FR2485407A1 - MACHINE FOR FORMING LOW DIAMETER PIPES - Google Patents

Abstract

THE INVENTION RELATES TO A MACHINE FOR FORMING LOW-DIAMETER PIPES. THE MACHINE INCLUDES A FRAME 1 EQUIPPED WITH A TRANSVERSE TABLE SUPPORTING A FIXED LOWER JAW AND A MOBILE UPPER JAW 19 BETWEEN WHICH IS ROTARY MOUNTED A SLOTTED FORMING CHUCK DRIVEN IN ROTATION BY THE INTERMEDIATE OF TWO 12 AND 13 TOOTHED WHEELS A MOTOR-REDUCER GROUP 14, THE ADJUSTMENT OF THE DISTANCE OF THE JAWS FROM THE CHUCK BEING RESPECTIVELY PROVIDED BY SCREWS 18 AND 30 WHILE THE CYLINDERS ENSURE THE OPENING AND CLOSING OF THE SAID JAWS. APPLICATION TO THE FORMING OF TUBES WITH A DIAMETER LESS THAN 100 MM.

Description

The present invention relates to a machine for

sea pipes of small diameter.

  The invention applies more particularly to

forming of pipes by rolling.

  At present, the molding of pipes by rolling is carried out by means of spring rollers supported at their ends without the possibility of reinforcing them in their median part. During the driving work and taking into account the

  important efforts put into play, the working rolls

  and it is difficult to get- perfect hoses-

  cylindrical, especially in small diameters.

  Various solutions have already been proposed to re-

  weld this problem of buckling of formers rollers and for

  compensate for bending of these. A first solution to

  to give them a domed shape but this is only a

  worse and the results obtained are far from being total-

satisfactory.

  In a rolling machine known as "pyramidal roll", and which has three rollers arranged in the form of a pyramid, the rolling diameter is of the order of three

  to four times the diameter of the forming roll which, of course,

  can not fall below a minimum value of

  order of 80 to 100 mm. As a result, the minimum diameter

  between 250 and 400 m, which is

  clue the formation of small diameter pipes, lower

especially at 100 - "m.

  With the leveling machines currently known,

  better results are obtained because the half diameter

  The rolling average is between 1/2 and 2 times the diameter of the glider roller. With these machines, we come down

  at minimum diameters of tubes between 120 and 150 -'m.

  According to another machine also known, the f or-

  mage is performed by a small diameter roller

  strongly applied on a large roll coated with polyurethane

  born. With this machine, one can get diameter tubes

between 100 and 130 me.

  Finally, according to one last known machine, the

  mage is performed by three polyurethane rollers,

  distributed in a triangle around a roller forming

  2. tit diameter, this machine making it possible to obtain tubes

  good cylindricity but with a minimum diameter of

  is determined by the diameter of the pressure rollers in

  polyurethane that come into mutual contact when

  cracks in small diameters. Nevertheless, perfect tubes can be obtained in diameters between 80 and mm, but the cost of the machine is greatly inflated by the need to have three rollers.

may deviate.

  The object of the present invention is therefore to

  to set a machine for forming with a perfect cylindricity small diameter pipes lower than mm, said machine to be robust and a weak

cost of implementation.

  According to the invention, the pipe forming machine

  small diameter, in particular by rolling, comprises a frame

  sis, a forming roller rotatably mounted on the chassis and

  means for rotating said roller, this machine

  further comprising, according to the invention, jaws of

  formed around the forming roll so as to en-

  velopper it, as well as ways to move the

  your jaws in relation to the roller.

  According to a preferred embodiment, the machine comprises two jaws diametrically opposite to the forming roll, one being fixed and the other mobile on the frame, while the forming roll is itself

  articulated on said frame to be able to deviate from the

fixed choir.

  The movable jaw is preferably carried by

  at least one support articulated on the chassis, this support can

  to be a lever carrying the jaw at one end,

  say that actuating means such as cylinders are connected to the other end of said levers. To adjust the gap between the jaws and the roller

  they are wrapped, they are mounted

  in adjustment slides and means of adjustment.

  ge of the spacing such as screws are associated with said slides. Finally, preferably, the forming jaws 3.

  each have a V-shaped groove that extends along the

  forming water over substantially its entire length, while

  said roller consists essentially of a center mandrel

  tral rotatably mounted on which is slipped end a man-

  chon rotating equipped at one end with driving means

  in rotation such as a toothed wheel.

