EP3978378A1 - Cutting device and method for producing a cutting stamp - Google Patents

Cutting device and method for producing a cutting stamp Download PDF

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Publication number
EP3978378A1
EP3978378A1 EP21199898.4A EP21199898A EP3978378A1 EP 3978378 A1 EP3978378 A1 EP 3978378A1 EP 21199898 A EP21199898 A EP 21199898A EP 3978378 A1 EP3978378 A1 EP 3978378A1
Authority
EP
European Patent Office
Prior art keywords
cutting
punch
transverse
cutting device
contour
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP21199898.4A
Other languages
German (de)
French (fr)
Other versions
EP3978378B1 (en
Inventor
Konrad Mößnang
Dominik Jacobi
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Multivac Sepp Haggenmueller GmbH and Co KG
Original Assignee
Multivac Sepp Haggenmueller GmbH and Co KG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
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Publication of EP3978378A1 publication Critical patent/EP3978378A1/en
Application granted granted Critical
Publication of EP3978378B1 publication Critical patent/EP3978378B1/en
Active legal-status Critical Current
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B26—HAND CUTTING TOOLS; CUTTING; SEVERING
    • B26F—PERFORATING; PUNCHING; CUTTING-OUT; STAMPING-OUT; SEVERING BY MEANS OTHER THAN CUTTING
    • B26F1/00—Perforating; Punching; Cutting-out; Stamping-out; Apparatus therefor
    • B26F1/38—Cutting-out; Stamping-out
    • B26F1/44—Cutters therefor; Dies therefor
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D28/00—Shaping by press-cutting; Perforating
    • B21D28/24—Perforating, i.e. punching holes
    • B21D28/34—Perforating tools; Die holders
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B26—HAND CUTTING TOOLS; CUTTING; SEVERING
    • B26F—PERFORATING; PUNCHING; CUTTING-OUT; STAMPING-OUT; SEVERING BY MEANS OTHER THAN CUTTING
    • B26F1/00—Perforating; Punching; Cutting-out; Stamping-out; Apparatus therefor
    • B26F1/02—Perforating by punching, e.g. with relatively-reciprocating punch and bed
    • B26F1/14—Punching tools; Punching dies
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B26—HAND CUTTING TOOLS; CUTTING; SEVERING
    • B26F—PERFORATING; PUNCHING; CUTTING-OUT; STAMPING-OUT; SEVERING BY MEANS OTHER THAN CUTTING
    • B26F1/00—Perforating; Punching; Cutting-out; Stamping-out; Apparatus therefor
    • B26F1/38—Cutting-out; Stamping-out
    • B26F1/3846—Cutting-out; Stamping-out cutting out discs or the like
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65B—MACHINES, APPARATUS OR DEVICES FOR, OR METHODS OF, PACKAGING ARTICLES OR MATERIALS; UNPACKING
    • B65B61/00—Auxiliary devices, not otherwise provided for, for operating on sheets, blanks, webs, binding material, containers or packages
    • B65B61/005—Auxiliary devices, not otherwise provided for, for operating on sheets, blanks, webs, binding material, containers or packages for removing material by cutting
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B26—HAND CUTTING TOOLS; CUTTING; SEVERING
    • B26F—PERFORATING; PUNCHING; CUTTING-OUT; STAMPING-OUT; SEVERING BY MEANS OTHER THAN CUTTING
    • B26F1/00—Perforating; Punching; Cutting-out; Stamping-out; Apparatus therefor
    • B26F1/38—Cutting-out; Stamping-out
    • B26F1/44—Cutters therefor; Dies therefor
    • B26F2001/4436—Materials or surface treatments therefore
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B26—HAND CUTTING TOOLS; CUTTING; SEVERING
    • B26F—PERFORATING; PUNCHING; CUTTING-OUT; STAMPING-OUT; SEVERING BY MEANS OTHER THAN CUTTING
    • B26F1/00—Perforating; Punching; Cutting-out; Stamping-out; Apparatus therefor
    • B26F1/38—Cutting-out; Stamping-out
    • B26F1/44—Cutters therefor; Dies therefor
    • B26F2001/4463—Methods and devices for rule setting, fixation, preparing cutting dies
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B26—HAND CUTTING TOOLS; CUTTING; SEVERING
    • B26F—PERFORATING; PUNCHING; CUTTING-OUT; STAMPING-OUT; SEVERING BY MEANS OTHER THAN CUTTING
    • B26F1/00—Perforating; Punching; Cutting-out; Stamping-out; Apparatus therefor
    • B26F1/38—Cutting-out; Stamping-out
    • B26F1/44—Cutters therefor; Dies therefor
    • B26F2001/4472—Cutting edge section features
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B26—HAND CUTTING TOOLS; CUTTING; SEVERING
    • B26F—PERFORATING; PUNCHING; CUTTING-OUT; STAMPING-OUT; SEVERING BY MEANS OTHER THAN CUTTING
    • B26F1/00—Perforating; Punching; Cutting-out; Stamping-out; Apparatus therefor
    • B26F1/38—Cutting-out; Stamping-out
    • B26F1/44—Cutters therefor; Dies therefor
    • B26F2001/4481—Cutters therefor; Dies therefor having special lateral or edge outlines or special surface shapes, e.g. apertures

