EP3793759A1 - Verfahren und vorrichtung zum schneiden eines werkstücks - Google Patents
Verfahren und vorrichtung zum schneiden eines werkstücksInfo
- Publication number
- EP3793759A1 EP3793759A1 EP19718340.3A EP19718340A EP3793759A1 EP 3793759 A1 EP3793759 A1 EP 3793759A1 EP 19718340 A EP19718340 A EP 19718340A EP 3793759 A1 EP3793759 A1 EP 3793759A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- cutting
- workpiece
- cutting edge
- contact surface
- cutting means
- 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.)
- Withdrawn
Links
- 238000005520 cutting process Methods 0.000 title claims abstract description 296
- 238000000034 method Methods 0.000 title claims abstract description 52
- 238000005452 bending Methods 0.000 claims abstract description 28
- 230000000295 complement effect Effects 0.000 claims description 4
- 239000000463 material Substances 0.000 description 23
- 229910000831 Steel Inorganic materials 0.000 description 6
- 239000010959 steel Substances 0.000 description 6
- 238000000926 separation method Methods 0.000 description 5
- 230000000694 effects Effects 0.000 description 4
- 230000000977 initiatory effect Effects 0.000 description 4
- 239000002184 metal Substances 0.000 description 4
- 230000008569 process Effects 0.000 description 4
- 230000009467 reduction Effects 0.000 description 4
- 238000009966 trimming Methods 0.000 description 4
- 230000009471 action Effects 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 230000015572 biosynthetic process Effects 0.000 description 2
- 238000007373 indentation Methods 0.000 description 2
- 230000000630 rising effect Effects 0.000 description 2
- 230000000052 comparative effect Effects 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 210000001061 forehead Anatomy 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000011835 investigation Methods 0.000 description 1
- 238000005304 joining Methods 0.000 description 1
- 238000003698 laser cutting Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000035515 penetration Effects 0.000 description 1
- 230000002028 premature Effects 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 238000004080 punching Methods 0.000 description 1
- 238000010992 reflux Methods 0.000 description 1
- 230000008439 repair process Effects 0.000 description 1
- 238000004088 simulation Methods 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 238000003856 thermoforming Methods 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
- B23P23/00—Machines or arrangements of machines for performing specified combinations of different metal-working operations not covered by a single other subclass
- B23P23/04—Machines or arrangements of machines for performing specified combinations of different metal-working operations not covered by a single other subclass for both machining and other metal-working operations
-
- 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
- B21D28/02—Punching blanks or articles with or without obtaining scrap; Notching
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23D—PLANING; SLOTTING; SHEARING; BROACHING; SAWING; FILING; SCRAPING; LIKE OPERATIONS FOR WORKING METAL BY REMOVING MATERIAL, NOT OTHERWISE PROVIDED FOR
- B23D35/00—Tools for shearing machines or shearing devices; Holders or chucks for shearing tools
- B23D35/001—Tools for shearing machines or shearing devices; Holders or chucks for shearing tools cutting members
Definitions
- the invention relates to a method for cutting a workpiece, in particular a circuit board or a component, comprising the steps of: inserting the workpiece into a cutting device, the cutting device having a first tool half with at least one workpiece holder and at least one first cutting means, which has a first cutting edge and a Contact surface comprises, and a second mold half having at least a second cutting means having a second cutting edge and a contact surface, clamping the workpiece by means of the workpiece holder and the abutment surface of the second cutting means, cutting the workpiece by means of the cutting means. Furthermore, the invention relates to a device for cutting a workpiece, in particular a circuit board or to
- trimming component with a first mold half and a second
- first mold half comprises at least one workpiece holder and at least one first cutting means having a first cutting edge and a contact surface and wherein the second mold half comprises at least a second cutting means having a second cutting edge and a contact surface.
- Shear cutting and laser cutting The aim of cutting processes is to produce as high-quality cutting edges as possible, which are characterized by a large amount of smooth cut, little or no burr,
- Curing in the edge occurs predominantly in soft or tough
- Cutting material is more and more removed.
- high-strength materials especially steels
- steels are used. These can be both cold and hot formed, have tensile strengths up to 1900 MPa or even more and / or be very tough. In particular, the mechanical trimming this
- Cut edge quality can not be satisfactorily achieved.
