EP4074478A1 - Outil de poinçonnage - Google Patents

Outil de poinçonnage Download PDF

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Publication number
EP4074478A1
EP4074478A1 EP22160637.9A EP22160637A EP4074478A1 EP 4074478 A1 EP4074478 A1 EP 4074478A1 EP 22160637 A EP22160637 A EP 22160637A EP 4074478 A1 EP4074478 A1 EP 4074478A1
Authority
EP
European Patent Office
Prior art keywords
cutting
blade
punching
die
wedge
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
EP22160637.9A
Other languages
German (de)
English (en)
Other versions
EP4074478B1 (fr
Inventor
Carsten Lautz
Reto Wenziker
Sven Beierer
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.)
Rohrer Tools Ag
Original Assignee
Rohrer Tools Ag
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
Application filed by Rohrer Tools Ag filed Critical Rohrer Tools Ag
Publication of EP4074478A1 publication Critical patent/EP4074478A1/fr
Application granted granted Critical
Publication of EP4074478B1 publication Critical patent/EP4074478B1/fr
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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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
    • B26—HAND CUTTING TOOLS; CUTTING; SEVERING
    • B26D—CUTTING; DETAILS COMMON TO MACHINES FOR PERFORATING, PUNCHING, CUTTING-OUT, STAMPING-OUT OR SEVERING
    • B26D1/00—Cutting through work characterised by the nature or movement of the cutting member or particular materials not otherwise provided for; Apparatus or machines therefor; Cutting members therefor
    • B26D1/01—Cutting through work characterised by the nature or movement of the cutting member or particular materials not otherwise provided for; Apparatus or machines therefor; Cutting members therefor involving a cutting member which does not travel with the work
    • B26D1/04—Cutting through work characterised by the nature or movement of the cutting member or particular materials not otherwise provided for; Apparatus or machines therefor; Cutting members therefor involving a cutting member which does not travel with the work having a linearly-movable cutting member
    • B26D1/06—Cutting through work characterised by the nature or movement of the cutting member or particular materials not otherwise provided for; Apparatus or machines therefor; Cutting members therefor involving a cutting member which does not travel with the work having a linearly-movable cutting member wherein the cutting member reciprocates
    • B26D1/08—Cutting through work characterised by the nature or movement of the cutting member or particular materials not otherwise provided for; Apparatus or machines therefor; Cutting members therefor involving a cutting member which does not travel with the work having a linearly-movable cutting member wherein the cutting member reciprocates of the guillotine type
    • B26D1/085—Cutting through work characterised by the nature or movement of the cutting member or particular materials not otherwise provided for; Apparatus or machines therefor; Cutting members therefor involving a cutting member which does not travel with the work having a linearly-movable cutting member wherein the cutting member reciprocates of the guillotine type for thin material, e.g. for sheets, strips or the like
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B26—HAND CUTTING TOOLS; CUTTING; SEVERING
    • B26D—CUTTING; DETAILS COMMON TO MACHINES FOR PERFORATING, PUNCHING, CUTTING-OUT, STAMPING-OUT OR SEVERING
    • B26D7/00—Details of apparatus for cutting, cutting-out, stamping-out, punching, perforating, or severing by means other than cutting
    • B26D7/18—Means for removing cut-out material or waste
    • B26D7/1818—Means for removing cut-out material or waste by pushing out
    • 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
    • B26F1/40—Cutting-out; Stamping-out using a press, e.g. of the ram type
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B26—HAND CUTTING TOOLS; CUTTING; SEVERING
    • B26D—CUTTING; DETAILS COMMON TO MACHINES FOR PERFORATING, PUNCHING, CUTTING-OUT, STAMPING-OUT OR SEVERING
    • B26D1/00—Cutting through work characterised by the nature or movement of the cutting member or particular materials not otherwise provided for; Apparatus or machines therefor; Cutting members therefor
    • B26D1/0006—Cutting members therefor
    • B26D2001/0053—Cutting members therefor having a special cutting edge section or blade section
    • 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
    • B26F2001/449—Cutters therefor; Dies therefor for shearing, e.g. with adjoining or abutting edges

