DE102017126721A1 - Method and device for cutting workpieces made of plastic - Google Patents

Abstract

The invention relates to a device (1) for cutting a workpiece (2) made of plastic, in particular a plastic profile, comprising a cutting blade for cutting the workpiece (2) and a feed device (5) for delivering the cutting blade to a region to be cut (4). of the workpiece (2) and / or for delivering the area to be cut (4) of the workpiece (2) to the cutting blade. It is further provided that the cutting blade is designed as a circular blade (3), wherein the circular blade (3) is rotatably mounted about a rotational axis (A) so that the circular blade (3) during cutting at the area to be cut (3) 4) of the workpiece (2) rolls.

Description

The invention relates to a device for cutting a workpiece made of plastic, in particular a plastic profile, according to the preamble of claim 1.

The invention also relates to a system for producing a workpiece made of plastic, in particular a plastic profile.

The invention also relates to a method for cutting a workpiece made of plastic, in particular a plastic profile, according to the preamble of claim 10.

Furthermore, the invention relates to the use of a non-driven rotary blade for cutting elongated plastic profiles made of hard plastic.

A generic method and apparatus for cutting a workpiece made of plastic is in the EP 0 795 383 A1 described.

In the manufacture and processing of workpieces or articles made of plastic, it is often necessary in practice to cut the workpieces during manufacture, for example, to provide them with slots or cut to length.

Soft plastics, d. H. Workpieces made of soft plastic are preferably cut with cutting blades. In this process, are used in the cutting blade with straight blades used, advantageously no chips, powder or the like.

However, harder plastics, in particular workpieces made of hard plastic, can often not be divided like soft plastics in practice, since they can easily and uncontrollably break during processing due to the required high cutting pressure. For this reason, hard plastics are machined in practice, d. H. Sawed with saws or cutting knives with profiled cutting edge.

The machining, however, has some disadvantages compared to chip-free cutting, which must be taken into account when processing the hard plastics.

For example, the minimum widths of the slots to be introduced by the saw blades during sawing are usually greater than the minimum widths which can be achieved with narrow knife blades when cutting.

Furthermore, sawing can cause a high level of noise.

Furthermore, so-called burrs, that is known as burrs, are produced by the sawing process. H. sharp-edged fiberizing on the saw edges, which requires post-processing (deburring) of the workpiece.

Not least, sawing is known to produce chips, resulting in contamination of the saw and the workpiece. Due to the electrostatic properties of plastic, the chips can sometimes be difficult to remove.

For further background is based on the generic EP 0 795 383 A1 See, in which a method and an apparatus for cutting slots in a tube made of plastic with corrugated profile is described. In this case, rotating driven cutting blade are used with hook-shaped curved cutting surfaces, incurred during cutting chips with relatively large thickness.

The present invention has for its object to provide an improved apparatus and an improved method for cutting a workpiece made of plastic, which in particular also allows a simple cutting of workpieces made of hard plastic.

The present invention is also based on the object to provide a system for producing a workpiece made of plastic, which in particular allows a more advantageous machining of the workpiece, as the known prior art.

Finally, the invention is also based on the object to provide a simple tool for cutting elongated plastic profiles made of hard plastic (use).

The object is achieved for the device by claim 1 and for the method by claim 10. Regarding the system, the object is solved by claim 9 and with respect to the use by claim 12.

The dependent claims relate to advantageous embodiments and variants of the invention.

The device according to the invention for cutting a workpiece made of plastic, in particular a plastic profile, comprises a cutting blade for cutting the workpiece and a feed device for delivering the cutting blade to a region of the workpiece to be cut and / or for delivering the area of the workpiece to be cut to the cutting blade.

According to the invention, it is provided that the cutting blade is designed as a circular blade, wherein the circular blade is so driven, but rotatably mounted about a rotational axis, that the circular blade rolls during cutting on the region of the workpiece to be cut.

Preferably, the circular blade has a circumferential, straight cutting edge (in contrast to an example, wave- or zigzag-shaped profiled cutting edge in the manner of a saw blade).

