A self-contained microgroove surface textured tool and its design method

Abstract

This invention discloses a self-facilitating microgroove surface textured cutting tool and its design method. The tool's rake face has a shell-like microgroove texture in the chip-tool contact area. The microgroove texture is perpendicular to the main cutting edge, and the groove width gradually decreases towards the main cutting edge. The shell-like microgroove texture design method includes designing the center width of the microgroove texture based on surface wetting characteristics, designing the included angle and inclination angle of the microgroove texture based on internal self-facilitation characteristics, and designing the center spacing of the microgroove texture based on interfacial penetration characteristics. The insertion of this texture enhances liquid penetration, allowing the cutting fluid to effectively penetrate into the chip-tool contact area during liquid cutting, thus providing excellent friction reduction and lubrication.

Description

Technical Field

[0001] This invention belongs to the field of mechanical cutting tool technology, specifically relating to a self-feeding microgroove surface textured tool and its design method. Background Technology

[0002] During metal cutting, the intense friction between the tool and the chip leads to severe tool wear. Proper use of cutting fluid can reduce this friction, lower cutting forces and temperatures, and thus reduce tool wear. However, in traditional cutting processes, the close contact at the tool-chip interface makes it difficult for the cutting fluid to fully penetrate the contact area for cooling and lubrication of the tool tip, resulting in severe wear on the tool rake face. The addition of surface texture enhances the penetration of the cutting fluid, improving the friction and lubrication at the tool-chip interface and reducing tool friction and wear.

[0003] Chinese invention patent application number 201810660839.2 discloses a method for preparing a composite textured tool surface. This method prepares a composite textured tool by preparing a hydrophobic layer on the tool surface and combining it with laser processing technology, thereby regulating and improving the lubrication state of the cutting area.

[0004] Chinese invention patent application number 201910877959.6 discloses a gradient microtextured tool. The tool surface is provided with a circular pit microtextured array unit, which is composed of a series of circular pits with a gradient increase in depth. The invented microtextured tool solves the problem of wear debris accumulation in single-depth microtextured tools.

[0005] Chinese invention patent application number 201910412802.6 discloses a biomimetic texture and coating synergistic friction-reducing cutting tool and its design method. The tool has a composite texture of micro-dimples and micro-protrusions in the cutting-chip contact area on the front cutting face, and the texture surface has an AlZrTaC+TiVBN alternating nano-layer coating.

[0006] However, current surface textured cutting tools mainly rely on fabrication methods, and the design methods for texture geometry are relatively simple. There is a lack of comprehensive design of the texture from the perspective of lubricant penetration under liquid lubrication cutting conditions. Summary of the Invention

[0007] The purpose of this invention is to provide a self-contained microgroove surface textured tool and its design method that can solve the above-mentioned problems, enabling the cutting fluid to effectively penetrate into the tool-chip contact area during liquid cutting, thereby achieving good friction reduction and lubrication.

[0008] Technical solution: The self-feeding microgroove surface texture tool of the present invention is achieved through the following methods,

[0009] The tool rake face has a shell-like microgroove texture in the chip contact area. The microgroove texture is perpendicular to the main cutting edge, and the groove width gradually decreases towards the main cutting edge.

[0010] Furthermore, the shell-like microgroove texture design method includes the design of the center width of the microgroove texture based on surface wetting characteristics, the design of the included angle and tilt angle of the microgroove texture based on internal self-transportation characteristics, and the design of the center spacing of the microgroove texture based on interface penetration characteristics.

[0011] The design method for self-feeding microgroove surface textured tools includes the following steps.

[0012] S1. Design of the center width of microgroove texture based on surface wetting characteristics: Based on Fluent simulation software, a physical model of microfluidic impact on the microtexture surface with different cutting fluids is established. The dynamic behavior, internal velocity field and contact angle of the droplets when the microfluidic impacts the microgroove texture surface are analyzed. The center width of the microgroove texture is optimized using the minimum total work done in the wetting and spreading process and the maximum wettability as evaluation indicators. d ;

[0013] S2. Design of the included angle and tilt angle of the microgroove texture based on its internal self-transport characteristics: A simulation model of the self-transport of cutting fluid inside the microgroove texture is established using Comsol simulation software. The boundary conditions at both ends of the groove are set to atmospheric pressure. The fluid pressure, velocity distribution cloud map, and transport direction during the movement of the microfluidic droplets along the microgroove texture are analyzed. Analytical equations for the dimensionless energy and driving force inside the microtexture are established. Based on the contact angle results described in S1, the driving force and energy during the movement of the microfluidic droplets are solved. The included angle of the microgroove texture is optimized with the goal of maximizing the dimensionless energy difference and the driving force at both ends of the microgroove texture. θ and tilt angle β ;

[0014] S3. Design of center spacing of microgroove texture based on interfacial penetration characteristics: Based on Fluent simulation software, a cutting fluid fluid penetration model is established at the interface between the microgroove texture and the chip. The fluid inlet velocity boundary condition is the cutting fluid supply velocity. v 1 The outlet pressure boundary condition is atmospheric pressure. The optimization of the microgroove texture center spacing aims to maximize the cutting fluid penetration area ratio and the average dimensionless lubrication film pressure. a .