Definitions

  • the invention relates to a punching tool for cutting plastic-based film elements, with a punching die unit that has a plurality of knife carriers, to each of which at least one punching knife tapering to a cutting blade with a cutting edge is attached, and with a die that is assigned to the punching die unit and is opposite this die for receiving of the film element to be processed, wherein the punch unit is mounted so that it can move relative to the die during a punching stroke in a cutting direction between a starting position and a processing position, with the cutting wedges of the punching knives immersing in the film element to be processed in the processing position and along an edge length of the cutting edge Create cutting line in foil system.
  • stamping tools have been known for a long time.
  • the task of such stamping tools is to cut large-area film elements made of plastic, which can be, for example, a two-dimensional large-area film or a three-dimensional film element.
  • Such three-dimensional film elements can be, for example, yoghurt cups that have to be packaged in a specific way after production, for example to be separated or in specific, for example four, Cut out groups of six or eight.
  • Important components of such punching tools are punching knives, which produce a cutting line when plunging into the foil element.
  • PET-based film elements are tougher in comparison to polystyrene-based film elements, so that the punching knives are exposed to higher loads.
  • the object of the invention is to provide a punching tool of the type mentioned in which the processing of plastic-based film elements, in particular those made of made of thermoplastic material, is more process-reliable compared to conventional stamping tools.
  • the punching tool according to the invention is characterized in that the cutting blade has a first blade surface facing the die and a second blade surface facing away from the die, with a second blade surface extending transversely to the cutting direction downstream of the cutting edge during the cutting process and on an upper side of the die remote part of the film element to be processed which can be brought into contact with the pressing surface.
  • the pressure surface downstream of the cutting edge during the cutting process causes the part of the film element to be processed that faces away from the die to be pressed away in the vertical direction from the part of the film element that faces the die, which in particular rests fixed on the upper step of the die.
  • that part of the film element to be processed which is averted from the die is pressed away from the part of the film element facing the die during the cutting process, in particular the scissor-cutting movement performed by means of the punching knife, so that bridges of material which have not been separated by the cutting process are stretched and made to leave.
  • this is made possible by a relatively simple design change in the area of the cutting blade of the punching knife.
  • the use of cutting blades that have become less sharp during the punching process is possible because the subsequent stretching process ensures a process-reliable separation of the film element to be processed. This increases the service life of the punching knife.
  • the first blade surface is aligned parallel to the wide blade surface.
  • the pressing surface is aligned at least essentially at right angles to the second blade surface.
  • a cutting edge width of the cutting edge extending transversely to the cutting direction is smaller than a pressure surface width of the pressure surface extending transversely to the cutting direction.
  • the width of the pressing surface is expediently designed such that a pressing operation of the pressing surface downstream of the cutting operation of the cutting edge has a sufficient contact area on the part of the film element to be processed that faces away from the upper side of the die.
  • the ratio of the width of the cutting edge to the width of the pressing surface is in the range from 0.1 to 0.8, in particular 0.5 to 0.7.
  • a blade surface height of the second blade surface extending from the cutting edge to the pressing surface is greater than or equal to the pressing surface width.
  • the pressure surface width is greater than the blade surface height of the second blade surface, however, it is preferred to dimension the blade surface height greater than or equal to the pressure surface width.
  • the ratio of the blade surface height to the pressing surface width is in the range of 1.0 to 5.0, in particular 1.5 to 3.0.
  • the cutting wedge has a first wedge surface facing the die and a second wedge surface oriented obliquely to the first wedge surface and facing away from the die, the course of the second wedge surface up to the cutting edge being interrupted by the pressure surface forming a step.
