CN102847962B - The excellent resistance to surface-coated cutting tool that collapses cutter of hard coating layer performance - Google Patents
The excellent resistance to surface-coated cutting tool that collapses cutter of hard coating layer performance Download PDFInfo
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- CN102847962B CN102847962B CN201210225549.1A CN201210225549A CN102847962B CN 102847962 B CN102847962 B CN 102847962B CN 201210225549 A CN201210225549 A CN 201210225549A CN 102847962 B CN102847962 B CN 102847962B
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Abstract
The invention provides the excellent resistance to surface-coated cutting tool that collapses cutter, resistance to damaged property of hard coating layer performance in the processing of high speed heavy cut. By formation as described below, technical solution problem,, hard coating layer comprises the lower layer and the upper layer that are formed by chemical vapor deposition, (a) described lower layer, for at least comprising the carbonitride layer of one deck Ti and comprising that having 3 ~ 20 μ m amounts to one deck of average bed thickness or more than two layers Ti compound layers, (b) described upper layer, for thering is the alumina layer of average bed thickness of 1 ~ 25 μ m, the carbonitride layer that forms the Ti of at least one deck of described lower layer has column longitudinal growth TiCN crystalline structure, is distributed with particulate TiCN in this tissue.
Description
Technical field
The present invention relates to surface-coated cutting tool (hereinafter referred to as coating tool), producing and high load capacity with high heatAct on the various steel of cutting edge or the high speed heavy cut of cast iron adds man-hour, because hard coating layer possesses excellent resistance to collapsingCutter, therefore through the long-term excellent cutting ability of performance that uses.
Background technology
In the past conventionally knownly (use below TiCN at tungsten carbide (representing with WC below) base cemented carbide or titanium carbonitrideRepresenting) surface of tool base (below these being referred to as to tool base) that forms of based ceramic metal forms by followingThe coating tool that the hard coating layer that lower layer (a) and upper layer (b) form forms, and known this coating toolBe used in the machining of various steel or cast iron etc.
(a) lower layer: be carbide (representing with the TiC below) layer that comprises the Ti all being formed by chemical vapor deposition,Nitride (representing with TiN equally below) layer, carbonitride (representing with TiCN below) layer, oxycarbide (withRepresent with TiCO down) one deck or two layers of above Ti in layer and carbon nitrogen oxide (representing with TiCNO below) layerCompound layer,
(b) upper layer: for the aluminium oxide being formed by chemical vapor deposition (is used Al below2O3Represent) layer.
But, above-mentioned coating tool exist under larger load puts on the machining condition of cutting edge, easily produce collapse cutter,The problem that damaged grade and life tools are shorter and so on, therefore, in order to eliminate this problem, has proposed several motions at present.
For example, following motion has been proposed in patent documentation 1: individual layer or two layers of above lamination by TiCN formHard coating layer, and one deck in these constituting layers or two layers of above appointing by following (a) and (b) and (c)One or more the crystalline texture of anticipating forms, thereby improves the resistance to cutter that collapses of coating tool. (a) be by granular knotBrilliant tissue is converted to the crystalline texture of longitudinal growth crystalline structure, (b) for to be converted to longitudinal growth by granular crystal tissueCrystalline structure and then be converted to the crystalline texture of granular crystal tissue by this longitudinal growth crystalline structure, (c) serves as reasons verticalBe converted to the crystalline texture of granular crystal tissue to growth crystalline structure.
In addition, following motion has been proposed in patent documentation 2: hard coating layer is by the list of the TiCN layer that contains column crystalLayer or multilayer form, and having apart from the upper end of this TiCN layer is the TiCN of 1/5 distance and position of this TiCN layer thicknessThe average grain diameter d1 of the horizontal direction of columnar grain be 2/5 of this TiCN layer thickness apart from the lower end of this TiCN layerThe ratio of the average grain diameter d2 of the horizontal direction of the TiCN columnar grain of distance and position forms the formation of 1≤d1/d2≤1.3,Thereby provide the coating tool of standing the long-time machining that comprises interrupted cut.