- the invention is therefore an object of the invention to provide a fast and reliable method and an apparatus for cutting a workpiece, with which the wear of the device, in particular the wear of the
- the workpiece prior to cutting, has both a first pre-bend, which is generated substantially counter to the cutting direction, in particular its maximum stress is substantially in the area of the contact surface of the second cutting means at a defined distance from the cutting location. as well as (preferably temporally after the first pre-bend) a second pre-bend in the cutting direction, in particular for the cutting process, which in particular both in the field of
- Cutting agent located in the immediate vicinity of the cutting site experiences.
- the direction of cutting, in which the first cutting means moves is understood to mean in particular the direction of the cutting.
- a first pre-bend, in particular at the cutting location is produced, which can be larger if necessary, and in particular much larger than identical pre-bends in the prior art.
- the bending process of the particular second, large pre-bending of the workpiece can be carried out until immediately before the actual cutting process. This is accomplished by having a portion of the pre-bend in the area of action of the first cutting means and the other in that of the second cutting means. That is, before both the first cutting means and the second cutting means start the actual cutting process, said second, large pre-bend is already introduced into the corresponding area of action.
- the convex portion is related to the
- the toolholder mold preferably behaves complementary to the S-shape and preferably extends only to the rising region of the convex region, as described in detail above with respect to the device according to the invention.
- Cutting edge for example, up to 1690 MPa.
- an even higher von Mises stress of, for example, up to 1800 MPa is produced at the second cutting edge.
- inventive method » realized for example by a slightly S-shaped curvature of the contact surface of the second cutting means » have the first and the second cutting edge during the pre-bending on the way to the gate no contact with the workpiece.
- slightly rounded cutting edges counteract further stress concentrations.
- the low-cut portion which hardly exists in high-strength materials, avoids the formation of burrs on the underside of the sheet metal, so that substantially burr-free edges can be produced by the method according to the invention.
- a significantly lower cutting edge wear can be achieved, which the maintenance and
- the trimmed workpiece can either be in the
- Cutting device further processed or removed from the cutting device.
- the method is especially for cutting high-strength and brittle
- Pre-bending parameters can also be used for cutting soft and tough materials.
- the workpiece is preferably a steel material.
- the workpiece is made of a high strength, high strength, or high strength steel material (eg, having a tensile strength greater than 500 MPa, greater than 700 MPa, or even greater than 1000 MPa). It has been shown that especially workpieces with
- Procedure can be edited.
- thin sheets having a thickness of 0.1 mm to 5.0 mm are preferably processed by the method according to the invention.
- the first tool half and the first cutting means are preferably an upper mold half with an upper cutting means.
- the second tool half and the second cutting means are preferably a lower tool half with a lower cutting means.
- the first and the second cutting means are designed as knives, in particular each with a slightly rounded cutting edge.
- the workpiece holder is preferably at least one
- the contact surface of the second cutting means is preferably a specially designed bearing surface for the mounting or inserting of a workpiece to be cut, wherein the workpiece holder has a contact surface, which preferably offset by the workpiece thickness, and preferably
- the tensile stress generated in the workpiece by the first pre-bend is either smaller than its yield strength, essentially corresponds to its yield strength or is greater than its yield strength.
- the bending moment is set at such a large value that the resulting maximum tensile stress is close to or greater than the yield strength of the respective material.
- the specification essentially means in particular a range of ⁇ 15% to the yield strength and ⁇ 5% to the tensile strength. For such a biased material then satisfies a relatively low shear stress by the cutting means for initiating and carrying out the separation process.
- the workpiece preferably experiences the first pre-bend when clamping between the workpiece holder or its contact surface and the contact surface (bearing surface) of the second cutting means.
- the first pre-bend pre-bend in terms of time, preferably before the second pre-bend
- the workpiece is bent upwards, with none of the cutting edges still making contact with the workpiece and thus no load occurring thereon.
- the workpiece holder is in particular with such a large force
- the workpiece undergoes the second pre-bending during lowering of the first cutting means and when contacting the contact surface of the first cutting means with the workpiece.
- the second pre-bending of the workpiece takes place in the opposite direction of the first pre-bend.
- the workpiece preferably comes first
- Vorbiegungsanteil the first pre-bend which is initiated by the contour of the workpiece holder in conjunction with the contour of the contact surface, only to hold so large that the sheet underneath does not plastically deformed.