  • the first blade surface of the cutting blade forms a partial section of the first wedge surface, which is aligned in the cutting direction with the first wedge surface.
  • the punching knife is designed in one piece and the cutting blade and pressing surface are also formed during the manufacture of the punching knife.
  • the punching blade can therefore be designed as a monolith on which all functional sections (cutting edge, pressing surface) required for the cutting process are designed.
  • the punching knife is designed in several parts, with a plate-shaped cutting blade element and a wedge-shaped blade carrier to which the cutting blade element is attached in such a way that a front lower end of the blade carrier is the pressing surface and an overhang of the cutting blade element beyond the lower end of the blade carrier forms the cutting blade.
  • the punching knife prefferably be in the form of a star or contour punch, with which it is possible to punch out flat areas of a film element to be processed. It is expediently possible here to assign a pressing surface to each of the cutting edges of the contour or star punch.
  • the Figures 1 to 5 show a preferred embodiment of the punching tool 11 according to the invention for cutting plastic-based film elements 12.
  • the punching tool 11 according to the invention is described below using a three-dimensional PET-based film element 12 as an example, which can be a yoghurt cup, for example.
  • a three-dimensional PET-based film element 12 as an example, which can be a yoghurt cup, for example.
  • the punching tool 11 according to the invention it is possible, for example, to fabricate two-dimensional or three-dimensional PET, PP, PLA or PVC-based film elements.
  • the aim of the stamping processing of the plastic, in particular PET-based film elements 12 is the assembly of the film elements 12 from a quasi-endless tube to form individual groups or individual elements.
  • the punching tool 11 has a punch unit 13 which forms the movable part of the punching tool.
  • a die 14 for receiving the film element 12 to be processed is arranged opposite the punch unit 13, the punch unit 13 being opposite the die 14 during a punching stroke occurring in a stroke direction or cutting direction 15 between an initial position ( figure 1 ) and a processing position 17 ( Figures 3 and 4 ) is mounted relatively movably.
  • the punch unit 13 has a base plate 18, which is shown as an example in a rectangular shape. Several functional components of the punch unit 13 are fastened to the base plate 18 .
  • the functional components include several punching knife modules 19, each of which has at least one punching knife 20, which is mounted on a knife carrier (not shown), for example height-adjustable, with the knife carrier being connected to the base plate 18 via a base body 21.
  • the punching knives 20 are each detachably attached to an assigned knife seat (not shown) of the knife carrier by means of fastening means.
  • the functionality and the structure or the geometry and contour of the punching knife 20 are explained on a single punching knife 20 .
  • the other punching knives of the punching die unit or at least one group of punching knives of the punching die unit 13 are also designed in the same way.
  • Fastening screws (not shown) are used as fastening means, for example, which have associated through-holes 22a, 22b ( Figures 2 to 4 ) prevail in the punching knife 20 and are sunk into associated recesses (not shown) in a bearing section of the knife carrier.
  • a tuning element in the form of a relatively thin tuning disc can be arranged between the seating surface of the knife seat and the punching knife 20 .
  • the punching blade 20 has a bearing or clamping section 23 which is penetrated transversely to the cutting direction 15 by the two through-holes 22a, 22b.
  • the punching knife 20 is fastened to the associated knife seat of the knife carrier via the clamping section 23 and the through holes 22a, 22b with the aid of suitable fastening screws.
  • a cutting wedge 24 adjoins the clamping section 23 along the cutting direction 15, at the lower end of which a cutting blade 25 is formed or arranged.
  • the cutting wedge 24 has a first wedge surface 26 facing the die 14 and a second wedge surface 27 oriented obliquely to the first wedge surface 26 and facing away from the die 14.
  • the blade surfaces of the cutting blade are preferably aligned parallel to one another.
  • the cutting blade 25 has a first blade surface 28 facing the die 14 and a second blade surface 29 which is aligned parallel to the first blade surface 28 and faces away from the die 14.
  • a cutting edge 30 which is designed to produce a cutting line in the film element 12 to be processed.
  • the cutting edge 30 is designed as a straight, uncontoured cutting edge over its edge length.
  • other types of cutting edges for example those with a sawtooth-like cutting contour.
  • the cutting edge itself to be designed in the shape of a wedge, for example by two cutting edge sections converging towards one another, which for example form a cutting edge wedge in the middle.
