WO1998057785A1 - Circular blade - Google Patents

Circular blade Download PDF

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Publication number
WO1998057785A1
WO1998057785A1 PCT/DE1998/001615 DE9801615W WO9857785A1 WO 1998057785 A1 WO1998057785 A1 WO 1998057785A1 DE 9801615 W DE9801615 W DE 9801615W WO 9857785 A1 WO9857785 A1 WO 9857785A1
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WO
WIPO (PCT)
Prior art keywords
coating
circular knife
hard material
circular
knife according
Prior art date
Application number
PCT/DE1998/001615
Other languages
German (de)
French (fr)
Inventor
Horst KÖHNEN
Original Assignee
Rasspe International Gmbh & 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
Application filed by Rasspe International Gmbh & Co. Kg filed Critical Rasspe International Gmbh & Co. Kg
Publication of WO1998057785A1 publication Critical patent/WO1998057785A1/en

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Classifications

    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C28/00—Coating for obtaining at least two superposed coatings either by methods not provided for in a single one of groups C23C2/00 - C23C26/00 or by combinations of methods provided for in subclasses C23C and C25C or C25D
    • C23C28/04—Coating for obtaining at least two superposed coatings either by methods not provided for in a single one of groups C23C2/00 - C23C26/00 or by combinations of methods provided for in subclasses C23C and C25C or C25D only coatings of inorganic non-metallic material
    • C23C28/044—Coating for obtaining at least two superposed coatings either by methods not provided for in a single one of groups C23C2/00 - C23C26/00 or by combinations of methods provided for in subclasses C23C and C25C or C25D only coatings of inorganic non-metallic material coatings specially adapted for cutting tools or wear applications
    • 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
    • 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
    • B26D1/12—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 cutting member moving about an axis
    • B26D1/14—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 cutting member moving about an axis with a circular cutting member, e.g. disc cutter
    • 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
    • B26D2001/002—Materials or surface treatments therefor, e.g. composite materials
    • 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
    • B26D2001/0046—Cutting members therefor rotating continuously about an axis perpendicular to the edge

