DE102017110923B3 - Device for cutting a pipe; Method for cutting a pipe - Google Patents

Abstract

Device (1) for severing a pipe (2) by shearing along a parting line (20) running transversely to a longitudinal axis (26) of the pipe (2), comprising a feed unit for feeding the pipe (2) to be cut, characterized in that the feed unit has a first feed unit (3) and at least one second feed unit (4), wherein the feed units (3, 4) are each connected to separate threaded spindle units (17, 18).

Description

State of the art

The invention relates to a device for cutting a pipe, according to the preamble of claim 1, and a method for cutting a pipe, according to the preamble of claim 14.

Pipes, in particular metallic pipes or pipes made of plastic, which can be thick or thin-walled, are today separated using different technologies. As the main method (especially for thick-walled pipes with a wall thickness> 4mm) sawing technology is used. The disadvantage of sawing lies in the long cycle time, the material waste and the occurrence of chips.

For this reason, chip-free technologies have been developed, in which the pipe is separated without shearing in a shearing process. The problems encountered are usually high deformations of the interfaces (especially in thin-walled tubes).

To overcome this disadvantage, the separation technology has been developed and a "divisible mandrel", which is to avoid deformation at a cutting plane of the tube, developed. The "divisible mandrel", for example, in the patent US Pat. No. 6,698,322 B2 is described, has a parting plane, which is positioned exactly in the cutting plane, whereby the tube can be supported from the inside and thus a collapse during separation can be largely avoided. To perform the separation process, two annular "jaws" are moved relative to each other, thereby shearing the material through these cutting / shear matrices. As a rule, a cutting die (jaws) is fixed while the cutting movement is carried out with the second die. In addition to devices in which the drive for this movable die by a relative movement triggering shock (pulse) is performed, devices are also known in which the relative movement is performed by hydraulic cylinders.

So in the patent DE 10 2010 061 191 B4 discloses a method of severing a pipe into two pipe parts by shearing along a parting line transverse to a longitudinal extent of the pipe, wherein two mandrel parts are inserted into the pipe and linearly moved two shear jaws, a first shear and a second shear, oppositely directed along the parting plane are further, wherein the unconnected mandrel parts with respect to the parting plane are arranged in the tube so that after cutting in each of the tube parts, a mandrel part remains, wherein two first shear jaws are provided, which are movable relative to the second shear gap, wherein in each method the first Scherbacken is moved in alignment with the second Scherbacke. The disadvantage here is that the pipe material is separated by the linear movement of the shears each other in the wall only in the cutting plane "optimal". In other areas, especially in the transverse to the cutting plane areas, the pipe material is "demolished".

To overcome this disadvantage, a method has been developed in which a cutting die is fixed while the second die performs a biaxial movement. The movements take place one after the other and are each driven by a hydraulic cylinder. However, the cutting results could also be improved only insignificantly.

In the published patent application DE 37 07 405 A1 describes a device for cutting a pipe section of a pipe without cutting, in which the shearing movement takes place with a rotary knife, which is subjected to an eccentric movement, in particular a full revolution by means of a drive. The advantage here is that as a result of the eccentric movement, the cutting direction changes constantly, so that no disadvantaged upsetting areas can form on the tube, which are less sheared than compressed and lead to an unclean cut. Although a tube severed with this device is without length loss, and the cut surface is without a burr, so that a further processing without post-processing is possible, but for the separation process, a large amount of time required.

In addition, the known from the prior art devices have the disadvantage that it comes in equipping the device with the pipes to be cut at considerable loss times in which no pipe is cut, whereby the productivity is adversely affected.

The invention is therefore an object of the invention to provide a device for severing a pipe by shearing along a transverse to a longitudinal axis of the pipe separating plane and a method for cutting a pipe through which the disadvantages of the prior art, to which also the patent US 4 794 834 A , the patent application JP H10-328 767 A and the patent DE 696 07 314 T2 belong, be overcome.

The invention and its advantages

The inventive device for severing a pipe by shearing along a transverse to a longitudinal axis of the pipe dividing plane, with the features of claim 1, and the inventive method for cutting a pipe, with the features of claim 14, have the advantage that a Feed unit of the device according to the invention a first feed unit (eg clamping module) and at least one second feed unit (eg clamping module), whereby the loss times in the supply of the pipes to be cut drastically reduced.

According to an advantageous embodiment of the device according to the invention, the device comprises a of the tube having a wall thickness, enforceable and drivable by at least one drive unit shaving unit, which faces a first Schneidmatritze which faces the feed unit, and a second Schneidmatritze which faces away from the feed unit in which the separating process is carried out by an eccentric relative movement of the first cutting die and the second cutting die, and / or the apparatus has a mandrel for insertion into the pipe, the mandrel having a mandrel with a stabilizer disposed thereon the stabilizer has a parting plane which is positioned or positionable in the dividing plane of the pipe, whereby the stabilizer on the part of the second cutting die is a stabilizer part connected to the mandrel bar and on the part of the first cutting die a flexible stabilizer part a ufweist, and / or the mandrel and / or the stabilizer is connected to the shearing unit. Thereby, the mandrel has a stabilizer, which has a stabilizer part connected to a mandrel and a flexible stabilizer part, wherein the stabilizer parts separated by a parting plane are movably but preferably connected together, an angular offset of the mandrel is avoided when shearing the tube small kerf is feasible. This leads to the fact that the cut surface is as free of burrs and smooth as possible, ie has a high surface quality and a low roughness. Furthermore, it is advantageous that the separation process takes place without chips and can be carried out in a very short time (<0.3 seconds / cut).

