CN109482916B - Coating and post-treated indexable insert and manufacturing method thereof - Google Patents

Coating and post-treated indexable insert and manufacturing method thereof Download PDF

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CN109482916B
CN109482916B CN201811269415.3A CN201811269415A CN109482916B CN 109482916 B CN109482916 B CN 109482916B CN 201811269415 A CN201811269415 A CN 201811269415A CN 109482916 B CN109482916 B CN 109482916B
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coating
titanium
nitride
substrate
cvd
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CN109482916A (en
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陈培强
李凌祥
邹建平
姜涛
吴其山
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Xiamen Golden Egret Special Alloy Co Ltd
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Xiamen Golden Egret Special Alloy Co Ltd
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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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
    • B23P15/00—Making specific metal objects by operations not covered by a single other subclass or a group in this subclass
    • B23P15/28—Making specific metal objects by operations not covered by a single other subclass or a group in this subclass cutting tools
    • 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
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C28/00—Coating for obtaining at least two superposed coatings either by methods not provided for in a single one of groups C23C2/00 - C23C26/00 or by combinations of methods provided for in subclasses C23C and C25C or C25D
    • C23C28/04—Coating for obtaining at least two superposed coatings either by methods not provided for in a single one of groups C23C2/00 - C23C26/00 or by combinations of methods provided for in subclasses C23C and C25C or C25D only coatings of inorganic non-metallic material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23B—TURNING; BORING
    • B23B2224/00—Materials of tools or workpieces composed of a compound including a metal
    • B23B2224/04—Aluminium oxide
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23B—TURNING; BORING
    • B23B2224/00—Materials of tools or workpieces composed of a compound including a metal
    • B23B2224/36—Titanium nitride
    • 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
    • B23B2226/18—Ceramic
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • 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
    • B23B2228/04—Properties of materials of tools or workpieces, materials of tools or workpieces applied in a specific manner applied by chemical vapour deposition [CVD]
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • 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
    • B23B2228/08—Properties of materials of tools or workpieces, materials of tools or workpieces applied in a specific manner applied by physical vapour deposition [PVD]
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • 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

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Inorganic Chemistry (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Chemical Vapour Deposition (AREA)
  • Cutting Tools, Boring Holders, And Turrets (AREA)

Abstract

The invention discloses a coating and post-treated indexable insert and a manufacturing method thereof, wherein the indexable insert comprises a substrate and a coating on the substrate; the coating comprises a first coating coated on the clearance surface and a second coating coated on the positioning surface, the inclined surface, the clearance surface, the cutting edge and the positioning hole; the first coating comprises a CVD coating and a PVD coating; the second coating is only a CVD coating. According to the invention, on one hand, the abrasion resistance of the indexable insert can be improved under the working condition of high-feed and high-speed processing, and on the other hand, the toughness of the indexable insert under the working condition of low-speed discontinuous processing can be improved.

Description

Coating and post-treated indexable insert and manufacturing method thereof
Technical Field
The invention relates to a coated cutter for cutting and forming metal and a production method thereof, in particular to an indexable insert with a coating and post-treatment and a manufacturing method thereof.
Background
Modern high productivity metal cutting forming requires reliable tools with excellent wear and impact resistance, and in order to improve the wear resistance of cutting tools, the prior art generally applies a wear-resistant coating to a substrate, the wear-resistant coating being generally of a multilayer type, most commonly including TiC (titanium carbide), TiCN (titanium carbonitride), TiN (titanium nitride) and Al (titanium carbide) having good wear resistance2O3(alumina) and the like, and the coating is typically formed by depositing various layers onto a substrate (e.g., cemented carbide) using CVD (chemical vapor deposition). The mode of improving impact resistance is generally realized by adopting a matrix with high impact strength or a cutting edge with large passivation value. However, the coated cutting tool of the prior art has disadvantages in that the hardness is reduced by excessively rapid temperature rise of the insert due to good heat insulation of the coating layer, and edge chipping is easily caused in low-speed and discontinuous machining conditions.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides a coating and post-treated indexable insert and a manufacturing method thereof.
