Device for preparing incompletely covering coating on cemented carbide blade and method for preparing multilayer-coated cemented carbide blade

Abstract

Disclosed in the present invention are a device for preparing an incompletely covering coating on a cemented carbide blade and a method for preparing a multilayer-coated cemented carbide blade. The device comprises a base plate (1) and / or a cover plate (2) which can be placed in a high-temperature coating furnace, wherein the base plate (1) is plate-shaped, and a cavity (3) capable of accommodating a blade to be coated (9) is formed on an upper surface (10); a back coating opening (4) penetrating through an outer peripheral surface of the base plate (1) is formed on a side surface (31) of the cavity (3), and the back coating opening (4) at least corresponds to any incompletely covering coating unit to be formed on a back cutting surface (92) of said blade (9); the cover plate (2) can cover a front cutting surface (91) of said blade (9), the cover plate (2) is provided with a front coating opening (5) penetrating through the upper and lower surfaces of the cover plate (2), and the front coating opening (5) at least corresponds to any incompletely covering coating unit to be formed on the front cutting surface (91) of said blade (9). By means of the device of the present invention, the method can achieve the preparation of a layer of incompletely covering coating units on the surface of the cemented carbide blade, and the prepared multilayer-coated blade is stable and reliable and has good coating performance.

Description

A device for preparing an incomplete covering coating of a cemented carbide insert and a method for preparing a multi-layer coated cemented carbide insert

[0001] Cross-reference to Related Applications

[0002] The present application is based on a Chinese patent application with the application date of "2024-06-28", the application number of "202410860106.2", and the invention name of "A device for preparing an incomplete covering coating of a cemented carbide insert and a method for preparing a multi-layer coated cemented carbide insert", and claims the priority of the Chinese patent application, the whole content of which is incorporated into the present application as a part of the present application. TECHNICAL FIELD

[0003] The present application mainly relates to a metal cutting tool forming die, in particular to a device for preparing an incomplete covering coating of a cemented carbide insert and a method for preparing a multi-layer coated cemented carbide insert. BACKGROUND

[0004] The metal cutting insert made of cemented carbide material has a large friction during cutting, and is prone to generate built-up edge, and can only be applied to parameter working conditions with low cutting speed, and has a short service life. In the prior art, a coating process is usually used on the surface of the cemented carbide insert, that is, a certain thickness of refractory compound such as carbide, nitride and oxide is coated, so that the surface of the cutting insert has the characteristics of high hardness, high wear resistance, high heat resistance and low friction coefficient, and the built-up edge is eliminated, and the cutting performance and service life of the cutting insert can be greatly improved.

[0005] The production process of the coated cemented carbide insert is generally: after powder forming, sintering to obtain a finished product, surface treatment, and then conveying to a coating furnace for coating process. The commonly used double-color cutting insert in the prior art is obtained by composite coating process, and then by sand blasting or other mechanical surface treatment, forming two kinds of coatings in visual effect. Because the coating furnace has high temperature and the coating process is complex, in order to reduce the manufacturing difficulty, a simple device is generally used to fix the cutting insert, and then the cutting insert is uniformly conveyed to the coating device for physical or chemical coating. Finally, the surface of the cutting insert can only be covered with a thin film coating of a certain thickness. The product coated by the fixing device has a relatively single coating structure, and due to the limitation of the coating process and the performance of the coating material, it is impossible to simultaneously achieve multiple performance indicators such as wear resistance, heat resistance, impact resistance and high hardness. SUMMARY

[0006] The technical problem to be solved by the present application is to overcome the shortcomings of the prior art, and to provide a device for preparing an incomplete covering coating of a cemented carbide insert and a method for preparing a multi-layer coated cemented carbide insert, which are stable and reliable, and have good coating performance.

[0007] To solve the above technical problems, the present application adopts the following technical solutions:

[0008] The device for preparing the incomplete covering coating of the cemented carbide blade comprises a high-temperature coating furnace which can spray a metal particle flow on the surface of the cemented carbide blade to form a cutting coating, and a base plate and / or a cover plate which can be arranged in the high-temperature coating furnace, wherein the base plate is plate-shaped and has a cavity on the upper surface for accommodating the blade to be coated, and a rear coating opening is arranged on the cavity side surface of the cavity and penetrates to the outer circumferential surface of the base plate, the rear coating opening at least corresponds to any incomplete covering coating unit to be formed on the rear surface of the blade to be coated, and the cover plate can be arranged on the front surface of the blade to be coated, and a front coating opening is arranged on the cover plate and penetrates the upper and lower surfaces of the cover plate, the front coating opening at least corresponds to any incomplete covering coating unit to be formed on the front surface of the blade to be coated.