According to a related advantageous embodiment of the device according to the invention, the mandrel bar and / or arranged on the mandrel bar stabilizer are connected to the second Schneidmatritze.

According to an additional advantageous embodiment of the device according to the invention, the second Schneidmatritze is a movable to the first Schneidmatritze in an eccentric relative movement Schneidmatritze.

According to an additional advantageous embodiment of the device according to the invention, the first Schneidmatritze a stationary Schneidmatritze or the first Schneidmatritze and the second Schneidmatritze to the respective other Schneidmatritze in an eccentric relative movement movable Schneidmatritzen.

According to an additional advantageous embodiment of the device according to the invention, the eccentricity of the eccentric relative movement is equal to or greater than the wall thickness of the tube.

According to an additional advantageous embodiment of the device according to the invention, the separation process is completed at a rotation angle of about 180 °, which is produced by the rotational movement of the eccentric relative movement.

According to an additional advantageous embodiment of the device according to the invention, the mandrel is connected by means of a gripping and / or fixing unit with the second Schneidmatritze.

According to an additional advantageous embodiment of the device according to the invention, the device for removing a sheared pipe part on a driven transport module.

According to a related advantageous embodiment of the device according to the invention, the removal module is connected to the shearing unit and / or the mandrel.

According to an additional advantageous embodiment of the device according to the invention, the removal module is connected to the second Schneidmatritze.

According to an additional advantageous embodiment of the device according to the invention, the removal module is a disposal belt or brush belt.

According to an additional advantageous embodiment of the device according to the invention, at least one feed unit is movable in the direction of the longitudinal axis of the tube towards the shearing unit or away from the shearing unit.

According to an advantageous embodiment of the method according to the invention for severing a tube by shearing along a transverse to a longitudinal axis of the tube Parting plane with a device for cutting through a tube, which has a feed unit for feeding the to be cut, a wall thickness having tube, wherein the feed unit comprises two feed units, wherein the feed unit for continuously feeding the device comprises a first feed unit and at least one second feed unit has the apparatus comprises a shearing unit, which can be driven by at least one drive unit and has a longitudinal axis, and a second cutting mat having a longitudinal axis, the first cutting mat facing the supply unit and Facing away facing supply unit, wherein by an eccentric relative movement of the first Schneidmatritze and the second Schneidmatritze each other, the separation process is performed, and / or the device a a mandrel for insertion into the tube, wherein the mandrel has a mandrel having a longitudinal axis with a stabilizer disposed thereon and the mandrel is moved relative to each other in performing the separation process by the eccentric relative movement of the first cutting mat and the second cutting mat, and / or a tube part facing the feed unit, which has the longitudinal axis of the tube, and a tube part which faces away from the feed unit and has a longitudinal axis, is formed by the separation process from the tube, wherein before the separation process the longitudinal axis of the tube, the longitudinal axis of the mandrel bar, the longitudinal axis of the first cutting die and the longitudinal axis of the second cutting die are aligned coaxially with each other, the initial coaxial alignment being due to the movement of the mandrel caused by the severing process to coaxial alignment of the longitudinal axis of the tubular member, the longitudinal axis of the mandrel and the length the longitudinal axis of the tubular member, the longitudinal axis of the mandrel rod and the longitudinal axis of the second Schneidmatritze during the separation process always parallel to the longitudinal axis of the Supply unit facing tube part and the longitudinal axis of the first Schneidmatritze remain aligned.

According to an additional advantageous embodiment of the method according to the invention, the stabilizer on a parting plane which is positioned or positioned in the parting plane of the tube, whereby the stabilizer part of the first Schneidmatritze a connected to the mandrel bar stabilizer part and part of the second Schneidmatritze has a flexible stabilizer part, so in that, after severing the pipe through which two pipe parts are formed, the stabilizer part connected to the mandrel bar is located in one pipe part and the flexible stabilizer part in the other pipe part.

According to an additional advantageous embodiment of the method according to the invention, the mandrel is connected to a cutting mattress that moves eccentrically relative to the other cutting mat.

According to an additional advantageous embodiment of the method according to the invention is at the end of the separation process at a by the eccentric relative movement of the first Schneidmatritze and the second Schneidmatritze resulting rotational angle 180 °.

According to an additional advantageous embodiment of the method according to the invention, the tube is severed during the separation process by the mandrel from the inside outwards and by the shearing unit from outside to inside.

According to an additional advantageous embodiment of the method according to the invention, a shearing operation carried out during the separation process is a pulling, shearing operation. Due to the pulling shear, the entire cross section of the pipe is not subjected to the shearing at once.

