CN101318394A - Novel TiA1N composite multiple coating applied for cutting tool - Google Patents
Novel TiA1N composite multiple coating applied for cutting tool Download PDFInfo
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Abstract
The invention discloses a novel TiAlN compound multi-coating applied on a cutting tool, which sequentially includes a Ti coating which is coated on the surface layer of a hard alloy substrate by adopting a PVD method, a plurality of TiN/TiAlN compound coatings and TiAlN coatings which are alternatively formed outside the Ti coating by adopting the PVD method, another Ti coating coated on the TiAlN coating as well as an a TiAlN coating coated on the Ti coating and taken as the surface layer from the hard alloy substrate to the outside; the compound multi-coating is characterized by high surface rigidness, good toughness, good wearing resistance, stable chemical property, heat resistance and oxidation resistance, tiny surface and tinier and less 'drops', small friction factor, low heat conductive rate, etc. The compound multi-coating can exert excellent properties when cutting the materials that are hard to be processed such as ultra-high hard materials at high speed in particular.
Description
Technical field
The present invention relates to the coating of cutting element, particularly relate to a kind of Novel TiA 1 N composite multiple coating that is applied to cutting element.
Background technology
It is one of important channel of improving the cutting element performance that the cutting element coating is handled, coated cutting tool has that case hardness height, wearability are good, stable chemical performance, heat-resistant oxidized, characteristic such as the friction factor is little and pyroconductivity is low, comparable not coated cutting tool improves the life-span more than 3 ~ 5 times during cutting, improve cutting speed 20% ~ 70%, improve 0.5 ~ 1 grade of machining accuracy, reduce cutting element consumption costs 20% ~ 50%.The high-quality process for modifying surface that the face coat technology of cutting element grows up as the market demand, because this technology can make cutting element obtain good comprehensive mechanical performance, not only can improve cutting element service life effectively, and can also improve machining efficient significantly, so this technology is with material, processing technology and be called the three big key technologies that cutting element is made.
The cutting element coating of prior art mainly contains three kinds.A kind of is conventional Ti AlN coating, conventional Ti AlN coating technology is deposition one deck TiAlN coating on hard alloy substrate, the cutting element of conventional Ti AlN coating is when cutting superelevation hard material, be subjected to the impact of cutting force, the fragility serious wear that produces, do cutting by the MikronUCP600 lathe and analyze its abrasion condition and judging service life: 4 sword tack coating slotting cutter Φ 6 * 50 are 4250RPM at rotating speed, feeding is 620mm/min, cutting-in is 6mm, cut under the wide situation and cut SKD11 (63HRC) for 0.12mm and air cooling, when wear extent is 0.1mm, only cut 8m, as shown in Figure 1, Fig. 1 is the schematic diagram that concerns of the length of cut of coated cutting tool and abrasion condition, abrasion condition is when the Keyence VHX digital micro-analysis sem observation that amplifies 175 times, abrasion condition is very crude, by analysis: in working angles, because of hard film layer toughness too poor, compactness is poor, thereby when machining superelevation hard material, being subjected to cutting force impacts down, hard film layer clashes into a lot of small pieces and comes off, thereby after machining the time, make cutting force too concentrated, thereby increased the overall wear of rete, influenced the life-span of coating.Another kind is traditional laminated coating, the tradition laminated coating adopts TiN and TiAlN laminated coating method, adopt TiAlN in the outermost functional layer material, the thickness of this layer is up to 1.2～1.5 μ m, analyze on the whole, the toughness of the formed hard film layer of this coating process is better than traditional TiAlN rete, but but the TiAlN than traditional is not hard for its hardness, when cutting superelevation hard material, not shock-resistant, thus make the fragility serious wear, cause rate of depreciation height on the whole, through experiment confirm repeatedly: adopt identical hard alloy cutter knife-edge, identical cutting parameter, identical cutting material is when being cut to 14m, wear extent is 0.1mm, as shown in Figure 1, and in the whole process of cutting, the fragility serious wear, thus friction wear rate height caused.Another is the conventional composite coating, the method that the conventional composite coating adopts TiN and TiAlN to evaporate simultaneously, the composite ganoine thin film of coating one deck TiN and TiAlN on solid carbide.Through repeatedly experimental analysis: adopt identical hard alloy cutter knife-edge, identical cutting parameter, identical cutting material when being cut to 22m, wear extent is 0.1mm, as shown in Figure 1, in the whole process of cutting, be subjected to the cutting force impact and cause the phenomenon of fragility wearing and tearing to be resolved, toughness is greatly improved; But the microhardness deficiency of this rete, when cutting superelevation hard material, friction wear is fast, makes the working durability low.
