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
  • B21D7/022—Bending rods, profiles, or tubes over a stationary forming member; by use of a swinging forming member or abutment over a stationary forming member only

Definitions

• the present invention relates to a machine for bending tubes in series and at a high rate.
• These devices include a shape having the desired radius of curvature, and a counterform capable of being displaced coaxially with said shape, around its periphery, by driving the tube to be bent which is wedged between said shape and said counter shape, so as to wrap it on said shape.
• a tube cannot be bent or bent in the same way as a wire is, since because of its axial channel, a tube is likely to be crushed.
• the form and the counter-form each have a groove of cross section in an arc of a circle with a radius of curvature corresponding to the diameter of the tube to be bent.
• the counter-form is in the form of a block movable in pivoting in a limited manner, and in which the groove is formed longitudinally, or else a grooved roller mounted in free rotation. The bending operation is carried out while the tube is in contact with the bottoms of the two grooves.
• the present invention relates more particularly to machines which allow the bending of tubes in series and at a high rate, these tubes being in particular intended for the production of chassis.
• These machines comprise a means 1 landscape of the tube which supplies a bending head provided with movable bending tools to each other.
• the present invention aims to remedy the various aforementioned drawbacks, by proposing a machine for bending a tube, which allows high working rates, and which in particular allows bending a tube at 180 °, without risk of crushing of the tube.
• the machine for bending a tube in series and at a high rate comprises a bending head comprising a shape and a counter-shape which at the periphery have a groove of semi-circular section, as well as means allowing 'driving said counter-form in rotation coaxial with said form so as to drive the tube to be bent and to wind it on said form, and it is essentially characterized in that said form consists of a disc having a cutaway arranged in a cord of said disc, and in that it comprises means making it possible to move said disc bending head relative to the axis of the tube, along a path passing through the axes of said form and counter-form, as well as means making it possible to rotate said form axially, independently of the movement of said counter-form.
• the means making it possible to move the bending head relative to the tube, drive the latter along a rectilinear trajectory.
• the means making it possible to move said bending head relative to the tube drive the latter along a curved path.
• the counterform consists of a roller.
• the counterform consists of a pressure block.
• the means making it possible to move the bending head relative to the tube, and the means making it possible to rotate the shape axially consist of stepping motors numerically controlled.
• the cambering head is carried by an arm movable in pivoting, on which it is movable in pivoting coaxially to the shape, the latter being mounted movable in axial pivoting on said head bending.
• FIG. 1 shows a partial schematic view of a machine for bending tubes.
• Figures 2a, 2b, 2c and 2d show partial schematic views of the same machine during different successive phases of a bending operation.
• FIG. 1 represents the bending head 1 of a machine according to the invention, on which is placed a tube 2 held by a fitting means, not shown, which consists of an element capable of holding the tube 2 and to drive it axially in one direction as in the other as shown by the double arrow X.
• the bending head 1 has a shape 3 and a counter shape 4, between which the tube 2 passes.
• Form 3 consists of a disc having a cutaway 30 arranged along a cord, while its curved edge 31 has a groove 32, of which only the bottom 33 is shown by transparency, of semi-circular cross section with radius equal to that of tube 2.
• the counterform 4 consists of a roller mounted idle on a shaft 40, and which has a groove 41 at the periphery, of which only the bottom 42 is shown by transparency, of semi-circular cross section also of the same radius as that of the tube 2.
• the form 3 is mounted in rotation on the bending head 1 by means of a shaft 34 capable of being driven in rotation by a motor means, not shown, so as to rotate the form 3 axially with respect to the head camber 1, in one or the other direction, according to the double arrow Y.
• the bending head 1 is carried by an arm, not shown, on which it can, by means of motor means, also not shown, pivot coaxially to the axis of rotation of the form 3, in a direction as in 1 other, according to the double arrow Z.
• the arm which carries the bending head 1
• the fitting means of the tube 2 so that it describes a trajectory passing through the shafts 34 and 40.
• this trajectory which is materialized by the double arrow R, is curved, it results from the pivoting of the arm. It should be noted that this trajectory can preferably be rectilinear, which can however make the construction of the machine more complex.
• the dimensions of the form 3 and the counter-form 4, their center distance, as well as the height of the rope according to which the cutaway 30 is made, are such that, when the cutaway 30 is in line with the counter-shape 4 , there remains between the form 3 and the counter-form 4 a space at least equal to the diameter of the tube 2.
• FIGS. 2a, 2b, 2c and 2d we can see different phases of a bending operation of the tube 2, knowing that FIG. 1 represents a preliminary phase where the cutaway 30 is in line with the counterform 4 and the bending head 1 is positioned so that the tube 2 comes into contact with the cutaway 30.
• the next phase consists in rotating the form 3 along Y A so that the tube 2, which is in the locking position in the axial direction, is engaged in the groove 32, then in blocking the form 3 in this position relative to the bending head 1.
• the tube 2 is thus clamped between the form 3 and the counter-form 4, in the grooves thereof 32 and 41 respectively.
• the grooves 32 and 41 are preferably semi-circular, and of a diameter equal to that of the tube 2, so that there is a close contact between the tube 2 and the bottoms 33 and 42 of the grooves, respectively 32 and 41.
• the depth of the grooves 32 and 41 is equal to the radius of the tube 2
• the height of the cord along which the cutaway 30 is made is equal to the diameter of the tube.
• the tube 2 by immobilizing it on the form 3 by means of the counter-form 4, which in this case may not be a roller but a locking means such than a pressing block for example, and by combining on the one hand a rotation of the bending head 1 according to Z B synchronized with a rotation according to Y B of the form 3 having previously rotated it according to Y A so as not to not wind the tube 2 on the cutaway 30, and on the other hand a proportional advance movement of the tube 2 along X.
• the counter-form 4 which in this case may not be a roller but a locking means such than a pressing block for example
• This variant makes it possible in particular to bend a tube close to its end, or near a bend or a discharge.
• FIG. 2d it can be seen that, after bending the tube 2, the latter is moved axially, the counterform 4 has been brought back to its starting position by a rotation in the direction Z A , the shape 3 has turned in direction Y B to bring the cutaway 30 parallel to the tube 2, and the bending head 1 has been moved in the direction R A so that the cutaway 30 comes into contact with the tube 2 and that the latter sort of groove 41, so that the tube 2 can, after cutting, be released laterally.

