Classifications

• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
  • B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
  • B21D7/00—Bending rods, profiles, or tubes
  • B21D7/02—Bending rods, profiles, or tubes over a stationary forming member; by use of a swinging forming member or abutment
  • B21D7/024—Bending rods, profiles, or tubes over a stationary forming member; by use of a swinging forming member or abutment by a swinging forming member
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
  • B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
  • B21D7/00—Bending rods, profiles, or tubes
  • B21D7/02—Bending rods, profiles, or tubes over a stationary forming member; by use of a swinging forming member or abutment
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B26—HAND CUTTING TOOLS; CUTTING; SEVERING
  • B26D—CUTTING; DETAILS COMMON TO MACHINES FOR PERFORATING, PUNCHING, CUTTING-OUT, STAMPING-OUT OR SEVERING
  • B26D3/00—Cutting work characterised by the nature of the cut made; Apparatus therefor
  • B26D3/16—Cutting rods or tubes transversely
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B26—HAND CUTTING TOOLS; CUTTING; SEVERING
  • B26D—CUTTING; DETAILS COMMON TO MACHINES FOR PERFORATING, PUNCHING, CUTTING-OUT, STAMPING-OUT OR SEVERING
  • B26D3/00—Cutting work characterised by the nature of the cut made; Apparatus therefor
  • B26D3/16—Cutting rods or tubes transversely
  • B26D3/161—Cutting rods or tubes transversely for obtaining more than one product at a time

