• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    Methods are provided for manufacturing cutting tools such as twist mills, end mills, and the like. The method includes an end 12, 14 and an elongated side 16 partially or completely covered by an adherent unsintered layer 18 comprising superhard abrasive particles for forming the superhard material. Providing an unbonded assembly comprising a cylindrical core 10, subjecting the ultrahard abrasive to a non-bonded assembly with a crystallographically appropriate high temperature and pressure state, the cylindrical core 10, and the core Restoring the sintered article comprising the ultrahard abrasive material adhered to and processing the sintered article to form one or more cutting edges in the ultrahard abrasive material.
    公开号:KR20030072569A
    申请号:KR10-2003-7008317
    申请日:2001-12-18
    公开日:2003-09-15
    发明作者:프리즈로버트；시갈라스라코보스
    申请人:엘리먼트 씩스 (피티와이)리미티드；
    IPC主号:
    专利说明:

    Cutting tool manufacturing method {METHOD OF MAKING A CUTTING TOOL}
    [2] Cutting tools such as end mills have helical flute ends. Helical flutes provide a cutting edge for the tool. These cutting edges can typically be provided by an abrasive compact, which can be a diamond or cubic boron nitride abrasive compact. Diamond abrasive compacts are known as PCDs. Cubic boron nitride compacts are known as PCBN.
    [3] Many methods of forming helical flutes of cutting tools with abrasive compact cutting edges are known in the art. For example, U. S. Patent No. 5,031, 484 discloses a method of making an end mill in which a spiral groove is formed in a tool blank, wherein the groove is filled with a mixture of diamond powder and cobalt, the blank being a crystallographically suitable high Temperature and pressure conditions are applied. Under these conditions, diamond and cobalt form PCDs in the grooves, which are bonded to the blanks. A disadvantage of this method is that the sintering of the PCD or PCBN into the grooves of the presintered blank causes severe differential shrinkage between the PCD or PCBN phase and the presintered blank. Thus, the depth and possible geometry of the grooves are limited.
    [4] In addition, a strip of PCD or PCBN can be soldered to the helical flute end of such a tool. However, this soldering weakens and severely limits the possible geometry.
    [5] Summary of the Invention
    [6] According to the present invention, there is provided a non-bonded assembly comprising a cylindrical core having an end and a elongated side surface partially or completely covered by an adherent unsintered layer, the layer producing a superhard material. Said ultrahard abrasive particles for applying to said non-bonded assembly, wherein said ultrahard abrasive is crystallographically suitable high temperature and pressure conditions, said cylindrical core and said superhard abrasive material adhered to said core. Recovering a sintered product comprising: and processing the sintered product to form one or more cutting edges in the ultrahard abrasive material.
    [7] The layer covering at least a portion of the elongate side is an adhesive and unsintered, ie raw layer. Adhesion means that shape is maintained on the surface; unsintered means that no form of high temperature and pressure is applied to the non-bonded assembly. In general, the layer comprises particles adhered by a binder such as an organic binder. One example of a suitable organic binder is methyl cellulose.
    [8] In one embodiment of the present invention, the layer is one of particle / solvent / catalyst alone or ultrahard abrasive particles including the same, and covers the entire long side of the core. The sintered article produced comprises a cylindrical core and an ultrahard material bonded to the core and covering the long entire side of the core. The cutting edge is formed by removing some of the hard material. Preferably, such removal forms two or more spaced apart areas of superhard material, each area exhibiting at least one cutting edge that is preferably curved, helical or twisted.
    [9] In another form of the invention, the layer comprises a component suitable for forming the same material as the core and comprises one or more vanes of ultrahard abrasive particles suitable for forming the ultrahard material. Preferably, the vanes extend longitudinally from one end of the core to the other end and may form a curved, spiral or twisted shape. One or more cutting edges of the superhard material are formed by removing at least a portion of the core material from the sintered layer in the sintered article.
    [10] The ultrahard material may generally be PCD or PCBN. To prepare such materials, the ultrahard abrasive particles may be diamond particles or cubic boron nitride particles containing only suitable solvents / catalysts in the form of particles or preferably.
    [11] The ultrahard material may also be cement bonded carbide in which discrete superhard abrasive particles, such as diamond or cubic boron nitride, are dispersed therein. To prepare such materials, a particle mixture of carbide particles, metal binders and ultrahard abrasive particles is prepared, forming an adherent unsintered layer.