Patent documentation 1: Japanese kokai publication hei 6-8009 communique
Patent documentation 2: Japanese kokai publication hei 10-109206 communique
Present situation is in recent years as follows: the requirement to the saving labourization in machining and energy-saving is strong, with this, and bagThe instrument that covers is using under exacting terms gradually more, for example, even the coated work shown in described patent documentation 1,2Tool, adds man-hour at the high speed heavy cut being used in high heat produces and high load capacity further acts on cutting edge, byResistance to mechanical impact property, resistance to sudden heating in lower layer are insufficient, so the high load capacity also can be because of machining time holdsEasily on cutting edge, produce and collapse cutter, damaged, its result reaches service life within a short period of time.
Summary of the invention
Therefore, the inventor etc. from the above point of view, even to producing and high load capacity is done being used in high heatAdd man-hour for the high speed heavy cut of cutting edge, also because hard coating layer possesses excellent toughness, resistance toly collapses cutter and warpThe long-term coating tool that uses the excellent mar proof of performance conducts in-depth research, and result has obtained following opinion.
,, as hard coating layer, comprise the hard bag of the lower layer of the carbonitride layer of Ti in described formation in the pastIn coating, the carbonitride layer of Ti with matrix vertical direction on form with column. Therefore, hardness and mar proofImprove, but the toughness of the carbonitride layer of the higher Ti of anisotropy of the carbonitride layer of contrary Ti more reduces,Result cannot be brought into play resistance to cutter, the mar proof of collapsing fully, can not say life tools in addition gratifying.
Therefore, the carbon nitrogen of the particularly Ti in the Ti compound layer of the lower layer of the inventor to formation hard coating layerCompound layer conducts in-depth research, and found that following new opinion: by relax Ti carbonitride layer respectively toThe opposite sex improves toughness, can improve resistance to cutter, the resistance to damaged property of collapsing of hard coating layer.
Specifically, the carbonitride layer of the Ti of at least one deck of formation lower layer has column longitudinal growth TiCN knotBrilliant tissue is distributed with particulate TiCN in this tissue, therefore can relax the anisotropy of the carbonitride layer of Ti,Can improve toughness.
And the carbonitride layer of the Ti of above-mentioned formation for example can be by following chemical vapor deposition method film forming.
On tool base surface, form (capacity %) as TiCl taking reacting gas4: 1.7 ~ 1.9%, TDMAT(tetra-(twoMethylamino) titanium): 0.01 ~ 0.05%, CH3CN：0.7~0.9%、N2：20%、H2: residue, reaction atmosphere is pressedPower is 5 ~ 12kPa, and reaction atmosphere temperature is 800 ~ 950 DEG C and carries out chemical vapor deposition method, thereby can obtain particulate TiCNBe distributed to the column longitudinal growth TiCN crystalline structure in film. At this, in the present invention, particulate TiCN refers to granularThe phase of mixing of TiCN crystalline phase, amorphous TiCN phase or granular TiCN crystalline phase and amorphous TiCN phase.,, according to the subtle difference of membrance casting condition, confirm during by the carbonitride layer film forming of Ti by above-mentioned chemical vapor deposition methodDisperse to be formed on the amorphous TiCN phase in situation, (2) that the particulate TiCN in film is (1) granular TiCN crystalline phaseThe situation of mixing phase of the granular TiCN crystalline phase in situation, (3) and amorphous TiCN phase. And, can confirmMake in any one situation in above-mentioned (1) to (3), also can relax above-mentioned Ti carbonitride layer respectively to differentProperty, the effect that toughness is improved does not have significant difference. Therefore, in the present invention, by above-mentioned (1) to (3) general nameFor particulate TiCN.
