WO2010112496A1 - Molette de coupe revêtue - Google Patents

Molette de coupe revêtue Download PDF

Info

Publication number
WO2010112496A1
WO2010112496A1 PCT/EP2010/054176 EP2010054176W WO2010112496A1 WO 2010112496 A1 WO2010112496 A1 WO 2010112496A1 EP 2010054176 W EP2010054176 W EP 2010054176W WO 2010112496 A1 WO2010112496 A1 WO 2010112496A1
Authority
WO
WIPO (PCT)
Prior art keywords
cutting
cutting wheel
coating
flank surfaces
recesses
Prior art date
Application number
PCT/EP2010/054176
Other languages
German (de)
English (en)
Inventor
Heinrich Ostendarp
Original Assignee
Bohle 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 Bohle Ag filed Critical Bohle Ag
Publication of WO2010112496A1 publication Critical patent/WO2010112496A1/fr

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Classifications

    • C—CHEMISTRY; METALLURGY
    • C03—GLASS; MINERAL OR SLAG WOOL
    • C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
    • C03B33/00—Severing cooled glass
    • C03B33/10—Glass-cutting tools, e.g. scoring tools
    • C03B33/105—Details of cutting or scoring means, e.g. tips
    • C03B33/107—Wheel design, e.g. materials, construction, shape
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B28—WORKING CEMENT, CLAY, OR STONE
    • B28D—WORKING STONE OR STONE-LIKE MATERIALS
    • B28D1/00—Working stone or stone-like materials, e.g. brick, concrete or glass, not provided for elsewhere; Machines, devices, tools therefor
    • B28D1/22—Working stone or stone-like materials, e.g. brick, concrete or glass, not provided for elsewhere; Machines, devices, tools therefor by cutting, e.g. incising
    • B28D1/225—Working stone or stone-like materials, e.g. brick, concrete or glass, not provided for elsewhere; Machines, devices, tools therefor by cutting, e.g. incising for scoring or breaking, e.g. tiles