The technical scheme adopted by the invention for solving the technical problems is as follows: a coated and post-treated indexable insert comprising a substrate and a coating on the substrate; the matrix comprises a front surface, a back surface and at least one clearance surface, the clearance surface is intersected with the front surface and the back surface to form a cutting edge, the front surface and the back surface respectively comprise a positioning surface at a middle position, an inclined surface and a clearance surface between the positioning surface and the cutting edge, and at least one positioning hole is arranged between the front surface and the back surface; the coating comprises a first coating coated on the clearance surface and a second coating coated on the positioning surface, the inclined surface, the clearance surface, the cutting edge and the positioning hole; the first coating comprises a CVD coating and a PVD coating; the CVD coating is on the secondary surface and below the coating and comprises at least two layers selected from titanium carbide, titanium carbonitride, aluminum oxide, titanium carbonyl and titanium nitride; the PVD coating is arranged on the outer surface and comprises at least one layer selected from titanium aluminum nitride, titanium silicon nitride, chromium aluminum nitride, titanium boron nitride, titanium nitride, silicon nitride and zirconium nitride; the second coating layer is a CVD coating layer comprising at least one seed layer selected from the group consisting of titanium carbide, titanium carbonitride, aluminum oxide, titanium carbonyl, titanium nitride, and a titanium nitride layer at the outermost surface.
The thickness of the coating is 5-40 um; wherein, the thickness of aluminium oxide coating is 1 ~ 10um, and the thickness of titanium nitride coating is 0.1 ~ 3um, and the thickness that is in the PVD coating of surface is 0.5 ~ 3 um.
In the surface of the substrate, wherein the area of the coating layer accounts for 100% of the total surface of the substrate, the area of the coating surface being the PVD coating layer accounts for 15-40% of the total surface of the substrate, and the area of the coating surface being the titanium nitride layer accounts for 60-85% of the total surface of the substrate.
The substrate is cemented carbide or ceramic.
A method for manufacturing a coated and post-treated indexable insert comprises forming a CVD coating and a PVD coating on a substrate; the matrix comprises a front surface, a back surface and at least one clearance surface, the clearance surface is intersected with the front surface and the back surface to form a cutting edge, the front surface and the back surface respectively comprise a positioning surface at a middle position, an inclined surface and a clearance surface between the positioning surface and the cutting edge, and at least one positioning hole is arranged between the front surface and the back surface; when the coating is made on the substrate, the following substances are deposited on the surface of the substrate by a CVD method: the hard layer system has a total thickness of 5-40 um, and the coating comprises at least two layers selected from titanium carbide, titanium carbonitride, aluminum oxide, titanium carbonyl and titanium nitride, an aluminum oxide layer with the thickness of 1-10 um and positioned on the secondary surface of the coating, and a titanium nitride layer with the thickness of 0.1-3 um and positioned on the surface of the coating; and then, coating a PVD coating with the thickness of 0.5-3 um on the region except the positioning hole by adopting a PVD coating method, wherein the PVD coating is at least one layer selected from titanium aluminum nitride, titanium silicon nitride, chromium aluminum nitride, titanium boron nitride, titanium nitride, silicon nitride and zirconium nitride, and then removing the PVD coating except the clearance surface.
In the blade, the surface of the area of the clearance surface is gray, the area of the gray part accounts for 15-40% of the total area of the coating, the surface of the area except the clearance surface is yellow, and the area of the yellow part accounts for 60-85% of the total area of the coating.
The invention adopts PVD coating to reduce the tensile stress existing in CVD coating.
The PVD coating except the clearance surface is removed by sand blasting under the pressure of 1-3 Bar or polishing at the rotating speed of 100-400 r/min by the pressing amount of 0-5 mm.