The circular blade is designed to "split" the workpiece preferably in the sense of the DIN standard DIN 8588: 2003-09, d. H. without chip formation (chips, powder, etc.) to cut mechanically - in contrast to a machining.

The workpiece is cut by the cutting edge of the circular blade and not sawed, resulting in no (or at least negligible) chips or burrs during processing. A post-processing, for example, a deburring of the workpiece at the cutting edges or removal of chips, powder or the like, can thus be omitted.

Characterized in that the circular blade is driven rotatably about its axis of rotation rotatably and thus corresponding drive means omitted, the noise of the device when cutting the workpiece is negligible.

Another advantage of a non-driven rotary blade or knife is that the workpiece does not overheat during machining. Unfavorable melting of the plastic can thus be prevented.

By virtue of the fact that the circular blade can roll during cutting, the cutting pressure required for cutting, which is introduced into the workpiece via the circular blade, can be reduced, which results in breakage of the workpiece during cutting, in particular if the workpiece is made of hard plastic. can prevent. Thus, workpieces made of plastic, in particular plastic profiles, for example workpieces made of hard plastic, can be cut with comparatively less effort without the workpiece breaking uncontrolled. While it is essentially only possible with the devices and methods of the prior art to cut workpieces made of soft plastic, workpieces made of hard plastic can now also be cut.

It may be a plain bearing or rolling bearing, for example a ball bearing, in particular a deep groove ball bearing, be provided to support the cutting blade rotatable about its axis of rotation.

A possible low-friction bearing of the circular blade around its axis of rotation may be advantageous so that the circular blade can roll particularly easily during cutting. Preferably, the circular blade is free or friction and / or completely rotatably mounted about its axis of rotation.

The cutting pressure to be introduced for cutting or the necessary cutting force, which is preferably orthogonal to the region to be cut via the circular blade in the workpiece can be reduced by the freely rotatable mounting of the circular blade than when using a straight cutting blade. Basically, low cutting pressures and thus a possible frictionless storage of the circular blade to be preferred; but it can also be provided to specifically specify the cutting pressure or the cutting force by adjusting the bearing friction.

In a development of the invention, provision is made in particular for the device to be designed for cutting elongated plastic profiles, in particular of hard plastic.

While referred to as soft plastic, particularly flexible plastics, especially soft PVC and polyolefins, z. As polyethylene, optionally also by simpler measures, for. As a straight, non-rotatable cutting blade, can be cut, the invention is particularly suitable for use with rigid plastics ("hard plastic"). Plastics referred to as hard plastic can count both to the group of thermoplastics and thermosets.

The invention is also particularly suitable for cutting a workpiece made of soft plastic with a wall thickness greater than 0.5 mm, preferably greater than 1 mm, more preferably greater than 2 mm, and most preferably greater than 5 mm.

The invention is also suitable for cutting workpieces made of soft plastics, which in turn have a stiffness which is too high for conventional cutting methods due to a correspondingly large material thickness.

In a further development of the invention, it can also be provided, in particular, that the device is designed for cutting, in particular for cutting to length, roller shutter profiles, window profiles and / or plastic pipes, in particular sewage pipes.

Such profiles or pipes are often made of hard plastic and can only be sawed or cut by means known from the prior art measures. By the device according to the invention, however, it is possible to cut such profiles or pipes without generating chips.

In a further development of the invention it can be provided that the feed device has guide means and / or drive means for guiding the circular blade during cutting through the region of the workpiece to be cut and / or around the region of the workpiece to be cut during cutting on the circular blade along out.

In particular, guide means and / or drive means may be provided for guiding the circular blade or its cutting edge tangentially over / through the region of the workpiece to be cut during cutting, or for rolling over this region in order to introduce a cut into the workpiece.

Furthermore, guide means and / or drive means may be provided to introduce a (small) cutting pressure or a (small) cutting force orthogonal to the rolling motion through the circular blade in the workpiece.