Definitions

• Profile bending device comprising profile bending tools and a cutting tool for these profiles.
• the invention relates to a device for bending profiles such as tubes, comprising, on the one hand, tools for bending profiles, and on the other hand, a cutting tool for these profiles after bending (s).
• the current bending devices are adapted to move the profiles along a longitudinal axis (X) and comprise a bending head mounted on means for rotating said bending head about a bending axis. (Z), provided, on the one hand, with one or more bending stage (s) each equipped with a bending form / clamping jaw assembly, and secondly, with a stage of cutting of the curved sections distinct from the bending stages.
• each bending stage comprises, in order to carry out the bending operations:
• a clamping jaw Associated with each form of bending, a clamping jaw comprising a clamping impression of the profile complementary to the impression of said bending form,
• ⁇ means for moving each clamping jaw along a so-called transverse axis (Y) relative to the associated bending shape, between a clamping position contiguous to said bending form and an open position spaced from this bending form.
• each blank jaw a form of bending pierced by a through opening through a slot in the cavity of said bending form, and arranged so as to extend in the continuity of the through-light of the said bit clamp,
• ⁇ a cutter associated with each jaw pair Serre blank / bending form, having a cutting end forming at least one cutting edge extending in the plane (X, Y),
• the present invention aims to overcome this drawback and its main purpose is to provide a bending device designed to reduce the time of the final cutting step of this section, and to achieve, in this final step, a clean cut and frank profile.
• the invention is directed to a bending device of the type described in the preamble above, further comprising, associated with each pair of jaw-jaws / bending form, a second cutting member, said mowing member. -coupe, adapted to be actuated before the cutting member, and having a cutting end forming at least one cutting tip, and moving means of this pre-cutting member in the plane (Y, Z):
• the clamping jaw comprising, communicating with the impression of said jaw clamp by the slot opening into the latter, a conduit adapted to guide the pre-cutting member during the displacement of the latter,
• the displacement means of the cutting member being adapted to determine a bending position in which said cutting member is retracted back from the guide duct of the pre-cut member.
• each bending (s) / cutting stage is therefore equipped with a pre-cutting member and a cutting member, and designed to enable these two members to be actuated successively so as to produce a primer. cutting in a specific area of the profile and then the total cutting of this profile.
• the displacement means of each pre-cutting member are adapted to move the latter in a circular path centered on a point on the transverse axis (Y).
• Such a trajectory leads, in fact, during the pre-cut, to remove the maximum of material in the vicinity of the generatrix profiles extending in the plane (X, Y), that is to say at the level of the zone "attacked” then by the cutting member.
• the guide duct of said pre-cutting member is delimited, according to the transverse axis (Y), by a convex wall forming a span guiding said pre-cutting member, pierced with a slot extending in the plane (Y, Z) for guiding the cutting member.
• the means for moving each jaw jaw are dissociated from the actuating means of the cutting members and for this purpose:
• the means for moving each jaw clamp comprises a carriage on which is mounted said jaw clamp, and means for translational movement of said carriage along the transverse axis (Y),
• the cutting member and the pre-cutting member are mounted on the carriage and are associated with displacement means adapted to move them along the transverse axis (Y) relative to said carriage.
• the cutting member is carried by a support block associated with the movement means of said support block along the transverse axis (Y) relative to the carriage,
• the means for moving the pre-cutting member comprise a connecting rod system connecting said pre-cutting member to a roller cooperating with a cam mounted on the support block.
• the cam advantageously consists, according to the invention, of a groove cam adapted to extend laterally with respect to the cutting element, between the support block and the blank jaw, the connecting rod system comprising a crank adapted to transform the translation movement of the roller guided by the grooved cam in a rotational movement of the pre-cut member.
• each clamping jaw is adapted to also generate the movements of the cutting member, and these moving means are, in addition, dissociated from the means of cutting. actuation of the pre-cut member.
• each clamping jaw is coupled to support means:
• the pre-cutting member is associated with displacement means comprising an actuator adapted to generate the movements of said pre-cut member.
• actuator control means are adapted to control a displacement of the pre-cut member in a forward path, in order to achieve the pre-cut, then to control the movement along the return path, after actuation of the cutting member.
• the actuator advantageously consists according to the invention in a fluidic jack coupled respectively to the support means of the cutting member and the clamp jaw, and adapted, firstly for its deployment causes a displacement according to the forward path of the pre-cutting member, and secondly to exert a stop force against the jaw clamp, first in its deployed state, and secondly during its retraction and deployment resulting from displacements support means of the cutting member relative to the jaw clamp, generating the section of the section.
• each cutting member is carried by a carriage attached to a support block to which the means for moving the jaw clamp are associated along the transverse axis (Y),
• the retractable connecting members arranged between each blank jaw and the support means of the cutting member comprise:
• At least one jack referred to as an abutment ram, extending longitudinally between the jaw clamp and the support block, a cylinder known as a cutting cylinder, arranged to abut against the carriage carrying the cutting member in such a way, during its deployment, to exert on the said carriage a force tending to detach it from the support block,
• FIG. 1 is a perspective view, at a first angle of view, of a bending form and guide members of a profile fitted to a bending head according to the invention
