A method for in-situ laser path compensation for machining curved surfaces based on tool back face structure and a laser-assisted cutting tool

Abstract

The application provides a curved surface machining in-situ laser path compensation method based on a tool rear end surface structure and a laser-assisted cutting tool, and relates to the field of ultra-precision special machining, wherein the method comprises the following steps: firstly, measuring the geometric size of a guide light diamond grain blank; secondly, determining the rear end surface arc radius of the diamond grain according to the established function relationship between the rear end surface arc radius of the grain and the grain width; then, according to the position relationship between the farthest incident point of the laser beam on the rear end surface of the grain and the farthest emission point of the laser beam on the tool tip arc, substituting the required tool tip arc radius, calculating the cutting edge length, and ensuring that the laser beam can be emitted at each position of the tool tip arc; finally, through the established function relationship between the displacement value of the laser beam incident point and the displacement value of the laser beam emission point, the accurate control of the focusing position of the laser beam on the tool tip arc is realized.

Description

Technical Field

[0001] This invention belongs to the field of ultra-precision special machining, and more specifically, it relates to a novel laser micro-cutting optical path design, and particularly to an in-situ laser path compensation method for curved surface machining based on the tool rear end face structure and a laser-assisted cutting tool. Background Technology

[0002] With the continuous development of science and technology, many hard, brittle, and difficult-to-machine materials, such as single-crystal silicon, silicon carbide, and optical glass, are widely used in aerospace, space optics, and other fields due to their excellent service performance. Single-point diamond turning, utilizing its extremely sharp single-crystal diamond tool for micro-cutting, can achieve extremely high shape accuracy and surface quality, and has been widely used in the machining of hard, brittle, and difficult-to-machine materials. However, when machining such materials, problems such as severe tool wear and poor surface finish often exist, seriously affecting the normal progress of ultra-precision machining processes.

[0003] Laser-assisted machining (LAM) technology focuses a high-energy laser beam onto the workpiece's cutting area, raising the temperature of the cutting zone to an appropriate value, reducing material hardness, increasing its cutting deformation capacity, and decreasing cutting force, thereby achieving better machinability. Currently, traditional LAM generally suffers from excessively large distances between the laser spot and the tool. To maintain the cutting zone temperature, high-power lasers are required, resulting in high energy consumption. Furthermore, high-power laser spots are prone to generating large stress fields, leading to surface damage in brittle materials. The influence of the cutting fluid on the laser beam path also increases the uncertainty of the laser focusing position. Therefore, in-situ laser-assisted turning devices have been designed to avoid these problems. The in-situ laser-assisted turning device is specifically described in the invention patents "An Ultrasonic Vibration In-situ Laser-Assisted Composite Single-Point Diamond Cutting System" (CN 111069767 B), "An In-situ Laser-Assisted Machining System for Optical Hard and Brittle Materials and Its Usage Method" (CN 108818983 A), and "An Ultrasonic Vibration In-situ Laser-Assisted Composite Single-Point Diamond Cutting System" (CN 111069767 A): The laser passes through the inside of the diamond cutting tool and is incident on the cutting tip, and then exits into the material in a very small area at the cutting tip to achieve heating.

[0004] Existing invention patents focusing on laser path design primarily concentrate on the vertical direction, such as the invention patents "In-situ Laser-Assisted Machining System and Method of Using Optical Hard and Brittle Materials" (CN 108818983 A) and "A Laser-Assisted Cutting Tool" (CN 114799933 A). When the laser beam propagates within the diamond cutting tool, it can only exit from the center of the tool tip arc. This dictates that the tool contact point in in-situ laser-assisted cutting is limited to the very center of the diamond tool, making it difficult to utilize most of the cutting edge area and significantly limiting tool life. Furthermore, in the variable-point machining of free-form surfaces, the cutting position of the tool is not always at the center of the tool tip arc. This type of machining results in a misalignment between the tool contact point and the laser beam's irradiation position. The laser beam cannot effectively heat and soften all cutting areas, leading to severe tool wear and poor surface quality and shape accuracy, severely limiting the application of in-situ laser-assisted cutting.