Definitions

  • the present invention relates to a cutting device according to claim 1 and a method for producing a cutting punch according to claim 12.
  • a cutter for punching round packaging corners is from DE 202 16 772 U1 famous.
  • Star-shaped cutting punches are used on this cutting device, which are present together with correspondingly star-shaped recesses as a punching tool.
  • the cutting punch has a two-dimensional cutting contour that corresponds to the shape to be punched out.
  • EP 3 109 017 B1 discloses a thermoforming packaging machine whose cross-cutting device is designed as a film punch in order to sever a film web in a direction transverse to the transport direction between adjacent troughs.
  • packaging in particular round packaging corners, has hitherto been punched or produced by means of crush cutting.
  • the problem is that high production costs arise in the production of stamping tools due to their high manufacturing accuracy.
  • extremely high punching forces result from the operation of punching tools, which have to be absorbed by means of a complex construction. This is also accompanied by increased energy consumption on the packaging machine.
  • the punching process can produce a significant amount of waste material, which is present, for example, in the form of a residual skeleton, which has to be wound up at the exit of a thermoforming packaging machine with a relatively large volume and then has to be disposed of at high cost.
  • increased foil consumption can occur due to the complex structure and the geometry of the punching tools.
  • the invention is based on the object of providing a cutting device and a method for producing a cutting punch, as a result of which the above disadvantages described in connection with the prior art can at least be reduced.
  • the invention relates to a cutting device that is designed to cut substantially round packaging corners from a film web, the cutting device having at least one cutting tool that includes a cutting punch that has at least one concavity on its outside that is provided for forming a cutting edge of the cutting punch is.
  • the cutting edge has a cutting contour that runs both in the transverse and in the longitudinal extension of the cutting punch.
  • the cutting contour thus runs three-dimensionally on the body of the cutting punch, i.e. not just two-dimensionally parallel to the cutting plane, as is the case with known punching punches.
  • the cutting edge according to the invention continues to cut through the film web with increasing penetration depth (i.e. advancing in the cutting or film plane) until the film cut is completely made.
  • the cutting edge can be pulled through the film web by means of comparatively low cutting forces.
  • the cutting edge when the cutting punch is in the fastened state on the cutting device, the cutting edge has a curved cutting contour when viewed both in the horizontal and in the vertical plane of projection. Consequently, the cutting edge used in the invention differs from cutting edges, such as are typically formed on cutting dies of punching tools, by a cutting contour whose profile deviates from the film shape to be cut out. This allows the cutting edge according to the invention not to pierce the film web with the entire cutting edge at once during the cutting process, but instead initially to a certain extent in a punctiform manner and, with increasing penetration depth, pulls the film web along its cutting contour and severs it.
  • the cutting edge according to the invention promotes a cutting progression along its three-dimensional cutting contour that increasingly progresses in the cutting or foil plane, which can be carried out without any problems at a high cutting speed to increase productivity and on the other hand requires lower cutting forces compared to known abrupt punching processes. Overall, the energy balance of the cutting device can also be significantly improved as a result.
  • gradually continuing along the cutting edge In the course of the cut, film sections of any shape can also be better completely cut free, because the film sections can be prevented from folding away around a residual connection.
  • Another advantage of the invention is that, in contrast to conventional punching or shearing, no recess with narrow tolerances and also no hold-down device with narrow tolerances are necessary. This reduces manufacturing costs. This also results in the possibility of a compact design for the cutting device.
  • a further consequence of this is that, by means of the cutting device according to the invention, complete film sections can be produced from the film web with a reduced use of material. As a result, both a weight-reduced residual foil lattice and better handling of the same are made possible.
  • the cutting edge preferably has a star-shaped cutting contour projected at least partially in a cutting plane.
  • This geometry favors a complete cutting free of a film section because, together with the cutting edge according to the invention, it reliably completely severs the respective remaining connections at the cutting lines that essentially converge to a point, i.e. at star points or in notches in between.
  • This is not always possible with known punches, which only have a two-dimensional cutting edge with a star-shaped cutting contour, since a residual film connection can sometimes not be completely severed because the film section deviates towards the film web instead of being completely cut out. This happens above all with known punches if the cutting speed is set too low for them or their two-dimensional cutting edge is blunted.
  • the three-dimensional and star-shaped cutting edge contour on the cutting stamp in the present variant of the invention can positively influence the ability to completely cut the film material free, even if the cutting edge sharpness is low.
  • the cutting punch has a plurality of tips, which are formed both in the transverse and in the longitudinal extension of the cutting punch.
  • the cutting stamp thus has a dome-like cutting head, the tips of which taper both in the transverse extension and in the longitudinal extension of the cutting stamp.
  • One variant provides that along the cutting contour of the cutting edge the points formed in the longitudinal extent of the cutting punch correspond to the points formed in the transverse extent of the cutting punch.
  • the longitudinal points converge with the transverse points, resulting in a molded body that is easy to produce. This would result in a star-shaped cutting contour in the horizontal projection plane.
  • the respective tips can have a comparable grinding thickness or inner curvature.
  • An inner contour produced at the tips could enclose an angle of approximately 20° to 40° towards the cutting edge, for example. Even blunt cutting edges can still lead to excellent cutting results due to the varying height of the cutting contour.
  • An expedient variant provides that along the cutting contour of the cutting edge the tips formed in the longitudinal extension of the cutting stamp are formed between the tips formed in the transverse extension of the cutting stamp. Viewed in a horizontal projection plane, the cutting punch would still have a star-shaped cutting line course, as would be the case with the longitudinal and transverse points that converge as described above. However, in contrast to the above variant, there are now external transverse peaks and internal longitudinal peaks. This can be advantageous because it allows the cutting progression to be produced from the inner longitudinal tips outwards to the outer transverse tips, so that an adjacent cutting blade bordering the cutting contour on the outside can continue to cut smoothly.
  • the cutting punch has at least one indentation which, superimposed with the first concavity, forms the cutting edge.
  • the first concavity formed on the cutting punch, together with the depression on the cutting punch can produce a three-dimensional cutting contour for the cutting edge, which provides a cutting contour progressing out of the cutting plane.
  • the indentation can be cone-shaped in the longitudinal direction of the cutting punch.
  • Such a geometry is easy to manufacture and, above all, favors the shaping of the tips described above.
  • the conical indentation together with the concavity formed on the cutting punch promotes the production of a sharp cutting edge.
  • an advantageous embodiment provides that the indentation is at least partially in the form of a truncated cone with respect to a longitudinal axis of the cutting punch. In terms of production technology, this is easy to implement because a simple CNC machine can be used for this, which can produce the cutting punch in just a few steps and without multi-axis operation.
  • the cutting punch is particularly robust and wear-resistant when it is designed in one piece.
  • the cutting stamp can be produced from a single workpiece blank, in particular by means of a machining production process. It would be conceivable, for example, to manufacture the cutting stamp using a CNC milling machine.
  • the cutting die preferably has four concavities on its outside. These can be formed on the cutting punch on the circumferential side and opposite one another, so that together they form a star shape.
  • the cutting device can be used particularly advantageously on a thermoforming packaging machine which has a forming station, a sealing station, a transverse cutting station and a longitudinal cutting station in one transport direction.
  • the cutting device can be used as a tool module at the cross-cutting station in order to cut out substantially round packaging corners from a film web, consisting of sealed packaging troughs, fed to the cross-cutting station.
  • the invention also relates to a method for producing a cutting punch which is used on a cutting device for producing round packaging corners.
  • the method according to the invention provides that at least one concavity is produced on an outer side of a workpiece blank, with a depression being produced on another side of the workpiece blank in such a way that the concavity overlaps a cutting edge of the cutting punch with a transverse and forming a cutting contour running in the longitudinal extension of the cutting punch.
  • a cutting punch produced in this way has a cutting edge with a three-dimensional cutting contour which, in order to cut a substantially round film section from a film web, cuts through the latter with increasing penetration depth. This means that a reduced use of force and a complete cut-out of the foil are possible without any problems. In addition, excellently high cutting speeds can be driven with it, which means that overall the productivity of a packaging machine on which the cutting stamp is used can be increased.
  • the method according to the invention can be carried out without any problems using a single-axis CNC machine.
  • This can be a CNC milling machine that is designed without multi-axis operation.
  • a preferred variant provides that a cylindrical milling tool is used to produce the concavity and an at least partially conical, parabolic or cylindrical milling tool to produce the depression. In this way, cost-effective production can be achieved. It would even be conceivable that the concavity and the deepening are produced using the same milling tool.
  • the cutting tool for the concavity and the cutting tool for the indentation produce the cutting edge of the cutting punch by means of an at least temporarily simultaneously controlled feed movement or are used in subsequent, separate work steps. These variants can be performed using the same CNC machine.
  • the cutting punch is hardened at least along its cutting edge by means of a thermal process. Wear resistance can thus be increased.
  • thermoforming packaging machine 1 shows an intermittently operating thermoforming packaging machine 1 in a perspective view.
  • This thermoforming packaging machine 1 has a forming station 2, a sealing station 3, a cross cutting device 4 and a longitudinal cutting device 5, which are arranged in this order in a transport direction R on a machine frame 6.
  • the thermoforming packaging machine 1 has a transport chain 11, which grips the lower film 8 and transports it further in the transport direction R per main work cycle, in particular transport chains or clamp chains 11 arranged on both sides.
  • the forming station 2 is designed as a deep-drawing station, in which depressions are formed in the lower film 8 by deep-drawing, for example by means of compressed air and/or vacuum.
  • the forming station 2 can be designed in such a way that several troughs are formed next to one another in the direction perpendicular to the transport direction R.
  • a filling section 12 is provided in the transport direction R behind the forming station 2, in which the troughs formed in the lower film 8 are filled with products.
  • the sealing station 3 has a hermetically sealable chamber 3a in which the atmosphere in the troughs is released before sealing with the upper film 10, e.g. B. evacuated and / or replaced by gas flushing, with a replacement gas or with a gas mixture.
  • the upper film 10 e.g. B. evacuated and / or replaced by gas flushing, with a replacement gas or with a gas mixture.
  • the cross-cutting device 4 is designed to cut through a film web F fed into it, consisting of the lower film 8 and the upper film 10 sealed therewith, in a direction transverse to the transport direction R between adjacent troughs.
  • the cross-cutting device 4 works in such a way that the lower film 8 is not severed over the entire width, but rather is not severed at least in an edge region. This enables controlled further transport through the transport chain 11.
  • the longitudinal cutting device 5 can be designed as a knife arrangement with which the film web F, ie the lower film 8 and the upper film 10, between adjacent troughs and are severed at the lateral edge of the lower film 8 in the transport direction R, so that there are isolated packages behind the longitudinal cutting device 5 .
  • These chain guides 13 are each protected from the outside by a side panel 14 of the thermoforming packaging machine 1 and, if necessary, attached to the side panel 14 .
  • the side panel 14 can be a sheet metal part.
  • the thermoforming packaging machine 1 also has a controller 19. It has the task of controlling and monitoring the processes taking place in the thermoforming packaging machine 1.
  • a display device 20 with operating elements 21 serves to visualize or influence the process sequences in the thermoforming packaging machine 1 for or by an operator.
  • Figures 2a to 2d show a cutting device 15 leading to the cross-cutting device 4 figure 1 heard.
  • the cutting device 15 comprises a cutting tool 16 and a hold-down device 17 positioned above it Figure 2a the cutting device 15 is shown in an open position.
  • the cutting tool 16 and/or the hold-down device 17 are mounted so that they can be adjusted in height.
  • the cutting tool 16 has a plurality of cutting punches 18 spaced apart from one another.
  • the respective cutting stamps 18 are designed to cut round packaging corners from the film web F.
  • cutting blades 22 are fixed between the respective cutting punches.
  • the cutting knives 22 can cut through the film web F in a direction transverse to the transport direction R between adjacent troughs.
  • the hold-down device 17 has a die 23 corresponding to a horizontally projected geometry of the cutting stamps 18 and the cutting knives 22 positioned between them.
  • the die 23 is equipped with star-shaped openings 24 as penetration openings for the cutting die 18, in which the show the Figures 2b to 2d ,
  • the cutting die 18 can immerse in order to produce round packaging corners in the film web F.
  • cutting punches 18 mounted on the cutting tool 16 each have a cutting edge 25, which extends both in the transverse and in the longitudinal direction of the Cutting punch 18 extending cutting contour 26 forms.
  • the cutting contour 26 is thus with respect to a cutting plane E (see Figure 3a ), in which the film web F is guided, formed three-dimensionally.
  • FIG Figures 2b to 2d How the cutting punch 18 and the cutting blade 22 positioned between them work together with the die 23 formed within the hold-down device 17 is illustrated in FIG Figures 2b to 2d shown.
  • FIG 2b shows that tips 27 formed on the respective cutting punches 18 initially dip into the die 23 formed on the hold-down device 17 when the cutting device 15 closes. This ensures that during the cutting process the film web F is not cut with the entire cutting edge 25 at once (see Figure 3a ) is pierced, but rather the points 27 are initially pricked into the film web F at certain points. The tips 27 continue to cut through the film web F with increasing penetration depth until a complete star-shaped cutout (see Fig 3g ) is made. Because the tips 27 of the respective cutting stamps 18 pierce the film web F with increasing penetration depth, ie with an increasing cross section, the respective cutting edge 25 of the cutting stamps 18 can sever the film web F with a reduced cutting force.
  • Figure 2b also shows that when the cutting device 15 is closed, the tips 27 of the cutting stamps 18 first cut the round packaging corners out of the film web F.
  • the cutting blades 22 positioned between the cutting punches 18 penetrate through the die 23 formed in the hold-down device 17, as a result of which cross-sections are produced between the round, already cut-out packaging corners.
  • the outer cutting stamps 18 shown on the cutting tool 16 have a blade 28, by means of which the film web F can be severed on its outer sides.
  • the Figures 2a to 2d show that the respective cutting dies 18 have a dome-like cutting head.
  • the cutting punch 18 with little effort pierce the tips 27 into the film web F ahead of time, resulting in a cutting path that draws into the film web F.
  • the result of this is that small tensions form within the film web F during the cutting process, which enables the film to be cut out more precisely.
  • the Figures 3a to 3g show how the cutting stamp 18 penetrates further and further with its cutting edge 25 into the film web F with increasing penetration depth.
  • the foil web F is in Figure 3a positioned within the cutting plane E. In this cutting plane E, the film web F is held in reserve for the cutting process between the cutting tool 16 and the hold-down device 17 positioned above it.
  • Figure 3a shows that the cutting stamp 18 already punctuates the film web F with its tips 27 in a punctiform manner. The tips 27 can penetrate into the film web F with comparatively little effort.
  • the Figure 3a shows that the cutting edge 25 of the cutting die 18 between the tips 27 is mostly still positioned below the film web F. As the cutting stamp 18 penetrates the film web F more and more, the cutting edge 25 cuts through the film web F more and more, resulting in a complete cutout. This is what they show Figures 3b to 3g .
  • a recess 29 is formed in the cutting punch 18 off Figure 3a .
  • the indentation 29 forms the curved cutting edge 25 together with a concavity 30 formed circumferentially on the cutting punch 18 .
  • the recess 29 is cone-shaped.
  • a conical milling tool could be used to produce the depression 29 so that the depression 29 is at least partially in the form of a truncated cone with respect to a longitudinal axis of the cutting punch 18 .
  • concavities 30 formed on the outside of the cutting die 18 form, together with the depression 29, a dome-like cutting head from the tips 27 of which pierce the film web F like knife tips during the cutting process.
  • the concavities 30 can be produced using a cylindrical milling tool.
  • Figure 3b shows the peaks 27 compared to Figure 3a with increasing penetration depth.
  • the cutting edge 25 when the cutting punch 18 moves into the die 23 continues to cut through the film web F.
  • the cutting edge 25, which is increasingly pulled through the film web F runs like a knife through the film web F through to Figure 3g the tips 27 are positioned completely above the film web F, with which the round package corners are completely cut out.
  • figure 4 shows a cutting punch 18' according to the embodiment in different views.
  • the cutting punch 18' from figure 4 has a cutting edge 25', which provides tips 27' formed in the longitudinal extension of the cutting punch 18', which lie between tips 27" formed in the transverse extension of the cutting punch 18'.
  • the cutting punch 18' thus has, viewed in a horizontal projection plane, the figure 4 Star shape shown, ie a star-shaped cutting line course, as it also means in the Figures 3a to 3g shown punch 18 can be produced.
  • the cutting punch 18, 18' used in the invention has a cutting edge 25, 25' with a three-dimensional cutting contour 26, 26', which can be used to produce a cutting path that gradually moves along with increasing penetration depth, so that the cross-cutting device 4 can work with comparatively low cutting forces. to produce round packaging corners.
  • the three-dimensional, curved cutting contour 26, 26' can be used to prevent the film sections produced from folding away, so that a precise section is made possible overall.
  • a cutting punch 18, 18' used according to the invention on the cutting device 15 can be produced inexpensively using a milling machine with single-axis operation.
  • the cutting stamps 18, 18' according to the invention improve the precise separation of packaging from the film web F, can be produced economically as such and enable efficient operation of the cross-cutting device 4.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Forests & Forestry (AREA)
  • Perforating, Stamping-Out Or Severing By Means Other Than Cutting (AREA)
  • Containers And Plastic Fillers For Packaging (AREA)
  • Auxiliary Devices For And Details Of Packaging Control (AREA)