Summary of the invention
The objective of the invention is to overcome the deficiency of prior art, a kind of Novel TiA 1 N composite multiple coating that is applied to cutting element is provided, have that case hardness height, good toughness, wearability are good, stable chemical performance, heat-resistant oxidized, surface small " drop " is littler and less, characteristic such as coefficient of friction is little and pyroconductivity is low, particularly wait in the difficult-to-machine material firmly and can give play to outstanding performance in the high-speed cutting superelevation.
The technical solution adopted for the present invention to solve the technical problems is: a kind of Novel TiA 1 N composite multiple coating that is applied to cutting element is outwards comprised successively by hard alloy substrate:
One adopts the PVD method to be coated in a Ti coating on hard alloy substrate top layer;
One adopts the PVD method to be coated in the TiN/TiAlN composite coating of a Ti coating surface;
One adopts the PVD method to be coated in a TiAlN coating on TiN/TiAlN composite coating surface;
One adopts the PVD method to be coated in the 2nd Ti coating of a TiAlN coating surface;
One adopts the PVD method to be coated in the 2nd TiAlN coating of the 2nd Ti coating surface, and wherein, the 2nd TiAlN coating is an outermost layer.
A kind of Novel TiA 1 N composite multiple coating that is applied to cutting element comprises:
One adopts the PVD method to be formed on the interior Ti coating on hard alloy substrate top layer;
One adopts the PVD method to be formed on the outermost outer TiAlN coating of all coatings;
One employing PVD method is formed on the outer Ti coating within the described outer TiAlN coating, and described outer TiAlN coating is coated in outer Ti coating surface;
TiN/TiAlN composite coating and TiAlN coating in some employing PVD methods alternately are formed between Ti coating and the outer Ti coating, wherein, Ti coating surface in TiN/TiAlN composite coating is coated in, described outer Ti coating is coated in the TiAlN coating surface of outermost.
Preferably 17 layers of total numbers of plies of described composite multiple coating comprise:
One deck adopts the PVD method to be formed on the interior Ti coating on hard alloy substrate top layer;
One deck adopts the PVD method to be formed on the outermost outer TiAlN coating of all coatings;
One deck employing PVD method is formed on the outer Ti coating within the described outer TiAlN coating, and described outer TiAlN coating is coated in outer Ti coating surface;
TiN/TiAlN composite coating and TiAlN coating in 14 layers of employing PVD method alternately are formed between Ti coating and the outer Ti coating, wherein, Ti coating surface in TiN/TiAlN composite coating is coated in, described outer Ti coating is coated in the TiAlN coating surface of outermost.