Compared with the prior art, the invention has the beneficial effects that:
the invention analyzes the defects of wear resistance or toughness of the product according to the prior art by combining with the failure mode of the product, analyzes the stress conditions of different parts of the blade in the cutting process, and obtains that the parts of the blade of the CVD coating except for the clearance surface and the positioning hole need to reduce the tensile stress of the coating for adapting to larger stress conditions. The clearance surface of the blade is designed into the CVD coating except the clearance surface, and the function of the structure only needs to meet the non-functional function of identifying whether the blade is used or not and does not need to reduce the tensile stress of the CVD coating; the invention obviously reduces the tensile stress of the CVD coating at the part with the stress condition different from that of the clearance surface in the cutting process by a PVD method, and is better suitable for larger stress working conditions. In particular, two different colors of the grey of the clearance surface and the yellow of the rest parts are formed on the blade, so that a user can distinguish the blade with the special color at a glance. Thus, the tensile stress of the CVD coating is reduced by PVD coating by arc ion plating the coated insert and removing the outermost PVD coating except for the clearance surfaces to expose TiN by post-treatment of the coated insert such as sand blasting or brush polishing.
The invention deposits the following substances onto the surface of a substrate coated with CVD by means of a special PVD method: the thickness of the coating is 5-40 um; wherein the thickness of the aluminum oxide coating is 1-10 um, and the thickness of the titanium nitride coating is 0.1-3 um; coating a coating with the thickness of 0.5-3 um by adopting a PVD coating method, reducing the tensile stress of the CVD coating, and removing at least the PVD coating except the clearance surface through post-treatment; on one hand, the abrasion resistance of the indexable insert can be improved under the high-feed and high-speed machining working condition, and on the other hand, the toughness of the indexable insert under the low-speed discontinuous machining working condition can be improved.
The invention is further explained in detail with the accompanying drawings and the embodiments; a coated and post-treated indexable insert and method of making the same of the present invention is not limited to the embodiments.
Drawings
FIG. 1 is a schematic perspective view of an indexable insert of an embodiment of the invention;
FIG. 2-1 is a 200X optical microscope photomicrograph of an embodiment of the invention (at the clearance surface);
FIG. 2-2 is a 500 scanning electron microscope photomicrograph of an embodiment of the invention (at the clearance surface);
FIG. 3-1 is a 200X optical microscope photomicrograph of an embodiment of the invention (at the site of the hole);
FIG. 3-2 is a 500X scanning electron microscope photomicrograph of an embodiment of the invention (at the location of the hole)
FIG. 4-1 is a 200X optical microscope photomicrograph of an example of the invention (blasting at 3.0Bar to remove titanium aluminum nitride);
FIG. 4-2 is a 500 scanning electron microscope photomicrograph of an example of the invention (blasting at 3.0Bar to remove titanium aluminum nitride);
FIG. 5-1 is a 200X optical microscope photomicrograph of a comparative example (after grit blasting at 1.8Bar to remove the coating);
FIG. 5-2 is a 200X optical microscope photomicrograph of a comparative example (after grit blasting at 2.0Bar to remove the coating);
FIGS. 5-3 are 200X optical microscope micrographs of comparative examples (after grit blasting at 2.2Bar to remove the coating).
Detailed Description
Referring to fig. 1, a coated and post-treated indexable insert of the present invention includes a substrate and a coating on the substrate; the base body comprises a front surface 1, a back surface 2 and at least one clearance surface 3, the clearance surface 3 is intersected with the front surface 1 and the back surface 2 to form a cutting edge 4, the front surface and the back surface respectively comprise a positioning surface 5 at a middle position, an inclined surface 6 between the positioning surface and the cutting edge and a clearance surface 7, and a positioning hole 8 is arranged between the front surface and the back surface; the coating comprises a first coating coated on the clearance surface 3 and a second coating coated on the positioning surface 5, the inclined surface 6, the clearance surface 7, the cutting edge 4 and the positioning hole 8; the first coating comprises a CVD coating and a PVD coating; the CVD coating is on the secondary surface and below the coating and comprises at least two layers selected from titanium carbide, titanium carbonitride, aluminum oxide, titanium carbonyl and titanium nitride; the PVD coating is arranged on the outer surface and comprises at least one layer selected from titanium aluminum nitride, titanium silicon nitride, chromium aluminum nitride, titanium boron nitride, titanium nitride, silicon nitride and zirconium nitride; the second coating layer is a CVD coating layer comprising at least one seed layer selected from the group consisting of titanium carbide, titanium carbonitride, aluminum oxide, titanium carbonyl, titanium nitride, and a titanium nitride layer at the outermost surface. The second coating is free of a PVD coating.