According to an additional advantageous embodiment of the method according to the invention, a device according to one of claims 1 to 13, is used as a device for cutting through a pipe.

Further advantages and advantageous embodiment of the invention are the following description, the drawing and the claims removed.

list of figures

• 1 eine perspektivische Ansicht der erfindungsgemäßen Vorrichtung,
• 2 eine andere perspektivische Ansicht der erfindungsgemäßen Vorrichtung, gemäß 1,
• 3 eine Detailansicht der erfindungsgemäßen Vorrichtung, gemäß 1,
• 4 eine andere Detailansicht der erfindungsgemäßen Vorrichtung, gemäß 1,
• 5 eine andere Detailansicht der erfindungsgemäßen Vorrichtung, gemäß 1,
• 6 eine andere Detailansicht der erfindungsgemäßen Vorrichtung, gemäß 1,
• 7 eine andere Detailansicht der erfindungsgemäßen Vorrichtung, gemäß 1,
• 8 eine andere Detailansicht der erfindungsgemäßen Vorrichtung, gemäß 1,
• 9 eine perspektivische Ansicht einer Abschereinheit der erfindungsgemäßen Vorrichtung, gemäß 1,
• 10 eine Seitenansicht der Abschereinheit, gemäß 9,
• 11 eine Seitenansicht der Abschereinheit, gemäß 9,
• 12 eine Schnittansicht der Abschereinheit, gemäß 9,
• 13 eine Schnittansicht eines Dorns, der eine Dornstange und einen Stabilsator aufweist, gemäß 12,
• 14 eine schematische Aufsicht (links in der Figur) und eine schematische Schnittansicht (rechts in der Figur) auf eine Abschereinheit bei einem Umdrehungswinkel von 0°,
• 15 eine schematische Aufsicht (links in der Figur) und eine schematische Schnittansicht (rechts in der Figur) auf eine Abschereinheit bei einem Umdrehungswinkel von 30°,
• 16 eine schematische Aufsicht (links in der Figur) und eine schematische Schnittansicht (rechts in der Figur) auf eine Abschereinheit bei einem Umdrehungswinkel von 60°,
• 17 eine schematische Aufsicht (links in der Figur) und eine schematische Schnittansicht (rechts in der Figur) auf eine Abschereinheit bei einem Umdrehungswinkel von 90°,
• 18 eine schematische Aufsicht (links in der Figur) und eine schematische Schnittansicht (rechts in der Figur) auf eine Abschereinheit bei einem Umdrehungswinkel von 120°,
• 19 eine schematische Aufsicht (links in der Figur) und eine schematische Schnittansicht (rechts in der Figur) auf eine Abschereinheit bei einem Umdrehungswinkel von 150°,
• 20 eine schematische Aufsicht (links in der Figur) und eine schematische Schnittansicht (rechts in der Figur) auf eine Abschereinheit bei einem Umdrehungswinkel von 180°,
• 21 eine schematische Darstellung des Trennvorgangs bei einem Umdrehungswinkel von 0°,
• 22 eine schematische Darstellung des Trennvorgangs bei einem Umdrehungswinkel von 30°,
• 23 eine schematische Darstellung des Trennvorgangs bei einem Umdrehungswinkel von 60°,
• 24 eine schematische Darstellung des Trennvorgangs bei einem Umdrehungswinkel von 90°,
• 25 eine schematische Darstellung des Trennvorgangs bei einem Umdrehungswinkel von 120°,
• 26 eine schematische Darstellung des Trennvorgangs bei einem Umdrehungswinkel von 150° und
• 27 eine schematische Darstellung des Trennvorgangs bei einem Umdrehungswinkel von 180°.

A preferred embodiment of the subject invention is shown in the drawing and will be explained in more detail below. Show it

• 1 a perspective view of the device according to the invention,
• 2 another perspective view of the device according to the invention, according to 1 .
• 3 a detailed view of the device according to the invention, according to 1 .
• 4 another detail view of the device according to the invention, according to 1 .
• 5 another detail view of the device according to the invention, according to 1 .
• 6 another detail view of the device according to the invention, according to 1 .
• 7 another detail view of the device according to the invention, according to 1 .
• 8th another detail view of the device according to the invention, according to 1 .
• 9 a perspective view of a shearing unit of the device according to the invention, according to 1 .
• 10 a side view of the shearing unit, according to 9 .
• 11 a side view of the shearing unit, according to 9 .
• 12 a sectional view of the shearing unit, according to 9 .
• 13 a sectional view of a mandrel having a mandrel rod and a stabilizer according to 12 .
• 14 1 is a schematic plan view (on the left in the figure) and a schematic sectional view (on the right in the figure) of a shearing unit at a rotation angle of 0 °,
• 15 5 is a schematic plan view (on the left in the figure) and a schematic sectional view (on the right in the figure) of a shearing unit at a rotation angle of 30 °,
• 16 1 is a schematic plan view (on the left in the figure) and a schematic sectional view (on the right in the figure) of a shearing unit at a rotation angle of 60 °,
• 17 a schematic plan view (left in the figure) and a schematic sectional view (right in the figure) of a shearing unit at a rotation angle of 90 °,
• 18 1 is a schematic plan view (on the left in the figure) and a schematic sectional view (on the right in the figure) of a shearing unit at a rotation angle of 120 °,
• 19 a schematic plan view (left in the figure) and a schematic sectional view (right in the figure) of a shearing unit at a rotation angle of 150 °,
• 20 1 is a schematic plan view (on the left in the figure) and a schematic sectional view (on the right in the figure) of a shearing unit at a rotation angle of 180 °,
• 21 a schematic representation of the separation process at a rotation angle of 0 °,
• 22 a schematic representation of the separation process at a rotation angle of 30 °,
• 23 a schematic representation of the separation process at a rotation angle of 60 °,
• 24 a schematic representation of the separation process at a rotation angle of 90 °,
• 25 a schematic representation of the separation process at a rotation angle of 120 °,
• 26 a schematic representation of the separation process at a rotation angle of 150 ° and
• 27 a schematic representation of the separation process at a rotation angle of 180 °.

