EP1075909B1 - Lame de coupe - Google Patents

Lame de coupe Download PDF

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Publication number
EP1075909B1
EP1075909B1 EP00110815A EP00110815A EP1075909B1 EP 1075909 B1 EP1075909 B1 EP 1075909B1 EP 00110815 A EP00110815 A EP 00110815A EP 00110815 A EP00110815 A EP 00110815A EP 1075909 B1 EP1075909 B1 EP 1075909B1
Authority
EP
European Patent Office
Prior art keywords
cutting
cutting knife
layers
blank
knife
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.)
Expired - Lifetime
Application number
EP00110815A
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German (de)
English (en)
Other versions
EP1075909A1 (fr
Inventor
Bert G. Wurst
Stefan Dr. Gahlert
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.)
C&E Fein GmbH and Co
Original Assignee
C&E Fein GmbH and Co
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Publication date
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Publication of EP1075909A1 publication Critical patent/EP1075909A1/fr
Application granted granted Critical
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Classifications

    • 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
    • B26D7/08—Means for treating work or cutting member to facilitate cutting
    • B26D7/086—Means for treating work or cutting member to facilitate cutting by vibrating, e.g. ultrasonically
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B26—HAND CUTTING TOOLS; CUTTING; SEVERING
    • B26B—HAND-HELD CUTTING TOOLS NOT OTHERWISE PROVIDED FOR
    • B26B7/00—Hand knives with reciprocating motor-driven blades
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B26—HAND CUTTING TOOLS; CUTTING; SEVERING
    • B26B—HAND-HELD CUTTING TOOLS NOT OTHERWISE PROVIDED FOR
    • B26B9/00—Blades for hand knives
    • 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

Definitions

  • the invention relates to a cutting knife for severing tough, elastic materials, especially for severing of adhesive beads on vehicle window panes, in wall joints etc., with a fastener that has a mounting bracket for attachment to an oscillation drive, and with a cutting part with at least one cutting edge.
  • the invention further relates to a method for producing a such cutting knife.
  • Such a cutting knife is known from EP-B-0 141 035.
  • Such cutting knives are known to be used in particular for cutting out of windshields used in motor vehicles, provided those due to damage or leaks need to be expanded.
  • Another application is separation of leaky silicone joints made of masonry.
  • the known cutting knives have in common that when cutting of adhesive beads, for example when removing a damaged windshield a significant risk of breakage of a motor vehicle is available for the cutting knife.
  • the cutting knives are due to the very resistant and tough material from which the adhesive bead is made, very quickly dull and have to be reground frequently become.
  • the known knives have so far all been made from a conventional one Knife steel made by first making a flat blank a suitable sheet was punched out, which then if necessary was bent provided the knife had a U-shaped cross-section or should have a bent shape, whereupon then an after-treatment by grinding if necessary joined. The knives were then hardened and then ground and optionally polished.
  • the knives known from EP-B-0 141 035 have a fastening opening in the form of a twelve-sided to form a positive Attachment to the drive shaft of the oscillation drive to enable.
  • the cutting knives are in accordance with the aforementioned DE-A-3 626 762 by a welded connection connected to the drive shaft.
  • knives according to the DE-B-3 838 044 attaches to the drive, as with a Jigsaw. These knives become oscillating in the longitudinal direction driven.
  • knives are also made from a knife steel, hardened and sanded before use.
  • the object of the invention is therefore an improved Cutting knife and a method for producing such specify that enables improved cutting performance and has the lowest possible susceptibility to breakage, so that overall a longer service life is possible.
  • This task is performed with a cutting knife of the type mentioned Art solved in that the cutting knife from a plurality consists of planar interconnected layers, wherein at least two of these layers made of a metallic Material.
  • the object of the invention is completely achieved in this way, because of a multi-layer structure of the cutting knife from a plurality of individual, flatly interconnected Metal layers have better properties overall Knife achieve, namely a particularly high one Hardness and wear resistance on the cutting edge and on the other hand, significantly improved elasticity and achieve reduced susceptibility to breakage.
  • the cutting knives according to the invention are namely for mass parts made by joint renovators, car workshops and are required by glaziers in large numbers, since the relevant cutting knife after a relatively short time are dull or break off. This can often be done with a single Cutting knife only cut out a single windshield become.