[0009] In some embodiments of the present application:

[0010] The device for preparing the incomplete covering coating of the cemented carbide blade comprises a base plate and a cover plate, the outer edge of the cover plate can cover the cavity, the base plate is provided with positioning columns in the circumferential direction, the cover plate is provided with limiting grooves corresponding to the positioning columns, and the cooperation of the positioning columns and the limiting grooves can realize the circumferential fixation of the base plate to the cover plate.

[0011] The front coating openings on the cover plate are a plurality of front coating openings, the plurality of front coating openings correspond to a plurality of incomplete covering coating units on the front surface of the blade to be coated, and the front coating openings extend from the middle of the cover plate to the side surface of the cover plate.

[0012] The front coating opening on the cover plate is one front coating opening, the front coating opening corresponds to any incomplete covering coating unit on the front surface of the blade to be coated, and the front coating opening extends from the middle of the cover plate to the side surface of the cover plate.

[0013] The front coating opening on the cover plate is one front coating opening, the front coating opening corresponds to any incomplete covering coating unit on the front surface of the blade to be coated, and the front coating opening is located in the middle of the cover plate.

[0014] The cavity side surface is provided with a plurality of rear coating openings, and the plurality of rear coating openings correspond to a plurality of incomplete covering coating units on the rear surface of the blade to be coated.

[0015] The cavity side surface is provided with one rear coating opening, and the rear coating opening corresponds to any incomplete covering coating unit on the rear surface of the blade to be coated.

[0016] The device for preparing the incomplete covering coating of the cemented carbide blade further comprises a fastener for adjusting the distance between the upper surface of the base plate and the lower surface of the cover plate.

[0017] A method for preparing a multi-layer coated cemented carbide blade using the device for preparing the incomplete covering coating of the cemented carbide blade comprises the steps of: placing the blade to be coated into the cavity of the base plate so that the rear coating opening corresponds to any incomplete covering coating unit to be formed on the rear rake surface of the blade to be coated, and / or placing the cover plate on the front rake surface of the blade to be coated so that the front coating opening corresponds to any incomplete covering coating unit to be formed on the front rake surface of the blade to be coated.

[0018] In some embodiments of the present application, the method comprises the following steps:

[0019] S1: placing the blade to be coated into a chemical coating furnace or a physical coating furnace to prepare the first coating for completely covering the front and rear rake surfaces of the blade to be coated;

[0020] S2: placing the blade to be coated into the cavity of the base plate so that the rear coating opening corresponds to any incomplete covering coating unit to be formed on the rear rake surface of the blade to be coated, placing the cover plate on the base plate so that the front coating opening corresponds to any incomplete covering coating unit to be formed on the front rake surface of the blade to be coated, and then sending the base plate, the cover plate and the blade to be coated into a physical coating furnace to prepare the second coating for incompletely covering the front and rear rake surfaces of the blade to be coated.

[0021] In some embodiments of the present application, the method comprises the following steps:

[0022] S1: placing the blade to be coated into a chemical coating furnace or a physical coating furnace to prepare the first coating for completely covering the front and rear rake surfaces of the blade to be coated;

[0023] S2: placing the blade to be coated into the cavity of the base plate so that the rear coating opening corresponds to any incomplete covering coating unit to be formed on the rear rake surface of the blade to be coated, and then sending the base plate and the blade to be coated into a physical coating furnace to prepare the second coating for incompletely covering the rear rake surface of the blade to be coated.

[0024] In some embodiments of the present application, the method comprises the following steps:

[0025] S1: placing the blade to be coated into a chemical coating furnace or a physical coating furnace to prepare the first coating for completely covering the front and rear rake surfaces of the blade to be coated;

[0026] S2: Covering the rake face of the coated blade with the cover plate, making the front coating opening correspond to any incomplete covering coating unit to be formed on the rake face of the coated blade, and then putting the cover plate and the coated blade into the physical coating furnace as a whole to prepare the incomplete covering coating, i.e. the second coating, on the rake face of the coated blade.

