Laser-assisted milling spindle, laser control method therefor, and laser-assisted milling device

Abstract

The application discloses a laser-assisted milling spindle, a laser control method thereof and a laser-assisted milling device, and belongs to the technical field of milling processing. The milling spindle comprises a spindle body, a milling cutter bar and an optical fiber. The milling cutter bar and the spindle body are coaxially connected head to tail and can rotate by themselves. A laser passing hole is arranged in the spindle body. A cutter blade for milling operation is arranged at the bottom of the milling cutter bar. The optical fiber is arranged in the milling cutter bar, and a receiving end for receiving laser is arranged at the head of the milling cutter bar, and an irradiation end for irradiating a workpiece to be processed extends to the bottom of the milling cutter bar. The receiving end of the optical fiber is in communication with the laser passing hole, so as to form a light transmission path. The irradiation position of the laser conducted through the optical fiber is located on the action path of the cutter blade when the cutter blade rotates with the milling cutter bar. The application can perform timely milling after laser heating, has simple overall structure, high precision and good stability.

Description

Technical Field

[0001] This invention belongs to the field of milling technology, specifically relating to laser-assisted milling spindles, laser control methods, and laser-assisted milling devices. Background Technology

[0002] Laser irradiation of workpieces before machining processes such as milling, turning, and drilling can soften the machining surface, reduce cutting force, and thus improve machining results. Laser-assisted machining has become an important research direction in composite machining in recent years. However, due to the unique characteristics of laser and milling, there are difficulties in combining the two. Specifically, when the milling cutter is rotating, how can the laser accurately irradiate the front of the milling position?

[0003] In the prior art, such as the patent application number CN202310408178.9, an automatic adjustment and control method and system for laser-assisted milling spot pose is disclosed. The control method includes obtaining a tool position file by planning the tool path based on the characteristics of laser-assisted processing technology, and calculating the spatial pose of the laser spot under the actual tool path through the proposed laser attitude control algorithm, thereby obtaining a tool-laser synchronous CNC program that changes synchronously and in coordination with the processing tool path. This scheme solves the problem of laser and milling combination by controlling the spot pose, but the overall control is complex and cannot guarantee that milling can be performed in a timely manner after laser heating.

[0004] Timely milling after laser heating is currently a technical challenge in the industry. The main considerations are as follows: First, in terms of space, the laser irradiation point should be as close as possible to the milling cutting point, especially the cutting edge entry point, to avoid the laser assistance being weak or ineffective due to a large distance. Second, in terms of time, the interval between laser irradiation and milling cutter entry should be as short as possible to avoid the laser assistance being weak or ineffective due to a long time. Summary of the Invention

[0005] The purpose of this invention is to address the shortcomings of existing technologies by providing a laser-assisted milling spindle, its laser control method, and a laser-assisted milling device. This invention can simultaneously solve the problems of weak or no laser assistance caused by the distance between the laser irradiation point and the milling cutter entry position, as well as the long interval between laser irradiation and milling cutter entry.

[0006] This invention provides the following technical solution:

[0007] In a first aspect, a laser-assisted milling spindle is provided, comprising a spindle body, a milling cutter bar, and an optical fiber; the milling cutter bar and the spindle body are coaxially connected end to end and are capable of rotating about their own axis; a laser penetration hole is provided in the spindle body to accommodate the passage of a laser; a cutting blade for milling operation is installed at the bottom of the milling cutter bar; the optical fiber is installed inside the milling cutter bar, with the receiving end for receiving the laser located at the head of the milling cutter bar and the irradiation end for irradiating the workpiece extending to the bottom of the milling cutter bar; the receiving end of the optical fiber is correspondingly connected to the laser penetration hole to form a light transmission path; the irradiation position of the laser transmitted through the optical fiber is located on the movement path of the cutting edge when the cutting blade rotates with the milling cutter bar.

[0008] Optionally, there are multiple optical fibers, and the receiving ends of the multiple optical fibers surround the central axis of the milling cutter bar; the laser penetration holes correspond one-to-one with the receiving ends of the optical fibers; the irradiation ends of the optical fibers are located on the circumferential surface and / or end face of the milling cutter bar.