Abstract

Die Erfindung betrifft eine Schneideinrichtung (15), die zum Zuschneiden von im Wesentlichen runden Verpackungsecken aus einer Folienbahn (F) ausgebildet ist, wobei die Schneideinrichtung (15) mindestens ein Schneidwerkzeug (16) aufweist, dass einen Schneidstempel (18, 18') umfasst, der an seiner Außenseite mindestens eine Konkavität (30) aufweist, die zum Ausbilden einer Schneidkante (25) des Schneidstempels (18, 18') vorgesehen ist. Erfindungsgemäß weist die Schneidkante (25) eine sich sowohl in Quer- als auch in Längserstreckung des Schneidstempels (18, 18') verlaufende Schneidkontur (26, 26') auf. Die Erfindung bezieht sich ferner auf ein Verfahren zur Herstellung eines Schneidstempels (18).The invention relates to a cutting device (15) which is designed to cut substantially round packaging corners from a film web (F), the cutting device (15) having at least one cutting tool (16) which includes a cutting die (18, 18'). , which has at least one concavity (30) on its outside, which is provided for forming a cutting edge (25) of the cutting punch (18, 18'). According to the invention, the cutting edge (25) has a cutting contour (26, 26') running both in the transverse and in the longitudinal extension of the cutting punch (18, 18'). The invention also relates to a method for producing a cutting die (18).

Description

Die vorliegende Erfindung betrifft eine Schneideinrichtung gemäß dem Anspruch 1 sowie ein Verfahren zum Herstellen eines Schneidstempels gemäß dem Anspruch 12.The present invention relates to a cutting device according to claim 1 and a method for producing a cutting punch according to claim 12.

Eine Schneideinrichtung zum Stanzen runder Verpackungsecken ist aus der DE 202 16 772 U1 bekannt. An dieser Schneideinrichtung werden sternförmige Schnittstempel eingesetzt, die zusammen mit dementsprechend sternförmig ausgebildeten Aussparungen als Stanzwerkzeug vorliegen. Beim Stanzvorgang wird die Kontur der auszustanzenden Form gleichzeitig von oben und von unten von den Schneidkanten der Aussparungen und der Schnittstempel eingekerbt und schließlich abgeschert. Der Schnittstempel weist eine zweidimensionale Schneidkontur auf, die der auszustanzenden Form entspricht.A cutter for punching round packaging corners is from DE 202 16 772 U1 famous. Star-shaped cutting punches are used on this cutting device, which are present together with correspondingly star-shaped recesses as a punching tool. During the punching process, the contour of the shape to be punched out is simultaneously notched from above and below by the cutting edges of the recesses and the cutting punches and finally sheared off. The cutting punch has a two-dimensional cutting contour that corresponds to the shape to be punched out.

EP 3 109 017 B1 offenbart eine Tiefziehverpackungsmaschine, deren Querschneideeinrichtung als Folienstanze ausgebildet ist, um eine Folienbahn in einer Richtung quer zur Transportrichtung zwischen benachbarten Mulden zu durchtrennen. EP 3 109 017 B1 discloses a thermoforming packaging machine whose cross-cutting device is designed as a film punch in order to sever a film web in a direction transverse to the transport direction between adjacent troughs.

Gemäß den vorangehenden Veröffentlichungen werden Verpackungen, insbesondere runde Verpackungsecken, bislang gestanzt oder mittels Quetschschnitts hergestellt. Problematisch ist, dass bei der Herstellung von Stanzwerkzeugen aufgrund deren hoher Fertigungsgenauigkeit hohe Herstellungskosten entstehen. Außerdem ergeben sich durch den Betrieb von Stanzwerkzeugen äußerst hohe Stanzkräfte, die mittels einer aufwändigen Konstruktion aufgenommen werden müssen. Damit einher geht ebenfalls ein erhöhter Energieverbrauch an der Verpackungsmaschine. Hinzu kommt, dass beim Stanzvorgang eine erhebliche Menge an Abfallmaterial anfallen kann, das beispielsweise in Form eines Restgitters vorliegt, welches am Ausgang einer Tiefziehverpackungsmaschine mit einem relativ großen Volumen aufgewickelt und anschließend kostenintensiv entsorgt werden muss. Ferner kann beim Ausstanzen von kompletten Folienausschnitten aufgrund des komplexen Aufbaus sowie der Geometrie von Stanzwerkzeugen ein erhöhter Folienverbrauch entstehen.According to the previous publications, packaging, in particular round packaging corners, has hitherto been punched or produced by means of crush cutting. The problem is that high production costs arise in the production of stamping tools due to their high manufacturing accuracy. In addition, extremely high punching forces result from the operation of punching tools, which have to be absorbed by means of a complex construction. This is also accompanied by increased energy consumption on the packaging machine. In addition, the punching process can produce a significant amount of waste material, which is present, for example, in the form of a residual skeleton, which has to be wound up at the exit of a thermoforming packaging machine with a relatively large volume and then has to be disposed of at high cost. Furthermore, when punching out complete foil sections, increased foil consumption can occur due to the complex structure and the geometry of the punching tools.

Der Erfindung liegt die Aufgabe zugrunde, eine Schneideinrichtung sowie ein Verfahren zur Herstellung eines Schneidstempels zur Verfügung zu stellen, wodurch sich voranstehende, in Zusammenhang mit dem Stand der Technik beschriebene Nachteile zumindest reduzieren lassen.The invention is based on the object of providing a cutting device and a method for producing a cutting punch, as a result of which the above disadvantages described in connection with the prior art can at least be reduced.

Diese Aufgabe wird gelöst mittels einer Schneideinrichtung gemäß dem Anspruch 1 sowie anhand eines Verfahrens zur Herstellung eines Schneidstempels gemäß dem Anspruch 12.This object is achieved by means of a cutting device according to claim 1 and by means of a method for producing a cutting punch according to claim 12.

Vorteilhafte Weiterbildungen der Erfindung sind durch die jeweiligen Gegenstände der Unteransprüche gegeben.Advantageous developments of the invention are given by the respective objects of the dependent claims.

Die Erfindung betrifft eine Schneideinrichtung, die zum Zuschneiden von im Wesentlichen runden Verpackungsecken aus einer Folienbahn ausgebildet ist, wobei die Schneideinrichtung mindestens ein Schneidwerkzeug aufweist, das einen Schneidstempel umfasst, der an seiner Außenseite mindestens eine Konkavität aufweist, die zum Ausbilden einer Schneidkante des Schneidstempels vorgesehen ist.The invention relates to a cutting device that is designed to cut substantially round packaging corners from a film web, the cutting device having at least one cutting tool that includes a cutting punch that has at least one concavity on its outside that is provided for forming a cutting edge of the cutting punch is.

Erfindungsgemäß weist die Schneidkante eine sich sowohl in Quer- als auch in Längserstreckung des Schneidstempels verlaufende Schneidkontur auf. Damit verläuft die Schneidkontur dreidimensional am Körper des Schneidstempels, d.h. nicht nur wie bei bekannten Stanzstempeln zweidimensional parallel zur Schnittebene. Die erfindungsgemäße Schneidkante durchtrennt die Folienbahn mit zunehmender Eindringtiefe immer weiter (d.h. in der Schnitt- oder Folienebene voranschreitend), bis der Folienschnitt vollständig hergestellt ist. Die Schneidkante kann dabei mittels vergleichsweise geringer Schneidkräfte durch die Folienbahn gezogen werden.According to the invention, the cutting edge has a cutting contour that runs both in the transverse and in the longitudinal extension of the cutting punch. The cutting contour thus runs three-dimensionally on the body of the cutting punch, i.e. not just two-dimensionally parallel to the cutting plane, as is the case with known punching punches. The cutting edge according to the invention continues to cut through the film web with increasing penetration depth (i.e. advancing in the cutting or film plane) until the film cut is completely made. The cutting edge can be pulled through the film web by means of comparatively low cutting forces.

Insbesondere weist die Schneidkante im befestigten Zustand des Schneidstempels an der Schneideinrichtung sowohl in horizontaler als auch in vertikaler Projektionsebene betrachtet eine kurvenförmige Schneidkontur auf. Demzufolge unterscheidet sich die bei der Erfindung eingesetzte Schneidkante von Schneidkanten, wie sie typischerweise an Schneidstempeln von Stanzwerkzeugen ausgebildet sind, durch eine Schneidkontur, deren Verlauf von der auszuschneidenden Folienform abweicht. Dies gestattet es der erfindungsgemäßen Schneidkante, dass sie beim Schneidvorgang nicht mit der gesamten Schneidkante auf einmal die Folienbahn durchstößt, sondern z.B. zunächst gewissermaßen punktförmig, und mit zunehmender Eindringtiefe entlang deren Schneidkontur die Folienbahn zieht und diese durchtrennt.In particular, when the cutting punch is in the fastened state on the cutting device, the cutting edge has a curved cutting contour when viewed both in the horizontal and in the vertical plane of projection. Consequently, the cutting edge used in the invention differs from cutting edges, such as are typically formed on cutting dies of punching tools, by a cutting contour whose profile deviates from the film shape to be cut out. This allows the cutting edge according to the invention not to pierce the film web with the entire cutting edge at once during the cutting process, but instead initially to a certain extent in a punctiform manner and, with increasing penetration depth, pulls the film web along its cutting contour and severs it.