• FIG. 2 is a perspective view, at a second angle of view, of this form of bending and of these guide members,
• FIG. 3 is a perspective view of a blank jaw / support means assembly of this blank jaw according to a first embodiment of a bending device according to the invention
• FIG. 4 is a longitudinal side view, with partial tears, of this set of jaws holding blanks / support means of said blanking jaw,
• FIG. 5 is a longitudinal side view of this blank jaw / support means assembly of said blank holder jaw
• FIG. 6 is a perspective view with partial snatchings of this jaw clamp / support means assembly, on which is diagrammatically represented the feed circuit of the thrust cylinders,
• FIG. 8 is a diagram of the power supply circuit of this jaw clamp assembly / support means
• FIGS. 9a-9c are perspective views showing three steps in the operation of this jaw clamp assembly / support means
• - And Figure 10 is a perspective view of a blank jaw / support means of this jaw clamp according to a second embodiment of a bending device according to the invention.
• the bending devices according to the invention shown by way of examples respectively to FIGS. 1 to 9 and FIG. 10, consist of machines for bending a section carried by displacement means (not shown) able to move it along an axis.
• horizontal displacement (X) and comprising, for example, either a clamp associated with means for driving the latter along the longitudinal axis (X), or a 6-axis robot of the type described in patent FR2914203.
• the bending head is described in its initial loading position of a profile in which the clamping impressions of the bending form and the jaw clamps. blanks are oriented on the longitudinal axis (X) of movement of the profiles, and the transverse axis (Y) of displacement of the clamp jaw is orthogonal to this longitudinal axis (X).
• the bending head comprises, firstly, a strip 1 having a longitudinal groove 2 for supporting and guiding the profiles, carried by means (not shown) of displacement of the said strip along a longitudinal axis parallel to the axis (X) and along a horizontal transverse axis (Y) orthogonal to the plane (X, Z), (the axis Z representing the axis of bending consisting of the axis of rotation of the bending head orthogonal to the X axis).
• This bending head also comprises an erase-fold 3 with a guide groove, intended to cooperate with the strip 1 for the support and guidance of the profiles.
• This erase-fold 3 is attached to the bending form of this bending head which comprises, firstly, a cylindrical roller 4 secured to a circular plate 5 adapted to be mounted on means (not shown) for rotating drive said cylindrical roller 4 about the bending axis (Z).
• This cylindrical roller 4 has a peripheral groove 7 and has a notch 6 of L-shaped section delimited by two perpendicular walls and extending at the level of the plate 5.
• a groove 8 extending along an axis parallel to the axis (Z) is formed in the wall of the notch 6 parallel to the axis (X), said groove housing the amount of a rail 9 T-shaped
• clamping jaw 10 of rectangular parallelepiped shape, called clamping jaws, including:
• the cavity 11 forms, in addition, a 90 ° elbow with a branch 11a centered on the longitudinal axis (X) and a branch 11b perpendicular to said longitudinal axis (X).
• clamping jaw 10 is pierced with a through slot 13 extending between the end faces 10a, 10c so as to open, on the one hand, in the branch 11a of the cavity 11, and on the other side. on the other hand in the groove 7 of the cylindrical roller 4.
• the end face 10a is pierced with four blind holes, said centering holes, such as 14, each formed in the area of one of the peaks of this end face.
• the bending head according to the invention also comprises a clamping jaw, said clamp jaw, of the same shape and dimensions as the clamping jaw 10.
• this clamp jaw 15 has a front face 15a in which is formed a clamping impression 16 conjugate of the impression 11 and thus having the shape of a bend formed of two branches 16a, 16b perpendicular.
• this jaw clamp 15 is pierced with a through slot 17 extending between its end faces so as to open into the branch 16a of the cavity 16, in the continuity of the slot 13 formed in the counter- clamping jaws 10.
• this jaw clamp 15 comprises four centering pins such as 18 adapted to be housed in the centering orifices 14 of the jaw 0 during the coupling of these two elements.
• This jaw clamp 15 is associated with a support block 19 of substantially cubic shape adapted to be mounted on means (not shown) for moving the jaw clamp assembly 15 / support block 19 along a so-called transverse axis (Y ) relative to the bending form 10.
• this support block 19 comprises, opposite the clamp jaw 15, a front face in which is formed a rib adapted to house a rail 20 hooking of said support block.
• the bending device further comprises a carriage 25, which is attached to the support block 19, between the latter and the holder jaw 15, on the one hand, equipped with ball bushes such as 26 arranged to allow said carriage to slide. along the rods 21-23, and secondly, on which is secured a cutting blade 27 having a tip-shaped end portion oriented on the plane (X, Y), embedded in the front face of the carriage 25 opposed to the support block 19 so as to extend orthogonally relative thereto.
• This bending device comprises, moreover, three hydraulic stop cylinders 28-30 disposed between the clamping jaw 15 and the support block 19, comprising a jack rod 31 having a threaded end 31a for securing said rod with the jaw clamp 15, and an opposite end forming a piston 32 housed in a cylinder chamber 33 arranged longitudinally in the support block 19.
• the three chambers 33 are, furthermore, fed from connection ports 34-36 by conduits such as 37 connecting, on the one hand, said orifices, and on the other hand, the three chambers 33.
• the bending device also comprises a cutting cylinder 38 adapted to urge the carriage 25 so as to deploy, to exert on said carriage a force tending to take it off the support block 19.
• this cutting cylinder 38 comprises a rod 39 provided with an end forming a piston 40 housed in a cylinder chamber 41 arranged longitudinally in the support block 19, so as to open opposite the carriage 25, and fed from a connection port 42.
• the three stop cylinders 28-30 and the cutting cylinder 38 are connected so as to form a closed hydraulic circuit incorporating a distributor 43 and a unidirectional flow restrictor 44 .