[0009] Optionally, when there are multiple irradiation ends of optical fibers on the end face of the milling cutter bar, the irradiation ends of all optical fibers extending to the end face of the milling cutter bar are arranged in a first straight line array, where the first straight line is the radius of the milling cutter bar.

[0010] When there are multiple irradiation ends of optical fibers on the circumferential surface of the milling cutter bar, the irradiation ends of all optical fibers extending to the circumferential surface of the milling cutter bar are arranged in a second straight line array, and the second straight line is perpendicular to the end face of the milling cutter bar.

[0011] Optionally, it also includes a laser emitting head, wherein a plurality of laser penetration holes are arranged in a ring around the axis of the main shaft body; the laser emitting head is directly facing a point in the distribution path of all the laser penetration holes; when the main shaft body rotates about its own axis, the laser emitting head and the laser penetration holes are sequentially opposite each other.

[0012] Optionally, the laser emitting head emits laser light in the form of square wave pulses, and the laser emission signal of the laser emitting head can be adjusted according to the use of optical fibers to adapt to the current milling conditions.

[0013] Optionally, the spindle body is rotatably connected to the spindle base plate, and the spindle base plate is provided with a plurality of arrayed mounting holes; the laser emitter head is detachably installed in some of the mounting holes of the spindle base plate.

[0014] Optionally, the spindle body is connected to the output shaft of the power motor via a synchronous belt drive assembly to drive the spindle body to rotate around its own axis; the power motor is mounted on the spindle base plate via a motor bracket.

[0015] A speed measuring wheel is installed at the end of the spindle body away from the milling cutter bar; a detection block is provided on the speed measuring wheel, and the spindle body is rotatably connected to the spindle base plate; a photoelectric sensor is also provided on the spindle base plate; the photoelectric sensor is used in conjunction with the detection block to detect the rotational speed of the spindle body.

[0016] In a second aspect, a laser control method for a laser-assisted milling spindle as described in any of the first aspects is provided, comprising the following steps:

[0017] The rotational speed ω of the spindle body is measured in real time to determine the laser emission period T;

[0018] Based on the number of laser-perforated holes i and the laser emission period T, the time interval t between two adjacent laser pulses in the original state is determined. r The original state refers to a state where all optical fibers are in use.

[0019] The pulse width t of a single laser pulse is determined based on the diameter D of the optical fiber and the distance L from the center of the optical fiber to the axis of the milling cutter. u ;

[0020] Depending on the location of the optical fiber used, skip the laser pulses corresponding to the location of the unused optical fiber, and retain the laser pulses corresponding to the used optical fiber;

[0021] Based on the position of the retained laser pulse and the time interval t between two adjacent laser pulses in the original state r Determine the time interval t between two adjacent retained laser pulses. d ;

[0022] Based on the delay time t0 from receiving the command to emitting the laser, and the pulse width t of a single laser pulse u and the time interval t between two adjacent retained laser pulses d To control the laser emission.

[0023] Optionally, the time interval t between two adjacent laser pulses in the original state r for:

[0024]

[0025] The pulse width t of the single laser pulse u for:

[0026]

[0027] Where ε is the loss prevention experience duration.

[0028] Thirdly, a laser-assisted milling apparatus is provided, comprising a worktable and a laser-assisted milling spindle as described in any one of the first aspects, wherein the worktable is used to place a workpiece to be processed and to move the workpiece to be processed in the X, Y and Z directions; the laser-assisted milling spindle is directly opposite the worktable and the two are used in conjunction.

[0029] Compared with the prior art, the beneficial effects of the present invention are:

[0030] (1) The laser-assisted milling spindle of the present invention sets the laser irradiation position on the rotation path of the cutting edge through optical fiber, which can solve the problem that the laser assistance is weak or ineffective due to the distance between the laser irradiation point and the milling cutter entry position and the long interval between laser irradiation and milling cutter entry. The overall structure is simple, with high precision and good stability, and is not affected by milling vibration, impact and blockage.

