ES2297508T3 - CUTTING PROCEDURE OF AN ONLINE TUBE AND CUTTING DEVICE USING THIS PROCEDURE. - Google Patents

Abstract

The present invention relates to a flexible cutting method and device for use with all tubes, including paperboard tubes, wherein a tube is simultaneously rotated and axially translated forwards to achieve, regardless of the tube thickness, a clean high-quality cut with no warping or burrs, without affecting production costs. Said cutting device (1) comprises two opposed rotary cutters (3) each mounted on a carriage (34) that is radially translatably movable in a direction perpendicular to the forward direction of the tube (2), and said carriages (34) are supported on an axially translatably movable holder (50) synchronised with the forward movement of the tube. The drive means (4) for driving the carriages (34) are arranged to move the cutters (3) intermittently towards the tube in cutting increments up to at least the entire thickness of the tube. Each cutting increment corresponds to a predetermined cutting depth so that the tube is cut in a series of steps. The cutting process may be followed by grooving or partial cutting steps performed using the same cutters (3) at a cutting depth smaller than the thickness of said tube (2). The present invention is useful for making tubes, particularly paperboard tubes, using a spiral winder or widening means.

Description

Cutting procedure of a tube in line and cutting device that uses said procedure.

The present invention relates to a procedure of cutting a tube in line, this being animated tube with a rotation movement on itself and with a forward movement by axial translation, using this procedure at least one blade arranged in a cutting plane default, this blade being animated simultaneously with a translation movement perpendicular to the advance of said tube in said cutting plane and with an axial translation movement synchronized with respect to the advance of said tube to cut at minus a portion of tube.

The present invention also relates to a cutting device that employs this method and which comprises at least one blade disposed in a predetermined cutting plane, first means of dragging the blade in radial translation perpendicular to the advance of said tube and a few seconds. moving means for moving the blade
axial translation valve synchronized with the advance of said tube to cut at least a portion of the tube.

Prior art

The tubes referred to in this invention are mainly cardboard tubes, of all dimensions, used as a rolling support for example in the fields of stationery, textiles, metallurgy, etc. These tubes are usually manufactured continuously in a machine of winding paper bands commonly referred to as spiral or boring machine. At the exit of this machine, it is placed a cutting device that allows cutting the tube obtained in portions of a predetermined length. Usually this cutting device comprises, as described in the publications DE-U-8805316 and US-A-4,591,405, two blades arranged on both sides of the aminated tube simultaneously with a forward movement in axial translation and with a movement of rotation on itself, said blades comprising a sheet of rotary cut They are mounted on animated cars with a radial forward and reverse translation, the assembly being mounted on a mobile support axially synchronized with the feed of the tube. Until today and whatever the thickness and hardness of the tube to be cut, the cut was made in a single pass or stage. That is to say that the blades moved at once on a stroke equal to the thickness of the tube to be sectioned in less than one tube rotation, that is approximately half a turn. This procedure is perfectly suitable for tubes Small thickness and allows to obtain a frank, clean cut without burr and in a plane well perpendicular to the axis of the tube. For the tubes having a thickness for example of 20 mm or more, this procedure does not allow to achieve the same benefits. In effect, when the blades sink into the thickness of the tube only once, the efforts generated by the resistance of the tube they tend to deform their cutting blade and divert their career generating a false cut of the tube. The cut is not clean, it presents some burrs and is deviated from the perpendicular plane of the tube shaft Also this false cut can generate locally deformations and / or crushing at the end of the tube with the risk of penalizing its future use. In addition, the efforts that the blades receive are transmitted to the cars, to the mobile support and the whole of the cutting device causing premature fatigue of its components. Therefore this cutting procedure is not satisfactory for some wall pipes thick or very hard.

There are other cutting devices but they are adapted to the cutting of an off-line tube, the tube being fixed axially and only animated with a rotation movement. These cutting devices, such as those described in the publications US-A-4,302,958, EP-A-0826467, US-A-4,794,684 and US-A-3,752,024 comprise two complementary cutting tools, one to make a roughing or thinning and the other to make the cut Properly said. Anyway, this type of device Cutting is not applicable at all to the cutting of an in-line tube.

Exhibition of the invention

The present invention intends to avoid these inconveniences by proposing a method of cutting an in-line tube that takes into account the thickness and hardness of the tube and which allows a frank quality cut, without incidents in the cost of production, as well as in the corresponding cutting device, reliable and that can suit any type of
tubes

With this aim, the invention relates to a cutting procedure of the type indicated in the preamble, characterized in that a number of cut levels are determined in function of at least one parameter that characterizes the tube to be cut selecting said parameter from the group comprising the minus its thickness, its hardness, its density, its diameter, and it conditions the control of advance of the cut of the blade in function of this parameter to perform the cutting of the tube in several stages successive moving the blade in the direction of the cut, until reach at least the total thickness of the tube, corresponding each cutting level at a predetermined depth of cut.