Description of the embodiment

The 1 and 2 show perspective views of the device according to the invention 1 for cutting a pipe 2 by shearing along a transverse to a longitudinal axis of the tube 2 extending parting plane. The device according to the invention 1 has a feed unit, which consists of a first feed unit 3 , a second feed unit 4 and a gripper 5 exists, one of the pipe 2 enforceable and by a drive unit 6 drivable shearing unit 7 at the gripper 5 is fixed and a first Schneidmatritze, which faces the feed unit, and a second Schneidmatritze 8th , which faces away from the feed unit, wherein, by an eccentric relative movement of the first Schneidmittritze and the second Schneidmatritze 8th to each other the separation process, in which a part to be separated from the tube in the second cutting die 8th and a supplied pipe part is fixed in the first cutting die, and one into the pipe 2 insertable a mandrel bar 9 having a longitudinal axis, comprising mandrel 10 , on. The thorn 10 has a stabilizer, wherein the stabilizer has a parting plane, in the parting plane of the tube 2 positioned or positionable, whereby the stabilizer on the part of the second Schneidmittritze 8th a stabilizer part connected to the mandrel bar 9 and a flexible stabilizer part from the first cutting die.

The mandrel 9 of the thorn 10 is by means of a gripping and / or fixing unit 11 , the cylinders 12 having, with the second Schneidmatritze 8th connected, creating the gripping and / or fixing unit 11 and the mandrel located thereon 10 together with the second Schneidmatritze 8th the eccentric relative movement, which is most easily realized by the fact that the second cutting die 8th performs the eccentric movement, while the first cutting die remains stationary, can perform. This has the consequence that the longitudinal axis of the mandrel 9 at a movement of the mandrel caused by the separation process 10 a parallel orientation of the longitudinal axis of the mandrel 9 to the longitudinal axis of the tube 2 , which is fixed in the first cutting die, maintains. Because the thorn 10 also performs the eccentric rotational movement by its storage, an angular offset, which would lead to an undesirable increase in the kerf, avoided during separation. As a result, when shearing a pipe part, a small cutting gap is possible, whereby a high surface quality is achieved.

At the gripping and / or fixing unit 11 a removal module is arranged that for the removal of a sheared pipe part, a brush belt 13 and a switch 14 through which a sheared off pipe part optionally into a desired lattice box 15 or 16 can be carried. This makes it possible, for example, gates and end pieces in the grid box 15 and properly cut pipe parts in the grid box 16 to transport.

3 shows a detailed view of the device according to the invention 1 , according to 1 , The gripping and / or fixing unit 11 preferably has two pairs of cylinders, each with two cylinders 12 namely one of the shearing unit 7 facing cylinder pair and one of the shearing unit 7 facing cylinder pair, on. By applying a pair of cylinders, the mandrel bar 9 fixed so that these with the gripping and / or fixing unit 11 connected is. After shearing a pipe part, the remaining pipe part, in which the flexible stabilizer part is located, by means of the feed unit via the with the mandrel bar 9 pushed stabilizer connected part, wherein the length of the feed corresponds to the length of the subsequently abzuscherenden pipe part. Through or subsequent feeds a sheared off pipe part on the mandrel 9 pushed to a removal module, which in the embodiment shown, the brush belt 13 is. The brush band 13 captures a sheared pipe part and carries it along the mandrel bar 9 to the switch 14 , by depending on the position of the switch 14 For example, a sorting of the sheared pipe parts is made possible by length. Once a sheared pipe part on the way towards the switch 14 that of the shearing unit 7 reached facing cylinder pair, this solves the fixation of the mandrel 9 to clear the way for the sheared pipe part. While fixing the mandrel 9 through the shearing unit 7 facing cylinder pair is loosened and the sheared pipe part of the the shearing unit 7 facing cylinder pair is transported past, the fixation of the mandrel 9 by the shearing unit 7 Secured cylinder pair ensured. After the sheared pipe part that of the shearing unit 7 facing cylinder pair has passed or at the latest when the sheared pipe part of the shearing unit 7 has reached the opposite cylinder pair, the mandrel is 9 again by the shearing unit 7 facing cylinder pair fixed so that the fixation of the mandrel bar 9 through the shearing unit 7 remote cylinder pair can be solved to pass the sheared pipe part. After the sheared pipe part that of the shearing unit 7 opposite cylinder pair has passed or at the latest when a subsequent sheared off pipe part of the shearing unit 7 facing cylinder pair has reached, the mandrel 9 again by the shearing unit 7 fixed opposite pair of cylinders, so that the fixation of the mandrel 9 through the shearing unit 7 facing cylinder pair can be solved to pass the subsequent sheared pipe part. This ensures that the thorn 10 in particular during an eccentric rotational movement of the first cutting die and the second cutting die 8th is fixed to each other by at least one pair of cylinders, so that the mandrel 10 also and at any time perform the eccentric rotational movement. The removal of a sheared pipe part can thus take place during the shearing off of a subsequent pipe part, whereby the loss time is limited to the time in which a tube compared to an additional method in which the steps of shearing and removal are performed sequentially 2 is pushed by the feed unit in the shear position.