[0031] (2) The laser-assisted milling spindle of the present invention includes multiple optical fibers, and the irradiation ends of the multiple optical fibers extend to different positions. It can select some or all of the optical fibers for use according to the actual milling conditions. The overall adaptability is high and it is suitable for various milling conditions.

[0032] (3) The laser control method of the present invention uses real-time speed measurement data of the spindle body and the usage of optical fiber to adjust the emission signal of the laser emitter, thereby achieving precise and efficient control. Attached Figure Description

[0033] Figure 1 This is a schematic diagram of the overall structure of the laser-assisted milling spindle of the present invention;

[0034] Figure 2 This is an exploded structural diagram of the laser-assisted milling spindle of the present invention;

[0035] Figure 3 This is a schematic diagram of the milling cutter bar structure when there are four optical fibers;

[0036] Figure 4 This is a structural diagram showing the distribution of the irradiation ends of four optical fibers.

[0037] Figure 5 This is a schematic diagram showing the distribution of optical fibers when there are four optical fibers.

[0038] Figure 6 This is a schematic diagram of the internal structure of the milling cutter bar when there is one optical fiber during bottom milling.

[0039] Figure 7 This is a schematic diagram of the internal structure of the milling cutter bar when there is one optical fiber during side milling.

[0040] Figure 8 This is a schematic diagram of the milling cutter bar structure when there are two optical fibers; Figure 8 Image a is a schematic diagram of the structure of the irradiation end of the optical fiber when there are two optical fibers. Figure 8 b is a schematic diagram of the optical fiber receiving end when there are two optical fibers;

[0041] Figure 9 This is a schematic diagram of the milling cutter bar structure when there are six optical fibers; Figure 9 "a" is a schematic diagram of the structure of the irradiation end of the optical fiber when there are six optical fibers. Figure 9 b is a schematic diagram of the optical fiber receiving end when there are six optical fibers;

[0042] Figure 10 This is a laser waveform diagram when there are four optical fibers, all of which are selected for use.

[0043] Figure 11 This is a laser waveform diagram when there are four optical fibers and the second laser is not in use;

[0044] Figure 12 This is a flowchart illustrating the steps of a laser control method for a laser-assisted milling spindle according to the present invention.

[0045] The markings in the diagram are as follows: 1 is the main spindle body, 2 is the milling cutter bar, 21 is the focal positioning ring, 3 is the optical fiber, 4 is the cutting tool, 5 is the laser emitter, 6 is the main spindle base plate, 7 is the power motor, 71 is the motor bracket, 8 is the synchronous belt drive assembly, 9 is the speed measuring wheel, 10 is the detection block, and 11 is the photoelectric sensor. Detailed Implementation

[0046] The invention will now be described in further detail with reference to the accompanying drawings.

[0047] It should be noted that the terms such as "upper", "lower", "left", "right", "front", and "back" used in the invention are only for clarity of description and are not intended to limit the scope of the invention. Changes or adjustments to their relative relationships, without substantially altering the technical content, should also be considered within the scope of the invention.

[0048] Example 1

[0049] like Figure 1 and 2 As shown, a laser-assisted milling spindle includes a spindle body 1, a milling cutter 2, and an optical fiber 3. The milling cutter 2 and the spindle body 1 are coaxially connected end to end and can rotate around their own axis. The milling cutter 2 and the spindle body 1 are detachably connected by existing technology, which facilitates the replacement of different milling cutters 2.

[0050] The spindle body 1 has a laser penetration hole for accommodating the laser. The bottom of the milling cutter bar 2 is equipped with a cutting tool 4 for milling operations. The cutting tool 4 is a general-purpose milling cutting tool, which is easy to replace after wear. The installation of the cutting tool 4 refers to the existing technology. The cutting tool 4 can be installed according to the milling requirements, specifically, bottom milling, side milling, or simultaneous bottom and side milling.