[0027] Specifically comprising the following steps:

[0028] S1: Putting the coated blade into the cavity of the bottom plate, making the rear coating opening correspond to any incomplete covering coating unit to be formed on the rake face of the coated blade, and then putting the cover plate onto the bottom plate, making the front coating opening correspond to any incomplete covering coating unit to be formed on the rake face of the coated blade, and then putting the bottom plate, the cover plate and the coated blade into the physical coating furnace as a whole to prepare the incomplete covering coating, i.e. the first coating, on the rake face and the rear face of the coated blade;

[0029] S2: Putting the coated blade into the physical coating furnace after the placement to prepare the second coating covering the rake face and the rear face of the coated blade.

[0030] Using multiple cover plates with different front coating opening settings, repeating the above step S2 to form the second coating with multiple incomplete covering coating units.

[0031] Using one cover plate and changing the position of the front coating opening on the cover plate relative to the rake face of the coated blade, repeating the above step S2 to form the second coating with multiple incomplete covering coating units.

[0032] Before the step S2, jetting the cutting edge of the coated blade after the preparation of the first coating, using corundum particles with a particle size of 120-150 mesh and a jetting time of 1-3 minutes; after the step S2, jetting the cutting edge of the coated blade after the preparation of the second coating, using corundum particles with a particle size of 120-150 mesh and a jetting time of 1-3 minutes.

[0033] The first coating is an Al2O3 and / or Ti(C, N) coating.

[0034] The second coating is a (Ti, Al)N and / or (Ti, Cr)N and / or (Ti, Si)N and / or (Ti, Zr)N coating.

[0035] The second coating is a (Ti, Al, Cr)N and / or (Ti, Al, Zr)N and / or (Ti, Al, Si)N and / or (Ti, Al, Y)N coating.

[0036] The first coating is a (Ti, Al)N and / or (Ti, Cr)N and / or (Ti, Si)N and / or (Ti, Zr)N coating.

[0037] The second coating is a (Ti, Al)N and / or (Ti, Cr)N and / or (Ti, Si)N and / or (Ti, Zr)N coating.

[0038] The first coating is a (Ti, Al, Cr)N and / or (Ti, Al, Zr)N and / or (Ti, Al, Si)N and / or (Ti, Al, Y)N coating.

[0039] The second coating is a (Ti, Al, Cr)N and / or (Ti, Al, Zr)N and / or (Ti, Al, Si)N and / or (Ti, Al, Y)N coating.

[0040] The second coating is a (Ti, Al)N and / or (Ti, Cr)N and / or (Ti, Si)N and / or (Ti, Zr)N coating.

[0041] Compared with the prior art, the present application has the following advantages:

[0042] (1) The device for preparing the incomplete covering coating of the cemented carbide blade of the present application comprises a base plate and / or a cover plate, the base plate is plate-shaped and has a cavity on the upper surface for accommodating the blade to be coated, a rear coating opening is formed on the cavity side of the cavity and penetrates to the outer peripheral surface of the base plate, the rear coating opening corresponds to at least any incomplete covering coating unit to be formed on the rear surface of the blade to be coated, the cover plate can be arranged on the front surface of the blade to be coated, a front coating opening is formed on the cover plate and penetrates the upper and lower surfaces of the cover plate, the front coating opening corresponds to at least any incomplete covering coating unit to be formed on the front surface of the blade to be coated, during coating, the front coating opening on the cover plate can form a coating, and the area without the coating opening will not produce a coating, so that the required incomplete covering coating unit can be prepared according to the cutting function difference of each cutting edge, the incomplete covering coating unit of the cemented carbide blade can be prepared by arranging a plurality of cover plates with different structures or changing the position of the coating opening of the cover plate relative to the blade to be coated, and the coating thickness difference of different areas can be realized according to the actual cutting requirement by the combination of the incomplete covering coating unit and the complete coating, so as to improve the cutting performance of the coated blade.

[0043] (2) The method for preparing the multi-layer coated cemented carbide blade of the present application, using the device for preparing the partially uncovered coated cemented carbide blade of the present application, comprises the steps of: loading the blade to be coated into the cavity of the base plate, making the rear coating opening correspond to any partially uncovered coating unit to be formed on the rear rake surface of the blade to be coated, and / or covering the front rake surface of the blade to be coated with the cover plate, making the front coating opening correspond to any partially uncovered coating unit to be formed on the front rake surface of the blade to be coated, through which step, the coating can be formed at the coating openings on the cover plate and the base plate, while the areas without coating openings will not produce coating, so that the required partially uncovered coating unit can be prepared according to the cutting function difference of each cutting edge, and through the setting of multiple cover plates with different structures or the change of the position of the coating opening of the cover plate relative to the blade to be coated, the multi-layer coating with different structures can be realized, thereby improving the cutting performance of the prepared multi-layer coated blade. BRIEF DESCRIPTION OF DRAWINGS