  The invention will now be described in greater detail.

  tail with reference to a particular embodiment, hereinafter

  as a non-limitative example and represented on the

  in which Figs. 1 represents a front view of the machine

  forming the pipes according to the invention.

  Fig. Fig. 2 shows a side view of the machine of Fig. 1, and Fig. 3 shows a section of the machine according to

line III-III of FIG.

  As shown in FIG. 1, the machine according to the invention comprises a frame 1 on which is mounted a rotating forming roll 2 extending over the entire length

  said frame and protruding laterally cantilevered from a side

  the latter, said roll being hinged to the frame

  turn of a horizontal axis 4 and having its end door-to-door

  false mounted in a fixed bearing 5 fixed at the end of an arm 3

  extending in the extension of the roller 2.

  The other end of the arm 3 attached to the bearing 5 is hinged to a connecting piece 6 itself hinged to the end of the vertical rod of an actuating cylinder 7 whose body is also articulated at its base on a base

fixed 8.

  As shown in FIGS. 1 and 3, the forming roll 2 essentially consists, in a conventional manner,

  a central forming mandrel 9 which extends along the housing

  1 between a removable side bearing 10 located on the right in FIG. 1 and a rotary sleeve Il of left in which

  the corresponding end of the mandrel is fitted and

  vetée, said sleeve 11 forming the part of the roller located in the holder hinged around the axis 4 and mounted in the fixed bearing 5. On this sleeve 11 is keyed a wheel

  toothed 12 which meshes with a complementary wheel 13

4.

  on the output shaft of a geared motor unit 14.

  These toothed wheels 12 and 13 have a denim module

  sufficient to allow the mandrel to be raised

  more or less deep groove of the teeth between them.

  On the cross table of the frame 1 is fixed a slide 15 which extends over the entire width of said frame, and

  in which is slid upwards a chew

  said fixed 16 movable vertically and resting horizon-

  at the end, on two lower adjustment screws 17 and 18 perpendicularly crossing the table of the frame 1 and screwed

in this one.

  The fixed jaw 16 extends under the forming shaft 9 and in line with it while above said mandrel, and in a position diametrically opposed to that of the fixed jaw, extends a jaw superior mobile

  19 slide at both ends in sliding

  vertical supports 20 and 21 supported above the mandrel 9 by lever-shaped supports 22 articulated around horizontal axes 23 at the upper end of the uprights

  vertical 24 fixed on the table of the frame 1.

  The ends of the levers 22 opposed to the sliding

  with respect to the hinge pins 23 are articu-

  by means of horizontal axes 25 and clevises 26 to the ex-

  upper end of cylinders rods 27 and 28 for actuating the movable jaw vertically oriented and hinged to

  their base on the chassis 1. The movable jaw 19 is sup-

  carried at its two ends, in line with the mandrel 9 by vertical screws for adjusting the spacing of the jaws 29 and which cross the bottom of the slides 20 and 21 and are

screwed into them.

  On their side directed towards the forming mandrel 9, the two fixed and movable jaws 19 both comprise a longitudinal groove V respectively 31 and 32, whose inclined flanks extend parallel to the mandrel

that they envelop.

  Preferably, the opening angle of the V of the grooves

  of the two jaws is chosen between 90 and 1200 but, although

  heard, this choice is not imperative.

  The mandrel 9 comprises a tangential slot 33 (FIG 3) extending parallel to the axis of the mandrel on

  the entire length of the jaws 16 and 19.

  The pipe forming machine described above

  It operates as follows: the cylinder rod 7 is extended, which

  causes the raising of the arm 3 and consequently the lowering

  mandrel 2 in the V-groove of the fixed jaw

  16. The rods of cylinders 27 and 28 are then simultaneously

  element in extension so as to tilt the levers 22 about their horizontal axes 23 and then bring the mobile upper jaw 19 of the forming mandrel 2 which

  the upper part is lodged inside the rai-

  V-shape of said movable jaw, an interstice correspon-

  to the thickness of the rolling sheet being left between the mandrel and the two jaws 16 and 19. The bearing is closed

  and the machine is then ready for operation.

