 18, characterized in that said fabric (162,166) is sewn on said fabric (160.164).   20. Braking assembly according to claim 15 or 18, characterized in that said felt (146, 152) has edges bevelled cross sections.   21. Braking assembly according to any one of   claims 13 to 20, characterized in that said thin plate (168)   is provided with perforations (168b) intended to be placed at least at least above said housing (144b).