Two blades are preferably used arranged in the same cutting plane, as opposed to both sides of said tube, and the displacement of the blades in said cutting plane synchronously and oppositely. In this case Each level of cut is performed in a half turn of the tube.

At least two blades can be used arranged in different cutting planes to cut at least, in opposition to both sides of said tube, and the displacement of the blades in said cutting plane so synchronous and opposite. In this case, each level of cut is taken to out in half a turn of tube.

At least two blades of cutting arranged in different cutting planes to cut at minus two portions of tube. In this case, the displacement of each blade in its cutting plane so independently, synchronized or outdated, or in a way dependent.

You can also use at least two pairs of blades, each pair of blades being arranged in the same cutting plane, as opposed to both sides of the tube. In this case, the displacement of the blades of each pair in its plane is sent cutting synchronously and opposite.

Depending on the needs, you can move the blade according to a depth of cut less than the thickness of the tube to make a groove or a partial cut of the tube.

With this aim, the invention relates to a cutting device of the type indicated in the preamble, characterized in that it comprises conditioning means ready to send the first drag means in function of at least one parameter that characterizes said tube to be cut selected from the group comprising at least its thickness, its hardness, its density, its diameter so as to displace said blade in the direction of said tube discontinuously, by cutting levels until at least the total thickness of the tube is reached, corresponding each level of cut to a depth of cut predetermined so that the tube is cut in several successive stages, said means of conditioned to send said second drag means in function of at least the forward speed of said tube.

These conditioning means may comprise at least one programmable control unit and the drive means they can be selected from the group that includes at least the engines, the stepper motors, the servomotors, the elevators, cam systems.

In a preferred embodiment, this device comprises two blades arranged in the same plane of cut, as opposed to both sides of the tube, and the first and Second drag means are common to both blades.

Can comprise at least two blades arranged in different cutting planes to cut at least two portions of tube or at least two pairs of blades, being arranged the blades of each pair in the same cutting plane, in opposition to both sides of the tube.

In a preferred embodiment, each blade is mounted on a car coupled to the first means of drag, the whole is mounted on a mobile support to the Second drag means.

The first means of dragging can be coupled to the cars of the same pair of blades by a double worm-nut link, the opposite being the endless screw winding.

According to the embodiments, the one or more blades are coupled to rotating drive means.

Brief description of the figures

The present invention and its advantages will be set more clearly from the following description of an embodiment, given by way of non-limiting example, referring to the attached figures, in which:

- Figure 1 is a side view of a cutting device according to the invention.

- Figure 2 is an end view of the cutting device of figure 1, and

- Figures 3A-D are about views of the detail of the tube and the blades illustrating the cut progression

Illustrations of the invention and better way to carry it out

With reference to figures 1 and 2, the cutting device 1 according to the invention is generally placed at the output of an in-line pipe making machine by wrapping of paper bands, commonly referred to as spiral or mandrinadora, and allows the cut of the tube 2 obtained in portions of a predetermined length. It also allows the grooving or partial cutting of the tube in addition to the cut according to needs This cutting device 1 can also be fed with tubes for cutting or grooving out of any line of manufacturing or by any other machine.

This cutting device 1 is powered by the 2 animated tube simultaneously with a rotation movement over itself and with an advance movement by axial translation, being generated these movements in a general way by the machine tube manufacturing The tube 2 is guided in translation in the cutting device 1 to the cutting area. After the zone cutting, the portions of tube 2 are evacuated from the device cut 1 by any known evacuation means (no represented), such as a conveyor belt, a gutter, etc. towards a storage area (not shown) or palletizing. He guided tube 2 in translation is secured by guides external: high 20, low 21 and lateral 22, adjustable in position depending on the diameter of tube 2 by any means known. This guidance can still be completed through a inner mandrel (not shown). In figure 2, tube 2 is represented by the smallest diameter and the largest diameter admissible on this cutting device 1.

The forward movement of the tube 2 follows an axis that is confused with the median plane A of the
cut 1.