[0015] The beneficial effects of this invention are:

[0016] 1. The shell-like microgroove textured cutting tool provided by the present invention can enhance liquid penetration, optimize the lubrication performance of the tool-chip contact interface, and improve the tool's friction reduction and wear resistance.

[0017] 2. The design method provided by this invention theoretically optimizes the microgroove texture of the tool surface from the surface, interior and interface, providing important theoretical guidance for the preparation of textured tools;

[0018] 3. This tool aims to improve the penetration of cutting fluid at the tool-chip interface under liquid cutting conditions, which can effectively reduce the wear of the tool rake face and is widely used in cutting processes under different lubrication conditions such as water-based or oil-based lubrication. Attached Figure Description

[0019] Figure 1 This is a flowchart of the self-feeding microgroove surface texture tool design method in this invention;

[0020] Figure 2 This is a schematic diagram of the self-feeding microgroove surface textured tool structure in this invention;

[0021] Figure 3 This is a schematic diagram of the self-feeding microgroove structure of the self-feeding microgroove surface textured tool in this invention.

[0022] Wherein, 1-tool rake face, 2-microgroove texture, 3-main cutting edge, 4-center width of microgroove texture d 5-microgroove texture angle θ 6-Microgroove texture tilt angle β 7 microgroove texture center spacing a . Detailed Implementation

[0023] The present invention will now be described in detail with reference to the accompanying drawings:

[0024] Example 1:

[0025] A self-feeding microgroove surface textured tool, wherein the tool rake face has a shell-like microgroove texture in the chip contact area, the microgroove texture is perpendicular to the main cutting edge, and the groove width gradually decreases towards the main cutting edge.

[0026] The shell-like microgroove texture design method includes the design of the center width of the microgroove texture based on surface wetting characteristics, the design of the included angle and tilt angle of the microgroove texture based on internal self-transportation characteristics, and the design of the center spacing of the microgroove texture based on interface penetration characteristics.

[0027] like Figure 1 As shown, the self-feeding microgroove surface textured tool, the microgroove texture design method is as follows:

[0028] (1) Design of the center width of microgroove texture based on surface wetting characteristics: Based on Fluent simulation software, a physical model of oil-based cutting fluid microfluidic impact on the microtextured surface is established. The dynamic behavior, internal velocity field and contact angle of the droplet when the microfluidic impacts the microgroove textured surface are analyzed. The total work done in the minimum wetting and spreading process and the maximum wettability are used as the evaluation indicators, such as Figure 2-3 As shown, the center width of the microgroove texture is optimized. d It is 100 μm;

[0029] (2) Design of the included angle and tilt angle of the microgroove texture based on the internal self-transport characteristics: A simulation model of the self-transport of the cutting fluid inside the microgroove texture was established based on the Comsol simulation software. The boundary conditions at both ends of the groove were set to atmospheric pressure. The fluid pressure, velocity distribution cloud map and transport direction of the microfluidic droplets along the microgroove texture were analyzed. The analytical equations of dimensionless energy and driving force inside the microtexture were established. Based on the contact angle results in step (1), the driving force and energy of the microfluidic droplets during the movement process were solved. The included angle of the microgroove texture was optimized with the goal of maximizing the dimensionless energy difference and the driving force at both ends of the microgroove texture. θ For 20° and tilt angle β It is 15°;

[0030] (3) Design of center spacing of microgroove texture based on interfacial permeation characteristics: Based on Fluent simulation software, a cutting fluid permeation model of the interface between microtexture and chip is established, and the fluid inlet velocity boundary condition is the cutting fluid supply velocity. v 1 The outlet pressure boundary condition is atmospheric pressure. The optimization of the microgroove texture center spacing aims to maximize the cutting fluid penetration area ratio and the average dimensionless lubrication film pressure. a It is 250 μm.

[0031] Example 2:

[0032] A self-feeding microgroove surface textured tool, wherein the tool rake face has a shell-like microgroove texture in the chip contact area, the microgroove texture is perpendicular to the main cutting edge, and the groove width gradually decreases towards the main cutting edge.

[0033] The shell-like microgroove texture design method includes the design of the center width of the microgroove texture based on surface wetting characteristics, the design of the included angle and tilt angle of the microgroove texture based on internal self-transportation characteristics, and the design of the center spacing of the microgroove texture based on interface penetration characteristics.