A kind of preparation method that is applied to the Novel TiA 1 N composite multiple coating of cutting element comprises the steps:
A. the coating pre-treatment of cutting element: adopt sand-blast to cutting element polish, passivation, its blunt radius of circle is 0.01～0.07mm;
B. the coating of cutting element is handled: it comprises the following steps:
B 1. adopts the PVD method to be coated with the pure Ti coating of last layer on the hard alloy substrate top layer;
B2. the outer surface in pure Ti coating adopts the PVD method to be coated with last layer TiN/TiAlN composite coating;
B3. the outer surface at the TiN/TiAlN composite coating adopts the PVD method to be coated with last layer TiAlN coating;
B4. the outer surface in the TiAlN coating adopts the PVD method to be coated with last layer TiN/TiAlN composite coating again;
B5. the outer surface at the TiN/TiAlN composite coating adopts the PVD method to be coated with last layer TiAlN coating again; When the number of plies reaches requiring of setting, go to next step, otherwise, repeating step b4;
B6. the outer surface in the TiAlN coating adopts the PVD method to be coated with last layer Ti coating;
B7. the outer surface in the Ti coating adopts the PVD method to coat a TiAlN coating as the top layer;
C. the coating post processing of cutting element: adopt the little sand blasted surface polishing of wet type method that the coating surface of cutting element is handled.
During the coating of described cutting element was handled, preferably 17 layers of total numbers of plies of its coating comprised:
One deck adopts the PVD method to be formed on the Ti coating on hard alloy substrate top layer;
One deck adopts the PVD method to be formed on the outermost TiAlN coating of all coatings;
One deck employing PVD method is formed on the Ti coating within the described outermost TiAlN coating, and described outermost TiAlN coating is coated in the Ti coating surface;
14 layers are adopted the PVD method alternately to be formed on TiN/TiAlN composite coating and TiAlN coating between the inside and outside Ti coating, wherein, Ti coating surface in the TiN/TiAlN composite coating in is coated in, described outer Ti coating is coated in the TiAlN coating surface of outermost.
The invention has the beneficial effects as follows, owing to adopted on the cutting element of hard alloy substrate and be provided with composite multiple coating, this kind coating accompanies the superelevation hard membrane layer in the centre, on film surface, load the multiple coating method of the littler and few lubricating layer of one deck coefficient of friction littler, small " drop ", formed PVD coating is when cutting superelevation hard material, and the performance that is shown is more outstanding than composite coating, laminated coating.From repeatedly this type coating being carried out the cutting experiment analysis: referring to shown in Figure 1, use identical knife-edge, cut SKD11 (63HRC) material with identical cutting parameter, when wearing and tearing were 0.1mm, length of cut was 26m.By cutting experiment is analyzed: the composite interlayer of this kind coating solves the problem of poor toughness, its hardness is not as good as the TiAlN rete, but, compound by TiN and TiAlN, the Al content of composite bed promotes in the middle of making, add man-hour in air cooling, DRY CUTTING, heat in metal cutting makes Al and the airborne oxygen in the composite bed produce chemical reaction formation α-Al
2O
3The inertia heat-barrier coating; but because of the Al atom number content of this layer only accounts for 38%～40% in the metallic element; so little to the influence of the toughness in this intermediate layer, and this layer further promoted in the microhardness with the cutting material contact-making surface, makes more shock resistance and wear-resisting of cutting ability.And at the middle hard TiAlN intermediate function layer of superelevation that is coated with of composite bed; the microhardness height of this layer; and Al atom number content accounts for 66.7% of metallic element; under the protection of the high composite coating of toughness; make this layer under the impact of cutting force, not produce the fragility wearing and tearing; and because of the extreme hardness of this layer, when cutting superelevation hard material, more wear-resisting.And loaded the littler lubricating layer of one deck coefficient of friction at film surface, made this coating in working angles, the low and anti-stick cutter of friction wear rate, thus reach the cutting ability that has improved cutter.A kind of Novel TiA 1 N composite multiple coating that is applied to cutting element of the present invention has that case hardness height, good toughness, wearability are good, stable chemical performance, heat-resistant oxidized, surface small " drop " is littler and less, characteristic such as coefficient of friction is little and pyroconductivity is low, particularly wait in the difficult-to-machine material firmly and can give play to outstanding performance in the high-speed cutting superelevation.
Description of drawings
Below in conjunction with drawings and Examples the present invention is described in further detail; But a kind of Novel TiA 1 N composite multiple coating that is applied to cutting element of the present invention is not limited to embodiment.