[0051] An optical fiber 3 is installed inside the milling cutter shank 2, with the receiving end for receiving laser light located at the head of the milling cutter shank 2 and the irradiation end for irradiating the workpiece extending to the bottom of the milling cutter shank 2. The optical fiber 3 can be installed using an embedded method. The receiving end of the optical fiber 3 is connected to the laser penetration hole to form a light transmission path. The irradiation position of the laser transmitted through the optical fiber 3 is located on the movement path of the cutting edge when the blade 4 rotates with the milling cutter shank 2. That is, the irradiation position of the laser is located on the rotation path of the cutting edge during the rotation of the blade 4. During bottom milling, the irradiation end of the optical fiber 3 is located on the circumferential surface of the milling cutter shank 2. During side milling, the irradiation end of the optical fiber 3 is located on the circumferential surface of the milling cutter shank 2. During simultaneous bottom and side milling, there are at least two optical fibers 3, located on the bottom end face and the circumferential surface of the milling cutter shank 2, respectively.

[0052] The number of optical fibers 3 can be one, specifically, as shown in the example. Figure 6 and 7 As shown, at this time, the receiving end of the optical fiber 3 is located at the center of the head end face of the milling cutter shank 2, and the irradiation end of the optical fiber 3 can be located on the circumferential surface or the bottom end face of the milling cutter shank 2. The irradiation end of the optical fiber 3 corresponds to the laser penetration hole, that is, the laser can reach the irradiation end of the optical fiber 3 through the laser penetration hole and the light transmission path of the optical fiber 3. The irradiation end of the optical fiber 3 emits laser light to irradiate the surface of the workpiece.

[0053] The laser irradiation position transmitted by the optical fiber 3 is located on the movement path of the cutting edge when the blade 4 rotates with the milling cutter bar 2. That is, after laser irradiation, the time t for the cutting edge of the blade 4 to enter the irradiation position is very short. Since the movement path of the cutting edge passes through the laser irradiation position during rotation, the laser irradiation and milling operation positions highly overlap in space. Moreover, no complicated path control method is required, making it simple to use and enabling timely milling after laser heating.

[0054] When the angle between blade 4 and the laser irradiation position is 180°, the calculation method for the time t when the blade edge of blade 4 enters the irradiation position after laser irradiation is as follows: n represents the rotational speed. Taking the spindle body at 10,000 rpm as an example, after laser irradiation, the time t for the cutting edge of blade 4 to enter the irradiation position is 0.003 s.

[0055] Specifically, the spindle body 1 is rotatably connected to the spindle base plate 6, which has multiple arrayed mounting holes. The laser emitter 5 is detachably installed in some of the mounting holes of the spindle base plate 6. By adjusting the installation position of the laser emitter 5, it can be adjusted up, down, left, and right within a large range to adapt to the focal length requirements.

[0056] Specifically, the spindle body 1 is connected to the output shaft of the power motor 7 via a synchronous belt drive assembly 8 to drive the spindle body 1 to rotate around its own axis; the power motor 7 is mounted on the spindle base plate 6 via a motor bracket 71. The specific structure of the synchronous belt drive assembly 8 can refer to the prior art. The spindle body 1 is parallel to the output shaft of the power motor 7. The power motor 7 is a speed-regulating motor that can control the speed of the spindle body 1.

[0057] Specifically, a focal positioning ring 21 can also be provided on the milling cutter shank 2. The focal positioning ring 21 is coaxially sleeved on the outer circumferential surface of the milling cutter shank 2. The focal positioning ring 21 is provided so that the exposed length is fixed after different milling cutters are installed, that is, there is no need to readjust the focal length of the laser after changing the milling cutter.

[0058] Example 2

[0059] like Figure 3-5 As shown, the difference between Embodiment 2 and Embodiment 1 is that there are multiple optical fibers 3, and the receiving ends of the multiple optical fibers 3 surround the central axis of the milling cutter shank 2; the laser penetration holes correspond one-to-one with the receiving ends of the optical fibers 3, that is, there are also multiple laser penetration holes and they surround the axis of the main shaft body 1; the irradiation ends of the optical fibers 3 are located on the circumferential surface or end face of the milling cutter shank 2, and the multiple optical fibers 3 can all be located on the circumferential surface of the milling cutter shank 2, or all be located on the end face of the milling cutter shank 2, that is, they can be adapted to the milling cutter blade 4 to mill the bottom surface or the side surface; of course, the multiple optical fibers 3 can also be partially located on the circumferential surface of the milling cutter shank 2, and partially located on the circumferential surface of the milling cutter shank 2, so as to adapt to the simultaneous milling of the bottom surface and the side surface of the milling cutter blade 4.