On both sides of this medium plane, they are arranged two blades 3 aligned in the same cutting plane B and that define the cutting area. Each blade 3 is constituted by a circular cutting blade 30, rotated in rotation by an engine 31 and a transmission by sprockets 32 and chain 33. They are also possible other means of drag and can be coupled directly to circular sheet 30 or by other means of transmission. In other embodiments not shown, the cutting blades are not motorized and are dragged in rotation only by the rotation of the tube 2. The two blades 3 are diametrically opposed, one serves as a counter-support to the other, apara prevent tube 2 from leaving its axis. If only one is planned blade 3, then a back support should be provided on the part opposite for example by a rotating roller. This device of cutting 1 may also comprise several blades 3 or pairs of blades arranged in different cutting planes for cutting simultaneously or not several portions of tube 2, but also mark or groove said tube 2.

Each blade 3 is mounted on a carriage 34 mobile in translation in said cutting plane B for a few first drag means 4. In the example shown, these first drive means 4 comprise a motor 40 coupled to a screw endless 41, for example with ball bearing, by means of a transmission by pulleys 42 and belt 43, engaging the screw without end 41 a nut 44 in solidarity with cart 34. These first drag means 4 are common to the two blades 3 since they drag a double worm 41 of inverted winding. Each cart 34 is guided in translation by a bearing path 35 provided on both sides of the worm 41, and between the carriage 34 and a support 50. Obviously other means of drag, transmission and guidance. In figure 2, the blade 3 on the left it is represented in two positions that correspond respectively to the two extreme sizes of tube 2, the blade 3 on the right is only partially represented.

The trolleys 34 are mounted on a support 50 mobile in axial translation for a few second spring 5 synchronized on the advance of tube 2. These second means of drive 5 comprises a motor 51 provided with a motor pinion 52 which gear a toothed belt 53 integral with said support 50. This timing belt 53 extends parallel to the median plane A and it forms a closed loop that circulates between a receiver pinion 54 and a motor pinion 52. Bracket 50 is guided in translation by two rails 55 parallel solidarity with a chassis 6 and stopped in translation by two flexible stops 56 provided on this chassis. Evidently other means of drag, transmission and of guided. In Figure 1, the extreme positions of the support 50 they are represented on the left with a very wide stroke and on the right partially and with a thin line.

The chassis 6 is made for example with a assembly of machined and sheet metal profiles and covers in particular engines 40 and 51 of the first and second means of drag 4, 5. This chassis 6 is covered by a hood 7, made for example in an assembly of plates and plates translucent, and covers in particular the tube 2, the blades 3, the trolleys 34 and support 50.

This cutting device 1 also includes a programmable control unit (not shown) that allows condition the different engines 31, 40 and 51 depending on parameters such as diameter, thickness and speed of circulation of tube 2, these motors being for example about servomotors

Industrial application

This cutting device 1 allows a large adaptability and great flexibility of use. Not only can be used to perform only cutting operations but also a combined operations partial cutting, shaving and cut by the same blade 3 or the same pair of blades 3. If the cutting device 1 is equipped with several blades 3 or pairs of blades arranged in different cutting planes, the stroke of each blade 3 or pair of blades 3 can be programmed in the control unit so as to adapt to the operation perform.

It clearly shows that this 1 cutting device can be suitable for a wide range of dimensions of tube 2 and can make quality cuts whatever the thickness of the tube 2. For small tubes 2 thickness, for example less than 20 mm, the cut is made of known form in a single stage. The blades 3 are displaced in radial translation in its cutting plane in the direction of tube 2 over a cutting stroke equal to at least the thickness of the tube 2 a cut. Thus the portion is cut in less than one turn of the tube 2, it is say about half a turn.

For tubes 2 of greater thickness E, for example greater than or equal to 20 mm and / or having hardnesses or high densities, the cut is made in several stages successive as illustrated in Figures 3A to 3D. In Figure 3A, the blades 3 are close to the tube 2. In figure 3B, the blades 3 are displaced from a first cutting stroke C1 less than the thickness E of the tube 2, such that after a first half turn, tube 2 is partially cut with a depth P1. In Figure 3C, the blades 3 are displaced from a second C2 cutting stroke, still being less than the thickness E of tube 2 the sum of runs C1 and C2, such that after of a second half turn, that is a complete turn, tube 2 is partially cut with a depth P2. In the 3D figure, the Blades 3 are displaced from a third C3 cutting stroke, the sum of runs C1 to C3 being now equal to the thickness of the tube 2, such that after a third half turn, that is a turn and a half, the tube 2 is cut completely over all its thickness E. The next stage is the displacement of the blades 3 in the reverse direction and in a single stage to start from Again a cutting cycle. Obviously these different stages of cutting are performed simultaneously with the axial feed of tube 2 thanks to a few second drag means 5 that move the support 50 carrying said blades 3. Thus a cut of tube 2 per level, each level corresponding approximately to a half turn of tube 2. The number of cutting levels can vary depending on the parameters of tube 2 that determine its ability to be cut, such as its thickness, its density, its hardness, its matter, etc. This level cutting procedure It has the advantage of making a quality cut without crushing or warp tube 2, without burrs, or false cut and without formation or deviation of the cutting blades 30. Obviously if the cutting device only comprises a blade 3, each level of The cut will be made on at least one complete turn of the tube 2.