Fig. 1 is the schematic diagram that concerns of the length of cut of four kinds of different coating cutting elements and abrasion condition;
Fig. 2 is embodiment one organigram of the present invention;
Fig. 3 is embodiment two organigrams of the present invention.
The specific embodiment
Embodiment one, and referring to shown in Figure 2, a kind of Novel TiA 1 N composite multiple coating that is applied to cutting element of the present invention comprises:
One adopts the PVD method to be formed on the interior Ti coating 21 on hard alloy substrate 10 top layers, and hard alloy substrate 10 adopts WC-Co;
One adopts the PVD method to be formed on the outermost outer TiAlN coating 11 of all coatings;
One employing PVD method is formed on the outer Ti coating 22 within the described outer TiAlN coating 11, and described outer TiAlN coating 11 is coated in outer Ti coating 22 surfaces;
TiN/TiAlN composite coating 31 and TiAlN coating 32 in some employing PVD methods alternately are formed between Ti coating 21 and the outer Ti coating 22, wherein, Ti coating 21 surfaces in TiN/TiAlN composite coating 31 is coated in, described outer Ti coating 22 is coated in TiAlN coating 32 surfaces of outermost.
In the present embodiment, total number of plies of composite multiple coating is 17 layers, comprising:
One deck adopts the PVD method to be formed on the interior Ti coating 21 on hard alloy substrate 10 top layers;
One deck adopts the PVD method to be formed on the outermost outer TiAlN coating 11 of all coatings;
One deck employing PVD method is formed on the outer Ti coating 22 within the described outer TiAlN coating 11, and described outer TiAlN coating 11 is coated in outer Ti coating 22 surfaces;
TiN/TiAlN composite coating 31 and TiAlN coating 32 in 14 layers of employing PVD method alternately are formed between Ti coating 21 and the outer Ti coating 22, wherein, Ti coating 21 surfaces in TiN/TiAlN composite coating 31 is coated in, described outer Ti coating 22 is coated in TiAlN coating 32 surfaces of outermost.
The present invention has adopted the PVD technology, and the PVD technology comes across later 1970s, because its PROCESS FOR TREATMENT Controllable Temperature built in below 500 ℃, therefore can be used as the coating that final treatment process is used for high-speed steel class cutter.PVD is a kind of gas phase deposition technology, and PVD is the abbreviation of Physical Vapor Deposition.PVD superficial film treatment process principle is: Ar gas is converted into Ar+ under the electric field action, and Ar+ bombards N
2Form the N atom, the Ti metallic matrix that is bombarded simultaneously sputters the Ti metallic atom and N forms the TiN compound, and TiN splashes to piece surface to be deposited and forms special depositional coating under electric field action, reach the purpose of film forming gradually.
Below, in conjunction with Fig. 1, Fig. 2 a kind of preparation method that is applied to the Novel TiA 1 N composite multiple coating of cutting element of the present invention being described, it comprises the coating pre-treatment of cutting element, the coating processing of cutting element and the coating post processing of cutting element.
The coating pre-treatment of step a. cutting element: be adopt sand-blast to cutting element polish, passivation.Cutting element is polished, can remove cutting tool surface burr and smooth emery wheel vestige, remove the cutter residual stress and improve tool surface fineness, improve coating and high base strength, improve film adhesion; The cutting element cutting edge is carried out Passivation Treatment, and making blunt radius of circle is 0.01～0.07mm, guarantees the intensity of cutting edge, prevents to produce in machining superhard material process the tipping phenomenon.