And find, the number density in the cross section of the particulate TiCN in the carbonitride layer of Ti has with 0.5 μ m ~ 5 μ m'sWhen number density distributional pattern that cycle periodically changes along bed thickness direction, owing to there being the number density of particulate TiCNLow region, can bring into play the excellent hardness of column longitudinal growth TiCN crystallization and the characteristic of mar proof well,And owing to there is the high region of number density of particulate TiCN, can bring into play well the toughness raising that particulate TiCN bringsCharacteristic, can in higher level, hold side by side this above-mentioned characteristic. Especially for producing and height with high heatThe high speed heavy cut that load acts on cutting edge adds man-hour, and hard coating layer also possesses the excellent resistance to cutter, resistance to damaged that collapsesProperty, can bring into play excellent mar proof through long-term use.
The present invention completes based on above-mentioned opinion, has following feature.
(1) surface-coated cutting tool, is being made up of tungsten carbide base carbide alloy or base titanium carbonitrideThe surface of tool base hard coating layer is set, wherein,
Described hard coating layer comprises the lower layer and the upper layer that are formed by chemical vapor deposition,
(a) described lower layer, at least comprising the carbonitride layer of one deck Ti and comprising that having 3 ~ 20 μ m amounts toOne deck of average bed thickness or two layers of above Ti compound layer,
(b) described upper layer, for thering is the alumina layer of average bed thickness of 1 ~ 25 μ m,
The carbonitride layer that forms the Ti of at least one deck of the lower layer of described (a) has column longitudinal growth TiCN knotBrilliant tissue is distributed with particulate TiCN in this tissue, and this particulate TiCN is that granular TiCN crystalline phase, nothing are fixedThe phase of mixing of shape TiCN phase or granular TiCN crystalline phase and amorphous TiCN phase, column longitudinal growth TiCNThe averaged particles width W of crystallization is 50 ~ 2000nm, and average aspect ratio A is 5 ~ 50, and described particulate TiCN's is flatAll particle diameter R is 10 ~ 50nm.
(2), according to the surface-coated cutting tool (1) described, wherein, be present in and form described lower layer at leastThe number density in the cross section of the particulate TiCN in the carbonitride layer of the Ti of one deck is 20 ~ 150/μ m2。
(3) according to the surface-coated cutting tool (1) or (2) described, wherein, the cross section of described particulate TiCNNumber density there is the number density distributional pattern periodically changing along bed thickness direction with the cycle of 0.5 μ m ~ 5 μ m.
The present invention is described in detail below.
The Ti compound layer of lower layer:
At least comprise the carbonitride layer of Ti and comprise carbide lamella, nitride layer, carbonitride layer, the carbon oxygen of TiThe lower layer of the one deck in compound layer and carbon nitrogen oxide layer or two layers of above Ti compound layer can be in commonizationLearn under evaporation condition and form, but at least the carbonitride layer of the Ti of one deck by following other method formation. FormThe Ti compound layer of lower layer itself has elevated temperature strength, and the existence of this Ti compound layer not only makes hard coating layer toolStandby elevated temperature strength, and with tool base with comprise Al2O3The upper layer of layer can be closely sealed securely, therefore has and haveHelp improve the effect of the adaptation of hard coating layer to tool base, still, when it amounts to average bed thickness and is less than 3 μ m,Cannot give full play to described effect, on the other hand, exceed 20 μ m if it amounts to average bed thickness, easily produce and collapse cutter,Therefore amounted to average bed thickness and be decided to be 3 ~ 20 μ m.