[0044] Fig. 1 is a perspective view of the first embodiment of the device for preparing the partially uncovered coated cemented carbide blade of the present application;

[0045] Fig. 2 is a perspective view of the base plate of the first embodiment of the device for preparing the partially uncovered coated cemented carbide blade of the present application;

[0046] Fig. 3 is a perspective view of the cover plate of the first embodiment of the device for preparing the partially uncovered coated cemented carbide blade of the present application;

[0047] Fig. 4 is a perspective view of the multi-layer coated cemented carbide blade prepared by the first embodiment of the device for preparing the partially uncovered coated cemented carbide blade of the present application;

[0048] Fig. 5 is a perspective view of the cover plate of the second embodiment of the device for preparing the partially uncovered coated cemented carbide blade of the present application;

[0049] Fig. 6 is a perspective view of the multi-layer coated cemented carbide blade prepared by the second embodiment of the device for preparing the partially uncovered coated cemented carbide blade of the present application;

[0050] Fig. 7 is a perspective view of the third embodiment of the device for preparing the partially uncovered coated cemented carbide blade of the present application and the multi-layer coated cemented carbide blade prepared thereby;

[0051] Fig. 8 is a front view of the third embodiment of the device for preparing the partially uncovered coated cemented carbide blade of the present application;

[0052] Fig. 9 is a perspective view of the fourth embodiment of the device for preparing the partially uncovered coated cemented carbide blade of the present application;

[0053] Fig. 10 is a perspective view of the fourth embodiment of the device for preparing the incomplete covering coating of the cemented carbide blade of the present application installed in place;

[0054] Fig. 11 is a perspective view of the fourth embodiment of the device for preparing the incomplete covering coating of the cemented carbide blade of the present application and the multilayer coated cemented carbide blade prepared thereby;

[0055] Fig. 12 is a perspective view of the cover plate of the fifth embodiment of the device for preparing the incomplete covering coating of the cemented carbide blade of the present application;

[0056] Fig. 13 is a perspective view of the fifth embodiment of the device for preparing the incomplete covering coating of the cemented carbide blade of the present application and the multilayer coated cemented carbide blade prepared thereby;

[0057] In the figures, the reference numerals represent: 1, base plate; 10, upper surface; 2, cover plate; 3, cavity; 31, cavity side surface; 4, rear coating opening; 5, front coating opening; 6, positioning column; 7, limiting groove; 8, fastener; 9, blade to be coated; 91, rake face; 92, relief face; 93, base surface; 94, peripheral cutting edge; 95, end cutting edge; 11, first coating; 12, second coating; 13, incomplete covering coating unit.

DETAILED DESCRIPTION

[0058] The present application will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0059] In the description of the present application, it should be noted that the terms "upper", "lower", "inner", "outer", "bottom", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application.

[0060] Fig. 1 to Fig. 4 show a first embodiment of the device for preparing the incomplete covering coating of the cemented carbide blade of the present application, which comprises a high-temperature coating furnace capable of spraying a metal particle stream to form a cutting coating on the surface of the cemented carbide blade, and a base plate 1 and a cover plate 2 which can be placed in the high-temperature coating furnace. The base plate 1 is plate-shaped and has a top surface 10 with a cavity 3 for accommodating the blade 9 to be coated. The cover plate 2 can be placed on the rake face 91 of the blade 9 to be coated. The cover plate 2 has front coating openings 5 extending through the top and bottom surfaces of the cover plate 2. There are a plurality of front coating openings 5, which correspond to the incomplete covering coating units to be formed on the rake face 91 of the blade 9 to be coated. During coating, coating is formed at the coating openings on the cover plate 2, while no coating is formed at the areas without coating openings. Thus, the desired incomplete covering coating units can be prepared according to the differences in cutting functions of the cutting edges. By providing a plurality of cover plates with different structures or changing the positions of the coating openings on the cover plate relative to the blade to be coated, the incomplete covering coating units of the cemented carbide blade can be prepared. Through the combination of the incomplete covering coating units and the complete coating, the coating thickness of different areas can be adjusted according to the actual cutting requirements, thereby improving the cutting performance of the coated blade.

[0061] In this embodiment, the outer edge of the cover plate 2 can cover the cavity 3. The base plate 1 is provided with positioning columns 6 around the circumference, and the cover plate 2 is provided with limiting grooves 7 corresponding to the positioning columns 6. The cooperation between the positioning columns 6 and the limiting grooves 7 can realize the circumferential fixation of the cover plate 2 to the base plate 1.

