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CN101336311A - Pcbn切削工具组件 - Google Patents

Pcbn切削工具组件 Download PDF

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CN101336311A
CN101336311A CNA2006800519515A CN200680051951A CN101336311A CN 101336311 A CN101336311 A CN 101336311A CN A2006800519515 A CNA2006800519515 A CN A2006800519515A CN 200680051951 A CN200680051951 A CN 200680051951A CN 101336311 A CN101336311 A CN 101336311A
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pcbn
layer
working
tool assembly
thickness
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C·J·比勒陀利乌斯
P·M·哈登
T·P·霍华德
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Element Six Production Pty Ltd
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    • C23C30/00—Coating with metallic material characterised only by the composition of the metallic material, i.e. not characterised by the coating process
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
    • B22F7/00—Manufacture of composite layers, workpieces, or articles, comprising metallic powder, by sintering the powder, with or without compacting wherein at least one part is obtained by sintering or compression
    • B22F7/06—Manufacture of composite layers, workpieces, or articles, comprising metallic powder, by sintering the powder, with or without compacting wherein at least one part is obtained by sintering or compression of composite workpieces or articles from parts, e.g. to form tipped tools
    • B22F7/062—Manufacture of composite layers, workpieces, or articles, comprising metallic powder, by sintering the powder, with or without compacting wherein at least one part is obtained by sintering or compression of composite workpieces or articles from parts, e.g. to form tipped tools involving the connection or repairing of preformed parts
    • 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
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    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23B—TURNING; BORING
    • B23B27/00—Tools for turning or boring machines; Tools of a similar kind in general; Accessories therefor
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23B—TURNING; BORING
    • B23B27/00—Tools for turning or boring machines; Tools of a similar kind in general; Accessories therefor
    • B23B27/14—Cutting tools of which the bits or tips or cutting inserts are of special material
    • B23B27/141—Specially shaped plate-like cutting inserts, i.e. length greater or equal to width, width greater than or equal to thickness
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23C—MILLING
    • B23C3/00—Milling particular work; Special milling operations; Machines therefor