Die erfindungsgemäße Schneidkante begünstigt in anderen Worten einen entlang ihrer dreidimensionalen Schneidkontur zunehmend in der Schnitt- oder Folienebene voranschreitenden Schnittverlauf, der einerseits zum Steigern der Produktivität problemlos mit einer hohen Schneidgeschwindigkeit durchgeführt werden kann sowie andererseits im Vergleich zu bekannten abrupten Stanzverfahren mit geringeren Schneidkräften auskommt. Insgesamt kann dadurch auch die Energiebilanz der Schneideinrichtung deutlich verbessert werden. Mittels des durch die Erfindung ermöglichten, sich allmählich entlang der Schneidkante fortsetzenden Schnittverlaufs lassen sich auch Folienausschnitte jeglicher Form besser komplett freischneiden, weil dabei ein Wegklappen der Folienausschnitte um eine Restverbindung verhindert werden kann.In other words, the cutting edge according to the invention promotes a cutting progression along its three-dimensional cutting contour that increasingly progresses in the cutting or foil plane, which can be carried out without any problems at a high cutting speed to increase productivity and on the other hand requires lower cutting forces compared to known abrupt punching processes. Overall, the energy balance of the cutting device can also be significantly improved as a result. By means of the made possible by the invention, gradually continuing along the cutting edge In the course of the cut, film sections of any shape can also be better completely cut free, because the film sections can be prevented from folding away around a residual connection.

Vorteilhaft bei der Erfindung ist auch, dass im Gegensatz zum herkömmlichen Stanzen bzw. Scherschneiden keine eng tolerierte Aussparung und auch kein eng tolerierter Niederhalter notwendig sind. Dies verringert die Herstellungskosten. Dadurch ergibt sich für die Schneideinrichtung auch die Möglichkeit einer kompakten Bauweise. Dies hat ferner zur Folge, dass mittels der erfindungsgemäßen Schneideinrichtung komplette Folienausschnitte mit einem reduzierten Materialeinsatz aus der Folienbahn herstellbar sind. Infolgedessen werden sowohl ein gewichtreduziertes Restfoliengitter als auch eine bessere Handhabung desselben ermöglicht.Another advantage of the invention is that, in contrast to conventional punching or shearing, no recess with narrow tolerances and also no hold-down device with narrow tolerances are necessary. This reduces manufacturing costs. This also results in the possibility of a compact design for the cutting device. A further consequence of this is that, by means of the cutting device according to the invention, complete film sections can be produced from the film web with a reduced use of material. As a result, both a weight-reduced residual foil lattice and better handling of the same are made possible.

Vorzugsweise weist die Schneidkante in einer Schneidebene projiziert zumindest teilweise eine sternförmig ausgebildete Schneidkontur auf. Diese Geometrie begünstigt ein komplettes Freischneiden eines Folienausschnitts, weil sie zusammen mit der erfindungsgemäßen Schneidkante jeweilige Restverbindungen zuverlässig an den daran im Wesentlichen spitz aufeinander zulaufenden Schnittlinien, d.h. an Sternspitzen oder in dazwischenliegenden Kerben, vollständig durchtrennt. Dies ist bei bekannten Stanzstempeln, an welchen lediglich eine zweidimensionale Schneidkante mit einer sternförmigen Schneidkontur vorliegt, nicht immer einwandfrei möglich, da eine Folienrestverbindung manchmal nicht vollständig durchtrennt werden kann, weil der Folienausschnitt zur Folienbahn hin ausweicht, anstatt fertig ausgeschnitten zu werden. Dies passiert vor allem dann bei bekannten Stanzstempeln, wenn für sie die Schneidgeschwindigkeit zu gering eingestellt oder deren zweidimensionale Schneidkante abgestumpft ist. Die bei der vorliegenden Erfindungsvariante am Schneidstempel sowohl dreidimensional als auch sternförmig ausgebildete Schneidkantenkontur kann dagegen die Fähigkeit eines vollständigen Freischneidens des Folienmaterials positiv beeinflussen, sogar dann, wenn eine geringe Schneidkantenschärfe vorliegt.The cutting edge preferably has a star-shaped cutting contour projected at least partially in a cutting plane. This geometry favors a complete cutting free of a film section because, together with the cutting edge according to the invention, it reliably completely severs the respective remaining connections at the cutting lines that essentially converge to a point, i.e. at star points or in notches in between. This is not always possible with known punches, which only have a two-dimensional cutting edge with a star-shaped cutting contour, since a residual film connection can sometimes not be completely severed because the film section deviates towards the film web instead of being completely cut out. This happens above all with known punches if the cutting speed is set too low for them or their two-dimensional cutting edge is blunted. In contrast, the three-dimensional and star-shaped cutting edge contour on the cutting stamp in the present variant of the invention can positively influence the ability to completely cut the film material free, even if the cutting edge sharpness is low.

Eine bevorzugte Ausführungsform sieht vor, dass der Schneidstempel mehrere Spitzen aufweist, die sowohl in Quer- als auch in Längserstreckung des Schneidstempels ausgebildet sind. Der Schneidstempel weist damit einen domartigen Schneidkopf auf, dessen Spitzen sich sowohl in Quererstreckung als auch in Längserstreckung des Schneidstempels verjüngen. Damit kann der Schneidstempel unter geringem Kraftaufwand mit den Spitzen voraus, zunehmend in die Folienbahn einstechen, um mittels des vorangehend beschriebenen, zunehmend durch die Folienbahn ziehenden Schneidverlaufs einen vollständigen Folienausschnitt freizuschneiden. Aufgrund der Spitzen kann der Schneidstempel mit zunehmendem Querschnitt in die Folienbahn eintauchen. Dies hat zur Folge, dass unter reduziertem Kraftaufwand jeweilige Flanken der Spitzen bis in die dazwischenliegenden Kerben in die Folienbahn eintauchen, wodurch innerhalb der Folienbahn geringe Spannungen entstehen, was einen präzisen Folienausschnitt begünstigt.A preferred embodiment provides that the cutting punch has a plurality of tips, which are formed both in the transverse and in the longitudinal extension of the cutting punch. The cutting stamp thus has a dome-like cutting head, the tips of which taper both in the transverse extension and in the longitudinal extension of the cutting stamp. This means that the cutting die can increasingly pierce the film web with its tips in front with little effort, and by means of the above-described, increasingly to cut free a complete section of the film through the cutting process that pulls the film web. Because of the tips, the cutting stamp can dip into the film web as the cross-section increases. The consequence of this is that, with reduced effort, the respective flanks of the tips dip into the film web up to the notches in between, as a result of which low tensions arise within the film web, which promotes a precise film cut-out.

Eine Variante sieht vor, dass entlang der Schneidkontur der Schneidkante die in Längserstreckung des Schneidstempels ausgebildeten Spitzen den in Quererstreckung des Schneidstempels ausgebildeten Spitzen entsprechen. Dabei laufen die Längs- mit den Querspitzen zusammen, sodass ein einfach herstellbarer Formkörper vorliegt. In horizontaler Projektionsebene ergäbe sich hiermit eine sternförmige Schneidkontur.One variant provides that along the cutting contour of the cutting edge the points formed in the longitudinal extent of the cutting punch correspond to the points formed in the transverse extent of the cutting punch. In this case, the longitudinal points converge with the transverse points, resulting in a molded body that is easy to produce. This would result in a star-shaped cutting contour in the horizontal projection plane.

Die jeweiligen Spitzen können gemäß einer Ausführungsform eine vergleichbare Ausschliffstärke bzw. Innenwölbung haben. Eine an den Spitzen erzeugte Innenkontur könnte beispielsweise zur Schneidkante hin einen Winkel von ungefähr 20° bis 40° einschließen. Selbst stumpfer geformte Schneidkanten können aufgrund des variierenden Höhenverlaufs der Schneidkontur immer noch zu hervorragenden Schneidresultaten führen.According to one embodiment, the respective tips can have a comparable grinding thickness or inner curvature. An inner contour produced at the tips could enclose an angle of approximately 20° to 40° towards the cutting edge, for example. Even blunt cutting edges can still lead to excellent cutting results due to the varying height of the cutting contour.

Eine zweckmäßige Variante sieht vor, dass entlang der Schneidkontur der Schneidkante die in Längserstreckung des Schneidstempels ausgebildeten Spitzen zwischen den in Quererstreckung des Schneidstempels ausgebildeten Spitzen ausgebildet sind. Der Schneidstempel würde damit in einer horizontalen Projektionsebene betrachtet immer noch einen sternförmigen Schnittlinienverlauf aufweisen, wie er bei den oben beschriebenen zusammenlaufenden Längs- und Querspitzen zustande käme. Allerdings liegen jetzt im Gegensatz zur obigen Variante außenliegende Querspitzen und innenliegende Längsspitzen vor. Dies kann vorteilhaft sein, weil dadurch der Schneidverlauf von den innenliegenden Längsspitzen aus nach außen zu den außenliegenden Querspitzen hin erzeugt werden kann, sodass ein außen an der Schneidkontur angrenzendes, benachbartes Schneidmesser direkt daran anschließend, fließend weiterschneiden kann.An expedient variant provides that along the cutting contour of the cutting edge the tips formed in the longitudinal extension of the cutting stamp are formed between the tips formed in the transverse extension of the cutting stamp. Viewed in a horizontal projection plane, the cutting punch would still have a star-shaped cutting line course, as would be the case with the longitudinal and transverse points that converge as described above. However, in contrast to the above variant, there are now external transverse peaks and internal longitudinal peaks. This can be advantageous because it allows the cutting progression to be produced from the inner longitudinal tips outwards to the outer transverse tips, so that an adjacent cutting blade bordering the cutting contour on the outside can continue to cut smoothly.

Vorteilhaft ist es, wenn der Schneidstempel mindestens eine Vertiefung aufweist, die mit der ersten Konkavität überlagert die Schneidkante ausbildet. Somit kann die am Schneidstempel ausgebildete erste Konkavität zusammen mit der Vertiefung am Schneidstempel eine dreidimensionale Schneidkontur für die Schneidkante erzeugen, die einen aus der Schnittebene herausgehenden Schneidkonturverlauf vorsieht.It is advantageous if the cutting punch has at least one indentation which, superimposed with the first concavity, forms the cutting edge. Thus, the first concavity formed on the cutting punch, together with the depression on the cutting punch, can produce a three-dimensional cutting contour for the cutting edge, which provides a cutting contour progressing out of the cutting plane.