    [12] Typically, the core may be a material such as cemented carbide or iron, which may be in sintered or unsintered form before high temperature and pressure conditions are applied.
    [1] The present invention relates to a method of manufacturing a cutting tool.
    [13] 1 and 2 are perspective views of a first embodiment of the present invention,
    [14] 3 is a perspective view of a second embodiment of the present invention;
    [15] A first embodiment of the invention is shown in FIGS. 1 and 2. Referring to FIG. 1, a non-bonded assembly is shown for use in making a cutting tool. The assembly includes a core 10 having planar end surfaces 12, 14 and elongated curved sides 16. The entire side 16 is covered by layer 18.
    [16] The core 10 is typically made of cemented carbide, such as cemented tungsten carbide or iron. The core 10 may be in sintered or unsintered form.
    [17] Layer 18 is a raw layer that is adhesive and not sintered, i.e., has not been subjected to high temperature and pressure conditions. Layer 18 includes the ultrahard abrasive particles needed to produce the ultrahard material. The abrasive particles can be mixed with other particles, such as particles of a suitable solvent / catalyst. The particles are adhered in adherent form by a binder such as an organic binder. One example of a suitable organic binder is methyl cellulose.
    [18] The non-glued assembly is then placed in the reaction capsule of a conventional high temperature / high pressure device. A material such as salt may be used to pack the assembly into the capsule. The capsule is placed in the reaction zone of the device and the superhard abrasive is subjected to a high temperature and pressure condition that is crystallographically appropriate. Preferred superhard abrasives are diamond. In this case, the high temperature is typically in the range of 1400 ° C. to 1700 ° C., and the high pressure is in the range of 4 GPa to 7 GPa. Under these conditions, the layer 18 sintered and adhered to the core is PCD. To produce the PCD, the diamond particles are mixed with cobalt or other diamond solvents / catalysts in particulate form.
    [19] If the assembly to which the core 10 is not bonded is not sintered before being inserted into the reaction capsule, the sintering of the core is achieved by applying a high temperature and pressure condition.
    [20] The sintered product is removed from the capsule using conventional and known techniques. The sintered article has an outer sintered layer of ultrahard material, such as PCD, firmly adhered to the core. The sintered article has the same shape as the unsintered article of FIG. 1, and the sintered superhard material is layer 18. Twisted or helical grooves 20 may be formed in the sintered layer 18 by cutting, polishing or the like as shown in FIG. As a result, a flute 22 of ultrahard material is formed. Edges 24 and 26 of the flute 22 provide cutting edges for the tool.
    [21] A second embodiment of the invention is shown in FIG. Referring to FIG. 3, an unbonded assembly for use in manufacturing a cutting tool includes a core 30 having flute ends 32, 34 and an elongated curved side 36. The entire side 36 is covered by layer 38.
    [22] Typically the core 30 is made of cemented carbide, such as cemented tungsten carbide or iron. Core 30 may be in sintered or unsintered form.
    [23] Layer 38 is a raw layer and is adherent and unsintered, i.e., has not been subjected to high temperature and pressure conditions. Layer 38 includes two regions 40, 42. Region 40 includes the components necessary to produce the same material as the material of the core. These components are adhered in adherent form by a binder of the type described above. The second region 42 contains the ultrahard abrasive particles needed to produce the ultrahard material.
    [24] The non-bonded assembly is placed in the reaction capsule of a conventional high temperature / high pressure device. A material such as salt may be used to pack the assembly into the capsule. The capsule is placed in the reaction zone of the device, and the superhard abrasive particles are subjected to a high temperature and pressure condition that is crystallographically appropriate. These states cause the components in region 40 to sinter and the components in region 42 to sinter and form an ultrahard material. If the core 30 is in an unsintered form, the core is sintered simultaneously.
    [25] The sintered product is removed from the capsule using conventional and known techniques. The sintered article has the same shape as that shown in FIG. 3, and the sintered outer layer includes two sintered regions 40, 42 that are firmly bonded to the core and to each other. The helical flute is formed by removing the sintered region 40 between the continuous regions 42, for example by polishing. Thus, the manufactured product is basically the same as that shown in FIG.
    [26] The invention is particularly applicable to cutting tools such as twist mills, end mills and the like.