[0034] like Figure 1 As shown, the self-feeding microgroove surface textured tool, the microgroove texture design method is as follows:

[0035] (1) Design of the center width of microgroove texture based on surface wetting characteristics: Based on Fluent simulation software, a physical model of water-based cutting fluid microfluidic impact on the microtexture surface is established. The dynamic behavior, internal velocity field and contact angle of the droplet when the microfluidic impacts the microgroove texture surface are analyzed. The total work done in the minimum wetting and spreading process and the maximum wettability are used as the evaluation indicators, such as Figure 2-3 As shown, the center width of the microgroove texture is optimized. d It is 50 μm;

[0036] (2) Design of the included angle and tilt angle of the microgroove texture based on the internal self-transport characteristics: A simulation model of the self-transport of the cutting fluid inside the microgroove texture was established based on the Comsol simulation software. The boundary conditions at both ends of the groove were set to atmospheric pressure. The fluid pressure, velocity distribution cloud map and transport direction of the microfluidic droplets along the microgroove texture were analyzed. The analytical equations of dimensionless energy and driving force inside the microtexture were established. Based on the contact angle results in step (1), the driving force and energy of the microfluidic droplets during the movement process were solved. The included angle of the microgroove texture was optimized with the goal of maximizing the dimensionless energy difference and the driving force at both ends of the microgroove texture. θ For 15° and tilt angle β It is 10°;

[0037] (3) Design of center spacing of microgroove texture based on interfacial permeation characteristics: Based on Fluent simulation software, a cutting fluid permeation model of the interface between microtexture and chip is established, and the fluid inlet velocity boundary condition is the cutting fluid supply velocity. v 1 The outlet pressure boundary condition is atmospheric pressure. The optimization of the microgroove texture center spacing aims to maximize the cutting fluid penetration area ratio and the average dimensionless lubrication film pressure. a It is 100 μm.

[0038] The above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit them. Those skilled in the art should understand that modifications can be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A self-contained microgroove surface textured tool, characterized in that: The rake face of the cutting tool has a shell-like microgroove texture in the chip contact area. The microgroove texture is perpendicular to the main cutting edge, and the groove width gradually decreases towards the main cutting edge. The design method for the simulated seashell microgroove texture includes: S1. Design of center width of microgroove texture based on surface wetting characteristics: Based on Fluent simulation software, a physical model of microfluidic impact of different cutting fluids on the surface of microtexture is established. The dynamic behavior, internal velocity field and contact angle of the droplet when the microfluidic impacts the surface of the microgroove texture are analyzed. The center width d of the microgroove texture is optimized by taking the total work done in the minimum wetting and spreading process and the maximum wettability as the evaluation index. S2. Design of the included angle and tilt angle of the microgroove texture based on its internal self-transport characteristics: A simulation model of the self-transport of the cutting fluid inside the microgroove texture is established based on Comsol simulation software. The boundary conditions at both ends of the groove are set to atmospheric pressure. The fluid pressure, velocity distribution cloud map and transport direction of the microfluidic droplets along the microgroove texture are analyzed. The analytical equations of dimensionless energy and driving force inside the microtexture are established. Based on the contact angle results mentioned in S1, the driving force and energy of the microfluidic droplets during their movement are solved. The included angle θ and tilt angle β of the microgroove texture are optimized with the goal of maximizing the dimensionless energy difference and driving force at both ends of the microgroove texture. S3. Design of center spacing of microgroove texture based on interface penetration characteristics: Based on Fluent simulation software, a cutting fluid fluid penetration model of the interface between microgroove texture and chip is established. The fluid inlet velocity boundary condition is the cutting fluid supply velocity v1, and the outlet pressure boundary condition is atmospheric pressure. The center spacing a of microgroove texture is optimized with the objectives of maximizing the cutting fluid penetration area ratio and maximizing the average dimensionless lubricating film pressure.

2. The self-feeding microgroove surface textured tool according to claim 1, characterized in that: The center width d of the microgroove texture is 100 μm, the included angle θ of the microgroove texture is 20°, the inclination angle β of the microgroove texture is 15°, and the center spacing a of the microgroove texture is 250 μm.

3. A design method for a self-contained microgroove surface textured tool, characterized in that, Includes the following steps, S1. Design of center width of microgroove texture based on surface wetting characteristics: Based on Fluent simulation software, a physical model of microfluidic impact of different cutting fluids on the surface of microtexture is established. The dynamic behavior, internal velocity field and contact angle of the droplet when the microfluidic impacts the surface of the microgroove texture are analyzed. The center width d of the microgroove texture is optimized by taking the minimum total work done in the wetting and spreading process and the maximum wettability as the evaluation index. S2. Design of the included angle and tilt angle of the microgroove texture based on its internal self-transport characteristics: A simulation model of the self-transport of the cutting fluid inside the microgroove texture is established based on Comsol simulation software. The boundary conditions at both ends of the groove are set to atmospheric pressure. The fluid pressure, velocity distribution cloud map and transport direction of the microfluidic droplets along the microgroove texture are analyzed. The analytical equations of dimensionless energy and driving force inside the microtexture are established. Based on the contact angle results described in S1, the driving force and energy of the microfluidic droplets during their movement are solved. The included angle θ and tilt angle β of the microgroove texture are optimized with the goal of maximizing the dimensionless energy difference and driving force at both ends of the microgroove texture. S3. Design of center spacing of microgroove texture based on interface penetration characteristics: Based on Fluent simulation software, a cutting fluid fluid penetration model of the interface between microgroove texture and chip is established. The fluid inlet velocity boundary condition is the cutting fluid supply velocity v1, and the outlet pressure boundary condition is atmospheric pressure. The center spacing a of microgroove texture is optimized with the objectives of maximizing the cutting fluid penetration area ratio and maximizing the average dimensionless lubricating film pressure.

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