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    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23C—MILLING
    • B23C5/00—Milling-cutters
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    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
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    • 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
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    • B23D61/00—Tools for sawing machines or sawing devices; Clamping devices for these tools
    • B23D61/18—Sawing tools of special type, e.g. wire saw strands, saw blades or saw wire equipped with diamonds or other abrasive particles in selected individual positions
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
    • B27G—ACCESSORY MACHINES OR APPARATUS FOR WORKING WOOD OR SIMILAR MATERIALS; TOOLS FOR WORKING WOOD OR SIMILAR MATERIALS; SAFETY DEVICES FOR WOOD WORKING MACHINES OR TOOLS
    • B27G13/00—Cutter blocks; Other rotary cutting tools
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
    • B27G—ACCESSORY MACHINES OR APPARATUS FOR WORKING WOOD OR SIMILAR MATERIALS; TOOLS FOR WORKING WOOD OR SIMILAR MATERIALS; SAFETY DEVICES FOR WOOD WORKING MACHINES OR TOOLS
    • B27G15/00—Boring or turning tools; Augers
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C26/00—Alloys containing diamond or cubic or wurtzitic boron nitride, fullerenes or carbon nanotubes
    • 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
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    • C23C30/00—Coating with metallic material characterised only by the composition of the metallic material, i.e. not characterised by the coating process
    • C23C30/005—Coating with metallic material characterised only by the composition of the metallic material, i.e. not characterised by the coating process on hard metal substrates
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
    • B22F5/00—Manufacture of workpieces or articles from metallic powder characterised by the special shape of the product
    • B22F2005/001—Cutting tools, earth boring or grinding tool other than table ware
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23B—TURNING; BORING
    • B23B2200/00—Details of cutting inserts
    • B23B2200/12—Side or flank surfaces
    • B23B2200/125—Side or flank surfaces discontinuous
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23B—TURNING; BORING
    • B23B2200/00—Details of cutting inserts
    • B23B2200/12—Side or flank surfaces
    • B23B2200/125—Side or flank surfaces discontinuous
    • B23B2200/126—Side or flank surfaces discontinuous stepped
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23B—TURNING; BORING