The carbonitride layer of the Ti of at least one deck in lower layer:
The carbonitride layer of the Ti of at least one deck in lower layer has column longitudinal growth TiCN crystalline structure, at thisIn tissue, be distributed with particulate TiCN. By this formation, toughness is improved, and shows the excellent resistance to cutter that collapses.But, to each crystal grain of column longitudinal growth TiCN crystallization, the particle width of the direction parallel with matrix surface is establishedFor w, when its mean value is made as to averaged particles width W, if averaged particles width W is less than 50nm, can not be trueProtect the mar proof using through long-term, on the other hand, if exceed 2000nm, the resistance to cutter that collapses due to the coarsening of particleProperty, resistance to damaged property reduces. Therefore, the averaged particles width W of column longitudinal growth TiCN crystallization is preferably50 ~ 2000nm. In addition, to each crystal grain of column longitudinal growth TiCN crystallization, by the direction vertical with matrix surfaceParticle length is made as l, described particle width w and the ratio of l is made as to the aspect ratio a of each crystal grain, and then, will be to eachWhen the mean value of the aspect ratio a that crystal grain is obtained is made as average aspect ratio A, if average aspect ratio A is less than 5, can notGuarantee the high abrasion resistance as column longitudinal growth TiCN feature, on the other hand, if exceed 50, toughness on the contraryReduce, resistance toly collapse cutter, resistance to damaged property reduces. Therefore, the average aspect ratio A of column longitudinal growth TiCN crystallization is excellentElect 5 ~ 50 as. At this, in the present invention, when a particle of column longitudinal growth TiCN crystallization is carried out to instrumentation, willThe prescribed direction maximum diameter of the direction parallel with matrix surface is called particle width w, on the other hand, will with matrix surfaceThe prescribed direction tangent line diameter of vertical direction is called particle length l.
Further, for particulate TiCN, the particle diameter of each particulate TiCN is made as to r, its mean value is made as on averageWhen particle diameter R, if average grain diameter R is less than 10nm, can not brings into play and make particulate TiCN disperse the toughness that distributes and bringImprove effect, on the other hand, if exceed 50nm, toughness reduces on the contrary. Therefore, the average grain diameter of particulate TiCNR is preferably 10 ~ 50nm. At this, in the present invention, using as the longest diameter of the precipitated phase of each particulate TiCNMajor diameter is called the particle diameter r of TiCN.
In addition, for particulate TiCN, if the number density in cross section is less than 20/μ m2, can not bring into play and make particulate TiCNDisperse the effect distributing, on the other hand, if exceed 150/μ m2, hinder column longitudinal growth TiCN crystallizationGrowth, mar proof reduces on the contrary. Therefore, the number density in the cross section of particulate TiCN is preferably 20 ~ 150/μ m2。Further, particulate TiCN can equally not distribute, but number density forms with cycle of 0.5 μ m ~ 5 μ m along layerThe number density distributional pattern that thick direction periodically changes, toughness further improves thus.
And, below the carbonitride layer of the Ti after modification described above is called to " modification TiCN layer ".
The Al of upper layer2O3Layer:
The Al of known formation upper layer2O3Layer possesses high temperature hardness and heat resistance, but its average bed thickness is while being less than 1 μ m,Cannot guarantee the mar proof through long-term use, on the other hand, if its average bed thickness exceedes 25 μ m, Al2O3Crystal grainEasily coarsening, its result except reduce high temperature hardness, elevated temperature strength, also reduces high speed heavy cut and adds man-hourResistance to cutter, the resistance to damaged property of collapsing, is therefore decided to be 1 ~ 25 μ m by its average bed thickness.
Disperse the formation of the particulate TiCN distributing:
Particulate TiCN of the present invention can be under common chemical vapor deposition condition enters in the forming process of the lower layer of film formingRow utilizes the chemical vapor deposition method of following condition to form.
By be added to the TDMAT of the core of particulate TiCN in reacting gas, can form the particulate that disperses distributionTICN。
Reacting gas composition (capacity %):
TiCl4：1.7~1.9%
TDMAT：0.01~0.05%
CH3CN：0.7~0.9%
N2：20%
H2: residue
Reaction atmosphere temperature: 800 ~ 950 DEG C
Reaction atmosphere pressure: 5 ~ 12kPa
Fig. 1 is illustrated in the micro-of modification TiCN layer that the lower layer of the present invention that forms under above-mentioned chemical vapor deposition condition containsThe simplified schematic diagram of grain TiCN distributional pattern.