Definitions

  • the invention relates to a circular knife of the type corresponding to the preamble of claim 1.
  • circular knife is intended on the one hand to encompass circular-shaped knives in which the cutting edge or (in the case of toothed cutting edges) the envelope of the cutting edge is a circle which is coaxial with the axis of the circular disc forming the axis of rotation (DE 40 31 671 C2 and DE-GM 71 16,979).
  • rotating knives should also be included, in which the radius of the cutting edge is not constant over the circumference, e.g. with a spiral knife
  • Circular knives of this type are used in cutting machines for sausages, cheese and the like, which are used in the private sector, but predominantly in the industrial sector, for example in butchers, delicatessens, supermarkets and in particular in sausage and cheese factories, in order to produce sliced portions.
  • the circular knives are usually rotatably mounted in a fixed housing, and the clippings are guided radially from the outside against the circular knife on a slide that is movable perpendicular to the axis of rotation of the circular knife.
  • the circular knife In industrial cutting machines, however, the circular knife is also moved perpendicular to its axis of rotation. Only the relative movement is decisive.
  • the cut material lies with its end face against a stop surface extending perpendicular to the axis of rotation.
  • the clippings are pressed with a certain force parallel to the axis of rotation against the contact surface and against the adjacent flat side of the circular knife.
  • On this flat side there is wear on the circular knife, which from time to time requires regrinding in the cutting machine or a replacement of the circular knife for reprocessing and regrinding it outside the cutting machine.
  • the associated business interruptions are disruptive.
  • the invention has for its object to reduce the wear of circular knives of the type in question.
  • the radial extension of the annular zone from the outer edge of the circular knife to the inside should be at least 10 mm. Since the food to be cut by the circular knife is a corrosive attack on the basic material of the
  • the coating should consist of a food-resistant hard material (claim 5).
  • a material that can be considered for a coating is tungsten carbide (WC).
  • the further coating can have a surface profile which is smoother than that of the first coating in order to prevent smearing of the material to be cut and the formation of grooved cut surfaces.
  • the further coating preferably also comprises at least one hard material (claim 9).
  • it can comprise a hard material containing titanium and nitrogen, in particular titanium nitride (TiN).
  • TiN titanium nitride
  • Fig. 1 shows a view of a circular knife from the push side
  • Fig. 2 shows a section through the axis on an enlarged scale
  • Fig. 3 shows a corresponding partial section of the Edge region of a modified form of implementation
  • FIG. 4 shows a cross section through a coated surface area on a greatly enlarged scale.
  • the circular knife designated 100 as a whole in FIG. 1 has a circular disk-shaped knife body 1 with a central centering hole 2, with which the circular knife 100 is placed on the shaft or knife holder of the cutting machine.
  • the circular knife is fastened by means of four screws distributed over the circumference, which are screwed into the bores 3, and can then rotate about the axis A of the circular disk.
  • the circular knife 100 is not flat, but rather is dipped into a flat-conical disk which has a ground cutting bevel 4 with a circular cutting edge 8 concentric with the axis A on the outer edge.
  • the push-on side of the circular knife 100 is the concave side and is indicated by the arrow 5 in FIG. 2.
  • annular wear zone 6 the extent of which is indicated in FIG. 1 by the extent of the clip.
  • the circular knife 100 has a coating 10 made of hard metal on the push-on side 5, which is indicated by dots in FIGS. 1 and 2 and extends in an annular zone 7 which extends from the cutting edge 8 on the outer circumference of the Circular knife 100 extends further inwards than the wear zone 6.
  • a circular knife 100 with a circular cutting edge 8, modified in shape is indicated, in which otherwise the same reference numbers are used. The difference from the circular knife 100 is that the circular knife 100 'of FIG.
  • the width of the annular wear zone 6 corresponds to the distance from the shoulder 9 to the cutting edge 8.
  • the loading Layering 10 with the hard metal is also provided in this area, so that here the radial extensions 6 and 7 coincide.
  • FIG. 4 shows the surface area of a knife body 1, on the surface 11 of which the coating with the hard material, designated as a whole by 10, is applied.
  • the total thickness 12 of the coating 10 depends on the individual case, i.e. from the material of the surface supporting the coating 10 and from the chosen method for applying the coating 10 and lies in the
  • the overall coating 10 further comprises a first coating 13 made of tungsten carbide, the surface 14 of which has a certain roughness due to the process.
  • a second coating 15, which consists of TiN and forms a smoother surface 16 is applied to the first coating 13.
  • the aforementioned layer structure is only to be understood as an example.
  • Other suitable hard material coatings also come into consideration, the selection of which in part also depends on the material of the knife body 1.
  • titanium and nitrogen-containing hard material layers are preferred, in particular TiN in various compositions and titanium carbo-nitride.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Forests & Forestry (AREA)
  • Inorganic Chemistry (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Chemical Vapour Deposition (AREA)
  • Physical Vapour Deposition (AREA)

Abstract

The invention relates to a circular blade (100, 100') for cutting foods such as meat products, cheese and similar sliced goods, comprising a steel, disk-shaped blade body (1) which is configured so that it can turn around an axis (A), said axis being perpendicular to the disk plane. The outer rim of said blade body is feather-edged (8) for cutting. The blade body (1) is coated with a hard material in an annular area (7) on the outer edge, in at least the area of a flat surface which is subject to wear. Said coating (10) comprises a first coating (13) of a hard material and at least one other coating of a hard material (15) applied on top of said first coating, the surface profile of the second coating (15) being smoother than that of the first coating (13).