4 shows a detailed view of the device according to the invention 1 , according to 1 , The feeder unit has one on the shaving unit 7 firmly fixed gripper 5 and two feed units, namely a first feed unit 3 and a second feed unit 4 on. Here is the first feed unit 3 with a threaded spindle unit 17 driven by a motor (eg, electric motor) and the second feed unit 4 with a threaded spindle unit 18 , which is driven by a motor (eg electric motor) connected. Because the first feed unit 3 and the second feed unit 4 by two separate threaded spindle units, namely the threaded spindle unit 17 and the threaded spindle unit 18 are driven, are also opposite directions of movement of the feed unit 3 and the feed unit 4 realizable. In contrast to the prior art, in which a gripper and only one feed unit is used, whereby it comes in the assembly of the prior art device with the subsequent pipe to be cut to considerable loss times of about 10 s per Bestückungsvorganges, since the Feed unit at the latest when the remaining previous pipe to be cut is too short to hold it during the Ablängvorganges of the feed unit, the residual pipe passes to the gripper to move to Picking up the subsequent pipe to be cut, with which the previous pipe to be cut through the shearing unit 7 is pushed by the shearing unit 7 To move away, the use of two feed units to avoid loss times. The avoidance of the loss times in the assembly of the device according to the invention is achieved by the fact that, while the second feed unit 4 that the previous pipe to be cut 2 fixed, still on the shearing unit 7 to move, the first feed unit 3 whose fixation of the previous pipe to be cut 2 is solved by the shearing unit 7 is moved away to the subsequent pipe to be cut 2 by fixation, then to it in the direction of the shearing unit 7 to move. After the fixation of the previous pipe to be cut 2 from the second feed unit 4 is solved and the gripper 5 the pipe to be cut 2 has taken over, by means of the pipe to be subsequently severed 2 that through the first feed unit 3 is fixed, the previous pipe to be cut 2 from the gripper 5 be pushed, making the subsequently to be cut pipe 2 in the second feed unit 4 is introduced to from the second feed unit 4 to be fixed. It is conceivable here that the fixation either takes place immediately or after the second feed unit 4 on the first feed unit 3 has moved to. After the tube to be subsequently cut 2 from the second feed unit 4 was fixed, thereby passing through this to the shearing unit 7 is transportable, it is conceivable that the first feed unit 3 the fixation of the tube to be subsequently severed 2 dissolves to the pipe to be subsequently severed 2 at a greater distance to the second feed unit 4 to fix again. It is conceivable here that the second feed unit 4 After fixing the pipe to be subsequently cut 2 in the second feed unit 4 has been solved, in the direction of the first feed unit 3 is moved to subsequently the pipe to be subsequently cut 2 to fix again. To a pipe 2 to move, this and / or this subsequent tube through the first feed unit 3 and / or the second feed unit 4 fixed. The sheared pipe parts can be moved in this way, the removal of a sheared pipe part is also conceivable alone or supported by a removal module.

The 5 to 8th show detailed views of the device according to the invention 1 , according to 1 , with the difference that the threaded spindle unit 17 the first feed unit 3 and the threaded spindle unit 18 the second feed unit 4 on top of each other and not next to each other are arranged, which, however, does not change the operation. In 5 is shown a position of the two feed units, wherein the first feed unit 3 the pipe to be cut the last time to the second feed unit 4 passes. In 6 is shown a position of the two feed units, wherein the first feed unit 3 has solved the fixation of the tube and is returned to pick up the next tube. The remaining long rest piece 19 of the pipe 2 is in this position from the gripper 5 and if necessary. from the second feed unit 4 fixed. To the long rest piece 19 of the pipe 2 the shearing unit 7 will feed, as in 7 shown, the fixation of the long remainder piece 19 of the pipe 2 from the second feed unit 4 solved so that the second feed unit 4 is moved back to the end of the long tail 19 of the pipe 2 yielding mature. In 8th has the gripper 5 the fixation of the pipe 2 solved after the pipe 2 was fixed by the second feed unit. This allows the second feed unit 4 the long leftover piece 19 of the pipe 2 for further processing.