Insbesondere kann die Vertiefung in Längsrichtung des Schneidstempels konusförmig ausgebildet sein. Eine solche Geometrie ist einfach herstellbar und begünstigt vor allem das Formen der vorangehend beschriebenen Spitzen. Hinzu kommt, dass die konische Vertiefung zusammen mit der am Schneidstempel ausgebildeten Konkavität die Herstellung einer scharfen Schneidkante begünstigt.In particular, the indentation can be cone-shaped in the longitudinal direction of the cutting punch. Such a geometry is easy to manufacture and, above all, favors the shaping of the tips described above. In addition, the conical indentation together with the concavity formed on the cutting punch promotes the production of a sharp cutting edge.

Eine vorteilhafte Ausführungsform sieht vor, dass die Vertiefung hinsichtlich einer Längsachse des Schneidstempels zumindest teilweise in Form eines Kegelstumpfs vorliegt. Herstellungstechnisch ist dies einfach zu realisieren, weil hierfür eine einfache CNC-Maschine eingesetzt werden kann, die anhand weniger Schritte und ohne Mehrachsbetrieb den Schneidstempel herstellen kann.An advantageous embodiment provides that the indentation is at least partially in the form of a truncated cone with respect to a longitudinal axis of the cutting punch. In terms of production technology, this is easy to implement because a simple CNC machine can be used for this, which can produce the cutting punch in just a few steps and without multi-axis operation.

Besonders robust und verschleißarm ist der Schneidstempel dann, wenn er einteilig ausgebildet ist. Der Schneidstempel kann insbesondere mittels eines spanenden Fertigungsverfahrens aus einem einzigen Werkstückrohling hergestellt sein. Vorstellbar wäre bspw. die Herstellung des Schneidstempels mittels einer CNC-Fräsmaschine.The cutting punch is particularly robust and wear-resistant when it is designed in one piece. The cutting stamp can be produced from a single workpiece blank, in particular by means of a machining production process. It would be conceivable, for example, to manufacture the cutting stamp using a CNC milling machine.

Vorzugsweise weist der Schneidstempel an dessen Außenseite vier Konkavitäten auf. Diese können am Schneidstempel umfangseitig und gegenüberliegend ausgebildet sein, sodass sie zusammen eine Sternenform ausbilden.The cutting die preferably has four concavities on its outside. These can be formed on the cutting punch on the circumferential side and opposite one another, so that together they form a star shape.

Besonders vorteilhaft kann die Schneideinrichtung an einer Tiefziehverpackungsmaschine zum Einsatz kommen, die in einer Transportrichtung eine Formstation, eine Siegelstation, eine Querschneidestation und eine Längsschneidestation aufweist. An der Tiefziehverpackungsmaschine kann die Schneideeinrichtung als Werkzeugmodul an der Querschneidestation eingesetzt werden, um im Wesentlichen runde Verpackungsecken aus einer der Querschneidestation zugeführten Folienbahn, bestehend aus versiegelten Verpackungsmulden, auszuschneiden.The cutting device can be used particularly advantageously on a thermoforming packaging machine which has a forming station, a sealing station, a transverse cutting station and a longitudinal cutting station in one transport direction. On the thermoforming packaging machine, the cutting device can be used as a tool module at the cross-cutting station in order to cut out substantially round packaging corners from a film web, consisting of sealed packaging troughs, fed to the cross-cutting station.

Die Erfindung bezieht sich auch auf ein Verfahren zur Herstellung eines Schneidstempels, der an einer Schneideinrichtung zum Herstellen runder Verpackungsecken zum Einsatz kommt. Das erfindungsgemäße Verfahren sieht vor, dass an einer Außenseite eines Werkstückrohlings mindestens eine Konkavität hergestellt wird, wobei an einer anderen Seite des Werkstückrohlings eine Vertiefung derart hergestellt wird, dass diese mit der Konkavität überlagert eine Schneidkante des Schneidstempels mit einer sich sowohl in Quer- als auch in Längserstreckung des Schneidstempels verlaufenden Schneidkontur ausbildet.The invention also relates to a method for producing a cutting punch which is used on a cutting device for producing round packaging corners. The method according to the invention provides that at least one concavity is produced on an outer side of a workpiece blank, with a depression being produced on another side of the workpiece blank in such a way that the concavity overlaps a cutting edge of the cutting punch with a transverse and forming a cutting contour running in the longitudinal extension of the cutting punch.

Ein derartig hergestellter Schneidstempel besitzt eine Schneidkante mit einer dreidimensionalen Schneidkontur, die zum Zuschneiden eines im Wesentlichen runden Folienausschnitts aus einer Folienbahn diese mit zunehmender Eindringtiefe durchtrennt. Dadurch sind ein reduzierter Krafteinsatz sowie ein vollständiger Folienausschnitt problemlos möglich. Außerdem können damit hervorragend hohe Schneidgeschwindigkeiten gefahren werden, wodurch insgesamt die Produktivität an einer Verpackungsmaschine, an welcher der Schneidstempel eingesetzt wird, erhöht werden kann.A cutting punch produced in this way has a cutting edge with a three-dimensional cutting contour which, in order to cut a substantially round film section from a film web, cuts through the latter with increasing penetration depth. This means that a reduced use of force and a complete cut-out of the foil are possible without any problems. In addition, excellently high cutting speeds can be driven with it, which means that overall the productivity of a packaging machine on which the cutting stamp is used can be increased.

Das erfindungsgemäße Verfahren lässt sich problemlos mittels einer einachsigen CNC-Maschine durchführen. Dabei kann es sich um eine CNC-Fräsmaschine handeln, die ohne Mehrachsbetrieb ausgebildet ist.The method according to the invention can be carried out without any problems using a single-axis CNC machine. This can be a CNC milling machine that is designed without multi-axis operation.

Eine bevorzugte Variante sieht vor, dass zur Herstellung der Konkavität ein zylindrisches und zur Herstellung der Vertiefung ein zumindest teilweise konisches, parabelförmiges oder zylindrisches Fräswerkzeug eingesetzt werden. Damit kann eine kostengünstige Herstellung erreicht werden. Vorstellbar wäre es sogar, dass die Konkavität und die Vertiefung mittels desselben Fräswerkzeugs hergestellt werden.A preferred variant provides that a cylindrical milling tool is used to produce the concavity and an at least partially conical, parabolic or cylindrical milling tool to produce the depression. In this way, cost-effective production can be achieved. It would even be conceivable that the concavity and the deepening are produced using the same milling tool.

Gemäß einer Ausführungsform stellen das Schneidwerkzeug für die Konkavität und das Schneidwerkzeug für die Vertiefung mittels einer zumindest temporär zeitgleich gesteuerten Vorschubbewegung die Schneidkante des Schneidstempels her oder kommen in nacheinander folgenden, gesonderten Arbeitsschritten zum Einsatz. Diese Varianten können mittels derselben CNC-Maschine durchgeführt werden.According to one embodiment, the cutting tool for the concavity and the cutting tool for the indentation produce the cutting edge of the cutting punch by means of an at least temporarily simultaneously controlled feed movement or are used in subsequent, separate work steps. These variants can be performed using the same CNC machine.

Vorteilhaft ist es, wenn der Schneidstempel zumindest entlang dessen Schneidkante mittels eines thermischen Verfahrens ausgehärtet wird. Ein Verschleißwiderstand kann damit erhöht werden.It is advantageous if the cutting punch is hardened at least along its cutting edge by means of a thermal process. Wear resistance can thus be increased.

Im Folgenden werden vorteilhafte Ausführungsbeispiele der Erfindung anhand von Zeichnungen näher erläutert. Im Einzelnen zeigen:

Figur 1
eine perspektivische Ansicht einer Tiefziehverpackungsmaschine,
Figuren 2a bis 2d
eine erfindungsgemäße Schneideinrichtung während verschiedener Betriebsphasen,
Figuren 3a bis 3g
einen Schneidstempel der erfindungsgemäßen Schneideinrichtung beim Durchtrennen einer Folienbahn, und
Figur 4
einen Schneidstempel mit dreidimensionaler Schneidkontur gemäß einer Variante.
In the following, advantageous exemplary embodiments of the invention are explained in more detail with reference to drawings. Show in detail:
figure 1
a perspective view of a thermoforming packaging machine,
Figures 2a to 2d
a cutting device according to the invention during various operating phases,
Figures 3a to 3g
a cutting punch of the cutting device according to the invention when cutting through a film web, and
figure 4
a cutting punch with a three-dimensional cutting contour according to a variant.

Gleiche Komponenten sind in den Figuren durchgängig mit gleichen Bezugszeichen versehen.Identical components are provided with the same reference symbols throughout the figures.

Figur 1 zeigt in einer perspektivischen Ansicht eine intermittierend arbeitende Tiefziehverpackungsmaschine 1. Diese Tiefziehverpackungsmaschine 1 weist eine Formstation 2, eine Siegelstation 3, eine Querschneideeinrichtung 4 und eine Längsschneideeinrichtung 5 auf, die in dieser Reihenfolge in einer Transportrichtung R an einem Maschinengestell 6 angeordnet sind. Eingangsseitig befindet sich an dem Maschinengestell 6 eine Zufuhrrolle 7, von der eine Unterfolie 8 abgezogen wird. Ferner weist die Tiefziehverpackungsmaschine 1 eine Transportkette 11 auf, die die Unterfolie 8 ergreift und diese pro Hauptarbeitstakt in der Transportrichtung R weitertransportiert, insbesondere beidseitig angeordnete Transportketten bzw. Klammerketten 11. figure 1 shows an intermittently operating thermoforming packaging machine 1 in a perspective view. This thermoforming packaging machine 1 has a forming station 2, a sealing station 3, a cross cutting device 4 and a longitudinal cutting device 5, which are arranged in this order in a transport direction R on a machine frame 6. On the input side there is a feed roll 7 on the machine frame 6, from which a lower film 8 is drawn off. Furthermore, the thermoforming packaging machine 1 has a transport chain 11, which grips the lower film 8 and transports it further in the transport direction R per main work cycle, in particular transport chains or clamp chains 11 arranged on both sides.