[0062] In this embodiment, there are four front coating openings 5 on the cover plate 2, which correspond to the plurality of incomplete covering coating units on the rake face 91 of the blade 9 to be coated. The front coating openings 5 extend from the middle of the cover plate 2 to the side surface of the cover plate 2. When the cover plate 2 is placed on the rake face 91 of the blade 9 to be coated, four incomplete covering coating units can be formed in one coating preparation. These four incomplete covering coating units form the second coating 12 of the blade 9 to be coated. That is, the end cutting edge 95 of the blade 9 to be coated corresponds to two layers of coating (the first coating 11 and the second coating 12), and the peripheral cutting edge 94 corresponds to one layer of coating (the first coating 11).

[0063] Fig. 5 and Fig. 6 show a second embodiment of the device for preparing the incomplete covering coating of the cemented carbide blade of the present application, which is basically the same as the first embodiment. The difference is that, in this embodiment, there is only one front coating opening 5 on the cover plate 2, which corresponds to any incomplete covering coating unit on the rake face 91 of the blade 9 to be coated. The front coating opening 5 extends from the middle of the cover plate 2 to the side surface of the cover plate 2.

[0064] By the cover plate 2 of the present embodiment covering on the rake face 91 of the blade 9 to be coated, one-time coating preparation can form one incomplete covering coating unit, different cover plates 2 can be arranged through the plurality of front coating openings 5, and through multiple coating preparations, a plurality of different structure incomplete covering coating units can be formed on the rake face 91 of the blade 9 to be coated.

[0065] Figs. 7 and 8 show a third embodiment of the device for preparing the incomplete covering coating of the cemented carbide blade of the present application, which is basically the same as the first embodiment, and the difference is that in the present embodiment, the device for preparing the incomplete covering coating of the cemented carbide blade further comprises a fastener 8 for adjusting the distance between the upper surface of the base plate 1 and the lower surface of the cover plate 2. After the blade 9 to be coated is placed in the cavity 3 and the fastener 8 is installed, the distance between the cover plate 2 and the base plate 1 can be changed by the fastener 8, and by using the distance, an annular incomplete covering coating unit can be formed on the relief face 92 of the blade 9 to be coated during coating preparation.

[0066] Figs. 9 to 11 show a fourth embodiment of the device for preparing the incomplete covering coating of the cemented carbide blade of the present application, which is basically the same as the first embodiment, and the difference is that in the present embodiment, the cavity side surface 31 of the cavity 3 of the base plate 1 is provided with a rear coating opening 4 penetrating to the outer peripheral surface of the base plate 1, and the rear coating opening 4 is a plurality of and corresponds to the incomplete covering coating units to be formed on the relief face 92 of the blade 9 to be coated. A plurality of rear coating openings 4 are provided on the cavity side surface 31, and the plurality of rear coating openings 4 correspond to the plurality of incomplete covering coating units on the relief face 92 of the blade 9 to be coated.

[0067] In addition to the structure of the present embodiment, only one rear coating opening 4 can be provided, and one-time coating preparation can form one incomplete covering coating unit on the relief face 92 of the blade 9 to be coated.

[0068] Figs. 12 and 13 show a fifth embodiment of the device for preparing the incomplete covering coating of the cemented carbide blade of the present application, which is basically the same as the first embodiment, and the difference is that in the present embodiment, the front coating opening 5 on the cover plate 2 is one, the front coating opening 5 corresponds to any incomplete covering coating unit on the rake face 91 of the blade 9 to be coated, and the front coating opening 5 is located in the middle of the cover plate 2.

[0069] The method for manufacturing the multilayer coated cemented carbide blade of the present application can use the device for manufacturing the partially covered coated cemented carbide blade in the above embodiment, and comprises the steps of: placing the blade to be coated into the cavity 3 of the base plate 1, so that the rear coating opening 4 corresponds to any partially covered coating unit to be formed on the rear face 92 of the blade to be coated 9, and / or placing the cover plate 2 on the rake face 91 of the blade to be coated 9, so that the front coating opening 5 corresponds to any partially covered coating unit to be formed on the rake face 91 of the blade to be coated 9.