Description

Rundmesser Round knife
Die Erfindung bezieht sich auf ein Rundmesser der dem Oberbegriff des Anspruchs 1 entsprechenden Art.The invention relates to a circular knife of the type corresponding to the preamble of claim 1.
Der Ausdruck "Rundmesser" soll einerseits kreisscheibenförmige Messer umfassen, bei denen die Schneide bzw. (bei gezahnten Schneiden) die Hüllkurve der Schneide ein zu der die Drehachse bildenden Achse der Kreisscheibe koaxialer Kreis ist (DE 40 31 671 C2 bzw. DE-GM 71 16 979). Andererseits sollen aber auch rotierende Messer darunterfallen, bei denen der Radius der Schneide über den Umfang nicht konstant ist wie z.B. bei einem SpiralmesserThe term "circular knife" is intended on the one hand to encompass circular-shaped knives in which the cutting edge or (in the case of toothed cutting edges) the envelope of the cutting edge is a circle which is coaxial with the axis of the circular disc forming the axis of rotation (DE 40 31 671 C2 and DE-GM 71 16,979). On the other hand, rotating knives should also be included, in which the radius of the cutting edge is not constant over the circumference, e.g. with a spiral knife
(DE 38 33 596 C2 oder US-PS 1 957 623).(DE 38 33 596 C2 or US-PS 1 957 623).
Derartige Rundmesser werden in Schneidemaschinen für Wurst, Käse und dergleichen eingesetzt, die im privaten Bereich, jedoch vorwiegend im industriellgewerblichen Bereich, z.B. in Metzgereien, Feinkostgeschäften, Supermärkten und insbesondere in Wurst- und Käsefabriken Verwendung finden, um in Scheiben portioniertes Schnittgut herzustellen. Die Rundmesser sind meist in einem feststehenden Gehäuse drehbar gelagert, und es wird das Schnittgut auf einem senkrecht zur Drehachse des Rundmessers bewegbaren Schlitten radial von außen gegen das Rundmesser geführt. Bei Industrieschneidemaschinen wird jedoch auch das Rundmesser senkrecht zu seiner Drehachse bewegt. Maßgeblich ist lediglich die Relativbewegung. Dabei liegt das Schnittgut mit seiner Stirnseite gegen eine senkrecht zur Drehachse sich erstreckende Anschlagfläche an. Um diese Anlage, die für die Maßhaltigkeit der Scheiben wichtig ist, aufrechtzuerhalten, wird das Schnittgut mit einer bestimmten Kraft parallel zur Drehachse gegen die Anlagefläche und gegen die benachbarte Flachseite des Rundmessers gedrückt. Auf dieser Flachseite entsteht an dem Rund- messer ein Verschleiß, der von Zeit zu Zeit ein Nachschleifen in der Schneidemaschine oder ein Auswechseln des Rundmessers zum Wiederaufarbeiten und Nachschleifen desselben außerhalb der Schneidemaschinen notwendig macht. Die damit einhergehenden Betriebsunterbrechungen sind störend.Circular knives of this type are used in cutting machines for sausages, cheese and the like, which are used in the private sector, but predominantly in the industrial sector, for example in butchers, delicatessens, supermarkets and in particular in sausage and cheese factories, in order to produce sliced portions. The circular knives are usually rotatably mounted in a fixed housing, and the clippings are guided radially from the outside against the circular knife on a slide that is movable perpendicular to the axis of rotation of the circular knife. In industrial cutting machines, however, the circular knife is also moved perpendicular to its axis of rotation. Only the relative movement is decisive. The cut material lies with its end face against a stop surface extending perpendicular to the axis of rotation. In order to maintain this system, which is important for the dimensional accuracy of the discs, the clippings are pressed with a certain force parallel to the axis of rotation against the contact surface and against the adjacent flat side of the circular knife. On this flat side there is wear on the circular knife, which from time to time requires regrinding in the cutting machine or a replacement of the circular knife for reprocessing and regrinding it outside the cutting machine. The associated business interruptions are disruptive.