Finally, further guide means and / or drive means may be provided to deliver the area of the workpiece to be cut to the circular blade or its cutting edge.

A guide means may be, for example, a rail guide, a slotted guide, a conveyor belt, one or more transport rollers and / or a telescopic guide.

The one or more drive means may comprise electrical, hydraulic and / or pneumatic actuators. For example, an electric motor and / or a linear actuator can be provided.

It can be provided that a piece of workpieces is delivered via a conveyor belt and / or via one or more transport rollers to the circular blade, after which the circular blade is rolled over the area to be cut using a rail system, wherein during the rolling movement a sufficiently large cutting pressure in the workpiece is introduced to produce a cut. Subsequently, the circular blade can be pulled back over the rail system and the cut workpiece can be ejected from the device, after which a further part of the workpiece piece goods is delivered to the circular blade.

In a development of the invention, a fixing device can be provided as part of the device in order to fix the workpiece at least adjacent to the region to be cut during cutting.

A fixing device can serve to improve the accuracy of the cutting, for example the positioning of the cut. However, a fixture may also serve to reduce the likelihood of uncontrolled fracture in the workpiece during cutting.

A fixation is advantageously carried out as close to the area to be cut, as is technically feasible or as allowed by the space within the device. The fixation can be provided on both sides of the area to be cut or only on one side.

In a development, it can be provided that the fixing device comprises deliverable clamping jaws.

It can thus be provided, for example, a delivery of jaws in the manner of baking a vise to securely clamp or clamp the workpiece during cutting.

The delivery of the jaws can for example be done electrically, pneumatically and / or hydraulically.

In a development, it can also be provided that the fixing device has at least one fixing unit with an inner contour, wherein the inner contour is modeled on an outer contour of the workpiece to be cut and is suitable for guiding the workpiece to be cut at least in a partial area.

The workpiece to be cut can thus be pushed through the at least one fixing unit and is then movable only in the insertion direction or counter to the insertion direction, d. H. positively locked or fixed in all but one degree of freedom. The remaining degree of freedom can then - optionally - be blocked by another positive connection or by frictional connection, in particular during cutting. The cutting itself can also contribute to blocking the last degree of freedom.

Preferably, the guide is performed by the at least one fixing approximately free of play.

According to the invention, two fixing units with the inner contour described above can be provided to fix the workpiece on both sides of the area to be cut.

Bending of the workpiece during cutting, z. B. by an excessive cutting pressure, can thus be sufficiently prevented to prevent breakage or irreversible deformation of the workpiece by cutting.

It can also be provided that an exchange unit or a modular construction kit of fixing units with different inner contours is used in order to enable a quick and easy conversion of the apparatus for processing workpieces of different geometries or the processing of different plastic profiles. The device can thus be easily adaptable. For example, a first fixing unit may have an inner contour, which is modeled on an outer contour of a roller shutter profile, and a second fixing unit may have an inner contour, which is modeled on a window profile. By replacing the fixing unit of the fixing device can then be cut either a roller shutter profile or a window profile.

In a development of the invention, a heating device may be provided as part of the device in order to heat the workpiece to be cut before cutting, preferably to a temperature greater than 30 ° C., more preferably to a temperature greater than 40 ° C., and most preferably to a temperature greater than 50 ° C. Preferably, a temperature is selected which is less than 100 ° C.

The workpiece can thereby be softened for machining. In particular, a hard plastic workpiece can be cut more easily without causing breakage. The heating of the workpiece can, in combination with the rotary drive according to the invention rotatable circular blade, especially very hard plastics, especially plastic profiles made of hard plastic, cut without cutting, which could be sawn only with the previously known measures.

For example, a radiant heater, hot air generator, laser or other heat source may be provided for heating the workpiece. It can be provided to arrange the device at least partially within a furnace and / or to heat the workpiece before processing in an oven and / or to transport it through an oven.

The invention also relates to a method for cutting a workpiece made of plastic, in particular a plastic profile, according to which a cutting blade is delivered to a region of the workpiece to be cut and / or the region of the workpiece to be cut to the cutting blade.