Definitions

  • the invention relates to a cutting wheel, in particular for glass and / or ceramic cutting devices, consisting of a first material having a cutting edge, which is formed by a contact line of two wedge-shaped in cross-section flank surfaces, wherein the flank surfaces production-related unevenness in the form of protrusions and depressions in have the first material, and wherein at least on the cutting edge and axially adjacent portions of the flank surfaces, a coating material is applied.
  • the invention further relates to a glass and / or ceramic cutting device and to a method for producing a coated cutting wheel.
  • Cutting wheels of the type mentioned are known from the prior art.
  • the patent application WO 2004/101455 A1 discloses a cutting wheel made of hard metal whose cutting edge and cutting edges are polished so that the unevennesses have widths of less than one micrometer. Thereafter, a coating of a hard material is applied to the polished areas - for example with elements of the IV and V main group of the periodic table. The coating is intended in particular to reduce the wear of the cutting edge and to make the cutting wheel suitable for cutting materials with different properties.
  • the coating known from WO 2004/101455 A1 makes the cutting edge with the coating material covered. It may happen that the pointed inlet of the cutting edges of the carbide cutting wheel is not accurately replicated by the coating at this point, but that the top of the coating is rounded in contrast. Thus, although a reduction in wear of the cutting wheel can be achieved, however, the cutting result is affected by this change in the cutting edge shape. Although the pointed inflow of the coating can be restored by reworking the coating, the expense of producing a cutting wheel is increased by such reworking, in particular due to the additional work steps on the one hand and due to the abraded material on the other hand.
  • a cutting wheel made of hard metal is again known, which is coated at least on the cutting edge with a polycrystalline diamond-containing layer.
  • This technique also serves to reduce the cutting wheel wear, resulting in an extension of the service life.
  • the layer of polycrystalline diamond is a very expensive and very brittle material with a comparatively high risk of demolition if the cutting wheel coated therewith strikes against a hard material. Furthermore, the results also in the diamond coating
  • the present invention is the
  • Task is based on specifying a cutting wheel with which at the same time reduced production costs Improve the cutting result and extend the tool life.
  • the invention is further based on the object to propose a glass and / or ceramic cutting device and a method for producing a coated cutting wheel.
  • the object is achieved with a cutting wheel according to the preamble of patent claim 1, characterized in that the recesses on the cutting edge and the axially adjacent portions of the flank surfaces through the
  • Coating material are leveled at least approximately to the height of the projections.
  • the cutting result can be improved if the production in a first material of the cutting wheel, for example by grinding processes, existing depressions are "filled" with a coating material, so that preferably the projections and the leveled, ie filled, wells are approximately at the same height level.
  • a coating material for example a glass or ceramic plate, which in turn is connected to a more homogeneous stress distribution in the cutting wheel and in the workpiece to be cut. It follows that the probability of occurrence of stress peaks in the cutting edge and in the surface of the cut
  • a further reduction of the susceptibility to wear results from the fact that the advantageous interaction of the very precise cutting edge and the very flat flank surfaces with the workpiece to be cut, the force with which the cutting wheel must be pressed against the workpiece to be cut to the with the Cracking effect generated, desired depth of cut in the workpiece to be cut, compared to an uncoated cutting wheel can reduce.
  • This reduced susceptibility to wear has the effect that the service life of such a coated cutting wheel can be extended by about a factor of five to ten over uncoated carbide cutting wheels.
  • the coating material forms with the contrast harder first material of the cutting wheel a special material complex, which solidifies the structure of the cutting wheel by the better force distribution or the more homogeneous contact zone between the cutting wheel and the workpiece to be cut in combination with the reduced contact force against uncoated cutting wheels, thus a higher wear resistance leads. This will make the coated cutter wheel over an extended period of time kept usable, so that a prolonged life of the coated cutting wheel is achieved.
  • the coating material has a lower hardness compared to the first material.
  • a filling of the production-related grooves is easily possible without the cutting wheel shape so it is changed.
  • the above described solidification effect is particularly pronounced in such a pairing of materials.
  • the first material may comprise a hard metal.
  • Tungsten carbide for example, which is admixed with 3 to 3% by weight of cobalt, and which has unavoidable impurities of at most about 0.5% by weight, is suitable.
  • the grain size of this alloy can be approximately between 0.5 and 0.8 microns.
  • the cobalt content of the tungsten carbide material can also be increased to 6 wt%. With otherwise identical properties, the Vickers hardness then results in about 1820.
  • the coating material may comprise titanium nitride, for example.
  • the thickness of the coating can be adapted to the height differences between the projections and the depressions, in particular between 0.5 and 3 ⁇ m, preferably 1.5 to 2 ⁇ m.
  • a structure in the form of, in particular regularly arranged, recesses may be provided along the cutting wheel circumference.
  • Such configurations of the cutting edge of a cutting wheel are known, for example, from the utility model DE 20 2007 013 306 U1, which is also based on the patent applicant. Due to the structure along the cutting wheel circumference, the cutting wheel, while it is guided over the workpiece to be cut, so rolls, exert an alternating contact force on the workpiece to be cut. The contact pressure is reduced in particular with respect to the portions of the workpiece to be cut, which lie opposite a recess in the cutting wheel circumference during the rolling process.