Der Erfindung liegt die Aufgabe zugrunde, den Verschleiß von Rundmessern der in Rede stehenden Art zu vermindern.The invention has for its object to reduce the wear of circular knives of the type in question.
Diese Aufgabe wird durch die in Anspruch 1 wiederge- gebene Erfindung gelöst.This object is achieved by the invention reproduced in claim 1.
Die Beschichtung mit einem Hartstoff bzw. mit zwei oder mehr Hartstoffschichten gegebenenfalls unterschiedlicher Zusammensetzung und Struktur erhöht die Verschleißfestigkeit des Rundmessers erheblich. Versuche haben um das zwei- bis dreifache verlängerte Standzeiten ergeben. Außerdem zeigt sich ein Selbstschärfeffekt, indem im Betrieb zwar auch auf der der Beschichtungsseite gegenüberliegenden Seite ein Verschleiß, d.h. eine Materialabtragung eintritt, die harte Beschichtung aber im wesentlichen stehenbleibt und an der Schneide auf der gegenüberliegenden Seite fortlaufend freigelegt wird, so daß die Schneide stets von den Eigenschaften der Beschichtung bestimmt und entsprechend scharf bleibt.Coating with a hard material or with two or more hard material layers, possibly with a different composition and structure, increases the wear resistance of the circular knife considerably. Tests have shown that the service life has been extended two to three times. In addition, there is a self-sharpening effect, in that wear and tear occurs on the side opposite the coating side, i.e. material is removed, but the hard coating essentially remains and is continuously exposed on the cutting edge on the opposite side, so that the cutting edge always determined by the properties of the coating and remains accordingly sharp.
Der Verschleiß tritt erfahrungsgemäß in einer bestimmten Zone der Anschiebeseite des Rundmessers auf, und es empfiehlt sich nach Anspruch 2 und 3, die Beschichtung in dieser Zone vorzusehen. Gemäß Anspruch 4 soll die radiale Erstreckung der kreisringförmigen Zone vom äußeren Rand des Rundmessers nach innen mindestens 10 mm betragen. Da die von dem Rundmesser zu schneidenden Lebens it- tel einen korrosiven Angriff auf den das Grundmaterial desExperience has shown that wear occurs in a certain zone of the push-on side of the circular knife, and it is recommended according to claims 2 and 3 to provide the coating in this zone. According to claim 4, the radial extension of the annular zone from the outer edge of the circular knife to the inside should be at least 10 mm. Since the food to be cut by the circular knife is a corrosive attack on the basic material of the
Rundmessers bildenden Stahl ausüben können und insoweit lebensmittelrechtliche Bestimmungen zu beachten sind, sollte die Beschichtung aus einem lebensmittelbeständigen Hartstoff bestehen (Anspruch 5). Ein in Betracht kommendes Material für eine Beschichtung ist Wolfram-Carbid (WC) .Can exercise round knife-forming steel and in so far as food law provisions must be observed, the coating should consist of a food-resistant hard material (claim 5). A material that can be considered for a coating is tungsten carbide (WC).
Es kann sich empfehlen, gemäß Anspruch 7 auf der ersten Beschichtung eine weitere Beschichtung vorzusehen, um die optimalen Eigenschaften hinsichtlich Korrosions- beständigkeit und Schnitthaltigkeit zu erzielen.It can be advisable to provide a further coating on the first coating in order to achieve the optimum properties with regard to corrosion resistance and edge retention.
