Classifications

• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
  • B23D—PLANING; SLOTTING; SHEARING; BROACHING; SAWING; FILING; SCRAPING; LIKE OPERATIONS FOR WORKING METAL BY REMOVING MATERIAL, NOT OTHERWISE PROVIDED FOR
  • B23D21/00—Machines or devices for shearing or cutting tubes
  • B23D21/04—Tube-severing machines with rotating tool-carrier

Definitions

• the present invention relates to a device for shaping tubes.
• tube cutters In the case of tube cutters, the tube is stationary while a peripheral cutting wheel is manually turned around the tube to cut the material.
• pipe cutters comprising a motorized tooth tool such as a milling cutter.
• a tube shaping device comprising radial clamping means and peripheral shaping means movable in rotation relative to the tube, characterized in that said shaping means comprise a rotary base provided a central orifice for the passage of the tube, the axis of which coincides with the axis of rotation and which carries at least one tool that can be moved radially to come into contact with said tube, a set of weights pivoting under the action of centrifugal force connected to a crankshaft transmitting the movement to said tool.
• the tool is fixed on a slide moving on the base and cooperating with an adjustable hydraulic damper integral with said base.
• said slide moves in a guided manner in a groove made on the base and is retained there by lateral flanges screwed onto the edges of said groove.
• said slide comprises a first U-shaped profiled part with radial displacement, in the center of which said tool is mounted with an adjustable position and a second profiled wing part, substantially perpendicular to the first part, with transverse displacement in contact with said damper.
• said set of flyweights comprises a driven flyweight secured to the crankshaft and at least one driving flyweight meshed with said driven flyweight; said driven and driving weights being connected by a spring allowing the return to the rest position.
• the set of weights consists of two weights meshed with one another by two pinions which are respectively integral with each of the weights and which are rotatably mounted around two pivot shafts.
• said crankshaft consists of a rotary disc provided with an eccentric shaft supporting a link connected to said tool.
• the set of weights is mounted on the rear face of said base while the crankshaft and the tool are mounted on the front face.
• said base is cylindrical and comprises a peripheral cavity in which are housed the weights formed of mass plates with curvilinear outer edges whose radius is substantially equal to that of the base.
• said base is integral with the hub of a pulley driven in rotation by a motor while said radial clamping means comprise at least one clamp intended to center and immobilize the tube, a member for adjusting the clamping force and a clamp locking member.
• said tool is a cutting blade whose end is intended to come into contact with the side wall of the tube in a direction determined according to the needs of the machining. It is also expected that said base is enclosed in a removable protective cover provided with a front opening aligned with the central orifice of the base, for the passage of a tube.
• said base consists of two articulated parts allowing its opening and its direct mounting on the tube in the machining position.
• the device of the invention makes it possible to shape, without deformation, tubes of long lengths and small diameters and / or small thicknesses made of materials traditionally difficult to machine such as stainless steels, titanium, zirconium alloys, materials plastics ...
• the device has a small footprint and is easily transportable. Its simplicity makes it possible to dismantle and control it easily and in particular remotely, for example by remote control.
• the penetration depth of the tool in the tube is adjustable by adjusting the position of the tool on the slide.
• the quality of the shaping obtained is excellent, without internal or external burrs and without contact with the product possibly contained inside the tube.
• FIG. 1 shows a perspective view of the device of the invention
• FIG. 2 shows a longitudinal sectional view of the device of the invention
• FIG. 3 shows a partial front view of the device of the invention.
• FIG. 4 shows a partial view of the rear face of the base of the device of the invention.
• the device shown in Figures 1 and 2 comprises radial clamping means and peripheral shaping means of a tube T (not shown in Figure 2).
• the radial clamping means comprise at least one rectified clamp P of the "SCHAUBLEN" type (trademark) intended to center and immobilize the tube T.
• the clamp P is associated with a member R for adjusting the clamping force and a locking member V.
• the adjustment member R consists of two threaded rings RI, R2 screwed onto a hollow shaft A, the front end of which is integral with the clamp P.
• the rotation of the rings RI, R2 causes the translation from the shaft A in the direction F towards the clamp P.
• the clamp P has a front end E with frustoconical profile housed in support in a sleeve M with corresponding profile, the advance of the shaft A results in an opening of the clamp P while the reverse movement of the shaft A closes the clamp P.
• the locking member V has a lever L of the "NORELEM” (trade mark) type with two positions.
• the set of radial clamping means is fixed on a horizontal sole S and on a vertical frame B.
• the peripheral shaping means are movable in rotation relative to the fixed tube T. They comprise a rotary base 1 provided with a central orifice 10 for the passage of the tube T, the axis of which coincides with the axis of rotation.
• the base 1 is mounted on the hub H of a pulley D coaxially surrounding the clamp P by means of bearings K.
• the pulley D and therefore the base 1 are rotated by one or more belts C for transmitting the mechanical energy produced by a motor G.