The inventive method provides that a non-driven, but rotatable about a rotation axis circular blade is used as a cutting blade that rolls freely rotatable during cutting at the area to be cut.

Features that have already been described in connection with the device according to the invention are of course also for the inventive method or the system described below and the use described below advantageously implemented - and vice versa. Furthermore, advantages which have already been mentioned in connection with the device according to the invention can also be understood based on the method according to the invention, the system according to the invention or the use according to the invention - and vice versa.

Characterized in that a circular blade is used, which can roll freely rotatable even during cutting at the area to be cut and in particular is not driven, a cutting of the workpiece can be done by much less force.

Due to the reduced cutting pressure, breakage of the workpiece can almost be ruled out, as a result of which cutting or cutting of workpieces is also possible for hard plastics.

For example, the invention can be used to cut elongated plastic profiles from hard plastic to any length. The finished cut workpiece made of plastic can thus be arbitrarily short in the meaning of the invention and, for example, separated from a plastic profile by the meter. In particular, an "infinite" plastic profile, which is produced continuously in an extruder and ejected from it, can be cut according to the invention to any desired length.

In a development of the method, provision can be made, in particular, for the workpiece to be heated before cutting, preferably to a temperature greater than 30 ° C., more preferably to a temperature greater than 40 ° C and most preferably to a temperature greater than 50 ° C.

Particularly suitable is a temperature at which it does not come to an (irreversible) deformation of the plastic, but which is already high enough to affect the material properties, in particular the hardness of the plastic, advantageously, to break the plastic during cutting to prevent.

The invention also relates to a system for producing a workpiece made of plastic, in particular a plastic profile comprising an extruder for forming the workpiece and a downstream device for cutting the workpiece according to the above, in the still warm state in the To cut device.

By a "still warm state" is meant in particular that the workpiece during cutting has a temperature which is greater, preferably significantly greater, in particular at least 10 ° C higher than the ambient temperature or the room temperature.

Since workpieces made of plastic can be produced by using the extrusion process, which operates at high temperatures, the invention is particularly suitable for combination with an extrusion process or with an extruder, for example for cutting or cutting the plastic parts emerging from the extruder.

For example, a workpiece made of plastic or a plastic profile "infinite length" can be prepared by extrusion and fed after exiting the extruder in the apparatus for cutting to cut to length, d. H. to be cut into individual pieces of desired length.

Since the invention lends itself particularly well to the processing of hot workpieces, a particularly high production throughput can be achieved if a manufacturing process combining extrusion and cutting is used.

Finally, the invention relates to a novel use of a non-driven rotary blade for cutting elongated plastic profiles made of hard plastic, in particular roller shutter profiles, window profiles and / or plastic pipes, wherein the circular blade is rotatably mounted about a rotation axis.

While in the prior art for cutting a workpiece made of hard plastic or hard plastic always only a machining with usually driven cutting blades (usually saws or saw blades) is provided, the inventors have realized that when using a non-driven rotary blade, but by a Rotation axis is freely rotatably mounted, a non-cutting cutting a workpiece made of hard plastic or hard plastic is possible.

However, a use of a non-driven circular blade for cutting elongated plastic profiles made of soft plastic or soft plastic may be provided when the circular blade is rotatably mounted about a rotation axis.

Particularly advantageous may be the use of a rotatably mounted, non-driven circular blade for cutting elongated plastic profiles, in particular within a device for automated cutting to length of the plastic profiles.

Furthermore, use of the circular blade within a system for the automatic production of elongated plastic profiles may be of particular advantage, in particular if the system has an extruder for shaping the plastic profiles and a device (downstream of the extruder) for cutting the plastic profiles.

In addition, it should be noted that terms such as "comprising", "having" or "having" do not exclude other features or steps. Further, terms such as "a" or "that" indicating a singular number of steps or features do not exclude a plurality of features or steps - and vice versa.

Embodiments of the invention will be described in more detail with reference to the drawing.