  • An essential aspect of the invention is that the second blade surface 29 is adjoined by a pressing surface 33, which extends transversely to the cutting direction 15 and is downstream of the cutting edge 30 during the cutting process and can be brought into contact with an upper side 31 of the part 32 of the film element 12 to be processed that is remote from the die 14 .
  • the pressing surface 33 is aligned at least essentially at right angles, in particular at right angles to the second blade surface 29 .
  • the course of the oblique second wedge surface 27 up to the cutting edge 30 is interrupted by the pressure surface 33 forming a shoulder or step.
  • the Figures 1 to 4 show a first embodiment of the punching blade 20.
  • the punching blade 20 is a monolith, for example made of tool steel or hard metal.
  • the punching knife 20 can be provided with a surface coating.
  • the functional sections of the punching knife i.e. the wedge surfaces 26, 27, the cutting blade 25 with the blade surfaces 28, 29, the cutting edge 30 and the pressing surface 33 are formed at the same time during the manufacture of the punching knife.
  • the figure 5 shows a second embodiment of the punching knife.
  • the punching knife 20 is designed in several parts, with a plate-shaped cutting blade element 34, which can consist, for example, of a relatively thin, in particular very stiff blade suitable for a cutting process, and a wedge-shaped blade carrier 35, on which the cutting blade element 34 is attached by means of suitable fastening means such is fixed in such a way that a front lower end of the blade carrier 35 forms the pressing surface 33 and a projection of the cutting blade element 34 beyond the lower end of the blade carrier 35 forms the cutting blade 25 .
  • a plate-shaped cutting blade element 34 which can consist, for example, of a relatively thin, in particular very stiff blade suitable for a cutting process
  • a wedge-shaped blade carrier 35 on which the cutting blade element 34 is attached by means of suitable fastening means such is fixed in such a way that a front lower end of the blade carrier 35 forms the pressing surface 33 and a projection of the cutting blade element 34 beyond the lower end of the blade carrier 35 forms the cutting blade 25 .
  • a cutting edge width b1 of the cutting edge 30 extending transversely to the cutting direction 15 is smaller than a pressure surface width b2 of the pressure surface 33 extending transversely to the cutting direction 15.
  • the ratio of cutting edge width to pressure surface width b1/b2 is in the range of 0.1 to 0.8, in particular 0.5 to 0.7.
  • a blade face height h1 of the second blade face 29 extending from the cutting edge 30 to the pressing face 33 is greater than or equal to the pressing face width b1.
  • the ratio of the blade surface height to the pressing surface width h1/b2 is in the range from 1.0 to 5.0, in particular 1.5 to 3.0.
  • this ratio can be changed later, for example by changing the position of the cutting blade element 34 in relation to the blade carrier 35, so that the projection of the cutting blade element 34 beyond the lower end of the blade carrier 35 can be varied.
  • the method according to the invention for cutting plastic-based film elements using the punching tool 11 according to the invention takes place in the following steps: Initially, the punch unit 13 is in the raised starting position 16. Depending on the packaging task, groups of punching knives are then arranged so that, for example, a group of four, for example four yoghurt cups, or other groups can be cut out of the film element 12 to be processed.
  • the film element 12 to be processed is placed in the matrix 14 .
  • the die 14 has a die cavity 36 into which the punching blade 20 can enter during the cutting process.
  • the punch unit 13 and die 14 are positioned relative to one another moves, for example in which the punch unit 13 is moved downwards in the direction of the die 24 .
  • the cutting wedge 24 and here in particular the cutting length with the cutting edge 30 arranged on the underside comes into contact with the upper side of the foil element 12 to be processed and the cutting edges 30 of the punching knives 20 each produce cutting lines in the foil element 12.
  • the punch unit 13 is therefore moved further down and moves further into the die cavity 36 of the die 34, with the pressing surface 33 of a respective punching knife 20 coming into contact with the upper side 31 of the part 32 of the film element 12 to be processed which is remote from the die and touching it Part 32 pushes further into the die cavity 36.
  • cutting blades 25 that have become blunt during the punching process can also be used, since the turning process ensures a process-reliable separation of the film element to be processed. As a result, the service life of the punching knife 20 is increased.