  A sheet previously cut to the dimensions of

  rolling pipe is presented along the mandrel 2 of the

  China and the front edge of said sheet is engaged in the

  tangential slot 33 of the broadband. The latter is then

  rotated by the geared motor 14 via the

  the area of the two toothed wheels in engagement 12 and 13, and the sleeve It driving with it the sheet which is forced to pass between said mandrel and the flanks of the V-shaped grooves 31 and 32 of the two jaws 16 and 19, The rolling of the sheet between the mandrel 2 and the flanks of the V-shaped grooves of the two jaws 16 and 19 ensures the bending and winding of said sheet around the mandrel. After two rounds of the latter, the pipe

  is formed with overlapping edges of the sheet and the rotation

  tion is interrupted while, simultaneously, the stems

  two actuating cylinders 27 and 28 are retracted,

  voicing the tilting backwards of the two levers 22 and

  uplift of the movable jaw 19.

  The bearing 10 is disassembled and opened to release the end of the mandrel 2 and the rod of the lateral cylinder 7 is retracted ensuring the lifting of the mandrel 2 above

  the fixed jaw 16 thus making it possible to release by

  lissement of the tube laterally on the side of the opposite machine

  to the geared motor 14 and to the cylinder 7.

6.

  The mandrel 2 being released from the tube which has just been

  formed, the cylinder rod 7 is again highlighted.

  sion, causing the mandrel 2 to be lowered inside the

  the V-groove of the fixed lower jaw 16, and the -â-

  mobile upper chime 19 comes again to style the par-

  upper part of the mandrel under the action of the two cylinders of

  actuating 27 and 28 which tilts forward the

  22. After the landing 10 is closed the machine is

  ready for operation and the forming cycle can be

to start.

  The fact for the sheet to be compressed along four parallel generatrices diametrically opposed two by two on the mandrel 2 allows to have substantially constant diameter tubes with very tight execution tolerances.

tight.

  The machine according to the invention makes it possible to

  tubes smaller than 100 mm in diameter with cylindrical

  perfect city and a higher production rate than

  obtained on currently known machines.

  The system according to the invention allows, in addition, to form with a same mandrel a large number of tube diameters. Of course, the scope of the invention is not limited to the single embodiment described above but it also covers any variant that would differ only

by details.

  Thus, for example, a machine for forming

  according to the invention may comprise a number of jaws su-

  less than two or the groove formed in the said

  choirs may have a section of different shape than a V

  such as for example a semicircular shape.

  In addition, the actuating cylinders of the opening

  re and closing the jaws as well as the actuator ser-

  to lift the mandrel 2 may be replaced by a

any equivalent equivalent.

7.

Claims (6)

  1. Machine for forming small diameter pipes in particular by rolling, said machine comprising a frame,   a form roller mounted rotatably on the frame and rotors   yens driving rotation of said roller, characterized in that it further comprises forming jaws (16, 19) disposed around the forming roll (2), and   means for moving said jaws relative to the wheel   the water. 2. Machine according to claim 1, characterized   in that it comprises two jaws diametrically oppo-   relative to the forming roll, in that one is fixedly mounted (16) and the other movable (19) to the frame (1), and in that the forming roll (2) is hinged to the   chassis so as to be able to move away from the fixed jaw.   3. Machine according to claim 2, characterized   in that the movable jaw is carried by at least one sup-   port (22? articulated on the frame and provided with means of action-   ment. 4. Machine according to claim 3, characterized in that the movable jaw supports are levers (22 carrying the jaw at one end and in that the   actuating means are cylinders (27, 28) connected to the other end of said levers.   5. Machine according to any one of the claims   1 to 4, characterized in that it includes   adjusting wedges (15, 21) in which the forming jaws (16, 19) are slidably mounted and in that jaw spacing adjusting means are associated said slides.   6. Machine according to any one of the claims   1 to 5, characterized in that each jaw of   mage has a V-shaped groove (31, 32) extending along   of the forming roll over substantially its entire length.