- the prebending angle is then material-dependent. The higher the strength and the thinner the material, the bigger it can be and vice versa.
- Both Vorbiegevorlandais in connection with the clamping of the workpiece for example, both surfaces of the workpiece to be cut between a tightening of the workpiece "is fixed to the workpiece holder and the bearing surface of the second cutting means so that it is not prevented from the area to be cut of the bearing surface of the second cutting means substantially and thereby the quality of the cut edges is further increased.
- the first and / or the second pre-bend are elastic. That is, the workpiece is claimed in the claimed area substantially not beyond its elastically deformable area by the elastic pre-bending springs the snipped workpiece after the cutting process back to its original shape. Thus, the bending and cutting process does not affect the shape of the workpiece.
- an open cut is produced by the cutting process by means of the cutting means.
- a typical cutting process for forming cut lines is open cutting "wherein the open Schnit may be embodied for example as a substantially straight cutting line. In a closed section, two cuts are made at the same time "so forcibly recorded the opposite sides of the workpiece, such as when punching. In this case, the workpiece clamp is not single but two-sided. Then stay the
- Cutting areas appear in appearance.
- the effects mentioned are unavoidable. Therefore, it is particularly advantageous » to reduce the at least second prebending angles of the opposing cutting locations, for example by at least one third.
- the method is a one-step method.
- the area of the contact surface is preferably the cutting edge of the second
- Cutting means from the highest point of the convex portion on which the workpiece rests, spaced. In conjunction with said depression (sloping region), the level of the cutting edge is deeper, so that neither the cutting edge of the first cutting means nor the cutting edge of the second cutting means is in contact with the workpiece during the execution of the second pre-bend.
- the cutting angle of the cutting edge of the first cutting means is formed as an obtuse angle, which means that the adjacent contact surface is obliquely to the general workpiece position.
- the surface which adjoins the cutting edge of the first cutting means and hits the workpiece during pre-bending / cutting is formed obliquely, wherein it is not necessary for the entire surface to have such a shape.
- crack initiation in the cutting area occurred earlier than in the conventional concepts of the prior art and thus to reduce the compressive stresses on the cutting edge.
- the blunt cutting angle and the lead (abutment surface) with respect to the cutting edge are preferably selected so that the tensile stress in the workpiece to be cut on the cutting contour has barely reached the typical material tensile strength when the cutting edge of the first cutting means is on the workpiece impinges to cut the workpiece.
- the bevel has an angle of 8 ° relative to the flat workpiece position, or in other words, the obtuse angle of the cutting edge of the first cutting means is for example 98 °.
- the first cutting edge and / or the second cutting edge at an obtuse angle wherein in the case of the open section, the angle of the first cutting edge preferably corresponds to the second cutting edge.
- the cutting edge angles therefore have values above 90 °, in particular between 95 ° and 110 °, which prolongs the service life of the cutting edges.
- the first cutting edge and / or the second cutting edge at an obtuse angle wherein in the case of the closed section, the angle of the first
- Cutting edge is preferably smaller than the angle of the second cutting edge.
- the first and / or the second cutting edge is rounded, wherein the first and / or the second cutting edge in particular a defined rounding (radius of the
- Cutting edge preferably rounded in the range between 0.01 and 1 mm.
- the cutting edges are rounded differently, more preferably, the first cutting edge is smaller rounded compared to the second cutting edge, preferably the first cutting edge with 0.05 mm and the second cutting edge with 0.1 mm rounded.
- Cutting device provides for an enlargement of the contact zone between the cutting edge and the workpiece and thus for an optimized distribution of the force with effect on the local stresses during penetration of the tip into the workpiece surface. This reduces the surface pressure on the tool and thus reduces the stresses. This can be a further improvement of
- Cutting device is provided between the tool holder and the first cutting means a gap, wherein the gap is preferably selected so large that the tool holder is located behind the highest point of the convex portion of the contact surface. This embodiment ensures that, in particular during the first pre-bending of the workpiece, the non-clamped area can lift upwards more or less from the contact surface of the second cutting means.
- the tool holder is preferably complementary and / or offset from the shape of the contact surface of the second cutting means, preferably around the workpiece thickness educated.