[0060] Furthermore, when there are multiple irradiation ends of the optical fibers 3 on the end face of the milling cutter 2, the irradiation ends of all the optical fibers 3 extending to the end face of the milling cutter 2 are arranged along a first straight line array. The first straight line is the radius of the milling cutter 2, and the angle between the first straight line and the blade 4 can be any angle. Optionally, the angle between the first straight line and the blade 4 can be 10°, 30°, 60°, 90°, or 180°. When there are multiple irradiation ends of the optical fibers 3 on the circumferential surface of the milling cutter 2, the irradiation ends of all the optical fibers 3 extending to the circumferential surface of the milling cutter 2 are arranged along a second straight line array. The second straight line is perpendicular to the end face of the milling cutter 2. When there are multiple irradiation ends of the optical fibers 3 extending to both the circumferential surface and the end face of the milling cutter 2, the first straight line and the second straight line can be connected end to end, or they can be staggered. When the irradiation ends of all the optical fibers 3 extending to the circumferential surface of the milling cutter 2 are arranged along the second straight line array, it can be applied to milling operations of different depths.

[0061] The number of optical fibers 3 is usually 2, 4, or 6, and the specific distribution is as follows: Figure 8 and 9 As shown.

[0062] Example 3

[0063] like Figure 1 As shown, the difference between Embodiment 3 and Embodiment 2 is that Embodiment 3 also includes a laser emitting head 5. Multiple laser-piercing holes are arranged in a ring around the axis of the main spindle body 1. The laser emitting head 5 faces a point in the ring distribution path of all the laser-piercing holes. When the main spindle body 1 rotates around its own axis, the laser emitting head 5 and the laser-piercing holes sequentially face each other. That is, in its initial position, the laser emitting head 5 can face one of the laser-piercing holes. During one revolution of the main spindle body 1, the laser emitting head 5 can change the corresponding laser-piercing hole. Of course, in its initial position, the laser emitting head 5 can also face the end face of the milling spindle. During rotation, it can sequentially face all the laser-piercing holes. The laser emitting head 5 faces the laser-piercing holes, and the laser-piercing holes correspond to the optical fiber 3, thus forming a complete optical path.

[0064] Furthermore, the laser emitting head 5 emits laser light in the form of pulses, and the laser emission signal of the laser emitting head 5 can be adjusted according to the usage of the optical fiber 3 to adapt to the current milling condition. Specifically, depending on the current milling condition, some or all of the optical fibers 3 can be used, and the laser emission signal of the laser emitting head 5 can be adjusted according to the usage of the optical fiber 3. Specifically, different milling requirements include different depths for bottom milling only, side milling, simultaneous bottom and side milling, and single-layer milling.

[0065] Furthermore, a speed measuring wheel 9 is installed at the end of the spindle body 1 away from the milling cutter bar 2; a detection block 10 is provided on the speed measuring wheel 9, and the detection block 10 can be set to a different color than the speed measuring wheel 9. The spindle body 1 is rotatably connected to the spindle base plate 6; a photoelectric sensor 11 is also provided on the spindle base plate 6; the photoelectric sensor 11 works in conjunction with the detection block 10 to detect the rotational speed of the spindle body 1. The speed measuring wheel 9 rotates synchronously with the spindle body 1. The specific method by which the photoelectric sensor 11 detects the rotational speed of the spindle body 1 through the detection block 10 can refer to the prior art; by detecting the rotational speed of the spindle body 1 in real time, the laser emission signal of the laser emitter 5 is adjusted, thereby making the laser emission more accurate.

[0066] Example 4

[0067] like Figure 10-12 As shown, the difference between Embodiment 4 and Embodiment 3 is that, while retaining the features of Embodiment 3, it provides a laser control method for a laser-assisted milling spindle, including the following steps:

[0068] S1: Measure the rotational speed ω of the spindle body 1 in real time to determine the laser emission period T of the laser emitter head 5.