In der dargestellten Ausführungsform ist die Formstation 2 als eine Tiefziehstation ausgebildet, bei der in die Unterfolie 8 durch Tiefziehen, bspw. mittels Druckluft und/oder Vakuum, Mulden geformt werden. Dabei kann die Formstation 2 derart ausgebildet sein, dass in der Richtung senkrecht zur Transportrichtung R mehrere Mulden nebeneinander gebildet werden. In Transportrichtung R hinter der Formstation 2 ist eine Einfüllstrecke 12 vorgesehen, in der die in der Unterfolie 8 geformten Mulden mit Produkten befüllt werden.In the embodiment shown, the forming station 2 is designed as a deep-drawing station, in which depressions are formed in the lower film 8 by deep-drawing, for example by means of compressed air and/or vacuum. The forming station 2 can be designed in such a way that several troughs are formed next to one another in the direction perpendicular to the transport direction R. A filling section 12 is provided in the transport direction R behind the forming station 2, in which the troughs formed in the lower film 8 are filled with products.

Die Siegelstation 3 verfügt über eine hermetisch verschließbare Kammer 3a, in der die Atmosphäre in den Mulden vor dem Versiegeln mit der von einer Oberfolienaufnahme 9 abgegebenen Oberfolie 10, z. B. evakuiert und/oder durch Gasspülen, mit einem Austauschgas oder mit einem Gasgemisch ersetzt werden kann.The sealing station 3 has a hermetically sealable chamber 3a in which the atmosphere in the troughs is released before sealing with the upper film 10, e.g. B. evacuated and / or replaced by gas flushing, with a replacement gas or with a gas mixture.

Die Querschneideeinrichtung 4 ist dazu ausgebildet, eine in sie hineingeführte Folienbahn F, bestehend aus der Unterfolie 8 und damit versiegelten Oberfolie 10, in einer Richtung quer zur Transportrichtung R zwischen benachbarten Mulden zu durchtrennen. Dabei arbeitet die Querschneideeinrichtung 4 derart, dass die Unterfolie 8 nicht über die gesamte Breite aufgetrennt wird, sondern zumindest in einem Randbereich nicht durchtrennt wird. Dies ermöglicht einen kontrollierten Weitertransport durch die Transportkette 11.The cross-cutting device 4 is designed to cut through a film web F fed into it, consisting of the lower film 8 and the upper film 10 sealed therewith, in a direction transverse to the transport direction R between adjacent troughs. The cross-cutting device 4 works in such a way that the lower film 8 is not severed over the entire width, but rather is not severed at least in an edge region. This enables controlled further transport through the transport chain 11.

Die Längsschneideeinrichtung 5 kann als eine Messeranordnung ausgebildet sein, mit der die Folienbahn F, d.h. die Unterfolie 8 und die Oberfolie 10, zwischen benachbarten Mulden und am seitlichen Rand der Unterfolie 8 in der Transportrichtung R durchtrennt werden, sodass hinter der Längsschneideeinrichtung 5 vereinzelte Verpackungen vorliegen.The longitudinal cutting device 5 can be designed as a knife arrangement with which the film web F, ie the lower film 8 and the upper film 10, between adjacent troughs and are severed at the lateral edge of the lower film 8 in the transport direction R, so that there are isolated packages behind the longitudinal cutting device 5 .

Die rechten und linken Transportketten 11 der Tiefziehverpackungsmaschine 1, die die Unterfolie 8 beidseitig ergreifen, werden jeweils in einer Kettenführung 13 geführt. Diese Kettenführungen 13 sind nach außen hin jeweils von einer Seitenverkleidung 14 der Tiefziehverpackungsmaschine 1 geschützt und ggf. an der Seitenverkleidung 14 befestigt. Die Seitenverkleidung 14 kann ein Blechteil sein.The right and left transport chains 11 of the thermoforming packaging machine 1, which grip the lower film 8 on both sides, are each guided in a chain guide 13. These chain guides 13 are each protected from the outside by a side panel 14 of the thermoforming packaging machine 1 and, if necessary, attached to the side panel 14 . The side panel 14 can be a sheet metal part.

Die Tiefziehverpackungsmaschine 1 verfügt ferner über eine Steuerung 19. Sie hat die Aufgabe, die in der Tiefziehverpackungsmaschine 1 ablaufenden Prozesse zu steuern und zu überwachen. Eine Anzeigevorrichtung 20 mit Bedienelementen 21 dient zum Visualisieren bzw. Beeinflussen der Prozessabläufe in der Tiefziehverpackungsmaschine 1 für bzw. durch einen Bediener.The thermoforming packaging machine 1 also has a controller 19. It has the task of controlling and monitoring the processes taking place in the thermoforming packaging machine 1. A display device 20 with operating elements 21 serves to visualize or influence the process sequences in the thermoforming packaging machine 1 for or by an operator.

Die Figuren 2a bis 2d zeigen eine Schneideinrichtung 15, die zur Querschneideeinrichtung 4 aus Figur 1 gehört.the Figures 2a to 2d show a cutting device 15 leading to the cross-cutting device 4 figure 1 heard.

Die Schneideinrichtung 15 umfasst ein Schneidwerkzeug 16 sowie einen darüber positionierten Niederhalter 17. In Figur 2a ist die Schneideinrichtung 15 in einer geöffneten Stellung dargestellt. Das Schneidwerkzeug 16 und/oder der Niederhalter 17 sind höhenverstellbar gelagert. Gemäß Figur 2a weist das Schneidwerkzeug 16 mehrere zueinander beabstandete Schneidstempel 18 auf. Die jeweiligen Schneidstempel 18 sind zum Zuschneiden runder Verpackungsecken aus der Folienbahn F ausgebildet.The cutting device 15 comprises a cutting tool 16 and a hold-down device 17 positioned above it Figure 2a the cutting device 15 is shown in an open position. The cutting tool 16 and/or the hold-down device 17 are mounted so that they can be adjusted in height. According to Figure 2a the cutting tool 16 has a plurality of cutting punches 18 spaced apart from one another. The respective cutting stamps 18 are designed to cut round packaging corners from the film web F.

In Figur 2a sind zwischen den jeweiligen Schneidstempeln 18 Schneidmesser 22 befestigt. Die Schneidmesser 22 können die Folienbahn F in einer Richtung quer zur Transportrichtung R zwischen benachbarten Mulden durchtrennen.In Figure 2a 18 cutting blades 22 are fixed between the respective cutting punches. The cutting knives 22 can cut through the film web F in a direction transverse to the transport direction R between adjacent troughs.

Entsprechend einer horizontal projizierten Geometrie der Schneidstempel 18 und der dazwischen positionierten Schneidmesser 22 weist der Niederhalter 17 eine dementsprechende Matrize 23 auf. Gemäß Figur 2a ist die Matrize 23 mit sternförmig ausgebildeten Öffnungen 24 als Durchstoßöffnungen für die Schneidstempel 18 ausgestattet, in welche, das zeigen die Figuren 2b bis 2d, die Schneidstempel 18 eintauchen können, um in der Folienbahn F runde Verpackungsecken herzustellen.The hold-down device 17 has a die 23 corresponding to a horizontally projected geometry of the cutting stamps 18 and the cutting knives 22 positioned between them. According to Figure 2a the die 23 is equipped with star-shaped openings 24 as penetration openings for the cutting die 18, in which the show the Figures 2b to 2d , The cutting die 18 can immerse in order to produce round packaging corners in the film web F.

Die in Figur 2a am Schneidwerkzeug 16 gelagerten Schneidstempel 18 weisen jeweils eine Schneidkante 25 auf, die eine sich sowohl in Quer- als auch in Längserstreckung des Schneidstempels 18 verlaufende Schneidkontur 26 bildet. Die Schneidkontur 26 ist somit hinsichtlich einer Schneidebene E (siehe Figur 3a), in welcher die Folienbahn F geführt ist, dreidimensional ausgebildet.In the Figure 2a cutting punches 18 mounted on the cutting tool 16 each have a cutting edge 25, which extends both in the transverse and in the longitudinal direction of the Cutting punch 18 extending cutting contour 26 forms. The cutting contour 26 is thus with respect to a cutting plane E (see Figure 3a ), in which the film web F is guided, formed three-dimensionally.

Wie die Schneidstempel 18 und die dazwischen positionierten Schneidmesser 22 mit der innerhalb des Niederhalters 17 ausgebildeten Matrize 23 zusammenarbeiten, wird anhand der Figuren 2b bis 2d dargestellt.How the cutting punch 18 and the cutting blade 22 positioned between them work together with the die 23 formed within the hold-down device 17 is illustrated in FIG Figures 2b to 2d shown.

Figur 2b zeigt, dass an den jeweiligen Schneidstempeln 18 ausgebildete Spitzen 27 zunächst in die am Niederhalter 17 ausgebildete Matrize 23 eintauchen, wenn sich die Schneideinrichtung 15 schließt. Damit wird erreicht, dass beim Schneidvorgang nicht mit der gesamten Schneidkante 25 auf einmal die Folienbahn F (siehe Fig. 3a) durchstoßen wird, sondern zunächst gewissermaßen punktuell die Spitzen 27 in die Folienbahn F hineingestochen werden. Dabei durchtrennen die Spitzen 27 mit zunehmender Eindringtiefe die Folienbahn F immer weiter, bis ein kompletter sternförmiger Ausschnitt (siehe Fig. 3g) hergestellt ist. Dadurch, dass die Spitzen 27 der jeweiligen Schneidstempel 18 mit zunehmender Eindringtiefe, d.h. mit größer werdendem Querschnitt, in die Folienbahn F hineinstechen, kann die jeweilige Schneidkante 25 der Schneidstempel 18 mit einer reduzierten Schneidkraft die Folienbahn F durchtrennen. Figure 2b shows that tips 27 formed on the respective cutting punches 18 initially dip into the die 23 formed on the hold-down device 17 when the cutting device 15 closes. This ensures that during the cutting process the film web F is not cut with the entire cutting edge 25 at once (see Figure 3a ) is pierced, but rather the points 27 are initially pricked into the film web F at certain points. The tips 27 continue to cut through the film web F with increasing penetration depth until a complete star-shaped cutout (see Fig 3g ) is made. Because the tips 27 of the respective cutting stamps 18 pierce the film web F with increasing penetration depth, ie with an increasing cross section, the respective cutting edge 25 of the cutting stamps 18 can sever the film web F with a reduced cutting force.

Figur 2b zeigt auch, dass beim Schließen der Schneideinrichtung 15 zunächst die Spitzen 27 der Schneidstempel 18 die runden Verpackungsecken aus der Folienbahn F ausschneiden. Im Anschluss daran, dass zeigt die Figur 2c, tauchen die zwischen den Schneidstempeln 18 positionierten Schneidmesser 22 durch die im Niederhalter 17 ausgebildete Matrize 23 hindurch, wodurch zwischen den runden, bereits ausgeschnittenen Verpackungsecken Querschnitte erzeugt werden. Figure 2b also shows that when the cutting device 15 is closed, the tips 27 of the cutting stamps 18 first cut the round packaging corners out of the film web F. Following that shows the Figure 2c , the cutting blades 22 positioned between the cutting punches 18 penetrate through the die 23 formed in the hold-down device 17, as a result of which cross-sections are produced between the round, already cut-out packaging corners.