The figures each show preferred embodiments in which individual features of the present invention are illustrated in combination with each other. Features of an exemplary embodiment can also be implemented independently of the other features of the same exemplary embodiment and can accordingly be readily connected by a person skilled in the art to further meaningful combinations and sub-combinations with features of other exemplary embodiments.

In the figures, functionally identical elements are provided with the same reference numerals.

• 1 eine Vorderansicht auf eine erfindungsgemäße Vorrichtung zum Schneiden eines Werkstücks aus Kunststoff in einer ersten Ausführungsform;
• 2 ein erfindungsgemäßes System zur Herstellung eines Werkstücks aus Kunststoff mit einem Extruder und der Vorrichtung der 1 in einer Seitenansicht;
• 3 eine Vorderansicht auf einen Ausschnitt einer Vorrichtung zum Schneiden eines Werkstücks aus Kunststoff in einer zweiten Ausführungsform;
• 4 eine Fixiereinrichtung mit zustellbaren Spannbacken; und
• 5 eine Fixiereinrichtung mit einer modularen Fixiereinheit.

They show schematically:

• 1 a front view of an inventive device for cutting a workpiece made of plastic in a first embodiment;
• 2 an inventive system for producing a workpiece made of plastic with an extruder and the device of 1 in a side view;
• 3 a front view of a section of an apparatus for cutting a workpiece made of plastic in a second embodiment;
• 4 a fixing device with deliverable jaws; and
• 5 a fixing device with a modular fixing unit.

1 shows a device 1 for cutting a workpiece 2 made of plastic, which in the embodiment of the 1 to 3 around a straight, rectangular plastic profile, in 4 around a pipe and in 5 is a roller shutter profile. Preferably, the device 1 be designed for cutting elongated plastic profiles, in particular of hard plastic. However, the invention is not for use with elongate plastic profiles or for use with a workpiece 2 hard plastic to understand limited. Basically, the device can 1 also for cutting a workpiece 2 be used from a soft plastic or soft plastic.

The device 1 includes a circular blade 3 trained cutting blade for cutting the formed as a plastic profile workpiece 2 , The circular knife 3 is so driving around a rotation axis A, but rotatably mounted, that the circular blade 3 during cutting on an area to be cut 4 (see cross-hatched areas in 2 and 4 ) of the workpiece 2 or the plastic profile unrolls. In particular, a tangential movement of the circular blade 3 along the area to be cut 4 of the workpiece 2 be provided.

The device 1 further comprises a delivery device 5 for the delivery of the circular blade 3 to the area to be cut 4 of the workpiece 2 and for delivery of the area to be cut 4 of the workpiece 2 to the circular knife 3 (in 2 shown). In the embodiment, a first part 5.1 the delivery device 5 for the delivery of the circular blade 3 to the area to be cut 4 in the direction of the arrow X and an in 2 closer illustrated second part 5.2 the delivery device 5 for delivery of the area to be cut 4 to the circular knife 3 orthogonal to the feed direction X of the circular blade 3 along the arrow Y the 2 intended.

The in the 1 and 2 illustrated first part 5.1 the delivery device 5 for the delivery of the circular blade 3 to the area to be cut 4 comprises guide means in the manner of a telescopic extension 6 and drive means, in the embodiment as a pneumatic actuator 7 with compressed air supply 8th trained to the circular knife 3 during cutting through the area to be cut 4 respectively.

Also the second part 5.2 the delivery device 5 for delivery of the area to be cut 4 of the workpiece 2 to the circular knife 3 may comprise guide means and / or drive means; this is related to 2 explained below.

In the embodiment of 1 is a fixing device 9 provided to fix the workpiece adjacent to the area to be cut during cutting.

The fixing device 9 the 1 is in 2 in a side view and for further clarification in 5 shown separately in an isometric view.

The fixing device 9 includes at least one fixing unit 10 with an inner contour 11 (in the 1 and 3 as a contour of a rectangular profile and in 5 shown as the contour of a roller shutter profile), wherein the inner contour 11 an outer contour 12 of the workpiece to be cut 2 is modeled and is suitable for the workpiece to be cut 2 at least in a subarea to lead in itself.