In addition, particulate TiCN is by periodically changing the addition of TDMAT, thus have number density withThe number density distributional pattern that the cycle of 0.5 μ m ~ 5 μ m periodically changes along bed thickness direction and forming. Fig. 2 represents itSimplified schematic diagram.
Carry out more specific description according to Fig. 3.
Fig. 3 represents to take the particulate TiCN of the present invention that forms under above-mentioned chemical vapor deposition condition periodically to changeThe number density distributional pattern of one example of correlation in the lower layer that number density distributes, bed thickness direction position-number densityFigure.
This number density distributional pattern figure can try to achieve by following method.
First, by lower layer be divided into respectively the 0.1 μ m thickness width regions parallel with tool base surface (in Fig. 4,The region that many parallel lines that draw abreast with tool base surface separate is equivalent to 0.1 μ m thickness width regions), rightLength amounts to the number that is present in the particulate TiCN of the each thickness width regions being divided in 10 μ m and measures, and use is sweptRetouch type electron microscope (50000 times of multiplying powers) and measure, try to achieve the number that is present in this 0.1 μ m thickness width regionsDensity (individual/μ m2), the number density of trying to achieve at each thickness width regions, along bed thickness direction pictorialization, is made as Fig. 3 instituteShow the number density distributional pattern figure of such bed thickness direction.
Fig. 5 is the life that represents the column longitudinal growth TiCN crystalline particle in column longitudinal growth TiCN crystalline structure layerThe schematic diagram of long status.
In the present invention, in column longitudinal growth TiCN crystalline structure, be distributed with the structure of particulate TiCN, byIn the existence of particulate TiCN, when column longitudinal growth TiCN crystalline structure is applied to power, column is longitudinal one by oneIn growth TiCN crystallization, produce deviation, therefore produce large toughness. Result can bring into play resistance toly collapse cutter, resistance to damaged property is carriedHigh effect.
Coating tool of the present invention comprises that the lower layer that formed by chemical vapor deposition and upper layer are as hard coating layer, wherein,(a) described lower layer, at least comprising the carbonitride layer of one deck Ti and comprising that having 3 ~ 20 μ m amounts to averageOne deck of bed thickness or two layers of above Ti compound layer, (b) described upper layer, for having the average bed thickness of 1 ~ 25 μ mAlumina layer, the carbonitride layer that forms the Ti of at least one deck of described lower layer has column longitudinal growth TiCNCrystalline structure is distributed with particulate TiCN in this tissue, produce in the high heat with steel or cast iron etc. thus andWhen high load capacity acts on and uses in the high speed heavy cut processing of cutting edge, resistance to cutter, the resistance to damaged property of collapsing is also excellent, resultThrough the long-term excellent mar proof of performance that uses, can realize the long lifetime of coating tool.
Brief description of the drawings
Fig. 1 is the signal that represents the particulate TiCN distributional pattern of the modification TiCN layer that contains of lower layer of the present inventionSketch.
Fig. 2 represents to take modification TiCN contained in the lower layer of the number density distributional pattern periodically changingThe simplified schematic diagram of layer.
Fig. 3 is the number density distributional pattern figure that represents the correlation of the bed thickness direction position-number density in lower layer.
Fig. 4 is the simplified schematic diagram that represents that the method for number density distributional pattern figure to trying to achieve Fig. 3 describes.
Fig. 5 represents column longitudinal growth TiCN crystalline particle in column longitudinal growth TiCN crystalline structureThe schematic diagram of growth conditions.
Detailed description of the invention
Then, illustrate coating tool of the present invention according to embodiment.