[0005] Therefore, how to redesign the propagation path of the laser beam inside the diamond tool, while ensuring the laser-assisted effect, to achieve adjustable laser exit point and realize in-situ laser-assisted cutting at the tool contact point is an urgent problem to be solved. Summary of the Invention

[0006] To address the shortcomings of existing technologies, this invention provides an in-situ laser path compensation method for curved surface machining based on the tool's rear end face structure, as well as a laser-assisted cutting tool. It establishes functional relationships between the radius of the rear end face arc and the tool width, the laser beam incident angle and the exit angle from the tool tip arc, and the laser beam displacement value and the tool rotation angle. This guides the grinding of diamond tool blanks of different sizes and enables precise control of the laser beam's focusing position on the tool tip arc. Using this method and tool avoids the problem that the laser beam can only exit from the center of the tool tip arc, effectively improving the service life of the laser-assisted tool and enhancing the surface quality of the machined surface.

[0007] Unlike the invention patent "Laser-Assisted Surface Machining Method and Device Combining Laser Adjustment and Path Compensation" (CN113885435 A), which requires cumbersome calculations and a precise laser head rotation device (piezoelectric ceramic), this invention can achieve laser emission point adjustment through only a tiny translational movement. Specifically, it establishes the functional relationship between the radius of the arc of the rear end face of the cutting tool and the width of the cutting tool, the relationship between the incident angle of the laser beam and the emission angle from the cutting tip arc, and the functional relationship between the laser beam displacement value and the tool rotation angle. This guides the grinding of diamond cutting tool blanks of different sizes and achieves precise control of the laser beam focusing position on the cutting tip arc. Using this method avoids the problem that the laser beam can only be emitted from the center position of the cutting tip arc.

[0008] The technical means employed in this invention are as follows: This invention provides an in-situ laser path compensation method for curved surface machining based on the rear end face structure of a cutting tool. The laser beam enters the interior of the diamond cutting tool from the rear end face of the cutting tool, exits from the arc of the cutting tool tip, and is focused on the workpiece to modify the material, improve cutting conditions, and enhance the surface quality. The in-situ laser path compensation referred to in this invention means that the exit point is compensated solely by adjusting the laser incident point without moving the cutting tool.

[0009] Includes the following steps: S1. Measure the geometric dimensions of the light-guiding diamond cutting tool blank; S2. Based on the established functional relationship between the radius of the rear end face of the diamond tool and the width of the tool, determine the radius of the rear end face of the diamond tool; then, based on the positional relationship between the farthest incident point of the laser beam on the rear end face of the tool and the farthest exit point on the tip arc, substitute the required tip arc radius to calculate the cutting edge length, ensuring that the laser beam can exit at various positions on the tip arc. S3. By establishing a functional relationship between the incident point displacement value and the exit point displacement value of the laser beam, precise control of the laser beam at the focusing position of the blade tip arc can be achieved.

[0010] In S2, the established functional relationship between the radius of the rear end face of the diamond tool bit and the width of the bit satisfies the following equation:

[0011] in, The radius of the arc at the rear end face of the blade is _____. The width of the diamond cutting tool. The incident angle of the laser beam at the rear end face of the blade is denoted as .

[0012] Furthermore, based on the positional relationship between the farthest incident point of the laser beam on the rear end face of the cutting edge and the farthest exit point on the cutting edge arc, the farthest distance of the laser beam exiting the cutting edge arc is calculated. ;

[0013] in, This represents the farthest distance the laser beam travels as it exits the arc at the tip of the blade. The exit angle of the laser beam at the rear end face of the blade is denoted as . The radius of the blade tip arc; By substituting the required tip radius r into the formula, and based on the determined angle parameters and the rear end radius, the maximum distance the laser beam can travel from the tip radius can be calculated. .