[0069]

[0070] S2: Based on the number of laser penetration holes i and the emission period T of the laser emitter head 5, determine the time interval t between two adjacent laser pulses in the original state. r The original state refers to the state in which all optical fibers 3 are in use;

[0071] The time interval t between two adjacent laser pulses in the original state r for:

[0072]

[0073] S3: Determine the pulse width t of a single laser pulse based on the diameter D of the optical fiber 3 and the distance L from the center of the optical fiber 3 to the axis of the milling cutter shank 2. u ;

[0074] The pulse width t of the single laser pulse u for:

[0075]

[0076] Where ε is the loss prevention experience duration.

[0077] The purpose of setting the loss prevention experience time is to avoid laser damage to the milling cutter shank.

[0078] S4: Based on the position of the optical fiber 3 used, skip the laser pulses corresponding to the positions of the unused optical fiber 3, and retain the laser pulses corresponding to the optical fiber 3 used;

[0079] like Figure 11 The diagram shows the waveform of the laser emission signal when the second laser pulse is skipped and the other three laser pulses are retained.

[0080] S5: Based on the position of the retained laser pulse and the time interval t between two adjacent laser pulses in the original state. r Determine the time interval t between two adjacent retained laser pulses. d .

[0081] The time interval t between two adjacent retained laser pulses d It is the time interval t between two adjacent laser pulses in the original state. r The integer multiple of t, that is, when all optical fibers 3 are used, the time interval t between two adjacent laser pulses in the original state. r and the time interval t between two adjacent retained laser pulses d Equal; such as Figure 11 As shown, when the second optical fiber 3 is not used, the laser pulses corresponding to the original first optical fiber and the third optical fiber are retained, and the time interval t between the laser pulses corresponding to the first and third optical fibers is... d The time interval t between two adjacent laser pulses in the original state r 2 times.

[0082] S6: Based on the delay time t0 from receiving the command to issuing the action of the laser transmitter 5, and the pulse width t of a single laser pulse... u and the time interval t between two adjacent retained laser pulses d To control the laser emission.

[0083] Example 5

[0084] A laser-assisted milling device includes a worktable and a laser-assisted milling spindle as described in any one of Embodiments 1 to 3. The worktable is used to place the workpiece to be processed and to move the workpiece in the X, Y, and Z directions. The laser-assisted milling spindle is directly opposite the worktable and the two are used in conjunction. The structure and manner in which the worktable moves the workpiece in the X, Y, and Z directions are in accordance with the prior art. After the laser-assisted milling spindle is used in conjunction with the worktable, the milling of the workpiece can be realized.

[0085] The various embodiments in this specification are described in a progressive manner. Each embodiment focuses on the differences from other embodiments. The same or similar parts between the various embodiments can be referred to each other.

[0086] The above are merely preferred embodiments of the present invention. The scope of protection of the present invention is not limited to the above embodiments. All technical solutions falling within the scope of the present invention's concept are within the scope of protection of the present invention. It should be noted that for those skilled in the art, any improvements and modifications made without departing from the principles of the present invention should be considered within the scope of protection of the present invention.