- the workpiece holder preferably has the shape of the contact surface of the second cutting means as a convex offset to the contact surface.
- the convex curvature of the workpiece holder is preferably open in the direction of the cutting location forward. This configuration, in conjunction with the particular underlying second cutting edge for 'that the workpiece until reaching the desired pre-bending no contact with the second cutting edge of the second cutting means gets
- the device according to the invention can be integrated in thermoforming and trimming operations of a press or be implemented singularly in a guillotine.
- the device according to the invention can advantageously be used integrated in a guillotine cutter or in a cutting tool.
- Fig. 1 is a full section of an embodiment of an inventive
- FIG. 2 shows a full section of the device in a schematic representation during the method step clamping and the introduction of a first pre-bend in the workpiece to be cut
- FIG. 3 is a full sectional view of the device in a schematic representation during the placement of the first cutting means to one
- FIG. 4 shows a full section of the device in a schematic representation during the further lowering of the first cutting means and the introduction of a second pre-bend in the workpiece to be cut
- FIG. 6 shows a full section of the device in a schematic representation immediately after the process step cutting
- FIG. 7 shows a full section of the device in a schematic illustration during the process step.
- Fig. 1 shows a full section of an embodiment of a device according to the invention in a schematic representation during the process step insert.
- the device performs an embodiment of a method according to the invention.
- the device has a first upper mold half 1 with a first cutting means 11 in the form of an upper knife, which comprises a first cutting edge 111 and a contact surface 112, and a workpiece holder 12 in the form of a hold-down.
- the device has a second tool half 2 with a second cutting means 21 in the form of a lower blade, which comprises a second cutting edge 211 and a contact surface 212.
- the first upper mold half 1 with a first cutting means 11 in the form of an upper knife, which comprises a first cutting edge 111 and a contact surface 112, and a workpiece holder 12 in the form of a hold-down.
- the device has a second tool half 2 with a second cutting means 21 in the form of a lower blade, which comprises a second cutting edge 211 and a contact surface 212.
- Tool half 1 preferably consists of a solid as possible, lowerable composite part, which is lowered in a substantially vertical movement.
- the workpiece holder 12 and the first cutting means 11, wherein the first cutting edge 111 adjoins the contact surface 112, are separated from one another vertically lowerable.
- the second tool half 2 is substantially in one piece, wherein the second cutting edge 211 adjoins the contact surface 212, which has a convex portion 213 aul Vietnamese.
- the first mold half 1 preferably has not shown
- a workpiece 3 is inserted in the form of a sheet metal blank.
- the abutment surface 212 of the second cutting means 21 rises from a substantially planar level, in particular the region facing away from the cutting edge 211 (right part of the second cutting means 21) forms, in particular near or in the cutting edge 211 facing region (left part of second cutting means 21), a convex portion and falls to the second cutting edge 211 of the second cutting means 21 out again.
- the abutment surface 112 of the first cutting means H is essentially coming from a plane level, in particular the area facing away from the cutting edge 111 (left part of the first cutting means 11), and goes into an inclined area, in particular near or in the cutting edge 111 facing area (left part the first cutting means 11), over.
- the described bending stresses produce an increasing, particularly high bending tensile stress in the region of the cutting contour to be produced, both in the area of action of the first and the second cutting means 11, 21. With further downward movement, the tensile stress increases, the tensile stress generated being preferably smaller than the tensile strength of the workpiece or this may preferably be close.
- the first and second cutting edges 111, 211 strike the workpiece 3 and begin to apply a shear stress to it.
- the shear stress results together with the introduced
- Cutting edges and associated with low tool wear are achieved.