Landscapes

  • Life Sciences & Earth Sciences (AREA)
  • Forests & Forestry (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Perforating, Stamping-Out Or Severing By Means Other Than Cutting (AREA)
EP22160637.9A 2021-04-16 2022-03-08 Outil de poinçonnage Active EP4074478B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102021203789.5A DE102021203789B3 (de) 2021-04-16 2021-04-16 Stanzwerkzeug

Publications (2)

Publication Number Publication Date
EP4074478A1 true EP4074478A1 (fr) 2022-10-19
EP4074478B1 EP4074478B1 (fr) 2024-01-24

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP22160637.9A Active EP4074478B1 (fr) 2021-04-16 2022-03-08 Outil de poinçonnage

Country Status (2)

Country Link
EP (1) EP4074478B1 (fr)
DE (1) DE102021203789B3 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN115723181A (zh) * 2022-12-02 2023-03-03 昆山佳合纸制品科技股份有限公司 一种纸板用切割装置

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN116984474B (zh) * 2023-09-20 2023-12-19 山西中航锦恒科技有限公司 一种电缆加工用冲孔裁切装置

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1157466B (de) * 1961-12-22 1963-11-14 Hermann Bansbach Schneidwerkzeug zum Schneiden von aufeinandergeschichteten duennen Blaettern
FR3022818A1 (fr) * 2014-06-30 2016-01-01 Sogameca Sas Perfectionnement aux outils pour la decoupe sur matrice rainuree d'objets multiples dans un materiau en feuille
EP3566832A1 (fr) * 2018-05-07 2019-11-13 Industrias Technológicas de Mecanización y Automatización, S.A. Dispositif de pré-découpe de récipient
EP3722217A1 (fr) * 2019-04-10 2020-10-14 Industrias Tecnológicas de Mecanización y Automatizaciòn, S.A. Récipient à emballage multiple et sa machine de fabrication
EP3766799A1 (fr) * 2019-07-17 2021-01-20 Synerlink Equipement et méthode pour former une ligne de prédécoupe dans un pack de pots de produit alimentaire

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AT15618B (de) 1903-05-22 1904-03-26 Richard Bock Brikettpresse.
ATE15618T1 (de) 1981-07-10 1985-10-15 Bording Grafik As Stanzvorrichtung insbesondere zum stanzen von etiketten und sonstigen gedruckten erzeugnissen.
DE102008027899A1 (de) 2008-06-11 2009-12-17 Frimo Group Gmbh Verfahren zum Einstanzen einer Durchbrechung in ein polymeres Formteil

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1157466B (de) * 1961-12-22 1963-11-14 Hermann Bansbach Schneidwerkzeug zum Schneiden von aufeinandergeschichteten duennen Blaettern
FR3022818A1 (fr) * 2014-06-30 2016-01-01 Sogameca Sas Perfectionnement aux outils pour la decoupe sur matrice rainuree d'objets multiples dans un materiau en feuille
EP3566832A1 (fr) * 2018-05-07 2019-11-13 Industrias Technológicas de Mecanización y Automatización, S.A. Dispositif de pré-découpe de récipient
EP3722217A1 (fr) * 2019-04-10 2020-10-14 Industrias Tecnológicas de Mecanización y Automatizaciòn, S.A. Récipient à emballage multiple et sa machine de fabrication
EP3766799A1 (fr) * 2019-07-17 2021-01-20 Synerlink Equipement et méthode pour former une ligne de prédécoupe dans un pack de pots de produit alimentaire

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN115723181A (zh) * 2022-12-02 2023-03-03 昆山佳合纸制品科技股份有限公司 一种纸板用切割装置
CN115723181B (zh) * 2022-12-02 2023-09-19 昆山佳合纸制品科技股份有限公司 一种纸板用切割装置

Also Published As

Publication number Publication date
DE102021203789B3 (de) 2022-08-11
EP4074478B1 (fr) 2024-01-24

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