Cemented carbide cutting tool surface before the coating is because of emery wheel abrasive dust vestige, burr, cleaning with ultrasonic wave is to be difficult to remove, directly have influence on the surface roughness of coated cutting tool, coefficient of friction strengthens, thereby make cutting tool mechanical wear rate in working angles big, and the PVD ganoine thin film is coated in this vestige, on the burr, will make ganoine thin film built on stilts, phenomenons such as hole are arranged between rete and the matrix, thereby cutting superhard the grade in the difficult-to-machine material process, make cutting force too concentrated, rete is little to be peeled off thereby make, and accelerates the fragility wearing and tearing of rete, therefore, cutting tool carries out passivation before coating, surface finish is handled, can remove the loose burr in cutting tool surface, and the concavo-convex emery wheel vestige on cutting tool surface is seamlessly transitted, hard film layer and matrix adhesive force are improved and effectively prevent tipping.
By observation to cutting tool, the cutter sword surface irregularity that the emery wheel abrasive dust is crossed, emery wheel trace slit are many and assorted, surperficial burr is many, and the cutting edge corrugated is serious, such matrix is coated ganoine thin film, in working angles, make cutting force concentrate, thereby wear extent is increased, application life is reduced.And even through the sand-blast surface treated, cutting edge is smooth and suitable blunt circle is arranged, and in the process of cutting superelevation hard material, is difficult for producing tipping, stripping phenomenon.The experiment proved that: two identical knife-edge 4 sword ball end mills (wherein unpassivated, polishing before the coating, before another coating passivation 60s, polishing 30s).Carry out the TiAlN coating at same heat, adopt identical stock-removing machine, identical cutting parameter cutting SKD11 (63HRC), show from experimental data: whole working angles, cutter tool abrasion than untreated on cutting ability of crossing through Passivation Treatment before the coating is little, when being cut to 20m, the tool abrasion of pre-treatment lacks 0.023 than the cutter of not pre-treatment, this be because, cutter is after passivation, polishing before the coating, built on stilts phenomenon is effectively solved between ganoine thin film and the matrix, has improved the compactness of transition zone; Removed the matrix burr simultaneously; Smooth matrix surface; Make in working angles, reduced friction wear rate and fragility wearing and tearing because of the hard film layer distortion being caused in the cutting force impact, thus the processing life-span of having improved solid carbide.
The coating of step b. cutting element is handled: it comprises the following steps:
Step b1. adopts the PVD method to be coated with the pure Ti coating 21 of last layer on hard alloy substrate 10 top layers;
Step b2. adopts the PVD method to be coated with last layer TiN/TiAlN composite coating 31 at the outer surface of pure Ti coating 21;
Step b3. adopts the PVD method to be coated with last layer TiAlN coating 32 at the outer surface of TiN/TiAlN composite coating 31;
Step b4. adopts the PVD method to be coated with last layer TiN/TiAlN composite coating 31 again at the outer surface of TiAlN coating 32;
Step b5. adopts the PVD method to be coated with last layer TiAlN coating 32 at the outer surface of TiN/TiAlN composite coating 31 again; Total number of plies of its coating of present embodiment is 17 layers, therefore, the TiN/TiAlN composite coating 31 and the TiAlN coating 32 that alternately are formed between the inside and outside Ti coating 21,22 have 14 layers, be that TiN/TiAlN composite coating 31 adopts 7 layers, TiAlN coating 32 adopts 7 layers, because TiN/TiAlN composite coating 31 is coated with earlier, therefore, outermost one deck is a TiAlN coating 32 in 14 layers;
Step b6. adopts the PVD method to be coated with last layer Ti coating 22 at the outer surface of TiAlN coating 32 (i.e. the TiAlN coating 32 of outermost one deck in 14 layers);
Step b7. adopts the PVD method to be coated with last layer TiAlN coating 11 at the outer surface of Ti coating;