[0014] Furthermore, considering the geometry and size of the diamond cutting tool, by establishing a functional relationship between the incident point displacement value y and the exit point displacement value x of the laser beam, the displacement value at the exit point of the laser beam is calculated based on the incident point displacement value, ensuring that the laser beam remains focused on the workpiece surface to be processed after the laser beam displacement is adjusted.

[0015] Furthermore, the established functional relationship between the laser beam displacement and the tool rotation angle satisfies the following equation:

[0016] in, Let be the displacement value of the laser beam exit point at the blade tip arc, satisfying y is the displacement of the laser beam incident point at the rear end face of the blade, and θ2 is the refraction angle of the laser beam at the rear end face of the blade.

[0017] Furthermore, the radius of the diamond tool tip arc is 100~200μm.

[0018] This invention also provides a novel laser-assisted cutting tool. The main body of the light-guiding diamond cutting bit includes a rake face, a flank face, a cutting tip arc formed by the rake face and the flank face, a left front side and a right front side adjacent to the rake face and the flank face, a left side and a right side adjacent to the left front side and the right front side, respectively, and a rear end face adjacent to the left side and the right side. The laser beam is incident from the rear end face, reflected by the left front side or the right front side, refracted from the cutting tip arc, and focused onto the workpiece surface, thereby modifying the material and improving cutting conditions.

[0019] The rake face angle is a negative rake angle.

[0020] The cutting edge of the light-guiding diamond cutting tool is ground to ensure its arc radius r. When the laser beam is transmitted from inside the light-guiding diamond cutting tool to the arc of the cutting tip, the incident angle θ3 of the laser beam at the blunt circle of the cutting tip is less than the critical angle θ0, so that the laser beam can be emitted to the surface of the workpiece.

[0021] The rear end face can be designed as a cylinder or a cone, provided that the refraction conditions are guaranteed.

[0022] The light-guiding diamond cutting tool described in this invention is made of a hard, laser-transmitting material, most commonly diamond, but not limited to diamond. Materials with high light transmittance can be selected according to different wavelengths of laser light.

[0023] Furthermore, the cutting inserts of the new laser-assisted cutting tool can be fixed to the blade by welding or other fixing methods, and the blade can be connected and fixed to the tool body by set screws or other connection methods, providing sufficient rigidity and strength support to ensure smooth operation of the cutting process.

[0024] Unlike existing technologies [CN 108818983 A] and [CN 111069767 A], which focus on the optical path design along the longitudinal direction of the cutting tool, this invention places greater emphasis on the arrangement of the laser optical path around the cutting edge (i.e., in the transverse direction). This allows the laser beam exit position to no longer be limited to the center of the cutting tool, but can exit from multiple positions along the cutting edge, achieving in-situ laser-assisted cutting at the tool contact point.

[0025] Compared with the prior art, the present invention has the following advantages: (1) The laser optical path design provided by the present invention changes the shape of the rear end face of the blade, thereby changing the incident angle of the laser beam at the blade tip arc, so that the laser beam can be emitted from any position of the blade tip arc.

[0026] (2) The present invention establishes the relationship between the length of the cutting tool, the radius of the rear end face arc, the laser beam emission angle, and the tool rotation angle. In actual processing, the displacement distance of the laser beam can be precisely controlled according to the tool rotation angle, avoiding the problem of poor focusing effect caused by inaccurate laser beam displacement, ensuring that the laser beam can irradiate the surface to be processed, improving the laser-assisted effect, and improving the quality of the processed surface.

[0027] (3) The present invention makes little change to the blade structure. The rear end face radius and cutting edge length can be freely selected according to the width of the blade blank and the required cutting edge radius. The workload during tool preparation is small. Only the shape of the tool in the horizontal direction is designed. The front and rear angles of the tool can be flexibly designed. The tool design can be adjusted according to the actual working conditions. Attached Figure Description

[0028] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0029] Figure 1 This is a schematic diagram of the tool structure and optical path transmission principle in a preferred embodiment of the present invention.

