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WO1999006613A1 - Outils destines a l'usinage de pieces et procede de production de ces outils - Google Patents

Outils destines a l'usinage de pieces et procede de production de ces outils Download PDF

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Publication number
WO1999006613A1
WO1999006613A1 PCT/EP1998/004666 EP9804666W WO9906613A1 WO 1999006613 A1 WO1999006613 A1 WO 1999006613A1 EP 9804666 W EP9804666 W EP 9804666W WO 9906613 A1 WO9906613 A1 WO 9906613A1
Authority
WO
WIPO (PCT)
Prior art keywords
base body
layer
alloy
cutting
tool
Prior art date
Application number
PCT/EP1998/004666
Other languages
German (de)
English (en)
Inventor
Hans-Jürgen Gittel
Original Assignee
Ledermann Gmbh
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 Ledermann Gmbh filed Critical Ledermann Gmbh
Publication of WO1999006613A1 publication Critical patent/WO1999006613A1/fr

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23C—MILLING
    • B23C5/00—Milling-cutters
    • B23C5/02—Milling-cutters characterised by the shape of the cutter
    • B23C5/08—Disc-type cutters
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23D—PLANING; SLOTTING; SHEARING; BROACHING; SAWING; FILING; SCRAPING; LIKE OPERATIONS FOR WORKING METAL BY REMOVING MATERIAL, NOT OTHERWISE PROVIDED FOR
    • B23D61/00—Tools for sawing machines or sawing devices; Clamping devices for these tools
    • B23D61/02—Circular saw blades
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23D—PLANING; SLOTTING; SHEARING; BROACHING; SAWING; FILING; SCRAPING; LIKE OPERATIONS FOR WORKING METAL BY REMOVING MATERIAL, NOT OTHERWISE PROVIDED FOR
    • B23D61/00—Tools for sawing machines or sawing devices; Clamping devices for these tools
    • B23D61/02—Circular saw blades
    • B23D61/04—Circular saw blades with inserted saw teeth, i.e. the teeth being individually inserted
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23C—MILLING
    • B23C2210/00—Details of milling cutters
    • B23C2210/50—Cutting inserts
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23C—MILLING
    • B23C2222/00—Materials of tools or workpieces composed of metals, alloys or metal matrices
    • B23C2222/28—Details of hard metal, i.e. cemented carbide
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23C—MILLING
    • B23C2228/00—Properties of materials of tools or workpieces, materials of tools or workpieces applied in a specific manner
    • B23C2228/49—Sintered
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23C—MILLING
    • B23C2240/00—Details of connections of tools or workpieces
    • B23C2240/08—Brazed connections