  • Damascus blades are only made by hand, the manufacture being extremely complex and is expensive, so for modern knives that come from a variety consist of individual layers that are forged together, three or even four-digit EURO amounts have to be paid.
  • the well-known knives have been used since 1983, so far however not yet considered a knife with several Use metal layers.
  • the metallic ones Layers joined together by hot bonding preferably forged together.
  • the properties of the cutting knife in to be "tailor-made” in a way For example middle layers can be provided, the lower Hardness, however higher toughness and flexural strength exhibit. Outwardly, the layers can gradually become one greater hardness and lower toughness or flexural strength own, and vice versa. It is basically possible to use the different To produce layers from the same material that but is only pretreated differently, for example one has different degrees of deformation (e.g. use of cold-rolled or annealed steel) or these properties only when heat treatment of the interconnected To create layers.
  • special materials which also match the composition of the desired properties are adapted to use, for example a special one in a defined area of the cutting part To achieve high elasticity and flexural strength and in particular on the cutting edge a particularly high hardness and possibly reduced friction in the outermost layers.
  • the outermost metal layers can be a special Undergo surface treatment, such as boronization, carburization, nitrocarburization or the like, a particularly high hardness in the outermost layers in the area of at least one cutting edge.
  • a wear-resistant material preferably made of tungsten carbide, silicon carbide, titanium carbide, Chromium oxide, silicon oxide, titanium oxide, aluminum oxide, boron nitride, Titanium nitride, molybdenum or mixtures thereof or mixtures or alloys with other metals.
  • a wear-resistant So material is a layer that is not made of the same material as the other metallic layers, about a certain steel, but instead that of an inorganic, generally non-metallic Material such as a carbide, an oxide, a nitride.
  • an inorganic, generally non-metallic Material such as a carbide, an oxide, a nitride.
  • a coating of molybdenum is also conceivable.
  • these additional coatings are not like the others metallic layers by hot joining or forging can be applied but by a special coating process, such as vapor deposition or another Processes such as thermal spraying.
  • the invention contains at least an outer layer of the cutting part, friction-reducing additives, preferably inclusions of molybdenum sulfide and / or Graphite.
  • the non-stick effect of PTFE makes the frictional resistance significantly reduced when cutting through an adhesive bead.
  • one Adhesive effect of sealants when severed is counteracted. Due to reduced friction, the temperature at Cutting process lowered. This causes the tendency to occur significantly reduced by vapors. It can advantageously Colored Teflon used to be different To mark designs or make an aesthetic impression improve.
  • this Cutting part on a sickle-shaped curved blade which preferably is concavely curved with respect to the clamping point, wherein the cutting knife further has a U-shaped angled cross section can have, wherein the cutting part with the fastening part is connected via an intermediate part, as is in itself is known in the art.
  • this Cutting knife a mounting bracket for connection to a Rotary oscillation drive on.
  • the cutting knife has a mounting receptacle Connection with an oscillating drive oscillating in the longitudinal direction on.
  • the invention can Use cutting knife advantageously.
  • the cutting knife a core area that consists of an elastic and / or soft material.
  • this Cutting knife on a cutting part which is preferably only in Area of at least one cutting edge with the different Layers is provided.
  • the manufacture of the cutting knife simplified because the core area is made of elastic and / or soft material in a relatively simple way, for example can be made from a sheet by punching, at the same time a mounting receptacle in the form of an opening can be punched out, whereupon then in the area of Cutting part to be applied to the different layers to achieve the properties necessary for the cutting part.
  • the cutting knife also has an intermediate part, can the additional layers of course also over this Part extend, for example, a particularly high toughness and bending strength in the area of the intermediate part achieve.
  • a cutting knife according to the invention can be with significantly improved properties, the one high stability, especially high toughness and flexural strength with good hardness and wear resistance the cutting edge or cutting unites.
  • a forging process i.e. a connection at accordingly high temperature under pressure from hammering or similar.
  • a connection at accordingly high temperature under pressure from hammering or similar it is conceivable to have an intimate Connection also by pressing at a sufficiently high temperature to generate, provided the pressing tools are sufficiently mechanical and are thermally stable. It is also conceivable to have an intimate Connection by friction welding or by a special resistance welding process with additional application of flat To generate pressure.
  • the fastening opening after the heat treatment according to Step (c) generated, preferably by electrical discharge machining or Laser cutting.