Claims

1. A laser control method for a laser-assisted milling spindle, characterized in that, The laser-assisted milling spindle includes a spindle body (1), a milling cutter bar (2), and an optical fiber (3); the milling cutter bar (2) and the spindle body (1) are coaxially connected end to end and can rotate around their own axis; a laser penetration hole is provided in the spindle body (1) to accommodate the passage of the laser; a cutting blade (4) for milling operation is installed at the bottom of the milling cutter bar (2); the optical fiber (3) is installed in the milling cutter bar (2), and the receiving end for receiving the laser is located at the head of the milling cutter bar (2), while the irradiation end for irradiating the workpiece extends to the bottom of the milling cutter bar (2); the receiving end of the optical fiber (3) is connected to the laser penetration hole to form a light transmission path; the irradiation position of the laser transmitted by the optical fiber (3) is located on the movement path of the cutting edge when the cutting blade (4) rotates with the milling cutter bar (2); The laser control method includes the following steps: The rotational speed ω of the spindle body (1) is measured in real time to determine the laser emission period T; Based on the number of laser-perforated holes Given the laser emission period T, determine the time interval t between two adjacent laser pulses in the original state. r The original state is when all optical fibers (3) are in use; The pulse width t of a single laser pulse is determined based on the diameter D of the optical fiber (3) and the distance L from the center of the optical fiber (3) to the axis of the milling cutter bar (2). u ; Depending on the position of the optical fiber (3) used, skip the laser pulses corresponding to the position of the unused optical fiber (3) and retain the laser pulses corresponding to the optical fiber (3) used; Based on the position of the retained laser pulse and the time interval t between two adjacent laser pulses in the original state r Determine the time interval t between two adjacent retained laser pulses. d ; Based on the delay time from receiving the command to emitting the laser t 0. The pulse width t of a single laser pulse u and the time interval t between two adjacent retained laser pulses d To control the laser emission.

2. The laser control method for a laser-assisted milling spindle according to claim 1, characterized in that, There are multiple optical fibers (3), and the receiving ends of the multiple optical fibers (3) surround the central axis of the milling cutter bar (2); the laser penetration holes correspond one-to-one with the receiving ends of the optical fibers (3); the irradiation ends of the optical fibers (3) are located on the circumferential surface and / or end face of the milling cutter bar (2).

3. The laser control method for a laser-assisted milling spindle according to claim 2, characterized in that, When there are multiple irradiation ends of optical fibers (3) on the end face of the milling cutter bar (2), the irradiation ends of all optical fibers (3) extending to the end face of the milling cutter bar (2) are arranged along a first straight line array, where the first straight line is the radius of the milling cutter bar (2). When there are multiple irradiation ends of optical fibers (3) on the circumferential surface of the milling cutter bar (2), the irradiation ends of all optical fibers (3) extending to the circumferential surface of the milling cutter bar (2) are arranged along a second straight line array, and the second straight line is perpendicular to the end face of the milling cutter bar (2).

4. The laser control method for a laser-assisted milling spindle according to claim 2, characterized in that, It also includes a laser emitting head (5), and multiple laser penetration holes are arranged in a ring around the axis of the main shaft body (1); the laser emitting head (5) is facing a point in the distribution path of all laser penetration holes; when the main shaft body (1) rotates on its own axis, the laser emitting head (5) and the laser penetration holes are in turn facing each other.

5. The laser control method for a laser-assisted milling spindle according to claim 4, characterized in that, The laser emitter (5) emits laser in the form of square wave pulses. The laser emission signal of the laser emitter (5) can be adjusted according to the use of the optical fiber (3) to adapt to the current milling conditions.

6. The laser control method for a laser-assisted milling spindle according to claim 4, characterized in that, The spindle body (1) is rotatably connected to the spindle base plate (6), and the spindle base plate (6) is provided with a plurality of arrayed mounting holes; the laser emitter (5) is detachably installed in part of the mounting holes of the spindle base plate (6).

7. The laser control method for a laser-assisted milling spindle according to claim 1, characterized in that, The main spindle body (1) is connected to the output shaft of the power motor (7) via a synchronous belt drive assembly (8) to drive the main spindle body (1) to rotate around its own axis; the power motor (7) is mounted on the main spindle base plate (6) via a motor bracket (71); A speed measuring wheel (9) is installed at the end of the spindle body (1) away from the milling cutter bar (2); a detection block (10) is provided on the speed measuring wheel (9); the spindle body (1) is rotatably connected to the spindle base plate (6); a photoelectric sensor (11) is also provided on the spindle base plate (6); the photoelectric sensor (11) is used in conjunction with the detection block (10) to detect the rotational speed of the spindle body (1).

8. The laser control method for a laser-assisted milling spindle according to claim 1, characterized in that, The time interval t between two adjacent laser pulses in the original state r for: ； The pulse width t of the single laser pulse u for: ； in, For loss prevention experience duration.

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