It may be beneficial to use two fixation units 10 provide to the workpiece 2 on both sides of the area to be cut 4 to fix, as in 2 by a second, shown in dashed fuser 10 indicated. But it can also only a single fuser 10 be used, preferably as close as possible to the area to be cut 4 is arranged. Basically, any number of fixation units 10 be provided, even more than two fuser units 10 For example, three, four, or more fuser units 10 ,

The at least one fixing unit 10 can in a holding device 13 be included (cf. 1 . 2 and 5 ) or even as a holding device 13 be educated (cf. 3 ).

Basically, a modular system of fuser units 10 be provided, each having different inner contours 11 and in the fixing device 9 , for example in the holder 13 , are quick and easy to replace. For example, the fuser units 10 using a fixing screw 14 or a comparable fastening means in the holding device 13 be attached as in 5 indicated.

Optionally, the device has 1 a heating device 15 on to the workpiece to be cut 2 to heat before cutting, preferably to a temperature greater than 30 ° C, more preferably to a temperature greater than 40 ° C and most preferably to a temperature greater than 50 ° C. The heater 15 is in 1 only shown schematically and has an exemplary heating coil 16 on. Basically, any heating device 15 be provided, for example, can also be provided that the device 1 or the workpiece 2 at least partially disposed in an oven or that the device 1 having an oven. A hot air blower or a laser can also be used to heat the workpiece 2 be provided.

2 shows the device of 1 in a side view and in use within a system 17 for the production of a workpiece 2 plastic, comprising an extruder 18 for shaping the workpiece 2 , the device 1 is preceded by cutting. This can be done from the extruder 18 emerging workpiece 2 while still warm in the device 1 get cut. The extruder 18 is only indicated strongly schematized.

That from the extruder 18 emerging workpiece 2 , in the present case an elongated plastic profile, the device 1 supplied as workpiece workpiece or "infinite" plastic profile for cutting (by the arrow Y indicated) and cut to length in this. For delivery, the second part 5.2 the delivery device 5 be provided, for example, the guide means in the manner of transport rollers 19 and is driven by non-illustrated drive means, such as an electric motor.

Furthermore, the device 1 the fixing device already described 9 with a fuser 10 on that in a holding device 13 recorded and fixed. In the embodiment of 2 is a second, optional fuser unit 10 shown in dashed lines.

Preferably, the supply of the workpiece 2 , z. B. the drive of the transport rollers 19 stopped while cutting. After cutting the workpiece 2 can cut to size, finished workpiece parts 20 be ejected, for example by the workpiece-yard goods or the workpiece 2 over the transport wheels 19 is postponed.

The device 1 for cutting or the system 17 for the production of the workpiece 2 can or can especially for cutting to length shutter profiles (see. 5 ), Window profiles and / or plastic pipes (cf. 4 ) be formed.

A device 1 for cutting a workpiece 2 with an alternative delivery device 5 is in 3 shown. The delivery device 5 has guide means in the manner of a rail system 21 on, about the circular knife 3 through a sledge 22 in a rail 23 is displaceable. For example, this may be done using a cable operated by an electric motor attached to the carriage 22 is attached (not shown). Thus the round knife becomes 3 at the area to be cut 4 of the workpiece 2 while cutting in the direction of arrow X along.

While the circular knife 3 through the area to be cut 4 of the workpiece 2 is guided, this rolls around its axis of rotation due to the freely rotatable mounting A at the area to be cut 4 of the workpiece 2 over its circumference (see arrow U ), whereby only a small force or cutting pressure is required.

Preferably, the circular blade 3 tangent to its cutting edge over the area to be cut 4 of the workpiece 2 guided.