    权利要求:
    Claims (14)
    [1" claim-type="Currently amended] In the method of manufacturing a cutting tool,
    Providing an unbonded assembly comprising a cylindrical core having an end and a long side that is partially or fully covered by an adherent unsintered layer, the layer comprising an ultrahard polishing for producing an ultrahard material Comprising the particles,
    Applying an ultrahard abrasive to the non-bonded assembly with a crystalline, moderately high temperature and pressure state,
    Recovering a sintered product comprising a cylindrical core and an ultrahard abrasive material adhered to the core;
    Processing the sintered article to form one or more cutting edges in the ultrahard abrasive material
    Cutting tool manufacturing method.
    [2" claim-type="Currently amended] The method of claim 1,
    The cutting edge or edges extending from one end of the core to the other end
    Cutting tool manufacturing method.
    [3" claim-type="Currently amended] The method according to claim 1 or 2,
    The cutting edge or edges are curved, helical or twisted
    Cutting tool manufacturing method.
    [4" claim-type="Currently amended] The method according to any one of claims 1 to 3,
    In the sintered article, the layer is a layer of ultrahard material that completely covers the long side, wherein the cutting edge or edges are formed in the layer of ultrahard abrasive material by removing a portion of the material.
    Cutting tool manufacturing method.
    [5" claim-type="Currently amended] The method of claim 4, wherein
    The removal of the material forms two or more spaced apart areas of superhard material, each area having at least one cutting edge formed therein.
    Cutting tool manufacturing method.
    [6" claim-type="Currently amended] The method of claim 5,
    The cutting edge is curved, helical or twisted
    Cutting tool manufacturing method.
    [7" claim-type="Currently amended] The method according to any one of claims 1 to 3,
    The layer comprises a component suitable for producing the same material as the core and comprises one or more vanes of ultrahard abrasive particles for producing the ultrahard material, the cutting edge or edges being sintered in the sintered product Generated by removing at least a portion of the core material from the layer
    Cutting tool manufacturing method.
    [8" claim-type="Currently amended] The method of claim 7, wherein
    The vanes or vanes extend longitudinally from one end to the other end of the core
    Cutting tool manufacturing method.
    [9" claim-type="Currently amended] The method according to claim 7 or 8,
    The vanes or vanes form a curved, spiral or twisted shape
    Cutting tool manufacturing method.
    [10" claim-type="Currently amended] The method according to any one of claims 1 to 9,
    The core material is cemented carbide or iron
    Cutting tool manufacturing method.
    [11" claim-type="Currently amended] The method according to any one of claims 1 to 10,
    The ultrahard material is PCD or PCBN
    Cutting tool manufacturing method.
    [12" claim-type="Currently amended] The method according to any one of claims 1 to 11,
    The ultrahard material comprises cement bonded carbide with discrete ultrahard abrasive particles dispersed therein
    Cutting tool manufacturing method.
    [13" claim-type="Currently amended] The method of claim 12,
    The ultrahard abrasive particles are diamond or cubic boron nitride
    Cutting tool manufacturing method.
    [14" claim-type="Currently amended] The method of claim 1,
    As substantially disclosed with reference to any one of Figures 1 to 3 of the accompanying drawings
    Cutting tool manufacturing method.
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    同族专利:
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    EP1351798A1|2003-10-15|
    JP4235449B2|2009-03-11|
    CA2432466C|2009-08-18|
    DE60127305D1|2007-04-26|
    US20040093989A1|2004-05-20|
    AU1941602A|2002-07-01|
    EP1351798B1|2007-03-14|
    WO2002049801A1|2002-06-27|
    DE60127305T2|2007-12-20|
    US7104160B2|2006-09-12|
    JP2004516152A|2004-06-03|
    CA2432466A1|2002-06-27|
    KR100829275B1|2008-05-13|
    ZA200304641B|2004-07-19|
    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
    法律状态:
    2000-12-21|Priority to ZA2000/7772
    2000-12-21|Priority to ZA200007772
    2001-12-18|Application filed by 엘리먼트 씩스 (피티와이)리미티드
    2001-12-18|Priority to PCT/IB2001/002553
    2003-09-15|Publication of KR20030072569A
    2008-05-13|Application granted
    2008-05-13|Publication of KR100829275B1
    优先权:
    申请号 | 申请日 | 专利标题
    ZA2000/7772|2000-12-21|
    ZA200007772|2000-12-21|
    PCT/IB2001/002553|WO2002049801A1|2000-12-21|2001-12-18|Method of making a cutting tool|
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