  • the manufacturing process becomes like a dodecagon in this way simplified by first creating a flat metallic Blank with a suitable process in a simple manner is generated, which are heat treated in a suitable manner can to achieve the desired mechanical properties, wear resistance and hardness to achieve.
  • a spark erosion process is available for mounting or a laser cutting process with which the attachment holder as an opening in a relatively inexpensive way with sufficient Dimensional accuracy can be generated.
  • the cutting knife should not be flat, but to be provided with a certain bend, so the blank is hot bent before undergoing the heat treatment to improve hardness and / or flexural strength, that means hardening and tempering. In the The use of steel therefore preferably takes place in red-hot condition.
  • this can Cutting knife from a blank from an elastic and / or be made of soft material, at least in the area its at least one cutting edge has a plurality of metallic ones Layers is applied.
  • this can be a Layer of tungsten carbide, silicon carbide, titanium carbide, chromium oxide, Silicon oxide, titanium oxide, aluminum oxide, boron nitride, Titanium nitride, molybdenum or mixtures or alloys with others Trade metals.
  • the wear-resistant layer or the wear-resistant layers are in a preferred development of the invention either by deposition from the gas phase (CVD or PVD) or by thermal spraying, preferably generated by plasma spraying.
  • the wear-resistant layer by thermal spraying made of carbides in a metallic coating, preferably in nickel, cobalt or alloys thereof are included.
  • carbides can also be sprayed thermally
  • the nickel, preferably used for the coating, Cobalt and other alloys usually add carbides have between 8 and 30 percent by weight.
  • carbides have between 8 and 30 percent by weight.
  • the coating in the flame reacts with the carbides the most varied of phases.
  • Tungsten carbide layers, chromium carbide layers or carbide metals conceivable.
  • oxidic layers by thermal Syringes produced their properties can be mixed and alloys can be improved.
  • an alumina layer can be used with 3 percent up to 40 weight percent titanium oxide is interspersed with achieve a relatively high hardness with reduced brittleness leaves.
  • the wear-resistant layer friction-reducing additives added. This can be microscopic, for example small inclusions of molybdenum sulfide and / or graphite act.
  • a cutting knife with high elasticity can also be made in this way and bending strength with good at the same time Establish cutting properties.
  • the manufacture is compared to the manufacture from one Majority of metallic individual layers considerably cheaper, there is an elaborate hot connection, for example by forging many Individual layers are omitted.
  • a hardening process may involve a tempering process to temper to connect with reduced hardness an increased elongation at break and elasticity, as well as an improved To achieve bending strength.
  • the normally inadequate with such a knife Hardness in the area of the at least one cutting edge is now invented by applying a wear-resistant Layer achieved by thermal spraying.
  • a wear-resistant Layer achieved by thermal spraying By applying the thermal spraying can be a layer with sufficient Thickness can be achieved despite being insufficient hard blanks extraordinarily, at least in the area of the cutting edge good cutting properties, in particular high cutting properties Achieve hardness and wear resistance.
  • the wear-resistant layer can be made of molybdenum, for example Carbide, an oxide, a carbide metal, an oxide metal or mixtures thereof.
  • the wear-resistant layer by thermal spraying of carbides, which are in a metallic coating, preferably nickel, cobalt or alloys thereof are.
  • the blank pretreated by roughening before thermal spraying In a preferred further treatment of the invention, the blank pretreated by roughening before thermal spraying.
  • this version is before Spray on the wear-resistant layer an adhesion promoter layer sprayed.
  • the blank is in a preferred development of the invention Procedure together with the mounting fixture Stamping made.
  • the wear-resistant layer can reduce friction
  • Additives preferably inclusions made of molybdenum sulfide and / or graphite can be added.
  • FIG. 1 shows a cutting knife according to the invention as a whole number 10.
  • the cutting knife 10 is put together used with an oscillation drive 12 with rotary oscillation, which is only indicated schematically in Fig. 1, and its Drive shaft 14 with a high frequency in the range between about 5,000 and 28,000 vibrations per minute with a small swivel angle in the range between about 0.5 and 7 degrees around Longitudinal axis 18 of the drive shaft can be driven to oscillate.
  • 1 has a U-shaped angle Cross section and has a fastening part 20 and one sickle-shaped curved cutting part 22, which with the fastening part 20 is connected via an intermediate web 24.
  • a mounting receptacle 26 provided in the form of an opening, which as a regular Polygon, in the case shown as a star-shaped twelve-sided and that is a positive fixation on the drive shaft 14 allowed.