In der Figur 2d sind die Schneidstempel 18 sowie die dazwischen positionierten Schneidmesser 22 maximal in die Matrize 23 im Niederhalter 17 eingetaucht, sodass ein vollständiger Ausschnitt in der Folienbahn F zustande kommt.In the Figure 2d the cutting stamps 18 and the cutting blades 22 positioned between them are immersed to the maximum extent in the matrix 23 in the holding-down device 17, so that a complete cutout in the film web F is produced.

Die in den Figuren 2a bis 2d am Schneidwerkzeug 16 gezeigten äußeren Schneidstempel 18 weisen eine Klinge 28 auf, anhand welcher die Folienbahn F an ihren Außenseiten durchtrennt werden kann.The in the Figures 2a to 2d The outer cutting stamps 18 shown on the cutting tool 16 have a blade 28, by means of which the film web F can be severed on its outer sides.

Die Figuren 2a bis 2d zeigen, dass die jeweiligen Schneidstempel 18 einen domartigen Schneidkopf aufweisen. Damit kann der Schneidstempel 18 unter geringem Kraftaufwand mit den Spitzen 27 voraus in die Folienbahn F einstechen, sodass sich ein in die Folienbahn F einziehender Schneidverlauf ergibt. Daraus resultiert, dass sich innerhalb der Folienbahn F während des Schneidvorgangs geringe Spannungen bilden, was einen präziseren Folienausschnitt ermöglicht.the Figures 2a to 2d show that the respective cutting dies 18 have a dome-like cutting head. Thus, the cutting punch 18 with little effort pierce the tips 27 into the film web F ahead of time, resulting in a cutting path that draws into the film web F. The result of this is that small tensions form within the film web F during the cutting process, which enables the film to be cut out more precisely.

Die Figuren 3a bis 3g zeigen, wie der Schneidstempel 18 mit zunehmender Eindringtiefe immer weiter mit seiner Schneidkante 25 in die Folienbahn F eindringt. Die Folienbahn F ist in Figur 3a innerhalb der Schneidebene E positioniert. In dieser Schneidebene E wird die Folienbahn F zwischen dem Schneidwerkzeug 16 und dem darüber positionierten Niederhalter 17für den Schneidvorgang vorgehalten.the Figures 3a to 3g show how the cutting stamp 18 penetrates further and further with its cutting edge 25 into the film web F with increasing penetration depth. The foil web F is in Figure 3a positioned within the cutting plane E. In this cutting plane E, the film web F is held in reserve for the cutting process between the cutting tool 16 and the hold-down device 17 positioned above it.

Figur 3a zeigt, dass der Schneidstempel 18 bereits mit seinen Spitzen 27 punktförmig die Folienbahn F durchstößt. Die Spitzen 27 können dabei unter vergleichsweise geringem Kraftaufwand in die Folienbahn F eindringen. Die Figur 3a zeigt, dass die Schneidkante 25 des Schneidstempels 18 zwischen den Spitzen 27 größtenteils noch unterhalb der Folienbahn F positioniert ist. Mit zunehmendem Eindringen des Schneidstempels 18 in die Folienbahn F durchtrennt die Schneidkante 25 die Folienbahn F immer mehr, wodurch ein vollständiger Ausschnitt entsteht. Dies zeigen die Figuren 3b bis 3g. Figure 3a shows that the cutting stamp 18 already punctuates the film web F with its tips 27 in a punctiform manner. The tips 27 can penetrate into the film web F with comparatively little effort. the Figure 3a shows that the cutting edge 25 of the cutting die 18 between the tips 27 is mostly still positioned below the film web F. As the cutting stamp 18 penetrates the film web F more and more, the cutting edge 25 cuts through the film web F more and more, resulting in a complete cutout. This is what they show Figures 3b to 3g .

Im Schneidstempel 18 aus Figur 3a ist eine Vertiefung 29 ausgebildet. Die Vertiefung 29 bildet zusammen mit einer umfangseitig am Schneidstempel 18 ausgebildeten Konkavität 30 die kurvenförmige Schneidkante 25 aus.In the cutting punch 18 off Figure 3a a recess 29 is formed. The indentation 29 forms the curved cutting edge 25 together with a concavity 30 formed circumferentially on the cutting punch 18 .

Gemäß Figur 3a ist die Vertiefung 29 konusförmig ausgebildet. Zur Herstellung der Vertiefung 29 könnte ein konisches Fräswerkzeug eingesetzt werden, sodass die Vertiefung 29 hinsichtlich einer Längsachse des Schneidstempels 18 zumindest teilweise in Form eines Kegelstumpfs vorliegt.According to Figure 3a the recess 29 is cone-shaped. A conical milling tool could be used to produce the depression 29 so that the depression 29 is at least partially in the form of a truncated cone with respect to a longitudinal axis of the cutting punch 18 .

Die in Figur 3a an der Außenseite des Schneidstempels 18 ausgebildeten Konkavitäten 30 bilden zusammen mit der Vertiefung 29 einen domartigen Schneidkopf aus dessen Spitzen 27 beim Schneidvorgang wie Messerspitzen die Folienbahn F durchstoßen. Die Konkavitäten 30 können anhand eines zylindrischen Fräswerkzeugs hergestellt werden.In the Figure 3a concavities 30 formed on the outside of the cutting die 18 form, together with the depression 29, a dome-like cutting head from the tips 27 of which pierce the film web F like knife tips during the cutting process. The concavities 30 can be produced using a cylindrical milling tool.

Figur 3b zeigt die Spitzen 27 im Vergleich zur Fig. 3a mit zunehmender Eindringtiefe. In Anbetracht der Figuren 3a bis 3g wird gezeigt, dass die Schneidkante 25 beim Einfahren des Schneidstempels 18 in die Matrize 23 (siehe Figuren 2a bis 2d) immer weiter die Folienbahn F durchtrennt. Die zunehmend durch die Folienbahn F hindurch gezogene Schneidkante 25 zieht sich damit wie ein Messer durch die Folienbahn F hindurch bis gemäß Figur 3g die Spitzen 27 vollständig oberhalb der Folienbahn F positioniert sind, womit die runden Verpackungsecken komplett ausgeschnitten sind. Figure 3b shows the peaks 27 compared to Figure 3a with increasing penetration depth. Considering the Figures 3a to 3g it is shown that the cutting edge 25 when the cutting punch 18 moves into the die 23 (see Figures 2a to 2d ) continues to cut through the film web F. The cutting edge 25, which is increasingly pulled through the film web F runs like a knife through the film web F through to Figure 3g the tips 27 are positioned completely above the film web F, with which the round package corners are completely cut out.

Figur 4 zeigt einen ausführungsgemäßen Schneidstempel 18' in verschiedenen Ansichten. Der Schneidstempel 18' aus Figur 4 weist eine Schneidkante 25' auf, die in Längserstreckung des Schneidstempels 18' ausgebildete Spitzen 27' vorsieht, die zwischen in Quererstreckung des Schneidstempels 18' ausgebildeten Spitzen 27" liegen. Der Schneidstempel 18' hat damit in einer horizontalen Projektionsebene betrachtet die in Figur 4 gezeigte Sternenform, d.h. einen sternförmigen Schnittlinienverlauf, wie er auch mittels des in den Figuren 3a bis 3g gezeigten Schneidstempels 18 herstellbar ist. figure 4 shows a cutting punch 18' according to the embodiment in different views. The cutting punch 18' from figure 4 has a cutting edge 25', which provides tips 27' formed in the longitudinal extension of the cutting punch 18', which lie between tips 27" formed in the transverse extension of the cutting punch 18'. The cutting punch 18' thus has, viewed in a horizontal projection plane, the figure 4 Star shape shown, ie a star-shaped cutting line course, as it also means in the Figures 3a to 3g shown punch 18 can be produced.

Der bei der Erfindung eingesetzte Schneidstempel 18, 18' verfügt über eine Schneidkante 25, 25' mit einer dreidimensionalen Schneidkontur 26, 26', anhand welcher ein mit zunehmender Eindringtiefe allmählich mitwandernder Schnittverlauf herstellbar ist, sodass die Querschneideeinrichtung 4 unter vergleichsweise geringen Schneidkräften arbeiten kann, um runde Verpackungsecken herzustellen. Anhand der dreidimensionalen, kurvenförmigen Schneidkontur 26, 26' lässt sich ein Wegklappen der hergestellten Folienausschnitte verhindern, sodass insgesamt ein präziser Ausschnitt ermöglicht wird. Die Herstellung eines erfindungsgemäß an der Schneideinrichtung 15 eingesetzten Schneidstempels 18, 18' ist kostengünstig anhand einer Fräsmaschine mit Einachsbetrieb möglich. Die erfindungsgemäßen Schneidstempel 18, 18' verbessern begünstigen ein präzises Vereinzeln von Verpackungen aus der Folienbahn F, lassen sich als solche wirtschaftlich herstellen und ermöglichen einen effizienten Betrieb der Querschneideeinrichtung 4.The cutting punch 18, 18' used in the invention has a cutting edge 25, 25' with a three-dimensional cutting contour 26, 26', which can be used to produce a cutting path that gradually moves along with increasing penetration depth, so that the cross-cutting device 4 can work with comparatively low cutting forces. to produce round packaging corners. The three-dimensional, curved cutting contour 26, 26' can be used to prevent the film sections produced from folding away, so that a precise section is made possible overall. A cutting punch 18, 18' used according to the invention on the cutting device 15 can be produced inexpensively using a milling machine with single-axis operation. The cutting stamps 18, 18' according to the invention improve the precise separation of packaging from the film web F, can be produced economically as such and enable efficient operation of the cross-cutting device 4.