Above-mentioned composite multiple coating is by the PVD method, adopt uninterrupted composite coating mode, accompany one deck superhard thin film between two composite beds, this superabrasive layer is higher than traditional TiAlN coating hardness, when the machining superhard material, this superabrasive layer can be because of the brittle damage that is hit.Be coated with the pure Ti coating 21 of last layer in advance on matrix 10 top layers, can improve the adhesive force on ganoine thin film and matrix 10 surfaces, this layer thickness must be moderate, can be chosen between 50～80nm, avoid in cutting superhard material process, because of the excessive or too small constraint that causes ganoine thin film to break away from active force between atom of toughness is peeled off.Intermediate layer 31,32 is being carried out in the gradient composite coating process, control the alternately variation of N constituent content gradient when of ganoine thin film Ti/Al content, reaching the toughness and the hardness of reasonable distribution ganoine thin film, more effectively decomposing cutting force; TiN/TiAlN composite coating 31, improve TiAl target evaporation electric current and reduce Ti target evaporation rate in coating procedure as anti-impacting layer, and the Al content of this layer is suitably improved, and in high speed and dry cutting superelevation hard material process, will form finer and close α-Al
2O
3The inertia heat-barrier coating has not only improved cutting hardness, but also stops the hard thin layer further oxidized, and this layer should not be thin excessively, can be controlled between 1.2～1.5um.Superhard TiAlN coating 11 is adopted on the top layer, can reduce the formation of small " drop " of PVD coating, reduces the cutting tool surface roughness, and the generation of reduce friction wearing and tearing and frictional heat has solved sticking cutter problem, and this layer generally is controlled between 80～100nm.
The coating post processing of step c cutting element: adopt the little sand blasted surface polishing of wet type method that the coating surface of cutting element is handled, grind off cutting tool surface small " drop ", the cutting tool surface roughness is diminished; Remove surface compress residual stresses simultaneously, avoid cutting during superhard material pressure concentrate and rete peeled off, improve the surface smoothness of cutter life and work piece.
The hard film layer surface of adopting the PVD coating process to apply can produce small " drop ", these small " drops " cause tool surface coarse, cutter is in working angles, make the wear rate height of rete greatly because of coefficient of friction, and the fineness of work piece surface when initial machining is poor, not only can have influence on the life-span of cutter, but also will have influence on the quality of machined surface, and through the coating surface of cutting element being carried out after the little sand blasted surface polishing of wet type method handles, can grind off ganoine thin film lip-deep small " drop " particle, the tool surface roughness is reduced, and the machined surface surface quality is also improved accordingly.
Embodiment two, and referring to shown in Figure 3, a kind of Novel TiA 1 N composite multiple coating that is applied to cutting element of the present invention is outwards comprised successively by hard alloy substrate 10:
One adopts the PVD method to be coated in a Ti coating 21 on hard alloy substrate 10 top layers;
One adopts the PVD method to be coated in the TiN/TiAlN composite coating 31 on a Ti coating 21 surfaces;
One adopts the PVD method to be coated in a TiAlN coating 32 on TiN/TiAlN composite coating 31 surfaces;
One adopts the PVD method to be coated in the 2nd Ti coating 22 on a TiAlN coating 32 surfaces;
One adopts the PVD method to be coated in the 2nd TiAlN coating 11 on the 2nd Ti coating 22 surfaces, and wherein, the 2nd TiAlN coating 11 is an outermost layer.
Be that with the difference of embodiment one a TiN/TiAlN composite coating 31 and a TiAlN coating 32 respectively adopt one deck, rather than the multilayer that replaces.
The foregoing description only is used for further specifying a kind of Novel TiA 1 N composite multiple coating that is applied to cutting element of the present invention; but the present invention is not limited to embodiment; every foundation technical spirit of the present invention all falls in the protection domain of technical solution of the present invention any simple modification, equivalent variations and modification that above embodiment did.
Claims (5)
1. Novel TiA 1 N composite multiple coating that is applied to cutting element is characterized in that: outwards comprised successively by hard alloy substrate:
One adopts the PVD method to be coated in a Ti coating on hard alloy substrate top layer;
One adopts the PVD method to be coated in the TiN/TiAlN composite coating of a Ti coating surface;
One adopts the PVD method to be coated in a TiAlN coating on TiN/TiAlN composite coating surface;
One adopts the PVD method to be coated in the 2nd Ti coating of a TiAlN coating surface;
One adopts the PVD method to be coated in the 2nd TiAlN coating of the 2nd Ti coating surface, and wherein, the 2nd TiAlN coating is an outermost layer.