The present invention is not limited to described embodiment example but extends to any obvious modification and variant for a person skilled in the art remaining within the scope of protection defined in the attached claims.

Claims (13)

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1. Procedure of cutting a tube (2) in line, this tube being simultaneously animated with a rotational movement on itself and with an advance movement by axial translation, using this procedure at least one blade (3) arranged in a predetermined cutting plane (B), this blade (3) being animated simultaneously with a translation perpendicular to the advance of said tube (2) in said cutting plane (B) and with an axial translation synchronized with the advance of said tube (2) ) to cut at least a portion of the tube, characterized in that the number of cutting levels is determined based on at least one parameter that characterizes the tube (2) to be selected selected from the group comprising at least its thickness, its hardness , its density, its diameter, and because the cutting advance control of the blade (3) is conditioned according to this parameter to perform the cutting of the tube (2) in several successive stages by moving the blade (3) in dir ection to the tube, discontinuously, by cutting levels, until at least the total thickness (E) of the tube (2) is reached, each cutting level corresponding to a predetermined cutting depth (P1, P2, P3). 2. Method according to claim 1, characterized in that two blades (3) arranged in the same cutting plane (B) are used, as opposed to both sides of said tube (2), because the displacement of blades (3) is commanded. ) in said cutting plane in a synchronous and opposite manner and because each cutting level is performed on at least one half turn of the tube (2). 3. Method according to claim 1, characterized in that at least two blades (3) arranged in different cutting planes (B) are used to cut at least two tube portions. Method according to claim 1, characterized in that at least two pairs of blades (3) are used, the blades (3) of each pair being arranged in the same cutting plane (B), as opposed to both sides of said tube (2), and because the displacement of the blades (3) of each pair in said cutting plane (B) is sent synchronously and oppositely. 5. Method according to claim 1, characterized in that the blade (3) is moved along a depth of cut less than the thickness (E) of the tube (2) to make a groove or a partial cut of said tube. 6. Cutting device (1) of a tube (2) in line, this tube being animated simultaneously with a rotational movement on itself and with an advance movement by axial translation, this device comprising at least one blade (3) arranged in a predetermined cutting plane (B), first drive means (4) of the blade (3) in radial translation perpendicular to the advance of said tube (2) and second drive means (5) of the blade ( 3) in axial translation synchronized with the advance of said tube (2) to cut at least a portion of tube, characterized in that it comprises conditioning means arranged to send said first drive means (4) as a function of at least one parameter that characterizes said tube (2) to be cut selected from the group comprising at least its thickness, its hardness, its density, its diameter such that it moves said blade (3) in the direction of said tube (2), discontinuously, by level The cutting lengths until at least the total thickness (E) of the tube (2) is reached, each cutting level corresponding to a predetermined depth of cut (P1, P2, P3) so that the tube (2) is cut in several stages successive, said conditioning means being also arranged to send said second drive means (5) as a function of at least the forward speed of said tube (2). Device according to claim 6, characterized in that the conditioning means comprise at least one programmable control unit and the drive means (4, 5) are selected from the group comprising at least the motors, the stepper motors , servomotors (40, 51), elevators, cam systems. Device according to claim 6, characterized in that it comprises two blades (3) arranged in the same cutting plane (B), as opposed to both sides of said tube (2), and because the first and second means of dragging (4 , 5) are common to the two blades (3). Device according to claim 6, characterized in that it comprises at least two blades (3) arranged in different cutting planes (B) for cutting at least two tube portions (2). Device according to claim 9, characterized in that it comprises at least two pairs of blades (3), the blades (3) of each pair being arranged in the same cutting plane (B), as opposed to both sides of said tube ( 2). Device according to one of claims 8 to 10, characterized in that each blade (3) is mounted on a carriage (34) coupled to said first drive means (4), the assembly being mounted on a coupled mobile support (50) to said second drag means (5). 12. Device according to claim 11, characterized in that the first drive means (4) are coupled to carriages (34) of the same pair of blades (3) by means of a double nut link (44) - endless screw (41) , the winding of the endless screws being opposite (41). 13. Device according to claim 6, characterized in that said blade (3) is coupled to rotating drive means (31).