[embodiment]
Prepare all to have WC powder, TiC powder, ZrC powder, VC powder, the TaC of 1 ~ 3 μ m average grain diameterPowder, NbC powder, Cr3C2Powder, TiN powder, TaN powder and Co powder, will as material powderThese material powders fit in the mix proportion shown in table 1, and then add wax ball milling in acetone to mix 24 hours,After drying under reduced pressure, the pressed compact taking the pressure punch forming of 98MPa as regulation shape, true by this pressed compact at 5PaVacuum-sintering under the set points of temperature maintenance condition of 1 hour in the air and within the scope of 1370 ~ 1470 DEG C, after sintering,Cutting blade is implemented to the cutting edge reconditioning processing of R:0.07mm, produced respectively thus and there is ISO markThe WC base cemented carbide tool base A ~ E processed of the blade shapes specifying in accurate CNMG160612.
In addition, the TiCN(for preparing all to have 0.5 ~ 2 μ m average grain diameter is TiC/TiN=50/50 by quality ratio)Powder, Mo2C powder, ZrC powder, NbC powder, TaC powder, WC powder, Co powder and Ni powderEnd, as material powder, fits in the mix proportion shown in table 2 by these material powders, mixed by ball mill wet typeClose 24 hours and dry after, taking the pressure punch forming of 98MPa as pressed compact, the nitrogen by this pressed compact at 1.3kPaIn atmosphere and 1540 DEG C of temperature, keep sintering under the condition of 1 hour, after sintering, cutting edge part implemented to R:The cutting edge reconditioning processing of 0.09mm, has formed the blade shapes with iso standard CNMG160612 thusTiCN based ceramic metal tool base a ~ e processed.
Then, utilize common chemical evaporation plating device, at these tool base A～E and tool base a～eSurface, carries out following operation.
(a) forming Ti compound layer with the target bed thickness evaporation shown in the condition shown in table 3 and table 4 and table 6 doesFor the lower layer of hard coating layer.
(b) now, with the k ~ o condition shown in table 4, the carbonitride layer of the Ti that forms Ti compound layer is becomeWhen film, limit periodically changes addition between the maximum of the TDMAT capacity % shown in table 4 and minimum of a valueLimit evaporation forms Ti compound layer.
(c) then, evaporation forms the upper layer that comprises the bed thickness of target shown in table 6 under the conditions shown in Table 3（Al2O3Layer) hard coating layer, manufacture thus coating tool 1 ~ 15 of the present invention.
Utilize scanning electron microscope (multiplying power is 50000 times) under described coating tool 1 ~ 10 of the present inventionThe modification TiCN layer of at least one deck in portion's layer carries out the observation of many visual fields, results verification the film shown in Fig. 1 formThere is the membrane structure of particulate TiCN in the grain circle of the column crystallization that schematic diagram represents and intragranular.
In addition, utilize scanning electron microscope (multiplying power is 50000 times) to described coating tool 11 ~ 15 of the present inventionLower layer in the modification TiCN layer of at least one deck carry out the observation of many visual fields, results verification the film shown in Fig. 2There is the membrane structure of particulate TiCN in the grain circle of the column crystallization that formation schematic diagram represents and intragranular.
Further, utilize transmission electron microscope (multiplying power is 200000 times) to the coated work of described the present inventionThe modification TiCN layer of at least one deck in the lower layer of tool 1 ~ 15 carries out the observation of many visual fields, and to particulate TiCNCarry out electron beam diffraction results verification above-mentioned particulate TiCN be granular TICN crystalline phase, amorphous TiCNThe phase of mixing of phase or granular TiCN crystalline phase and amorphous TICN phase.
In addition, object as a comparison, with coating tool 1 ~ 15 of the present invention in the same manner with shown in table 3 and table 5Condition and form and do at the surperficial evaporation of tool base A ~ E and tool base a ~ e with the target bed thickness shown in table 7For the Ti compound layer of the lower layer of hard coating layer. Now, at the carbon that forms the Ti that forms Ti compound layerWhen nitride layer, do not add TDMAT and form column longitudinal growth TiCN crystalline structure.
Then, form and comprise Al with the condition shown in table 3 and with the target bed thickness evaporation shown in table 72O3Layer upperPortion's layer, as the upper layer of hard coating layer, has been made the comparison coating tool 1 ~ 15 of table 7 thus.