[0070] Through this step, the coating can be formed at the coating openings on the cover plate 2 and the base plate 1, and no coating is formed in the areas without coating openings, so that the desired partially covered coating unit can be manufactured according to the cutting function difference of the cutting edges at different positions, and the multilayer coating with different structures can be realized by arranging a plurality of cover plates with different structures or changing the position of the coating opening of the cover plate relative to the blade to be coated, thereby improving the cutting performance of the manufactured multilayer coated blade.

[0071] The method for manufacturing the multilayer coated cemented carbide blade of the present application can have various embodiments:

[0072] The first embodiment specifically comprises the following steps:

[0073] S1: placing the blade to be coated 9 into the chemical coating furnace or the physical coating furnace after being placed, and performing the preparation of the first coating 11 for completely covering the rake face 91 and the rear face 92 of the blade to be coated 9;

[0074] S2: placing the blade to be coated 9 into the cavity 3 of the base plate 1, so that the rear coating opening 4 corresponds to any partially covered coating unit to be formed on the rear face 92 of the blade to be coated 9, and placing the cover plate 2 on the base plate 1, so that the front coating opening 5 corresponds to any partially covered coating unit to be formed on the rake face 91 of the blade to be coated 9, and then placing the base plate 1, the cover plate 2 and the blade to be coated 9 into the physical coating furnace as a whole, and performing the preparation of the second coating 12 for partially covering the rake face 91 and the rear face 92 of the blade to be coated 9.

[0075] In this embodiment, a plurality of cover plates 2 with different front coating openings 5 are used, and the above step S2 is repeated to form the second coating with a plurality of partially covered coating units.

[0076] In this embodiment, the first coating 11 is an Al2O3 and / or Ti(C, N) coating.

[0077] In this embodiment, the second coating 12 is a (Ti, Al)N and / or (Ti, Cr)N and / or (Ti, Si)N and / or (Ti, Zr)N coating.

[0078] In this embodiment, the second coating 12 is a (Ti, Al, Cr)N and / or (Ti, Al, Zr)N and / or (Ti, Al, Si)N and / or (Ti, Al, Y)N coating.

[0079] The second embodiment specifically comprises the following steps:

[0080] S1: after the coated blade 9 is placed, it is sent into a chemical coating furnace or a physical coating furnace to prepare the first coating 11 which completely covers the rake face 91 and the flank face 92 of the coated blade 9;

[0081] S2: the coated blade 9 is loaded into the cavity 3 of the base plate 1, the rear coating opening 4 is corresponded to any incomplete covering coating unit to be formed on the flank face 92 of the coated blade 9, and then the base plate 1 and the coated blade 9 are sent into a physical coating furnace to prepare the second coating 12 which is an incomplete covering coating of the flank face 92 of the coated blade 9.

[0082] In this embodiment, the first coating 11 is a (Ti, Al)N and / or (Ti, Cr)N and / or (Ti, Si)N and / or (Ti, Zr)N coating.

[0083] In this embodiment, the second coating 12 is a (Ti, Al)N and / or (Ti, Cr)N and / or (Ti, Si)N and / or (Ti, Zr)N coating.

[0084] The third embodiment specifically comprises the following steps:

[0085] S1: after the coated blade 9 is placed, it is sent into a chemical coating furnace or a physical coating furnace to prepare the first coating 11 which completely covers the rake face 91 and the flank face 92 of the coated blade 9;

[0086] S2: the cover plate 2 is covered on the rake face 91 of the coated blade 9, the front coating opening 5 is corresponded to any incomplete covering coating unit to be formed on the rake face 91 of the coated blade 9, and then the cover plate 2 and the coated blade 9 are sent into a physical coating furnace to prepare the second coating 12 which is an incomplete covering coating of the rake face 91 of the coated blade 9.

[0087] In this embodiment, one cover plate 2 is used and the position of the front coating opening 5 of the cover plate 2 relative to the rake face 91 of the coated blade 9 is changed, and the above step S2 is repeated to form the second coating with multiple incomplete covering coating units.

[0088] In this embodiment, the first coating 11 is a (Ti, Al, Cr)N and / or (Ti, Al, Zr)N and / or (Ti, Al, Si)N and / or (Ti, Al, Y)N coating.

[0089] In this embodiment, the second coating 12 is a (Ti, Al, Cr)N and / or (Ti, Al, Zr)N and / or (Ti, Al, Si)N and / or (Ti, Al, Y)N coating.