  • a screw 16 for securing on the drive shaft 14 also serves a screw 16, which is in a not shown Threaded blind hole of the drive shaft 14 is screwed.
  • a flat blank 32 is shown, from which the Cutting knife 10 according to FIGS. 1 and 2 by bending and others subsequent processing steps can be produced.
  • the cutting knife 10 shown here is U-shaped has angled cross-section, are also any other Knife shapes conceivable.
  • a flat cutting knife could also be used approximately in the shape of the blank 32, the final shape of the Represent cutting knife.
  • the cutting knife could e.g. also have a bent shape or a flat shape and if necessary with a stop roller to limit the Depth of cut, as per itself e.g. from the DE-A-3 304 981 and from EP-B-0 174 427.
  • FIGS. 6, 8, 9 and 10 Various such variants are shown in FIGS. 6, 8, 9 and 10 exemplified.
  • the cutting knife 10b shown in FIGS. 6 and 8 is just formed and has a fastening part 20b with a round mounting receptacle 26b and a cutting part 22b two straight cutting edges 28b and 30b, starting from the fastening part 20b to a common tip that is rounded is, converge towards it, so that there is an approx wedge-shaped cutting part 22b results.
  • a cranked cutting knife 10c is shown in Fig. 9, while in Fig. 10b one curved cutting knife 10d is shown.
  • the cutting knife 10 according to the invention is now characterized a special type of manufacture, which is explained below becomes.
  • the cutting knife 10 made from a variety of thin metal layers, which are connected by a forging process.
  • the individual layers can be made from thinly rolled sheets are punched out before they are forged together get connected.
  • the sheets are preferably made of steel, in particular from a knife steel of a suitable composition, different steels for the different layers can be used with different compositions, to "tailor-made" properties for the cutting knife 10 produce.
  • the cutting knife 10 can e.g. on Have cutting part 22 which is ground crowned on both sides and is provided with a blade 28 and 30 on each side. It can consist of a central layer 34, a subsequent one Layer 36 and an outer metallic layer 38, and on the outside it is also completely thermal sprayed wear-resistant layer 40 may be surrounded.
  • the individual metallic layers 34, 36, 38 of the blank after its production by punching connected by forging.
  • the attachment opening 26 preferably only after the forging process, however before the application of the thermally sprayed layer 40 generated.
  • the mounting bracket 26 preferably by a spark erosion method or generated by laser cutting, which is a relatively inexpensive Manufacturing and still high dimensional accuracy allowed.
  • the blank 32 thus produced is bent in the red-hot state, to create the U-shaped angled shape of the cutting knife.
  • the Cutting knife 10 to have high elasticity and bending strength the core layer 34 to generate the outward decreases through layer 36 into layer 38, but at the same time the wear resistance and hardness increases.
  • This layer 40 is preferably an oxide layer or carbide layer, optionally with metal additives or a layer of molybdenum, which is also high Has hardness and wear resistance.
  • thermal Spraying to achieve the outer layer 40 is that this layer 40 with a sufficient thickness of the order of magnitude from a few tenths to about a millimeter or even more can be applied in a relatively inexpensive way can, whereby this thermally sprayed layer 40 a sufficient Has strength to even with multiple resharpening during the use of the cutting knife 10 the cheap To maintain cutting properties.
  • the thermally sprayed Layer 40 may be made of tungsten carbide, for example be in a nickel, cobalt or whose alloys are embedded, the amount of metal between can be about 8 and 30 weight percent. It can for example, the carbide metal 85 WC 15 Co-Cr, the high hardness with relatively high breaking strength distinguished.
  • the coating can also be selected that the coefficient of thermal expansion is as close as possible to the coefficient of expansion of the metallic blank. This will result in better adhesion even under thermal stress reached and chipping avoided.
  • FIG. 5 An alternative cross-sectional shape of the cutting part is in Fig. 5 shown and designated overall by the number 22a.
  • the cutting part 22a consists of several layers one Knife steel, but essentially has a cross section rectangular shape and is only on the side its cutting edge 28a facing the fastening opening 26 is bevelled on one side, while on the mounting hole 26 facing away from both sides Cutting edge 30a is provided, but not so is sharpened, as is the case with the cutting edge according to FIG. 4 the case is.