In addition, utilize scanning electron microscope (5000 times of multiplying powers) to measure coating tool 1 ~ 15 of the present inventionAnd the bed thickness of each constituting layer of comparison coating tool 1 ~ 15, measure the bed thickness of five points in observation visual field and also make evenThe result of all obtaining average bed thickness has all demonstrated in fact identical with the target bed thickness shown in table 6 and table 7Average bed thickness.
In addition,, for coating tool 1 ~ 15 of the present invention and comparison coating tool 1 ~ 15, use equally scanning electronMicroscope (5000 times of multiplying powers), amounts to 10 μ m scopes to be present in length in the horizontal direction of tool baseInterior column longitudinal growth TiCN crystallization, the column of the carbonitride layer of the Ti that mensuration formation lower layer comprisesThe maximum particle width w of longitudinal growth TiCN crystallization and the particle length l of film thickness direction, by maximum particle widthAnd the ratio of the particle length of film thickness direction is tried to achieve aspect ratio and is obtained as the particle width w's that each crystal grain is obtainedThe averaged particles width W of mean value and as the average aspect ratio A of the mean value of aspect ratio a, this aspect ratio aBe defined as the ratio with particle length l as the particle width w that each crystal grain is obtained.
In addition,, for coating tool 1 ~ 10 of the present invention, use equally scanning electron microscope (multiplying power 50000Doubly), with the vertical direction of tool base on be in the thickness of TiCN thickness part and with the level of tool baseIt in direction, is the particulate in length amounts to 10 μ m, lower layer being existed in the carbonitride layer of included TiThe number of TiCN is measured, and tries to achieve the number density (individual/μ m in cross section2）。
In addition,, for coating tool 11 ~ 15 of the present invention, use equally scanning electron microscope (multiplying power 50000Doubly), the carbonitride layer of the Ti that lower layer is comprised is divided into respectively the 0.1 μ m parallel with tool base surfaceThickness width regions, amounts to the granular TiCN that is present in the each thickness width regions being divided in 10 μ m to lengthNumber measure, the number density in cross section of trying to achieve the particulate TiCN that is present in this 0.1 μ m thickness width regions is (individual/μm2）。
[table 1]
[table 2]
[table 3]
[table 4]
* in k～o, make TDMAT addition periodically change
[table 5]
[table 6]
In (note 1) 11-15, the cross section number density of the particulate TiCN of 1-TiCN alternately takes the minimizing while of maximum value periodically to change in bed thickness direction, therefore represents maximum and minimum mean value separately.
* label table in (note 2) hurdle is shown in outside the scope of claim 2, and * * label table is shown in outside the scope of claim 3
[table 7]
Then, about described coating tool 1 ~ 15 of the present invention and comparison coating tool 1 ~ 15, at the bar shown in table 8Under part, implement machining test, in all cutting tests, all measured the wear of the tool flank width of cutting edge.
Table 9 represents its measurement result.
[table 8]
(note) is cut material is all round bar
[table 9]
(relatively the cutting test result on coating tool hurdle represents owing to collapsing cutter, the reason such as damaged reaches cutting time till the life-span (minute))
From the result shown in table 6 and table 9, coating tool of the present invention, the bottom of formation hard coating layerThe carbonitride layer of the Ti of layer has column longitudinal growth TiCN crystalline structure, in this tissue, is dispersed with respectivelyParticulate TiCN, even thus at hot generation such as the height with steel or cast iron etc. and intermittence or impact high load capacity workWhile use for the high speed heavy cut processing of cutting edge, resistance to cutter, the resistance to damaged property of collapsing is also excellent, and result is through lengthPhase is used the excellent mar proof of performance.