The thickness of the coating is 5-40 um; wherein, the thickness of aluminium oxide coating is 1 ~ 10um, and the thickness of titanium nitride coating is 0.1 ~ 3um, and the thickness of titanium aluminum nitride coating is 0.5 ~ 3 um.
In the surface of the substrate, wherein the area of the coating layer accounts for 100% of the total surface of the substrate, the area of the coating layer surface being the titanium aluminum nitride layer accounts for 15-40% of the total surface of the substrate, and the area of the coating layer surface being the titanium nitride layer accounts for 60-85% of the total surface of the substrate.
The substrate is cemented carbide or ceramic.
The invention relates to a method for manufacturing a coating and a post-processed indexable insert, which comprises the steps of manufacturing a CVD coating and a PVD coating on a substrate; the matrix comprises a front surface, a back surface and at least one clearance surface, the clearance surface is intersected with the front surface and the back surface to form a cutting edge, the front surface and the back surface respectively comprise a positioning surface at a middle position, an inclined surface and a clearance surface between the positioning surface and the cutting edge, and at least one positioning hole is arranged between the front surface and the back surface; when the coating is made on the substrate, the following substances are deposited on the surface of the substrate by a CVD method: the hard layer system has a total thickness of 5-40 um, and the coating comprises at least two layers selected from titanium carbide, titanium carbonitride, aluminum oxide, titanium carbonyl and titanium nitride, an aluminum oxide layer with the thickness of 1-10 um and positioned on the secondary surface of the coating, and a titanium nitride layer with the thickness of 0.1-3 um and positioned on the surface of the coating; then, coating a PVD coating with the thickness of 0.5-3 um on the region except the positioning hole by adopting a PVD coating method, wherein the PVD coating is at least one layer selected from titanium aluminum nitride, titanium silicon nitride, chromium aluminum nitride, titanium boron nitride, titanium nitride, silicon nitride and zirconium nitride; the PVD coating is then removed except for the clearance.
In the blade, the surface of the area of the clearance surface is gray, the area of the gray part accounts for 15-40% of the total area of the coating, the surface of the area except the clearance surface is yellow, and the area of the yellow part accounts for 60-85% of the total area of the coating.
The invention adopts a PVD method and a special post-treatment method to reduce the tensile stress existing in the CVD coating.
The PVD coating except the clearance surface is removed by sand blasting under the pressure of 1-3 Bar or polishing at the rotating speed of 100-400 r/min by the pressing amount of 0-5 mm. That is, the titanium nitride layer is removed by sandblasting at a pressure of 1 to 3Bar or by polishing at a rotation speed of 100 to 400r/min by a pressing amount of 0 to 5 mm.
The invention relates to a coating and post-processed indexable insert and a manufacturing method thereof, which are characterized in that the defects of wear resistance or toughness of a product are analyzed according to the prior art by combining with the failure mode of the product, the stress conditions of different parts of the insert in the cutting process are analyzed, and the situation that the parts of the CVD coating insert except for a clearance surface and a positioning hole need to reduce the tensile stress of the coating for adapting to the larger stress condition is obtained. The clearance surface of the blade is designed into the CVD coating except the clearance surface, and the function of the structure only needs to meet the non-functional function of identifying whether the blade is used or not and does not need to reduce the tensile stress of the CVD coating; the invention obviously reduces the tensile stress of the CVD coating at the part with the stress condition different from that of the clearance surface in the cutting process by a PVD method, and is better suitable for larger stress working conditions. In particular, two different colors of the grey of the clearance surface and the yellow of the rest parts are formed on the blade, so that a user can distinguish the blade with the special color at a glance. Therefore, the tensile stress of the CVD coating is reduced by PVD coating by arc ion plating the coated insert, followed by removal of the outermost TiAlN coating except for the clearance to expose TiN by post-treatment of the coated insert such as sand blasting or brush polishing.
The invention deposits the following substances on the surface of a substrate by two coating modes: the total thickness is 5-40 um; wherein the thickness of the aluminum oxide coating is 1-10 um, and the thickness of the titanium nitride coating is 0.1-3 um; then, coating a titanium aluminum nitride coating with the thickness of 0.5-3 um by adopting a PVD coating method, reducing the tensile stress of the CVD coating, and then removing the PVD coating except the clearance surface at least through post-treatment; on one hand, the abrasion resistance of the indexable insert can be improved under the high-feed and high-speed machining working condition, and on the other hand, the toughness of the indexable insert under the low-speed discontinuous machining working condition can be improved.