• Such a closed hydraulic circuit is adapted, in the first place, in a first position of the distributor 43, to maintain, under fluid pressure, the stop cylinders 28-30 in their deployed position, in particular making it possible to bend in the usual manner a section maintained enclosed between the clamping jaw 10 and the clamp jaw 15.
• a switching of the distributor 43 made to start the cutting operation leads, on the other hand, to allow the emptying of the chamber 33 of each of the stop cylinders 28-30, during the displacement of the support block 19 generated by the means moving the jaw clamp assembly 15 / support block 19 along a so-called transverse axis (Y) relative to the bending form 4, 10.
• the flow rate of the fluid during this emptying is furthermore regulated by the flow restrictor 44, so that the holding jaw 15 is held pressed against the clamping jaw 10 with a pressing force determined by this reducing gear. flow 44, thus conferring on the said blank jaw a blank press function for cutting the profile by means of the cutting blade 27.
• the jaw jaw 15 is split into two blocks 15b, 15c adapted to:
• - To confer a removable character to said blank jaw to modify the shape of the footprint 16, - Delimit a chamber 47 communicating with the slot 17 opening into the cavity 16, forming a conduit adapted to guide a pre-cutting member 45 having a cutting end forming at least one cutting tip, actuated so to be moved in a plane (Y, Z):
• the chamber 47 is delimited posteriorly by a wall 48 provided with a convex front face 48a forming a guide surface of the pre-cutting member 45, said wall being pierced with a slot 49 extending in the plane (Y, Z) for guiding the cutting member 27.
• the actuating means of the pre-cutting member 45 comprise, in turn:
• crankpin 56 on which is mounted the pre-cut member, the crankpin 56 consists of a shaft extending along an axis
• the drive pinion 54 has a V-shaped notch 54a inside which is positioned a fixed stop 57 also having the shape of a V.
• All of these actuating means and in particular the angle at the apex of this notch 54a, the shape of the abutment 57 and the arrangement of the jack 50, are adapted so that the rotations of the driving pinion 54, generated by the actuation of the cylinder 50, cause displacements of the pre-cutting member 45 between its high position in the retracted state of the jack 50, and its low position in the deployed state of the jack 50.
• the distributor 43 is switched to its holding position of the cutting blade 27 in its retracted position, and the cylinder 50 maintained in its retracted state which corresponds to the upper position of the pre-shaped member. cut 45.
• an additional displacement of the support block 19 is controlled, after switching of the distributor 43 in its position capable of generating a relative displacement of the carriage 25 with respect to the block support 19, and therefore a displacement of the cutting blade 27 causing cutting of the profile.
• the power supply of the jack 50 is adapted so that the displacement of the support block 19 to which the body 50a of said jack is secured results in the retraction of this jack 50.
• this jack 50 applies a holding force to the holding jaw. flan 15 resting against the clamping jaw 10.
• the following step controlled once the section has been cut, consists in controlling the recoil of the support block 19, during which the holding jaw 15 is held in abutment against the clamping jaw 10 by the jack 50 fed in such a way to deploy due to said recoil of the support block 19.
• the distributor 43 is switched again so that the initial retraction of the support block 19, performed with the clamp jaw 15 held in abutment against the clamping jaw 10 by the jack 50, leads to a relative approximation of the carriage 25 and the support block and therefore a retraction of the cutting blade 27.
• the last step consists in controlling a supply of the jack 50 adapted to cause the retraction of said jack, and therefore to cause the displacement of the pre-cutting member 45 to its initial high position shown in Figure 9a.
• the blank jaw 61 comprises, like the preceding one, a front face in which a clamping cavity 62 is formed in which a slot 63 communicating with a guide chamber a pre-cutting member (not shown in FIG. 10).
• the blank jaw 61 is secured to a carriage 64, in the example shown in the form of a plate, the movements of which are adapted to allow said blanking jaw to be brought into either a clamping position contiguous to the bending form 10, or in an open position spaced from this bending form.
• the cutting member 66 consists of a cutting blade similar to that described above, carried by a support block 65 associated with drive means of said support block able to move it along the transverse axis ( Y) along the carriage 64, between an active cutting position of a profile housed in the cavities 11, 62 of the pair of clamp jaws
• these drive means of the support block 65 consist of a ball screw 70 secured to said driven support block, by means of a transmission formed by two pinions 68, 69, by an electric motor 67.
• the means for moving the pre-cutting member comprise:
• a grooved cam 72 formed in a plate 71 fixed laterally on the support block 65, so that said groove extends laterally with respect to the cutting member 66, between said support block and the jaw clamp.
• the groove of the groove cam consists of two parallel end sections 73, 74 extending along axes (y) and offset relative to each other along an axis (z), connected by an inclined section 73 determining the amplitude of the rotation of the crank 77.
• the cutting primer and the cutting are performed by controlling the activation of the electric motor 67, so as successively to cause:
• the two embodiments of the invention described above therefore provide bending devices designed to reduce the time of the final cutting step of this section, and to achieve, in this final step, a clean cut and frank profile.

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• Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• Life Sciences & Earth Sciences (AREA)
• Forests & Forestry (AREA)
• Bending Of Plates, Rods, And Pipes (AREA)

Applications Claiming Priority (2)

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• 2015
  • 2015-06-24 FR FR1501324A patent/FR3037828A1/fr not_active Withdrawn
• 2016
  • 2016-06-23 CN CN201680047871.6A patent/CN107921503A/zh active Pending
  • 2016-06-23 WO PCT/FR2016/000106 patent/WO2016207499A1/fr active Application Filing
  • 2016-06-23 EP EP16741654.4A patent/EP3313593B1/de active Active
  • 2016-06-23 US US15/742,966 patent/US10675666B2/en active Active

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