  • the pressing force is increased where a tooth on the cutting wheel periphery comes in contact with the corresponding portions of the workpiece to be cut during the rolling operation.
  • the cutting result can be improved due to the special nature of the introduction of force into the workpiece to be cut become.
  • the service life of a cutting wheel provided with a recess structure disclosed in DE 20 2007 013 306 U1 can be increased by approximately a factor of 1.5 compared with structured carbide cutting wheels known from practice (eg EP 0 773 194 B1).
  • Recesses may also be coated or uncoated.
  • a cutting edge formed by two cross-sectional wedge-shaped tapered second flank surfaces may be formed in the recesses.
  • a cutting edge can also be formed in the region of the recesses on the cutting wheel circumference, so that overall there is a cutting edge running along the circumference of the cutting wheel.
  • a scoring effect can be achieved when the cutting wheel is pressed in a height difference between the teeth and recesses exceeding degree in the workpiece to be cut.
  • the coating material is then applied at least to the cutting edge and axially adjacent portions of the second flank surfaces.
  • the coating can be applied at least to the wear region of the cutting wheel and the axially adjacent sections of the flank surfaces. Since a coating improves the interaction between the coated cutting wheel and the workpiece to be cut, it is expedient to coat the coating in the wear region of the coated article
  • Cutting wheel ie where the cutting edge and the axially adjacent portions of the flank surfaces in the zu deeply penetrate cutting work, apply.
  • a method for producing a coated cutting wheel comprising the following steps: providing a cutting edge having a cutting wheel of a first material, wherein the cutting edge is formed by a Beruhrungsline two in cross section wedge-shaped tapered flank surfaces, and wherein the flank surfaces production-related unevenness in the form of projections and depressions in the first material. Applying a Be slaughterungsmate ⁇ als at least on the cutting edge and axially adjacent portions of the flank surfaces, so that the recesses are leveled at the cutting edge and the axially adjacent portions of the flank surfaces by the Be istungsmatenal at least approximately to the height of the projections.
  • the leveling, so "filling", the wells can be made specifically.
  • a Coating material on the cutting wheel of a comparatively harder first material - as already explained in the comments on the cutting wheel according to the invention - a material complex is formed, which solidifies the structure of the cutting wheel surface and thus to a higher wear resistance, along with an increased life of the thus coated cutting wheel leads ,
  • the cutting edge is deburred by suitable measures before coating. In this way, even before the coating, a higher degree of precision can be achieved at the cutting edge.
  • the coating then essentially serves to fill the depressions to the height of the projections which have not been leveled by the preceding deburring operation.
  • not removed and subsequently coated burrs, in particular at the cutting edge have a negative influence on the wear resistance.
  • the coating can be applied with a thickness which has an excess compared to the height differences between the projections and the recesses. In this way, in particular the requirements for the precision of the coating process can be reduced.
  • the coating can be applied at least to the wear region of the cutting edge and the portions of the flank surfaces which abut it axially. That way that can
  • Coating material can be used economically.
  • the coating can be applied by means of physical and / or plasma-assisted chemical vapor deposition.
  • These coating processes allow, in particular, the coating also with temperature-sensitive materials and ensure the application of the coating material with largely homogeneous layer thicknesses even on complex-shaped substrates.
  • a structure in the form of recesses can be incorporated into the cutting wheel along the circumference of the cutting wheel before or after coating.
  • the recesses can be arranged regularly but also irregularly on the cutter wheel circumference.
  • the recesses can be introduced, for example by means of grinding or laser machining in the cutting wheel, as for example from the also going back to the patent applicant
  • the recesses are incorporated into the cutting wheel after coating, the area of the recesses remain uncoated because of the likewise removed coating material or in a second
  • Coating step to be recoated As a result, the area of the recesses can also be coated.
  • Cutting wheel affects.
  • the self-sharpening effect is achieved by subjecting the regions of the cutting edge (recesses) in the uncoated state a priori to a greater tendency to wear than the radially projecting, coated regions (teeth), which, although in a more intimate contact with the workpiece to be cut come, but are better protected from wear by the coating. This is obviously the geometry preservation of the cutting edge.
  • Fig. 3 is an enlarged view of the coated
  • Fig. 4a-b is an enlarged view of possible shapes of the projections and depressions on the coated
  • Fig. 5 is an isometric view of a
  • Embodiment of a cutting wheel which is provided along its Un ⁇ fangs with recesses.
  • Figure 1 shows an embodiment of a cutting wheel 2 in a front view.
  • the cutting wheel 2 can be rotatably supported in this example by means of a pin 4 about a rotation axis 6.
  • the cutting wheel 2 further comprises two parallel and perpendicular to the axis of rotation 6 extending side surfaces 8a, 8b.
  • the side surfaces 8a, 8b go into flank surfaces 10a, 10b, which touch each other at a certain angle, for example of 135 °, in a line 12 (extending in Figure 1 in the drawing plane).
  • two flank surfaces 10a, 10b run wedge-shaped towards each other, whereby along the circumference of the cutting wheel 2, a cutting edge 14 is formed.
  • the cutting edge 14 is pressed during the cutting of brittle materials such as glass or ceramic by means of a device (not shown) on which the cutting wheel 2 is mounted against the workpiece 16 to be cut (force arrow F) and rolls on the workpiece surface.