The invention has the advantages that the appearance is gray and yellow, the impact resistance and the stability of steel vehicle products with CVD coatings can be functionally improved, and the specific PVD method tensile stress removing treatment technology and the special coating post-treatment technology can achieve better coating bonding force effect on performance, so that the cutting life of the products can be effectively prolonged.
A coated and post-treated indexable insert and a method of making the same according to the present invention are further described below by comparing an embodiment of the present invention with a comparative example.
Examples of the invention
FIG. 2-1 is a 200X optical microscope photomicrograph showing a clearance surface of an insert according to the present invention with an outermost layer applied by PVD over a CVD coating, in FIG. 2-1: A1-TiAlN;
fig. 2-2 is a 500X scanning electron microscope photomicrograph showing a clearance surface of an insert according to the present invention with an outermost layer applied by PVD over a CVD coating, in fig. 2-2: A2-TiAlN;
fig. 3-1 is a 200X optical microscope photomicrograph showing the TiN outermost layer of the pilot hole of the insert according to the present invention, in fig. 3-1: A3-TiN;
fig. 3-2 is a 500X scanning electron microscope photomicrograph showing the TiN outermost layer of the pilot hole of the insert according to the present invention, in fig. 3-2: A4-TiN;
fig. 4-1 is a 200X optical microscope photomicrograph showing the outermost layer of TiN of an insert according to the present invention without any residue after the grit blasting process, wherein, in fig. 4-1: A5-TiN;
fig. 4-2 is a 500X scanning electron microscope photomicrograph showing the outermost layer of TiN of an insert according to the present invention without any residue after the grit blasting process, wherein, in fig. 4-2: A6-TiN;
sample a (invention): cemented carbide cutting inserts WNMG080408-QM were coated by CVD technique with a composition of 7.0 Wt-% Co, 9.0 Wt-% cubic carbide (TiC + TaC + NbC) and balance WC in the order 0.8 μmTiN, 3.0 μmti (cn), 4.0 μm a-Al2O3, 1.2 μmTiN;
depositing the coating by a CVD method;
coating TiAlN to the coated insert by PVD techniques;
by using Al2O3Sand grains, post-treating the coated blade at a blasting pressure of 3.0 Bar.
Comparative example
Sample B (prior art): cemented carbide cutting inserts CNMG120408-PM having a composition of 5.5 Wt-% Co, 8.6 Wt-% cubic carbide (TiC + TaC + NbC) and balance WC were coated by means of a CVD technique in the order 0.7 μmTiN, 4.0 μmti (cn), 5.0 μm a-Al2O3 and 0.7 μm titanium oxide Ti2O3 and 0.7 umTiN;
deposition of Ti by CVD technique2O3A layer, the other layer being deposited by a CVD method;
by using Al2O3Grit that was post-treated by blasting at different blasting pressures, i.e. 1.8, 2.0 and 2.2 Bar.
Type A and B blades were studied with an optical microscope (200X) to find any TiN residue on the alumina surface, and further examined with a scanning electron microscope (500X) for Al removal2O3And (3) residues of the other ingredients. The amount of residue was determined using image analysis (leica quantimet 500) or energy spectral analysis. The results are summarized in the following table.
Figure BDA0001845649000000071
The foregoing is considered as illustrative of the preferred embodiments of the invention and is not to be construed as limiting the invention in any way. Although the present invention has been described with reference to the preferred embodiments, it is not intended to be limited thereto. Those skilled in the art can make many possible variations and modifications to the disclosed embodiments, or equivalent modifications, without departing from the scope of the disclosed embodiments. Therefore, any simple modification, equivalent change and modification made to the above embodiments according to the technical spirit of the present invention should fall within the protection scope of the technical scheme of the present invention, unless the technical spirit of the present invention departs from the content of the technical scheme of the present invention.