Die weitere Beschichtung kann gemäß Anspruch 8 ein Oberflächenprofil aufweisen, welches glatter als das der ersten Beschichtung ist, um ein Schmieren des Schnittgutes und die Bildung riefiger Schnittflächen zu unterbinden. Bevorzugt umfaßt die weitere Beschichtung ebenfalls mindestens einen Hartstoff (Anspruch 9).According to claim 8, the further coating can have a surface profile which is smoother than that of the first coating in order to prevent smearing of the material to be cut and the formation of grooved cut surfaces. The further coating preferably also comprises at least one hard material (claim 9).
Sie kann insbesondere einen Titan und Stickstoff enthaltenden Hartstoff umfassen, insbesondere Titan-Nitrid (TiN) . In der Zeichnung ist ein Ausführungsbeispiel derIn particular, it can comprise a hard material containing titanium and nitrogen, in particular titanium nitride (TiN). In the drawing, an embodiment of the
Erfindung dargestellt.Invention shown.
Fig. 1 zeigt eine Ansicht eines Rundmessers von der Anschiebeseite her;Fig. 1 shows a view of a circular knife from the push side;
Fig. 2 zeigt einen durch die Achse gehenden Schnitt in vergrößertem Maßstab;Fig. 2 shows a section through the axis on an enlarged scale;
Fig. 3 zeigt einen entsprechenden Teilschnitt des Randbereichs einer abgewandelten Aus führungsform;Fig. 3 shows a corresponding partial section of the Edge region of a modified form of implementation;
Fig. 4 zeigt einen Querschnitt durch einen beschichteten Oberflächenbereich in stark vergrößertem Maßstab.4 shows a cross section through a coated surface area on a greatly enlarged scale.
Das in Fig. 1 als Ganzes mit 100 bezeichnete Rundmes- ser besitzt einen kreisscheibenförmigen Messerkörper 1 mit einer zentralen Zentrierbohrung 2 , mit welcher das Rundmesser 100 auf die Welle bzw. Messeraufnahme der Schneidemaschine gesetzt wird. Mittels vier über den Umfang verteilter Schrauben, die in die Bohrungen 3 einge- schraubt werden, wird das Rundmesser befestigt und kann dann um die Achse A der Kreisscheibe rotieren.The circular knife designated 100 as a whole in FIG. 1 has a circular disk-shaped knife body 1 with a central centering hole 2, with which the circular knife 100 is placed on the shaft or knife holder of the cutting machine. The circular knife is fastened by means of four screws distributed over the circumference, which are screwed into the bores 3, and can then rotate about the axis A of the circular disk.
Wie aus Fig. 2 ersichtlich ist, ist das Rundmesser 100 nicht flach, sondern zu einer flachkonischen Scheibe gekümpelt, die am äußeren Rand eine angeschliffene Schneidfase 4 mit einer kreisförmigen, zur Achse A konzentrischen Schneide 8 aufweis .As can be seen from FIG. 2, the circular knife 100 is not flat, but rather is dipped into a flat-conical disk which has a ground cutting bevel 4 with a circular cutting edge 8 concentric with the axis A on the outer edge.
Die Anschiebeseite des Rundmessers 100 ist die konkave Seite und in Fig. 2 durch den Pfeil 5 gekennzeichnet. Im radial äußeren Bereich befindet sich eine kreisringför- mige Verschleißzone 6, deren Ausdehnung in Fig. 1 durch die Erstreckung der Klammer angedeutet ist. Mindestens in der Verschleißzone 6 trägt das Rundmesser 100 auf der Anschiebeseite 5 eine Beschichtung 10 aus Hartmetall, die in den Fig. 1 und 2 durch Pünktchen angedeutet ist und sich in einer kreisringförmigen Zone 7 erstreckt, die sich von der Schneidkante 8 am äußeren Umfang des Rundmessers 100 weiter nach innen erstreckt als die Verschleißzone 6. In Fig. 3 ist ein in der Form abgewandeltes Rundmesser 100 mit kreisförmiger Schneide 8 angedeutet, bei dem ansonsten gleiche Bezugszahlen verwendet sind. Der Unterschied zu dem Rundmesser 100 besteht darin, daß bei dem Rundmesser 100' der Fig. 3 auf der konkaven Anschiebeseite ein umlaufender Absatz 