Definitions

  • the invention relates to a tool for machining workpieces made of wood, a wood-based material, a plastic or the like.
  • a circular saw blade for woodworking which consists of a circular main body with teeth arranged on its circumference. Intermediate pieces are welded to the teeth, which in turn carry the cutting elements.
  • Such a structure requires that the cutting elements are first connected to the intermediate pieces by means of a suitable soldering method and then the intermediate pieces in specially for this purpose created recesses of the base body are used and welded to it.
  • the cutting elements generally have a layer of a hard metal or polycrystalline synthetic diamond on their cutting surfaces, so that measures must be taken to avoid excessive heat development of the cutting element as a result of the connection process with the intermediate piece or the base body.
  • the present invention has for its object to provide a tool of the type specified in the preamble of claim 1, which is simple in construction, and to provide a method for producing such a tool by which cost-effective production is achieved.
  • the main advantages of the invention are the fact that the tool is practically in one piece, which means that no additional parts have to be added.
  • the base body itself already has the complete shape, the hard material only being coated on the cutting edges. In this way, a quasi-hard metal tooth can be generated directly on the base body.
  • the layer thickness of at least 1 mm has the advantages that corner angles and / or axis angles can be ground or that a hollow tooth can be produced by grinding the tooth face.
  • the minimum thickness of the layer of 1 mm makes it possible to provide a clearance angle or protrusion so that the base body does not run against the clippings. Due to the clearance angle on the teeth or cutting edges, perfect cutting is achieved in particular with a circular saw blade. The layer thickness also permits repeated sharpening of blunted cutting edges, so that the useful life, in particular of circular saw blades, is significantly increased.
  • An extremely high dimensional accuracy can be achieved by the invention and the manufacturing process is considerably simplified since no soldering or welding processes are required to connect the individual cutting elements to the base body. Since an offset of the cutting elements with respect to the base body is thus also avoided and the coating of the metal alloy on the cutting surfaces of the base body is possible within narrow tolerances, the removal volume during sharpening is reduced to a minimum.
  • a hard metal-like alloy with high strength is formed in the contact area of the layer on the base body, so that detachment of the alloy from the base body is avoided. Since the hard metal-like alloy is applied as a powder, an extremely large given, practically any shape and layer thickness can be realized.
  • FIG. 2 is a view of a tooth in the direction of arrow X in Fig. 1,
  • FIG. 2 shows an embodiment variant of FIG. 2
  • FIG. 4 shows a variant of FIG. 1,
  • FIG. 6 is a view in the direction of arrow VI in Fig. 5,
  • FIG. 7 is a view in the direction of arrows VII in Fig. 6,
  • FIGS. 5 and 8 shows a variant of FIGS. 5 and
  • Fig. 10 shows a detail of the section through a tooth in a substantially enlarged view.
  • Fig. 1 shows a section of a circular saw blade 1, which consists of a base body 2 with teeth 3 formed on the circumference.
  • Each of the teeth 3 has a cutting surface 4 at its front end, as seen in the direction of rotation, which is provided with a layer 5 of a hard material alloy.
  • a hard material alloy This is preferably a hard metal-like alloy with a hard material content greater than 50%.
  • Hard material contents of at least 60% are considered to be particularly advantageous, as a result of which particularly good wear resistance is achieved.
  • This percentage refers to the volume, which corresponds to a hard material content of approx. 80%, based on the mass.
  • a hard material content of 70% (volume percent) or more can be favorable.
  • a chip space 6 is formed between each two adjacent teeth 3, the cutting edge 7 being formed on the side of the layer 5 facing the chip space 6.
  • the hard metal-like alloy is provided in powder form and is applied to the cutting surfaces 4, for example by means of laser powder deposition welding or plasma powder deposition welding.
  • the powder is blown at a relatively low speed against the surface of the tooth 3 to be coated on the base body 2, and the alloy material is partially melted by the heat energy supplied at the same time and firmly connected to the cutting surface 4 of the base body 2.
  • the powder can be, for example, an iron-based alloy or cobalt with vanadium carbide or tungsten carbide as the hardness carrier.
  • An alloy material with a carbide grain size of at most 3 ⁇ m is particularly preferred.
  • 2 shows a view of a tooth 3 'of the circular saw blade 1 in the direction of the arrow X in FIG. 1.
  • On the tooth 3' there is a cutting surface 4 'on the left-hand side - this is the front edge in the direction of rotation. which is provided with a layer 5 'of a hard metal-like alloy.
  • This layer 5 ' is applied, for example, in a thickness of 3 mm and forms a cutting edge 7' on the side facing a chip space 6 *.
  • This cutting edge 7 ' runs approximately in the axial direction of the circular saw blade 1 and thus orthogonal to the plane of the circular saw blade.