Claims (8)

1. A coated and post-treated indexable insert comprising a substrate and a coating on the substrate; the matrix comprises a front surface, a back surface and at least one clearance surface, the clearance surface is intersected with the front surface and the back surface to form a cutting edge, the front surface and the back surface respectively comprise a positioning surface at a middle position, an inclined surface and a clearance surface between the positioning surface and the cutting edge, and at least one positioning hole is arranged between the front surface and the back surface; the method is characterized in that: the coating comprises a first coating coated on the clearance surface and a second coating coated on the positioning surface, the inclined surface, the clearance surface, the cutting edge and the positioning hole; the first coating comprises a CVD coating and a PVD coating; the CVD coating is on the secondary surface and below the coating and comprises at least two layers selected from titanium carbide, titanium carbonitride, aluminum oxide, titanium carbonyl and titanium nitride; the PVD coating is arranged on the outer surface and comprises at least one layer selected from titanium aluminum nitride, titanium silicon nitride, chromium aluminum nitride, titanium boron nitride, titanium nitride, silicon nitride and zirconium nitride; the second coating layer is a CVD coating layer comprising at least two layers selected from the group consisting of titanium carbide, titanium carbonitride, alumina, titanium carbonyl, titanium nitride, and a titanium nitride layer at the outermost surface.
2. The coated and post-treated indexable insert of claim 1, wherein: the thickness of the CVD coating is 5-40 um; the CVD coating comprises at least two layers selected from titanium carbide, titanium carbonitride, aluminum oxide, titanium carbonyl and titanium nitride, an aluminum oxide layer which is 1-10 um thick and is positioned on the secondary surface of the coating, and a titanium nitride layer which is 0.1-3 um thick and is positioned on the surface of the coating, wherein the thickness of the PVD coating positioned on the outer surface is 0.5-3 um.
3. The coated and post-treated indexable insert of claim 1, wherein: in the surface of the substrate, wherein the area of the coating layer represents 100% of the total surface of the substrate, the area of the coating surface being the PVD coating layer represents 15-40% of the total surface of the substrate, and the area of the coating surface being the CVD coating layer represents 60-85% of the total surface of the substrate.
4. The coated and post-treated indexable insert of claim 1 or 3, wherein: the substrate is cemented carbide or ceramic.
5. A method for manufacturing a coated and post-treated indexable insert comprises forming a CVD coating and a PVD coating on a substrate; the matrix comprises a front surface, a back surface and at least one clearance surface, the clearance surface is intersected with the front surface and the back surface to form a cutting edge, the front surface and the back surface respectively comprise a positioning surface at a middle position, an inclined surface and a clearance surface between the positioning surface and the cutting edge, and at least one positioning hole is arranged between the front surface and the back surface; the method is characterized in that: when the coating is made on the substrate, the following substances are deposited on the surface of the substrate by a CVD method: the CVD coating comprises at least two layers selected from titanium carbide, titanium carbonitride, aluminum oxide, titanium carbonyl and titanium nitride, an aluminum oxide layer with the thickness of 1-10 um and a titanium nitride layer with the thickness of 0.1-3 um and positioned on the secondary surface of the coating; and then, coating a PVD coating with the thickness of 0.5-3 um on the region except the positioning hole by adopting a PVD coating method, wherein the PVD coating is at least one layer selected from titanium aluminum nitride, titanium silicon nitride, chromium aluminum nitride, titanium boron nitride, titanium nitride, silicon nitride and zirconium nitride, and then removing the PVD coating except the clearance surface.
6. The method of making the coated and post-treated indexable insert of claim 5, wherein: in the blade, the surface of the area of the clearance surface is gray, the area of the gray part accounts for 15-40% of the total area of the coating, the surface of the area except the clearance surface is yellow, and the area of the yellow part accounts for 60-85% of the total area of the coating.
7. The method of making the coated and post-treated indexable insert of claim 5, wherein: PVD coating is used to reduce the tensile stress present in CVD coatings.
8. The method of making the coated and post-treated indexable insert of claim 5, wherein: the PVD coating except the clearance surface is removed by sand blasting under the pressure of 1-3 Bar or polishing at the rotating speed of 100-400 r/min by the pressing amount of 0-5 mm.
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Citations (8)

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