    • B23B2226/00—Materials of tools or workpieces not comprising a metal
    • B23B2226/12—Boron nitride
    • B23B2226/125—Boron nitride cubic [CBN]
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23B—TURNING; BORING
    • B23B2226/00—Materials of tools or workpieces not comprising a metal
    • B23B2226/31—Diamond
    • B23B2226/315—Diamond polycrystalline [PCD]
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    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23B—TURNING; BORING
    • B23B2228/00—Properties of materials of tools or workpieces, materials of tools or workpieces applied in a specific manner
    • B23B2228/10—Coatings
    • B23B2228/105—Coatings with specified thickness
    • 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
    • B26D2001/0053—Cutting members therefor having a special cutting edge section or blade section
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C2204/00—End product comprising different layers, coatings or parts of cermet
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T407/00—Cutters, for shaping
    • Y10T407/27—Cutters, for shaping comprising tool of specific chemical composition
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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    • Y10T408/78—Tool of specific diverse material
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    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T409/00—Gear cutting, milling, or planing
    • Y10T409/30—Milling
    • Y10T409/303752—Process
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
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Abstract

一种切削工具组件(10)，包括本体，该本体包括硬质合金基体(12)，并且具有至少一个工作表面(14)，至少一个工作表面呈现用于本体的切削刃或区域(16)，至少一个工作表面(14)包括与切削刃或区域(16)相邻的并且从至少一个工作表面延伸到不大于0.2mm的深度的PCBN，并且其中，基体(12)具有1.0mm至40mm的厚度。

Description

PCBN切削工具组件
技术领域
本发明涉及超硬切削工具组件，并且更具体地说，涉及PCBN切削工具组件。
背景技术
氮化硼典型地以三种晶体形式存在，即立方氮化硼(CBN)、六方氮化硼(hBN)及wurtzitic立方氮化硼(wBN)。立方氮化硼是具有与金刚石的结构相类似的结构的硬锌混合形式的氮化硼。在CBN结构中，在原子之间形成的键坚固，主要是共价四面体型键。
CBN在机加工工具等方面具有广泛商业用途。它在砂轮、切削工具等中用作磨粒，或者使用常规电镀技术结合到工具本体上以形成工具嵌入件。
CBN也可以以结合形式用作CBN压坯，也称作PCBN(多晶体CBN)。CBN压坯包括烧结的大量CBN颗粒。当CBN含量按压坯的体积超过百分之八十时，有相当大量的CBN对CBN接触。当CBN含量较低时，例如按压坯的体积在百分之四十至六十的范围中，直接CBN对CBN接触的程度受到限制。
CBN压坯一般也包含粘合剂，该粘合剂在包含铝、钴、镍、钨及钛的压坯中包含一个或多个陶瓷相。
CBN压坯往往具有良好的磨损性，是热稳定的，具有较高导热率、良好的耐冲击性，及当与工件接触时具有低摩擦系数。CBN压坯，有或没有基体，常常切成待使用的具体切削或钻削工具的希望尺寸和/或形状，并且然后利用钎焊技术安装到工具本体上。
当压坯的CBN含量按体积小于百分之七十时，基体相，即非CBN相，将典型地也包含辅助或次级硬相(secondary hard phase)，该硬相在本质上可以是陶瓷。适当陶瓷硬相的例子是硬质合金、氮化物、硼化物及族4、5或6(根据新IUPAC格式)过渡金属氧化铝和其混合物的碳氮化物。基体相构成在排除CBN的组分中的所有成分。
CBN压坯在工具嵌入件或工具的形成时可以直接结合到工具本体上。然而，对于多种用途，优选的是，压坯结合到基体/支撑材料上，形成支撑压坯结构，及然后支撑压坯结构结合到工具本体上。基体/支撑材料典型地是与诸如钴、镍、铁或其混合物或合金之类的粘合剂结合在一起的硬质合金。金属硬质合金颗粒可以包括钨、钛或钽硬质合金颗粒或其混合物。