  • This cutting edge 30a only serves as an "emergency cutting edge” Return the cutting knife in an already cut one Part of the adhesive bead should allow.
  • the outer layers 36 and 38 forged on both sides around the core layer 34 are, so that a spherical cross-sectional shape already during the forging process arises, the layers 34a, 36a, 38a or 42, 44 in a largely flat manner according to FIG. 5 by forging connected.
  • the middle layer 34a is specifically for a high Elasticity and flexural strength is designed and the layers 36a and 42 adjoining on both sides a little have less elasticity, but greater Hardness and wear resistance, especially the layer 38a on one side, towards which the cutting edge 28a is wedge-shaped is bevelled on one side, for a particularly high Hardness and wear resistance designed.
  • a thermally sprayed one Layer 40a be applied. That of the thermally sprayed Layer 40a opposite outer layer 44 the other side of the cutting part 22a is not special for one high hardness, but more for good elasticity and Flexural strength, because there are none on this side Cutting edge is provided.
  • the second cutting edge 30a occurs the side facing away from the mounting opening 26 Cutting part 22a does not have particularly good cutting properties as this only serves as an auxiliary cutting edge.
  • the blank 32 from a knife steel of suitable thickness in one single operation can be made by punching, whereby at the same time the fastening opening 26 is punched out.
  • the properties of the knife steel are special designed for high elasticity and flexural strength, which also in the subsequent heat treatment - if necessary after a previous bending process - taken into account becomes. Therefore, the knife steel is not, as usual, only hardened, but preferably hardened first and then over a sufficiently long period of time with a sufficiently high one Tempered to get such compensation, that there is good flexural strength.
  • this wear-resistant layer 40a on the to achieve metallic base body this is before the thermal Syringes are first machined, e.g. boned, ground and polished if necessary, whereupon then roughening (fine sandblasting with corundum or the like). Thereupon there is first an adhesion promoter layer applied, on which then the wear-resistant Layer 40a is sprayed on, if necessary can be done in multiple layers to produce the desired thickness.
  • the wear-resistant layer 40a can in turn, how previously mentioned, such as an oxide or carbide layer act or a molybdenum layer.
  • the wear-resistant layer 40 or 40a still friction-reducing additives as microscopic Inclusions are integrated, for example from molybdenum sulfide or graphite, where the thermal Spraying process to prevent oxidation under protective gas he follows.
  • the cutting knife 10b shown in FIGS. 6 and 8 differs different from the previously described versions in another aspect.
  • the cutting knife 10b is namely from a blank from one elastic and / or soft material made on the only a plurality of metallic ones in the area of the cutting part Layers is applied to the desired cutting area improved properties, namely on the one hand high Toughness and flexural strength and, on the other hand, high Hardness on the outer layers in the area of the cutting edges 28b and To achieve 30b.
  • FIG. 7 is a section along the line VII-VII of FIG. 6 in an enlarged view shows.
  • the cutting knife 10b has a core area 42 which consists of a relatively soft, but elastic and tough steel is, with the core area essentially over the Fastening part 20b extends while in the area of the cutting part 22b different metallic layers 34b on both sides, 36b and 38b one after the other to one starting from the core region 42 thin web 44 are applied.
  • the web 44 out the material of the core area 42 they can be made thereon applied layers 34b, 36b and 38b made of other materials, preferably steels consist of a high overall Achieve strength and elasticity, as well as high hardness in the area of the outermost layer 38b on the cutting edges 28b and 30b.
  • a knife constructed in this way is considerably easier and less expensive produce because the elaborate production about by forging the metallic layers 34b, 36b and 38b only is limited to the cutting part 22b during the manufacturing used blank cheaper e.g. by punching including the mounting receptacle designed as a circular opening 26b can be manufactured.
  • FIG. 11 Another modification of a cutting knife according to the invention is shown in Fig. 11 and generally designated by the number 10c.
  • the cutting knife 10c according to FIG. 11 is opposite to that previously described versions not for connection to a Rotary oscillation drive suitable, but for connection with a longitudinal oscillation drive, as indicated by arrow 48 is.
  • a receptacle 26c is provided which has recesses 46 on both sides with which the cutting knife like in a jigsaw the longitudinal oscillation drive is clamped.
  • the cutting part 22c is formed, which again has a core area 42c, on both sides, as previously explained with reference to FIG. 7, metallic Layers are applied to create cutting edges 28c and 30c.