9 vorgesehen ist, d.h. der mittlere Teil des Messers etwas zurückspringt. In diesem Fall ent- spricht die Breite der kreisringförmigen Verschleißzone 6 dem Abstand von dem Absatz 9 bis zur Schneide 8. Die Be- Schichtung 10 mit dem Hartmetall ist ebenfalls in diesem Bereich vorgesehen, so daß hier die radialen Erstreckungen 6 und 7 übereinstimmen.The push-on side of the circular knife 100 is the concave side and is indicated by the arrow 5 in FIG. 2. In the radially outer area there is an annular wear zone 6, the extent of which is indicated in FIG. 1 by the extent of the clip. At least in the wear zone 6, the circular knife 100 has a coating 10 made of hard metal on the push-on side 5, which is indicated by dots in FIGS. 1 and 2 and extends in an annular zone 7 which extends from the cutting edge 8 on the outer circumference of the Circular knife 100 extends further inwards than the wear zone 6. In FIG. 3, a circular knife 100 with a circular cutting edge 8, modified in shape, is indicated, in which otherwise the same reference numbers are used. The difference from the circular knife 100 is that the circular knife 100 'of FIG. 3 has a circumferential shoulder 9 on the concave push-on side, ie the middle part of the knife springs back somewhat. In this case, the width of the annular wear zone 6 corresponds to the distance from the shoulder 9 to the cutting edge 8. The loading Layering 10 with the hard metal is also provided in this area, so that here the radial extensions 6 and 7 coincide.
In Fig. 4 ist der Oberflächenbereich eines Messerkör- pers 1 wiedergegeben, auf dessen Oberfläche 11 die als Ganzes mit 10 bezeichnete Beschichtung mit dem Hartstoff aufgebracht ist. Die Gesamtdicke 12 der Beschichtung 10 hängt vom Einzelfall, d.h. vom Material der die Beschichtung 10 tragenden Fläche und von dem gewählten Verfahren zur Aufbringung der Beschichtung 10 ab und liegt in demFIG. 4 shows the surface area of a knife body 1, on the surface 11 of which the coating with the hard material, designated as a whole by 10, is applied. The total thickness 12 of the coating 10 depends on the individual case, i.e. from the material of the surface supporting the coating 10 and from the chosen method for applying the coating 10 and lies in the
Ausführungsbeispiel in der Größenordnung von 10 μ. In dem Ausführungsbeispiel besteht die Gesamtbeschichtung 10 ferner aus einer ersten Beschichtung 13 aus Wolfram-Car- bid, deren Oberfläche 14 verfahrensbedingt eine gewisse Rauhigkeit aufweist. Um diese Rauhigkeit zu verringern, ist auf die erste Beschichtung 13 eine zweite Beschichtung 15 aufgebracht, die aus TiN besteht und eine glattere Oberfläche 16 bildet.Embodiment in the order of 10 μ. In the exemplary embodiment, the overall coating 10 further comprises a first coating 13 made of tungsten carbide, the surface 14 of which has a certain roughness due to the process. In order to reduce this roughness, a second coating 15, which consists of TiN and forms a smoother surface 16, is applied to the first coating 13.
Der vorgenannte Schichtaufbau ist nur beispielhaft zu verstehen. Es kommen auch andere geeignete Hartstoffbeschichtungen in Betracht, deren Auswahl zum Teil auch von dem Material des Messerkörpers 1 abhängt. Bevorzugt sind jedoch Titan und Stickstoff enthaltende Hartstoffschichten, insbesondere TiN in verschiedenen Zusammensetzungen und Titan-Carbo-Nitrid. The aforementioned layer structure is only to be understood as an example. Other suitable hard material coatings also come into consideration, the selection of which in part also depends on the material of the knife body 1. However, titanium and nitrogen-containing hard material layers are preferred, in particular TiN in various compositions and titanium carbo-nitride.