Of course, it would also be conceivable that on the at the shear unit 7 firmly fixed gripper 5 is omitted, whereby the device according to the invention 1 cheaper to produce and low-maintenance would be because the task of the gripper 5 through the second feed unit 4 could be taken over. However, this would have to be ensured that the pipe 2 despite missing gripper 5 receives a fixation while the second feed unit 4 to follow up to the end of the long tail 19 of the pipe 2 As this fixation causes shorter residual pieces to be produced, so less rejects and thus more sections per tube are achieved.

9 shows a perspective view of a shearing unit 7 the device according to the invention 1 , according to 1 ,

The 10 and 11 show side views of the shearing unit 7 , according to 9 ,

12 shows a sectional view of the shearing unit 7 , according to 9 , It becomes clear that the pipe 2 for cutting to length across a pipe 2 extending parting plane 20 in the shearing unit 7 containing a stationary first cutting die 21 and a second cutting die 8th that passes through the dividing plane 20 are separated from each other, is inserted. The second cutting die 8th through a gear 22 is driven by bearings 23 stored and can be an eccentric movement to the stationary first cutting die 21 perform. By inserting the tube 2 in the shearing unit 7 gets a thorn 10 that a thorn rod 9 and a stabilizer 24 , one with the mandrel 9 connected stabilizer part 25 and a flexible stabilizer part 26 has, in the Inside of the pipe 2 that is a longitudinal axis 27 having. The with the mandrel 9 connected stabilizer part 25 and the flexible stabilizer part 26 are through a dividing plane 28 separated, with the parting plane 28 with the parting line 20 flees.

13 shows a sectional view of a mandrel 10 that a thorn rod 9 that has a longitudinal axis 29 has, and a stabilizer 24 according to 12 , The flexible stabilizer part 26 is transverse to the longitudinal axis 29 the mandrel 9 that before the separation process of the longitudinal axis 27 corresponds to the tube, movable. At his the thorn bar 9 facing side, the flexible stabilizer part 26 a bevel 30, with a conical part 31 by at least one spring 32 , preferably at least two springs 32 , is loaded or can be charged, corresponds. A transverse to the longitudinal axis 29 the mandrel 9 applied pressure on the flexible stabilizer part 26 , until then flush with the mandrel 9 connected stabilizer part 25 aligned, causes the flexible stabilizer part 26 transverse to the longitudinal axis 29 the mandrel 9 emotional. This movement becomes the conical part 31 through the slope 30 in the direction of the mandrel 9 shifted, causing the spring 32 is tense. In addition, the flexible stabilizer part 26 by the deflection no longer flush with the mandrel 9 connected stabilizer part 25 aligned, whereby an unillustrated tube, in the interior of which the stabilizer is at least partially, is at least partially severed from inside to outside, whereby the transection of the tube by the first Schneidmatritze and the second Schneidmatritze the cutting unit is complemented from outside to inside.

The 14 to 20 show schematic plan views (left in the figure) and schematic sectional views (each right in the figure) on a shearing unit 7 at a rotation angle of 0 ° ( 14 ), 30 ° ( 15 ), 60 ° ( 16 ), 90 ° ( 17 ), 120 ° ( 18 ), 150 ° ( 19 ) and 180 ° ( 20 ). In the schematic sectional views (in each case on the right in the figure), the feed unit, not shown, is on the right and the removal module, not shown, to the left of the illustrated shearing unit 7 , For ease of illustration, shown in the schematic sectional views (each right in the figure) shown pipe 2 , which was transported by the right-hand feed unit, only from the parting plane 19 shown.

14 represents the situation before the start of the shearing process. At this point in time, when the separation process has not yet begun, the pipe is located 2 within the shearing unit 7 , in particular within the one longitudinal axis 33 having first cutting die 21 facing the feed unit and a longitudinal axis 34 having second Schneidmatritze 8th which faces the removal module. The first cutting mat 21 and the second cutting mat 8th are through the dividing plane 20 separated from each other. Inside the tube 2 the stabilizer of the mandrel is arranged, wherein the stabilizer part connected to the mandrel bar, not shown 25 and the flexible stabilizer part 26 through the dividing plane 28 are separated from each other, wherein the parting plane 28 with the parting line 20 flees. In 14 it becomes clear that before the separation process, the longitudinal axis 27 of the pipe 2 , the longitudinal axis 29 the mandrel, the longitudinal axis 33 the first cutting mat 21 and the longitudinal axis 34 the second Schneidmatritze 8th coaxially (coaxially) are aligned with each other. Since the shearing process has not started yet, the tube is 2 in the schematic plan view (left in the figure) shown completely hatched.