  • Such a cutting knife can, for example, as in DE-A-3 838 044 can be used.
  • FIGS. 9 and 10 Further designs of a cutting knife according to the invention are shown in FIGS. 9 and 10 and overall with the Numbers 10d and 10e designated.
  • 9 shows a cutting knife
  • FIG. 10d shows an offset in FIG. 10 is a Cutting knife 10e shown in a curved version.

Claims (32)

  1. Lame pour couper des matériaux élastiques tenaces, en particulier pour couper des cordons de colle par exemple sur des vitres de véhicules ou des joints de murs, avec une partie de fixation (20) qui présente un logement de fixation (26 ; 26b) pour la fixation sur un entraínement oscillatoire (12), et avec une partie tranchante (22 ; 22a ; 22b ; 22c) avec au moins un tranchant (28, 30 ; 28a, 30a ; 28b, 30b ; 28c, 30c), caractérisée en ce que la lame (10) présente une pluralité de couches (34, 36, 38, 40 ; 34a, 36a, 38a, 40a, 42, 44 ; 34b, 36b, 38b) reliées à plat les unes aux autres, au moins deux de ces couches (34, 36, 38 ; 34a, 36a, 38a, 42, 44 ; 34b, 36b, 38b) étant composées d'un matériau métallique.
  2. Lame selon la revendication 1, caractérisée en ce que les couches métalliques (34, 36, 38 ; 34a, 36a, 38a, 42, 44 ; 34b, 36b, 38b) sont reliées entre elles par assemblage à chaud, de préférence par forgeage.
  3. Lame selon la revendication 1 ou 2, caractérisée en ce que certaines des couches (34, 36, 38 ; 34a, 36a, 38a, 42, 44 ; 34b, 36b, 38b) sont fabriquées dans des matériaux présentant des caractéristiques différentes.
  4. Lame selon la revendication 3, caractérisée en ce qu'au moins une couche extérieure (38, 40 ; 38a, 40a ; 38b) est prévue, qui présente de bonnes propriétés de coupe, en particulier une grande dureté, et en ce qu'au moins une couche intérieure (34, 36 ; 34a, 36a ; 34b, 36b) est prévue, qui présente une bonne élasticité et une grande résistance à la rupture en flexion.
  5. Lame selon la revendication 3, caractérisée en ce qu'au moins une couche extérieure (38, 40 ; 38a, 40a ; 38b) est prévue, qui est fabriquée dans un matériau plus mou que les autres couches et/ou possède une plus grande élasticité que les autres couches.
  6. Lame selon l'une des revendications précédentes, caractérisée en ce qu'au moins l'une (40 ; 40a) des couches (34, 36, 38, 40 ; 34a, 36a, 38a, 40a, 42, 44 ; 34b, 36b, 38b) est composée d'un matériau résistant à l'usure, de préférence du carbure de tungstène, du carbure de silicium, du carbure de titane, de l'oxyde de chrome, de l'oxyde de silicium, de l'oxyde de titane, de l'oxyde d'aluminium, du nitrure de bore, du nitrure de titane, du molybdène ou des mélanges de ceux-ci.
  7. Lame selon l'une des revendications précédentes, caractérisée en ce qu'au moins une couche extérieure (40 ; 40a) de la partie tranchante (22 ; 22a) contient des additifs réduisant le frottement, de préférence des inclusions de sulfure de molybdène et/ou de graphite.
  8. Lame selon l'une des revendications 1 à 6, caractérisée en ce qu'au une couche extérieure (40 ; 40a) de la partie tranchante (22 ; 22a) est composée de PTFE.
  9. Lame selon l'une des revendications précédentes, caractérisée en ce que la partie tranchante (22 ; 22a) est courbée en forme de faucille.
  10. Lame selon l'une des revendications précédentes, caractérisée en ce que la lame (10 ; 10a) présente une section coudée en U, la partie tranchante (22 ; 22a) étant reliée à la partie de fixation (20) au moyen d'une partie intermédiaire (24).
  11. Lame selon l'une des revendications précédentes, caractérisée en ce que la lame (10 ; 10a ; 10b) présente un logement de fixation (26 ; 26b) pour l'assemblage avec un entraínement oscillatoire rotatif (14).
  12. Lame selon l'une des revendications précédentes, caractérisée en ce que la lame (10c) présente un logement de fixation (26c) pour l'assemblage avec un entraínement oscillatoire oscillant dans la direction longitudinale.