[0030] Figure 2 This is a schematic diagram of the three-dimensional structure of the light-guiding diamond cutting tool in a preferred embodiment of the present invention.

[0031] Figure 3 The geometric dimensions of the light-guiding diamond cutting tool in a preferred embodiment of the present invention are shown.

[0032] Figure 4 This is a schematic diagram of the internal optical path transmission of the light-guiding diamond cutting tool in a preferred embodiment of the present invention.

[0033] In the diagram: 1 is the workpiece, 2 is the light-guiding diamond cutting tool, 3 is the laser beam, 11 is the front face, 12 is the tip arc, 13 is the back face, 14 is the right front side, 15 is the left front side, 16 is the right side, 17 is the left side, and 18 is the rear face. Detailed Implementation

[0034] It should be noted that, unless otherwise specified, the embodiments and features described in the present invention can be combined with each other. The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0035] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit the present invention or its application or use. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0036] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the scope of exemplary embodiments according to the invention. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0037] Unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps described in these embodiments do not limit the scope of the invention. It should also be understood that, for ease of description, the dimensions of the various parts shown in the drawings are not drawn to actual scale. Techniques, methods, and devices known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and devices should be considered part of the specification. In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters in the following figures denote similar items; therefore, once an item is defined in one figure, it need not be further discussed in subsequent figures.

[0038] In the description of this invention, it should be understood that the orientation or positional relationship indicated by directional terms such as "front, back, up, down, left, right", "horizontal, vertical, horizontal" and "top, bottom" is generally based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing this invention and simplifying the description. Unless otherwise stated, these directional terms do not indicate or imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on the scope of protection of this invention. The directional terms "inner" and "outer" refer to the inner and outer contours relative to the outline of each component itself.

[0039] For ease of description, spatial relative terms such as "above," "over," "on the upper surface of," "above," etc., are used herein to describe the spatial positional relationship of a device or feature as shown in the figures to other devices or features. It should be understood that spatial relative terms are intended to encompass different orientations in use or operation besides the orientation of the device as described in the figures. For example, if the device in the figures is inverted, a device described as "above" or "above" other devices or structures would subsequently be positioned as "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below." The device may also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used herein will be interpreted accordingly.

[0040] Furthermore, it should be noted that the use of terms such as "first" and "second" to define components is merely for the purpose of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore should not be construed as limiting the scope of protection of this invention.

[0041] Figure 1 This is a schematic diagram of the tool structure and optical path transmission principle in a preferred embodiment of the present invention, including a workpiece 1, a cutting edge 2, and a laser beam 3. The cutting edge 2 has a special structure, including: a front face 11, a rear face 13, a tip arc 12 formed by the front face 11 and the rear face 13, a left front side 15 and a right front side 14 adjacent to the front and rear faces, a left side 17 and a right side 16 adjacent to the left and right front sides respectively, and a rear end face 18 adjacent to the left and right sides. The laser beam enters from the rear end face 18, passes through the interior of the cutting edge 2, and exits from the tip arc 12 of the front face 11, ultimately focusing on the cutting area of ​​the workpiece 1 to soften it.

[0042] In this preferred embodiment, the cutting edge 2 is made of a hard, laser-transmitting material, typically single-crystal diamond, but not limited to this material. The angle of the rake face 11 is the tool rake angle; due to the machining of hard, brittle, and difficult-to-machine materials, the rake angle is generally a negative value. The arc formed by the rake face and the flank face is the tool tip arc 12, with a radius of 140 μm. The rear end face 18 is cylindrical.

[0043] The laser beam is a continuous laser with a wavelength of 1064 nm and a spot diameter of 50 nm. With a diameter of 100μm, it can meet the characteristics and requirements of most difficult-to-machine materials. The refractive index of diamond material in cutting tool 2 for a 1064nm laser is 2.392, while the refractive index of air is 1.

