阅读说明：本技术 一种微纳织构涂层的制备方法 (Preparation method of micro-nano texture coating ) 是由 颜安 陈汪林 江信榕 王成勇 李炳新 于 2019-09-12 设计创作，主要内容包括：本发明提供一种微纳织构涂层的制备方法。一种微纳织构涂层的制备方法,将待加工工件用底座水平的夹具夹紧,保证待加工面朝上,将待加工面放在飞秒激光器下,调整激光辅助光源,使辅助激光光源对准待加工区域,设置激光加工参数,开启飞秒激光器加工出微纳织构,然后具有微纳织构的工件放入硬质膜镀膜机,在微纳织构上沉积涂层,制备出具有微纳织构涂层的工件。本发明通过控制飞秒激光器的加工参数,实现在刀具刃口上制备微纳织构,该微纳织构能够与涂层具有好的结合力,从而提高刀具寿命和减少刀具磨损。(The invention provides a preparation method of a micro-nano texture coating. A preparation method of a micro-nano texture coating comprises the steps of clamping a workpiece to be processed by a clamp with a horizontal base, ensuring that the surface to be processed faces upwards, placing the surface to be processed under a femtosecond laser, adjusting a laser auxiliary light source to enable the auxiliary laser light source to be aligned to a region to be processed, setting laser processing parameters, starting the femtosecond laser to process a micro-nano texture, then placing the workpiece with the micro-nano texture into a hard film coating machine, and depositing a coating on the micro-nano texture to prepare the workpiece with the micro-nano texture coating. According to the invention, the micro-nano texture is prepared on the cutting edge of the cutter by controlling the processing parameters of the femtosecond laser, and the micro-nano texture can have good binding force with the coating, so that the service life of the cutter is prolonged and the abrasion of the cutter is reduced.)

1. A preparation method of a micro-nano texture coating is characterized by comprising the following steps: comprises the following steps of (a) carrying out,

firstly, clamping a workpiece to be processed by a clamp with a horizontal base to ensure that the surface to be processed is upward,

secondly, placing the surface to be processed under a femtosecond laser, adjusting a laser auxiliary light source to enable the auxiliary laser light source to be aligned to the area to be processed, setting laser processing parameters, starting the femtosecond laser to process micro-nano texture,

and thirdly, placing the workpiece with the micro-nano texture into a hard film coating machine, and depositing a coating on the micro-nano texture to prepare the workpiece with the micro-nano texture coating.

2. The preparation method of the micro-nano texture coating according to claim 1, which is characterized by comprising the following steps: in the processing process of the femtosecond laser, the micron-level texture is processed in the middle of the micron-level texture while the micron-level texture is formed in the area to be processed.

3. The preparation method of the micro-nano texture coating according to claim 1, which is characterized by comprising the following steps: the workpiece to be machined comprises a cutter or a hard alloy block.

4. The preparation method of the micro-nano texture coating according to claim 3, which is characterized by comprising the following steps: the area to be machined of the tool is a contact surface with chips on the cutting edge of the tool or a contact surface of the tool and a workpiece.

5. The preparation method of the micro-nano texture coating according to claim 2, which is characterized by comprising the following steps: the linear groove width of micron-level texture processing is 50um-100um, the groove depth is 0.5um-5um, and the groove interval is 100um-150 um.

6. The preparation method of the micro-nano texture coating according to claim 1, which is characterized by comprising the following steps: the pulse energy set by the femtosecond laser is 20uJ, the scanning speed is 20-100mm/s, and the frequency is 100 kHz.

7. The preparation method of the micro-nano texture coating according to claim 1, which is characterized by comprising the following steps: the femtosecond laser processes the cutter or the hard alloy for 1-5 times.

Technical Field

The invention relates to the technical field of femtosecond laser processing, in particular to a preparation method of a micro-nano texture coating.

Background

In the high-speed course of working of digit control machine tool, because the process velocity constantly improves, the process time is accumulated and is increased, the blade of cutter constantly contacts the friction with the friction pair, produces thermal accumulation, and partly heat can be taken away to the smear metal, and partly heat can transmit the blade department of sword in addition, and continuous accumulation, dry cutting temperature can reach more than 1000 ℃. Even if the cutting fluid is cooled and lubricated to reduce the temperature of the cutting edge of the cutter, the cutting fluid is difficult to flow into the cutting edge to directly and effectively reduce the temperature of the cutting edge of the cutter by a conventional pouring method because normal chips are in contact with the rake face; secondly, the installation mode of coolant liquid is also uneven, can not be effectual spout cutter blade department with the coolant liquid to cutter blade temperature is too high, and the cutter blade softens, continues to process the work piece at the back, leads to the cutter wearing and tearing to accelerate, leads to the cutter blade to break edge even, causes the bad influence to industrial production, causes very big economic loss.

