Cutter surface coating structure for difficult-to-machine materials

Abstract

The utility model discloses a cutter surface coating structure for difficult-to-machine materials, which comprises a cutter base body, a main functional layer and a surface layer, the main functional layer is arranged on the surface of the cutter base body, the surface layer is arranged on the outer side of the main functional layer, the main functional layer is an AlTiN coating, the surface layer is a ZrN coating, and the total thickness of the main functional layer and the surface layer is 1.5-3 microns; the coating is applied to the surface of an existing hard alloy cutter, the cutting performance of the cutter can be enhanced, the machining efficiency and surface machining quality of aeronautical parts are improved, and the problem that aeronautical materials are difficult to machine is solved.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the cutting tool surface coating technical field, concretely relates to a cutting tool surface coating structure for difficult-to-machine material. BACKGROUND

[0002] With the continuous progress of aviation material science, new aviation difficult-to-machine materials are emerging and the performance of materials is continuously improved, and machining is becoming more and more difficult. New aviation difficult-to-machine materials mainly include titanium alloy and high-temperature alloy. These materials are increasingly widely used in the aviation field, but the machining difficulty is large, and higher requirements are put forward for machining technology and process. Titanium alloy is widely used in the aviation field due to its high strength, low density and good corrosion resistance. However, the machining difficulty of titanium alloy is large, and the metal removal rate is only about 25% of ordinary steel or stainless steel, and the time for machining a titanium alloy workpiece is about 4 times that of machining a steel piece, which leads to a long manufacturing cycle of titanium alloy parts, and it is difficult to meet the needs of the rapid development of modern aviation industry. High-temperature alloy can still maintain excellent mechanical properties under high-temperature environment and is often used to manufacture key parts of aviation engine. Due to its high hardness, high toughness and other characteristics, micro-cracks and tool wear are easily generated during machining, increasing the machining difficulty. The above-mentioned various new aviation materials, ordinary cutting tools and commonly used tool coatings cannot avoid the above-mentioned defects during machining, therefore, a cutting tool with high cutting performance and wear resistance is urgently needed to solve the current situation of difficult machining of aviation materials. SUMMARY

[0003] In view of the above problems and technical needs, the utility model provides a cutting tool surface coating structure for difficult-to-machine materials. The coating is applied to the surface of the existing hard alloy cutting tool, which can enhance the cutting performance of the cutting tool, improve the machining efficiency and surface machining quality of aviation parts, and improve the problem of difficult machining of aviation materials.

[0004] The technical scheme of the utility model is as follows: a cutting tool surface coating structure for difficult-to-machine materials, comprising a cutting tool base body, a main functional layer and a surface layer, the cutting tool base body is provided with the main functional layer on the surface, the main functional layer is provided with the surface layer on the outer side, the main functional layer is an AlTiN coating, the surface layer is a ZrN coating, and the total thickness of the main functional layer and the surface layer is 1.5-3 microns.

[0005] Further, the thickness ratio of the main functional layer to the surface layer is 2:1-3:1.

[0006] Further, the thickness of the AlTiN coating on the surface of the cutting tool base body is not less than 1 micron.

[0007] Further, the thickness of the ZrN coating on the outer side of the AlTiN coating is not less than 0.375 microns.

[0008] Further, the cutter base is made of hard alloy material.

[0009] The utility model discloses beneficial effect:

[0010] 1) the coating combination in the cutter base is not set primer layer condition guaranteeed that the coating and cutter base good bonding force, simplified coating technology;

[0011] 2) AlTiN coating has highly oxidation resistance, has extensive application in the processing stainless steel etc. material, will it as main function layer, can make integral coating get effective support. In addition, in the high temperature cutting process, the Al element in coating can generate Al2O3, effectively prevents the further wear of coating, prolongs the coating life;

[0012] 3) the addition of ZrN coating makes the surface finish of cutter base improve, effectively reduces the sticking problem of cutter in the high temperature cutting process;In addition, ZrN coating exhibits lower cutting force and cutting temperature in the cutting process, is favorable to improve cutting efficiency and workpiece surface quality;Its light yellow appearance is more intuitive for observing cutter wear condition. BRIEF DESCRIPTION OF DRAWINGS

[0013] Figure 1 It is the layered schematic view of the cutter surface coating structure for difficult machining material of the utility model.

[0014] Marked as in the drawing: cutter base 1, AlTiN coating 2, ZrN coating 3. DETAILED DESCRIPTION

[0015] The utility model will be further described below in connection with the drawings and examples.

[0016] As Figure 1 The utility model discloses cutter surface coating structure for difficult machining material, including cutter base, main function layer and surface layer, cutter base surface is equipped with main function layer, main function layer outside is equipped with surface layer, wherein main function layer is AlTiN coating, surface layer is ZrN coating, the total thickness of main function layer and surface layer is 1.5-3mu.