[0044] According to Snell's law of refraction, when a light wave propagates from one medium to another with a different refractive index, refraction occurs, and the critical angle is: =24.71° in, The critical angle at which the laser beam undergoes full emission. Let be the refractive index of air for the laser beam. denoted as , where is the refractive index of the diamond cutting tool against the laser beam.

[0045] The laser beam is incident perpendicularly from the rear end face 18 of the blade, forming an incident angle with the cylindrical surface. After being refracted by the rear end face, it enters the interior of the blade 2, and its refraction angle is... .

[0046]

[0047] Establish a functional relationship between the width d of the diamond cutting tool and the radius R of the cutting tool's rear end face to ensure that the laser beam can undergo total internal reflection when passing through the rear end face 18 of the cutting tool after grinding.

[0048] According to the triangular relationship,

[0049] Where, when the angle of incidence Less than the critical angle At this time, when the laser beam is incident from the rear end face 18 of the blade, total internal reflection will not occur, and it can be incident into the interior of the blade 2.

[0050] Based on the positional relationship between the farthest incident point of the laser beam on the rear end face of the cutting edge and the farthest exit point on the cutting edge arc, the farthest distance of the laser beam exiting the cutting edge arc can be calculated by appropriately setting the radius r of the cutting edge arc. That is, half the length of the cutting edge, to ensure that the laser beam can be refracted onto the tip arc 12 from any position on the rear end face of the cutting edge.

[0051] The relationship between the positions of the laser beam at the farthest incident point on the rear end face of the cutting edge and the farthest exit point on the cutting edge arc is as follows:

[0052] in, This represents the farthest distance the laser beam travels as it exits the arc at the tip of the blade. The laser beam exits at an angle of 18° at the rear end face of the blade. The radius of the blade tip arc is 12.

[0053] Because the refractive index of the diamond cutting tool on the laser beam is greater than that of air on the laser beam, total internal reflection will not occur, and the laser beam can be emitted from inside the cutting tool onto the workpiece.

[0054] The established functional relationship between the incident point displacement and the exit point displacement of the laser beam satisfies the following equation:

[0055] in, Let be the displacement value of the laser beam exit point at the 12-degree arc of the blade tip, satisfying y is the displacement of the laser beam at the incident point at the rear end face 18 of the blade, and θ2 is the refraction angle of the laser beam at the rear end face 18 of the blade.

[0056] The laser optical path design in this invention includes the following steps during the processing: First, the geometric dimensions of the light-guiding diamond cutting tool blank are measured. Based on the established functional relationship between the tool width and the radius of the tool's rear end face, the required arc radius of the tool's rear end face is calculated. Second, based on the established positional relationship between the farthest incident point of the laser beam on the tool's rear end face and the farthest exit point on the tool tip arc, the required tool tip arc radius is substituted to determine the cutting edge length of the diamond tool, ensuring that the laser beam can be transmitted from the tool's rear end face to the tool tip arc. When the cutting contact point needs to be adjusted during the cutting process, the exit position of the laser beam on the tool tip arc can be changed by horizontally moving the laser beam, thereby changing the cutting contact point and using a new cutting edge. Then, based on the established functional relationship between the laser beam incident point displacement value y and the laser beam exit point displacement value x, the distance that the laser beam needs to move to use the new cutting edge is determined. Finally, by moving the laser beam, the laser beam is refocused on the new cutting contact point without moving the tool to modify the material, realizing in-situ laser-assisted cutting of free-form surfaces of hard and brittle materials.

[0057] This invention alters the laser beam's propagation path within the cutting tool, changing its focusing position on the tool tip arc by horizontally shifting the beam. This ensures the laser beam can exit from every point on the tool tip arc, enabling variable-point machining in in-situ laser-assisted cutting. This expands the application range of in-situ laser-assisted cutting and improves the utilization rate of cutting edges in ultrasonic-assisted cutting. Furthermore, it extends tool life and improves surface quality in laser-assisted cutting, even under conditions of severe tool wear.