  13. Lame selon l'une des revendications précédentes, caractérisée en ce que la lame (10b ; 10c) présente une zone centrale (42 ; 42c) qui est composée d'un matériau élastique et/ou mou.
  14. Lame selon la revendication 13, caractérisée en ce que la lame (10b ; 10c) présente une partie tranchante (22b ; 22c) qui est muni de différentes couches au niveau du tranchant (28b, 30b ; 28c, 30c) au nombre d'au moins un.
  15. Procédé de fabrication d'une lame (10) pour couper des matériaux élastiques tenaces, en particulier pour couper des cordons de colle par exemple sur des vitres de véhicules, avec une partie de fixation (20 ; 20b ; 20c) qui présente un logement de fixation (26 ; 26b ; 26c) pour la fixation sur un entraínement oscillatoire (12), et avec une partie tranchante (22 ; 22a ; 22b ; 22c) avec au moins un tranchant (28, 30 ; 28a, 30a ; 28b, 30b ; 28c, 30c), comprenant les étapes consistant à :
    (a) fabriquer une pluralité de couches métalliques minces (34, 36, 38 ; 34a, 36a, 38a, 42, 44 ; 34b, 36b, 38b),
    (b) assembler à chaud les couches métalliques (34, 36, 38 ; 34a, 36a, 38a, 42, 44 ; 34b, 36b, 38b), de préférence par forgeage, afin de produire une ébauche métallique (32) pour la lame (10),
    (c) traiter thermiquement l'ébauche (32), de préférence par durcissement ou affinage de l'ébauche (32),
    (d) usiner l'ébauche (32) par ponçage et/ou polissage.
  16. Procédé selon la revendication 15, dans lequel le logement de fixation (26) est produit après le traitement thermique de l'étape (c), de préférence par électroérosion ou découpage laser.
  17. Procédé selon la revendication 15, dans lequel la lame (10b ; 10c) est fabriquée à partir d'une ébauche composée d'un matériau élastique et/ou mou, sur lequel une pluralité de couches métalliques est appliquée au moins sur la zone de son tranchant (28b, 30b ; 28c, 30c) au nombre d'au moins un.
  18. Procédé selon la revendication 17, dans lequel l'ébauche est fabriquée par estampage à partir du matériau élastique et/ou mou, en même temps que le logement de fixation (26b).
  19. Procédé selon la revendication 15 ou 16, dans lequel l'ébauche (32) est cintrée à chaud pour produire une section coudée ou pliée de préférence en U.
  20. Procédé selon l'une des revendications 15 à 19, dans lequel au moins une couche supplémentaire résistant à l'usure (40 ; 40a) est appliquée sur la partie tranchante.
  21. Procédé selon la revendication 20, dans lequel la couche résistant à l'usure (40 ; 40a) est fabriquée en carbure de tungstène, carbure de silicium, carbure de titane, oxyde de chrome, oxyde de silicium, oxyde de titane, oxyde d'aluminium, nitrure de bore, nitrure de titane, molybdène ou des mélanges de ceux-ci.
  22. Procédé selon la revendication 20 ou 21, dans lequel la couche résistant à l'usure (40 ; 40a) au nombre d'au moins une est appliquée par pulvérisation thermique, de préférence par pulvérisation plasma ou par CVD ou PVD.
  23. Procédé selon la revendication 20 ou 21, dans lequel la couche résistant à l'usure (40 ; 40a) est fabriquée par pulvérisation thermique de carbures, qui sont placés dans une enveloppe métallique, de préférence en nickel, cobalt ou des alliages de ceux-ci.
  24. Procédé selon l'une des revendications 20 à 23, dans lequel on ajoute à la couche résistante à l'usure (40 ; 40a) des additifs réduisant le frottement, de préférence des inclusions de sulfure de molybdène et/ou de graphite.
  25. Procédé de fabrication d'une lame (10) pour couper des matériaux élastiques tenaces, en particulier pour couper des cordons de colle par exemple sur des vitres de véhicules, avec une partie de fixation (20 ; 20a) qui présente un logement de fixation (26 ; 26b) pour la fixation sur un entraínement oscillatoire (12), et avec une partie tranchante (22 ; 22a) avec au moins un tranchant (28, 30 ; 28a, 30a), comprenant les étapes consistant à ;
    (a) fabriquer une ébauche (32) à partir d'un acier,
    (b) traiter thermiquement l'ébauche (32), de préférence par affinage de l'ébauche (32),
    (c) usiner l'ébauche (32), de préférence par ponçage et/ou polissage,
    (d) application d'au moins une couche résistante à l'usure (40 ; 40a) sur la partie tranchante (22, 22a) par pulvérisation thermique.