  • the thickness of the alloy layer can be made differently, as is evident, for example, from FIG. 3.
  • a layer 5 "of the alloy is provided on a cutting surface 4", which is considerably thinner than that in FIG. 2.
  • the representation of the circular saw blade 1 of FIG. 3 is correct with regard to the chip space 6 "and the tooth 3" with the previously described figure.
  • the layer thickness of the hard metal-like alloy 5 "should be at least 1.0 mm, but layer thicknesses of up to, for example, 4 mm can also be provided. A larger layer thickness has the advantage that repeated regrinding is possible to sharpen the cutting edges.
  • FIG. 4 shows a section of a circular saw blade 10 which has a base body 12 with teeth 13 formed on its peripheral edge and located at regular intervals.
  • a chip space 16 is located between each two adjacent teeth 13, with a cutting surface 14 on the side of each tooth 13 facing the chip space 16 is provided.
  • the ring surface 8 as well as the teeth 13 and in particular their cutting surfaces 14 are coated with the hard metal-like alloy, the layer applied to the cutting surface 14 being provided with the reference symbol 15.
  • the surface delimiting the chip space 16 can also be coated.
  • the hard metal-like alloy can be applied in the form of a powder by means of the flame spraying method, the area of the base body 12 located radially inside the circular line 9 being covered.
  • the powder is applied to the uncovered surfaces of the base body 12, the material, that is to say the powder, being partially melted by the supply of thermal energy, so that a very intensive connection with the surface of the base body in the area of the ring surface 8 and the teeth 13 or the cutting surface 14.
  • FIG. 5 shows an enlarged representation of the radial top view of a tooth 3 of the base body 2.
  • the tooth 3 is provided on its front cutting surface 4 with the layer 5 of the hard material alloy, this layer 5 not being located exclusively along the cutting surface 4 of the tooth 3 extends, but also layer sections 11 are applied to the side surfaces 4 * of the tooth 3 adjacent to the cutting surface 4.
  • the layer 5 has the greatest extent in the axial direction on the cutting edge 7, which extends orthogonally to the plane of the base body 2.
  • layer 5 is applied with a layer thickness d ⁇ and projects axially beyond base body 2, layer 5 of the hard material alloy being reworked to produce a sharp cutting edge 7, that is to say ground.
  • the lateral edges 7 'and 7 are ground at an angle ⁇ ⁇ or * 2 in order to obtain a clearance angle.
  • FIG. 6 shows a view in the direction of arrow VI of FIG. 5, from which the contour of the tooth 3 with its cutting surface 4 delimiting the chip space 6 can be seen. Since the tooth 3 is covered in this area by the layer 5 of the metal alloy, the cutting surface 4 is only shown as a dashed line. As is also clear from FIG. 6, the hard alloy is also applied to the radially outer surface of the tooth 3, the outer surface there forming a clearance angle or corner angle ⁇ to the tangent of the flight circle of the saw blade. Instead of the corner angle, a hollow tooth can also be created by grinding the tooth face.
  • Fig. 7 shows a view in the direction of arrows VII in Fig. 6. From this view it is clear that the lateral edges 7 'and 7 "of the layer 5 run obliquely to the plane of the base body 2, the greatest width of the layer 5 the radially outer cutting edge 7 is given, so that the alloy layer faces the chip space 6 tapered towards.
  • the layer 5 can also run obliquely in accordance with a predetermined bevel angle of the tooth 3 by uniformly applying the powder of the alloy, so that the cutting edge 7 has a bevel angle ⁇ .
  • a bevel angle can also be generated independently of the outer edge of the tooth 3, for example by grinding, for which purpose a corresponding material removal of the alloy layer is required.
  • FIG. 8 shows an embodiment variant of FIG. 5, in which the layer 5 of the alloy material is not coated on the contour of the tooth 3 with the alloy material, but only on the cutting surface of the tooth 3.
  • This layer 5 of a hard metal-like alloy is applied in a thickness d2 which is greater than in the previously described figures, for example it can be approximately 4 mm between the cutting edge 7 and the cutting surface 4 of the tooth 3.
  • the layer 5 has the greatest axial width at the cutting edge 7 and protrudes from both sides of the base body 2.
  • an axis angle ⁇ ⁇ can be generated by grinding.
  • FIG. 9 shows a section of a radial view of a milling cutter 20 which has a chip space 26 on its base body 22.
  • a cutting edge 21 extends, on the cutting surface 24 of which a layer 25 is arranged which, like in the exemplary embodiments already described, consists of a hard material alloy applied in the form of a powder.
  • the cutting edge 27 of the layer 25 also extends at an axis angle & 2 to the axis of the base body 22
  • Layer section 25 ' may be provided, but an embodiment analogous to FIG. 8 is also possible.
  • FIG. 10 shows an enlarged view of a section of a section through the tooth 3 with the layer 5 forming the cutting element, which consists of several layers 17, 18, 19.
  • the layers 19, 18 and 17 are applied in succession, the welding being carried out simultaneously with the application of the material.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Other Surface Treatments For Metallic Materials (AREA)