[0090] In the fourth embodiment, the steps include:

[0091] S1: the blade to be coated 9 is loaded into the cavity 3 of the base 1, the rear coating opening 4 is corresponded to any incomplete coating unit to be formed on the rear face 92 of the blade to be coated 9, the cover plate 2 is installed on the base 1, the front coating opening 5 is corresponded to any incomplete coating unit to be formed on the front face 91 of the blade to be coated 9, and then the base 1, the cover plate 2 and the blade to be coated 9 are sent into a physical coating furnace as a whole to prepare the incomplete coating, i.e. the first coating 11, on the front face 91 and the rear face 92 of the blade to be coated 9;

[0092] S2: after the blade to be coated 9 is placed, it is sent into the physical coating furnace to prepare the second coating 12 for completely covering the front face 91 and the rear face 92 of the blade to be coated 9.

[0093] In this embodiment, the second coating 12 is a (Ti, Al)N and / or (Ti, Cr)N and / or (Ti, Si)N and / or (Ti, Zr)N coating.

[0094] In the above embodiments one to three, the blade edge of the blade to be coated 9 after the preparation of the first coating 11 is jetted, corundum particles with a particle size of 120-150 mesh are used, and the jetting time is 1-3 minutes; after the step S2, the blade edge of the blade to be coated 9 after the preparation of the second coating 12 is jetted, corundum particles with a particle size of 120-150 mesh are used, and the jetting time is 1-3 minutes.

[0095] Although the present application has been disclosed with reference to the preferred embodiments above, it is not intended to limit the present application. Any person skilled in the art can make many possible changes and modifications to the technical solutions disclosed above, or modify equivalent embodiments with equivalent changes, without departing from the scope of the technical solutions of the present application. Therefore, any simple modification, equivalent change and modification made to the above embodiments according to the technical essence of the present application, without departing from the content of the technical solutions of the present application, shall fall within the scope of protection of the technical solutions of the present application.

Claims

1. A method for preparing multi-layer coated cemented carbide cutting tools, wherein the coating preparation apparatus includes a high-temperature coating furnace and a chassis (1) and a cover plate (2) that can be placed inside the high-temperature coating furnace, the high-temperature coating furnace can spray a stream of metal particles onto the surface of the cemented carbide cutting tool to form a cutting coating, the chassis (1) is plate-shaped and has a cavity (3) on its upper surface (10) for accommodating the cutting tool (9) to be coated, and a post-coating opening (4) extending through to the outer periphery of the chassis (1) is provided on the side surface (31) of the cavity (3). The post-coating opening (4) corresponds at least to any partially covered coating unit to be formed on the back face (92) of the blade to be coated (9). The cover plate (2) can be placed on the front face (91) of the blade to be coated (9). The cover plate (2) has a pre-coating opening (5) that penetrates the upper and lower surfaces of the cover plate (2). The pre-coating opening (5) corresponds at least to any partially covered coating unit to be formed on the front face (91) of the blade to be coated (9). The method for preparing multi-layer coated cemented carbide cutting tools includes the following steps: S1: After placing the blade (9) to be coated, send it into a chemical coating furnace or a physical coating furnace to prepare the first coating (11) that completely covers the front face (91) and back face (92) of the blade (9); S2: The blade (9) to be coated is installed into the cavity (3) of the chassis (1), so that the rear coating opening (4) on the cavity side (31) of the cavity (3) that extends to the outer periphery of the chassis (1) corresponds to any incomplete coating unit to be formed on the rear cutting face (92) of the blade (9) to be coated. The cover plate (2) is installed on the chassis (1), so that the front coating opening (5) on the cover plate (2) that extends through the upper and lower surfaces of the cover plate (2) corresponds to any incomplete coating unit to be formed on the front cutting face (91) of the blade (9) to be coated. Then the chassis (1), cover plate (2) and blade (9) to be coated are sent into the physical coating furnace as a whole to prepare the incomplete coating on the front cutting face (91) and rear cutting face (92) of the blade (9) to be coated, i.e., the second coating (12).

2. The method for preparing multi-layer coated cemented carbide cutting tools according to claim 1, characterized in that: By employing multiple cover plates (2) with different front coating openings (5), the above step S2 is repeated to form a second coating (12) having multiple partially covered coating units.

3. The method for preparing multi-layer coated cemented carbide cutting tools according to claim 1, characterized in that: By using a cover plate (2) and changing the position of the front coating opening (5) on the cover plate (2) relative to the front cutting face (91) of the blade (9) to be coated, the above step S2 is repeated to form a second coating (12) having multiple incompletely covered coating units.