In order to solve the problems of cutter abrasion and cutter edge tipping, the cutter is coated by the most widely and effectively applied method. Due to the excellent material properties of the coating, the coating is widely applied to various cutting tools at present and is used for improving the hardness, wear resistance and high temperature resistance of the tools, but the coated tools also have the limitations, and the coating is easy to peel off at the cutting edges of the tools and the cutting edges of the tools caused by the complex shapes of the tools, so that the coating fails, and even the wear of the tools is accelerated. In recent years, in the field of tribology research, it has been proposed that the smoother the surface material is, the better the wear resistance is, that a method of improving the surface characteristics of the material by changing the physical structure of the surface of the material, and that processing a lattice having a pattern of pits, dents, or convexities, etc., in a certain size and arrangement, on the surface of the material, is also an effective means of improving the surface tribological properties. The surface texture technology of the cutter is that micro-texture or nano-texture is added on the surface of the cutter to change the surface performance between the front cutter face or the rear cutter face of the cutter and a friction pair, reduce friction factors and reduce friction force, thereby reducing cutter abrasion. The existing coated cutter is processed with a micro-texture to improve the wear resistance of the cutter, but the continuity of the coating can be damaged due to the size of the micro-texture, the bonding force between the coating and the cutter substrate is poor, and the coating is easy to fall off.

Disclosure of Invention

The invention aims to overcome the defects that the existing microtexture and the coating have poor bonding force and the coating is easy to fall off, and provides a preparation method of a micro-nano textured coating. According to the invention, the micro-nano texture is prepared on the cutting edge of the cutter by controlling the processing parameters of the femtosecond laser, and the micro-nano texture can have good binding force with the coating, so that the service life of the cutter is prolonged and the abrasion of the cutter is reduced.

In order to solve the technical problems, the invention adopts the technical scheme that: a preparation method of a micro-nano texture coating comprises the following steps:

firstly, clamping a workpiece to be processed by a clamp with a horizontal base to ensure that the surface to be processed is upward,

secondly, placing the surface to be processed under a femtosecond laser, adjusting a laser auxiliary light source to enable the auxiliary laser light source to be aligned to the area to be processed, setting laser processing parameters, starting the femtosecond laser to process micro-nano texture,

and thirdly, placing the workpiece with the micro-nano texture into a hard film coating machine, and depositing a coating on the micro-nano texture to prepare the workpiece with the micro-nano texture coating.

Further, in the processing process of the femtosecond laser, a micron-level texture is processed in the middle of the micron-level texture while the micron-level texture is formed in the region to be processed. The workpiece to be machined comprises a cutter or a hard alloy block. The area to be machined of the tool is a contact surface with chips on the cutting edge of the tool or a contact surface of the tool and a workpiece. The micro-nano texture can be generated through one process of femtosecond laser, the nano texture is generated while the micron texture is generated, wherein no protrusion is arranged on the groove edge of the micron texture, and a small amount of oxygen exists in the nano texture, so that the peripheral oxide of the micron texture is little, the micro-nano texture is processed on and around the cutting edge of the cutter, the bonding area and the density of a coating and a substrate can be improved, the bonding force of the coating is improved, and the cutting edge of the cutter has excellent abrasion resistance.

Further, the linear groove width of micron-level texture processing is 50um-100um, the groove depth is 0.5um-5um, and the groove interval is 100um-150 um. The pulse energy set by the femtosecond laser is 20uJ, the scanning speed is 20-100mm/s, and the frequency is 100 kHz. The femtosecond laser processes the cutter or the hard alloy for 1-5 times. The pulse energy, frequency, scanning rate and processing times of the femtosecond laser are core process parameters, micro-nano textures can be processed by one femtosecond laser, and the continuity of the micro-nano textures on a substrate can be ensured after the femtosecond laser is processed for 1-5 times.

Compared with the prior art, the invention has the beneficial effects that:

according to the invention, by utilizing a femtosecond laser technology, appropriate femtosecond laser parameters are adjusted, and a micro-nano texture is obtained by processing, the micro-nano texture has good continuity and little thermal damage, no oxide appears on the edge of the micro-nano texture, so that the preparation of a coating is facilitated, the sub-surface area of the coating and a micro-nano texture substrate is improved, and the binding force of the coating and the micro-nano texture substrate is also improved; the micro-nano texture can also reduce stress concentration at the cutting edge of the cutter, and prevent the coating from falling off at the cutting edge of the cutter in the preparation process of the coating; by combining the coating and the micro-nano texture, the service life of the cutter is prolonged and the abrasion of the cutter is reduced.

Drawings

FIG. 1 is a scanning electron microscope image of micro-nano texture on cemented carbide.

Detailed Description

The present invention will be further described with reference to the following embodiments. Wherein the showings are for the purpose of illustration only and are shown by way of illustration only and not in actual form, and are not to be construed as limiting the present patent; to better illustrate the embodiments of the present invention, some parts of the drawings may be omitted, enlarged or reduced, and do not represent the size of an actual product; it will be understood by those skilled in the art that certain well-known structures in the drawings and descriptions thereof may be omitted.

The same or similar reference numerals in the drawings of the embodiments of the present invention correspond to the same or similar components; in the description of the present invention, it should be understood that if there is an orientation or positional relationship indicated by the terms "upper", "lower", "left", "right", etc. based on the orientation or positional relationship shown in the drawings, it is only for convenience of describing the present invention and simplifying the description, but it is not intended to indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and therefore, the terms describing the positional relationship in the drawings are only used for illustrative purposes and are not to be construed as limiting the present patent, and the specific meaning of the terms may be understood by those skilled in the art according to specific circumstances.