Abstract

Un outil destiné à l'usinage de pièces en bois ou en matériau équivalent est composé généralement d'un corps de base (2) doté d'éléments de coupe. Ces éléments de coupe, actuellement fabriqués séparément, sont constitués d'un support de lame et de la lame réalisée dans un matériau résistant à l'usure. Les éléments de coupe sont fixés individuellement au corps de base (2) ou assemblés en groupes sur des adaptateurs qui ensuite sont alignés sur le corps de base et fixés à ce dernier. Pour simplifier la fabrication et en réduire le coût, l'invention décrit un outil dont les éléments de coupe sont formés à même le corps de base (2) et sont dotés d'une couche (5) d'un alliage de matériau à résistance mécanique élevée. Cette couche, appliquée sur les surfaces de coupe (4) du corps de base (2) sous forme de poudre, peut être appliquée en plusieurs strates.
PCT/EP1998/004666 1997-08-01 1998-07-25 Outils destines a l'usinage de pieces et procede de production de ces outils WO1999006613A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE1997133483 DE19733483A1 (de) 1997-08-01 1997-08-01 Werkzeug zur Bearbeitung von Werkstücken und Verfahren zur Herstellung dieses Werkezugs
DE19733483.0 1997-08-01

Publications (1)

Publication Number Publication Date
WO1999006613A1 true WO1999006613A1 (fr) 1999-02-11

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PCT/EP1998/004666 WO1999006613A1 (fr) 1997-08-01 1998-07-25 Outils destines a l'usinage de pieces et procede de production de ces outils

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DE (1) DE19733483A1 (fr)
WO (1) WO1999006613A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103817412A (zh) * 2014-02-28 2014-05-28 中信重工机械股份有限公司 一种硬岩掘进机的刀盘与刀座的焊接工艺
US20140377021A1 (en) * 2013-06-21 2014-12-25 Albert Knebel Gmbh & Co. Kg Holding Saw blade having a small saw tooth

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10121869A1 (de) * 2001-05-05 2002-11-21 Winter & Sohn Ernst Verfahren zum Bearbeiten von mehrschneidigen Werkzeugen, bei denen die Schneiden auf einem Flugkreis liegen
DE102006062779A1 (de) * 2006-05-04 2008-05-21 Leitz Gmbh & Co. Kg Kreissägeblatt mit Räumschneiden
CN111607756A (zh) * 2020-05-28 2020-09-01 广东金辉刀剪股份有限公司 一种刀具刃口等离子溶覆工艺

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0290051A2 (fr) * 1987-05-08 1988-11-09 Castolin S.A. Procédé de fabrication d'une lame autoaiguisante
WO1996036465A1 (fr) * 1995-05-15 1996-11-21 Sandvik Aktiebolag Abrasifs a base de diamant polycristallin/nitrure de bore polycristallin resistants a la corrosion et a l'oxydation pour applications de travail du bois
WO1998015672A1 (fr) * 1995-10-05 1998-04-16 Blz Bayerisches Laserzentrum Gemeinnützige Forsch Ungsgesellschaft Mbh Procede et dispositif de fabrication d'un outil de coupe

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3307170C2 (de) * 1983-03-01 1986-08-14 Wilhelm H. Kullmann WIKUS-Sägenfabrik, 3509 Spangenberg Sägeblatt und Verfahren zu seiner Herstellung
DE3434714A1 (de) * 1984-09-21 1986-04-03 Horst 6450 Hanau Lach Verfahren zur herstellung eines kreissaegeblatts
DE3821894A1 (de) * 1988-06-29 1990-01-04 Metallgesellschaft Ag Bauteil mit auf dessen oberflaeche befindlicher verschleiss- und korrosionsschutzschicht
DD273996A1 (de) * 1988-07-11 1989-12-06 Fz Der Werkzeug Ind Schmalkald Hartstoffbeschichtetes schneidwerkzeug, insbesondere messer zum schneiden von papier, pappe, leder, textilien und chemiefasern

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0290051A2 (fr) * 1987-05-08 1988-11-09 Castolin S.A. Procédé de fabrication d'une lame autoaiguisante
WO1996036465A1 (fr) * 1995-05-15 1996-11-21 Sandvik Aktiebolag Abrasifs a base de diamant polycristallin/nitrure de bore polycristallin resistants a la corrosion et a l'oxydation pour applications de travail du bois
WO1998015672A1 (fr) * 1995-10-05 1998-04-16 Blz Bayerisches Laserzentrum Gemeinnützige Forsch Ungsgesellschaft Mbh Procede et dispositif de fabrication d'un outil de coupe

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20140377021A1 (en) * 2013-06-21 2014-12-25 Albert Knebel Gmbh & Co. Kg Holding Saw blade having a small saw tooth
CN103817412A (zh) * 2014-02-28 2014-05-28 中信重工机械股份有限公司 一种硬岩掘进机的刀盘与刀座的焊接工艺
CN103817412B (zh) * 2014-02-28 2015-12-02 中信重工机械股份有限公司 一种硬岩掘进机的刀盘与刀座的焊接工艺

Also Published As

Publication number Publication date
DE19733483A1 (de) 1999-02-18

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