2. Novel TiA 1 N composite multiple coating that is applied to cutting element is characterized in that: comprising:
One adopts the PVD method to be formed on the interior Ti coating on hard alloy substrate top layer;
One adopts the PVD method to be formed on the outermost outer TiAlN coating of all coatings;
One employing PVD method is formed on the outer Ti coating within the described outer TiAlN coating, and described outer TiAlN coating is coated in outer Ti coating surface;
TiN/TiAlN composite coating and TiAlN coating in some employing PVD methods alternately are formed between Ti coating and the outer Ti coating, wherein, Ti coating surface in TiN/TiAlN composite coating is coated in, described outer Ti coating is coated in the TiAlN coating surface of outermost.
3. a kind of Novel TiA 1 N composite multiple coating that is applied to cutting element according to claim 2 is characterized in that: preferably 17 layers of total numbers of plies of described composite multiple coating comprise:
One deck adopts the PVD method to be formed on the interior Ti coating on hard alloy substrate top layer;
One deck adopts the PVD method to be formed on the outermost outer TiAlN coating of all coatings;
One deck employing PVD method is formed on the outer Ti coating within the described outer TiAlN coating, and described outer TiAlN coating is coated in outer Ti coating surface;
TiN/TiAlN composite coating and TiAlN coating in 14 layers of employing PVD method alternately are formed between Ti coating and the outer Ti coating, wherein, Ti coating surface in TiN/TiAlN composite coating is coated in, described outer Ti coating is coated in the TiAlN coating surface of outermost.
4. a preparation method that is applied to the Novel TiA 1 N composite multiple coating of cutting element comprises the steps:
A. the coating pre-treatment of cutting element: adopt sand-blast to cutting element polish, passivation, its blunt radius of circle is 0.01～0.07mm;
B. the coating of cutting element is handled: it comprises the following steps:
B1. adopt the PVD method to be coated with the pure Ti coating of last layer on the hard alloy substrate top layer;
B2. the outer surface in pure Ti coating adopts the PVD method to be coated with last layer TiN/TiAlN composite coating;
B3. the outer surface at the TiN/TiAlN composite coating adopts the PVD method to be coated with last layer TiAlN coating;
B4. the outer surface in the TiAlN coating adopts the PVD method to be coated with last layer TiN/TiAlN composite coating again;
B5. the outer surface at the TiN/TiAlN composite coating adopts the PVD method to be coated with last layer TiAlN coating again; When the number of plies reaches requiring of setting, go to next step, otherwise, repeating step b4;
B6. the outer surface in the TiAlN coating adopts the PVD method to be coated with last layer Ti coating;
B7. the outer surface in the Ti coating adopts the PVD method to coat a TiAlN coating as the top layer;
C. the coating post processing of cutting element: adopt the little sand blasted surface polishing of wet type method that the coating surface of cutting element is handled.
5. a kind of Novel TiA 1 N composite multiple coating that is applied to cutting element according to claim 4 is characterized in that: during the coating of described cutting element was handled, preferably 17 layers of total numbers of plies of its coating comprised:
One deck adopts the PVD method to be formed on the Ti coating on hard alloy substrate top layer;
One deck adopts the PVD method to be formed on the outermost TiAlN coating of all coatings;
One deck employing PVD method is formed on the Ti coating within the described outermost TiAlN coating, and described outermost TiAlN coating is coated in the Ti coating surface;
14 layers are adopted the PVD method alternately to be formed on TiN/TiAlN composite coating and TiAlN coating between the inside and outside Ti coating, wherein, Ti coating surface in the TiN/TiAlN composite coating in is coated in, described outer Ti coating is coated in the TiAlN coating surface of outermost.
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