用来制造多晶体CBN压坯和支撑压坯结构的已知方法涉及使未烧结的大量CBN颗粒以及粉末化基体相经受高温和高压状态，即对于适当的时间段在这种条件下CBN是结晶学或热动态稳定的状态。使用的典型高温和高压状态是在1100℃或更高的范围中的温度和2GPa或更高量级的压力。用来保持这些状态的时间段典型地是约3至120分钟。
具有大于七十体积百分比的CBN含量的CBN压坯称作高CBNPCBN材料。它们被广泛地用在用来加工灰铸铁、白铸铁、粉末冶金钢、工具钢及高锰钢的切削工具的制造中。除使用状态之外，如切削速度、进给和切削的深度，PCBN工具的性能一般已知取决于工件的几何形状，并且特别是取决于工具是否在延长时间段内恒定地结合工件-在现有技术中称作“连续切削”，或工具是否以断续方式结合工件-在现有技术中称作“断续切削”。
商业上可获得的PCBN切削工具都具有厚度为0.2mm以上的烧结PCBN层。这些厚PCBN层处理困难和昂贵。因PCBN切削工具的制造成本因而使它太昂贵，以致在硬质合金切削工具市场不能成功地竞争。对于为典型硬质合金用途待考虑的PCBN，它必须处理更容易和更便宜，并且具有更高抗破碎能力，而在耐磨性方面仍然超过硬质合金。
美国专利no.5,697,994描述了一种用于木材加工用途的切削工具，该切削工具包括在硬质合金基体上的PCD或PCBN层。PCD在粘结相中一般设有耐腐蚀或耐氧化辅助合金材料。其中提供的例子是PCD层厚度为0.3mm。对于PCBN，层厚度优选地为0.3mm至0.9mm。
发明内容
本发明的切削工具组件包括本体，该本体包括硬质合金基体，并且具有至少一个工作表面，至少一个工作表面呈现用于本体的切削刃或区域，其特征在于，至少一个工作表面包括与切削刃或区域相邻的并且从至少一个工作表面延伸到不大于0.2mm的深度的PCBN，并且其中，基体具有1.0mm至40mm的厚度。
在本发明的一个优选实施例中，切削工具组件本体包括硬质合金基体和结合到基体的主要表面上的超薄PCBN层，超薄PCBN层具有一般不大于0.2mm的厚度，并且基体具有在1.0mm至40mm之间的厚度。
在本发明的可选择优选实施例中，一个或多个中间层位于硬质合金基体与PCBN层之间，优选地基于比PCBN软的陶瓷、金属或超硬材料或它们的组合。
在本发明的另一个可选择优选实施例中，切削工具组件本体包括硬质合金基体，该硬质合金基体具有呈现用于工具组件的切削刃或区域的工作表面，并且具有从工作表面延伸到基体中的多个凹槽或凹口和位于相应凹槽或凹口中的多个带或多块超硬材料，布置是这样的，从而PCBN从工作表面延伸到不大于0.2mm的深度，并且形成工具组件的切削刃或区域的部分。
PCBN层或嵌入件的厚度或深度优选地从0.001mm至0.15mm。
PCBN可选择性地包含第二相，该第二相包括从包括铝、钴、铁、镍、铂、钛、铬、钽、铜、钨或其合金或混合物的组中选择的金属或金属化合物。
附图说明
现在参照附图仅作为例子更详细地描述本发明，在附图中：
图1是本发明的切削工具组件的第一实施例的部分立体图；
图2是本发明的切削工具组件的第二实施例的部分立体图；
图3是本发明的切削工具组件的第三实施例的部分立体图；
图4是在使用中的本发明的切削工具组件的侧视图，表明其“自动磨锐”作用；
图5是曲线图，表示对于两种PCBN切削工具在轻间歇机加工条件下的屑(chip)尺寸；及
图6是箱式图，表明对于两种PCBN切削工具的抗破裂性。
具体实施方式
本发明的目的是提供一种具有以在硬质合金与PCBN之间的性能而设计的PCBN切削工具。
该目的通过提供一种切削工具组件10而实现，如例如在图1中表明的那样，该切削工具组件10包括带有超薄PCBN层14的硬质合金基体12，该超薄PCBN层14具有不大于、一般小于0.2mm的厚度，优选地在0.001-0.15mm之间；并且其中，基体具有从1.0-40mm的厚度。这样一种切削工具组件通过高温高压合成而生产。在切削刃16处的超薄硬层14的厚度是确定材料性能的关键参数，并且允许既用顶部硬层14(PCBN)又用硬质合金基体12切削。抗磨性、抗破碎性、切削力、磨削性、EDM能力及热稳定性都是由硬层的厚度影响的性能。存在用来用硬质合金基体生产PCBN切削工具的各种方法，这些方法在工业上是熟知的。
超薄硬层与较软基体一起在切削期间产生“自锐”特性，这又减小在切削刃处的力和温度。硬层是上述类型的高或低CBN含量PCBN。硬层的厚度依据对于具体用途的要求性能优选地在0.001-0.15mm之间变化。
参照图2的工具组件30，超薄硬层32也可结合到金属、陶瓷、或超硬材料的中间较软层34上，该中间较软层34又结合到硬质合金基体36上。
可选择地，参照在图3中所表明的工具组件40，超薄硬层也可以是带42(竖直层)的形式，该带横过与基体材料44交替的切削工具，其中带的宽度46在10与50微米之间。也想到其中下凹PCBN片位于基体材料中的其它布置。
基体材料可从碳化钨、超细粒碳化钨、碳化钛、碳化钽及碳化铌中选择。用来生产硬质合金的方法在工业上是熟知的。因为切削既用PCBN又用硬质合金进行，所以基体的选择是另一个变量，该变量可被改变以便改变切削组件的性能以适合不同用途。
在某些用途中，优选的可能是，提供具有成轮廓或成形表面的基体，这生成与互补形状或轮廓的界面。
从加工性能观点看，本发明的关键特征是将降低PCBN切削工具的处理成本的超薄硬层。
就性能而论，本发明的关键特征是调节硬层厚度，从而可实现希望的性能并且也保证在切削期间“自锐”作用发生。这可能意味着刚好在PCBN下面添加较软的陶瓷或金属中间层。这意味着当磨损在切削过程期间的某一阶段通过硬层进行时，切削将通过硬层和基体和/或中间层进行。常规工具都具有高于0.2mm的硬层厚度，并因此基体永远不与工件接触(因为工具寿命标准是VBB最大＝0.2-0.3mm)，并且工具的性能和特性只是硬层的性能和特性。
如在图4中表明的那样，只要切削由硬层14进行，磨损速率就是硬层的磨损速率。磨损一延伸到硬质合金基体12中并且切削由PCBN和硬质合金进行，磨损速率就将增大以包括基体的和硬层的磨损速率。因而，硬层越厚，磨损速率由硬层的耐磨性控制得越长，并且工具寿命越长。在由硬层和硬质合金进行切削的地方具有超薄硬层给出在硬质合金与硬层的耐磨性之间的耐磨性。通过改变硬层的厚度(在0.001-0.15mm之间)，它允许人们把材料的性能和工具寿命变到对于具体用途要求的性能和工具寿命。这允许人们为具体用途提供特征产品。硬层越薄，切削工具性能将越接近基体的性能。然而，由于工程切削工具的“自锐”作用，切削过程和磨损速率由硬层支配。