Claims

P a t e n t a n s p r ü c h e Patent claims
1. Rundmesser (100,100') zum Schneiden von Lebensmitteln wie Fleischwaren, Käse und ähnlichem Schnittgut, mit einem scheibenförmigen Messerkörper (1) aus Stahl , der zur Drehung um eine zur Scheibenebene senkrechte Achse (A) bestimmt ist und am äußeren Rand eine zugeschärfte Schneide (8) aufweist, dadurch gekennzeichnet, daß der Messerkörper (1) eine Beschichtung (10) mit mindestens einem Hartstoff aufweist.1. Circular knife (100, 100 ') for cutting foods such as meat products, cheese and similar clippings, with a disc-shaped knife body (1) made of steel, which is intended for rotation about an axis perpendicular to the disc plane (A) and on the outer edge a sharpened cutting edge (8), characterized in that the knife body (1) has a coating (10) with at least one hard material.
2. Rundmesser nach Anspruch 1, dadurch gekennzeichnet, daß die Beschichtung (10) mindestens in der Verschleißzone (6) einer Flachseite des Messerkörpers (1) vorgesehen ist.2. Circular knife according to claim 1, characterized in that the coating (10) is provided at least in the wear zone (6) of a flat side of the knife body (1).
3. Rundmesser nach Anspruch 2, dadurch gekennzeichnet, daß die Beschichtung (10) in einer ringförmigen Zone (7) am äußeren Rand des Messerkörpers (1) vorgesehen ist.3. Circular knife according to claim 2, characterized in that the coating (10) is provided in an annular zone (7) on the outer edge of the knife body (1).
4. Rundmesser nach Anspruch 3, dadurch gekennzeichnet, daß die radiale Erstreckung der Zone (7) von der Schneide (8) am Umfang radial nach innen mindestens 10 mm beträgt . 4. Circular knife according to claim 3, characterized in that the radial extent of the zone (7) from the cutting edge (8) on the circumference is radially inward at least 10 mm.
5. Rundmesser nach einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, daß die Beschichtung (10) aus einem lebensmittelbeständigen Hartstoff besteht.5. Circular knife according to one of claims 1 to 4, characterized in that the coating (10) consists of a food-resistant hard material.
6. Rundmesser nach einem der Ansprüche 1 bis 5, dadurch gekennzeichnet, daß die Beschichtung (10) Wolfram- Carbid (WC) umfaßt.6. Circular knife according to one of claims 1 to 5, characterized in that the coating (10) comprises tungsten carbide (WC).
7. Rundmesser nach einem der Ansprüche 1 bis 6, da- durch gekennzeichnet, daß auf einer ersten Beschichtung7. Circular knife according to one of claims 1 to 6, characterized in that on a first coating
(13) mindestens eine weitere Beschichtung (15) vorgesehen ist.(13) at least one further coating (15) is provided.
8. Rundmesser nach Anspruch 7, dadurch gekennzeich- net, daß die weitere Beschichtung (15) ein Oberflächenprofil aufweist, welches glatter als das der ersten Beschichtung (13) ist.8. Circular knife according to claim 7, characterized in that the further coating (15) has a surface profile which is smoother than that of the first coating (13).
9. Rundmesser nach Anspruch 7 oder 8, dadurch gekenn- zeichnet, daß die weitere Beschichtung (15) ebenfalls mindestens einen Hartstoff umfaßt.9. Circular knife according to claim 7 or 8, characterized in that the further coating (15) also comprises at least one hard material.
10. Rundmesser nach einem der Ansprüche 7 bis 9, dadurch gekennzeichnet, daß die weitere Beschichtung (15) einen Hartstoff umfaßt, der Titan und Stickstoff enthält, insbesondere Titan-Nitrid (TiN) oder Titan-Carbo-Nitrid (TiCN) . 10. Circular knife according to one of claims 7 to 9, characterized in that the further coating (15) comprises a hard material which contains titanium and nitrogen, in particular titanium nitride (TiN) or titanium carbo-nitride (TiCN).
PCT/DE1998/001615 1997-06-17 1998-06-16 Circular blade WO1998057785A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE29710489U DE29710489U1 (en) 1997-06-17 1997-06-17 Round knife
DE29710489.6 1997-06-17

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WO1998057785A1 true WO1998057785A1 (en) 1998-12-23

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WO (1) WO1998057785A1 (en)

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