On the other hand, do not disperse to distribute for the carbonitride layer of Ti of the lower layer forming hard coating layerThere is the comparison coating tool 1 ~ 15 of particulate TiCN, known high with the hot generation of height and intermittence or impactWhen load acts on and uses in the high speed heavy cut processing of cutting edge, owing to collapsing cutter, damaged etc. generationIn short time, reach service life
[utilizability in industry]
As mentioned above, coating tool of the present invention for example produces and intermittence in the high heat with steel or cast iron etc.Or impact high load capacity acts in the high speed heavy cut processing of cutting edge, resistance to the collapsing cutter, resistance to lacking that performance is excellentDamage property, can increase the service life, and can not only under high speed interrupted cut processing conditions, use, certainly also can beThe high speed heavy cut processing conditions of high-speed cutting processing conditions, high cutting depth, high feed speed etc. are lower to be used.
Claims (3)
1. a surface-coated cutting tool, what be made up of tungsten carbide base carbide alloy or base titanium carbonitrideThe surface of tool base is provided with hard coating layer, it is characterized in that,
Described hard coating layer comprises the lower layer and the upper layer that are formed by chemical vapor deposition,
(a) described lower layer, at least comprising the carbonitride layer of one deck Ti and comprising that having 3 ~ 20 μ m amounts toOne deck of average bed thickness or two layers of above Ti compound layer,
(b) described upper layer, for thering is the alumina layer of average bed thickness of 1 ~ 25 μ m,
The carbonitride layer that forms the Ti of at least one deck of described (a) lower layer has column longitudinal growth TiCN crystallizationTissue is distributed with particulate TiCN in this tissue, and this particulate TiCN is granular TiCN crystalline phase, amorphousThe phase of mixing of TiCN phase or granular TiCN crystalline phase and amorphous TiCN phase, column longitudinal growth TiCN knotBrilliant averaged particles width W is 50 ~ 2000nm, and average aspect ratio A is 5 ~ 50, and described particulate TiCN's is averageParticle diameter R is 10 ~ 50nm.
2. surface-coated cutting tool according to claim 1, is characterized in that, is forming described lower layerThe number density in the cross section of the particulate TiCN at least existing in the carbonitride layer of the Ti of one deck is 20 ~ 150/μ m2。
3. surface-coated cutting tool according to claim 1 and 2, is characterized in that, described particulate TiCNThe number density in cross section there is the number density periodically changing along bed thickness direction with the cycle of 0.5 μ m ~ 5 μ m and distributeForm.
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| Application Number | Priority Date | Filing Date | Title |
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| JP2011-144908 | 2011-06-29 | ||
| JP2011144908 | 2011-06-29 | ||
| JP2011-204229 | 2011-09-20 | ||
| JP2011204229 | 2011-09-20 | ||
| JP2012141506A JP5928806B2 (en) | 2011-06-29 | 2012-06-22 | Surface coated cutting tool with excellent chipping resistance due to hard coating layer |
| JP2012-141506 | 2012-06-22 |
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| CN102847962A CN102847962A (en) | 2013-01-02 |
| CN102847962B true CN102847962B (en) | 2016-05-04 |
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| CN1721107A (en) * | 2004-07-05 | 2006-01-18 | 山特维克知识产权公司 | Cutting tool insert |
| JP2006346777A (en) * | 2005-06-14 | 2006-12-28 | Mitsubishi Materials Corp | Surface coated cemented carbide cutting tool having lubricative coating layer exhibiting excellent wear resistance |
| CN101305112A (en) * | 2005-10-15 | 2008-11-12 | 钴碳化钨硬质合金维迪亚产品有限公司及两合公司 | Method for producing a coated substrate body, substrate body comprising a coating and use of the coated substrate body |
| JP2009184046A (en) * | 2008-02-05 | 2009-08-20 | Mitsubishi Materials Corp | Surface coated cutting tool having hard coating layer exhibiting excellent chipping resistance in high-speed heavy cutting |
| JP2010284760A (en) * | 2009-06-12 | 2010-12-24 | Mitsubishi Materials Corp | Surface-coated cutting tool with hard coating layer exerting excellent chipping resistance in high-speed intermittent heavy cutting |
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