[0058] This invention is based on the tool's rear end face structure. It uses a fixed optical path from the rear end face incident to the tool tip arc exit. The exit point is controlled by translating the incident point, eliminating the need for tool rotation and avoiding tool vibration interference. The short optical path from the rear end face to the tool tip results in energy loss ≤5%. This invention only requires horizontal translation of the laser incident point, accurately mapping the exit point position through functional relationships. No additional driving components are needed, reducing costs and ensuring an adjustment response time ≤50ms. This invention directly uses three sets of functional relationships—rear end face arc radius - tool width, incident-exit point position, and incident-exit displacement—for compensation, directly relating to tool geometry parameters. The compensation accuracy is ±0.2μm, without relying on additional machine tool compensation algorithms, resulting in stronger compatibility.

[0059] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A method for in-situ laser path compensation in curved surface machining based on the rear end face structure of a cutting tool, characterized in that: The laser beam enters the interior of the diamond tool insert from the rear end face (18) and exits from the tool tip arc (12), focusing on the workpiece to modify the material, including the following steps: S1. Measure the geometric dimensions of the light-guiding diamond cutting tool blank; S2. Based on the established functional relationship between the radius of the rear end face of the diamond tool and the width of the tool, determine the radius of the rear end face of the diamond tool; then, based on the positional relationship between the farthest incident point of the laser beam on the rear end face of the tool and the farthest exit point on the tip arc, substitute the required tip arc radius to calculate the cutting edge length, ensuring that the laser beam can exit at various positions on the tip arc. S3. By establishing the functional relationship between the displacement value of the laser beam incident point and the displacement value of the laser beam exit point, precise control of the laser beam at the focusing position of the blade tip arc can be achieved. In S2, the established functional relationship between the radius of the rear end face of the diamond tool bit and the width of the bit satisfies the following equation: in, The radius of the arc of the rear end face (18) of the blade is given. The width of the diamond cutting tool. The incident angle of the laser beam at the rear end face (18) of the blade; Based on the positional relationship between the farthest incident point of the laser beam on the rear end face of the cutting tool and the farthest exit point on the cutting tool tip arc, the farthest distance of the laser beam exiting the cutting tool tip arc is calculated. ; in, This represents the farthest distance the laser beam travels as it exits the arc at the tip of the blade. Let be the exit angle of the laser beam at the rear end face (18) of the blade. The radius of the blade tip arc (12); By substituting the required tip radius r into the formula, and based on the determined angle parameters and the rear end radius, the maximum distance the laser beam can travel from the tip radius can be calculated. ; Considering the geometry and size of the diamond cutting tool, by establishing a functional relationship between the incident point displacement value y and the exit point displacement value x of the laser beam, the displacement value at the exit point of the laser beam is calculated based on the incident point displacement value, ensuring that the laser beam is still focused on the workpiece surface to be processed after the laser beam displacement is adjusted. The established functional relationship between the laser beam displacement and the tool rotation angle satisfies the following equation: in, Let be the displacement value of the laser beam exit point at the blade tip arc (12), satisfying y is the displacement value of the laser beam incident point at the rear end face (18) of the blade, and θ2 is the refraction angle of the laser beam at the rear end face (18) of the blade; The radius of the tip arc (12) of the diamond tool is 100~200μm.

2. A laser-assisted cutting tool designed based on the method of claim 1, characterized in that: The cutting tool (2) includes a front cutting face (11), a rear cutting face (13), a cutting tip arc (12) formed by the front cutting face (11) and the rear cutting face (13), a left front side (15) and a right front side (14) adjacent to the front and rear cutting faces, a left side (17) and a right side (16) adjacent to the left front side and the right front side respectively, and a rear end face (18) adjacent to the left side and the right side.

3. A laser-assisted cutting tool according to claim 2, characterized in that: The blade (2) is made of light-guiding diamond material.

4. A laser-assisted cutting tool according to claim 2, characterized in that: The angle of the rake face (11) is a negative rake angle.

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