[0017] The AlTiN coating has high oxidation resistance, and is widely applied in machining stainless steel and the like, and can effectively support the whole coating when used as a main functional layer. In addition, in high-temperature cutting, the Al element in the coating can generate Al2O3, effectively preventing further wear of the coating and prolonging the service life of the coating. The addition of the ZrN coating improves the surface finish of the tool substrate, effectively reducing the sticking problem of the tool in high-temperature cutting; in addition, the ZrN coating exhibits low cutting force and cutting temperature in cutting, which is beneficial to improving the cutting efficiency and the surface quality of the workpiece; and the light yellow appearance is more intuitive for observing the wear of the tool.

[0018] The thickness ratio of the main functional layer to the surface layer is 2:1-3:1. The thickness of the AlTiN coating on the surface of the tool substrate is not less than 1 μm, and the thickness of the ZrN coating outside the AlTiN coating is not less than 0.375 μm. The tool substrate is a cemented carbide material.

[0019] The machining process of the coating structure of the utility model:

[0020] Tool cleaning: clean the tool through the 9-slot cleaning line (spraying → ultrasonic wave → rough cleaning → rinsing → ultrasonic wave fine cleaning → rinsing → ultrasonic wave rinsing → pure water rinsing → water removal → drying); clamp the cleaned tool to the rotating frame to realize three-dimensional rotation and ensure the uniformity of the coating on the surface of the tool; load 3 groups of target materials (Ti target material, AlTi target material and Zr target material) into the coating furnace; push the rotating frame into the furnace, close the furnace door, and start the edited process program to run.

[0021] Vacuumizing and heating: vacuumize the gas pressure in the furnace to 4.0*10 -3 Pa, and after the vacuum reaches the preset value, turn on the heater in the coating furnace, and set the temperature to 450-500℃;

[0022] Gas etching: introduce Ar into the furnace, adjust the rotating frame speed to 2 r / min, turn on the tungsten filament, let Ar ionize to form a glow ion beam, maintain the temperature at 450-500℃, and let Ar + High-energy impact the surface of the tool to remove impurities remaining on the surface of the tool and ensure the cleanliness of the surface of the tool;

[0023] Metal etching: disconnect the tungsten filament power supply, maintain the temperature in the furnace at 450-500℃, adjust the rotating frame speed to 3 r / min, continue to introduce Ar, turn on the first group of Ti target material group, the current is 50-120A, the bias voltage is adjusted to -200--1000V, and the etching time is 10-30min;

[0024] Setting coating gas pressure: after etching, the Ar and the first group of Ti target group power is closed, the furnace temperature is kept at 450-500 DEG C, the rotating speed is adjusted to 3 r / min, appropriate N2 is introduced, and the furnace gas pressure is kept in the range of 2.0-5.0 Pa;

[0025] AlTiN main functional layer: after the furnace gas pressure is kept at the preset value, the second group of AlTi target group power is opened, the target current is 80-200 A, and the bias voltage is -70--100 V;

[0026] ZrN surface layer: the second group of AlTi target group power is closed, the furnace temperature is kept at 450-500 DEG C, the rotating speed is 3 r / min, the furnace gas pressure is kept in the range of 2.0-5.0 Pa, the third group of Zr target group power is opened, the target current is 80-200 A, and the bias voltage is adjusted to -70~-100 V;

[0027] Cooling: N2 is introduced into the furnace, the coating furnace cavity temperature is cooled to below 200 DEG C, then the furnace door is opened, and the tool is taken out after being continuously cooled to below 50 DEG C.

[0028] The above is only the preferred embodiments of the present application, but the protection scope of the present application is not limited to this, any skilled person in the art can easily think of the changes and replacements within the technical range disclosed by the present application, which should be covered in the protection scope of the present application. Therefore, the protection scope of the present application should be the protection scope of the claims.

Claims

1. A coating structure for tool surfaces made of difficult-to-machine materials, characterized in that: It includes a tool substrate, a main functional layer and a surface layer. The main functional layer is provided on the surface of the tool substrate, and the surface layer is provided on the outside of the main functional layer. The main functional layer is an AlTiN coating and the surface layer is a ZrN coating. The total thickness of the main functional layer and the surface layer is 1.5-3μm.

2. The tool surface coating structure for difficult-to-machine materials according to claim 1, characterized in that: The thickness ratio of the main functional layer to the surface layer ranges from 2:1 to 3:

1.

3. The tool surface coating structure for difficult-to-machine materials according to claim 1, characterized in that: The AlTiN coating has a thickness of not less than 1 μm on the tool substrate surface.

4. The tool surface coating structure for difficult-to-machine materials according to claim 1, characterized in that: The thickness of the ZrN coating on the outer side of the AlTiN coating is not less than 0.375 μm.

5. The tool surface coating structure for difficult-to-machine materials according to claim 1, characterized in that: The tool substrate is made of cemented carbide.

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