用超薄硬层14和基体12切削的好处是它对于工具具有“自锐”作用。如在图4中表明的那样，可看到，因为基体12的材料比顶部硬层14软得多，所以它磨损掉得比硬层14快，在硬层与底部层之间于刃16处形成“刀刃”18。这允许工具主要用顶部硬层14切削，使与工件的接触面积最小，这最终导致在切削刃16处的较低的力和温度。它也意味着，当工具磨损时，它保持允许它较高效地切削的后角(α)。这种磨损特性对于粗加工用途和木材合成物加工是理想的，特别是在锯片用途中，在该处尺寸公差不太关键。它在油钻探用途中也是有益的，在该处锋利刀具导致较低“在钻头上的重量”和较高钻进速度。它在钢铁材料的加工中也是有益的。
超薄硬层的另一个好处是它给工具改进的切削阻力。较厚层具有较高残余应力，并且更易于剥落和破裂。而且，如果剥落发生，硬质合金基体将阻止开裂并且停止它变得比顶部硬层的厚度大。
对于加工性的影响
当顶部硬层变得较薄时，所有处理(EDM、EDG、磨削)都更容易和更快。具有超薄硬层将缩短处理时间。
如较早解释的那样，常规PCBN压坯以PCBN层厚度＞0.2mm制造，以便切削只由硬层进行。然而，在这样的厚层的合成期间，压坯因为在PCBN与硬质合金基体之间的热膨胀差异常常成弓形。这导致辅助处理(机械磨削，EDG或研磨)以使压坯变平。借助于超薄硬层，使盘的弯曲最小化并且不需要另外处理。这可以供近净成形PCBN压坯的生产用。
现在仅作为例子参照如下非限制例子，将进一步讨论本发明。这些例子表示超薄PCBN切削工具组件的优点。在例子中使用的PCBN切削工具组件由在现有技术中熟知的并且如以上所描述的PCBN制造方法制成。
例1：AISI4340“钻削”轻间断加工试验
相信试验足以代表硬加工。以上描述类型的两个PCBN切削工具组件被用在试验中。一个具有0.1mm厚度的超薄PCBN层，并且另一个具有0.5mm厚度的PCBN层。记录最大屑尺寸。试验条件如下：
  试验   进给量f(mm)   切削深度ap(mm)   切削速度vc(m/min)   嵌入件几何形状
  (AISI)4340钻削正面旋转   0.15   0.2   150   SNMN090308S0220
由图5的曲线图可看到，超薄PCBN层比较厚0.5mm层呈现较少破裂。如PCD的情况是，一旦破裂路径到达硬质合金，在刃上的实际的屑就获得“阻止”。从此处起，磨损是关键特征，并且不破裂。
例2：粗加工例子：机加工致压坯石墨铸铁(CGI)的灾难性抗破裂性
使用例1的相同两个PCBN切削工具组件进行中断的铣削操作，由此，把条件和工件选择成使任何磨损事件最小化并且回过来促进破裂。每齿的进给量从0.1至0.2至0.3等而增加，直到观察到鼻部的灾难性失效。每齿的进给量代表在切削刃上的负载，并因此是适当的抗破裂性指示物。使用过的试验条件如下：
-工件材料：GJV 400(＞95％珠光体、10％球化性)
-切削速度：300m/min
-每齿的进刀：变化
-DOC：1mm
-WOC：1/2块
-后角：18度
-前角：0度
由图6的箱式图显然，01层比05层具有较高抗破裂性。由于这种数据不是正态分布的，所以进行Kruskal-Wallis统计试验，以估计这种改进是否是显著的。由于P值小于0.05，所以可得到结论，薄层比0.5mm层更显著地抗破裂。
Kruskal-Wallis试验：Fz失效对工具材料的关系
对于Fz失效的Kruskal-Wallis试验
  工具材料   N   中值   平均级别   Z
  PCBN01   5   0.5000   7.5   2.09
  PCBN05   5   0.3000   3.5   -2.09
  综合   10   5.5
H＝4.36 DF＝1 P＝0.037
H＝4.50 DF＝1 P＝0.034(用于联系(ties)而被调节)

Claims (8)

1.一种切削工具组件，其包括本体；该本体包括硬质合金基体，并且具有至少一个工作表面，所述至少一个工作表面呈现用于所述本体的切削刃或区域，其特征在于，所述至少一个工作表面包括与切削刃或区域相邻的并且从所述至少一个工作表面延伸到不大于0.2mm的深度的PCBN，并且其中，所述基体具有1.0mm至40mm的厚度。
2.根据权利要求1所述的工具组件，其中，所述本体包括硬质合金基体和结合到基体的主要表面上的超薄PCBN层，超薄PCBN层具有不大于0.2mm的厚度，并且所述基体具有在1.0mm与40mm之间的厚度。
3.根据权利要求2所述的工具组件，其中，超薄PCBN层的厚度小于0.2mm。
4.根据权利要求2或权利要求3所述的工具组件，其中，一个或多个中间层位于硬质合金基体与PCBN层之间，所述中间层比超薄层的PCBN软。
5.根据权利要求4所述的工具组件，其中，中间层是陶瓷、金属或超硬材料或它们的组合。
6.根据权利要求1所述的工具组件，其中，本体包括硬质合金基体，该硬质合金基体具有呈现用于工具组件的切削刃或区域的工作表面，并且具有从工作表面延伸到基体中的多个槽或凹口和位于相应槽或凹口中的多个PCBN的带或PCBN的块，所述布置使得PCBN从工作表面延伸到不大于0.2mm的深度，并且形成工具组件的切削刃或区域的部分。
7.根据前述权利要求的任一项所述的工具组件，其中，PCBN层、块或带的厚度或深度从0.001mm至0.15mm。
8.根据权利要求1所述的工具组件，大体如这里参照附图的图1至6中任一个所描述的那样。
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EP1960140A2 (en) 2008-08-27
WO2007069030A1 (en) 2007-06-21
US20090126541A1 (en) 2009-05-21
WO2007069029A1 (en) 2007-06-21
US20140251100A1 (en) 2014-09-11
WO2007069025A2 (en) 2007-06-21
BRPI0620677A2 (pt) 2011-11-22
CN101336145A (zh) 2008-12-31

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