  • FIG. 2a shows an enlarged section of the cutting edge 14 of the embodiment of the cutting wheel 2 shown in FIG. 1.
  • the flank surfaces 10a, 10b have production-related unevennesses in the form of projections 18 and depressions 20.
  • the differences in height between projections 18 and recesses 20 may, depending on the selected machining accuracy at 0.5 to 3.0 microns, in particular between 1.5 and 2 microns, are.
  • the width of a recess 20 arranged between two protrusions 18 may be of the same order of magnitude.
  • Such unevenness can be caused for example by a grinding tool in the shaping of the cutting edge 14 and the adjoining portions of the flank surfaces 10a, 10b.
  • the contact zone of the cutting wheel 2 is reduced with the workpiece 16 to be cut during the cutting process.
  • This may have an effect on the cutting process in that, due to the imperfect contact along the cutting line, stress peaks occur in the material of the workpiece 16 to be cut and also in the cutting wheel surface. This can lead to fine, the quality of the breaking edge along the cutting line during the separation process of the workpiece 16 to be cut interfering material splitter, such as glass or ceramic splinters arise, and that the wear of the cutting wheel 2 is increased.
  • Figure 2b shows how the cutting wheel 2 can be formed so that the cutting result, in particular the good of the breaking edge, is improved.
  • the cutting edge 14 Prior to coating, the cutting edge 14 is preferably deburred to provide a greater degree of flatness of the surfaces involved and to remove protruding burrs, particularly at the cutting edge, which promote accelerated wear.
  • a coating material 22 is applied to the cutting edge 14 and portions of the flank surfaces 10a, 10b which bear against it axially.
  • the coating material 22 may be softer than the first material of the cutting wheel 2. Titanium nitride can be used in particular as the coating material 22.
  • the wear region of the cutting wheel 2 and the flank surfaces 10a, 10b ie the region which comes into contact with the workpiece 16 to be cut during the cutting process, is provided with the coating 22.
  • the wear region can be, for example, in the range between 10 and 50 ⁇ m, in particular between 20 and 30 ⁇ m (measured parallel to the axis of rotation 6), ie +/- 5 or 25 ⁇ m , in particular between +/- 10 and 15 microns, around the cutting edge 14 around.
  • the physical vapor deposition can be used. Physical vapor deposition can be carried out at very low process temperatures, allowing coating with temperature sensitive materials. Additionally or alternatively, the coating 22 can also by means of a plasma-enhanced chemical
  • Gas phase deposition can be applied.
  • This aforementioned coating method has in common that with them also complex shaped substrates can be covered with a coating 22 having a substantially homogeneous layer thickness.
  • other suitable coating methods can also be used.
  • the coating 22 is applied with a thickness which has an excess compared with the differences in height between the projections 18 and the recesses 20 (shown slightly coated in FIG. 2 b for clarity). In this way it can be ensured that each recess 20 in the region to be coated on the cutting edge 14 is at least "filled up" to the height of the surrounding projections 18.
  • the portions of the coating 22 projecting beyond the projections 18 are removed until a contact of the cutting wheel 2, which is made, for example, from a hard metal such as tungsten carbide, with the hard workpiece 16 is possible.
  • the coating 22 is removed, for example, except for the line 24 indicated in FIG. 2c (compare arrows 40).
  • the recesses 20 on the cutting edge 14 and the axially adjacent portions of the flank surfaces 10a, 10b then remain at least approximately filled in further use of the cutting wheel 2 with the coating material and ensure during a cutting process that the cutting wheel 2 a homogeneous contact zone with the workpiece to be cut 16 has.
  • FIG. 3 shows a cutting edge 14 and sections of the flank surfaces 10a, 10b on which the coating material has been applied with oversize, the coating 22 having been removed so far in a wear region that the filled-in depressions 20 with the projections 18 are at least approximately form a flat surface.
  • the coating 22 extends in the example shown in Figure 3 in the axial direction over the
  • FIG. 4a shows, in an enlarged view, a detail of one of the wedge-shaped tapering flank surfaces 10a, 10b of an exemplary embodiment of the cutting wheel 2 with projections 18 and depressions 20 in the coated state.
  • Example of Figure 4a the heights of the projections 18 are approximately at the same level, so that with the Coating 22 results in a largely flat level line 26.
  • Figure 4b shows a similar view as in Figure 4a, but in which the projections 18 are at different levels, so that with the coating 22 a slightly wavy level line 26 'results. But even this corrugated shape ensures the advantage of a more homogeneous contact zone between the cutting wheel 2 and the workpiece 16 to be cut.
  • Figure 5 shows a section of an embodiment of a cutting edge 14.
  • the cutting wheel 2 is provided along its circumference with, in this example regularly arranged recesses 28.
  • the recesses 28 can also be arranged irregularly, as known from the utility model DE 20 2007 013 306 Ul in principle.
  • Application can thus structured cutting wheels 2, for example, in the separation of display glass, especially high-quality glasses of TFT screens, find.
  • a cutting edge 14 is formed in the recesses 28 by two, second flank surfaces 30a, 30b tapered in the shape of a wedge.
  • the coating 22 is not shown in the embodiment shown in Figure 5 for the sake of clarity. However, the coating 22 may be applied to both the teeth 32 and recesses 28, as well as only on the teeth 32 of the cutting wheel 2. The latter may arise, for example, from the manufacturing process, if the recesses 28 after the coating process in the scope of the cutting wheel 2 are incorporated.
  • the coating 22 therefore has the advantage that, in particular with specially structured cutting wheels 2 made of hard metal, which are characterized by excellent cutting properties, especially in thin workpieces, such as glasses, due to improved cutting edge quality, a significant reduction of wear and, consequently, a prolonged service life is achieved ,