Landscapes

• Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• Bending Of Plates, Rods, And Pipes (AREA)
• Shaping Of Tube Ends By Bending Or Straightening (AREA)

Applications Claiming Priority (3)

Publications (2)

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ID=8848419

Family Applications (1)

Country Status (9)

Cited By (1)

Families Citing this family (7)

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• 2000
  • 2000-03-23 FR FR0003706A patent/FR2806647B1/fr not_active Expired - Fee Related
• 2001
  • 2001-03-22 AU AU46624/01A patent/AU4662401A/en not_active Abandoned
  • 2001-03-22 DE DE60111237T patent/DE60111237T2/de not_active Expired - Fee Related
  • 2001-03-22 US US10/239,260 patent/US6782728B2/en not_active Expired - Fee Related
  • 2001-03-22 AT AT01919545T patent/ATE296692T1/de not_active IP Right Cessation
  • 2001-03-22 WO PCT/FR2001/000873 patent/WO2001070425A1/fr active IP Right Grant
  • 2001-03-22 ES ES01919545T patent/ES2243472T3/es not_active Expired - Lifetime
  • 2001-03-22 BR BR0109486-6A patent/BR0109486A/pt not_active IP Right Cessation
  • 2001-03-22 EP EP01919545A patent/EP1311356B1/de not_active Expired - Lifetime

Non-Patent Citations (1)

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