Another example of a fixing device 9 is in 4 shown. The illustrated fixing device 9 includes deliverable jaws 24 to the workpiece 2 adjacent to the area to be cut 4 to fix during cutting. Alternatively or additionally, clamping jaws may also be provided on the other side of the area to be cut 4 be provided. It can be provided any number of clamping jaws, possibly even a single jaw 24 ,

Basically, a fixing device 9 be provided at the at least one fixing unit 10 with at least one jaw 24 , preferably with two clamping jaws 24 , combined.

At the in 4 represented workpiece 2 it is a pipe made of plastic, preferably a sewage pipe made of hard plastic. After delivery of the circular knife 3 to the area to be cut 4 can the workpiece 2 be rotated about its central axis or longitudinal axis to the circular blade 3 over the area to be cut 4 unroll.

QUOTES INCLUDE IN THE DESCRIPTION

This list of the documents listed by the applicant has been generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Cited patent literature

• EP 0795383 A1 [0005, 0014]

Claims (12)

Device (1) for cutting a workpiece (2) made of plastic, in particular a plastic profile, comprising a cutting blade for cutting the workpiece (2) and a feed device (5) for delivering the cutting blade to a region (4) to be cut of the workpiece (2 ) and / or for the delivery of the area to be cut (4) of the workpiece (2) to the cutting blade, characterized in that the cutting blade is designed as a circular blade (3), wherein the circular blade (3) about a rotational axis (A) without drive but is rotatably mounted, that the circular blade (3) during the cutting on the area to be cut (4) of the workpiece (2) rolls. Device (1) according to Claim 1 , characterized in that the feed device (5) comprises guide means (6, 19, 21) and / or drive means (7) for guiding the circular blade (3) during the cutting through the region (4) of the workpiece (2) to be cut lead and / or around the area to be cut (4) of the workpiece (2) during the cutting along the circular blade (3). Device (1) according to Claim 1 or 2 , characterized in that a fixing device (9) is provided to fix the workpiece (2) at least adjacent to the area to be cut (4) during cutting. Device (1) according to Claim 3 , characterized in that the fixing device (9) deliverable jaws (24). Device (1) according to Claim 3 or 4 , characterized in that the fixing device (9) has at least one fixing unit (10) with an inner contour (11), wherein the inner contour (11) of an outer contour (12) of the workpiece to be cut (2) is modeled and is suitable, the cutting workpiece (2) to perform at least in a partial area. Device (1) according to one of Claims 1 to 5 , characterized in that a heating device (15) is provided to heat the workpiece to be cut (2) before cutting, preferably to a temperature greater than 30 ° C, more preferably to a temperature greater than 40 ° C, and all particularly preferably to a temperature greater than 50 ° C. Device (1) according to one of Claims 1 to 6 , characterized in that the device (1) for cutting elongated plastic profiles, in particular consisting of hard plastic, is formed. Device (1) according to one of Claims 1 to 7 , characterized in that the device (1) for cutting, in particular for cutting to length, roller shutter profiles, window profiles and / or plastic pipes is formed. System (17) for producing a workpiece (2) from plastic, in particular a plastic profile, comprising an extruder (18) for forming the workpiece (2) and a downstream device (1) for cutting the workpiece (2) according to one of Claims 1 to 8th in order to cut the workpiece (2) exiting the extruder (18) while still hot in the device (1). Method for cutting a workpiece (2) made of plastic, in particular a plastic profile, according to which a cutting blade is delivered to a section (4) of the workpiece (2) to be cut and / or the section (4) of the workpiece (2) to be cut to the cutting knife is characterized in that a non-driven, but about a rotation axis (A) rotatable circular blade (3) is used as a cutting blade, which rolls freely rotatable during cutting at the area to be cut (4). Method according to Claim 10 , characterized in that the workpiece (2) is heated prior to cutting, preferably to a temperature greater than 30 ° C, more preferably to a temperature greater than 40 ° C, and most preferably to a temperature greater than 50 ° C. Use of a non-driven rotary blade (3) for cutting elongated plastic profiles (2) made of hard plastic, in particular roller shutter profiles, window profiles and / or plastic pipes, wherein the circular blade (3) is rotatably mounted about a rotation axis (A).

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