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Materials Engineering (AREA)
  • Organic Chemistry (AREA)
  • Mining & Mineral Resources (AREA)
  • Mechanical Engineering (AREA)
  • Cutting Tools, Boring Holders, And Turrets (AREA)

Abstract

L'invention concerne une molette de coupe (2), en particulier pour des dispositifs de coupe du verre et/ou de la céramique, comprenant un premier matériau présentant une arête de coupe (14), qui est formée par une ligne de contact (12; 12b) de deux surfaces de flanc (10a, 10b; 30a, 30b) se terminant, en section, en forme de coin, les surfaces de flanc (10a, 10b) présentant des inégalités, dues à la fabrication, en forme de saillies (18) et de creux (20) dans le premier matériau, cependant qu'un matériau de revêtement (22) est appliqué au moins sur l'arête de coupe (14) et les sections axialement adjacentes des surfaces de flanc (10a, 10b). L'invention a pour but de fournir une molette de coupe permettant d'améliorer les résultats de coupe et de prolonger la durée de vie de l'outil, tout en réduisant en même temps les frais de fabrication. Ce but est atteint, conformément à l'invention, laquelle est caractérisée en ce que les creux (20) sur l'arête de coupe (14) et sur les sections axialement adjacentes des surfaces de flanc (10a, 10b), sont nivelés par le matériau de revêtement (22), au moins approximativement à la hauteur des saillies (18). L'invention concerne en outre un dispositif de coupe de verre et/ou de céramique, ainsi qu'un procédé de production d'une molette de coupe revêtue.
PCT/EP2010/054176 2009-03-30 2010-03-30 Molette de coupe revêtue WO2010112496A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102009014867 2009-03-30
DE102009014867.1 2009-03-30