Claims (15)

Schneideinrichtung (15), die zum Zuschneiden von im Wesentlichen runden Verpackungsecken aus einer Folienbahn (F) ausgebildet ist, wobei die Schneideinrichtung (15) mindestens ein Schneidwerkzeug (16) aufweist, das einen Schneidstempel (18, 18') umfasst, der an seiner Außenseite mindestens eine Konkavität (30) aufweist, die zum Ausbilden einer Schneidkante (25, 25') des Schneidstempels (18, 18') vorgesehen ist, dadurch gekennzeichnet, dass die Schneidkante (25, 25') eine sich sowohl in Quer- als auch in Längserstreckung des Schneidstempels (18, 18') verlaufende Schneidkontur (26, 26') aufweist.Cutting device (15) which is designed for cutting substantially round packaging corners from a film web (F), the cutting device (15) having at least one cutting tool (16) which comprises a cutting die (18, 18') which is attached to its Outside has at least one concavity (30), which is provided for forming a cutting edge (25, 25 ') of the cutting punch (18, 18'), characterized in that the cutting edge (25, 25 ') a both in transverse and also has a cutting contour (26, 26') running in the longitudinal extension of the cutting punch (18, 18'). Schneideinrichtung nach Anspruch 1, dadurch gekennzeichnet, dass die Schneidkante (25, 25') in einer Schneidebene (E) projiziert zumindest teilweise eine sternförmig ausgebildete Schneidkontur (26, 26') aufweist.Cutting device according to Claim 1, characterized in that the cutting edge (25, 25') has, at least partially, a star-shaped cutting contour (26, 26') projected in a cutting plane (E). Schneideinrichtung nach einem der vorangehenden Ansprüche, dadurch gekennzeichnet, dass der Schneidstempel (18, 18') mehrere Spitzen (27, 27', 27") aufweist, die sowohl in Quer- als auch in Längserstreckung des Schneidstempels (18, 18') ausgebildet sind.Cutting device according to one of the preceding claims, characterized in that the cutting punch (18, 18') has a plurality of tips (27, 27', 27"), which are formed both in the transverse and in the longitudinal extension of the cutting punch (18, 18'). are. Schneideinrichtung nach Anspruch 3, dadurch gekennzeichnet, dass entlang der Schneidkontur (26) der Schneidkante (25) die in Längserstreckung des Schneidstempels (18) ausgebildeten Spitzen (27) den in Quererstreckung des Schneidstempels (18) ausgebildeten Spitzen (27) entsprechen.Cutting device according to Claim 3, characterized in that along the cutting contour (26) of the cutting edge (25) the tips (27) formed in the longitudinal extent of the cutting stamp (18) correspond to the points (27) formed in the transverse extent of the cutting stamp (18). Schneideinrichtung nach Anspruch 3, dadurch gekennzeichnet, dass entlang der Schneidkontur (26') der Schneidkante (25') die in Längserstreckung des Schneidstempels (18') ausgebildeten Spitzen (27') zwischen den in Quererstreckung des Schneidstempels (18') ausgebildeten Spitzen (27") ausgebildet sind.Cutting device according to Claim 3, characterized in that along the cutting contour (26') of the cutting edge (25') the tips (27') formed in the longitudinal extent of the cutting stamp (18') are located between the points (27') formed in the transverse extent of the cutting stamp (18'). 27") are formed. Schneideinrichtung nach einem der vorangehenden Ansprüche, dadurch gekennzeichnet, dass der Schneidstempel (18, 18') mindestens eine Vertiefung (29) aufweist, die mit der ersten Konkavität (30) überlagert die Schneidkante (25) ausbildet.Cutting device according to one of the preceding claims, characterized in that the cutting punch (18, 18') has at least one depression (29) which forms the cutting edge (25) superimposed with the first concavity (30). Schneideinrichtung nach Anspruch 6, dadurch gekennzeichnet, dass die Vertiefung (29) konusförmig ausgebildet ist.Cutting device according to claim 6, characterized in that the recess (29) is cone-shaped. Schneideinrichtung nach Anspruch 6 oder 7, dadurch gekennzeichnet, dass die Vertiefung (29) hinsichtlich einer Längsachse des Schneidstempels (18) zumindest teilweise in Form eines Kegelstumpfs vorliegt.Cutting device according to Claim 6 or 7, characterized in that the depression (29) is at least partially in the form of a truncated cone with respect to a longitudinal axis of the cutting punch (18). Schneideinrichtung nach einem der vorangehenden Ansprüche, dadurch gekennzeichnet, dass der Schneidstempel (18, 18') einteilig ausgebildet ist.Cutting device according to one of the preceding claims, characterized in that the cutting punch (18, 18') is constructed in one piece. Schneideinrichtung nach einem der vorangehenden Ansprüche, dadurch gekennzeichnet, dass der Schneidstempel (18, 18') an dessen Außenseite vier Konkavitäten (30) aufweist.Cutting device according to one of the preceding claims, characterized in that the cutting punch (18, 18') has four concavities (30) on its outside. Tiefziehverpackungsmaschine (1), die in einer Transportrichtung (R) eine Formstation (2), eine Siegelstation (3), eine Querschneidestation (4) und eine Längsschneidestation (5) aufweist, wobei die Querschneidestation (4) mindestens eine Schneideinrichtung (15) gemäß einem der vorangehenden Ansprüche umfasst.Thermoforming packaging machine (1), which has a forming station (2), a sealing station (3), a transverse cutting station (4) and a longitudinal cutting station (5) in a transport direction (R), the transverse cutting station (4) having at least one cutting device (15) according to any of the preceding claims. Verfahren zur Herstellung eines Schneidstempels (18, 18'), wobei an einer Außenseite eines Werkstückrohlings mindestens eine Konkavität (30) hergestellt wird und wobei an einer anderen Seite des Werkstückrohlings eine Vertiefung (29) derart hergestellt wird, dass diese mit der Konkavität (30) überlagert eine Schneidkante (25) des Schneidstempels (18) mit einer sich sowohl in Quer- als auch in Längserstreckung des Schneidstempels (18) verlaufenden Schneidkontur (26) ausbildet.Method for producing a cutting punch (18, 18'), wherein at least one concavity (30) is produced on an outside of a workpiece blank and wherein a depression (29) is produced on another side of the workpiece blank in such a way that it coincides with the concavity (30 ) superimposes a cutting edge (25) of the cutting punch (18) with a cutting contour (26) running both in the transverse and in the longitudinal extension of the cutting punch (18). Verfahren nach Anspruch 12, dadurch gekennzeichnet, dass zur Herstellung der Konkavität (30) ein zylindrisches und zur Herstellung der Vertiefung (29) ein zumindest teilweise konisches, parabelförmiges oder zylindrisches Fräswerkzeug eingesetzt werden.Method according to Claim 12, characterized in that a cylindrical milling tool is used to produce the concavity (30) and an at least partially conical, parabolic or cylindrical milling tool is used to produce the depression (29). Verfahren nach Anspruch 13, dadurch gekennzeichnet, dass das Fräswerkzeug zur Herstellung der Konkavität (30) und das Fräswerkzeug zur Herstellung der Vertiefung (29) mittels einer zumindest temporär zeitgleich gesteuerten Vorschubbewegung die Schneidkante (25) herstellen oder in nacheinander folgenden gesonderten Arbeitsschritten zum Einsatz kommen.Method according to Claim 13, characterized in that the milling tool for producing the concavity (30) and the milling tool for producing the depression (29) produce the cutting edge (25) by means of an at least temporarily simultaneously controlled feed movement or are used in separate work steps that follow one another . Verfahren nach einem der vorangehenden Ansprüche 12 bis 14, dadurch gekennzeichnet, dass der Schneidstempel (18) zumindest entlang dessen Schneidkante (25) mittels eines thermischen Verfahrens ausgehärtet wird.Method according to one of the preceding claims 12 to 14, characterized in that the cutting stamp (18) is hardened at least along its cutting edge (25) by means of a thermal process.
EP21199898.4A 2020-10-01 2021-09-29 Cutting device and method for producing a cutting stamp Active EP3978378B1 (en)

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DE102020125688.4A DE102020125688A1 (en) 2020-10-01 2020-10-01 CUTTING EQUIPMENT AND METHOD OF MAKING A CUTTING STAMP

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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE20216772U1 (en) 2002-10-31 2004-03-11 Trenkle & Schneider Gmbh & Co. Kg Combined punching and cutting tool
EP2311611A2 (en) * 2009-10-14 2011-04-20 Elag Verpackungen AG Procedure and tool for producing cuts from sheet material
EP3109017B1 (en) 2015-06-23 2017-11-29 MULTIVAC Sepp Haggenmüller SE & Co. KG Deep draw packaging machine with film stamp
GB2587057A (en) * 2019-06-06 2021-03-17 Snap On Tools Corp Socket punches

Family Cites Families (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US376136A (en) * 1888-01-10 Albeet burro wes
US2122368A (en) * 1936-11-21 1938-06-28 Gen Tire & Rubber Co Punch
US2936665A (en) * 1957-07-26 1960-05-17 Naffin Alfred Shear for forming rounded corners on rectangular cards, etc.
DE1157466B (en) 1961-12-22 1963-11-14 Hermann Bansbach Cutting tool for cutting thin sheets of paper stacked on top of each other
DE7132214U (en) 1971-08-24 1971-12-09 Fauth E PUNCHING TOOL
EP0605129A1 (en) * 1992-12-30 1994-07-06 Kleineibst, Desmond A device for extracting a plant from the ground
US5893313A (en) * 1995-09-05 1999-04-13 Carl Manufacturing Co., Ltd. Corner cutter
DE102005000786A1 (en) 2005-01-05 2006-07-13 Rehau Ag + Co. Punching tool for the production of apertures in workpieces made of thermoplastic material, punches for this purpose and method for producing such breakthroughs
JP2007075938A (en) * 2005-09-13 2007-03-29 Carl Manufacturing Co Ltd Punch blade
JP4989425B2 (en) * 2007-11-02 2012-08-01 本田技研工業株式会社 Punch punch
WO2017010987A1 (en) * 2015-07-13 2017-01-19 Hewlett-Packard Development Company, L.P. Corner punch device
WO2017010986A1 (en) * 2015-07-13 2017-01-19 Hewlett-Packard Development Company, L.P. Corner shearing device
WO2017074293A1 (en) * 2015-10-26 2017-05-04 Hewlett-Packard Development Company, L.P. Corner punching device
KR101852613B1 (en) * 2016-02-22 2018-06-04 전인호 Pierce punch for press die
WO2018207137A1 (en) * 2017-05-11 2018-11-15 Snpshot Trustee Limited A tissue sample punch

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE20216772U1 (en) 2002-10-31 2004-03-11 Trenkle & Schneider Gmbh & Co. Kg Combined punching and cutting tool
EP2311611A2 (en) * 2009-10-14 2011-04-20 Elag Verpackungen AG Procedure and tool for producing cuts from sheet material
EP3109017B1 (en) 2015-06-23 2017-11-29 MULTIVAC Sepp Haggenmüller SE & Co. KG Deep draw packaging machine with film stamp
GB2587057A (en) * 2019-06-06 2021-03-17 Snap On Tools Corp Socket punches

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EP3978378B1 (en) 2024-08-28

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