15 shows a schematic plan view (left in the figure) and a schematic sectional view (right in the figure) on a shearing unit 7 at a rotation angle of 30 °. By the incipient shearing the pipe can 2 in a feed unit facing tube part, which is not shown for simplicity and that the longitudinal axis 27 of the pipe 2 has, and a pipe part 35 facing away from the feed unit and from the pipe section facing the feed unit at the parting plane 20 be sheared off, be divided. The pipe part 35 has a longitudinal axis 36 on. Here it becomes clear that due to an eccentric movement of the second Schneidmatritze 8th to the first cutting mat 21 the original coaxial alignment of all longitudinal axes to a coaxial alignment of the longitudinal axis 36 of the pipe part 35 , the longitudinal axis 29 the mandrel 7 and the longitudinal axis 34 the second Schneidmatritze 8th and to a coaxial alignment of the longitudinal axis of the feed unit facing the tube part, the longitudinal axis 27 of the pipe 2 corresponds, and the longitudinal axis 33 the first cutting mat 21 changed. From the 15 to 20 it becomes clear that the longitudinal axis 36 of the pipe part 35 , the longitudinal axis 29 the mandrel 7 and the longitudinal axis 34 the second Schneidmatritze 8th during the separation process always parallel to the longitudinal axis of the feed unit facing tube part, which is the longitudinal axis 27 of the pipe 2 corresponds, and the longitudinal axis 33 the first cutting mat 21 stay aligned.

Furthermore, the show 15 to 20 each on the left in the schematic plan views on the basis of a sectional area 37 , which is shown in black, the progress of the separation of the tube 2 , The cut surface 37 Here, it is clear that the eccentric movement of the second cutting die 8th to the stationary first cutting die 21 not the complete cross-section of the pipe 2 Shearing is applied at once, but a "pulling" shearing action is enabled, thereby avoiding tearing known by the prior art. As in 20 can be seen when using a thorn 10 the separation process is completed after a rotation angle of 180 °, since the mandrel 10 from the inside out cuts and the second cutting die 8th cuts from outside to inside.

The 21 to 27 show schematic representations of the separation process at a rotation angle of 0 ° ( 21 ), 30 ° ( 22 ), 60 ° ( 23 ), 90 ° ( 24 ), 120 ° ( 25 ), 150 ° ( 26 ) and 180 ° ( 27 ). The pipe 2 has an unsevered area depending on the angle of rotation 38 and / or a cut surface 37 on. The first puncture on two sides takes place at a rotation angle between 30 ° and 60 °. At a rotation angle between 120 ° and 150 °, the lower side is completely severed. At a rotation angle between 150 ° and 180 ° then the complete transection of the second side is possible.

All in the description, the following claims and the drawings illustrated features may be essential to the invention both individually and in any combination.

LIST OF REFERENCE NUMBERS

1

contraption

2

pipe

3

First feed unit

4

Second feed unit

5

grab

6

drive unit

7

shearing

8th

Second cutting die

9

mandrel

10

mandrel

11

Gripping and / or fixing unit

12

cylinder

13

brush belt

14

switch

15

Gitterbox

16

Gitterbox

17

Screw unit

18

Screw unit

19

remnant

20

Dividing plane of the pipe and the cutting matrices

21

First cutting die

22

gear

23

storage

24

stabilizer

25

stabilizer part

26

Flexible stabilizer part

27

Longitudinal axis of the tube

28

Parting plane between stabilizer parts

29

Longitudinal axis of the mandrel

30

slope

31

Conical part

32

feather

33

Longitudinal axis of the first cutting mat

34

Longitudinal axis of the second Schneidmatritze

35

Separated pipe part

36

Longitudinal axis of the separated pipe part

37

section

38

Not severed area

Claims (21)