4. The method for preparing multi-layer coated cemented carbide cutting tools according to any one of claims 1 to 3, characterized in that: Before step S2, the cutting edge of the blade (9) to be coated after the first coating (11) is subjected to jet treatment using corundum particles with a particle size of 120-150 mesh and a jet time of 1-3 minutes; after step S2, the cutting edge of the blade (9) to be coated after the second coating (12) is subjected to jet treatment using corundum particles with a particle size of 120-150 mesh and a jet time of 1-3 minutes.

5. The method for preparing multi-layer coated cemented carbide cutting tools according to claim 2, characterized in that: The first coating (11) is a (Ti, Al)N and / or (Ti, Cr)N and / or (Ti, Si)N and / or (Ti, Zr)N coating.

6. The method for preparing multi-layer coated cemented carbide cutting tools according to claim 2, characterized in that: The second coating (12) is a (Ti, Al)N and / or (Ti, Cr)N and / or (Ti, Si)N and / or (Ti, Zr)N coating.

7. The method for preparing multi-layer coated cemented carbide cutting tools according to claim 3, characterized in that: The first coating (11) is a (Ti, Al, Cr)N and / or (Ti, Al, Zr)N and / or (Ti, Al, Si)N and / or (Ti, Al, Y)N coating.

8. The method for preparing multi-layer coated cemented carbide cutting tools according to claim 7, characterized in that: The second coating (12) is a (Ti, Al)N and / or (Ti, Cr)N and / or (Ti, Si)N and / or (Ti, Zr)N coating.

9. The method for preparing multi-layer coated cemented carbide cutting tools according to claim 7, characterized in that: The second coating (12) is a (Ti, Al)N and / or (Ti, Cr)N and / or (Ti, Si)N and / or (Ti, Zr)N coating.

10. A method for preparing multi-layer coated cemented carbide cutting tools, wherein the coating preparation apparatus includes a high-temperature coating furnace and a chassis (1) and a cover plate (2) that can be placed inside the high-temperature coating furnace, the high-temperature coating furnace can spray a stream of metal particles onto the surface of the cemented carbide cutting tool to form a cutting coating, the chassis (1) is plate-shaped and has a cavity (3) on its upper surface (10) for accommodating the cutting tool (9) to be coated, and a post-coating opening (4) extending through to the outer periphery of the chassis (1) is provided on the cavity side (31) of the cavity (3). The post-coating opening (4) corresponds at least to any partially covered coating unit to be formed on the back face (92) of the blade to be coated (9). The cover plate (2) can be placed on the front face (91) of the blade to be coated (9). The cover plate (2) has a pre-coating opening (5) that penetrates the upper and lower surfaces of the cover plate (2). The pre-coating opening (5) corresponds at least to any partially covered coating unit to be formed on the front face (91) of the blade to be coated (9). The method for preparing multi-layer coated cemented carbide cutting tools includes the following steps: S1: The blade (9) to be coated is installed into the cavity (3) of the chassis (1), so that the rear coating opening (4) on the cavity side (31) of the cavity (3) that extends to the outer periphery of the chassis (1) corresponds to any incomplete coating unit to be formed on the rear cutting face (92) of the blade (9) to be coated. The cover plate (2) is installed on the chassis (1), so that the front coating opening (5) on the cover plate (2) that extends through the upper and lower surfaces of the cover plate (2) corresponds to any incomplete coating unit to be formed on the front cutting face (91) of the blade (9) to be coated. Then the chassis (1), cover plate (2) and blade (9) to be coated are sent into the physical coating furnace as a whole to prepare the incomplete coating on the front cutting face (91) and rear cutting face (92) of the blade (9) to be coated, i.e., the first coating (11). S2: After placing the blade (9) to be coated, send it into the physical coating furnace to prepare the second coating (12) that completely covers the front face (91) and back face (92) of the blade (9).

11. The method for preparing multi-layer coated cemented carbide cutting tools according to claim 10, characterized in that: The first coating (11) is an Al2O3 and / or Ti(C,N) coating.

12. The method for preparing multi-layer coated cemented carbide cutting tools according to claim 11, characterized in that: The second coating (12) is a (Ti, Al)N and / or (Ti, Cr)N and / or (Ti, Si)N and / or (Ti, Zr)N coating.

13. The method for preparing multi-layer coated cemented carbide cutting tools according to claim 11, characterized in that: The second coating (12) is a (Ti, Al, Cr)N and / or (Ti, Al, Zr)N and / or (Ti, Al, Si)N and / or (Ti, Al, Y)N coating.

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