• a safety system with electrical contactors (not shown) makes it possible to prohibit the rotation of the base 1 if the clamp P is not locked in the clamping position of the tube T.
• base 1 is optionally enclosed in a removable protective cover, provided with a front opening aligned with the central orifice 10 of the base.
• the rotary base 1 carries at least one shaping tool 2 which can be moved radially to come into contact with the tube T under the action of centrifugal force.
• the centrifugal force is actually reflected in the device by the pivoting of a set of weights 3, mounted on the rotary base 1 and connected to a crankshaft 8 transmitting mechanical energy to the tool 2.
• the rotary base 1 is made in one piece but it is possible, in an embodiment not shown, to design the base 1 in two articulated semi-cylindrical parts allowing its opening according to a diameter and its mounting on a fixed tube, directly in the machining position.
• the tool 2 is fixed on a slide 5 cooperating with an adjustable hydraulic damper 7, integral with the base 1.
• the slide 5 moves in translation in a guided manner in a groove 11 formed on the base 1 while being retained there by lateral flanges 6 screwed onto the edges of said groove.
• the slide 5 comprises a first part 51 profiled in U, with radial displacement in the center of which is mounted, with an adjustable position, the tool 2 and a second part 52, profiled in wing, with transverse displacement in contact with the damper 7.
• the hydraulic damper 7 is housed in a straight duct 14 of the base 1. One end of the duct 14 opens into a groove 15 where the wing part 52 of the slide 5 moves in permanent contact with the shock absorber while its other end opens at the periphery of the base 1 through an orifice 14a receiving the adjustment member 70 of the shock absorber 7.
• the rear face lb of the base is equipped with a set of at least two weights 31.32 meshed with one another by two pinions 41.42 respectively secured to each of the weights 31.32.
• Each pinion 41,42 is rotatably mounted around a pivot shaft 30.
• the flyweight 31 forms a driven flyweight secured to the crankshaft 8 while the other flyweight 32 forms a power flyweight.
• the driven weights 31 and driving weights 32 are connected by a spring 40 ensuring, when the base 1 stops, that they return to the rest position.
• the weights 31, 32 are formed of plates whose mass and dimensions are predetermined as a function of the speed of rotation of the base 1.
• the crankshaft 8 provides the functional link between the driven counterweight 31 and the slide 5. It transmits the movement to the tool 2 by transforming the pivoting of the counterweights 31,32 and the rotation of the pinions 41,42 into a translational movement for the slide 5.
• the crankshaft 8 consists of a rotary disc 80 provided with an eccentric shaft 81 supporting a link 82 connected to the slide 5 itself carrying the tool 2.
• the disc 80 follows the movement of the pinion 41 of the driven flyweight 31 while being integral with the latter.
• An alternative embodiment may consist in making the pinion 41 and the disc 80 in one piece crossing the thickness of the base 1.
• the rotary base 1 is of generally cylindrical shape. Its rear face has a peripheral cavity 13, visible in FIG. 4, in which the weights 31, 32 are housed.
• the cavity 13 has a projecting circular rim 12 against which the curvilinear outer edges 31a, 32a, of the weights 31, 32 come into abutment during pivoting, which thus limits their travel.
• the radius of curvature of the outer edges 31.32a is substantially equal to the radius of the cylindrical base 1.
• the inner edge 31b, 32b of the weights 31.32 is also curvilinear to match the hub H of the pulley at rest. D.
• the damper 7 is in permanent contact with the wing 52 of the slide 5 even when the base 1 is immobilized so as to balance the support forces of the tool 2 on the tube T.
• the advance of the tool 2 is determined by the adjustment of the damper 7.
• the amplitude of the radial stroke of the slide 5 and therefore of the tool 2 is proportional to the amplitude of the pivoting of the counterweights 31, 32.
• the penetration depth of the tool 2 into the thickness of the tube T is adjusted beforehand by adjusting its position on the slide 5. To avoid unbalance phenomena and / or for reasons of quality of shaping, it is possible to equip the base 1 with several independent tools 2 working in offset transverse planes. Each tool then has its own set of weights and its crankshaft.
• the position of the tools on the base 1 must however be chosen so as not to unbalance it.
• the shaping tool represented in FIGS. 1 and 3 is a cutting tool produced in the form of a blade 2, the end 20 of which is intended to come into contact with the side wall of the tube T by rotation of the base 1
• the rotation is carried out at a constant and predetermined speed as a function of the characteristics of the tube T.
• the contact is preferably carried out in a direction determined with respect to the tangent to the tube as a function of the needs of the machining.
• the penetration depth of the blade 2 is adjusted beforehand by adjusting its position on the slide 5.
• the blade 2 In the case where the blade 2 is small, it is planned to mount it on the slider 5 by means of a block 21 provided with an adjusting screw 25 for connection with the slider 5 allowing the adjustment of the radial position of the blade 2.

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• Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• Sawing (AREA)

Applications Claiming Priority (2)

Publications (1)

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ID=9469694

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Cited By (4)

Families Citing this family (4)

Citations (4)

• 1994
  • 1994-12-12 FR FR9414909A patent/FR2727886A1/fr active Granted
• 1995
  • 1995-12-08 WO PCT/FR1995/001634 patent/WO1996018475A1/fr active Application Filing

Patent Citations (4)

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