- the illustrated cutting device is integrated into the already required deep-drawing and trimming operations of a press.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Shearing Machines (AREA)
- Nonmetal Cutting Devices (AREA)
- Milling, Broaching, Filing, Reaming, And Others (AREA)
- Turning (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102018112056.7A DE102018112056B9 (de) | 2018-05-18 | 2018-05-18 | Verfahren und Vorrichtung zum Schneiden eines Werkstücks |
PCT/EP2019/059785 WO2019219315A1 (de) | 2018-05-18 | 2019-04-16 | Verfahren und vorrichtung zum schneiden eines werkstücks |
Publications (1)
Publication Number | Publication Date |
---|---|
EP3793759A1 true EP3793759A1 (de) | 2021-03-24 |
Family
ID=66223732
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP19718340.3A Withdrawn EP3793759A1 (de) | 2018-05-18 | 2019-04-16 | Verfahren und vorrichtung zum schneiden eines werkstücks |
Country Status (6)
Country | Link |
---|---|
US (1) | US11938577B2 (de) |
EP (1) | EP3793759A1 (de) |
CN (1) | CN112188943B (de) |
DE (1) | DE102018112056B9 (de) |
MX (1) | MX2020012104A (de) |
WO (1) | WO2019219315A1 (de) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102022133478A1 (de) | 2022-12-15 | 2024-06-20 | Thyssenkrupp Ag | Verfahren und Vorrichtung zum Blechabkanten oder Blechschneiden mit verringerter Flitterbildung |
Family Cites Families (13)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE2739825C3 (de) | 1977-09-03 | 1981-05-14 | Lindemann Maschinenfabrik GmbH, 4000 Düsseldorf | Schrottschere |
JPS57205016A (en) * | 1981-06-15 | 1982-12-16 | Nissan Motor Co Ltd | Cutting press |
EP0082237A1 (de) | 1981-12-23 | 1983-06-29 | Franz Mitterbauer | Vorrichtung zum Zerteilen von Fahrzeugreifen, insbesondere von Lastfahrzeugen |
JPS58149124A (ja) * | 1982-02-26 | 1983-09-05 | Nissan Motor Co Ltd | せん断型 |
US5992275A (en) * | 1997-12-05 | 1999-11-30 | Lindab Ab | Pipe cutter having non-rotating, overlapping knives |
CA2568685A1 (en) * | 2004-06-02 | 2005-12-22 | Stefan Fellenberg | Method and device for cutting high-tensile sheet metal, and press |
DE102005021027B4 (de) | 2004-08-05 | 2009-07-02 | Schuler Pressen Gmbh & Co. Kg | Verfahren zum Schneiden von hochfesten Werkstücken und Vorrichtung zum Durchführen des Verfahrens |
WO2008144893A1 (en) | 2007-05-25 | 2008-12-04 | Magna International Inc. | Integrated die trim and method |
FR2978686B1 (fr) * | 2011-08-03 | 2013-08-09 | Peugeot Citroen Automobiles Sa | Dispositif de decoupe d'une bande de tole et presse de decoupe et d'emboutissage comportant un tel dispositif. |
DE102014100645B4 (de) * | 2014-01-21 | 2018-11-22 | Thyssenkrupp Ag | Werkzeug zum Scherschneiden und Verfahren |
JP6314925B2 (ja) * | 2015-07-21 | 2018-04-25 | マツダ株式会社 | プレス加工装置 |
JP6874534B2 (ja) * | 2016-06-03 | 2021-05-19 | 日本製鉄株式会社 | プレス成形品の製造方法及びプレス装置 |
DE102017103906A1 (de) | 2017-02-24 | 2018-08-30 | Thyssenkrupp Ag | Verfahren und Vorrichtung zum Schneiden eines Werkstücks |
-
2018
- 2018-05-18 DE DE102018112056.7A patent/DE102018112056B9/de active Active
-
2019
- 2019-04-16 CN CN201980033315.7A patent/CN112188943B/zh active Active
- 2019-04-16 US US17/055,670 patent/US11938577B2/en active Active
- 2019-04-16 WO PCT/EP2019/059785 patent/WO2019219315A1/de active Application Filing
- 2019-04-16 MX MX2020012104A patent/MX2020012104A/es unknown
- 2019-04-16 EP EP19718340.3A patent/EP3793759A1/de not_active Withdrawn
Also Published As
Publication number | Publication date |
---|---|
US20230182244A1 (en) | 2023-06-15 |
CN112188943B (zh) | 2023-11-21 |
US11938577B2 (en) | 2024-03-26 |
MX2020012104A (es) | 2021-01-29 |
DE102018112056B4 (de) | 2022-04-28 |
WO2019219315A1 (de) | 2019-11-21 |
CN112188943A (zh) | 2021-01-05 |
DE102018112056A1 (de) | 2019-11-21 |
DE102018112056B9 (de) | 2022-07-21 |
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