  26. Procédé selon la revendication 25, dans lequel la couche résistant à l'usure (40 ; 40a) est fabriquée en molybdène, en carbure, en oxyde, en carbure-métal, en oxyde-métal ou des mélanges de ceux-ci.
  27. Procédé selon la revendication 26, dans lequel la couche résistant à l'usure (40 ; 40a) est fabriquée par pulvérisation thermique de carbures, qui sont placés dans une enveloppe métallique, de préférence en nickel, cobalt ou des alliages de ceux-ci.
  28. Procédé selon la revendication 25, 26 ou 27, dans lequel l'ébauche (32) est traitée par grenaillage avant la pulvérisation thermique.
  29. Procédé selon l'une des revendications 25 à 28, dans lequel une couche de primaire d'adhérence est pulvérisée avant la pulvérisation de la couche résistant à l'usure (40 ; 40a).
  30. Procédé selon l'une des revendications 25 à 29, dans lequel l'ébauche (32) est fabriquée par estampage avec le logement de fixation (26).
  31. Procédé selon l'une des revendications 25 à 30, dans lequel l'ébauche (26) est cintrée avant le traitement thermique de l'étape (b) pour produire une section coudée ou pliée de préférence en U.
  32. Procédé selon l'une des revendications 25 à 31, dans lequel on ajoute à la couche résistante à l'usure (40 ; 40a) des additifs réduisant le frottement, de préférence des inclusions de sulfure de molybdène et/ou de graphite.
EP00110815A 1999-08-12 2000-05-22 Lame de coupe Expired - Lifetime EP1075909B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19938115A DE19938115A1 (de) 1999-08-12 1999-08-12 Schneidmesser
DE19938115 1999-08-12

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EP1075909A1 EP1075909A1 (fr) 2001-02-14
EP1075909B1 true EP1075909B1 (fr) 2002-11-20

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EP00110815A Expired - Lifetime EP1075909B1 (fr) 1999-08-12 2000-05-22 Lame de coupe

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US (1) US6422110B1 (fr)
EP (1) EP1075909B1 (fr)
JP (1) JP2001120858A (fr)
AT (1) ATE228045T1 (fr)
DE (2) DE19938115A1 (fr)
ES (1) ES2187410T3 (fr)

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JP3731153B2 (ja) * 2001-03-29 2006-01-05 兼房株式会社 耐摩耗部品の接合層保護構造
MXPA04004490A (es) * 2001-11-13 2005-05-16 Acme United Corp Recubrimiento para implementos cortantes de papeleria.
US7913402B2 (en) * 2001-11-13 2011-03-29 Acme United Corporation Coating for cutting implements
US20060137971A1 (en) * 2002-07-01 2006-06-29 Larry Buchtmann Method for coating cutting implements
US7934319B2 (en) * 2002-10-28 2011-05-03 Acme United Corporation Pencil-sharpening device
WO2007056719A2 (fr) * 2005-11-08 2007-05-18 Acme United Corporation Ciseaux a assistance mecanique
EP1953004B1 (fr) * 2007-01-24 2012-03-07 KUM Limited Lame pour un taille-crayon
EP1985726A1 (fr) * 2007-04-27 2008-10-29 WMF Aktiengesellschaft Outil de coupe doté d'une arête coupante renforcée en céramique
JP5108630B2 (ja) * 2008-05-27 2012-12-26 兼房株式会社 平板状刃物
WO2010074672A1 (fr) * 2008-12-23 2010-07-01 Otis Elevator Company Resurfaçage d'une poulie à gorge dans une gaine d'élévation
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Also Published As

Publication number Publication date
ES2187410T3 (es) 2003-06-16
DE50000781D1 (de) 2003-01-02
JP2001120858A (ja) 2001-05-08
EP1075909A1 (fr) 2001-02-14
ATE228045T1 (de) 2002-12-15
DE19938115A1 (de) 2001-02-22
US6422110B1 (en) 2002-07-23

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