Device (1) for severing a pipe (2) by shearing along a parting line (20) running transversely to a longitudinal axis (26) of the pipe (2), comprising a feed unit for feeding the pipe (2) to be cut, characterized in that the feed unit has a first feed unit (3) and at least one second feed unit (4), wherein the feed units (3, 4) are each connected to separate threaded spindle units (17, 18). Device (1), after Claim 1 , characterized in that the apparatus comprises a shearing unit (7) which can be driven by the tube (2), which has a wall thickness, and which can be driven by at least one drive unit (6), which has a first cutting tab (21) facing the supply unit, and a second cutting die (8) facing away from the feeding unit, the cutting process being carried out by an eccentric relative movement of the first cutting die (21) and the second cutting die (8) relative to one another, and / or the apparatus comprising a mandrel (10) for insertion into the tube (2), wherein the mandrel (10) has a Mandrel (9) having a stabilizer (24) arranged thereon, wherein the stabilizer (24) has a parting plane (28) which is positioned or positionable in the parting plane (20) of the tube (2), whereby the stabilizer (24) on the part of the second cutting die (8) has a stabilizer part (25) connected to the mandrel rod (9) and a flexible stabilizer part (26) from the first cutting die (21), and / or that the mandrel (8) and / or the stabilizer ( 24) is connected to the shearing unit (7). Device (1), after Claim 2 , characterized in that the mandrel bar (9) and / or the stabilizer (24) arranged on the mandrel bar (9) are connected to the second cutting mat (8). Device (1), after Claim 2 or Claim 3 , characterized in that the second cutting mat (8) is a cutting mat which is movable relative to the first cutting mat (21) in an eccentric relative movement. Device (1), according to one of Claims 2 to 4 , characterized in that the first cutting die (21) is a stationary cutting die or the first cutting die (21) and the second cutting die (8) are cutting dies movable relative to the respective other cutting die in an eccentric relative movement. Device (1), according to one of Claims 2 to 5 , characterized in that the eccentricity of the eccentric relative movement is equal to or greater than the wall thickness of the tube (2). Device (1), according to one of Claims 2 to 6 , characterized in that the separation process is completed at a resulting by the rotational movement of the eccentric relative movement angle of rotation of about 180 °. Device (1), according to one of Claims 2 to 7 , characterized in that the mandrel (10) by means of a gripping and / or fixing unit (11) with the second Schneidmatritze (8) is connected. Device (1), according to one of Claims 2 to 8th , characterized in that the device (1) for removing a sheared pipe part (34) has a driven removal module. Device (1), after Claim 9 , characterized in that the removal module with the shaving unit (7) and / or the mandrel (10) is connected. Device (1), after Claim 9 , characterized in that the removal module is connected to the second Schneidmatritze (8). Device (1), according to one of Claims 9 to 11 , characterized in that the removal module is a disposal belt or brush belt (13). Device (1) according to one of the preceding claims, characterized in that at least one feed unit (3, 4) in the direction of the longitudinal axis (27) of the tube (2) to the shearing unit (7) towards or away from the shearing unit (7) is movable. A method of severing a pipe (2) by shearing along a parting plane transverse to a longitudinal axis (27) of the pipe (2), comprising a pipe cutting device (1) comprising a feed unit for feeding the pipe to be cut Having wall thickness tube (2), characterized in that the feed unit for the continuous assembly of the device (1) has a first feed unit (3) and at least one second feed unit (4), wherein the feed units (3, 4) each with separate threaded spindle units (17, 18) are connected. Method, after Claim 14 , characterized in that the device comprises a by the tube (2) having a wall thickness, enforceable and by at least one drive unit (6) drivable shearing unit (7) having a longitudinal axis (33) having first Schneidmatritze (21) and a having a longitudinal axis (34) having second Schneidmatritze (8), wherein the first Schneidmatritze (21) facing the feed unit and the second Schneidmatritze (8) facing away from the feed unit, wherein by an eccentric relative movement of the first Schneidmatritze (21) and the second Schneidmatritze (8) to each other, the separation process is performed, and / or that the device has a mandrel (10) for insertion into the tube (2), wherein the mandrel (10) has a longitudinal axis (29) having a mandrel rod (9) a stabilizer (24) disposed thereon and the mandrel (10) in the execution of the separation process by the eccentric relative movement of the first Schneidmatritze (21) and the second cutting die (8) is moved towards each other, and / or that by the separation process from the tube (2) a tube section facing the delivery unit, which has the longitudinal axis (27) of the tube (2), and a tube part (35), which faces away from the feed unit and has a longitudinal axis (36), wherein prior to the separation process the longitudinal axis (27) of the tube (2), the longitudinal axis (29) of the mandrel bar (9), the longitudinal axis (33) of the first cutting die (21) and the longitudinal axis (34) of the second cutting die (8) are coaxial aligned with each other, wherein the original coaxial alignment by the separation process caused by the movement of the mandrel (10) on a coaxial alignment of the longitudinal axis (36) of the tubular member (35), the longitudinal axis (29) of the mandrel rod (9) and the longitudinal axis (34) of the second cutting die (8) and a coaxial alignment of the longitudinal axis (27) of the feed unit facing tube part and the longitudinal axis (33) of the first Schneidmatritze (21) changed, wherein the longitudinal axis (36) of the tube part (35), the longitudinal axis (29) of the mandrel rod (9) and the longitudinal axis (34) of the second cutting die (8) during the separation process always parallel to the longitudinal axis (27) of the tube section facing the supply unit and the longitudinal axis (33) first cutting tab (21) remain aligned. Method, after Claim 15 , characterized in that the stabilizer (24) has a parting plane (28) which is positioned or positionable in the parting plane (20) of the tube (2), whereby the stabilizer (24) on the part of the first cutting tab (21) with the Mandrel (9) connected stabilizer part (25) and the part of the second Schneidmittritze (8) has a flexible stabilizer part (26), so that after the severing of the tube (2) through which two pipe parts formed, with the mandrel rod (9) connected stabilizer part (25) in the one tube part (35) and the flexible stabilizer part (26) is located in the other tube part. Method, after Claim 14 or Claim 16 in that the mandrel (10) is connected to a cutting mat which moves eccentrically relative to the other cutting mat. Procedure, according to one of Claims 15 to 17 , characterized in that at the end of the separation process at a by the eccentric relative movement of the first Schneidmatritze (21) and the second Schneidmatritze (8) to each other resulting rotation angle is 180 °. Procedure, according to one of Claims 15 to 18 , characterized in that the tube (2) during the separation process through the mandrel (10) from the inside to the outside and through the shearing unit (7) is cut from the outside inwards. Procedure, according to one of Claims 15 to 19 , characterized in that a shearing operation carried out during the cutting process is a drawing shearing operation. Procedure, according to one of Claims 15 to 20 , characterized in that as device (1) for cutting through a pipe (2) a device (1) according to one of Claims 1 to 13 , is used.

Images