Publications (1)

Publication Number Publication Date
WO2010112496A1 true WO2010112496A1 (fr) 2010-10-07

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PCT/EP2010/054176 WO2010112496A1 (fr) 2009-03-30 2010-03-30 Molette de coupe revêtue

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WO (1) WO2010112496A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20120312141A1 (en) * 2011-06-08 2012-12-13 Tomei Naoko Scribing wheel, method for manufacturing the scribing wheel, and scribing method

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19753092A1 (de) 1997-11-29 1999-06-10 Keipke Roy Dipl Ing Mit einem Diamantfilm beschichtetes Schneidrad
EP0773194B1 (fr) 1995-11-06 2001-07-04 Mitsuboshi Diamond Industrial Co., Ltd. Molette à couper le verre
WO2004101455A1 (fr) 2003-05-16 2004-11-25 Hegla Fahrzeug- Und Maschinenbau Gmbh & Co. Kg Roulette de coupe-verre
DE202007013306U1 (de) 2007-09-22 2008-04-24 Bohle Ag Schneidrädchen
DE202007013307U1 (de) * 2007-09-22 2008-04-24 Bohle Ag Schneidrädchen
DE102007045383A1 (de) 2007-09-22 2008-07-17 Bohle Ag Verfahren zur Herstellung von Schneidrädchen

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0773194B1 (fr) 1995-11-06 2001-07-04 Mitsuboshi Diamond Industrial Co., Ltd. Molette à couper le verre
DE19753092A1 (de) 1997-11-29 1999-06-10 Keipke Roy Dipl Ing Mit einem Diamantfilm beschichtetes Schneidrad
WO2004101455A1 (fr) 2003-05-16 2004-11-25 Hegla Fahrzeug- Und Maschinenbau Gmbh & Co. Kg Roulette de coupe-verre
DE202007013306U1 (de) 2007-09-22 2008-04-24 Bohle Ag Schneidrädchen
DE202007013307U1 (de) * 2007-09-22 2008-04-24 Bohle Ag Schneidrädchen
DE102007045383A1 (de) 2007-09-22 2008-07-17 Bohle Ag Verfahren zur Herstellung von Schneidrädchen

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
"Fine and ultrafine hardmetals carve niche", METAL POWDER REPORT, MPR PUBLISHING SERVICES, SHREWSBURY, GB, vol. 52, no. 4, 1 April 1997 (1997-04-01), pages 16,18 - 22, XP004287437, ISSN: 0026-0657 *

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20120312141A1 (en) * 2011-06-08 2012-12-13 Tomei Naoko Scribing wheel, method for manufacturing the scribing wheel, and scribing method
US20140366701A1 (en) * 2011-06-08 2014-12-18 Mitsuboshi Diamond Industrial Co., Ltd Scribing wheel, method for manufacturing the scribing wheel, and scribing method
US9149953B2 (en) * 2011-06-08 2015-10-06 Mitsuboshi Diamond Industrial Co., Ltd. Scribing wheel, method for manufacturing the scribing wheel, and scribing method
JP2015180548A (ja) * 2011-06-08 2015-10-15 三星ダイヤモンド工業株式会社 スクライビングホイール及びスクライブ方法
US9827691B2 (en) * 2011-06-08 2017-11-28 Mitsuboshi Diamond Industrial Co., Ltd. Scribing wheel, method for manufacturing the scribing wheel, and scribing method

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